Boiler flue gas waste heat recycling system

Abstract

A boiler flue gas waste heat recycling system is characterized by comprising a boiler, a bypass economizer, an air preheater, a dust remover, a desulfurizing tower, a chimney, an air feeder, a primary air fan and a coal mill. A boiler flue gas outlet is communicated with a flue gas inlet of the air preheater and a flue gas inlet of the bypass economizer; an outlet of the blower is communicated with an air supply inlet of the air preheater; the air preheater air supply outlet is communicated with the boiler air supply inlet; an outlet of the primary fan is simultaneously communicated with a primary air inlet of the air preheater and a primary air inlet of the coal mill; a primary air outlet of the air preheater is communicated with a primary air inlet of the coal mill; an air powder outlet of the coal mill is communicated with a boiler coal inlet; a bypass air channel is arranged between an air supply channel communicated with an air supply outlet of the air preheater and a primary air channel communicated with a primary air outlet of the air preheater. The bypass air channel is provided with a bypass baffle or / and a bypass fan. By means of the system, efficient recovery and efficient utilization of flue gas waste heat can be achieved.

Description

Technical Field

[0001] The utility model relates to a boiler flue gas waste heat recovery and utilization system. Background Art

[0002] In a conventional boiler system, coal and air (oxygen) are burned in the boiler to form flue gas that is discharged from the furnace. It passes through the air preheater, dust collector, induced draft fan, desulfurization tower, and then is discharged into the chimney and into the atmosphere. The air preheater is used to use the waste heat of the flue gas from the furnace to heat the supply air and primary air. The supply air enters the furnace directly, and the primary air is sent to the pulverizer to dry the coal and transport the coal after being ground by the pulverizer. The pulverizer is used to grind the coal into powder to improve the combustion efficiency of the boiler. Since the humidity of the coal will change, the amount of primary air required to dry the coal will also change. Generally, the primary air heating capacity of the air preheater is designed according to the design boundary of the relatively wet coal. When the coal is relatively dry, the primary air heating capacity of the air preheater will be wasted, which is not conducive to fully utilizing the established heat exchange capacity of the air preheater, fully recovering the waste heat of the flue gas, and reducing the exhaust loss of the air preheater. On the contrary, if the primary air heating capacity of the air preheater is designed according to the design boundary of drier coal, when the coal is wetter, the primary air heating capacity of the air preheater will be insufficient, affecting the drying and grinding of coal by the pulverizer, and thus affecting the output of the unit. Utility Model Content

[0003] In order to solve the above problems, the utility model provides a boiler flue gas waste heat recovery and utilization system, which is characterized by comprising: a boiler, a bypass economizer, an air preheater, a dust collector, a desulfurization tower, a chimney, a blower, a primary fan, and a coal mill; wherein,

[0004] The boiler is provided with a coal inlet, a boiler air supply inlet, and a boiler smoke outlet;

[0005] The bypass economizer is provided with a bypass economizer flue gas inlet, a bypass economizer flue gas outlet, a bypass economizer working fluid water inlet, and a bypass economizer working fluid water outlet;

[0006] The air preheater is provided with an air preheater smoke inlet, an air preheater smoke outlet, an air preheater air supply inlet, an air preheater air supply outlet, an air preheater primary air inlet, and an air preheater primary air outlet;

[0007] The dust collector is provided with a dust collector inlet and a dust collector outlet;

[0008] The desulfurization tower is provided with a desulfurization tower flue gas inlet and a desulfurization tower flue gas outlet;

[0009] The blower is provided with a blower inlet and a blower outlet;

[0010] The primary fan is provided with a primary fan inlet and a primary fan outlet;

[0011] The coal mill is provided with a coal inlet, a primary air inlet and an air-powder outlet;

[0012] The boiler flue gas outlet is directly or indirectly connected to the air preheater flue gas inlet and the bypass economizer flue gas inlet; the air preheater flue gas outlet and the bypass economizer flue gas outlet are both directly or indirectly connected to the dust collector inlet; the dust collector outlet is directly or indirectly connected to the desulfurization tower flue gas inlet; the desulfurization tower flue gas outlet is directly or indirectly connected to the chimney;

[0013] The working medium water outlet of the bypass economizer is connected to the next process link or heat user;

[0014] The blower outlet is directly or indirectly connected to the air supply inlet of the air preheater; the air supply outlet of the air preheater is directly or indirectly connected to the air supply inlet of the boiler;

[0015] The primary air fan outlet is directly or indirectly connected to the primary air inlet of the air preheater and the primary air inlet of the coal mill; the primary air outlet of the air preheater is directly or indirectly connected to the primary air inlet of the coal mill; the pulverized air outlet of the coal mill is directly or indirectly connected to the coal inlet of the boiler;

[0016] A bypass air duct is provided between the air supply channel directly or indirectly connected to the air supply outlet of the air preheater and the primary air channel directly or indirectly connected to the primary air outlet of the air preheater; the bypass air duct is provided with a bypass baffle and / or a bypass fan;

[0017] The number of the primary fan is one or more; the number of the blower is one or more; the number of the coal mill is one or more; the number of the air preheater is one or more;

[0018] Optionally, an induced draft fan is connected in series on the flue gas channel between the dust collector outlet and the desulfurization tower;

[0019] Optionally, the bypass economizer includes a first-stage bypass heat exchange module and a second-stage bypass heat exchange module connected in series; the first-stage bypass heat exchange module is provided with a bypass economizer flue gas inlet, a first-stage bypass heat exchange module flue gas outlet, a first-stage bypass heat exchange module working fluid water inlet, and a bypass economizer working fluid water outlet; the second-stage bypass heat exchange module is provided with a second-stage bypass heat exchange module flue gas inlet, a bypass economizer flue gas outlet, a bypass economizer working fluid water inlet, and a second-stage bypass heat exchange module working fluid water outlet; the first-stage bypass heat exchange module flue gas outlet is directly or indirectly connected to the second-stage bypass heat exchange module flue gas inlet, and the second-stage bypass heat exchange module working fluid water outlet is directly or indirectly connected to the first-stage bypass heat exchange module working fluid water inlet; optionally, the second-stage bypass heat exchange module working fluid water outlet is directly or indirectly connected to the first-stage bypass heat exchange module working fluid water inlet through the first bypass deaerator and / or the first bypass feed water pump;

[0020] Optionally, a first desulfurization tower is connected in series to the flue gas outlet of the desulfurization tower or a flue directly or indirectly connected to the flue gas outlet of the desulfurization tower;

[0021] Optionally, a bypass feed water pump and / or a bypass deaerator and / or a buffer water tank is provided on the working water channel directly or indirectly connected to the working water inlet of the bypass economizer.

[0022] Preferably, the boiler flue gas waste heat recovery and utilization system is further provided with a flue heat exchanger, a supply air heater, and a primary air heater;

[0023] The flue heat exchanger is provided with a flue heat exchanger flue gas inlet, a flue heat exchanger flue gas outlet, a flue heat exchanger air supply heat medium water inlet, a flue heat exchanger air supply heat medium water outlet, a flue heat exchanger primary air heat medium water inlet, and a flue heat exchanger primary air heat medium water outlet; the air supply heater is provided with an air supply heater air inlet, an air supply heater air outlet, an air supply heater heat medium water inlet, and an air supply heater heat medium water outlet; the primary air heater is provided with a primary air heater primary air inlet, a primary air heater primary air outlet, a primary air heater heat medium water inlet, and a primary air heater heat medium water outlet;

[0024] The air supply channel of the air supply heater is connected in series to the air supply channel between the air supply fan outlet and the air supply inlet of the air preheater, the air supply inlet of the air supply heater is directly or indirectly connected to the air supply fan outlet, and the air supply outlet of the air supply heater is directly or indirectly connected to the air supply inlet of the air preheater;

[0025] The primary air channel of the primary air heater is connected in series to the primary air channel directly or indirectly connected to the primary fan outlet, the primary air inlet of the primary air heater is directly or indirectly connected to the primary fan outlet, and the primary outlet of the primary air heater is directly or indirectly connected to the primary air inlet of the air preheater and the primary air inlet of the coal mill at the same time;

[0026] The heat medium water outlet of the flue heat exchanger for air supply is directly or indirectly connected to the heat medium water inlet of the air supply heater, and the heat medium water outlet of the air supply heater is directly or indirectly connected to the heat medium water inlet of the flue heat exchanger for air supply; the heat medium water outlet of the flue heat exchanger for primary air is directly or indirectly connected to the heat medium water inlet of the primary air heater, and the heat medium water outlet of the primary air heater is directly or indirectly connected to the heat medium water inlet of the flue heat exchanger for primary air;

[0027] The flue gas channel of the flue heat exchanger is connected in series on the flue gas channel between the flue gas outlet of the air preheater and the inlet of the dust collector, the flue gas inlet of the flue heat exchanger is directly or indirectly connected to the flue gas outlet of the air preheater, the flue gas outlet of the flue heat exchanger is directly or indirectly connected to the inlet of the dust collector, the flue gas outlet of the bypass economizer is connected to the flue gas channel between the flue gas outlet of the air preheater and the flue gas inlet of the flue heat exchanger, or the flue gas outlet of the bypass economizer is connected to the flue gas channel between the flue gas outlet of the flue heat exchanger and the inlet of the dust collector; or, the flue gas channel of the flue heat exchanger is connected in series on the flue gas channel between the dust collector and the flue gas inlet of the desulfurization tower, the flue gas inlet of the flue heat exchanger is directly or indirectly connected to the dust collector outlet, and the flue gas outlet of the flue heat exchanger is directly or indirectly connected to the flue gas inlet of the desulfurization tower;

[0028] Optionally, a heat medium water circulation pump is connected in series to the heat medium water channel directly or indirectly connected to the heat medium water inlet of the flue heat exchanger or the heat medium water outlet of the flue heat exchanger.

[0029] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the flue heat exchanger air supply heat medium water inlet and the flue heat exchanger primary air heat medium water inlet are combined into the flue heat exchanger heat medium water inlet, the flue heat exchanger air supply heat medium water outlet and the flue heat exchanger primary air heat medium water outlet are combined into the flue heat exchanger heat medium water outlet, the flue heat exchanger heat medium water outlet is directly or indirectly connected to the air supply heater heat medium water inlet and the primary air heater heat medium water inlet at the same time, and the air supply heater heat medium water outlet and the primary air heater heat medium water outlet are both directly or indirectly connected to the flue heat exchanger heat medium water inlet;

[0030] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the flue heat exchanger includes a primary air flue heat exchanger and a supply air flue heat exchanger; the primary air flue heat exchanger is provided with a primary air flue heat exchanger flue gas inlet, a primary air flue heat exchanger flue gas outlet, a flue heat exchanger primary air heat medium water inlet, and a flue heat exchanger primary air heat medium water outlet; the supply air flue heat exchanger is provided with a supply air flue heat exchanger flue gas inlet, a supply air flue heat exchanger flue gas outlet, a flue heat exchanger supply air heat medium water inlet, and a flue heat exchanger supply air heat medium water outlet; the primary air flue heat exchanger flue gas inlet and the supply air flue heat exchanger flue gas inlet together constitute the flue heat exchanger flue gas inlet; the primary air flue heat exchanger smoke gas outlet and the supply air flue heat exchanger smoke gas outlet together constitute the flue heat exchanger smoke gas outlet.

[0031] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the flue heat exchanger, the primary air flue heat exchanger, and the supply air flue heat exchanger are all the heating sections (evaporation sections) of the separate heat pipe heat exchanger, and the primary air heater and the supply air heater are all the heat release sections (condensation sections) of the separate heat pipe heat exchanger.

[0032] Preferably, the boiler flue gas waste heat recovery and utilization system is further provided with a low-temperature air preheater; the low-temperature air preheater is provided with a low-temperature air preheater flue gas inlet, a low-temperature air preheater flue gas outlet, a low-temperature air preheater air supply inlet, a low-temperature air preheater air supply outlet, a low-temperature air preheater primary air inlet, and a low-temperature air preheater primary air outlet;

[0033] The low-temperature air preheater air supply inlet is directly or indirectly connected to the blower outlet; the low-temperature air preheater air supply outlet is directly or indirectly connected to the air preheater air supply inlet; the low-temperature air preheater primary air inlet is directly or indirectly connected to the primary blower outlet; the low-temperature air preheater primary air outlet is directly or indirectly connected to the air preheater primary air inlet and the coal mill primary air inlet at the same time;

[0034] The low-temperature air preheater flue gas channel is connected in series on the flue gas channel between the air preheater flue gas outlet and the dust collector inlet, and the low-temperature air preheater flue gas inlet is directly or indirectly connected to the air preheater flue gas outlet; the low-temperature air preheater flue gas outlet is directly or indirectly connected to the dust collector inlet, and the bypass economizer flue gas outlet is connected to the flue gas channel between the air preheater flue gas outlet and the low-temperature air preheater flue gas inlet, or the bypass economizer flue gas outlet is connected to the flue gas channel between the low-temperature air preheater flue gas outlet and the dust collector inlet.

[0035] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the low-temperature air preheater includes a primary air low-temperature air preheater and a supply air low-temperature air preheater; the primary air low-temperature air preheater is provided with a primary air low-temperature air preheater flue gas inlet, a primary air low-temperature air preheater flue gas outlet, a low-temperature air preheater primary air inlet, and a low-temperature air preheater primary air outlet; the supply air low-temperature air preheater is provided with a supply air low-temperature air preheater flue gas inlet, a supply air low-temperature air preheater flue gas outlet, a low-temperature air preheater supply air inlet, and a low-temperature air preheater supply air outlet; the primary air low-temperature air preheater flue gas inlet and the supply air low-temperature air preheater flue gas inlet are both connected to the low-temperature air preheater flue gas inlet; the primary air low-temperature air preheater flue gas outlet and the supply air low-temperature air preheater flue gas outlet are both connected to the low-temperature preheater flue gas outlet.

[0036] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the low-temperature air preheater may include one or more heat exchange modules.

[0037] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the low-temperature air preheater, the primary air low-temperature air preheater, and the supply air low-temperature air preheater can each be a heat pipe heat exchanger.

[0038] Preferably, in the above boiler flue gas waste heat recovery and utilization system, the low-temperature air preheater includes one or more supply air rotary cage heat exchangers and one or more primary air rotary cage heat exchangers;

[0039] The air supply cage heat exchanger comprises an air supply cage heat exchanger shell; a rotatable air supply cage heat exchanger core is provided in the air supply cage heat exchanger shell; the air supply cage heat exchanger core comprises a front end plate of the air supply cage heat exchanger core, a rear end plate of the air supply cage heat exchanger core, and a plurality of air supply cage heat exchanger core heat exchange tubes; the front end plate of the air supply cage heat exchanger core is provided with a plurality of through holes in the front end plate of the air supply cage heat exchanger core, and the rear end plate of the air supply cage heat exchanger core is correspondingly provided with a plurality of through holes in the rear end plate of the air supply cage heat exchanger core; the two ends of each of the heat exchange tubes of the air supply cage heat exchanger core are respectively connected to the through holes of the front end plate of the air supply cage heat exchanger core and the corresponding through holes of the rear end plate of the air supply cage heat exchanger core; the air supply cage heat exchanger core is provided with a plurality of through holes in the rear end plate of the air supply cage heat exchanger core The line connecting the center of the front end plate of the heat exchanger core and the center of the rear end plate of the air supply cage heat exchanger core is the center line, and the air supply cage heat exchanger core can rotate with the center line as the axis of the air supply cage heat exchanger core; the flow channels in the heat exchange tubes of all the air supply cage heat exchanger cores constitute the air supply channel of the air supply cage heat exchanger core; the flow channel formed by the front end plate of the air supply cage heat exchanger core, the rear end plate of the air supply cage heat exchanger core, the outer surface of the heat exchange tubes of each of the air supply cage heat exchanger cores and the air supply cage heat exchanger shell is the air supply cage heat exchanger core smoke channel of the air supply cage heat exchanger; a side surface of the air supply cage heat exchanger shell at the smoke channel of the air supply cage heat exchanger core is provided with a smoke inlet of the air supply cage heat exchanger, The opposite side of the above-mentioned side of the air supply cage heat exchanger shell at the smoke channel of the air supply cage heat exchanger core is provided with an air supply cage heat exchanger smoke outlet; an air supply cage heat exchanger air inlet bellows is provided between the front end plate of the air supply cage heat exchanger core and the front end portion of the air supply cage heat exchanger shell; the air supply cage heat exchanger shell at the air supply inlet bellows is provided with an air supply cage heat exchanger air inlet; an air supply cage heat exchanger air outlet bellows is provided between the rear end portion of the air supply cage heat exchanger shell and the rear end plate of the air supply cage heat exchanger core, and the air supply cage heat exchanger shell at the air supply outlet bellows is provided with an air supply cage heat exchanger air outlet The air supply channel is directly or indirectly connected to the air supply inlet of the air supply cage heat exchanger through the front end plate of the air supply cage heat exchanger core, the air supply inlet bellows of the air supply cage heat exchanger, and the air supply channel of the air supply cage heat exchanger core is directly or indirectly connected to the air supply outlet of the air supply cage heat exchanger through the rear end plate of the air supply cage heat exchanger core, the air supply outlet bellows of the air supply cage heat exchanger; or, an air supply inlet bellows and an air supply outlet bellows isolated from each other are provided between the front end plate of the air supply cage heat exchanger core and the front end portion of the air supply cage heat exchanger shell; an air supply outlet is provided on the air supply cage heat exchanger shell at the air supply outlet bellows of the air supply cage heat exchanger;An air supply inlet is provided on the shell of the air supply cage heat exchanger at the air supply inlet bellows of the air supply cage heat exchanger; an air supply cage heat exchanger turning bellows is provided between the rear end plate of the air supply cage heat exchanger core and the rear end portion of the air supply cage heat exchanger shell; the flow channel in the heat exchange pipe of the air supply cage heat exchanger core connected to the through hole of the front end plate of the air supply cage heat exchanger core in the air supply inlet bellows of the air supply cage heat exchanger constitutes an air inlet channel of the air supply cage heat exchanger core; the flow channel in the heat exchange pipe of the air supply cage heat exchanger core connected to the through hole of the front end plate of the air supply cage heat exchanger core in the air supply outlet bellows constitutes an air return channel of the air supply cage heat exchanger core duct; the air inlet channel of the air supply cage heat exchanger core and the air return channel of the air supply cage heat exchanger core constitute the air supply channel of the air supply cage heat exchanger core; the air supply cage heat exchanger air inlet, the air supply cage heat exchanger air inlet bellows, the air supply cage heat exchanger core air inlet channel, the air supply cage heat exchanger turning bellows, the air supply cage heat exchanger core return channel, the air supply cage heat exchanger air outlet bellows, and the air supply cage heat exchanger air outlet are connected in sequence; all of the air supply cage heat exchanger air inlets together constitute the air supply inlet of the low-temperature air preheater; all of the air supply cage heat exchanger air outlets together constitute the air supply outlet of the low-temperature air preheater;

[0040] The primary air rotary cage heat exchanger includes a primary air rotary cage heat exchanger shell; a rotatable primary air rotary cage heat exchanger core is provided in the primary air rotary cage heat exchanger shell; the primary air rotary cage heat exchanger core includes a primary air rotary cage heat exchanger core front end plate, a primary air rotary cage heat exchanger core rear end plate, and a plurality of primary air rotary cage heat exchanger core heat exchange tubes; the primary air rotary cage heat exchanger core front end plate is provided with a plurality of primary air rotary cage heat exchanger core front end plate through holes, and the primary air rotary cage heat exchanger core rear end plate is correspondingly provided with a plurality of primary air rotary cage heat exchanger core rear end plate through holes; both ends of each of the primary air rotary cage heat exchanger core heat exchange tubes are respectively aligned with the primary air rotary cage heat exchanger core front end plate through hole and the corresponding primary air rotary cage heat exchanger core rear end plate through hole Connection; with the center line of the center of the front end plate of the primary air rotary cage heat exchanger core and the center line of the rear end plate of the primary air rotary cage heat exchanger core as the center line, the primary air rotary cage heat exchanger core can rotate with the center line as the axis of the primary air rotary cage heat exchanger core; the flow channels in the heat exchange tubes of all the primary air rotary cage heat exchanger cores constitute the primary air channel of the primary air rotary cage heat exchanger core; the flow channel formed between the front end plate of the primary air rotary cage heat exchanger core, the rear end plate of the primary air rotary cage heat exchanger core, the outer surface of the heat exchange tubes of each primary air rotary cage heat exchanger core and the outer shell of the primary air rotary cage heat exchanger is the primary air rotary cage heat exchanger core flue gas channel of the primary air rotary cage heat exchanger; the primary air rotary cage heat exchanger at the flue gas channel of the primary air rotary cage heat exchanger core A primary air rotary cage heat exchanger smoke inlet is provided on one side of the shell of the primary air rotary cage heat exchanger, and a primary air rotary cage heat exchanger smoke outlet is provided on the opposite side of the above-mentioned one side of the shell of the primary air rotary cage heat exchanger at the smoke channel of the primary air rotary cage heat exchanger core; a primary air rotary cage heat exchanger primary air inlet bellows is provided between the front end plate of the primary air rotary cage heat exchanger core and the front end of the shell of the primary air rotary cage heat exchanger; a primary air rotary cage heat exchanger primary air inlet bellows is provided on the shell of the primary air rotary cage heat exchanger at the primary air inlet bellows; a primary air rotary cage heat exchanger primary air outlet bellows is provided between the rear end portion of the primary air rotary cage heat exchanger shell and the rear end plate of the primary air rotary cage heat exchanger core, and the primary air outlet bellows at the primary air rotary cage heat exchanger The secondary air rotary cage heat exchanger shell is provided with a primary air outlet of a primary air rotary cage heat exchanger, and the core primary air channel is directly or indirectly connected to the primary air inlet of the primary air rotary cage heat exchanger through the front end plate of the primary air rotary cage heat exchanger core and the primary air inlet bellows of the primary air rotary cage heat exchanger in sequence, and the primary air channel of the primary air rotary cage heat exchanger core is directly or indirectly connected to the primary air outlet of the primary air rotary cage heat exchanger through the rear end plate of the primary air rotary cage heat exchanger core and the primary air outlet bellows of the primary air rotary cage heat exchanger in sequence; or, a primary air inlet bellows and a primary air outlet bellows of the primary air rotary cage heat exchanger isolated from each other are provided between the front end plate of the primary air rotary cage heat exchanger core and the front end portion of the primary air rotary cage heat exchanger shell;The primary air rotary cage heat exchanger shell is provided with a primary air outlet of the primary air outlet wind box of the primary air rotary cage heat exchanger; the primary air outlet of the primary air outlet wind box of the primary air inlet wind box of the primary air rotary cage heat exchanger shell is provided with a primary air inlet of the primary air rotary cage heat exchanger; a primary air inlet wind box is provided between the rear end plate of the primary air rotary cage heat exchanger core and the rear end of the primary air rotary cage heat exchanger shell; the flow channel in the heat exchange pipe of the primary air rotary cage heat exchanger core connected to the through hole of the front end plate of the primary air rotary cage heat exchanger core in the primary air inlet wind box of the primary air rotary cage heat exchanger constitutes an air inlet channel of the primary air rotary cage heat exchanger core; the primary air rotary cage heat exchanger connected to the through hole of the front end plate of the primary air rotary cage heat exchanger core in the primary air outlet wind box The flow channel in the heat exchange tube of the cage heat exchanger core constitutes a primary air rotary cage heat exchanger core return air channel; the primary air rotary cage heat exchanger core air inlet channel and the primary air rotary cage heat exchanger core return air channel constitute the core primary air channel; the primary air rotary cage heat exchanger primary air inlet bellows, the primary air rotary cage heat exchanger core air inlet channel, the primary air rotary cage heat exchanger turning bellows, the primary air rotary cage heat exchanger core return air channel, the primary air rotary cage heat exchanger primary air outlet bellows, and the primary air rotary cage heat exchanger primary air outlet are connected in sequence; all the primary air rotary cage heat exchanger primary air inlets together constitute the low-temperature air preheater primary air inlet; all the primary air rotary cage heat exchanger primary air outlets together constitute the low-temperature air preheater primary air outlet;

[0041] The flue gas inlets of all the air supply rotary heat exchangers and the flue gas inlets of all the primary air rotary heat exchangers together constitute the flue gas inlet of the low-temperature air preheater; the flue gas outlets of all the air supply rotary heat exchangers and the flue gas outlets of all the primary air rotary heat exchangers together constitute the flue gas outlet of the low-temperature air preheater;

[0042] Optionally, an air supply cage heat exchanger core drive device is also provided; optionally, a primary air cage heat exchanger core drive device is also provided.

[0043] Preferably, in the above-mentioned boiler flue gas waste heat recovery system, the core heat exchange tubes of the air supply cage heat exchanger adopt external fin tubes and / or internal fin tubes; the core heat exchange tubes of the primary air cage heat exchanger adopt external fin tubes and / or internal fin tubes.

[0044] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the low-temperature air preheater includes a supply air low-temperature air preheater and a primary air low-temperature air preheater; the supply air low-temperature air preheater includes one or more supply air rotary heat pipe heat exchangers; or / and, the primary air low-temperature air preheater includes one or more primary air rotary heat pipe heat exchangers;

[0045] The rotary heat pipe heat exchanger includes a heat pipe heat exchanger shell, a heat pipe heat exchanger chamber partition, and a heat pipe heat exchanger core; the heat pipe heat exchanger shell forms a closed heat pipe heat exchanger chamber; the heat pipe heat exchanger chamber partition is arranged in the heat pipe heat exchanger chamber and divides the heat pipe heat exchanger chamber into a heat pipe heat exchanger flue gas channel and a heat pipe heat exchanger air channel isolated from each other; a heat pipe heat exchanger flue gas inlet is opened on one side of the heat pipe heat exchanger shell at the heat pipe heat exchanger flue gas channel, and a heat pipe heat exchanger flue gas inlet is opened on the heat pipe heat exchanger A heat pipe heat exchanger smoke outlet is provided on the other side of the heat pipe heat exchanger shell at the smoke channel; a heat pipe heat exchanger air inlet is provided on one side of the heat pipe heat exchanger shell at the heat pipe heat exchanger air channel, and a heat pipe heat exchanger air outlet is provided on the other side of the heat pipe heat exchanger shell at the heat pipe heat exchanger air channel; a heat pipe heat exchanger core through hole is provided on the heat pipe heat exchanger chamber partition; the heat pipe heat exchanger core includes a plurality of heat pipes and a core partition; the core partition is provided with a hole corresponding to the number of the heat pipes Equal heat pipe through holes; the heat pipes all pass through the heat pipe through holes, and the heat pipes are divided into two sections with the core partition as the boundary; the heat pipes are sealed and connected to the core partition (such as welding or sealing ring connection); the heat pipe heat exchanger core passes through the heat pipe heat exchanger core through holes, and the core partition is tightly fitted with the heat pipe heat exchanger chamber partition; one section of the heat pipe is located in the heat pipe heat exchanger flue gas channel as the heat pipe heating section, and the other section of the heat pipe is located in the heat pipe heat exchanger wind channel as the heat pipe Heat release section; all heat pipe heated sections constitute the heat pipe heat exchanger core heated section; all heat pipe heat release sections constitute the heat pipe heat exchanger core heat release section; a straight line or arc passing through the center or close to the center of the core partition is used as the heat pipe heat exchanger core axis, and the heat pipe heat exchanger core can rotate around the heat pipe heat exchanger core axis; the heat release section of the heat pipe is higher in vertical direction than the heat receiving section of the heat pipe; the heat release section of the heat pipe heat exchanger core is higher in vertical direction than the heat receiving section of the heat pipe;

[0046] Optionally, the rotary heat pipe heat exchanger is further provided with a plurality of first heat pipes; the heat pipe heat exchanger chamber partition is further provided with first heat pipe through holes equal to the number of the first heat pipes; the first heat pipes all pass through the first heat pipe through holes, and the first heat pipes are divided into two sections with the heat pipe heat exchanger chamber partition as the boundary, the section of the first heat pipe located in the flue gas channel of the heat pipe heat exchanger serves as the first heat pipe heating section, and the other section of the first heat pipe located in the air channel of the heat pipe heat exchanger serves as the first heat pipe heat release section; the first heat pipes are sealedly connected to the first heat pipe through holes on the heat pipe heat exchanger chamber partition (such as welding or sealing ring connection); the vertical height of the first heat pipe heat exchanger core heat release section is higher than the first heat pipe heat exchanger core heating section;

[0047] When the rotary heat pipe heat exchanger is an air supply rotary heat pipe heat exchanger, the air inlets of all the air supply rotary heat pipe heat exchangers together constitute the air supply inlet of the low-temperature air preheater, and the air outlets of all the air supply rotary heat pipe heat exchangers together constitute the air supply outlet of the low-temperature air preheater; the flue gas inlets of all the air supply rotary heat pipe heat exchangers together constitute the flue gas inlet of the air supply low-temperature air preheater; the flue gas outlets of all the air supply rotary heat pipe heat exchangers together constitute the flue gas outlet of the air supply low-temperature air preheater;

[0048] When the rotary heat pipe heat exchanger is a primary air rotary heat pipe heat exchanger, the air inlets of all primary air rotary heat pipe heat exchangers together constitute the primary air inlet of the low-temperature air preheater, and the air outlets of all primary air rotary heat pipe heat exchangers together constitute the primary air outlet of the low-temperature air preheater; the flue gas inlets of all primary air rotary heat pipe heat exchangers together constitute the flue gas inlet of the primary air low-temperature air preheater; the flue gas outlets of all primary air rotary heat pipe heat exchangers together constitute the flue gas outlet of the primary air low-temperature air preheater;

[0049] The flue gas inlet of the supply air low-temperature air preheater and the flue gas inlet of the primary air low-temperature air preheater together constitute the flue gas inlet of the low-temperature air preheater; the flue gas outlet of the supply air low-temperature air preheater and the flue gas outlet of the primary air low-temperature air preheater together constitute the flue gas outlet of the low-temperature air preheater;

[0050] Optionally, the flue gas channels of some or all of the rotary heat pipe heat exchangers are interconnected; or / and, the air channels of some or all of the air supply rotary heat pipe heat exchangers are interconnected; or / and, the air channels of some or all of the primary air rotary heat pipe heat exchangers are interconnected;

[0051] Optionally, the heat pipe heat exchanger is further provided with a heat pipe heat exchanger core driving device;

[0052] Optionally, a heat pipe heat exchanger core shaft is provided along the axis of the heat pipe heat exchanger core; a core shaft support device is provided on the heat pipe heat exchanger shell or inside or outside the heat pipe heat exchanger shell; both ends of the heat pipe heat exchanger core shaft are respectively supported on the core shaft support devices; optionally, the heat pipe heat exchanger core drive device is in transmission connection with the heat pipe heat exchanger core shaft, and the heat pipe heat exchanger core drive device can drive the heat pipe heat exchanger core shaft to rotate, thereby driving the heat pipe heat exchanger core to rotate;

[0053] Optionally, a core partition supporting device is provided on the heat pipe heat exchanger shell, the heat pipe heat exchanger mounting base, or the heat pipe heat exchanger chamber partition; the heat pipe heat exchanger core is supported on the core partition supporting device through the core partition; optionally, a sliding device is provided between the core partition and the core partition supporting device; optionally, the core partition is provided with a transmission engaging structure, and the heat pipe heat exchanger core driving device can drive the heat pipe heat exchanger core to rotate through the transmission engaging structure.

[0054] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the outer diameter of the core partition is larger than the inner diameter of the heat pipe heat exchanger core through hole of the heat pipe heat exchanger chamber partition; the core partition is located on the side of the heat pipe heat exchanger air supply channel of the heat pipe heat exchanger chamber partition; optionally, a sealing device is provided between the core partition and the heat pipe heat exchanger chamber partition.

[0055] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the heat pipe heat exchanger core is also provided with a core heating section end plate and a core heat release section end plate; all or part of the heat pipe heating section is connected to the core heating section end plate through an expansion joint; all or part of the heat pipe heat release section is connected to the core heat release section end plate through an expansion joint; the heat pipe heat exchanger core rotating shaft is arranged on the core heating section end plate and the core heat release section end plate.

[0056] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the heat pipe heat exchanger core is also provided with a core heating section end plate and a core heat release section end plate; all or part of the heat pipe heating section is connected to the core heating section end plate through an expansion joint; all or part of the heat pipe heat release section is connected to the core heat release section end plate through an expansion joint; the heat pipe heat exchanger core rotating shaft is arranged on the core heating section end plate and the core heat release section end plate.

[0057] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the through-holes of the heat pipe heat exchanger core are circular or nearly circular.

[0058] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the core partition is circular or nearly circular.

[0059] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the heat pipes are parallel or nearly parallel to each other, and the heat pipes are perpendicular or nearly perpendicular to the core partition.

[0060] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the heat pipe heat exchanger core passes through the heat pipe heat exchanger core through hole in a direction in which the heat pipe is perpendicular or nearly perpendicular to the heat pipe heat exchanger chamber partition, and the core partition remains parallel or nearly parallel to the heat pipe heat exchanger chamber partition.

[0061] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, a straight line or arc passing through the center or near the center of the core partition and perpendicular or nearly perpendicular to the core partition is used as the axis of the heat pipe heat exchanger core, and the heat pipe heat exchanger core can rotate around the axis of the heat pipe heat exchanger core.

[0062] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, a spray tower is connected in series between the desulfurization tower and the chimney; a first air supply heater is provided on the air supply channel directly or indirectly connected to the blower inlet or the blower outlet;

[0063] The spray tower is provided with a spray tower flue gas inlet, a spray tower flue gas outlet, a spray tower heat medium water inlet, and a spray tower heat medium water outlet; a spray tower water receiving device is provided at the bottom of the spray tower; a spray tower water distribution device for heat medium water is provided between the spray tower flue gas inlet and the spray tower flue gas outlet; the spray tower water distribution device is connected to the spray tower heat medium water inlet, and the spray tower water receiving device is connected to the spray tower heat medium water outlet;

[0064] The first air supply heater is provided with a first air supply heater air supply inlet, a first air supply heater air supply outlet, a first air supply heater heat medium water inlet, and a first air supply heater heat medium water outlet;

[0065] The flue gas outlet of the desulfurization tower is directly or indirectly connected to the flue gas inlet of the spray tower, and the flue gas outlet of the spray tower is directly or indirectly connected to the chimney; the heat medium water inlet of the spray tower is directly or indirectly connected to the heat medium water outlet of the first air supply heater; the heat medium water outlet of the spray tower is directly or indirectly connected to the heat medium water inlet of the first air supply heater;

[0066] Preferably, when the first air supply heater is arranged on the air supply passage directly or indirectly connected to the blower inlet, the air supply inlet of the first air supply heater is directly or indirectly connected to the atmosphere; the air supply outlet of the first air supply heater is directly or indirectly connected to the blower inlet; when the first air supply heater is arranged on the air supply passage directly or indirectly connected to the blower outlet, the air supply inlet of the first air supply heater is directly or indirectly connected to the blower outlet, and the air supply outlet of the first air supply heater is directly or indirectly connected to the air supply inlet of the air preheater; preferably, when an air supply heater is provided, the air supply outlet of the first air supply heater is directly or indirectly connected to the air supply inlet of the air supply heater; when a low-temperature air preheater is provided, the air supply outlet of the first air supply heater is directly or indirectly connected to the air supply inlet of the low-temperature air preheater;

[0067] Optionally, a first primary air heater is provided on the primary air channel directly or indirectly connected to the primary air fan inlet; the first primary air heater is provided with a first primary air heater primary air inlet, a first primary air heater primary air outlet, a first primary air heater heat medium water inlet, and a first primary air heater heat medium water outlet; the spray tower heat medium water inlet is also directly or indirectly connected to the first primary air heater heat medium water outlet; the spray tower heat medium water outlet is also directly or indirectly connected to the first primary air heater heat medium water inlet; the first primary air heater primary air inlet is directly or indirectly connected to the atmosphere; the first primary air heater primary air outlet is directly or indirectly connected to the primary air fan inlet;

[0068] Optionally, a spray tower demister is provided on the flue gas passage between the spray tower water distribution device and the chimney;

[0069] Optionally, a first heat medium water circulation pump is provided on the heat medium water pipeline directly or indirectly connected to the heat medium water outlet of the spray tower or the heat medium water inlet of the spray tower;

[0070] Optionally, a packing layer is provided between the spray tower water receiving device and the spray tower water distribution device.

[0071] Preferably, the boiler flue gas waste heat recovery and utilization system is further provided with an absorption heat pump;

[0072] The absorption heat pump includes an evaporator, an absorber, a generator, and a condenser. The evaporator is provided with an evaporator low-temperature heat source inlet, an evaporator low-temperature heat source outlet, an evaporator refrigerant water inlet, and an evaporator refrigerant water vapor outlet; the absorber is provided with an absorber cold water inlet, an absorber cold water outlet, an absorber refrigerant water vapor inlet, an absorber concentrated absorbent solution inlet, and an absorber dilute absorbent solution outlet; the generator is provided with a generator high-temperature heat source inlet, a generator high-temperature heat source outlet, a generator dilute absorbent solution inlet, a generator concentrated absorbent solution outlet, and a generator refrigerant water vapor outlet; the condenser is provided with a condenser cooling water inlet, a condenser cooling water outlet, a condenser refrigerant water vapor inlet, and a condenser refrigerant water outlet;

[0073] The evaporator refrigerant water inlet is directly or indirectly connected to the condenser refrigerant water outlet; the evaporator refrigerant water vapor outlet is directly or indirectly connected to the absorber refrigerant water vapor inlet; the absorber concentrated absorbent solution inlet is directly or indirectly connected to the generator concentrated absorbent solution outlet; the absorber dilute absorbent solution outlet is directly or indirectly connected to the generator dilute absorbent solution inlet; the generator refrigerant water vapor outlet is directly or indirectly connected to the condenser refrigerant water vapor inlet; the absorber cold water outlet is directly or indirectly connected to the condenser cooling water inlet; the absorption heat pump constitutes a heat-increasing absorption heat pump;

[0074] The heat medium water outlet of the spray tower is also directly or indirectly connected to the low-temperature heat source inlet of the evaporator; the low-temperature heat source outlet of the evaporator is directly or indirectly connected to the heat medium water inlet of the spray tower;

[0075] The bypass economizer working fluid water outlet is directly or indirectly connected to the generator high-temperature heat source inlet, and the generator high-temperature heat source outlet is directly or indirectly connected to the bypass economizer working fluid water inlet; or, when the flue heat exchanger is provided, the flue heat exchanger working fluid water outlet is directly or indirectly connected to the generator high-temperature heat source inlet, and the generator high-temperature heat source outlet is directly or indirectly connected to the flue heat exchanger working fluid water inlet; or, when the flue heat exchanger is provided, the generator high-temperature heat source channel is connected in series on the working fluid water channel between the flue heat exchanger working fluid water outlet and the air supply heater working fluid water inlet, the flue heat exchanger working fluid water outlet is directly or indirectly connected to the generator high-temperature heat source inlet, the generator high-temperature heat source outlet is directly or indirectly connected to the air supply heater working fluid water inlet, and the air supply heater working fluid water outlet is directly or indirectly connected to the flue heat exchanger working fluid water inlet;

[0076] Optionally, a high-temperature heat source water pump is provided on the high-temperature heat source channel directly or indirectly connected to the high-temperature heat source inlet of the generator or the high-temperature heat source outlet of the generator;

[0077] Optionally, the high-temperature heat source outlet of the generator is directly or indirectly connected to the working medium water inlet of the bypass economizer through a cooler; optionally, the cooler is a generator of another absorption heat pump or other air supply heater;

[0078] Optionally, a cold water reheater is connected in series to the cold water channel to which the condenser cooling water outlet or the absorber cold water outlet is directly or indirectly connected;

[0079] Optionally, a cold water pump is connected in series to the cold water channel to which the condenser cooling water outlet or the absorber cold water inlet is directly or indirectly connected.

[0080] Preferably, in the above-mentioned boiler flue gas waste heat recovery and utilization system, the heat medium water inlet of the first air supply heater is also directly or indirectly connected to the cooling water outlet of the condenser; the heat medium water outlet of the first air supply heater is also directly or indirectly connected to the cold water inlet of the absorber;

[0081] Optionally, the heat medium water inlet of the first primary air heater is also directly or indirectly connected to the cooling water outlet of the condenser; the heat medium water outlet of the first supply air heater is also directly or indirectly connected to the cold water inlet of the absorber.

[0082] Preferably, the boiler flue gas waste heat recovery and utilization system is further provided with a steam turbine, a condenser, a condensate pump, a low-pressure heater, a deaerator, a feed water pump, and a high-pressure heater;

[0083] The steam turbine is provided with a steam turbine steam inlet, a steam turbine steam outlet, a steam turbine high-pressure extraction steam outlet, and a steam turbine low-pressure extraction steam outlet;

[0084] The condenser is provided with a condenser steam inlet and a condenser working medium water outlet;

[0085] The condensate pump is provided with a condensate pump inlet and a condensate pump outlet;

[0086] The low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet, and a low-pressure heater extraction steam inlet;

[0087] The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet;

[0088] The water pump is provided with a water pump inlet and a water pump outlet;

[0089] The high-pressure heater is provided with a high-pressure heater working medium water inlet, a high-pressure heater working medium water outlet, and a high-pressure heater extraction steam inlet;

[0090] The boiler is also provided with a boiler working medium water inlet and a boiler steam outlet;

[0091] The boiler steam outlet is directly or indirectly connected to the turbine steam inlet; the turbine steam outlet is directly or indirectly connected to the condenser steam inlet; the condenser working fluid water outlet is directly or indirectly connected to the condensate pump inlet; the condensate pump outlet is directly or indirectly connected to the low-pressure heater working fluid water inlet; the low-pressure heater working fluid water outlet is directly or indirectly connected to the deaerator working fluid water inlet; the deaerator working fluid water outlet is directly or indirectly connected to the feed water pump inlet; the feed water pump outlet is directly or indirectly connected to the high-pressure heater working fluid water inlet; the high-pressure heater working fluid water outlet is directly or indirectly connected to the boiler working fluid water inlet; the low-pressure heater extraction steam inlet is directly or indirectly connected to the turbine low-pressure extraction steam outlet; the high-pressure heater extraction steam inlet is directly or indirectly connected to the turbine high-pressure extraction steam outlet;

[0092] The bypass economizer working medium water outlet is directly or indirectly connected to the boiler working medium water inlet; the bypass economizer working medium water inlet is directly connected to the condensate pump outlet and or indirectly connected through other equipment; or the bypass economizer working medium water inlet is directly connected to the feed water pump outlet and or indirectly connected through other equipment;

[0093] The low-pressure heater is a one-stage or multi-stage low-pressure heater; the high-pressure heater is a one-stage or multi-stage high-pressure heater; the high-pressure steam extraction outlet of the steam turbine is a one-stage or multi-stage outlet; the low-pressure steam extraction outlet of the steam turbine is a one-stage or multi-stage outlet;

[0094] Optionally, when the bypass economizer includes a first-stage bypass heat exchange module and a second-stage bypass heat exchange module connected in series, the deaerator and the first bypass deaerator are merged into one deaerator, the feed water pump and the first bypass feed water pump are merged into one feed water pump, and the working water outlet of the second-stage bypass heat exchange module and the working water outlet of the low-pressure heater are directly or indirectly connected to the working water inlet of the first-stage bypass heat exchange module and the working water inlet of the high-pressure heater through the deaerator and the feed water pump.

[0095] The boiler is a device that burns coal to release heat and generate flue gas.

[0096] The spray tower water distribution device can be a water distribution trough, water distribution pipe, or spray device, etc., as long as it can distribute the heat transfer water into the flue gas. The spray tower water receiving device can be a tower pool located at the bottom of the spray tower, or other structural forms, as long as it can collect the heat transfer water flowing out of the water distribution device.

[0097] An absorption heat pump is a circulatory system that utilizes high-quality energy to transfer heat from low to high temperatures. Driven by thermal energy, it uses a lithium bromide solution or other highly hygroscopic solutions, such as ammonia, as the absorbent, and water or an aqueous solution as the refrigerant. It absorbs heat from a low-quality heat source to produce medium- to high-temperature hot water or steam for process or heating purposes, thereby recovering waste heat and transferring heat energy from low to high temperatures.

[0098] Absorption heat pumps optionally include auxiliary components such as a heat exchanger exhaust system and shielded pumps (solution pump and refrigerant pump). This exhaust system removes air and other non-condensable gases from the unit, maintaining a high vacuum. The specific structures of other common absorption heat pump components are conventional and will not be detailed in this article.

[0099] The heat pipe described in this article refers to a closed hollow vacuum tube, in which a part of the space is filled with an evaporable intermediate medium, such as water. The heat pipe is provided with a heating section (also called an evaporation section) and a heat releasing section (also called a condensation section). When the heat source transfers heat to the liquid intermediate medium in the heat pipe through the wall of the heat pipe's heating section, the intermediate medium is heated, absorbs the latent heat of vaporization to produce intermediate medium vapor, and the intermediate medium vapor flows to the heat releasing section of the heat pipe; in the heat releasing section of the heat pipe, the intermediate medium vapor transfers heat to the cold side medium outside the heat pipe through the wall of the heat releasing section of the heat pipe. When the latent heat of vaporization of the intermediate medium vapor is released, the intermediate medium vapor is reheated. The condensed intermediate medium, called the liquid, returns to the heat receiving section of the heat pipe under the influence of gravity (when the heat release section is vertically higher than the heat receiving section) and / or capillary action (when a capillary structure is provided within the heat pipe), where it continues to be heated and evaporated by the heat source. It then flows to the heat release section of the heat pipe to be cooled, forming a repetitive cycle. Heat is continuously transferred from the heat receiving section of the heat pipe to the heat release section, and the heat source (hot-side medium) continuously transfers heat to the cold-side medium through the heat pipe. The specific structure and principle of the heat pipe are conventional.

[0100] The heat users mentioned in this article refer to users who absorb heat, such as steam turbines, hot water users (including boiler working fluid water makeup), steam users, etc.

[0101] The communication mentioned in this article includes direct communication and indirect communication;

[0102] In this document, "optionally" means selectable, for example, with or without, set or not set, adopted in a certain way or not adopted in a certain way.

[0103] The sequential arrangement, sequential connection, etc. of the various devices or components described herein involve expressions of sequential arrangement, which does not exclude the situation where other devices or components are arranged between two sequentially adjacent devices or components. BRIEF DESCRIPTION OF THE DRAWINGS

[0104] Figure 1 This is a structural diagram of an implementation method of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0105] Figure 1-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0106] Figure 1-2 This is a structural diagram of another embodiment of a bypass economizer in a boiler flue gas waste heat recovery and utilization system of the utility model;

[0107] Figure 2 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0108] Figure 2-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0109] Figure 2-2 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0110] Figure 2-3 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0111] Figure 3 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0112] Figure 3-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0113] Figure 3-2 This is a structural diagram of an embodiment of a low-temperature air preheater in a boiler flue gas waste heat recovery and utilization system of the utility model;

[0114] Figure 4-1 This is a structural diagram of an implementation method of a primary air rotary cage heat exchanger;

[0115] Figure 4-1-1 yes Figure 4-1 The schematic cross-sectional view of the primary air rotary cage heat exchanger in the AA direction is shown;

[0116] Figure 4-1-2 yes Figure 4-1 A vertical cross-sectional view of the primary air rotary cage heat exchanger shown;

[0117] Figure 4-1-3 yes Figure 4-1The cross-sectional schematic diagram of the primary air rotary cage heat exchanger in the BB direction is shown;

[0118] Figure 4-1-4 This is a schematic diagram of the three-dimensional structure of an embodiment of a primary air rotary cage heat exchanger core in a primary air rotary cage heat exchanger;

[0119] Figure 4-1-5 This is a schematic diagram of the three-dimensional structure of an embodiment of a front end plate of a primary air cage heat exchanger core;

[0120] Figure 4-1-6 This is a schematic diagram of the three-dimensional structure of an embodiment of a rear end plate of a primary air cage heat exchanger core;

[0121] Figure 4-2 It is a structural diagram of an embodiment of an air supply rotary cage heat exchanger;

[0122] Figure 4-2-1 yes Figure 4-2 The cross-sectional diagram of the air supply rotary heat exchanger in the AA direction is shown;

[0123] Figure 4-2-2 yes Figure 4-2 A vertical cross-sectional view of the air supply rotary cage heat exchanger shown;

[0124] Figure 4-2-3 yes Figure 4-2 A cross-sectional schematic diagram of the air supply rotary heat exchanger in the BB direction is shown;

[0125] Figure 4-2-4 It is a schematic diagram of the three-dimensional structure of an embodiment of an air supply rotary heat exchanger core in an air supply rotary heat exchanger;

[0126] Figure 4-2-5 This is a schematic diagram of the three-dimensional structure of an embodiment of a front end plate of an air supply cage heat exchanger core;

[0127] Figure 4-2-6 This is a schematic diagram of the three-dimensional structure of an embodiment of a rear end plate of an air supply cage heat exchanger core;

[0128] Figure 4-1-3-1 This is a structural diagram of another embodiment of the primary air rotary cage heat exchanger in the boiler flue gas waste heat recovery and utilization system of the utility model;

[0129] Figure 4-1-4-1 yes Figure 4-1-3-1 A schematic diagram of the three-dimensional structure of the primary air rotary cage heat exchanger core in the primary air rotary cage heat exchanger shown;

[0130] Figure 4-2-3-1 This is a structural diagram of another embodiment of the air supply rotary cage heat exchanger in the boiler flue gas waste heat recovery and utilization system of the utility model;

[0131] Figure 4-2-4-1 yes Figure 4-2-3-1 A schematic diagram of the three-dimensional structure of the rotary cage heat exchanger core in the air supply rotary cage heat exchanger shown in FIG;

[0132] Figure 5 This is a schematic diagram of the three-dimensional structure of an embodiment of the rotary heat pipe heat exchanger of the utility model;

[0133] Figure 5-1 yes Figure 5 The schematic diagram of the planar structure of the rotary heat pipe heat exchanger shown;

[0134] Figure 5-2 yes Figure 5-1 AA cross-sectional structural diagram of the rotary heat pipe heat exchanger shown;

[0135] Figure 5-3 yes Figure 5-1 BB cross-sectional structural diagram of the rotary heat pipe heat exchanger shown;

[0136] Figure 5-4 It is a structural schematic diagram of an embodiment of a heat pipe heat exchanger chamber partition of a rotary heat pipe heat exchanger;

[0137] Figure 5-5 This is a structural diagram of an embodiment of a core partition of a rotary heat pipe heat exchanger;

[0138] Figure 5-6 It is a structural schematic diagram of an embodiment of a heat pipe heat exchanger core of a rotary heat pipe heat exchanger;

[0139] Figure 5-7 This is a structural diagram of an embodiment of connecting a heat pipe heat exchanger core and a heat pipe heat exchanger chamber partition of a rotary heat pipe heat exchanger;

[0140] Figure 5-8 yes Figure 5-7 A schematic cross-sectional view of the superheat tube heat exchanger core axis in the structure shown;

[0141] Figure 5-9 It is a structural schematic diagram of another embodiment of a rotary heat pipe heat exchanger;

[0142] Figure 5-10 This is a schematic diagram of a cross-sectional structure of an embodiment of a heat pipe heat exchanger core rotating shaft passing through the heat pipe heat exchanger core axis;

[0143] Figure 5-11 yes Figure 10 The three-dimensional structural diagram of the heat pipe heat exchanger core shaft is shown;

[0144] Figure 5-12 is a schematic diagram of a three-dimensional structure of an embodiment in which the core shaft of the heat pipe heat exchanger is supported on the shell of the heat pipe heat exchanger;

[0145] Figure 5-1 3 is a schematic structural diagram of another embodiment of a heat pipe heat exchanger chamber partition;

[0146] Figure 5-1 4 is a schematic diagram of the three-dimensional structure of an embodiment of a heat pipe heat exchanger core, a heat pipe heat exchanger chamber partition, and a first heat pipe;

[0147] Figure 5-1 5 yes Figure 5-1 4 is a schematic diagram of a cross-sectional three-dimensional structure of the superheater heat exchanger core axis;

[0148] Figure 5-1 6 is a schematic diagram of the three-dimensional structure of another embodiment of the heat pipe heat exchanger;

[0149] Figure 6-1 It is a structural schematic diagram of an embodiment of a heat pipe heat exchanger chamber partition;

[0150] Figure 6-2 It is a structural schematic diagram of an embodiment of a core partition;

[0151] Figure 6-3 It is a three-dimensional structural diagram of an embodiment of a connection method between a chamber partition and a core partition of a heat pipe heat exchanger;

[0152] Figure 6-4 yes Figure 6-3 A schematic cross-sectional view of the heat pipe heat exchanger core axis according to the embodiment shown;

[0153] Figure 6-5 It is a schematic cross-sectional structure diagram of another embodiment of the connection method between the chamber partition and the core partition of the heat pipe heat exchanger, passing through the axis of the heat pipe heat exchanger core;

[0154] Figure 7-1 It is a structural schematic diagram of another embodiment of a heat pipe heat exchanger core;

[0155] Figure 7-2 It is a schematic diagram of the three-dimensional structure of another embodiment of connecting the heat pipe heat exchanger core and the heat pipe heat exchanger chamber partition;

[0156] Figure 7-3 yes Figure 7-2 A schematic diagram of a cross-sectional three-dimensional structure of the superheater heat exchanger core axis according to the embodiment shown;

[0157] Figure 7-4 This is a schematic diagram of a three-dimensional structure of another embodiment in which the core shaft of a heat pipe heat exchanger is supported on the shell of a heat pipe heat exchanger;

[0158] Figure 8 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0159] Figure 8-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0160] Figure 9 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0161] Figure 9-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0162] Figure 9-2 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0163] Figure 10 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0164] Figure 11 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0165] Figure 11-1 This is a structural diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the utility model;

[0166] Figure 11-2 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model. DETAILED DESCRIPTION

[0167] Hereinafter, specific embodiments of the present invention will be described in detail with reference to the accompanying drawings.

[0168] Figure 1 It is a structural diagram of an implementation method of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0169] like Figure 1 As shown, the boiler flue gas waste heat recovery and utilization system includes: a boiler 1, a bypass economizer 15, an air preheater 2, a dust collector 60, a desulfurization tower 6, a chimney 7, a blower 8, a primary fan 5, and a coal mill 3; wherein,

[0170] The boiler 1 is provided with a boiler coal inlet 1-1, a boiler air supply inlet 1-2, and a boiler flue gas outlet 1-3;

[0171] The bypass economizer 15 is provided with a bypass economizer flue gas inlet 15-1, a bypass economizer flue gas outlet 15-2, a bypass economizer working fluid water inlet 15-3, and a bypass economizer working fluid water outlet 15-4;

[0172] The air preheater 2 is provided with an air preheater flue gas inlet 2-1, an air preheater flue gas outlet 2-2, an air preheater air supply inlet 2-3-2, an air preheater air supply outlet 2-4-2, an air preheater primary air inlet 2-3-1, and an air preheater primary air outlet 2-4-1;

[0173] The dust collector 60 is provided with a dust collector inlet 60-1 and a dust collector outlet 60-2;

[0174] The desulfurization tower 6 includes: a desulfurization tower body 6-1 and a slurry circulation pump 6-2; a slurry pool 6-3 is provided at the bottom of the desulfurization tower body 6-1; a desulfurization tower flue gas inlet 6-5 is provided at the lower part of the desulfurization tower body 6-1, and a desulfurization tower flue gas outlet 6-4 is provided at the upper part of the desulfurization tower body; a desulfurization tower spray device 6-6 is provided between the desulfurization tower flue gas inlet 6-5 and the desulfurization tower flue gas outlet 6-4, the desulfurization tower spray device 6-6 is directly or indirectly connected to the slurry circulation pump 6-2, and the slurry circulation pump 6-2 is directly or indirectly connected to the slurry pool 6-3; optionally, a desulfurization tower demister 6-7 is provided between the desulfurization tower spray device 6-6 and the desulfurization tower flue gas outlet 6-4;

[0175] The blower 8 is provided with a blower inlet 8-1 and a blower outlet 8-2;

[0176] The primary fan 5 is provided with a primary fan inlet 5-1 and a primary fan outlet 5-2;

[0177] The coal mill 3 is provided with a coal mill coal inlet 3-1, a primary air inlet 3-2, and a primary air outlet 3-3;

[0178] The boiler flue gas outlet 1-3 is directly or indirectly connected to the air preheater flue gas inlet 2-1 and the bypass economizer flue gas inlet 15-1; the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 are directly or indirectly connected to the dust collector inlet 60-1; the dust collector outlet 60-2 is directly or indirectly connected to the desulfurization tower flue gas inlet 6-5; the desulfurization tower flue gas outlet 6-4 is directly or indirectly connected to the chimney 7;

[0179] The blower outlet 8-2 is directly or indirectly connected to the air preheater air inlet 2-3-2; the air preheater air outlet 2-4-2 is directly or indirectly connected to the boiler air inlet 1-2;

[0180] The primary air fan outlet 5-2 is directly or indirectly connected to the air preheater primary air inlet 2-3-1 and the coal mill primary air inlet 3-2; the air preheater primary air outlet 2-4-1 is directly or indirectly connected to the coal mill primary air inlet 3-2; the coal mill air and powder outlet 3-3 is directly or indirectly connected to the boiler coal inlet 1-3;

[0181] A bypass air duct 4-0 is provided between the air supply duct directly or indirectly connected to the air preheater air supply outlet 2-4-2 and the primary air duct directly or indirectly connected to the air preheater primary air outlet 2-4-1; a bypass baffle 4-1 is provided on the bypass air duct 4-0;

[0182] The working process is:

[0183] Coal is fed into the coal mill 3 through the coal inlet 3-1 of the coal mill. Driven by the primary fan 5, part of the primary air is fed into the coal mill 3 through the primary air inlet 3-2 of the coal mill, and part of the primary air is fed into the air preheater through the primary air inlet 2-3-1 of the air preheater. The flue gas from the boiler flue gas outlet 1-3 enters the air preheater 2 through the flue gas inlet 2-1 of the air preheater. The primary air absorbs heat from the flue gas in the air preheater 2 and its temperature increases. Then, it flows out of the air preheater 2 through the primary air outlet 2-4-1 of the air preheater and enters the coal mill 3 through the primary air inlet 3-2 of the coal mill. The heat from the air preheater 2 The primary air with a higher temperature (hereinafter referred to as hot primary air) and the primary air with a lower temperature (hereinafter referred to as cold primary air) from the primary fan are mixed into the primary air with an appropriate temperature (hereinafter referred to as warm primary air). The coal is dried by the warm primary air in the pulverizer and ground into coal powder. The coal powder is carried by the warm primary air in the form of an air-powder mixture and sent into the furnace of the boiler 1 through the boiler coal inlet 1-1; the blower 8 sends the supply air (air) into the furnace of the boiler 1 through the air preheater 2 and the boiler supply air inlet 1-2. The coal burns to release heat, and the smoke generated by the combustion flows out of the boiler 1 through the boiler smoke gas outlet 1-3; then a Part of the flue gas is sent into the air preheater 2 through the air preheater flue gas inlet 2-1 to heat the supply air from the blower outlet 8-2 and the primary air from the primary fan outlet 3-2 (when the air preheater 2 is a rotary air preheater, the flue gas first stores heat in the heat storage element in the air preheater rotor, and then heats the supply air and primary air through the heat storage element in the air preheater rotor that has stored heat and heated up). After the flue gas is cooled by heat exchange, it flows out of the air preheater 2 through the air preheater flue gas outlet 2-2; the other part of the flue gas enters the flue gas channel of the bypass economizer 15 through the bypass economizer flue gas inlet 15-1. After heat exchange and cooling with the working water in the working water channel of the bypass economizer 15, the flue gas flows out of the bypass economizer 15 through the flue gas outlet 15-2 of the bypass economizer. The working water in the working water channel of the bypass economizer 15 is delivered to the next process link or used by the heating user. The flue gas from the flue gas outlet 2-2 of the air preheater and the flue gas from the flue gas outlet 15-2 of the bypass economizer enter the dust collector 60 through the dust collector inlet 60-1. After dust removal by the dust collector 60, the flue gas flows out of the dust collector 60 through the dust collector outlet 60-2, and then flows into the flue gas inlet 6-5 of the desulfurization tower through the optional induced draft fan 61 and enters the interior of the desulfurization tower 6.

[0184] The flue gas enters the desulfurization tower 6 from the desulfurization tower flue gas inlet 6-5 and flows from bottom to top through the desulfurization tower spray device 6-6, the optional desulfurization tower demister 6-7, and the desulfurization tower flue gas outlet 6-4. The desulfurization slurry in the slurry pool 6-3 enters the desulfurization tower spray device 6-6 under the drive of the slurry circulation pump 6-2. The desulfurization tower spray device 6-6 sprays the desulfurization slurry from top to bottom into the flue gas. The flue gas and the desulfurization slurry exchange heat and transfer mass in a countercurrent manner. After heat exchange and desulfurization, the flue gas is optionally defogged in the desulfurization tower demister 6-7 in a saturated or near-saturated state, flows out of the desulfurization tower 6 through the desulfurization tower flue gas outlet 6-4, and is discharged into the atmosphere through the chimney 7.

[0185] In order to ensure the normal flow of the air-powder mixture and the amount of oxygen for the initial combustion of coal, the warm primary air volume needs to match the amount of coal entering the pulverizer 2. Therefore, the warm primary air volume, that is, the total amount of the cold primary air volume entering the pulverizer plus the hot primary air volume, is determined according to the amount of coal entering the pulverizer 2; at the same time, in order to ensure the grinding efficiency of the pulverizer, improve the efficiency of the boiler, and prevent the spontaneous combustion of coal powder, it is necessary to ensure that the air-powder mixture at the outlet of the pulverizer 2 is within a certain temperature range. When the coal is relatively wet, the hot primary air volume required by the coal mill 2 increases and the cold primary air volume decreases. At this time, the bypass damper 4-1 is turned down or closed to reduce the bypass hot primary air volume from the air preheater primary air outlet 2-4-1 to the air supply channel between the air preheater air outlet 2-4-2 and the boiler air supply inlet 1-2 (the hot primary air volume entering the furnace), increase the hot primary air volume entering the coal mill 2, and correspondingly reduce the cold primary air volume entering the coal mill 2, so as to increase the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the coal mill coal outlet. When the coal is relatively dry, the amount of hot primary air required by the coal mill 2 is reduced and the amount of cold primary air is increased. At this time, the bypass damper 4-1 is opened wide to increase the amount of hot primary air bypassing the air preheater primary air outlet 2-4-1 to the bypass hot primary air volume in the air supply channel between the air preheater air outlet 2-4-2 and the boiler air supply inlet 1-2 (the amount of hot primary air entering the furnace), reduce the amount of hot primary air entering the coal mill 2, and increase the amount of cold primary air entering the coal mill 2 accordingly, so as to reduce the drying heat of the hot primary air on the coal and maintain the temperature of the air-powder mixture at the coal powder outlet of the coal mill.

[0186] For a specific air preheater 2, the heat exchange capacity of the primary air and supply air flowing through the air preheater 2 and the flue gas flowing through the air preheater 2 is determined. The primary air heating capacity of the air preheater 2 needs to ensure that the coal mill 2 can work normally even when the coal is relatively wet. In some cases, when the coal is relatively dry, the demand for hot primary air is reduced, and the primary air heating capacity of the air preheater 2 will be wasted. At the same time, the heat exchange amount of the flue gas in the air preheater 2 is reduced, and the flue gas temperature at the air preheater flue gas outlet 2-2 will increase, and the heat loss of the exhaust gas will increase, resulting in energy waste. The utility model is provided with a bypass air duct 4-0 and a bypass baffle 4-1, which can solve the above problems. In addition, for a normal design, there is a situation where the hot primary air pressure of the air preheater primary air outlet 2-4-1 is higher than the supply air pressure of the air preheater supply air outlet 2-4-2. In this case, when the coal is relatively dry, the bypass damper 4-1 is opened to increase the bypass hot primary air volume (the hot primary air volume entering the furnace) from the primary air outlet 2-4-1 of the air preheater to the air supply channel between the air preheater supply air outlet 2-4-2 and the boiler supply air inlet 1-2. This is equivalent to transferring part of the primary air heating capacity of the air preheater 2 to the supply air heating capacity of the air preheater 2, avoiding the waste of the primary air heating capacity of the air preheater 2 and the increase in the exhaust gas temperature of the air preheater 2.

[0187] Since the flow rate, specific heat capacity and total heat capacity of the flue gas entering the air preheater 2 are greater than the total flow rate and specific heat capacity, i.e. the total heat capacity, of the air supply volume plus the primary air volume entering the air preheater 2, a bypass economizer 15 is provided to divert part of the flue gas entering the air preheater 2 into the bypass economizer 15, which can avoid the increase in the exhaust temperature of the air preheater and the increase in heat loss. At the same time, since the temperature of the flue gas entering the air preheater 2 is relatively high and the thermal energy quality is high, the use of the working water and the thermal energy utilization efficiency can be improved by using the bypass economizer 15 to heat the working water.

[0188] In addition, by installing a bypass economizer 15 to divert a portion of the flue gas entering the air preheater 2, the system resistance can be significantly reduced, which can also reduce the power consumption of the induced draft fan. Assuming the flue gas pressure difference between the inlet and outlet of the air preheater 2 is U, the flue gas flow rate is Q, and the air preheater resistance is R, R = U / Q; after adopting the technology of the utility model, the bypass flue gas flow rate diverted from the air preheater 2 to the bypass economizer 15 is Q1, and the flue gas pressure difference between the inlet and outlet of the air preheater 2 becomes U1 = (Q-Q1)R. It can be seen that reducing the flue gas flow rate of the air preheater can significantly reduce the pressure difference between the inlet and outlet of the air preheater flue gas.

[0189] The primary fan 5 may be one or more units (only one is shown in the figure); the blower 8 may be one or more units (only one is shown in the figure); the coal mill 3 may be one or more units (only one is shown in the figure); the air preheater 2 may be one or more units (only one is shown in the figure);

[0190] Optionally, an induced draft fan 61 is connected in series on the flue gas passage between the dust collector outlet 60-2 and the desulfurization tower 6. The induced draft fan is used to draw the flue gas in the boiler furnace and send it to the chimney;

[0191] Optionally, the bypass economizer working medium water outlet 15-4 is also connected to the next process link or heat user (not shown in the figure);

[0192] Optionally, a first desulfurization tower (not shown in the figure) is connected in series to the flue directly or indirectly connected to the desulfurization tower flue gas inlet 6-5 or the desulfurization tower flue gas outlet 6-4;

[0193] Optionally, a bypass feedwater pump and / or a bypass deaerator and / or a buffer water tank (not shown) is provided on the working water channel to which the bypass economizer working water inlet 15-3 is directly or indirectly connected. The bypass feedwater pump drives the working water into the bypass economizer 15; the bypass deaerator removes oxygen from the working water to prevent the working water from corroding the working water channel; and the buffer water tank provides buffer capacity for the bypass feedwater pump to ensure safe operation of the pump.

[0194] Figure 1-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0195] like Figure 1-1 As shown, Figure 1 The difference is that the bypass air duct 4-0 is connected in series with a bypass fan 4-2.

[0196] The working process is as follows:

[0197] When the coal is relatively wet, the hot primary air volume required by the coal mill 2 increases and the cold primary air volume decreases. At this time, the bypass fan 4-2 is turned on or turned up, and the high-temperature supply air from the air preheater supply air outlet 2-4-2 is pumped into the hot primary air channel between the air preheater primary air outlet 2-4-1 and the coal mill primary air inlet 3-2 or the coal mill primary air inlet 3-2 through the bypass air duct 4-0 and the bypass fan 4-2 booster pump, thereby increasing the hot primary air volume entering the coal mill 2 and correspondingly reducing the cold primary air volume entering the coal mill 2 to increase the hot primary air volume. The secondary air dries the coal and maintains the temperature of the air-powder mixture at the coal mill pulverized coal outlet. When the coal is drier, the amount of hot primary air required by the coal mill 2 decreases and the amount of cold primary air increases. At this time, the bypass fan 4-2 is turned off or stopped, and the bypass flow from the air preheater air outlet 2-4-2 to the coal mill primary air inlet 3-2 is reduced, thereby reducing the amount of hot primary air entering the coal mill 2 and correspondingly increasing the amount of cold primary air entering the coal mill 2 to reduce the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the coal mill pulverized coal outlet.

[0198] For a specific air preheater 2, the heat exchange capacity of the primary air and supply air flowing through the air preheater 2 and the flue gas flowing through the air preheater 2 is determined. The primary air heating capacity of the air preheater 2 needs to ensure that the pulverizer 2 can work normally even when the coal is relatively wet. In some cases, when the coal is relatively dry, the demand for hot primary air is reduced, and the primary air heating capacity of the air preheater 2 will be wasted. At the same time, the heat exchange of the flue gas in the air preheater 2 is reduced, and the flue gas temperature at the air preheater flue gas outlet 2-2 will increase, and the heat loss of the exhaust gas will increase, resulting in energy waste. The utility model is provided with a bypass air duct 4-0 and a bypass fan 4-2, which can solve the above problems. In addition, for a normal design, there is a situation where the hot primary air pressure of the air preheater primary air outlet 2-4-1 is higher than the supply air pressure of the air preheater supply air outlet 2-4-2. In this case, when the total heat exchange capacity of the air preheater 2 (the heat exchange capacity of the total air volume of the primary air flowing through the air preheater 2 plus the supply air volume and the flue gas flowing through the air preheater 2) is constant, the heat exchange capacity of the flue gas and the supply air of the air preheater 2 can be appropriately increased (increased heat exchange area), and the heat exchange capacity of the flue gas and the primary air of the air preheater 2 can be appropriately reduced (reduced heat exchange area). When the coal is relatively wet, the bypass fan 4-2 is turned on or turned up, and the bypass air supply volume of the air supply outlet 2-4-2 of the air preheater sent to the coal mill 2 is increased to meet the drying capacity of the coal mill 2, which is equivalent to utilizing part of the air supply heating capacity of the air preheater 2 to complete the primary air heating capacity of the air preheater 2; when the coal is relatively drier, the bypass fan 4-2 is turned off or stopped, and the bypass air supply volume of the air supply outlet 2-4-2 of the air preheater sent to the coal mill 2 is reduced and turned off, which is equivalent to using the capacity of the air preheater used to heat the primary air to heat the supply air, which can make full use of the heat exchange area of ​​the air preheater 2 and reduce the exhaust temperature and heat loss of the air preheater 2.

[0199] Figure 1-2 This is a structural diagram of another embodiment of the bypass economizer in the boiler flue gas waste heat recovery and utilization system of the utility model. Figure 1-2As shown, the bypass economizer 15 includes a first-stage bypass heat exchange module 15a and a second-stage bypass heat exchange module 15b connected in series; the first-stage bypass heat exchange module is provided with a bypass economizer flue gas inlet 15-1, a first-stage bypass heat exchange module flue gas outlet 15a-2, a first-stage bypass heat exchange module working medium water inlet 15a-3, and a bypass economizer working medium water outlet 15-4; the second-stage bypass heat exchange module 15b is provided with a second-stage bypass heat exchange module flue gas inlet 15b-1, a bypass economizer flue gas outlet 15-2, the bypass economizer working medium water inlet 15-3, and the second-stage bypass heat exchange module working medium water outlet 15b-4; the first-stage bypass heat exchange module flue gas outlet 15a-2 is directly or indirectly connected to the second-stage bypass heat exchange module flue gas inlet 15b-1, and the second-stage bypass heat exchange module working medium water outlet 15b-4 is directly or indirectly connected to the first-stage bypass heat exchange module working medium water inlet 15a-3 through the optional first bypass deaerator 30C and / or the optional first bypass feed water pump 32C;

[0200] The working process is as follows:

[0201] Flue gas from boiler flue gas outlets 1-3 passes through first-stage bypass heat exchange module 15a and second-stage bypass heat exchange module 15b, where it exchanges heat with working water for cooling before being sent to dust collector 60. The working water is first heated by heat exchange with the flue gas in second-stage bypass heat exchange module 15b before being sent to first bypass deaerator 30C for deoxygenation. After being pressurized by bypass feedwater pump 32C, it is sent to first-stage bypass heat exchange module 15a for further heat exchange with the higher-temperature flue gas. This process deoxidizes and pressurizes the working water at the appropriate working water temperature point in the working water heating process, namely, working water outlet 15b-4 of the second bypass heat exchange module, to meet system operating requirements. It also allows the bypass economizer to be divided into high-pressure and low-pressure sections, saving investment.

[0202] Figure 2 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0203] like Figure 2 As shown, in Figure 1 On this basis, a flue heat exchanger 22, a supply air heater 9, and a primary air heater 10 are also provided;

[0204] The flue heat exchanger 22 is provided with a flue heat exchanger flue gas inlet 22-1, a flue heat exchanger flue gas outlet 22-2, a flue heat exchanger air supply heat medium water inlet 22-3-2, a flue heat exchanger air supply heat medium water outlet 22-4-2, a flue heat exchanger primary air heat medium water inlet 22-3-1, and a flue heat exchanger primary air heat medium water outlet 22-4-1; the air supply heater 9 is provided with an air supply heater air inlet 9-1, an air supply heater air outlet 9-2, an air supply heater heat medium water inlet 9-3, and an air supply heater heat medium water outlet 9-4; the primary air heater 10 is provided with a primary air heater primary air inlet 10-1, a primary air heater primary air outlet 10-2, a primary air heater heat medium water inlet 10-3, and a primary air heater heat medium water outlet 10-4;

[0205] The air supply channel of the air supply heater 9 is connected in series to the air supply channel between the blower outlet 8-2 and the air supply inlet 2-3-2 of the air preheater; the air supply inlet 9-1 of the air supply heater is directly or indirectly connected to the blower outlet 8-2; the air supply outlet 9-2 of the air supply heater is directly or indirectly connected to the air supply inlet 2-3-2 of the air preheater;

[0206] The primary air channel of the primary air heater 10 is connected in series to the primary air channel directly or indirectly connected to the primary fan outlet 5-2; the primary air inlet 10-1 of the primary air heater is directly or indirectly connected to the primary fan outlet 5-2; the primary air outlet 10-2 of the primary air heater is directly or indirectly connected to the primary inlet 2-3-1 of the air preheater and the primary air inlet 3-2 of the coal mill;

[0207] The flue heat exchanger air supply heat medium water outlet 22-4-2 is directly or indirectly connected to the air supply heater heat medium water inlet 9-3; the air supply heater heat medium water outlet 9-4 is directly or indirectly connected to the flue heat exchanger air supply heat medium water inlet 22-3-2; the flue heat exchanger primary air heat medium water outlet 22-4-1 is directly or indirectly connected to the primary air heater heat medium water inlet 10-3; the primary air heater heat medium water outlet 10-4 is directly or indirectly connected to the flue heat exchanger primary air heat medium water inlet 22-3-1;

[0208] The flue gas channel of the flue heat exchanger 22 is connected in series on the flue gas channel between the air preheater flue gas outlet 2-2 and the dust collector inlet 60-1; the flue heat exchanger flue gas inlet 22-1 is directly or indirectly connected to the air preheater flue gas outlet 2-2; the flue heat exchanger flue gas outlet 22-2 is directly or indirectly connected to the dust collector inlet 60-1.

[0209] The working process is as follows:

[0210] The flue gas generated by combustion flows out of the boiler 1 through the boiler flue gas outlet 1-3; then a part of the flue gas is sent into the air preheater 2 through the air preheater flue gas inlet 2-1, heating the supply air from the blower outlet 8-2 and the primary air from the primary air outlet 5-2 of the primary fan, and after cooling, flows out of the air preheater 2 through the air preheater flue gas outlet 2-2, and then enters the flue gas channel in the flue heat exchanger 22 through the flue heat exchanger flue gas inlet 22-1, heating the supply air heat medium water flowing through the supply air heat medium water channel of the flue heat exchanger 22 and the primary air heat medium water flowing through the flue heat exchanger 22 The primary air in the channel is cooled by the heat medium water and then flows out of the flue heat exchanger 22 through the flue gas outlet 22-2 of the flue heat exchanger; another part of the flue gas enters the flue gas channel of the bypass economizer 15 through the bypass economizer flue gas inlet 15-1, exchanges heat with the working medium water in the working medium water channel of the bypass economizer 15 and is cooled, and then flows out of the bypass economizer 15 through the bypass economizer flue gas outlet 15-2; the flue gas from the flue gas outlet 22-2 of the flue heat exchanger and the flue gas from the flue gas outlet 15-2 of the bypass economizer are successively dedusted by the dust collector 60 and desulfurized by the desulfurization tower 6, and then sent to the chimney 7 and discharged into the atmosphere.

[0211] The heat medium water for air supply flows through the heat medium water channel of the flue heat exchanger through the heat medium water inlet 22-3-2 of the flue heat exchanger. The heat medium water for air supply absorbs the waste heat of the flue gas through heat exchange and its temperature rises. Then, it enters the heat medium water channel of the air supply heater 9 through the heat medium water outlet 22-4-2 of the flue heat exchanger and the heat medium water inlet 9-3 of the air supply heater. The heat medium water heats the air flowing through the air supply channel of the air supply heater 9 and its temperature drops. Then, it flows out through the heat medium water outlet 9-4 of the air supply heater and returns to the heat medium water inlet 22- 3-2 is recycled; driven by the blower 8, the supply air enters the air supply channel of the air heater 9 through the air supply inlet 9-1 of the air heater, is heated by the supply air heat medium water from the flue heat exchanger 22, and then flows out of the air heater 9 through the air supply outlet 9-2 of the air heater, and then enters the air preheater 2 through the air preheater air supply inlet 2-3-2, is further heated by the flue gas from the boiler flue gas outlet 1-3, and then flows out of the air preheater 2 through the air preheater air supply outlet 2-4-2, and finally enters the boiler furnace through the boiler air supply inlet 1-2;

[0212] The primary air heat medium water flows through the primary air heat medium water channel of the flue heat exchanger 22 through the primary air heat medium water inlet 22-3-1 of the flue heat exchanger. The primary air heat medium water absorbs the waste heat of the flue gas through heat exchange and its temperature rises. Then it enters the heat medium water channel of the primary air heater 10 through the primary air heat medium water outlet 22-4-1 of the flue heat exchanger and the heat medium water inlet 10-3 of the primary air heater. The heat medium water heats the primary air flowing through the primary air channel of the primary air heater 10 and its temperature drops. Then it flows out through the heat medium water outlet 10-4 of the primary air heater and then returns to the primary air heat medium water inlet 22-3-1 of the flue heat exchanger for recycling. The primary air is driven by the primary fan 5 and passes through the primary air heater primary air channel. The air enters the primary air channel of the primary air heater 10 from the inlet 10-1, is heated by the primary air heat medium water from the flue heat exchanger 22, and then flows out of the primary air heater 10 through the primary air outlet 10-2 of the primary air heater. The latter part enters the air preheater 2 through the air preheater primary air inlet 2-3-1, is further heated by the flue gas from the boiler flue gas outlet 1-3, and then flows out of the air preheater 2 through the air preheater primary air outlet 2-4-1, and then enters the coal mill through the coal mill primary air inlet 3-2 (this part of the primary air is hot primary air); a part of the primary air does not pass through the air preheater 2 but enters the coal mill 3 through the coal mill primary air inlet 3-2 (this part of the primary air is called cold primary air).

[0213] When the coal volume and humidity entering pulverizer 3 are constant, the temperature of the cold primary air entering pulverizer 3 increases. While maintaining a constant temperature of the air-to-coal mixture at pulverizer outlet 3-3, the volume of hot primary air entering pulverizer 3 decreases and the volume of cold primary air increases. The primary air heating capacity of air preheater 2 can be transferred to the supply air heating capacity of air preheater 2.

[0214] When using Figure 1In the implementation structure, that is, the bypass damper 4-1 is connected in series on the bypass air duct 4-0, the bypass damper 4-2 can be opened or opened wide to allow a part of the hot primary air from the air preheater primary air outlet 2-4-1 to bypass to the boiler supply air inlet 1-2; it is also possible to increase the supply air heating capacity of the air preheater 2 (such as increasing the heat exchange area for heating the supply air) and reduce the primary air heating capacity of the air preheater 2 (such as reducing the heat exchange area for heating the primary air) when the heat exchange capacity of the air preheater is constant, so as to make full use of the heat exchange capacity of the air preheater 2. The bypass damper 4-1 is used as a drying adjustment means when the humidity of the coal changes: when the coal is relatively wet, the bypass damper 4-1 is closed or closed to reduce the hot primary air from the air preheater primary air outlet 2-4-1 to bypass to the air preheater supply air outlet 2-4-2 and the boiler. The bypass hot primary air volume in the air supply channel between the furnace air supply inlet 1-2 (the hot primary air volume entering the furnace) increases the hot primary air volume entering the pulverizer 3, and correspondingly reduces the cold primary air volume entering the pulverizer 3, so as to increase the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the pulverized coal outlet of the pulverizer; when the coal is relatively dry, open the bypass damper 4-1, increase the hot primary air volume from the air preheater primary air outlet 2-4-1 to bypass the bypass hot primary air volume in the air supply channel between the air preheater air supply outlet 2-4-2 and the boiler air supply inlet 1-2 (the hot primary air volume entering the furnace), reduce the hot primary air volume entering the pulverizer 3, and correspondingly increase the cold primary air volume entering the pulverizer 3, so as to reduce the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the pulverized coal outlet of the pulverizer.

[0215] When using Figure 1-1In the embodiment structure, that is, the bypass fan 4-2 is connected in series to the bypass air duct 4-0. Under the condition that the heat exchange capacity of the air preheater is constant, the air supply heating capacity of the air preheater 2 is increased (such as increasing the heat exchange area for heating the air supply), and the primary air heating capacity of the air preheater 2 is reduced (such as reducing the heat exchange area for heating the primary air), so as to make full use of the heat exchange capacity of the air preheater 2. The bypass fan 4-2 is used as a drying adjustment means when the humidity of the coal changes: when the coal is relatively wet, the bypass fan 4-2 is turned on or turned on, and the higher temperature air from the air preheater air outlet 2-4-2 is pumped into the air preheater primary air outlet 2-4-2 through the bypass air duct 4-0 and the bypass fan 4-2. In the hot primary air channel between 4-1 and the primary air inlet 3-2 of the coal mill or the primary air inlet 3-2 of the coal mill, the amount of hot primary air entering the coal mill 3 is increased, and the amount of cold primary air entering the coal mill 3 is correspondingly reduced to increase the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the coal mill coal powder outlet; when the coal is relatively dry, the bypass fan 4-2 is turned down or stopped, the bypass flow of the air supply from the air preheater supply air outlet 2-4-2 to the primary air inlet 3-2 of the coal mill is reduced, the amount of hot primary air entering the coal mill 3 is reduced, and the amount of cold primary air entering the coal mill 3 is correspondingly increased to reduce the drying heat of the warm primary air on the coal and maintain the temperature of the air-powder mixture at the coal mill coal powder outlet.

[0216] The supply air heating medium water and primary air heating medium water from the flue heat exchanger 22 heat the supply air flowing through the supply air heater 9 and the primary air flowing through the primary air heater 10, respectively. The heated supply air and primary air are further heated by the air preheater 2 before being respectively fed into the furnace of the boiler 1 and the coal mill 3. Due to the high heat exchange efficiency of the air preheater 2, the temperature difference (terminal difference) between the flue gas temperature at the air preheater flue gas inlet 2-1, the supply air temperature at the air preheater supply air outlet 2-4-2, and the primary air temperature at the air preheater primary air outlet 2-4-1 is very small. Generally, increases in the supply air temperature at the air preheater supply air inlet 2-3-2 and the primary air temperature at the air preheater primary air inlet 2-3-1 result in relatively small increases in the supply air temperature at the air preheater supply air outlet 2-4-2 and the primary air temperature at the air preheater primary air outlet 2-4-1. Most of this energy is converted into thermal energy in the flue gas at the air preheater flue gas outlet. Since the flue gas volume remains unchanged, this energy is converted into an equivalent increase in flue gas temperature, thereby converting the excess low-grade flue gas waste heat recovered after the installation of the flue heat exchanger 22 into higher-grade flue gas heat in the flue gas at the air preheater flue gas outlet 2-2. To convert this heat into higher-temperature, higher-grade thermal energy, the bypass flue gas flow rate entering the flue gas duct of the bypass economizer 15 can be increased. While the supply air temperature at air preheater supply air outlet 2-4-2 remains unchanged, the increased flue gas heat volume diverted to the bypass economizer 15 flue gas duct is equivalent to the flue gas waste heat recovered when the flue heat exchanger is installed versus when it is not, but at the flue gas temperature at air preheater flue gas inlet 2-1. Generally, the flue gas temperature at air preheater flue gas outlet 2-2 is approximately 120°C, while the flue gas temperature at air preheater flue gas inlet 2-1 is approximately 300°C. With these heat values ​​being equal, the temperature and quality of the thermal energy are significantly improved, and the working water temperature at bypass economizer working water outlet 15-4 can also be increased. Therefore, through flue heat exchanger 22, supply air heater 9, primary air heater 10, air preheater 2, and bypass economizer 15, the low-temperature flue gas waste heat from air preheater flue gas outlet 2-2 can be converted into high-temperature thermal energy of equal heat value (ignoring secondary factors such as heat dissipation), significantly improving its utilization value and efficiency.

[0217] As the flue gas temperature at the flue gas outlet 2-2 of the air preheater increases, that is, the flue gas temperature at the flue gas inlet 22-1 of the flue heat exchanger increases, the primary air heat medium water at the primary air heat medium water outlet 22-4-1 of the flue heat exchanger will also increase, and the temperature of the cold primary air entering the coal mill 3 will increase. When the amount of coal and its humidity are constant, the amount of hot primary air entering the coal mill 3 will decrease, and the amount of cold primary air entering the coal mill 3 will increase. The primary air heating capacity of the air preheater 2 (such as the primary air heat exchange area) can be further transferred to the supply air heating capacity of the air preheater 2, thereby further improving the heat exchange efficiency of the air preheater 2.

[0218] Since the supply air and primary air temperatures entering the air preheater have been increased, this system can effectively address persistent issues such as low-temperature corrosion at the air preheater's cold end and ammonium bisulfate deposition and solidification corrosion. Currently, most boiler units are equipped with a denitrification system. When the boiler load and flue gas temperature are low, the denitrification system's efficiency decreases, necessitating increased ammonia injection. This causes excess ammonia to react with sulfides in the flue gas to form ammonium bisulfate. As the flue gas temperature gradually decreases in the air preheater, the ammonium bisulfate transforms from a gaseous state into a mucus-like liquid, which adheres to dust. When the temperature drops below the solidification point of ammonium bisulfate, it deposits on the heat exchange components of the air preheater, causing corrosion and blockage, seriously impacting its operation. This system raises the supply air temperature at the air preheater's supply air inlet 2-3-2, effectively preventing corrosion and blockage caused by ammonium bisulfate. This system can improve the flexibility of thermal power plants, reduce the minimum stable load of units, and enhance peak-shaving capabilities.

[0219] Figure 2-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0220] like Figure 2-1 As shown, Figure 2 The difference is that the flue heat exchanger's supply air heat medium water inlet 22-3-2 and the flue heat exchanger's primary air heat medium water inlet 22-3-1 are combined into flue heat exchanger heat medium water inlet 22-3; the flue heat exchanger's supply air heat medium water outlet 22-4-2 and the flue heat exchanger's primary air heat medium water outlet 22-4-1 are combined into flue heat exchanger heat medium water outlet 22-4; the flue heat exchanger heat medium water outlet 22-4 is directly or indirectly connected to both the supply air heater heat medium water inlet 9-3 and the primary air heater heat medium water inlet 10-3; and the supply air heater heat medium water outlet 9-4 and the primary air heater heat medium water outlet 10-4 are both directly or indirectly connected to the flue heat exchanger heat medium water inlet 22-3.

[0221] The working process is as follows: Figure 2 The difference is that the heat medium water for supply air from the heat medium water outlet 9-4 of the supply air heater and the heat medium water for primary air from the heat medium water outlet 10-4 of the primary air heater are both sent to the heat medium water inlet 22-3 of the flue heat exchanger, and after being heated by the flue gas, are sent to the heat medium water outlet 22-4 of the flue heat exchanger to heat the supply air and the primary air heater 10 respectively. The rest of the working process is the same as Figure 2 Basically the same, no further details.

[0222] Figure 2-1 and Figure 2 Relatively simple system.

[0223] Figure 2-2 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0224] like Figure 2-2 As shown, Figure 2-1 The difference is that the flue gas channel of the flue heat exchanger 22 is connected in series on the flue gas channel between the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 and the dust collector inlet 60-1; the flue heat exchanger flue gas inlet 22-1 is directly or indirectly connected to the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 at the same time; the flue heat exchanger flue gas outlet 22-2 is directly or indirectly connected to the dust collector inlet 60-1.

[0225] The working process is as follows:

[0226] The flue gas from the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 enters the flue heat exchanger 22 flue gas channel through the flue heat exchanger flue gas inlet 22-1, exchanges heat with the heat medium water (including the supply air heat medium water and the primary air heat medium water) flowing through the flue heat exchanger, and then flows out of the flue heat exchanger 22 through the flue heat exchanger flue gas outlet 22-2, and then enters the dust collector 60 through the dust collector inlet 60-1 for dust removal. The other working processes are the same. Figure 2-1 , no more details.

[0227] This embodiment and Figure 2-1 In comparison, the amount of flue gas flowing through the flue heat exchanger 22 is large, which can transfer more heat to the supply air and primary air. The supply air temperature and primary air temperature entering the air preheater 2 can be higher, the bypass flue gas volume can be larger, and the flue gas waste heat recovery efficiency is higher.

[0228] Figure 2-3 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0229] like Figure 2-3 As shown, Figure 2-2 The difference is that the flue gas channel of the flue heat exchanger 22 is connected in series to the flue gas channel between the dust collector 60 and the flue gas inlet 6-5 of the desulfurization tower; the flue gas inlet 22-1 of the flue heat exchanger is directly or indirectly connected to the dust collector outlet 60-2; and the flue gas outlet 22-2 of the flue heat exchanger is directly or indirectly connected to the flue gas inlet 6-5 of the desulfurization tower.

[0230] The working process is as follows:

[0231] The flue gas from the dust collector outlet 60-2 enters the flue gas channel of the flue heat exchanger 22 directly or indirectly through other equipment (such as induced draft fan) through the flue heat exchanger flue gas inlet 22-1, exchanges heat with the heat medium water (including the supply air heat medium water and the primary air heat medium water) flowing through the flue heat exchanger, and then flows out of the flue heat exchanger 22 through the flue heat exchanger flue gas outlet 22-2, and enters the desulfurization tower 6 for desulfurization directly or through other equipment (such as induced draft fan) through the desulfurization tower flue gas inlet 6-5. The other working processes are the same. Figure 2-2 , no more details.

[0232] This embodiment and Figure 2-2 In comparison, the flue gas enters the flue heat exchanger 22 after dust removal, and the dust content of the flue gas is reduced, which can reduce the wear of the flue gas heat exchanger by the flue gas.

[0233] Optionally, a heat medium water circulation pump (not shown in the figure) is connected in series to the heat medium water channel directly or indirectly connected to the heat medium water inlet 22-3 of the flue heat exchanger or the heat medium water outlet 22-4 of the flue heat exchanger.

[0234] Optionally, the flue heat exchanger 22 includes a primary air flue heat exchanger and a supply air flue heat exchanger; the primary air flue heat exchanger is provided with a primary air flue heat exchanger flue gas inlet, a primary air flue heat exchanger flue gas outlet, a flue heat exchanger primary air heat medium water inlet, and a flue heat exchanger primary air heat medium water outlet; the supply air flue heat exchanger is provided with a supply air flue heat exchanger flue gas inlet, a supply air flue heat exchanger flue gas outlet, a flue heat exchanger supply air heat medium water inlet, and a flue heat exchanger supply air heat medium water outlet; the primary air flue heat exchanger flue gas inlet and the supply air flue heat exchanger flue gas inlet together constitute the flue heat exchanger flue gas inlet; the primary air flue heat exchanger smoke gas outlet and the supply air flue heat exchanger smoke gas outlet together constitute the flue heat exchanger smoke gas outlet; (not shown in the figure). This method is to divide the flue of the flue heat exchanger 22 into a primary air flue heat exchanger flue gas channel and a supply air flue heat exchanger flue gas channel. Figure 2 Same, no more details.

[0235] Optionally, the flue heat exchanger 22, the primary air flue heat exchanger, and the supply air flue heat exchanger are all heating sections (evaporation sections) of a separate heat pipe heat exchanger, and the primary air heater and the supply air heater are all heat releasing sections (condensation sections) of a separate heat pipe heat exchanger. The heating section is arranged in the flue gas channel of the flue heat exchanger (primary air flue heat exchanger, supply air flue heat exchanger), and the heat releasing section is arranged in the supply air channel (primary air channel) of the supply air heater (primary air heater). After the heating section absorbs the heat of the flue gas, the medium in the heat pipe evaporates and then rises to the heat releasing section located in the supply air channel (primary air channel). The intermediate medium transfers the heat to the supply air (primary air) and condenses into a liquid. Then, under the action of gravity or other forces, it returns to the heating section and continues to absorb the heat of the flue gas. In this cycle, the heat of the flue gas is continuously transferred to the supply air (primary air) through the heat pipe heat exchanger. The basic structural principle of the separate heat pipe heat exchanger belongs to conventional technology and will not be described in detail.

[0236] Figure 3 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0237] like Figure 3 As shown, in Figure 1 On the basis, a low-temperature air preheater 23 is further provided; the low-temperature air preheater 23 is provided with a low-temperature air preheater flue gas inlet 23-1, a low-temperature air preheater flue gas outlet 23-2, a low-temperature air preheater air supply inlet 23-3-2, a low-temperature air preheater air supply outlet 23-4-2, a low-temperature air preheater primary air inlet 23-3-1, and a low-temperature air preheater primary air outlet 23-4-1;

[0238] The low-temperature air preheater air supply inlet 23-3-2 is directly or indirectly connected to the blower outlet 8-2; the low-temperature air preheater air supply outlet 23-4-2 is directly or indirectly connected to the air preheater air supply inlet 2-3-2; the low-temperature air preheater primary air inlet 23-3-1 is directly or indirectly connected to the primary fan outlet 5-2; the low-temperature air preheater primary air outlet 23-4-1 is directly or indirectly connected to the air preheater primary air inlet 2-3-1 and the coal mill primary air inlet 3-2;

[0239] The flue gas channel of the low-temperature air preheater 23 is connected in series on the flue gas channel between the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 and the dust collector inlet 60-2; the low-temperature air preheater flue gas inlet 23-1 is directly or indirectly connected to the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 at the same time; the low-temperature air preheater flue gas outlet 23-2 is directly or indirectly connected to the dust collector inlet 60-1.

[0240] The working process is as follows:

[0241] The flue gas from the air preheater flue gas outlet 2-2 and the bypass economizer flue gas outlet 15-2 enters the flue gas channel of the low-temperature air preheater 23 through the low-temperature air preheater flue gas inlet 23-1, the supply air from the blower outlet 8-2 enters the supply air channel of the low-temperature air preheater 23 through the low-temperature air preheater supply air inlet 23-3-2, and the primary air from the primary fan outlet 5-2 enters the primary air channel of the low-temperature air preheater 23 through the low-temperature air preheater primary air inlet 23-3-1. In the low-temperature air preheater 23, the flue gas is heat-exchanged with the supply air and the primary air respectively and then flows out of the low-temperature air preheater 23 through the low-temperature air preheater flue gas outlet 23-2, and then enters the dust collector 60 for dust removal. The other working processes are the same. Figure 2-2 , no more details.

[0242] This embodiment and Figure 2-2 Compared with the implementation methods, the low-temperature air preheater replaces the flue heat exchanger, supply air heater and primary air heater. The low-temperature air preheater realizes the one-step heat exchange between flue gas, supply air and primary air to complete the flue gas waste heat recovery and directly heat the supply air and primary air. The heat exchange end difference is small, the system is simple, there is no problem of heat medium water leakage, the equipment is highly reliable and adaptable. Figure 2-2 The implementation method is that the flue gas heats the heat medium water, and the heat medium water then heats the supply air and primary air, which is a two-step heat exchange. The flue heat exchanger, supply air heater, and primary air heater are all gas-water heat exchangers. The heat medium water leaked after the heat exchange element leaks has a great impact on the flue gas system, the supply air system, and the primary air system.

[0243] Figure 3-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0244] like Figure 3-1 As shown, Figure 3 The difference is that the flue gas channel of the low-temperature air preheater 23 is connected in series on the flue gas channel between the air preheater flue gas outlet 2-2 and the dust collector inlet 60-1; the low-temperature air preheater flue gas inlet 23-1 is directly or indirectly connected to the air preheater flue gas outlet 2-2; the low-temperature air preheater flue gas outlet 23-2 is directly or indirectly connected to the dust collector inlet 60-1.

[0245] The working process is as follows:

[0246] The flue gas outlet 2-2 of the air preheater enters the flue gas channel of the low-temperature air preheater 23 through the flue gas inlet 23-1 of the low-temperature air preheater. The supply air from the blower outlet 8-2 enters the supply air channel of the low-temperature air preheater 23 through the supply air inlet 23-3-2 of the low-temperature air preheater. The primary air from the primary fan outlet 5-2 enters the primary air channel of the low-temperature air preheater 23 through the primary air inlet 23-3-1 of the low-temperature air preheater. In the low-temperature air preheater 23, the flue gas is heat-exchanged with the supply air and the primary air respectively and then flows out of the low-temperature air preheater 23 through the flue gas outlet 23-2 of the low-temperature air preheater. It then merges with the flue gas from the flue gas outlet 15-2 of the bypass economizer and enters the dust collector 60 for dust removal. The other working processes are the same. Figure 3 , no more details.

[0247] Figure 3-2 It is a structural schematic diagram of an implementation method of a low-temperature air preheater in a boiler flue gas waste heat recovery and utilization system of the utility model.

[0248] like Figure 3-2 As shown, the low-temperature air preheater 23 is composed of a primary air low-temperature air preheater 23a and a supply air low-temperature air preheater 23b; the primary air low-temperature air preheater 23a is provided with a primary air low-temperature air preheater flue gas inlet 23a-1, a primary air low-temperature air preheater flue gas outlet 23a-2, a low-temperature air preheater primary air inlet 23-3-1, and a low-temperature air preheater primary air outlet 23-4-1; the supply air low-temperature air preheater 23b is provided with a supply air low-temperature air preheater flue gas inlet 23b-1, a supply air low-temperature air preheater flue gas outlet 23a-2, a low-temperature air preheater primary air inlet 23-3-1, and a low-temperature air preheater primary air outlet 23-4-1. Low-temperature air preheater flue gas outlet 23b-2, low-temperature air preheater air supply inlet 23-3-2, low-temperature air preheater air supply outlet 23-4-2; the primary air low-temperature air preheater flue gas inlet 23a-1 and the air supply low-temperature air preheater flue gas inlet 23b-1 are both connected to the low-temperature air preheater flue gas inlet 23-1; the primary air low-temperature air preheater flue gas outlet 23a-2 and the air supply low-temperature air preheater flue gas outlet 23b-2 are both connected to the low-temperature preheater flue gas outlet 23-2.

[0249] The working process is as follows:

[0250] The flue gas entering the flue gas inlet 23-1 of the low-temperature air preheater, part of the flue gas enters the flue gas channel of the primary air low-temperature air preheater 23a through the flue gas inlet 23a-1 of the primary air low-temperature air preheater, the primary air from the primary fan 5 enters the primary air channel of the primary air low-temperature air preheater through the primary air inlet 23a-3-1 of the low-temperature air preheater, the flue gas in the primary air low-temperature preheater 23a heats the primary air and then cools it down, then flows out of the primary air low-temperature air preheater 23a through the flue gas outlet 23a-2 of the primary air low-temperature air preheater, the primary air is heated by the flue gas and flows out of the primary air low-temperature air preheater 23a, i.e. the low-temperature air preheater 23, through the primary air outlet 23-4-1 of the low-temperature air preheater; the other part of the flue gas enters the flue gas inlet of the supply air low-temperature air preheater The air from the blower 8 enters the air supply channel of the low-temperature air preheater 23b through the air supply inlet 23-3-2 of the low-temperature air preheater. The flue gas in the low-temperature air preheater 23b heats the air and cools it down. Then, it flows out of the low-temperature air preheater 23b through the flue gas outlet 23b-2 of the low-temperature air preheater. After being heated by the flue gas, the air flows out of the low-temperature air preheater 23b through the air supply air outlet 23-4-2, that is, the low-temperature air preheater 23. The flue gas from the primary air low-temperature air preheater flue gas outlet 23a-2 and the flue gas from the low-temperature air preheater flue gas outlet 23b-2 merge and flow out of the low-temperature air preheater through the low-temperature air preheater flue gas outlet 23-2.

[0251] Low temperature air preheater Figure 3-2 The advantage of this implementation method is that it is convenient for on-site arrangement.

[0252] Optionally, the low-temperature air preheater 23 may be composed of one or more heat exchange modules (not shown in the figure);

[0253] Optionally, the low-temperature air preheater 23, the primary air low-temperature air preheater 23a, and the supply air low-temperature air preheater 23b are heat pipe heat exchangers. The heat pipe heat exchanger is provided with a plurality of heat pipes, and the heat pipes include a heat pipe heating section and a heat pipe heat release section. After the heat pipe heating section absorbs the heat of the flue gas, the medium in the heat pipe evaporates and then rises to the heat pipe heat release section. The intermediate medium transfers the heat to the supply air / primary air and condenses into liquid, and then returns to the heat pipe heating section to continue absorbing the heat of the flue gas. In this cycle, the flue gas heat is continuously transferred to the supply air / primary air through the heat pipe heat exchanger. The basic principle and structure of the heat pipe heat exchanger belong to conventional technology and will not be described in detail.

[0254] As another embodiment, the low-temperature air preheater 23 includes one or more supply air rotary heat exchangers 23d and one or more primary air rotary heat exchangers 23c.

[0255] Figure 4-1 This is a structural diagram of an implementation method of a primary air rotary cage heat exchanger.

[0256] Figure 4-1-1yes Figure 4-1 The diagram shows a cross-sectional diagram of the primary air rotary cage heat exchanger in the AA direction.

[0257] Figure 4-1-2 yes Figure 4-1 A vertical cross-section through the axis of the primary air rotary cage heat exchanger shown.

[0258] Figure 4-1-3 yes Figure 4-1 The cross-sectional schematic diagram of the primary air rotary cage heat exchanger in the BB direction is shown.

[0259] Figure 4-1-4 It is a three-dimensional structural schematic diagram of an implementation method of a primary air rotary cage heat exchanger core in a primary air rotary cage heat exchanger.

[0260] Figure 4-1-5 It is a three-dimensional structural schematic diagram of an implementation method of the front end plate of the primary air cage heat exchanger core.

[0261] Figure 4-1-6 It is a three-dimensional structural schematic diagram of an implementation method of the rear end plate of the primary air cage heat exchanger core.

[0262] Figure 4-2 It is a structural diagram of an implementation method of an air supply rotary cage heat exchanger.

[0263] Figure 4-2-1 yes Figure 4-2 The schematic cross-sectional view of the air supply rotary heat exchanger in the AA direction is shown.

[0264] Figure 4-2-2 yes Figure 4-2 A vertical cross-section through the axis of the air supply rotary heat exchanger is shown.

[0265] Figure 4-2-3 yes Figure 4-2 The cross-sectional schematic diagram of the air supply rotary cage heat exchanger in the BB direction is shown.

[0266] Figure 4-2-4 It is a three-dimensional structural diagram of an embodiment of an air supply rotary heat exchanger core in an air supply rotary heat exchanger.

[0267] Figure 4-2-5 It is a three-dimensional structural diagram of an embodiment of a front end plate of an air supply cage heat exchanger core.

[0268] Figure 4-2-6 It is a three-dimensional structural diagram of an embodiment of the rear end plate of the air supply cage heat exchanger core.

[0269] like Figure 4-2 、 Figure 4-2-1 、 Figure 4-2-2 、 Figure 4-2-3 、 Figure 4-2-4 、 Figure 4-2-5 、 Figure 4-2-6As shown, the air supply cage heat exchanger 23d includes an air supply cage heat exchanger shell 23d-0; a rotatable air supply cage heat exchanger core 23d-5 is provided in the air supply cage heat exchanger shell 23d-0; the air supply cage heat exchanger core 23d-5 includes an air supply cage heat exchanger core front end plate 23d-3-1 (which can be circular or elliptical), an air supply cage heat exchanger core rear end plate 23d-4-1 (which can be circular or elliptical), and a plurality of air supply cage heat exchanger core heat exchange tubes 23d-5-1; the air supply cage heat exchanger core front end plate 23d-3-1 is provided with a plurality of (through the core front end plate The air supply cage heat exchanger core front end plate through hole 23d-3-1-1 is provided on the air supply cage heat exchanger core rear end plate 23d-4-1, and the air supply cage heat exchanger core rear end plate through hole 23d-4-1-1 is provided with a plurality of air supply cage heat exchanger core rear end plate through holes 23d-4-1-1 (penetrating the core rear end plate) (the air supply cage heat exchanger core rear end plate through holes 23d-4-1-1 are equal in number to the air supply cage heat exchanger core front end plate through holes 23d-3-1-1, and are basically symmetrical, and there may be a certain error in actual application); the two ends of each of the air supply cage heat exchanger core heat exchange tubes 23d-5-1 are respectively connected to the air supply cage heat exchanger core. The through hole 23d-3-1-1 of the front end plate of the air supply cage heat exchanger core and its corresponding through hole 23d-4-1-1 of the rear end plate of the air supply cage heat exchanger core are connected (including one end of the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core penetrates or passes through or docks with the through hole 23d-3-1-1 of the front end plate of the air supply cage heat exchanger core, and the other end of the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core penetrates or passes through or docks with the through hole 23d-4-1-1 of the rear end plate of the air supply cage heat exchanger core, the same below); the center of the front end plate of the air supply cage heat exchanger core and the center of the rear end plate of the cage heat exchanger core are connected as the center The center line of the air supply cage heat exchanger core 23d-5 can rotate with the center line as the axis of the air supply cage heat exchanger core; the internal flow channels of all the air supply cage heat exchanger core heat exchange tubes 23d-5-1 constitute the air supply cage heat exchanger core air supply channel 23d-5-2; the flow channel formed by the front end plate 23d-3-1 of the air supply cage heat exchanger core, the rear end plate 23d-4-1 of the air supply cage heat exchanger core, the outer surface of each of the air supply cage heat exchanger core heat exchange tubes 23d-5-1 and the air supply cage heat exchanger shell 23d-0 is the air supply cage heat exchanger core smoke channel 23d-5-3.An air supply cage heat exchanger smoke inlet 23d-1 is provided on one side of the air supply cage heat exchanger shell 23d-0 at the air supply cage heat exchanger core smoke channel 23d-5-3, and an air supply cage heat exchanger smoke outlet 23d-2 is provided on the opposite side of the above-mentioned side of the air supply cage heat exchanger shell 23d-0 at the air supply cage heat exchanger core smoke channel 23d-5-3 (i.e., the opposite side of the side where the air supply cage heat exchanger smoke inlet 23d-1 is located); the front of the air supply cage heat exchanger core An air supply cage heat exchanger air supply inlet blower 23d-3-2 is provided between the end plate 23d-3-1 and the front end of the air supply cage heat exchanger shell 23d-0; an air supply cage heat exchanger air supply inlet 23d-3 is provided on the air supply cage heat exchanger shell 23d-0 at the air supply cage heat exchanger air supply inlet blower 23d-3-2; an air supply cage heat exchanger air supply outlet blower 23d-4 is provided between the rear end plate 23d-4-1 of the air supply cage heat exchanger core and the rear end of the air supply cage heat exchanger shell 23d-0. d-4-2; the air supply cage heat exchanger shell 23d-0 at the air supply cage heat exchanger air outlet wind box 23d-4-2 is provided with an air supply cage heat exchanger air outlet 23d-4; the air supply cage heat exchanger core air supply channel 23d-5-2 is directly or indirectly connected to the air supply cage heat exchanger air inlet 23d-3 through the air supply cage heat exchanger core front end plate 23d-3-1 and the air supply cage heat exchanger air inlet wind box 23d-3-2; the air supply cage heat exchanger core The air supply channel 23d-5-2 is directly or indirectly connected to the air supply cage heat exchanger air outlet 23d-4 through the rear end plate 23d-4-1 of the air supply cage heat exchanger core, the air supply cage heat exchanger air outlet wind box 23d-4-2 and the air supply cage heat exchanger air outlet 23d-4 in sequence; all the air supply cage heat exchanger air inlets 23d-3 together constitute the low-temperature air preheater air inlet 23-3-2; all the air supply cage heat exchanger air outlets 23d-4 together constitute the low-temperature air preheater air outlet 23-4-2;.

[0270] like Figure 4-1 、 Figure 4-1-1 、 Figure 4-1-2 、 Figure 4-1-3 、 Figure 4-1-4 、 Figure 4-1-5 、 Figure 4-1-6As shown, the primary air rotary cage heat exchanger 23c includes a primary air rotary cage heat exchanger shell 23c-0; a rotatable primary air rotary cage heat exchanger core 23c-5 is provided in the primary air rotary cage heat exchanger shell 23c-0; the primary air rotary cage heat exchanger core 23c-5 includes a primary air rotary cage heat exchanger core front end plate 23c-3-1 (which can be circular or elliptical), a primary air rotary cage heat exchanger core rear end plate 23c-4-1 (which can be circular or elliptical), and a plurality of primary air rotary cage heat exchanger core heat exchange tubes 23c-5-1; the primary air rotary cage heat exchanger core front end plate 23c-3-1 is provided with a plurality of (through the core front end plate The through holes 23c-3-1-1 of the front end plate of the primary air rotary cage heat exchanger core are respectively provided on the rear end plate 23c-4-1 of the primary air rotary cage heat exchanger core, and the through holes 23c-4-1-1 of the rear end plate of the primary air rotary cage heat exchanger core are respectively provided on the rear end plate 23c-4-1 of the primary air rotary cage heat exchanger core (the number of the through holes 23c-4-1-1 of the rear end plate of the primary air rotary cage heat exchanger core is equal to that of the through holes 23c-3-1-1 of the front end plate of the primary air rotary cage heat exchanger core, and they are basically symmetrical, and there may be a certain error in actual application); the two ends of each of the primary air rotary cage heat exchanger core heat exchange tubes 23c-5-1 are respectively connected to the front end plate of the primary air rotary cage heat exchanger core. The end plate through hole 23c-3-1-1 and its corresponding primary air rotary cage heat exchanger core rear end plate through hole 23c-4-1-1 are connected (including one end of the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 penetrating or passing through or docking with the primary air rotary cage heat exchanger core front end plate through hole 23c-3-1-1, and the other end of the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 penetrating or passing through or docking with the primary air rotary cage heat exchanger core rear end plate through hole 23c-4-1-1, the same below); with the center of the primary air rotary cage heat exchanger core front end plate and the center of the rotary cage heat exchanger core rear end plate as the center line, The primary air rotary cage heat exchanger core 23c-5 can rotate with the center line as the axis of the primary air rotary cage heat exchanger core; the inner flow channels of multiple primary air rotary cage heat exchanger core heat exchange tubes 23c-5-1 constitute the primary air rotary cage heat exchanger core primary air channel 23c-5-2; the flow channel formed between the primary air rotary cage heat exchanger core front end plate 23c-3-1, the primary air rotary cage heat exchanger core rear end plate 23c-4-1, the outer surface of multiple primary air rotary cage heat exchanger core heat exchange tubes 23c-5-1 and the primary air rotary cage heat exchanger outer shell 23c-0 is the primary air rotary cage heat exchanger core smoke channel 23c-5-3.A primary air rotary cage heat exchanger smoke inlet 23c-1 is provided on one side of the primary air rotary cage heat exchanger shell 23c-0 at the primary air rotary cage heat exchanger core smoke channel 23c-5-3, and a primary air rotary cage heat exchanger smoke outlet 23c-2 is provided on the opposite side of the above-mentioned side of the primary air rotary cage heat exchanger shell 23c-0 at the primary air rotary cage heat exchanger core smoke channel 23c-5-3 (i.e., the opposite side of the side where the primary air rotary cage heat exchanger smoke inlet 23c-1 is located); the primary air rotary cage heat exchanger core front end plate 23c-1 is provided with a primary air rotary cage heat exchanger smoke outlet 23c-2. A primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger is provided between 3c-3-1 and the front end of the primary air rotary cage heat exchanger shell 23c-0; a primary air inlet 23c-3 of the primary air rotary cage heat exchanger is provided on the primary air rotary cage heat exchanger shell 23c-0 at the primary air inlet wind box 23c-3-2; a primary air outlet wind box 23c- 4-2; a primary air rotary cage heat exchanger primary air outlet 23c-4 is provided on the primary air rotary cage heat exchanger shell 23c-0 at the primary air outlet wind box 23c-4-2 of the primary air rotary cage heat exchanger; the primary air channel 23c-5-2 of the primary air rotary cage heat exchanger core is directly or indirectly connected to the primary air inlet 23c-3 of the primary air rotary cage heat exchanger core through the front end plate 23c-3-1 of the primary air rotary cage heat exchanger core and the primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger; the primary air rotary cage heat exchanger core The primary air channel 23c-5-2 is directly or indirectly connected to the primary air outlet 23c-4 of the primary air rotary cage heat exchanger through the rear end plate 23c-4-1 of the primary air rotary cage heat exchanger core, the primary air outlet wind box 23c-4-2 of the primary air rotary cage heat exchanger; all the primary air inlets 23c-3 of the primary air rotary cage heat exchanger together constitute the low-temperature air preheater primary air inlet 23-3-1; all the primary air rotary cage heat exchanger primary air outlets 23c-4 are combined as the low-temperature air preheater primary air outlet 23-4-1;.

[0271] All the air supply cage heat exchanger flue gas inlets 23d-1 and all the primary air cage heat exchanger flue gas inlets 23c-1 together constitute the low-temperature air preheater flue gas inlet 23-1; all the air supply cage heat exchanger flue gas outlets 23d-2 and all the primary air cage heat exchanger flue gas outlets 23c-2 together constitute the low-temperature air preheater flue gas outlet 23-2.

[0272] The working process is as follows:

[0273] The flue gas with higher temperature enters the flue gas channel 23d-5-3 of the air supply cage heat exchanger core through the flue gas inlet 23d-1 of the air supply cage heat exchanger, and the supply air with lower temperature passes through the air supply cage heat exchanger air inlet 23d-3 and the air supply cage heat exchanger air inlet wind box 23d-3-2, passes through the front end plate 23d-3-1 of the air supply cage heat exchanger core and enters the air supply cage heat exchanger core. In the channel 23d-5-2, the flue gas outside the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core transfers heat to the air supply inside the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core. After the flue gas cools down through heat exchange, it flows out of the flue gas channel 23d-5-3 of the air supply cage heat exchanger core and flows out of the air supply cage heat exchanger 23d through the flue gas outlet 23d-2 of the air supply cage heat exchanger. After the air heats up through heat exchange, it flows out of the flue gas channel 23d-5-3 of the air supply cage heat exchanger core and flows out of the flue gas outlet 23d-2 of the air supply cage heat exchanger 23d. The air flows out of the air supply cage heat exchanger core heat exchange tube 23d-5-1, that is, the air supply cage heat exchanger core air supply channel 23d-5-, and flows out of the air supply cage heat exchanger 23d through the air supply cage heat exchanger air outlet wind box 23d-4-2 and the air supply cage heat exchanger air outlet 23d-4; the air supply cage heat exchanger core heat exchange tube 23d-5-1 with a higher pipe wall temperature that absorbs flue gas heat in the high-temperature flue gas area rotates to the area with a lower flue gas temperature as the air supply cage heat exchanger core 23d-5 rotates and continues to exchange heat and cool down with the air flowing in its pipe; at the same time, the air supply cage heat exchanger core heat exchange tube 23d-5-1 with a lower pipe wall temperature that is in the low-temperature flue gas area rotates to the area with a higher flue gas temperature as the air supply cage heat exchanger core 23d-5 rotates to exchange heat with the flue gas; they rotate in sequence and repeat. All the air supply from the air supply inlet 23d-3 of the air supply rotary heat exchanger comes from the low-temperature air preheater air supply inlet 23-3-2; all the air supply from the air supply outlet 23d-4 of the air supply rotary heat exchanger is combined and flows out of the low-temperature air preheater 23 through the low-temperature air preheater air supply outlet 23-4-2;

[0274] The flue gas with higher temperature enters the flue gas channel 23c-5-3 of the primary air rotary cage heat exchanger core through the flue gas inlet 23c-1 of the primary air rotary cage heat exchanger, and the primary air with lower temperature passes through the primary air inlet 23c-3 of the primary air rotary cage heat exchanger and the primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger, and passes through the front end plate 23c-3-1 of the primary air rotary cage heat exchanger core and enters the primary air rotary cage heat exchanger core. In the secondary air channel 23c-5-2, the flue gas outside the primary air cage heat exchanger core heat exchange tube 23c-5-1 transfers heat to the primary air inside the primary air cage heat exchanger core heat exchange tube 23c-5-1. After the flue gas cools down through heat exchange, it flows out of the primary air cage heat exchanger core flue gas channel 23c-5-3 and flows out of the primary air cage heat exchanger 23c through the primary air cage heat exchanger flue gas outlet 23c-2. After the primary air heats up through heat exchange, The air flows out of the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1, that is, the primary air channel 23c-5-2 of the primary air rotary cage heat exchanger core, and flows out of the primary air rotary cage heat exchanger 23c successively through the primary air outlet wind box 23c-4-2 and the primary air outlet 23c-4 of the primary air rotary cage heat exchanger; the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 with a higher tube wall temperature that absorbs flue gas heat in the high-temperature flue gas area rotates to the area with a lower flue gas temperature as the primary air rotary cage heat exchanger core 23c-5 rotates and continues to exchange heat and cool down with the primary air flowing in the tube; at the same time, the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 with a lower tube wall temperature that is in the low-temperature flue gas area rotates to the area with a higher flue gas temperature as the primary air rotary cage heat exchanger core 23c-5 rotates to exchange heat with the flue gas; they rotate in sequence and repeat. All the primary air from the primary air inlet 23c-3 of the primary air rotary heat exchanger comes from the primary air inlet 23-3-1 of the low-temperature air preheater; all the primary air from the primary air outlet 23c-4 of the primary air rotary heat exchanger merges and flows out of the low-temperature air preheater 23 through the primary air outlet 23-4-1 of the low-temperature air preheater;

[0275] All the flue gases at the flue gas inlet 23d-1 of the air supply rotary heat exchanger and all the flue gases at the flue gas inlet 23c-1 of the primary air rotary heat exchanger come from the low-temperature air preheater flue gas inlet 23-1; all the flue gases at the flue gas outlet 23d-2 of the air supply rotary heat exchanger and all the flue gases at the flue gas outlet 23c-2 of the primary air rotary heat exchanger are combined and flow out of the low-temperature air preheater 23 through the low-temperature air preheater flue gas outlet 23-2.

[0276] The use of a rotating heat exchanger core for air supply (primary air) can provide the following benefits: 1. The service life of the heat exchanger is primarily determined by the heat exchange tube with the shortest service life. When the flue gas contains a high level of dust, a conventional static heat exchanger core often experiences severe erosion and wear of some or parts of the heat exchange tubes, leading to wear and leakage of the heat exchange tubes, thereby reducing the service life of the entire heat exchanger. The present invention, through the rotation of the air supply (primary air) rotary heat exchanger core, can disperse the erosion time and intensity of the heat exchange tubes of the air supply (primary air) rotary heat exchanger core, thereby significantly increasing the service life of the heat exchanger. 2. The service life of the heat exchanger is primarily determined by the heat exchange tube with the shortest service life. When the flue gas temperature is low, the flue gas in the rear section of the flue gas channel of a conventional static heat exchanger core may be below the acid dew point. The heat exchange tubes in the rear section of the flue gas channel will be exposed to an acid corrosive environment for a long time, significantly shortening their service life and thus the service life of the entire heat exchanger. The utility model rotates the air supply (primary air) rotary cage heat exchanger core, and the heat exchange tubes of the air supply (primary air) rotary cage heat exchanger core continuously exchange positions in the high-temperature section, medium-temperature section, and low-temperature section in the flue gas channel of the air supply (primary air) rotary cage heat exchanger core. The time that the heat exchange tubes are in the low-temperature corrosion environment is dispersed, and the time that each heat exchange tube is in the low-temperature corrosion environment is very short. Therefore, the utility model can greatly improve the service life of the heat exchanger; 3. When the flue gas contains a lot of dust, for a conventional static heat exchanger core, some parts of the heat exchange tubes often accumulate dust, solidify, and grow for a long time, resulting in a decrease in the heat exchange efficiency of the heat exchanger, an increase in the flue resistance, and even causing the flue to be blocked, affecting normal operation. The utility model continuously rotates the core of the air supply (primary air) rotary heat exchanger, and each heat exchange tube continuously changes its position in the flue gas channel flow field. Each heat exchange tube also continuously changes its position and angle in the flue gas channel flow field. Dust attached to the heat exchange tube at a certain position or angle can be blown away during the flow of the flue gas after changing the position and angle. Therefore, the utility model can greatly reduce the dust accumulation and solidification of the heat exchange tube and its impact on the flue. 4. Conventional technology When flue gas and air are exchanging heat, generally heat medium water is first used to absorb the heat of the flue gas through the flue gas / heat medium water heat exchanger, and then the heat of the flue gas absorbed by the heat medium water is released to the air supply (primary air) through the air / heat medium water heat exchanger. When the heat exchanger leaks, it will have a great impact on the system and may even cause the equipment to stop operating. The reliability is low, the requirements are high, and the system is complex and the heat exchange end difference is large. The utility model adopts direct heat exchange between flue gas and air, which has high efficiency, small end difference, small irreversible loss, simple system, and will not cause major impact on the system when general flue gas side and air side leakage occurs, and has high reliability.

[0277] A certain gap 23d-6 is maintained between the air supply cage heat exchanger core 23d-5 and the side of the air supply cage heat exchanger shell 23d-0 to ensure that the air supply cage heat exchanger core 23d-5 can rotate normally while reducing the mutual leakage between the smoke inlet 23d-1 of the air supply cage heat exchanger, the smoke outlet 23d-2 of the air supply cage heat exchanger and the smoke channel 23d-5-3 of the air supply cage heat exchanger core and the air supply cage heat exchanger air inlet bellows 23d-3-2, the air supply cage heat exchanger air outlet bellows 23d-4-2 and the air supply cage heat exchanger core air channel 23d-5-2. If the gap is too small, the air supply cage heat exchanger core 23d-5 and the air supply cage heat exchanger shell 23d-0 will be stuck and unable to rotate normally; if the gap is too large, it will cause excessive leakage of the medium on the high-pressure side (generally the supply air) to the low-pressure side (generally the flue gas).

[0278] Similarly, a certain gap 23c-6 is maintained between the primary air rotary cage heat exchanger core 23c-5 and the side of the primary air rotary cage heat exchanger shell 23c-0 to ensure that the primary air rotary cage heat exchanger core 23c-5 can rotate normally while reducing the mutual leakage between the smoke inlet 23c-1 of the primary air rotary cage heat exchanger, the smoke outlet 23c-2 of the primary air rotary cage heat exchanger and the smoke channel 23c-5-3 of the primary air rotary cage heat exchanger and the primary air inlet bellows 23c-3-2 of the primary air rotary cage heat exchanger, the primary air outlet bellows 23c-4-2 and the primary air channel 23c-5-2 of the primary air rotary cage heat exchanger core. If the gap is too small, the primary air rotary heat exchanger core 23c-5 and the primary air rotary heat exchanger shell 23c-0 will be stuck and unable to rotate normally; if the gap is too large, it will cause excessive leakage of the medium on the high-pressure side (generally primary air) to the low-pressure side (generally flue gas).

[0279] Figure 4-1-3-1 This is a structural diagram of another embodiment of the primary air rotary cage heat exchanger in the boiler flue gas waste heat recovery and utilization system of the utility model;

[0280] Figure 4-1-4-1 yes Figure 4-1-3-1 A schematic diagram of the three-dimensional structure of the primary air rotary cage heat exchanger core in the primary air rotary cage heat exchanger shown;

[0281] like Figure 4-1-3-1 、 Figure 4-1-4-1 As shown, Figure 4-1-3 、 Figure 4-1-4The difference is that, between the front end plate 23c-3-1 of the primary air rotary cage heat exchanger core (it can also be the rear end plate 23c-4-1 of the primary air rotary cage heat exchanger core, the basic principle is the same and will not be repeated) and the front end of the primary air rotary cage heat exchanger shell 23c-0, there are isolated primary air rotary cage heat exchanger primary air inlet wind box 23c-3-2 and primary air rotary cage heat exchanger primary air outlet wind box 23c-4-2; the primary air rotary cage heat exchanger shell 23c-0 at the primary air outlet wind box 23c-4-2 is provided with a primary air rotary cage heat exchanger primary air. outlet 23c-4; a primary air rotary cage heat exchanger primary air inlet 23c-3 is provided on the primary air rotary cage heat exchanger shell 23c-0 at the primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger; a primary air rotary cage heat exchanger turning wind box 23c-4-3 is provided between the rear end plate 23c-4-1 of the primary air rotary cage heat exchanger core and the rear end portion of the primary air rotary cage heat exchanger shell 23c-0; the primary air rotary cage heat exchanger core front end plate through hole 23c-3-1-1 connected to the primary air rotary cage heat exchanger primary air inlet wind box 23c-3-2 The inner flow channel of the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 constitutes the primary air rotary cage heat exchanger core air inlet channel 23c-5-2-1; the inner flow channel of the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 connected to the primary air rotary cage heat exchanger core front end plate through hole 23c-3-1-1 in the primary air outlet wind box 23c-4-2 of the primary air rotary cage heat exchanger constitutes the primary air rotary cage heat exchanger core return air channel 23c-5-2-2; the primary air rotary cage heat exchanger core air inlet channel 23c-5-2-1 and the primary air rotary cage heat exchanger core return air channel 23c-5-2-2 constitutes the primary air channel 23c-5-2 of the primary air rotary cage heat exchanger core; the primary air inlet 23c-3 of the primary air rotary cage heat exchanger, the primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger, the core air inlet channel 23c-5-2-1, the primary air rotary cage heat exchanger turning wind box 23c-4-3, the primary air rotary cage heat exchanger core return air channel 23c-5-2-2, the primary air rotary cage heat exchanger primary air outlet wind box 23c-4-2, and the primary air rotary cage heat exchanger primary air outlet 23c-4 are connected in sequence.

[0282] The working process is as follows:

[0283] The flue gas with higher temperature enters the flue gas channel 23c-5-3 of the primary air rotary cage heat exchanger core through the flue gas inlet 23c-1 of the primary air rotary cage heat exchanger; the primary air with lower temperature passes through the primary air inlet 23c-3 of the primary air rotary cage heat exchanger and the primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger, passes through the front end plate 23c-3-1 of the primary air rotary cage heat exchanger core and enters the air inlet channel 23c-5-2- 1, the flue gas outside the heat exchange tube 23c-5-1 of the primary air rotary heat exchanger core transfers heat to the primary air inside the heat exchange tube 23c-5-1 of the primary air rotary heat exchanger core. After the primary air is heated in the core air inlet channel 23c-5-2-1, it passes through the rear end plate 23c-4-1 of the primary air rotary heat exchanger core and flows out, enters the turning wind box 23c-4-3 of the primary air rotary heat exchanger, and then turns to enter the return air of the primary air rotary heat exchanger core. In the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 of the channel 23c-5-2-2, the flue gas outside the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 transfers heat to the primary air in the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 in the primary air rotary cage heat exchanger core return air channel 23c-5-2-2. After the primary air is further heated up in the primary air rotary cage heat exchanger core return air channel 23c-5-2-2, the flue gas outside the primary air rotary cage heat exchanger core heat exchange tube 23c-5-1 transfers heat to the primary air in the primary air rotary cage heat exchanger core return air channel 23c-5-2-2. , flows out through the front end plate 23c-3-1 of the primary air rotary cage heat exchanger core, enters the primary air outlet wind box 23c-4-2 of the primary air rotary cage heat exchanger, and then flows out of the primary air rotary cage heat exchanger 23c through the primary air outlet 23c-4 of the primary air rotary cage heat exchanger; after the flue gas is cooled by heat exchange, it flows out of the flue gas channel 23c-5-3 of the primary air rotary cage heat exchanger core and flows out of the primary air rotary cage heat exchanger 23c through the primary air rotary cage heat exchanger flue gas outlet 23c-2.

[0284] In this embodiment, the primary air adopts a two-pass method. The primary air inlet wind box 23c-3-2 of the primary air rotary cage heat exchanger and its corresponding primary air rotary cage heat exchanger core air inlet channel 23c-5-2-1 can be set in the low temperature area, i.e., the smoke outlet area, of the primary air rotary cage heat exchanger core smoke channel 23c-5-3. The primary air outlet wind box 23c-4-2 of the primary air rotary cage heat exchanger and its corresponding core return air channel 23c-5-2-2 can be set in the high temperature area, i.e., the smoke inlet area, of the primary air rotary cage heat exchanger core smoke channel 23c-5-3. The countercurrent heat exchange between the smoke and the primary air can be utilized to improve the heat exchange efficiency and the primary air temperature of the primary air outlet 23c-4 of the primary air rotary cage heat exchanger.

[0285] Figure 4-2-3-1 This is a structural diagram of another embodiment of the air supply rotary cage heat exchanger in the boiler flue gas waste heat recovery and utilization system of the utility model;

[0286] Figure 4-2-4-1 yes Figure 4-2-3-1 A schematic diagram of the three-dimensional structure of the rotary cage heat exchanger core in the air supply rotary cage heat exchanger shown in FIG;

[0287] like Figure 4-2-3-1 、 Figure 4-2-4-1 As shown, Figure 4-2-3 、 Figure 4-2-4 The difference is that, between the front end plate 23d-3-1 of the air supply cage heat exchanger core (it can also be the rear end plate 23d-4-1 of the air supply cage heat exchanger core, the basic principle is the same and will not be repeated) and the front end of the air supply cage heat exchanger shell 23d-0, there are isolated air supply cage heat exchanger air inlet blower 23d-3-2 and air supply cage heat exchanger air outlet blower 23d-4-2; the air supply cage heat exchanger shell 23d-0 at the blower 23d-4-2 is provided with an air supply cage heat exchanger air outlet blower 23d-3-2. The air supply cage heat exchanger shell 23d-0 at the air supply cage heat exchanger air inlet wind box 23d-3-2 is provided with an air supply cage heat exchanger air inlet 23d-3; a cage heat exchanger turning wind box 23d-4-3 is provided between the rear end plate 23d-4-1 of the air supply cage heat exchanger core and the rear end of the air supply cage heat exchanger shell 23d-0; the air supply cage connected to the air supply cage heat exchanger core front end plate through hole 23d-3-1-1 in the air supply cage heat exchanger air inlet wind box 23d-3-2 The inner flow channel of the heat exchanger core heat exchange tube 23d-5-1 of the heat exchanger constitutes the air inlet channel 23d-5-2-1 of the air supply cage heat exchanger core; the inner flow channel of the heat exchanger core heat exchange tube 23d-5-1 of the air supply cage heat exchanger connected to the front end plate through hole 23d-3-1-1 of the air supply cage heat exchanger core in the air outlet wind box 23d-4-2 of the air supply cage heat exchanger constitutes the air return channel 23d-5-2-2 of the air supply cage heat exchanger core; the air inlet channel 23d-5-2-1 of the air supply cage heat exchanger core and the air return channel 23d -5-2-2 constitutes the air supply channel 23d-5-2 of the air supply cage heat exchanger core; the air supply cage heat exchanger air inlet 23d-3, the air supply cage heat exchanger air inlet bellows 23d-3-2, the air supply cage heat exchanger core air inlet channel 23d-5-2-1, the bellows heat exchanger turning bellows 23d-4-3, the air supply cage heat exchanger core return air channel 23d-5-2-2, the air supply cage heat exchanger air outlet bellows 23d-4-2, and the air supply cage heat exchanger air outlet 23d-4 are connected in sequence.

[0288] The working process is as follows:

[0289] The flue gas with higher temperature enters the flue gas channel 23d-5-3 of the air supply cage heat exchanger core through the flue gas inlet 23d-1 of the air supply cage heat exchanger; the supply air with lower temperature passes through the air supply cage heat exchanger air inlet 23d-3 and the air supply cage heat exchanger air inlet wind box 23d-3-2, passes through the front end plate 23d-3-1 of the air supply cage heat exchanger core and enters the air inlet channel 23d-5-2-1 of the air supply cage heat exchanger core. The flue gas outside the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core transfers heat to the air supply inside the heat exchange tube 23d-5-1 of the air supply cage heat exchanger core. The air is heated in the air inlet channel 23d-5-2-1 of the air supply cage heat exchanger core and then flows out through the rear end plate 23d-4-1 of the air supply cage heat exchanger core, enters the turning bellows 23d-4-3 of the air supply cage heat exchanger, and then turns to enter the air supply cage heat exchanger core. In the air supply rotary heat exchanger core heat exchange tube 23d-5-1 of the air supply rotary heat exchanger core return air channel 23d-5-2-2, the flue gas outside the air supply rotary heat exchanger core heat exchange tube 23d-5-1 transfers heat to the air supply in the air supply rotary heat exchanger core heat exchange tube 23d-5-1 in the air supply rotary heat exchanger core return air channel 23d-5-2-2, and the air supply further exchanges heat in the air supply rotary heat exchanger core return air channel 23d-5-2-2. After being heated, the flue gas flows out through the front end plate 23d-3-1 of the air supply cage heat exchanger core, enters the air supply outlet wind box 23d-4-2 of the air supply cage heat exchanger, and then flows out of the air supply cage heat exchanger 23d through the air supply outlet 23d-4 of the air supply cage heat exchanger; after the flue gas is cooled by heat exchange, it flows out of the flue gas channel 23d-5-3 of the air supply cage heat exchanger core and flows out of the air supply cage heat exchanger 23d through the flue gas outlet 23d-2 of the air supply cage heat exchanger.

[0290] In this embodiment, the air supply adopts a two-pass method. The air supply cage heat exchanger air inlet wind box 23d-3-2 and its corresponding air supply cage heat exchanger core inlet channel 23d-5-2-1 can be set in the low temperature area, i.e., the smoke outlet area, of the air supply cage heat exchanger core smoke channel 23d-5-3, and the air supply cage heat exchanger air outlet wind box 23d-4-2 and its corresponding core return air channel 23d-5-2-2 can be set in the high temperature area, i.e., the smoke inlet area, of the air supply cage heat exchanger core smoke channel 23d-5-3. The countercurrent heat exchange between the smoke and the supply air can be utilized to improve the heat exchange efficiency and the supply air temperature of the air supply cage heat exchanger air outlet 23d-4.

[0291] Optionally, an air supply cage heat exchanger core drive device (not shown in the figure) is also provided;

[0292] Optionally, a primary air rotary cage heat exchanger core driving device (not shown in the figure) is also provided;

[0293] Optionally, the core heat exchange tube 23d-5-1 of the air supply cage heat exchanger adopts an inner fin tube or / and an outer fin tube to improve the heat exchange efficiency; optionally, the core heat exchange tube 23c-5-1 of the primary air cage heat exchanger adopts an inner fin tube or / and an outer fin tube to improve the heat exchange efficiency.

[0294] As another embodiment, the low-temperature air preheater 23 includes a supply air low-temperature air preheater 23b and a primary air low-temperature air preheater 23a; the supply air low-temperature air preheater 23b includes one or more supply air rotary heat pipe heat exchangers 24; or / and the primary air low-temperature air preheater 23a includes one or more primary air rotary heat pipe heat exchangers 24.

[0295] Figure 5 This is a schematic diagram of the three-dimensional structure of an embodiment of the rotary heat pipe heat exchanger of the utility model;

[0296] Figure 5-1 yes Figure 5 The schematic diagram of the planar structure of the rotary heat pipe heat exchanger shown;

[0297] Figure 5-2 yes Figure 5-1 AA cross-sectional structural diagram of the rotary heat pipe heat exchanger shown;

[0298] Figure 5-3 yes Figure 5-1 BB cross-sectional structural diagram of the rotary heat pipe heat exchanger shown;

[0299] Figure 5-4 It is a structural schematic diagram of an embodiment of a heat pipe heat exchanger chamber partition of a rotary heat pipe heat exchanger;

[0300] Figure 5-5 This is a structural diagram of an embodiment of a core partition of a rotary heat pipe heat exchanger;

[0301] Figure 5-6 It is a structural schematic diagram of an embodiment of a heat pipe heat exchanger core of a rotary heat pipe heat exchanger;

[0302] Figure 5-7 This is a structural diagram of an embodiment of connecting the heat pipe heat exchanger core and the heat pipe heat exchanger chamber partition of the rotary heat pipe heat exchanger in the boiler flue gas waste heat recovery and utilization system of the present utility model;

[0303] Figure 5-8 yes Figure 5-7 Schematic diagram of the cross-sectional structure of the superheat tube heat exchanger core axis in the structure shown.

[0304] like Figure 5 、 Figure 5-1 、 Figure 5-2 、 Figure 5-3、 Figure 5-4 、 Figure 5-5 、 Figure 5-6 、 Figure 5-7 、 Figure 5-8As shown, the rotary heat pipe heat exchanger 24 includes a heat pipe heat exchanger shell 24-0, a heat pipe heat exchanger chamber partition 24-7, and a heat pipe heat exchanger core 24-6; the heat pipe heat exchanger shell 24-0 encloses a closed heat pipe heat exchanger chamber 24-9; the heat pipe heat exchanger chamber partition 24-7 is arranged in the heat pipe heat exchanger chamber 24-9 and divides the heat pipe heat exchanger chamber 24-9 into a heat pipe heat exchanger flue gas channel 24-12 and a heat pipe heat exchanger air channel 24-34 isolated from each other; a heat pipe heat exchanger flue gas channel 24-12 is provided on one side of the heat pipe heat exchanger shell 24-0. A heat pipe heat exchanger smoke outlet 24-2 is provided on the other side of the heat pipe heat exchanger shell 24-0 at the heat pipe heat exchanger smoke channel 24-12; a heat pipe heat exchanger air inlet 24-3 is provided on one side of the heat pipe heat exchanger shell 24-0 at the heat pipe heat exchanger air channel 24-34, and a heat pipe heat exchanger air outlet 24-4 is provided on the other side of the heat pipe heat exchanger shell 24-0 at the heat pipe heat exchanger air channel 24-34; a circular or nearly circular heat pipe heat exchanger core through hole 24-7-1 is provided on the heat pipe heat exchanger chamber partition 24-7; the heat pipe heat exchanger core 24- 6 includes a plurality of heat pipes 24-5 and a circular or nearly circular core partition 24-8; the core partition 24-8 is provided with heat pipe through holes 24-8-1 equal to the number of the heat pipes; the heat pipes 24-5 pass through the heat pipe through holes 24-8-1 perpendicularly or nearly perpendicularly to the core partition 24-8, and the heat pipes 24-5 are divided into two sections with the core partition 24-8 as the boundary; the heat pipes 24-5 are sealed to the core partition 24-8 (such as welding or sealing ring connection, the purpose of the sealing connection is to reduce or avoid mutual leakage between the smoke channel and the wind channel, but the sealing degree cannot be understood as absolute); the plurality of ... The tubes 24-5 are parallel or nearly parallel to each other and remain perpendicular or nearly perpendicular to the core partition 24-8; the heat pipe heat exchanger core 24-6 passes through the heat pipe heat exchanger core through hole 24-7-1 in a direction in which the heat pipe 24-5 is perpendicular or nearly perpendicular to the heat pipe heat exchanger chamber partition 24-7, and the core partition 24-8 remains parallel or nearly parallel to the heat pipe heat exchanger chamber partition 24-7 and fits tightly (the core partition 24-8 and the heat pipe heat exchanger chamber partition 24-7 being tightly fitted also includes the core partition 24-8 being tightly fitted to the heat pipe heat exchanger chamber partition 24-7 through other objects.The purpose of close fitting is to reduce the gap between the core partition 24-8 and the heat pipe heat exchanger chamber partition 24-7 to reduce or avoid mutual leakage between the smoke channel and the air supply channel, but close fitting should not be understood as absolutely no gap); one section of the heat pipe 24-5 is located in the heat pipe heat exchanger smoke channel 24-12 as the heat pipe heating section 24-5-1, and the other section of the heat pipe 24-5 is located in the heat pipe heat exchanger air channel 24-34 as the heat pipe heat release section 24-5-2; all the heat pipe heating sections 24-5-1 constitute the heat pipe heat exchanger core heating section 24-6-1; all The heat pipe heat release section 24-5-2 constitutes the heat pipe heat exchanger core heat release section 24-6-2; a straight line or arc passing through the center or near the center of the core partition 24-8 and perpendicular or nearly perpendicular to the core partition 24-8 is used as the heat pipe heat exchanger core axis, and the heat pipe heat exchanger core 24-6 can rotate around the heat pipe heat exchanger core axis; the vertical height of the heat pipe heat release section 24-5-2 is higher than the heat pipe heating section 24-5-1; the vertical height of the heat pipe heat exchanger core heat release section 24-6-2 is higher than the heat pipe heat exchanger core heating section 24-6-1.

[0305] The working process is as follows:

[0306] The flue gas with higher temperature enters the flue gas channel 24-12 of the heat pipe heat exchanger through the flue gas inlet 24-1 of the heat pipe heat exchanger, and flows to the heat pipe heat exchanger core heating section 24-6-1 and contacts the outer surface of the heat pipe heating section 24-5-1. The wind with lower temperature enters the heat pipe heat exchanger wind channel 24-34 through the heat pipe heat exchanger wind inlet 24-3, and flows to the heat pipe heat exchanger core heat release section 24-6-2 and contacts the outer surface of the heat pipe heat release section 24-5-2. Utilizing the heat pipe principle, the flue gas transfers heat to the heat receiving section 24-5-1 of the heat pipe. This section then transfers the heat to the heat releasing section 24-5-2 of the heat releasing section 24-6-2 of the heat pipe heat exchanger core. Ultimately, the heat releasing section 24-5-2 transfers the heat to the air flowing through it. This ensures that the heat from the flue gas flowing through the heat pipe heat exchanger flue gas passage 24-12 is transferred via the heat pipe 24-5 of the heat pipe heat exchanger core 24-6 to the air flowing through the heat pipe heat exchanger air passage 24-34. The flue gas releases heat, cools down, and then flows out of the heat pipe heat exchanger 24 through the heat pipe heat exchanger flue gas outlet 24-2. The air absorbs the heat, heats up, and then flows out of the heat pipe heat exchanger 24 through the heat pipe heat exchanger air outlet 24-4.

[0307] At the same time, the heat pipe core 24-6 can intermittently or continuously rotate about a straight line or arc passing through the center or near the center of the core baffle 24-8 and perpendicular or nearly perpendicular to the core baffle 24-8 as the core axis of the heat pipe heat exchanger. During the rotation of the heat pipe core 24-6, each heat pipe 24-5 changes position and angle accordingly, and the angle and degree of flue gas scouring the heat pipe also change accordingly, clearing away dust deposited on the heat pipe 24-5. The heat pipe 24-5 switches between a low-temperature zone and a high-temperature zone within the flue gas passage 24-12 of the heat pipe heat exchanger.

[0308] Since the heat pipe heat exchanger core is affected by gravity or unevenly affected by thermal expansion, the axis of the heat pipe heat exchanger core may change from a straight line to an arc, and the heat pipe heat exchanger core may rotate around the arc.

[0309] The following advantages can be achieved by rotating the heat pipe heat exchanger core: 1. The service life of the heat exchanger is mainly determined by the heat exchange tube with the shortest service life in the heat exchanger, and the service life of the heat exchange tube is determined by the service life of a certain part of the heat exchange tube. When the flue gas contains a lot of dust, the conventional static heat exchanger core often suffers from severe scouring and wear of some heat exchange tubes or parts of the heat exchange tubes, resulting in wear and leakage of the heat exchange tubes, thereby reducing the service life of the entire heat exchanger. By rotating the heat pipe heat exchanger core, the scouring time and scouring intensity of each heat pipe and each part of the heat pipe in the heat pipe heat exchanger core can be dispersed, thereby significantly improving the service life of the heat exchanger; 2. The service life of the heat exchanger is mainly determined by the heat exchange tube with the shortest service life in the heat exchanger, and the service life of the heat exchange tube is determined by the service life of a certain part of the heat exchanger. When the flue gas temperature is low, for a conventional, stationary heat exchanger core, the flue gas in the rear section of the flue gas channel may be below the acid dew point. The heat exchange tubes in this rear section of the flue gas channel will be exposed to an acidic corrosive environment for extended periods, significantly shortening their service life and, consequently, the service life of the entire heat exchanger. The rotation of the heat pipe heat exchanger core allows the heat pipes within the core to switch positions between the high-temperature, medium-temperature, and low-temperature sections of the flue gas channel, dispersing the time the heat pipes spend in the low-temperature corrosive environment. Each heat pipe spends only a short time in this low-temperature corrosive environment. Because the dust deposited on the heat pipe walls is generally alkaline, the acid precipitated in the flue gas will neutralize the alkaline dust on the heat pipe walls before it. After neutralization, the acid further precipitates from the flue gas before corroding the pipe walls at a specific corrosion rate. Because each heat pipe spends a relatively short time in the low-temperature corrosive zone, the corrosion time after the acid and dust are neutralized is even shorter. Therefore, the service life of the heat exchanger can be greatly improved. 3. When the flue gas contains a lot of dust, a conventional static heat exchanger core often experiences long-term dust accumulation, solidification, and growth in some parts of the heat exchange tubes. This reduces the heat exchange efficiency of the heat exchanger, increases flue resistance, and even causes flue blockage, affecting normal operation. By rotating the heat pipe heat exchanger core, each heat pipe changes its position in the flue gas flow field accordingly. Each heat pipe also changes its position and angle in the flue gas flow field accordingly. Dust attached to a heat exchange tube at a certain position or angle can be blown away during the flue gas flow after the position and angle are changed. Therefore, the dust accumulation and solidification of the heat pipe and its impact on the flue can be greatly reduced; 4. When conventional technology exchanges heat between flue gas and air, heat medium water is generally used to absorb the heat of the flue gas through a flue gas / heat medium water heat exchanger, and then the heat of the flue gas absorbed by the heat medium water is released to the wind through an air / heat medium water heat exchanger. When a heat exchanger leaks, it will have a great impact on the system and may even cause the equipment to stop operating. It has low reliability, high requirements, a complex system, and a large heat exchange end difference.Heat pipe heat exchange ensures that even if a leak occurs, the leak is minimal and will not escalate, resulting in high reliability. Currently, most boiler units are equipped with denitrification systems. During the denitrification process, ammonia is sprayed, and some excess ammonia reacts with sulfides in the flue gas to form ammonium bisulfate. As the flue gas temperature gradually decreases in the heat pipe exchanger, the ammonium bisulfate transforms from a gaseous state into a snot-like mucus, which adheres to dust. When the temperature drops below the solidification point of the ammonium bisulfate, it deposits on the heat exchanger elements, causing corrosion and blockage, seriously impacting operation. By rotating the heat pipe core, the heat pipes within the heat pipe core switch positions between the high-temperature, medium-temperature, and low-temperature sections of the heat pipe flue gas channel. When the flue gas inlet temperature is sufficiently high, the ammonium bisulfate that solidifies in the low-temperature section of the heat pipe can be converted to a liquid state when it moves to the medium-temperature section. This then becomes a gaseous state when it moves to the high-temperature section, effectively preventing corrosion and blockage of the heat pipe due to ammonium bisulfate. This technology can be used to increase the flexibility of thermal power plants, reduce the minimum stable load of units, and improve peak-shaving capabilities.

[0310] like Figure 5-6 As shown, when α > 0, the heat pipe heat release section 24-5-2 is vertically higher than the heat pipe heat receiving section 24-5-1; the heat pipe heat exchanger core heat release section 24-6-2 is vertically higher than the heat pipe heat exchanger core heat receiving section 24-6-1. When α = 90°, the heat pipe 24-5 is placed vertically, with the heat pipe heat release section 24-5-2 located above the heat pipe heat receiving section 24-5-1. This ensures proper operation of the heat pipe.

[0311] When the rotary heat pipe heat exchanger 24 is an air supply rotary heat pipe heat exchanger, the air inlets 24-3 of all the air supply rotary heat pipe heat exchangers together constitute the air supply inlet 23-3-2 of the low-temperature air preheater, and the air outlets 24-4 of all the air supply rotary heat pipe heat exchangers together constitute the air supply outlet 23-4-2 of the low-temperature air preheater; the flue gas inlets 24-1 of all the air supply rotary heat pipe heat exchangers together constitute the flue gas inlet 23b-1 of the air supply low-temperature air preheater; and the flue gas outlets 24-2 of all the air supply rotary heat pipe heat exchangers together constitute the flue gas outlet 23b-2 of the air supply low-temperature air preheater;

[0312] When the rotary heat pipe heat exchanger 24 is a primary air rotary heat pipe heat exchanger, the rotary heat pipe heat exchanger air inlets 24-3 of all primary air rotary heat pipe heat exchangers together constitute the low-temperature air preheater primary air inlet 23-3-1, and the rotary heat pipe heat exchanger air outlets 24-4 of all primary air rotary heat pipe heat exchangers together constitute the low-temperature air preheater primary air outlet 23-4-1; the rotary heat pipe heat exchanger flue gas inlets 24-1 of all primary air rotary heat pipe heat exchangers together constitute the primary air low-temperature air preheater flue gas inlet 23a-1; the rotary heat pipe heat exchanger flue gas outlets 24-2 of all primary air rotary heat pipe heat exchangers together constitute the primary air low-temperature air preheater flue gas outlet 23a-2;

[0313] The supply air low-temperature air preheater flue gas inlet 23b-1 and the primary air low-temperature air preheater flue gas inlet 23a-1 together constitute the low-temperature air preheater flue gas inlet 23-1; the supply air low-temperature air preheater flue gas outlet 23b-2 and the primary air low-temperature air preheater flue gas outlet 23a-2 together constitute the low-temperature air preheater flue gas outlet 23-2;

[0314] Optionally, the heat pipe heat exchanger flue gas channels 24-12 of some or all of the rotary heat pipe heat exchangers 24 are interconnected; or / and, the heat pipe heat exchanger air channels 24-34 of some or all of the air supply rotary heat pipe heat exchangers 24 are interconnected; or / and, the heat pipe heat exchanger air channels 24-34 of some or all of the primary air rotary heat pipe heat exchangers are interconnected;

[0315] Optionally, a heat pipe heat exchanger core driving device (not shown in the figure) is also provided, which is used to drive the heat pipe heat exchanger core to rotate, such as a hydraulic motor, a pneumatic motor, an electric motor, etc.

[0316] Optionally, a core partition support device (not shown in the figure) is further provided on the heat pipe heat exchanger shell 24-0, or on the heat pipe heat exchanger mounting base, or on the heat pipe heat exchanger chamber partition; the heat pipe heat exchanger core 24-6 is supported on the core partition support device through the core partition 24-8; optionally, a sliding device (not shown in the figure), such as a bearing, a bearing, a pulley, etc., is provided between the core partition 24-8 and the core partition support device to reduce the friction resistance between the heat pipe heat exchanger core 24-6 and the core partition support device when the heat pipe heat exchanger rotates; optionally, the core partition 24-8 is provided with a transmission engagement structure (not shown in the figure); the heat pipe heat exchanger core driving device drives the heat pipe heat exchanger core 24-6 to rotate through the transmission engagement device.

[0317] Figure 5-9 It is a structural schematic diagram of another embodiment of a rotary heat pipe heat exchanger.

[0318] like Figure 5-9 As shown, with the axis of the heat pipe heat exchanger core as the axis, the heat pipe heat exchanger flue gas inlet 24-1 and the heat pipe heat exchanger flue gas outlet 24-2 are symmetrically or nearly symmetrically arranged on the heat pipe heat exchanger shell 24-0 on both sides, and the heat pipe heat exchanger air supply inlet 24-3 and the heat pipe heat exchanger air supply outlet 24-4 are symmetrically or nearly symmetrically arranged on the heat pipe heat exchanger shell 24-0 on both sides, and the heat pipe heat exchanger air supply inlet 24-3 is arranged on the heat pipe heat exchanger shell 24-0 on the same side as the heat pipe heat exchanger flue gas outlet 24-2, and the heat pipe heat exchanger air supply outlet 24-3 is arranged on the heat pipe heat exchanger shell 24-0 on the same side as the heat pipe heat exchanger flue gas inlet 24-1; the flue gas flow direction and the air supply flow direction are counter-current in the spatial layout.

[0319] The working process is as follows:

[0320] The flue gas flows through the heat pipe heat exchanger flue gas inlet 24-1, successively through the heat pipe heat exchanger flue gas channel 24-12, and the heat pipe heat exchanger flue gas outlet 24-2. The wind flows through the heat pipe heat exchanger wind inlet 24-3, successively through the heat pipe heat exchanger wind channel 24-34, and the heat pipe heat exchanger wind outlet 24-4. The flue gas flow direction and the wind flow direction are in counter-flow in the spatial layout. The heat pipe's heated section 24-5-1 is located in the high-temperature zone of the heat pipe heat exchanger's flue gas passage 24-12, while the heat pipe's heat release section 24-5-2 is located in the high-temperature zone of the heat pipe heat exchanger's air passage 24-34. The heat pipe's heated section 24-5-1 is located in the low-temperature zone of the heat pipe heat exchanger's flue gas passage 24-12, while the heat pipe's heat release section 24-5-2 is located in the low-temperature zone of the heat pipe heat exchanger's air passage 24-34. The flue gas passing through the heat pipe 24-5 exchanges heat with the air in countercurrent flow. This improves heat exchange efficiency and the air temperature at the heat pipe heat exchanger's air outlet, reducing heat exchanger area and costs.

[0321] In this embodiment, the flue gas inlet and the flue gas outlet of the heat pipe heat exchanger are symmetrically arranged with the axis of the heat pipe heat exchanger core as the center, so that the flue gas has a better flow field distribution in the flue gas channel of the heat pipe heat exchanger; similarly, the air inlet and the air outlet of the heat pipe heat exchanger are symmetrically arranged with the axis of the heat pipe heat exchanger core as the center, so that the air has a better flow field distribution in the air channel of the heat pipe heat exchanger.

[0322] Figure 5-10 It is a schematic diagram of a cross-sectional structure of an embodiment of a heat pipe heat exchanger core rotating shaft passing through the heat pipe heat exchanger core axis.

[0323] Figure 5-11 yes Figure 10 The three-dimensional structural diagram of the heat pipe heat exchanger core shaft is shown.

[0324] Figure 5-1 2 is a schematic diagram of the three-dimensional structure of an embodiment in which the core shaft of the heat pipe heat exchanger is supported on the shell of the heat pipe heat exchanger.

[0325] like Figure 5-10 、 Figure 5-11 、 Figure 5-1 As shown in FIG2 , the heat pipe heat exchanger core shaft 24-11 is provided along the axis of the heat pipe heat exchanger core; a core shaft support device (not shown in the figure) is provided on the heat pipe heat exchanger shell 24-0 or inside or outside the heat pipe heat exchanger shell 24-0 (in this embodiment, it is provided on the heat pipe heat exchanger shell 24-0); both ends of the heat pipe heat exchanger core shaft 24-11 are respectively supported on the core shaft support devices.

[0326] The working process is as follows:

[0327] The heat pipe core shaft 24-11 is provided along the heat pipe core axis. Both ends of the heat pipe core shaft 24-11 are supported on shaft support devices, which support all or part of the weight of the heat pipe core 24-6. The heat pipe core 24-6 can rotate about the heat pipe core axis. Furthermore, to reduce friction between the heat pipe core shaft 24-11 and the shaft support devices, bearings (not shown) are provided between the heat pipe core shaft 24-11 and the shaft support devices.

[0328] Alternatively, the core shaft support device may also be arranged inside or outside the heat pipe heat exchanger shell 24 - 0 , such as on the installation base or the machine base of the heat pipe heat exchanger 24 .

[0329] Optionally, the heat pipe heat exchanger core driving device is in transmission connection with the heat pipe heat exchanger core rotating shaft 24-11 (not shown in the figure), and the heat pipe heat exchanger core driving device drives the heat pipe heat exchanger core rotating shaft 24-11 to rotate, thereby driving the heat pipe heat exchanger core 24-6 to rotate.

[0330] Optionally, the heat pipe heat exchanger core shaft 24 - 11 passes through the core partition 24 - 8 and is fixedly connected to the core partition 24 - 8 (such as welding or bolting).

[0331] Figure 5-1 3 is a schematic structural diagram of another embodiment of a heat pipe heat exchanger chamber partition;

[0332] Figure 5-1 4 is a schematic diagram of the three-dimensional structure of an embodiment of a heat pipe heat exchanger core, a heat pipe heat exchanger chamber partition, and a first heat pipe;

[0333] Figure 5-1 5 yes Figure 5-1 4 is a schematic diagram of a cross-sectional three-dimensional structure of the superheater heat exchanger core axis;

[0334] Figure 5-1 6 is a schematic diagram of the three-dimensional structure of another embodiment of the heat pipe heat exchanger.

[0335] like Figure 5-1 3. Figure 5-1 4. Figure 5-1 5. Figure 5-1 6, the rotary heat pipe heat exchanger is further provided with a plurality of first heat pipes 24-7-5; the heat pipe heat exchanger chamber partition 24-7 is further provided with first heat pipe through holes 24-7-2 equal in number to the first heat pipes; the first heat pipes 24-7-5 all pass through the corresponding first heat pipe through holes 24-7-2, and the first heat pipes 24-7-5 are divided into two sections with the heat pipe heat exchanger chamber partition 24-7 as the boundary; a section of the first heat pipe 24-7-5 located in the heat pipe heat exchanger flue gas channel 24-12 serves as the first heat pipe heating section 24-7-5-1, The other section of the first heat pipe 24-7-5 located in the air channel 24-34 of the heat pipe heat exchanger serves as the first heat pipe heat release section 24-7-5-2; the vertical height of the first heat pipe heat release section 24-7-5-2 is higher than that of the first heat pipe heat receiving section 24-7-5-1; the first heat pipe 24-7-5 is sealedly connected to the first heat pipe through hole 24-7-2 on the heat pipe heat exchanger chamber partition 24-7 (such as welding or sealing ring connection. The purpose of the sealed connection is to reduce or avoid mutual leakage between the flue gas channel and the air channel, but it is not understood that the sealing is absolute).

[0336] The working process is as follows:

[0337] The flue gas with higher temperature enters the flue gas channel 24-12 of the heat pipe heat exchanger through the flue gas inlet 24-1 of the heat pipe heat exchanger and flows to the heat pipe heat exchanger core heating section 24-6-1 and contacts the outer surfaces of the heat pipe heating section 24-5-1 and the first heat pipe heating section 24-7-5-1. The wind with lower temperature enters the heat pipe heat exchanger wind channel 24-34 through the air inlet 24-3 of the heat pipe heat exchanger and flows to the heat pipe heat exchanger core heat release section 24-6-2 and contacts the outer surfaces of the heat pipe heat release section 24-5-2 and the first heat pipe heat release section 24-7-5-2. By utilizing the heat pipe principle, the flue gas transfers heat to the heat pipe heating section 24-5-1 and the first heat pipe heating section 24-7-5-1. The heat pipe heating section 24-5-1 then transfers the heat to the heat pipe heat release section 24-5-2 of the heat pipe heat exchanger core heat release section 24-6-2. The first heat pipe heating section 24-7-5-1 then transfers the heat to the first heat pipe heat release section 24-7-5-2. Finally, the heat pipe heat release section 24-5-2 transfers the heat to the wind flowing through the heat pipe heat release section 24-5-2. The first heat pipe heat release section 24-7-5-2 transfers the heat to the wind flowing through the first heat pipe heat release section 24-7-5-2, thereby realizing that the heat of the flue gas flowing through the flue gas channel 24-12 of the heat pipe heat exchanger is transferred to the wind flowing through the heat pipe heat exchanger air channel 24-34 through the heat pipe 24-5 and the first heat pipe 24-7-5. The flue gas releases heat and cools down before flowing out of the heat pipe heat exchanger 24 through the flue gas outlet 24 - 2 of the heat pipe heat exchanger, and the wind absorbs heat and heats up before flowing out of the heat pipe heat exchanger 24 through the air outlet 24 - 4 of the heat pipe heat exchanger.

[0338] In this embodiment, heat pipe 24-5 is rotatable, while first heat pipe 24-7-5 is stationary. The provision of the first heat pipe fully utilizes the space within heat pipe exchanger chamber 24-9, arranging more heat pipes and improving the heat exchange capacity of heat pipe exchanger 24. This also facilitates balanced flue gas flow in heat pipe exchanger flue gas channel 24-12 and balanced air flow in heat pipe exchanger air channel 24-34, reducing biased flow and severe localized scouring, and balancing the heat exchange efficiency of each heat pipe and the first heat pipe.

[0339] Figure 6-1 It is a structural schematic diagram of an implementation method of a heat pipe heat exchanger chamber partition.

[0340] Figure 6-2 It is a structural schematic diagram of an embodiment of a core partition.

[0341] Figure 6-3 It is a three-dimensional structural diagram of an implementation method of connecting the chamber partition and the core partition of a heat pipe heat exchanger.

[0342] Figure 6-4 yes Figure 6-3 A schematic diagram of the cross-sectional structure of the heat pipe heat exchanger core through the axis of the embodiment shown.

[0343] like Figure 6-1 、 Figure 6-2 、 Figure 6-3 、 Figure 6-4 As shown, the outer diameter R1 of the core partition 24-8 is larger than the inner diameter R2 of the heat pipe heat exchanger core through hole 24-7-1 of the heat pipe heat exchanger chamber partition 24-7; the core partition 24-8 is located on the side of the heat pipe heat exchanger air channel 24-34 of the heat pipe heat exchanger chamber partition 24-7; the core partition 24-8 can automatically fit with the heat pipe heat exchanger chamber partition 24-7 by its gravity.

[0344] The working process is as follows:

[0345] The outer diameter R1 of the core partition 24-8 is greater than the inner diameter R2 of the heat pipe heat exchanger core through hole 24-7-1 of the heat pipe heat exchanger chamber partition 24-7. The core partition 24-8 is located on the heat pipe heat exchanger air channel 24-34 side of the heat pipe heat exchanger chamber partition 24-7. Since the vertical height of the heat pipe heat exchanger core heat release section 24-6-2 is higher than the heat pipe heat exchanger core heat receiving section 24-6-1, under the action of the weight of the heat pipe heat exchanger core, there will be a component force that causes the heat pipe heat exchanger core 24-6 to slide toward the heat pipe heat exchanger flue gas channel 24-12 until the core partition 24-8 is pressed against the heat pipe heat exchanger chamber partition 24-7. Figure 6-4 As shown in the figure, the gap δ between the core partition 24-8 and the heat pipe heat exchanger chamber partition 24-7 is relatively small, so that the core partition 24-8 automatically fits with the heat pipe heat exchanger chamber partition 24-7 due to its gravity, and the heat pipe heat exchanger flue gas channel 24-12 and the heat pipe heat exchanger air channel 24-34 are well isolated to prevent the flue gas and air from leaking into each other.

[0346] Figure 6-5 It is a schematic cross-sectional structure diagram of another embodiment of the connection method between the chamber partition and the core partition of the heat pipe heat exchanger, passing through the axis of the heat pipe heat exchanger core.

[0347] like Figure 6-5 As shown, in Figure 6-4 On the basis, a sealing device 24-10 is provided between the core partition plate 24-8 and the heat pipe heat exchanger chamber partition plate 24-7 to reduce or avoid leakage between the heat pipe heat exchanger flue gas channel 24-12 and the heat pipe heat exchanger air channel 24-34.

[0348] Figure 7-1 It is a structural schematic diagram of another embodiment of a heat pipe heat exchanger core.

[0349] Figure 7-2It is a three-dimensional structural schematic diagram of another embodiment of connecting a heat pipe heat exchanger core and a heat pipe heat exchanger chamber partition.

[0350] Figure 7-3 yes Figure 7-2 A schematic diagram of the cross-sectional three-dimensional structure of the superheat tube heat exchanger core axis of the illustrated embodiment.

[0351] Figure 7-4 It is a three-dimensional structural schematic diagram of another embodiment in which the core shaft of the heat pipe heat exchanger is supported on the shell of the heat pipe heat exchanger.

[0352] like Figure 7-1 、 Figure 7-2 、 Figure 7-3 、 Figure 7-3 、 Figure 7-4 As shown, the heat pipe heat exchanger core 24-6 is further provided with a core heating section end plate 24-11-1 and a core heat release section end plate 24-11-2. All or part of the heat pipe heating section 24-5-1 is connected to the core heating section end plate 24-11-1 via an expansion joint 24-16 (e.g., welded, bolted, etc.); all or part of the heat pipe heat release section 24-5-2 is connected to the core heat release section end plate 24-11-2 via an expansion joint 24-16 (e.g., welded, bolted, etc.). The heat pipe heat exchanger core shaft 24-11 is disposed on the core heating section end plate 24-11-1 and the core heat release section end plate 24-11-2. Both ends of the heat pipe heat exchanger core shaft 24-11 are supported on the core shaft support device. The rigidity of the heat pipe heat exchanger core 24 - 6 can be increased, and the deformation of the heat pipe and the deformation during the rotation process can be reduced.

[0353] Heat pipes that are heated differently will have different amounts of expansion, especially when one or part of the heat pipes fail (such as vacuum damage, leakage, etc.), there will be a large gap between the amount of expansion and that of the heat pipes that are operating normally. If both ends of the heat pipe are fixed, huge stress or deformation will be generated due to expansion and contraction, and even damage to the equipment will occur. In this embodiment, all or part of the heat pipe heating section 24-5-1 is connected to the core heating section end plate 24-11-1 through an expansion joint 24-16 (such as welding, bolting, etc.); all or part of the heat pipe heat release section 24-5-2 is connected to the core heat release section end plate 24-11-2 through an expansion joint 24-16 (such as welding, bolting, etc.), which can absorb the expansion and contraction changes and the unbalanced expansion and contraction between the heat pipes, and avoid the generation of expansion and contraction stresses that cause damage and deformation.

[0354] Figure 8 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0355] like Figure 8 As shown, in Figure 3-1On the basis, a spray tower 12 is connected in series between the desulfurization tower 6 and the chimney 7; a first air supply heater 100 is provided on the air supply channel directly or indirectly connected to the blower inlet 8-1 or the blower outlet 8-2 (in this embodiment, the first air supply heater 100 is provided on the air supply channel directly or indirectly connected to the blower inlet 8-1);

[0356] The spray tower 12 is provided with a spray tower flue gas inlet 12-1, a spray tower flue gas outlet 12-2, a spray tower heat medium water inlet 12-3, and a spray tower heat medium water outlet 12-4. A spray tower water receiving device 12-5 is provided at the bottom of the spray tower. A spray tower water distribution device 12-6 for heat medium water is provided between the spray tower flue gas inlet 12-1 and the spray tower flue gas outlet 12-2. The spray tower water distribution device 12-6 is connected to the spray tower heat medium water inlet 12-3, and the spray tower water receiving device 12-5 is connected to the spray tower heat medium water outlet 12-4.

[0357] The first air supply heater 100 is provided with a first air supply heater air supply inlet 100-1, a first air supply heater air supply outlet 100-2, a first air supply heater heat medium water inlet 100-3, and a first air supply heater heat medium water outlet 100-4;

[0358] The desulfurization tower flue gas outlet 6-4 is directly or indirectly connected to the spray tower flue gas inlet 12-1; the spray tower flue gas outlet 12-2 is directly or indirectly connected to the chimney 7; the spray tower heat medium water outlet 12-4 is directly or indirectly connected to the first air supply heater heat medium water inlet 100-3; the first air supply heater heat medium water outlet 100-4 is directly or indirectly connected to the spray tower heat medium water inlet 12-3; the first air supply heater air outlet 100-2 is directly or indirectly connected to the blower inlet 8-1; the first air supply heater air inlet 100-1 is directly or indirectly connected to the atmosphere.

[0359] The working process is:

[0360] After desulfurization, saturated or nearly saturated flue gas enters spray tower 12 through spray tower flue gas inlet 12-1. Thermal water from the first air supply heater 100 is delivered through spray tower thermal water inlet 12-3 to spray tower water distributor 12-6. Spray tower water distributor 12-6 distributes the thermal water into the flue gas. The flue gas and thermal water mix and exchange heat in spray tower 12. The saturated flue gas is further cooled, dehumidified, and scrubbed before being discharged into the atmosphere through spray tower flue gas outlet 12-2 and chimney 7.

[0361] The heat transfer water from the spray tower heat transfer water outlet 12-4 is directly or indirectly delivered to the first air heater heat transfer water inlet 100-3, entering the heat transfer water channel of the first air heater 100. Driven by the blower 8, the supply air (air) passes through the first air heater supply air inlet 100-1 and enters the supply channel of the first air heater 100. The heat transfer water in the first air heater 100 supply air channel heats the supply air in the first air heater 100 supply air channel, reducing its temperature. The air then flows out through the first air heater heat transfer water outlet 100-4 and returns to the spray tower heat transfer water inlet 12-3 for recycling. The heated supply air flows out through the first air heater supply air outlet 100-2, is then delivered to the low-temperature air preheater and air preheater 2, and is further heated before being delivered to the furnace of boiler 1. When the air heater 9 is set, the air with increased temperature flows out through the first air heater outlet 100-2, and then is sent to the air heater 9 and the air preheater 2 in sequence, and is further heated before being sent to the furnace of the boiler 1. The other working processes are the same Figure 2-2 , no more details.

[0362] When ignoring the portion of heat ultimately distributed into the furnace of boiler 1 by the heat transferred to the air by the first air heater 100 and other minor factors, the heat transferred to the air by the first air heater 100 can be isothermally converted into an increase in the bypass flue gas flow rate of bypass economizer 15, thereby increasing the heat of the working fluid water at bypass economizer working fluid water outlet 15-4. This, in turn, converts the low-grade thermal energy of the desulfurized saturated flue gas into isothermally high-grade working fluid water heat energy through the spray tower 12, the first air heater 100 (or the low-temperature air preheater, when a low-temperature air preheater is provided in place of the flue heat exchanger and air heater), the air preheater 2, and the bypass economizer 15, thereby improving the utilization value and efficiency of the thermal energy. When taking into account the portion of heat ultimately distributed into the furnace of boiler 1 by the heat transferred to the air by the first air heater 100, the energy-saving effect is even greater.

[0363] After large-flow and full-coverage washing with heat medium water, pollutants in the flue gas such as residual desulfurization slurry, sulfur dioxide, sulfur trioxide, fine dust (such as PM2.5), heavy metals, etc. can be further removed; the temperature and humidity of the flue gas are reduced, and the condensable particulate matter in the flue gas is reduced; the fine droplets formed by the condensation of water vapor in the flue gas serve as condensation nuclei, which can condense other fine particles through coagulation to form large particles, thereby improving the removal efficiency; the humidity of the flue gas is reduced, which can improve the local atmospheric environment, reduce the possibility of aerosol and haze formation, and further weaken the chimney plume phenomenon, thereby achieving the purpose of chimney whitening.

[0364] In addition, part of the water in the saturated flue gas is condensed and precipitated, which can play the role of water recycling. This part of water is condensed water without chloride ions. After being recycled into the system, it can reduce process water replenishment. When the process water replenishment contains chloride ions, it can also reduce the intake of chloride ions, reduce the treatment cost and discharge of wastewater, thereby achieving further energy saving, water saving and reduction of flue gas pollutants and water pollution emissions.

[0365] Since the flue gas at the outlet of desulfurization tower 6 has been desulfurized and dust-removed to meet higher emission standards, the condensate from the flue gas in spray tower 12 is of high quality and can be sent outside the system for use without affecting the water balance of desulfurization tower 6. Since the saturated flue gas at the outlet of desulfurization tower 6 is at a low temperature, hybrid heat exchange can achieve near-zero end-difference heat exchange, thereby increasing the recovery of flue gas waste heat.

[0366] The first air supply heater 100 has adaptive and self-adjusting capabilities for chimney plume control. When ambient temperature is low, the plume phenomenon worsens, and the diffusion of flue gas pollutants at the chimney outlet deteriorates. Simultaneously, the air temperature at the first air supply heater's air inlet 100-1 is also low, increasing the first air supply heater's 100 cooling capacity for the heat transfer water. This lowers the temperature at the first air supply heater's heat transfer water outlet 100-4, which in turn increases the condensation and cooling of the flue gas by the heat transfer water in the spray tower 12. This enhances the chimney plume reduction effect and reduces pollutants in the flue gas. The reverse is also true. When atmospheric humidity increases, the diffusion of flue gas pollutants at the chimney outlet deteriorates, exacerbating the plume phenomenon. Simultaneously, as air humidity and specific heat capacity increase, the first air supply heater's 100 cooling capacity for the heat transfer water decreases, reducing the temperature at the first air supply heater's heat transfer water outlet 100-4, increasing the condensation and cooling of the flue gas, enhancing the chimney plume reduction effect and reducing pollutants in the flue gas. The reverse is also true.

[0367] The spray tower heat medium water outlet 12-4 may be one or more; the spray tower heat medium water inlet 12-3 may be one or more.

[0368] When the first air supply heater 100 is arranged on the air supply channel directly or indirectly connected to the blower outlet 8-2, the first air supply heater air inlet 100-1 is directly or indirectly connected to the blower outlet 8-2; the first air supply heater air outlet 100-2 is directly or indirectly connected to the air preheater air inlet 2-3-2; when an air supply heater 9 is provided, the first air supply heater air outlet 100-2 is directly or indirectly connected to the air supply heater air inlet 9-1 (not shown in the figure). When a low-temperature air preheater is provided, the first air supply heater air outlet 100-2 is directly or indirectly connected to the low-temperature air preheater air inlet.

[0369] The working process is as follows: the air from the blower 8 enters the first air heater 100, is heated by the heat medium water from the spray tower 12, and is further heated by the air heater (if any) or the low-temperature air preheater before being sent to the air preheater air inlet 2-3-2. The other working processes are the same Figure 8 , no more details.

[0370] Optionally, the spray tower heat medium water inlet 12-3 is directly or indirectly connected to a raw water source device 35, and the spray tower heat medium water outlet is directly or indirectly connected to a raw water user 36. Raw water from the raw water source device 35 enters the spray tower water distribution device 12-6 through the spray tower heat medium water inlet 12-3. The raw water is heated by the flue gas from the spray tower. The heated raw water is then delivered to the raw water user 36 through the spray tower heat medium water outlet 12-4, thereby fully utilizing the waste heat of the flue gas and reducing energy consumption.

[0371] Figure 8-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0372] like Figure 8-1 As shown, in Figure 8 On the basis of the above, a first primary air heater 100a is provided on the primary air channel directly or indirectly connected to the primary air fan inlet 5-1; the first primary air heater 100a is provided with a first primary air heater primary air inlet 100a-1, a first primary air heater primary air outlet 100a-2, a first primary air heater heat medium water inlet 100a-3, and a first primary air heater heat medium water outlet 100a-4; the spray tower heat medium water inlet 12-3 is also directly or indirectly connected to the first primary air heater heat medium water outlet 100a-4; the spray tower heat medium water outlet 12-4 is also directly or indirectly connected to the first primary air heater heat medium water inlet 100a-3; the first primary air heater primary air outlet 100a-2 is directly or indirectly connected to the primary air fan inlet 5-1; the first primary air heater primary air inlet 100a-1 is directly or indirectly connected to the atmosphere.

[0373] The working process is as follows:

[0374] The heat transfer water from the spray tower heat transfer water outlet 12-4 is directly or indirectly delivered to the first primary air heater heat transfer water inlet 100a-3, entering the heat transfer water channel of the first primary air heater 100a. Driven by the primary fan 5, the primary air (air) passes through the first primary air heater primary air inlet 100a-1 and enters the primary air channel of the first primary air heater 100a. The heat transfer water in the heat transfer water channel of the first primary air heater 100a heats the primary air in the primary air channel of the first primary air heater 100a, reducing its temperature. The air then flows out through the first primary air heater heat transfer water outlet 100a-4 and returns to the spray tower heat transfer water inlet 12-3 for recycling. The heated primary air flows out through the first primary air heater primary air outlet 100a-2 and is then delivered to the primary air heater 10 (if any) or low-temperature air preheater for further heating. A portion of the air is then delivered to the coal mill primary air inlet 3-2, while a portion is heated in the air preheater 2 and then delivered to the coal mill primary air inlet 3-2.

[0375] The spray tower heat medium water and the first primary air heater 100a can further recover the waste heat of the saturated flue gas after desulfurization, and on the other hand, can further transfer the primary air heating capacity of the air preheater 2 to the supply air heating capacity.

[0376] Optionally, a spray tower demister is provided on the flue gas passage between the spray tower water distribution device 12-6 and the chimney 7;

[0377] Optionally, a first heat medium water circulation pump (not shown in the figure) is provided on the heat medium water pipeline directly or indirectly connected to the heat medium water outlet 12-4 of the spray tower or the heat medium water inlet 12-3 of the spray tower. The purpose is to provide flow power for the heat medium water through the heat medium water circulation pump;

[0378] Optionally, a packing layer (not shown in the figure) is provided between the spray tower water receiving device and the spray tower water distribution device.

[0379] Figure 9 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0380] like Figure 9 As shown, in Figure 3-1 On the basis, an absorption heat pump 90 is also provided; and a spray tower 12 is connected in series between the desulfurization tower 6 and the chimney 7. The structure of the spray tower 12 is the same as Figure 8 As shown in;

[0381] The absorption heat pump 90 includes an evaporator 91, an absorber 92, a generator (also called a regenerator) 93, and a condenser 94; the evaporator 91 is provided with an evaporator low-temperature heat source inlet 91-1, an evaporator low-temperature heat source outlet 91-2, an evaporator refrigerant water inlet 91-3, and an evaporator refrigerant water vapor outlet 91-4; the absorber 92 is provided with an absorber cold water inlet 92-1, an absorber cold water outlet 92-2, an absorber refrigerant water vapor inlet 92-3, an absorber concentrated absorbent inlet inlet 92-4, and absorber dilute absorbent outlet 92-5; the generator 93 is provided with a generator high-temperature heat source inlet 93-1, a generator high-temperature heat source outlet 93-2, a generator dilute absorbent inlet 93-3, a generator concentrated absorbent outlet 93-4, and a generator refrigerant water vapor outlet 93-5; the condenser 94 is provided with a condenser cooling water inlet 94-1, a condenser cooling water outlet 94-2, a condenser refrigerant water vapor inlet 94-3, and a condenser refrigerant water outlet 94-4.

[0382] The evaporator refrigerant water inlet 91-3 is directly or indirectly connected to the condenser refrigerant water outlet 94-4; the evaporator refrigerant water vapor outlet 91-4 is directly or indirectly connected to the absorber refrigerant water vapor inlet 92-3; the absorber concentrated absorbent inlet 92-4 is directly or indirectly connected to the generator concentrated absorbent outlet 93-4; the absorber lean absorbent outlet 92-5 is directly or indirectly connected to the generator lean absorbent inlet 93-3; the generator refrigerant water vapor outlet 93-5 is directly or indirectly connected to the condenser refrigerant water vapor inlet 94-3. The absorber cold water outlet 92-2 is directly or indirectly connected to the condenser cooling water inlet 94-1; the absorption heat pump 90 constitutes a first type of absorption heat pump, that is, a heat-increasing absorption heat pump;

[0383] The spray tower heat medium water outlet 12-4 is directly or indirectly connected to the evaporator low-temperature heat source inlet 91-1; the evaporator low-temperature heat source outlet 91-2 is directly or indirectly connected to the spray tower heat medium water inlet 12-3;

[0384] The bypass economizer working medium water outlet 15-4 is directly or indirectly connected to the generator high temperature heat source inlet 93-1; the generator high temperature heat source outlet 93-2 is directly or indirectly connected to the bypass economizer working medium water inlet 15-3;

[0385] The working process is:

[0386] The heat transfer water from the spray tower heat transfer water outlet 12-4 enters the heat exchange tubes within the evaporator 91 through the evaporator's low-temperature heat source inlet 91-1. The interior of the evaporator 91 is at a low pressure (e.g., a vacuum). Due to the low boiling point of water at low pressure, the refrigerant water delivered by the condenser 94 absorbs the heat from the heat transfer water in the heat transfer tubes and evaporates, cooling the heat transfer water. Simultaneously, the refrigerant water vapor generated by the evaporation enters the absorber 92. The cooled heat transfer water exits the absorption heat pump 90 through the evaporator's low-temperature heat source outlet 91-2, returns to the spray tower heat transfer water inlet 12-3, and enters the spray tower water distribution device 12-6 for recycling.

[0387] Cold water enters the heat transfer tubes of absorber 92 through absorber cold water inlet 92-1. Inside absorber 92, the concentrated lithium bromide solution (or other absorbent solution) draws on the strong water absorption properties of the concentrated solution from generator 93 to absorb water vapor from evaporator 91, releasing heat and raising the solution temperature to a level higher than the heat transfer medium from spray tower 12. As the solution contacts the heat transfer tubes of absorber 92, it heats the cold water inlet, transferring the low-grade heat from the spray tower heat transfer medium to the cold water. This raises the cold water temperature to a level higher than the heat transfer medium at the evaporator low-temperature heat source inlet 91-1. The water then flows out through absorber cold water outlet 92-2 and into the condenser cooling water inlet 94-1. Simultaneously, the concentrated lithium bromide solution becomes a dilute solution before being transported to generator 93.

[0388] The higher temperature working water from the bypass economizer working water outlet 15-4 is used as a high temperature driving heat source and enters the generator 93 through the generator high temperature heat source inlet 93-1. The dilute lithium bromide solution from the absorber 92 in the generator 93 is heated and concentrated into a concentrated solution by the working water and then enters the absorber 92. The working water heats and concentrates the dilute lithium bromide solution while generating a higher temperature refrigerant water vapor, which enters the condenser 94. After the working water is cooled by heat exchange, it flows out of the absorption heat pump 90 through the generator high temperature heat source outlet 93-2 and returns to the bypass economizer working water inlet 15-3 for recycling.

[0389] The cold water from the absorber cold water outlet 92-2, which has been heated and heated by the absorber 92, enters the condenser 94 through the condenser cooling water inlet 94-1 as cooling water. In the condenser 94, the high-temperature refrigerant water vapor from the generator 93 exchanges heat with the cooling water, releases latent heat of condensation, and condenses into refrigerant water. The cooling water absorbs heat and heats up, then flows out of the condenser 94 through the condenser cooling water outlet 94-2 and is sent to other process links or external heat users of the system for use; the refrigerant water after the refrigerant water vapor is condensed enters the evaporator 91 for evaporation, and the cycle continues.

[0390] Driven by a high-temperature heat source, cold water from other process steps or external heat users is heated sequentially through absorber 92 and condenser 94. The heat content of the cold water at condenser cooling water outlet 94-2 is equal to the sum of the heat input from the spray tower heat medium water outlet 12-4 via the evaporator's low-temperature heat source inlet 91-1 and the heat input from the generator's high-temperature heat source inlet 93-1. This converts the low-temperature thermal energy of the heat medium water from the spray tower heat medium water outlet 12-4 into higher-temperature heat energy. This constitutes a first-class absorption heat pump, namely a heat-increasing absorption heat pump. The cold water at condenser cooling water outlet 94-2 can be used in other process steps or delivered to external users, such as for external heating or heat supply.

[0391] According to the principles of absorption heat pumps, within a certain range, increasing the temperature of the high-temperature driving heat source can improve the efficiency of the absorption heat pump. Therefore, the low-temperature heat energy of the flue gas at the air preheater flue gas outlet 2-2 can be converted into the high-temperature heat energy of the working water at the bypass economizer working water outlet 15-4. The high-temperature working water at the bypass economizer working water outlet 15-4 can then be used as the high-temperature driving heat source for the absorption heat pump 90, thereby improving the operating efficiency of the absorption heat pump 90. Specifically, while the amount of waste heat from the flue gas at the air preheater flue gas outlet 2-2 remains the same, more waste heat from the low-grade flue gas at the outlet of the desulfurization tower 6 can be recovered.

[0392] Under normal circumstances, the flue gas temperature at the air preheater flue gas outlet 2-2 is about 120°C, the flue gas temperature at the air preheater flue gas inlet 2-1 is about 300°C, and the working water temperature from the bypass economizer working water outlet 15-4 (high-temperature driving heat source) can reach about 290°C (can be adjusted according to the requirements of the absorption heat pump 90); the saturated flue gas temperature at the desulfurization tower flue gas outlet 6-4 is about 50°C, and the heat medium water temperature from the spray tower 12 is about 40°C (low-temperature heat source); the cold water temperature at the condenser cooling water outlet 94-2 of the absorption heat pump 90 can reach about 80°C (output heat energy). That is, the heat exchange between the heat medium water in the spray tower and the flue gas is used to recover the low-grade flue gas waste heat that is difficult to recover after desulfurization. The low-temperature air preheater 23 and the bypass economizer 15 are used to convert the low-temperature flue gas waste heat at the flue gas outlet 2-2 of the air preheater into high-temperature thermal energy of about 290°C (adjustable as needed) and serve as a high-temperature driving heat source for the absorption heat pump 90. The absorption heat pump and the high-temperature driving heat source are then used to convert the low-temperature heat of the heat medium water that is difficult to utilize from the spray tower into usable medium-temperature heat. The heat of the cold water at the cooling water outlet 94-2 of the condenser is equal to the sum of the heat of the working fluid water from the working fluid water outlet 15-4 of the bypass economizer and the heat of the heat medium water from the heat medium water outlet 12-4 of the spray tower, thereby increasing the available heat. Compared with conventional technologies that use high-value high-temperature driven heat sources, all heat in this embodiment comes from flue gas waste heat, and flue gas waste heat is recovered by using flue gas waste heat, "treating waste with waste, taking waste with waste, and turning waste into treasure", thereby greatly improving the flue gas waste heat recovery amount, energy quality and utilization efficiency, and greatly improving economic efficiency.

[0393] After the heat medium water is cooled by the evaporator, it is sent to the spray tower 12 for mixed heat exchange with the flue gas, which can better cool and dehumidify the flue gas, and achieve better water saving, pollution reduction and de-whitening effects.

[0394] Optionally, a high-temperature heat source water pump (not shown) is provided on the high-temperature heat source channel directly or indirectly connected to the generator high-temperature heat source inlet 93-1 or the generator high-temperature heat source outlet 93-2. The purpose is to provide flow power for the high-temperature driving heat source through the high-temperature heat source water pump.

[0395] Optionally, the generator high-temperature heat source outlet 93-2 is directly or indirectly connected to the bypass economizer working medium water inlet 15-3 through a cooler (not shown in the figure); optionally, the cooler is a generator of another absorption heat pump or other air supply heater;

[0396] Optionally, a cold water pump (not shown in the figure) is connected in series to the cold water channel directly or indirectly connected to the condenser cooling water outlet 93-2 or the absorber cold water inlet 92-1;

[0397] Optionally, a cold water reheater (not shown in the figure) is connected in series to the cold water channel to which the condenser cooling water outlet 94 - 2 is directly or indirectly connected.

[0398] Figure 9-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0399] like Figure 9-1 As shown, Figure 9 The difference is that the generator high temperature heat source inlet 93-1 is directly or indirectly connected to the flue heat exchanger working medium water outlet 22-4-2, and the generator high temperature heat source outlet 93-2 is directly or indirectly connected to the flue heat exchanger working medium water inlet 22-3-2.

[0400] The working process is:

[0401] Working water from the flue heat exchanger's working water outlet 22-4-2 serves as the high-temperature driving heat source for the absorption heat pump 90. It enters the generator 93 through the generator's high-temperature heat source inlet 93-1 for heat exchange and cooling, then flows out through the generator's high-temperature heat source outlet 93-2 and returns to the flue heat exchanger's working water inlet 22-3-2 for recycling. This reduces the efficiency of the absorption heat pump 90, but the working water from the bypass economizer's working water outlet 15-4 can be used more efficiently in other process steps or for heat users.

[0402] Figure 9-2 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0403] like Figure 9-2 As shown, Figure 9 The difference is that the high-temperature heat source channel of the generator 93 is connected in series on the working fluid water channel of the flue heat exchanger working fluid water outlet 22-4-2 and the working fluid water inlet 9-3 of the air supply heater, the flue heat exchanger working fluid water outlet 22-4-2 is directly or indirectly connected to the generator high-temperature heat source inlet 93-1, the generator high-temperature heat source outlet 93-2 is directly or indirectly connected to the working fluid water inlet 9-3 of the air supply heater, and the air supply heater working fluid water outlet 9-4 is directly or indirectly connected to the flue heat exchanger working fluid water inlet 22-3-2.

[0404] The working process is as follows:

[0405] The working water from the flue heat exchanger's working water outlet 22-4-2 first enters the generator 93 as a high-temperature driving heat source for heat exchange and cooling. It is then sent to the air heater 9 as a heating heat source to heat the supply air. After heat exchange and cooling with the supply air, it returns to the flue heat exchanger 22 for continued recycling. This embodiment more fully utilizes the working water heat from the flue heat exchanger 22 while also reducing the working water temperature at the flue heat exchanger's working water inlet 22-3-2, thereby improving the heat exchange efficiency of the flue heat exchanger 22.

[0406] Figure 10 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0407] like Figure 10 As shown, in Figure 9 Based on Figure 8 A first air supply heater 100 is also provided, and the first air supply heater heat medium water inlet 100-3 is also directly or indirectly connected to the condenser cooling water outlet 94-2; the first air supply heater heat medium water outlet 100-4 is also directly or indirectly connected to the absorber cold water inlet 92-1.

[0408] The working process is as follows:

[0409] The cold water from the condenser cooling water outlet 94-2 is sent to the first air heater heat medium water inlet 100-3 and enters the first air heater 100 heat medium water channel. After heating the air flowing through the first air heater 100 air channel, it is returned to the absorber cold water inlet 92-1 through the first air heater heat medium water outlet 100-4. For other working processes, see Figure 8 and Figure 9 The description is not repeated here.

[0410] Part of the working water at the bypass economizer working water outlet 15-4 is used as a high-temperature driving heat source, and its heat is set to Qg. The first type absorption heat pump 90 absorbs the heat of the low-temperature heat source of the low-temperature heat medium water from the spray tower 12, which is set to Qd, and converts it into medium-temperature heat at the condenser cooling water outlet 94-2, which is set to QZ. According to the working principle of the first type absorption heat pump, QZ=Qg+Qd. This part of heat is transferred to the supply air through the first supply air heater 100, and then enters the air preheater 2. While keeping the supply air temperature and primary air temperature at the outlet of the air preheater 2 and the flue gas temperature entering the desulfurization tower 6 unchanged and ignoring minor factors, the bypass flue gas flow of the bypass economizer 15 can be increased. The heat of this part of the flue gas is QZ=Qg+Qd, that is, the high-temperature driving heat source from the bypass economizer 15 and the low-grade thermal energy of the saturated flue gas from the spray tower 12 that is difficult to use after desulfurization are converted into high-temperature thermal energy of the flue gas through the absorption heat pump 90, the spray tower 12, the first supply air heater 100, the air preheater 2, the bypass economizer 15, etc.

[0411] The high-temperature driving heat source of the absorption heat pump 90 can also be the working water at the flue heat exchanger working water outlet 22-4-2, but because its temperature is lower than the working water temperature at the bypass economizer working water outlet 15-4, the efficiency of the absorption heat pump 90 will be lower;

[0412] like Figure 10 Structural diagram of the implementation method, the heating heat source of the first air supply heater 100 can be two ways: one is the thermal medium water from the spray tower 12; the other is from the absorption heat pump 90. It can be selected according to the system needs and the change of ambient temperature. During the heating period, the absorption heat pump is mainly used for external heating, and the ambient temperature is low, the air temperature entering the first air supply heater 100 is low, the thermal medium water at the thermal medium water outlet 12-4 of the spray tower and the air entering the first air supply heater 100 have a large heat exchange temperature difference, and the heat exchange amount and heat exchange efficiency are high. During this period, the thermal medium water from the spray tower 12 can be used to heat the air through the first air supply heater 100; during the non-heating period, the absorption heat pump has no need for external heating, and the ambient temperature is high, the air temperature entering the first air supply heater 100 is high, and the thermal medium water from the spray tower The heat exchange temperature difference between the heat medium water at the outlet 12-4 and the air entering the first air supply heater 100 is small, and the heat exchange amount and heat exchange efficiency are small. The cold water temperature at the condenser cooling water outlet 94-2 of the absorption heat pump 90 is higher than the temperature of the heat medium water outlet 12-4 of the spray tower. The heat exchange temperature difference between the cold water at the condenser cooling water outlet 94-2 and the air entering the first air supply heater 100 is large, and the heat exchange amount and heat exchange efficiency can be improved. During this period, the cold water at the condenser cooling water outlet 94-2 of the absorption heat pump 90 can be used to heat the air through the first air supply heater 100. The switching between the two operating modes can be as follows Figure 10The switching valve group shown can also be achieved by manually changing the pipe connection;

[0413] Optionally, Figure 8-1 As shown, the first primary air heater 100a is provided, and the heat medium water inlet 100a-3 of the first primary air heater is also directly or indirectly connected to the condenser cooling water outlet 94-2; the heat medium water outlet 100a-4 of the first primary air heater is also directly or indirectly connected to the absorber cold water inlet 92-1 (not shown in the figure);

[0414] Optionally, a cold water pump (not shown in the figure) is provided on the cold water channel to which the absorber cold water inlet 92 - 1 or the condenser cooling water outlet 94 - 2 is directly or indirectly connected.

[0415] Figure 11 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0416] like Figure 11 As shown, the boiler flue gas waste heat recovery and utilization system, in Figure 3-1 On the basis of the above, there are also: a steam turbine 25, a condenser 27, a condensate pump 26, a low-pressure heater 29, a deaerator 30, a feed water pump 32, and a high-pressure heater 31; wherein,

[0417] The steam turbine 25 is provided with a steam turbine steam inlet 25-1, a steam turbine steam outlet 25-2, a steam turbine high-pressure extraction steam outlet 25-5, and a steam turbine low-pressure extraction steam outlet 25-4;

[0418] The condenser 27 is provided with a condenser steam inlet 27-1 and a condenser working medium water outlet 27-2;

[0419] The condensate pump 26 is provided with a condensate pump inlet 26-1 and a condensate pump outlet 26-2;

[0420] The low-pressure heater 29 is provided with a low-pressure heater working medium water inlet 29-1, a low-pressure heater working medium water outlet 29-2, and a low-pressure heater extraction steam inlet 29-3;

[0421] The deaerator 30 is provided with a deaerator working medium water inlet 30-1 and a deaerator working medium water outlet 30-2;

[0422] The water pump 32 is provided with a water pump inlet 32-1 and a water pump outlet 32-2;

[0423] The high-pressure heater 31 is provided with a high-pressure heater working medium water inlet 31-1, a high-pressure heater working medium water outlet 31-2 and a high-pressure heater extraction steam inlet 31-3;

[0424] The boiler 1 is further provided with a boiler steam outlet 1-4 and a boiler working medium water inlet 1-5;

[0425] The boiler steam outlet 1-4 is directly or indirectly connected to the turbine steam inlet 25-1; the turbine steam outlet 26-2 is directly or indirectly connected to the condenser steam inlet 27-1; the condenser working water outlet 27-2 is directly or indirectly connected to the condensate pump inlet 26-1; the condensate pump outlet 26-2 is directly or indirectly connected to the low-pressure heater working water inlet 29-1; the low-pressure heater working water outlet 29-2 is directly or indirectly connected to the deaerator working water inlet 30-1; The deaerator working medium water outlet 30-2 is directly or indirectly connected to the feed water pump inlet 32-1; the feed water pump outlet 32-2 is directly or indirectly connected to the high-pressure heater working medium water inlet 31-1; the high-pressure heater working medium water outlet 31-2 is directly or indirectly connected to the boiler working medium water inlet 1-5; the low-pressure heater extraction steam inlet 29-3 is directly or indirectly connected to the turbine low-pressure extraction steam outlet 25-4; the high-pressure heater extraction steam inlet 31-3 is directly or indirectly connected to the turbine high-pressure extraction steam outlet 25-5;

[0426] The bypass economizer working medium water outlet 15-4 is directly or indirectly connected to the boiler working medium water inlet 1-5; the bypass economizer working medium water inlet 15-3 is directly connected to the condensate pump outlet 26-2 or indirectly connected through other equipment (such as a heater, a water pump, a water tank, etc.);

[0427] The working process is as follows:

[0428] The high-pressure and high-temperature steam generated by combustion in the boiler 1 performs work in the turbine 25, and its pressure and temperature decrease. The steam is then discharged into the condenser 27 through the turbine steam outlet 25-2 and the condenser working water inlet 27-1. After being cooled in the condenser 27, the steam condenses into working water (condensate), which flows out of the condenser 27 through the condenser working water outlet 27-2. Then, driven by the condensate pump 26, a portion of the working water is sent to the low-pressure heater 29 through the low-pressure heater working water inlet 29-1. The working water is heated in the low-pressure heater 29 by the extraction steam from the low-pressure extraction steam outlet 25-4 of the steam turbine. The heated working water flows out of the low-pressure heater 29 through the working water outlet 29-2 of the low-pressure heater and is sent to the deaerator 30 for deoxygenation. The deoxygenated working water is driven by the feed water pump 32 and sent to the working water inlet 31-1 of the high-pressure heater 31 to enter the high-pressure heater 31. The working water is heated in the high-pressure heater 31 by the extraction steam from the high-pressure extraction steam outlet 25-4 of the steam turbine. The extracted steam from the steam outlet 25-5 is heated and the heated working water flows out of the high-pressure heater 31 through the high-pressure heater working water outlet 31-2; a part of the working water is directly or indirectly sent to the bypass economizer working water inlet 15-3 through other equipment (such as an optional heater, water pump, buffer water tank, etc.) to enter the bypass economizer 15, and the working water and the flue gas are heat-exchanged to absorb the waste heat of the flue gas and the temperature is increased, and then flows out of the bypass economizer 15 through the bypass economizer working water outlet 15-4; all or part of the working water from the high-pressure heater 31 and the bypass economizer 15 respectively are sent to the boiler 1 through the boiler working water inlet 1-5; the coal from the boiler coal inlet 1-1 and the air from the boiler air inlet 1-2 undergo a combustion reaction to release heat, which heats the working water from the boiler working water inlet 1-5 and generates high-pressure and high-temperature steam, which is sent to the steam turbine 26 through the boiler steam outlet 1-4 to continue to do work, and the cycle continues.

[0429] Utilizing flue gas waste heat and the bypass economizer 15 to heat a portion of the working water from the turbine condenser can save on the turbine extraction steam used to heat the working water in conventional technologies. This extraction steam can be returned to the turbine for power generation or extracted for external heat supply. This reduces coal consumption for power generation while also increasing the turbine's power generation capacity, heating capacity, and heat-to-power ratio. It can also reduce the minimum steam flow rate into the low-pressure cylinder, improving the unit's peak-shaving capability and flexibility. Furthermore, converting low-grade flue gas waste heat into high-grade flue gas heat at the bypass economizer flue gas inlet 15-1 heats the working water from the condenser working water outlet 27-2 to the required temperature for entry into the boiler working water inlet 1-5 (conventional technologies require this heat to be returned to the high-pressure heater system for heating before it can be delivered to the boiler working water inlet 1-5). This saves on high-stage turbine extraction steam. According to steam turbine principles, steam with the same heat but at a higher temperature has greater work capacity in the turbine, resulting in high heat utilization efficiency and significantly improved energy efficiency.

[0430] Generally, a boiler is also provided with an economizer, and the boiler working water inlet 1-5 may be the working water inlet of the economizer (not shown in the figure).

[0431] Optionally, a first low-pressure heater 28 is provided. The first low-pressure heater 28 is provided with a first low-pressure heater working water inlet 28-1, a first low-pressure heater working water outlet 28-2, and a first low-pressure heater extraction steam inlet 28-3. The condensate pump outlet 26-2 is directly or indirectly connected to both the low-pressure heater working water inlet 29-1 and the bypass economizer working water inlet 15-3 through the first low-pressure heater 28. The working water from the condensate pump 26 is heated by the first low-pressure heater 28 and then delivered to the low-pressure heater 29 and the bypass economizer 15, respectively. Generally, the first low-pressure heater 28 is heated by extraction steam from the steam turbine 25 (the first low-pressure heater extraction steam inlet 28-3 and the first low-pressure extraction steam outlet 25-3 of the steam turbine) or other heat sources.

[0432] Optionally, the low-pressure heater 29 is a one-stage or multi-stage low-pressure heater (one stage is shown in the figure); the high-pressure heater 31 is a one-stage or multi-stage high-pressure heater (one stage is shown in the figure); the first low-pressure heater 28 is a one-stage or multi-stage low-pressure heater (one stage is shown in the figure); optionally, the turbine high-pressure extraction steam outlet 25-5 is one-stage or multi-stage (one stage is shown in the figure); optionally, the turbine low-pressure extraction steam outlet 25-4 is one-stage or multi-stage (one stage is shown in the figure).

[0433] Generally speaking, steam turbines are used to drive generators to generate electricity. Therefore, if the efficiency of the steam turbine is improved or the working capacity is improved, the coal consumption for power generation or power supply can be reduced.

[0434] Figure 11-1 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0435] like Figure 11-1 As shown, Figure 11 The main difference is that the bypass economizer working medium water inlet 15-3 is directly or indirectly connected to the feed water pump outlet 32-2.

[0436] The working process is:

[0437] The working water from the feed water pump outlet 32-2 is sent to the bypass economizer working water inlet 15-3, and is heated by the bypass economizer 15 before being sent to the boiler working water inlet 1-5. Figure 11The temperature of the working water from the condensate pump outlet 26-2 or the first low-pressure heater working water outlet 28-2 is higher. Under the condition of the same heat exchange capacity of the bypass economizer 15, more working water flow can be heated and more high-stage steam turbine extraction steam can be saved, so the heat utilization efficiency is higher and the energy saving efficiency is higher.

[0438] Figure 11-2 It is a structural schematic diagram of another embodiment of the boiler flue gas waste heat recovery and utilization system of the present utility model.

[0439] like Figure 11-2 As shown, Figure 11 The main difference is that when the bypass economizer 15 includes a first-stage bypass heat exchange module 15a and a second-stage bypass heat exchange module 15b connected in series, the deaerator 30 is merged with the first bypass deaerator 30C, the feed water pump 32 is merged with the first bypass feed water pump 32C, and the second-stage bypass heat exchange module working fluid water outlet 15b-4 and the low-pressure heater working fluid water outlet 29-2 are directly or indirectly connected to the first-stage bypass heat exchange working fluid water inlet 15a-3 and the high-pressure heater working fluid water inlet 31-1 through the deaerator 30 and the feed water pump 32.

[0440] The working process is as follows:

[0441] The working water from the condensate pump 26 is sent directly or through other equipment (such as the first low-pressure heater 28, etc.) to the low-pressure heater 29 for heating using the low-pressure steam extracted from the steam turbine, and then flows out of the low-pressure heater 29; one way is directly or through other equipment (such as the bypass feed water pump, bypass deaerator, bypass buffer water tank, etc.) to enter the second-stage bypass heat exchange module 15b through the working water inlet 15b-3 of the second-stage bypass heat exchange module, and after being heated by the flue gas, it flows out of the second-stage bypass heat exchange module through the working water outlet 15b-4 of the second-stage bypass heat exchange module; The working water from the low-pressure heater 29 and the working water from the second-stage bypass heat exchange module 15b are both sent to the deaerator 30 for deoxygenation; the working water after deoxygenation in the deaerator 30 is pressurized by the feed water pump 32, and then sent to the high-pressure heater 31 to be heated by the high-pressure steam extracted from the steam turbine and then flows out of the high-pressure heater 31; it is sent to the first-stage bypass heat exchange module 15a to be heated by the flue gas and then flows out of the first-stage bypass heat exchange module 15a; the working water from the high-pressure heater 31 and the working water from the first-stage bypass heat exchange module 15a are both sent to the boiler working water inlet 1-5.

[0442] The advantage of this implementation is that the deaerator and feedwater pump on the turbine side can be used, and the bypass economizer can be divided into high-pressure and low-pressure sections, reducing investment. However, the pipeline will increase.

[0443] The above description is only an exemplary embodiment of the present invention and is not intended to limit the scope of the present invention. Equivalent changes, modifications and combinations made by those skilled in the art without departing from the concept and principle of the present invention should all fall within the scope of the present invention.

Claims

1. A boiler flue gas waste heat recovery and utilization system, characterized in that: include: Boiler, bypass economizer, air preheater, dust collector, desulfurization tower, chimney, blower, primary fan, and coal mill; among which, The boiler is provided with a coal inlet, a boiler air supply inlet, and a boiler smoke outlet; The bypass economizer is provided with a bypass economizer flue gas inlet, a bypass economizer flue gas outlet, a bypass economizer working fluid water inlet, and a bypass economizer working fluid water outlet; The air preheater is provided with an air preheater smoke inlet, an air preheater smoke outlet, an air preheater air supply inlet, an air preheater air supply outlet, an air preheater primary air inlet, and an air preheater primary air outlet; The dust collector is provided with a dust collector inlet and a dust collector outlet; The desulfurization tower is provided with a desulfurization tower flue gas inlet and a desulfurization tower flue gas outlet; The blower is provided with a blower inlet and a blower outlet; The primary fan is provided with a primary fan inlet and a primary fan outlet; The coal mill is provided with a coal inlet, a primary air inlet and an air-powder outlet; The boiler flue gas outlet is connected to the air preheater flue gas inlet and the bypass economizer flue gas inlet at the same time; the air preheater flue gas outlet and the bypass economizer flue gas outlet are both connected to the dust collector inlet; the dust collector outlet is connected to the desulfurization tower flue gas inlet; the desulfurization tower flue gas outlet is connected to the chimney; The working medium water outlet of the bypass economizer is connected to the next process link or heat user; The blower outlet is connected to the air supply inlet of the air preheater; the air supply outlet of the air preheater is connected to the air supply inlet of the boiler; The primary air fan outlet is connected to the primary air inlet of the air preheater and the primary air inlet of the coal mill; the primary air outlet of the air preheater is connected to the primary air inlet of the coal mill; the pulverized air outlet of the coal mill is connected to the coal inlet of the boiler; A bypass air duct is provided between the air supply channel connected to the air supply outlet of the air preheater and the primary air channel connected to the primary air outlet of the air preheater; a bypass baffle and / or a bypass fan is provided on the bypass air duct.

2. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: An induced draft fan is connected in series on the flue gas channel between the dust collector outlet and the desulfurization tower.

3. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: The bypass economizer includes a first-stage bypass heat exchange module and a second-stage bypass heat exchange module connected in series; the first-stage bypass heat exchange module is provided with a bypass economizer flue gas inlet, a first-stage bypass heat exchange module flue gas outlet, a first-stage bypass heat exchange module working fluid water inlet, and a bypass economizer working fluid water outlet; the second-stage bypass heat exchange module is provided with a second-stage bypass heat exchange module flue gas inlet, a bypass economizer flue gas outlet, a bypass economizer working fluid water inlet, and a second-stage bypass heat exchange module working fluid water outlet; the first-stage bypass heat exchange module flue gas outlet is connected to the second-stage bypass heat exchange module flue gas inlet, and the second-stage bypass heat exchange module working fluid water outlet is connected to the first-stage bypass heat exchange module working fluid water inlet.

4. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: A bypass deaerator is provided on the working medium water channel connected to the working medium water inlet of the bypass economizer.

5. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: A buffer water tank is provided on the working medium water channel connected to the working medium water inlet of the bypass economizer.

6. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: It is also equipped with a flue heat exchanger, a supply air heater, and a primary air heater; The flue heat exchanger is provided with a flue heat exchanger flue gas inlet, a flue heat exchanger flue gas outlet, a flue heat exchanger air supply heat medium water inlet, a flue heat exchanger air supply heat medium water outlet, a flue heat exchanger primary air heat medium water inlet, and a flue heat exchanger primary air heat medium water outlet; the air supply heater is provided with an air supply heater air inlet, an air supply heater air outlet, an air supply heater heat medium water inlet, and an air supply heater heat medium water outlet; the primary air heater is provided with a primary air heater primary air inlet, a primary air heater primary air outlet, a primary air heater heat medium water inlet, and a primary air heater heat medium water outlet; The air supply channel of the air supply heater is connected in series to the air supply channel between the air supply fan outlet and the air supply inlet of the air preheater, the air supply inlet of the air supply heater is connected to the air supply fan outlet, and the air supply outlet of the air supply heater is connected to the air supply inlet of the air preheater; The primary air channel of the primary air heater is connected in series to the primary air channel connected to the primary fan outlet, the primary air inlet of the primary air heater is connected to the primary fan outlet, and the primary outlet of the primary air heater is connected to the primary air inlet of the air preheater and the primary air inlet of the coal mill at the same time; The heat medium water outlet of the flue heat exchanger for air supply is connected to the heat medium water inlet of the air supply heater, and the heat medium water outlet of the air supply heater is connected to the heat medium water inlet of the flue heat exchanger for air supply; the heat medium water outlet of the flue heat exchanger for primary air is connected to the heat medium water inlet of the primary air heater, and the heat medium water outlet of the primary air heater is connected to the heat medium water inlet of the flue heat exchanger for primary air; The flue gas channel of the flue heat exchanger is connected in series on the flue gas channel between the flue gas outlet of the air preheater and the inlet of the dust collector, the flue gas inlet of the flue heat exchanger is connected to the flue gas outlet of the air preheater, the flue gas outlet of the flue heat exchanger is connected to the inlet of the dust collector, the flue gas outlet of the bypass economizer is connected to the flue gas channel between the flue gas outlet of the air preheater and the flue gas inlet of the flue heat exchanger, or the flue gas outlet of the bypass economizer is connected to the flue gas channel between the flue gas outlet of the flue heat exchanger and the inlet of the dust collector; or, the flue gas channel of the flue heat exchanger is connected in series on the flue gas channel between the dust collector and the flue gas inlet of the desulfurization tower, the flue gas inlet of the flue heat exchanger is connected to the dust collector outlet, and the flue gas outlet of the flue heat exchanger is connected to the flue gas inlet of the desulfurization tower.

7. The boiler flue gas waste heat recovery and utilization system according to claim 6, characterized in that: A heat medium water circulation pump is connected in series on the heat medium water channel connected to the heat medium water inlet of the flue heat exchanger or the heat medium water outlet of the flue heat exchanger.

8. The boiler flue gas waste heat recovery and utilization system according to claim 6, characterized in that: The flue heat exchanger supply air heat medium water inlet and the flue heat exchanger primary air heat medium water inlet are merged into the flue heat exchanger heat medium water inlet, the flue heat exchanger supply air heat medium water outlet and the flue heat exchanger primary air heat medium water outlet are merged into the flue heat exchanger heat medium water outlet, the flue heat exchanger heat medium water outlet is simultaneously connected to the supply air heater heat medium water inlet and the primary air heater heat medium water inlet, the supply air heater heat medium water outlet and the primary air heater heat medium water outlet are both connected to the flue heat exchanger heat medium water inlet.

9. The boiler flue gas waste heat recovery and utilization system according to claim 6, characterized in that: The flue heat exchanger includes a primary air flue heat exchanger and a supply air flue heat exchanger; the primary air flue heat exchanger is provided with a primary air flue heat exchanger flue gas inlet, a primary air flue heat exchanger flue gas outlet, a flue heat exchanger primary air heat medium water inlet, and a flue heat exchanger primary air heat medium water outlet; the supply air flue heat exchanger is provided with a supply air flue heat exchanger flue gas inlet, a supply air flue heat exchanger flue gas outlet, a flue heat exchanger supply air heat medium water inlet, and a flue heat exchanger supply air heat medium water outlet; the primary air flue heat exchanger flue gas inlet and the supply air flue heat exchanger flue gas inlet together constitute the flue heat exchanger flue gas inlet; the primary air flue heat exchanger smoke gas outlet and the supply air flue heat exchanger smoke gas outlet together constitute the flue heat exchanger smoke gas outlet.

10. The boiler flue gas waste heat recovery and utilization system according to claim 6, characterized in that: The flue heat exchanger is the heating section of the separate heat pipe heat exchanger, and the primary air heater and the supply air heater are both the heat releasing sections of the separate heat pipe heat exchanger.

11. The boiler flue gas waste heat recovery and utilization system according to claim 1, characterized in that: A low-temperature air preheater is also provided; the low-temperature air preheater is provided with a low-temperature air preheater flue gas inlet, a low-temperature air preheater flue gas outlet, a low-temperature air preheater air supply inlet, a low-temperature air preheater air supply outlet, a low-temperature air preheater primary air inlet, and a low-temperature air preheater primary air outlet; The low-temperature air preheater air supply inlet is connected to the air blower outlet; the low-temperature air preheater air supply outlet is connected to the air preheater air supply inlet; the low-temperature air preheater primary air inlet is connected to the primary fan outlet; the low-temperature air preheater primary air outlet is connected to both the air preheater primary air inlet and the coal mill primary air inlet; The low-temperature air preheater flue gas channel is connected in series on the flue gas channel between the air preheater flue gas outlet and the dust collector inlet, and the low-temperature air preheater flue gas inlet is connected to the air preheater flue gas outlet; the low-temperature air preheater flue gas outlet is connected to the dust collector inlet, and the bypass economizer flue gas outlet is connected to the flue gas channel between the air preheater flue gas outlet and the low-temperature air preheater flue gas inlet, or the bypass economizer flue gas outlet is connected to the flue gas channel between the low-temperature air preheater flue gas outlet and the dust collector inlet.

12. The boiler flue gas waste heat recovery and utilization system according to claim 11, characterized in that: The low-temperature air preheater includes a primary air low-temperature air preheater and a supply air low-temperature air preheater; the primary air low-temperature air preheater is provided with a primary air low-temperature air preheater flue gas inlet, a primary air low-temperature air preheater flue gas outlet, a low-temperature air preheater primary air inlet, and a low-temperature air preheater primary air outlet; The air supply low-temperature air preheater is provided with an air supply low-temperature air preheater flue gas inlet, an air supply low-temperature air preheater flue gas outlet, a low-temperature air preheater air supply inlet, and a low-temperature air preheater air supply outlet; the primary air low-temperature air preheater flue gas inlet and the air supply low-temperature air preheater flue gas inlet are both connected to the low-temperature air preheater flue gas inlet; the primary air low-temperature air preheater flue gas outlet and the air supply low-temperature air preheater flue gas outlet are both connected to the low-temperature preheater flue gas outlet.

13. The boiler flue gas waste heat recovery and utilization system according to claim 11, characterized in that: The low-temperature air preheater includes a plurality of heat exchange modules.

14. The boiler flue gas waste heat recovery and utilization system according to claim 11, characterized in that: The low-temperature air preheater is a heat pipe heat exchanger.

15. The boiler flue gas waste heat recovery and utilization system according to claim 11, characterized in that: The low-temperature air preheater includes a supply air cage heat exchanger and a primary air cage heat exchanger; The air supply cage heat exchanger comprises an air supply cage heat exchanger shell; a rotatable air supply cage heat exchanger core is provided in the air supply cage heat exchanger shell; the air supply cage heat exchanger core comprises a front end plate of the air supply cage heat exchanger core, a rear end plate of the air supply cage heat exchanger core, and a plurality of air supply cage heat exchanger core heat exchange tubes; the front end plate of the air supply cage heat exchanger core is provided with a plurality of through holes in the front end plate of the air supply cage heat exchanger core, and the rear end plate of the air supply cage heat exchanger core is correspondingly provided with a plurality of through holes in the rear end plate of the air supply cage heat exchanger core; both ends of each of the heat exchange tubes of the air supply cage heat exchanger core are respectively connected to the through holes of the front end plate of the air supply cage heat exchanger core and the corresponding through holes of the rear end plate of the air supply cage heat exchanger core; The line connecting the center of the front end plate of the air rotary cage heat exchanger core and the center of the rear end plate of the air supply rotary cage heat exchanger core is the center line, and the air supply rotary cage heat exchanger core can rotate with the center line as the axis of the air supply rotary cage heat exchanger core; the flow channels in the heat exchange tubes of all the air supply rotary cage heat exchanger cores constitute the air supply channel of the air supply rotary cage heat exchanger core; the flow channel formed between the front end plate of the air supply rotary cage heat exchanger core, the rear end plate of the air supply rotary cage heat exchanger core, the outer surface of the heat exchange tubes of each of the air supply rotary cage heat exchanger cores and the outer shell of the air supply rotary cage heat exchanger is the air supply rotary cage heat exchanger core smoke channel of the air supply rotary cage heat exchanger; an air supply rotary cage heat exchanger is provided on one side of the air supply rotary cage heat exchanger shell at the smoke channel of the air supply rotary cage heat exchanger core The smoke inlet, the smoke outlet of the air supply cage heat exchanger shell at the smoke channel of the air supply cage heat exchanger core is provided on the opposite side of the above-mentioned side of the air supply cage heat exchanger shell; an air supply cage heat exchanger air inlet bellows is provided between the front end plate of the air supply cage heat exchanger core and the front end portion of the air supply cage heat exchanger shell; the air supply cage heat exchanger shell at the air supply inlet bellows is provided with an air supply cage heat exchanger air inlet; an air supply cage heat exchanger air outlet bellows is provided between the rear end portion of the air supply cage heat exchanger shell and the rear end plate of the air supply cage heat exchanger core, and the air supply cage heat exchanger shell at the air supply outlet bellows is provided with an air supply cage heat exchanger air outlet The air supply channel of the air-supplying cage heat exchanger core passes through the front end plate of the air-supplying cage heat exchanger core, the air supply inlet bellows of the air-supplying cage heat exchanger and is communicated with the air supply inlet of the air-supplying cage heat exchanger in sequence, and the air supply channel of the air-supplying cage heat exchanger core passes through the rear end plate of the air-supplying cage heat exchanger core, the air supply outlet bellows of the air-supplying cage heat exchanger and is communicated with the air supply outlet of the air-supplying cage heat exchanger in sequence; or, an air supply inlet bellows and an air supply outlet bellows isolated from each other are provided between the front end plate of the air-supplying cage heat exchanger core and the front end portion of the air supplying cage heat exchanger shell; an air supply outlet is provided on the air supplying cage heat exchanger shell at the air supply outlet bellows of the air supplying cage heat exchanger;An air supply inlet is provided on the shell of the air supply cage heat exchanger at the air supply inlet bellows of the air supply cage heat exchanger; an air supply cage heat exchanger turning bellows is provided between the rear end plate of the air supply cage heat exchanger core and the rear end portion of the air supply cage heat exchanger shell; the flow channel in the heat exchange pipe of the air supply cage heat exchanger core connected to the through hole of the front end plate of the air supply cage heat exchanger core in the air supply inlet bellows of the air supply cage heat exchanger constitutes an air inlet channel of the air supply cage heat exchanger core; the flow channel in the heat exchange pipe of the air supply cage heat exchanger core connected to the through hole of the front end plate of the air supply cage heat exchanger core in the air supply outlet bellows constitutes an air return channel of the air supply cage heat exchanger core duct; the air inlet channel of the air supply cage heat exchanger core and the air return channel of the air supply cage heat exchanger core constitute the air supply channel of the air supply cage heat exchanger core; the air supply cage heat exchanger air inlet, the air supply cage heat exchanger air inlet bellows, the air supply cage heat exchanger core air inlet channel, the air supply cage heat exchanger turning bellows, the air supply cage heat exchanger core return channel, the air supply cage heat exchanger air outlet bellows, and the air supply cage heat exchanger air outlet are connected in sequence; all of the air supply cage heat exchanger air inlets together constitute the air supply inlet of the low-temperature air preheater; all of the air supply cage heat exchanger air outlets together constitute the air supply outlet of the low-temperature air preheater; The primary air rotary cage heat exchanger includes a primary air rotary cage heat exchanger shell; a rotatable primary air rotary cage heat exchanger core is provided in the primary air rotary cage heat exchanger shell; the primary air rotary cage heat exchanger core includes a primary air rotary cage heat exchanger core front end plate, a primary air rotary cage heat exchanger core rear end plate, and a plurality of primary air rotary cage heat exchanger core heat exchange tubes; the primary air rotary cage heat exchanger core front end plate is provided with a plurality of primary air rotary cage heat exchanger core front end plate through holes, and the primary air rotary cage heat exchanger core rear end plate is correspondingly provided with a plurality of primary air rotary cage heat exchanger core rear end plate through holes; both ends of each of the primary air rotary cage heat exchanger core heat exchange tubes are respectively aligned with the primary air rotary cage heat exchanger core front end plate through holes and the corresponding primary air rotary cage heat exchanger core rear end plate. The plate is connected with the through-hole; the center line of the center of the front end plate of the primary air rotary cage heat exchanger core and the center line of the rear end plate of the primary air rotary cage heat exchanger core is used as the center line, and the primary air rotary cage heat exchanger core can rotate with the center line as the axis of the primary air rotary cage heat exchanger core; the flow channels in the heat exchange tubes of all the primary air rotary cage heat exchanger cores constitute the primary air channel of the primary air rotary cage heat exchanger core; the flow channel formed between the front end plate of the primary air rotary cage heat exchanger core, the rear end plate of the primary air rotary cage heat exchanger core, the outer surface of the heat exchange tubes of each primary air rotary cage heat exchanger core and the outer shell of the primary air rotary cage heat exchanger is the primary air rotary cage heat exchanger core flue gas channel of the primary air rotary cage heat exchanger; the primary air rotary cage heat exchanger core flue gas channel at the primary air rotary cage heat exchanger core A primary air rotary cage heat exchanger smoke inlet is provided on one side of the air rotary cage heat exchanger shell, and a primary air rotary cage heat exchanger smoke outlet is provided on the opposite side of the above-mentioned side of the primary air rotary cage heat exchanger shell at the smoke channel of the primary air rotary cage heat exchanger core; a primary air rotary cage heat exchanger primary air inlet bellows is provided between the front end plate of the primary air rotary cage heat exchanger core and the front end portion of the primary air rotary cage heat exchanger shell; a primary air rotary cage heat exchanger primary air inlet bellows is provided on the primary air rotary cage heat exchanger shell at the primary air rotary cage heat exchanger primary air inlet bellows; a primary air rotary cage heat exchanger primary air outlet bellows is provided between the rear end portion of the primary air rotary cage heat exchanger shell and the rear end plate of the primary air rotary cage heat exchanger core, and the primary air rotary cage heat exchanger primary air outlet The primary air rotary cage heat exchanger shell at the bellows is provided with a primary air rotary cage heat exchanger primary air outlet, and the core primary air channel is connected with the primary air rotary cage heat exchanger primary air inlet in sequence through the primary air rotary cage heat exchanger core front end plate, the primary air rotary cage heat exchanger primary air inlet bellows, and the primary air channel of the primary air rotary cage heat exchanger core is connected with the primary air rotary cage heat exchanger primary air outlet in sequence through the primary air rotary cage heat exchanger core rear end plate, the primary air rotary cage heat exchanger primary air outlet bellows; or, a primary air rotary cage heat exchanger primary air inlet bellows and a primary air rotary cage heat exchanger primary air outlet bellows isolated from each other are provided between the primary air rotary cage heat exchanger core front end plate and the front end portion of the primary air rotary cage heat exchanger shell;The primary air rotary cage heat exchanger shell is provided with a primary air outlet of the primary air outlet wind box of the primary air rotary cage heat exchanger; the primary air outlet of the primary air outlet wind box of the primary air inlet wind box of the primary air rotary cage heat exchanger shell is provided with a primary air inlet of the primary air rotary cage heat exchanger; a primary air inlet wind box is provided between the rear end plate of the primary air rotary cage heat exchanger core and the rear end of the primary air rotary cage heat exchanger shell; the flow channel in the heat exchange pipe of the primary air rotary cage heat exchanger core connected to the through hole of the front end plate of the primary air rotary cage heat exchanger core in the primary air inlet wind box of the primary air rotary cage heat exchanger constitutes an air inlet channel of the primary air rotary cage heat exchanger core; the primary air rotary cage heat exchanger connected to the through hole of the front end plate of the primary air rotary cage heat exchanger core in the primary air outlet wind box The flow channel in the heat exchange tube of the cage heat exchanger core constitutes a primary air rotary cage heat exchanger core return air channel; the primary air rotary cage heat exchanger core air inlet channel and the primary air rotary cage heat exchanger core return air channel constitute the core primary air channel; the primary air rotary cage heat exchanger primary air inlet bellows, the primary air rotary cage heat exchanger core air inlet channel, the primary air rotary cage heat exchanger turning bellows, the primary air rotary cage heat exchanger core return air channel, the primary air rotary cage heat exchanger primary air outlet bellows, and the primary air rotary cage heat exchanger primary air outlet are connected in sequence; all the primary air rotary cage heat exchanger primary air inlets together constitute the low-temperature air preheater primary air inlet; all the primary air rotary cage heat exchanger primary air outlets together constitute the low-temperature air preheater primary air outlet; The flue gas inlets of all the air supply rotary heat exchangers and the flue gas inlets of all the primary air rotary heat exchangers together constitute the flue gas inlet of the low-temperature air preheater; the flue gas outlets of all the air supply rotary heat exchangers and the flue gas outlets of all the primary air rotary heat exchangers together constitute the flue gas outlet of the low-temperature air preheater.

16. The boiler flue gas waste heat recovery and utilization system according to claim 15, characterized in that: An air supply cage heat exchanger core driving device is also provided; and a primary air cage heat exchanger core driving device is also provided.

17. The boiler flue gas waste heat recovery and utilization system according to claim 15, characterized in that: The core heat exchange tubes of the air supply rotary heat exchanger adopt outer fin tubes and inner fin tubes; the core heat exchange tubes of the primary air rotary heat exchanger adopt outer fin tubes and inner fin tubes.

18. The boiler flue gas waste heat recovery and utilization system according to claim 11, characterized in that: The low-temperature air preheater includes a supply air low-temperature air preheater and a primary air low-temperature air preheater; the supply air low-temperature air preheater includes a supply air rotary heat pipe heat exchanger; the primary air low-temperature air preheater includes a primary air rotary heat pipe heat exchanger; The rotary heat pipe heat exchanger includes a heat pipe heat exchanger shell, a heat pipe heat exchanger chamber partition, and a heat pipe heat exchanger core; the heat pipe heat exchanger shell forms a closed heat pipe heat exchanger chamber; the heat pipe heat exchanger chamber partition is arranged in the heat pipe heat exchanger chamber and divides the heat pipe heat exchanger chamber into a heat pipe heat exchanger flue gas channel and a heat pipe heat exchanger air channel isolated from each other; a heat pipe heat exchanger flue gas inlet is opened on one side of the heat pipe heat exchanger shell at the heat pipe heat exchanger flue gas channel, A heat pipe heat exchanger smoke outlet is provided on the other side of the heat pipe heat exchanger shell at the heat pipe heat exchanger smoke channel; a heat pipe heat exchanger air inlet is provided on one side of the heat pipe heat exchanger shell at the heat pipe heat exchanger air channel, and a heat pipe heat exchanger air outlet is provided on the other side of the heat pipe heat exchanger shell at the heat pipe heat exchanger air channel; a heat pipe heat exchanger core through hole is provided on the heat pipe heat exchanger chamber partition; the heat pipe heat exchanger core includes multiple heat pipes and a core partition; the core partition is provided with a heat pipe heat exchanger core through hole; the heat pipe heat exchanger core includes multiple heat pipes and a core partition; the core partition is provided with a heat pipe heat exchanger core through hole; the heat pipe heat exchanger core includes multiple heat pipes and a core partition; the heat pipe heat exchanger core includes a heat pipe heat exchanger core through hole ... There are heat pipe through holes equal to the number of the heat pipes; the heat pipes all pass through the heat pipe through holes, and the heat pipes are divided into two sections with the core partition as the boundary; the heat pipes are sealed and connected to the core partition; the heat pipe heat exchanger core passes through the heat pipe heat exchanger core through holes, and the core partition is tightly fitted with the heat pipe heat exchanger chamber partition; one section of the heat pipe is located in the heat pipe heat exchanger flue gas channel as the heat pipe heating section, and the other section of the heat pipe is located in the heat pipe heat exchanger air channel as the heat pipe heating section The heat pipe is a heat releasing section; all the heat receiving sections of the heat pipe constitute the heat receiving section of the heat pipe heat exchanger core; all the heat releasing sections of the heat pipe constitute the heat releasing section of the heat pipe heat exchanger core; the straight line passing through the center of the core partition is used as the axis of the heat pipe heat exchanger core, and the heat pipe heat exchanger core can rotate around the axis of the heat pipe heat exchanger core; the vertical height of the heat releasing section of the heat pipe is higher than that of the heat receiving section of the heat pipe; the vertical height of the heat releasing section of the heat pipe heat exchanger core is higher than that of the heat receiving section of the heat pipe heat exchanger core.

19. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The rotary heat pipe heat exchanger is further provided with a plurality of first heat pipes; the heat pipe heat exchanger chamber partition is further provided with first heat pipe through holes equal to the number of the first heat pipes; the first heat pipes all pass through the first heat pipe through holes, and the first heat pipes are divided into two sections with the heat pipe heat exchanger chamber partition as the boundary, the section of the first heat pipe located in the heat pipe heat exchanger flue gas channel serves as the first heat pipe heating section, and the other section of the first heat pipe located in the heat pipe heat exchanger air channel serves as the first heat pipe heat release section; the first heat pipes are sealedly connected to the first heat pipe through holes on the heat pipe heat exchanger chamber partition; the vertical height of the first heat pipe heat exchanger core heat release section is higher than the first heat pipe heat exchanger core heating section; The air inlets of all the air supply rotary heat pipe heat exchangers together constitute the air supply inlet of the low-temperature air preheater, and the air outlets of all the air supply rotary heat pipe heat exchangers together constitute the air supply outlet of the low-temperature air preheater; the flue gas inlets of all the air supply rotary heat pipe heat exchangers together constitute the flue gas inlet of the air supply low-temperature air preheater; the flue gas outlets of all the air supply rotary heat pipe heat exchangers together constitute the flue gas outlet of the air supply low-temperature air preheater; The air inlets of all primary air rotary heat pipe heat exchangers together constitute the primary air inlet of the low-temperature air preheater, and the air outlets of all primary air rotary heat pipe heat exchangers together constitute the primary air outlet of the low-temperature air preheater; the flue gas inlets of all primary air rotary heat pipe heat exchangers together constitute the flue gas inlet of the primary air low-temperature air preheater; the flue gas outlets of all primary air rotary heat pipe heat exchangers together constitute the flue gas outlet of the primary air low-temperature air preheater; The supply air low-temperature air preheater flue gas inlet and the primary air low-temperature air preheater flue gas inlet together constitute the low-temperature air preheater flue gas inlet; the supply air low-temperature air preheater flue gas outlet and the primary air low-temperature air preheater flue gas outlet together constitute the low-temperature air preheater flue gas outlet.

20. The boiler flue gas waste heat recovery and utilization system according to claim 19, characterized in that: The flue gas channels of the heat pipe heat exchanger of the rotary heat pipe heat exchanger are interconnected; the air channels of the heat pipe heat exchanger of the air supply rotary heat pipe heat exchanger are interconnected; and the air channels of the heat pipe heat exchanger of the primary air rotary heat pipe heat exchanger are interconnected.

21. The boiler flue gas waste heat recovery and utilization system according to claim 20, characterized in that: The heat pipe heat exchanger is also provided with a heat pipe heat exchanger core driving device.

22. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The outer diameter of the core partition is larger than the inner diameter of the heat pipe heat exchanger core through hole of the heat pipe heat exchanger chamber partition; the core partition is located on one side of the heat pipe heat exchanger air supply channel of the heat pipe heat exchanger chamber partition.

23. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The heat pipe heat exchanger core is also provided with a core heating section end plate and a core heat release section end plate; the heat pipe heating section is connected to the core heating section end plate through an expansion joint; the heat pipe heat release section is connected to the core heat release section end plate through an expansion joint; the heat pipe heat exchanger core rotating shaft is arranged on the core heating section end plate and the core heat release section end plate.

24. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The through hole of the heat pipe heat exchanger core is circular.

25. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The core partition is circular.

26. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The heat pipes are parallel to each other and perpendicular to the core partition.

27. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: The heat pipe heat exchanger core passes through the heat pipe heat exchanger core through hole in a direction in which the heat pipe is perpendicular to the heat pipe heat exchanger chamber partition, and the core partition remains parallel to the heat pipe heat exchanger chamber partition.

28. The boiler flue gas waste heat recovery and utilization system according to claim 18, characterized in that: A straight line passing through the center of the core partition and perpendicular to the core partition is used as the core axis of the heat pipe heat exchanger. The heat pipe heat exchanger core can rotate around the core axis of the heat pipe heat exchanger.

29. The boiler flue gas waste heat recovery system according to any one of claims 1 to 28, characterized in that: A spray tower is connected in series between the desulfurization tower and the chimney; a first air supply heater is provided on the air supply channel connected to the air supply fan inlet or the air supply fan outlet; The spray tower is provided with a spray tower flue gas inlet, a spray tower flue gas outlet, a spray tower heat medium water inlet, and a spray tower heat medium water outlet; a spray tower water receiving device is provided at the bottom of the spray tower; a spray tower water distribution device for heat medium water is provided between the spray tower flue gas inlet and the spray tower flue gas outlet; the spray tower water distribution device is connected to the spray tower heat medium water inlet, and the spray tower water receiving device is connected to the spray tower heat medium water outlet; The first air supply heater is provided with a first air supply heater air supply inlet, a first air supply heater air supply outlet, a first air supply heater heat medium water inlet, and a first air supply heater heat medium water outlet; The flue gas outlet of the desulfurization tower is connected to the flue gas inlet of the spray tower, and the flue gas outlet of the spray tower is connected to the chimney; the heat medium water inlet of the spray tower is connected to the heat medium water outlet of the first air supply heater; the heat medium water outlet of the spray tower is connected to the heat medium water inlet of the first air supply heater; When the first air supply heater is arranged on the air supply channel connected to the blower inlet, the air supply inlet of the first air supply heater is connected to the atmosphere; the air supply outlet of the first air supply heater is connected to the blower inlet; when the first air supply heater is arranged on the air supply channel connected to the blower outlet, the air supply inlet of the first air supply heater is connected to the blower outlet, and the air supply outlet of the first air supply heater is connected to the air supply inlet of the air preheater; when an air supply heater is provided, the air supply outlet of the first air supply heater is connected to the air supply inlet of the air preheater; when a low-temperature air preheater is provided, the air supply outlet of the first air supply heater is connected to the air supply inlet of the low-temperature air preheater.

30. The boiler flue gas waste heat recovery and utilization system according to claim 29, characterized in that: A first primary air heater is provided on the primary air channel connected to the primary air fan inlet; the first primary air heater is provided with a first primary air heater primary air inlet, a first primary air heater primary air outlet, a first primary air heater heat medium water inlet, and a first primary air heater heat medium water outlet; the spray tower heat medium water inlet is also connected to the first primary air heater heat medium water outlet; the spray tower heat medium water outlet is also connected to the first primary air heater heat medium water inlet; the first primary air heater primary air inlet is connected to the atmosphere; the first primary air heater primary air outlet is connected to the primary air fan inlet.

31. The boiler flue gas waste heat recovery and utilization system according to claim 30, characterized in that: A spray tower demister is provided on the flue gas channel between the spray tower water distribution device and the chimney.

32. The boiler flue gas waste heat recovery and utilization system according to claim 30, characterized in that: A packing layer is provided between the spray tower water receiving device and the spray tower water distributing device.

33. The boiler flue gas waste heat recovery and utilization system according to claim 29, characterized in that: There is also an absorption heat pump; The absorption heat pump includes an evaporator, an absorber, a generator, and a condenser. The evaporator is provided with an evaporator low-temperature heat source inlet, an evaporator low-temperature heat source outlet, an evaporator refrigerant water inlet, and an evaporator refrigerant water vapor outlet; the absorber is provided with an absorber cold water inlet, an absorber cold water outlet, an absorber refrigerant water vapor inlet, an absorber concentrated absorbent solution inlet, and an absorber dilute absorbent solution outlet; the generator is provided with a generator high-temperature heat source inlet, a generator high-temperature heat source outlet, a generator dilute absorbent solution inlet, a generator concentrated absorbent solution outlet, and a generator refrigerant water vapor outlet; the condenser is provided with a condenser cooling water inlet, a condenser cooling water outlet, a condenser refrigerant water vapor inlet, and a condenser refrigerant water outlet; The evaporator refrigerant water inlet is communicated with the condenser refrigerant water outlet; the evaporator refrigerant water vapor outlet is communicated with the absorber refrigerant water vapor inlet; the absorber concentrated absorbent solution inlet is communicated with the generator concentrated absorbent solution outlet; the absorber dilute absorbent solution outlet is communicated with the generator dilute absorbent solution inlet; the generator refrigerant water vapor outlet is communicated with the condenser refrigerant water vapor inlet; the absorber cold water outlet is communicated with the condenser cooling water inlet; the absorption heat pump constitutes a heat-increasing absorption heat pump; The heat medium water outlet of the spray tower is also connected to the low-temperature heat source inlet of the evaporator; the low-temperature heat source outlet of the evaporator is connected to the heat medium water inlet of the spray tower; The bypass economizer working fluid water outlet is connected to the generator high-temperature heat source inlet, and the generator high-temperature heat source outlet is connected to the bypass economizer working fluid water inlet; or, when a flue heat exchanger is provided, the flue heat exchanger working fluid water outlet is connected to the generator high-temperature heat source inlet, and the generator high-temperature heat source outlet is connected to the flue heat exchanger working fluid water inlet; or, when a flue heat exchanger is provided, the generator high-temperature heat source channel is connected in series on the working fluid water channel between the flue heat exchanger working fluid water outlet and the air supply heater working fluid water inlet, the flue heat exchanger working fluid water outlet is connected to the generator high-temperature heat source inlet, the generator high-temperature heat source outlet is connected to the air supply heater working fluid water inlet, and the air supply heater working fluid water outlet is connected to the flue heat exchanger working fluid water inlet.

34. The boiler flue gas waste heat recovery and utilization system according to claim 33, characterized in that: The high-temperature heat source outlet of the generator is connected to the working medium water inlet of the bypass economizer through a cooler.

35. The boiler flue gas waste heat recovery and utilization system according to claim 33, characterized in that: The heat medium water inlet of the first air supply heater is also communicated with the cooling water outlet of the condenser; the heat medium water outlet of the first air supply heater is also communicated with the cold water inlet of the absorber.

36. The boiler flue gas waste heat recovery system according to any one of claims 1 to 28, characterized in that: It also has a steam turbine, condenser, condensate pump, low-pressure heater, deaerator, feed water pump, and high-pressure heater; The steam turbine is provided with a steam turbine steam inlet, a steam turbine steam outlet, a steam turbine high-pressure extraction steam outlet, and a steam turbine low-pressure extraction steam outlet; The condenser is provided with a condenser steam inlet and a condenser working medium water outlet; The condensate pump is provided with a condensate pump inlet and a condensate pump outlet; The low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet, and a low-pressure heater extraction steam inlet; The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; The water pump is provided with a water pump inlet and a water pump outlet; The high-pressure heater is provided with a high-pressure heater working medium water inlet, a high-pressure heater working medium water outlet, and a high-pressure heater extraction steam inlet; The boiler is also provided with a boiler working medium water inlet and a boiler steam outlet; The boiler steam outlet is communicated with the turbine steam inlet; the turbine steam outlet is communicated with the condenser steam inlet; the condenser working fluid water outlet is communicated with the condensate pump inlet; the condensate pump outlet is communicated with the low-pressure heater working fluid water inlet; the low-pressure heater working fluid water outlet is communicated with the deaerator working fluid water inlet; the deaerator working fluid water outlet is communicated with the feed water pump inlet; the feed water pump outlet is communicated with the high-pressure heater working fluid water inlet; the high-pressure heater working fluid water outlet is communicated with the boiler working fluid water inlet; the low-pressure heater extraction steam inlet is communicated with the turbine low-pressure extraction steam outlet; the high-pressure heater extraction steam inlet is communicated with the turbine high-pressure extraction steam outlet; The bypass economizer working medium water outlet is connected to the boiler working medium water inlet; the bypass economizer working medium water inlet is connected to the condensate pump outlet; or the bypass economizer working medium water inlet is connected to the feed water pump outlet.

37. The boiler flue gas waste heat recovery and utilization system according to claim 29, characterized in that: It also has a steam turbine, condenser, condensate pump, low-pressure heater, deaerator, feed water pump, and high-pressure heater; The steam turbine is provided with a steam turbine steam inlet, a steam turbine steam outlet, a steam turbine high-pressure extraction steam outlet, and a steam turbine low-pressure extraction steam outlet; The condenser is provided with a condenser steam inlet and a condenser working medium water outlet; The condensate pump is provided with a condensate pump inlet and a condensate pump outlet; The low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet, and a low-pressure heater extraction steam inlet; The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; The water pump is provided with a water pump inlet and a water pump outlet; The high-pressure heater is provided with a high-pressure heater working medium water inlet, a high-pressure heater working medium water outlet, and a high-pressure heater extraction steam inlet; The boiler is also provided with a boiler working medium water inlet and a boiler steam outlet; The boiler steam outlet is communicated with the turbine steam inlet; the turbine steam outlet is communicated with the condenser steam inlet; the condenser working fluid water outlet is communicated with the condensate pump inlet; the condensate pump outlet is communicated with the low-pressure heater working fluid water inlet; the low-pressure heater working fluid water outlet is communicated with the deaerator working fluid water inlet; the deaerator working fluid water outlet is communicated with the feed water pump inlet; the feed water pump outlet is communicated with the high-pressure heater working fluid water inlet; the high-pressure heater working fluid water outlet is communicated with the boiler working fluid water inlet; the low-pressure heater extraction steam inlet is communicated with the turbine low-pressure extraction steam outlet; the high-pressure heater extraction steam inlet is communicated with the turbine high-pressure extraction steam outlet; The bypass economizer working medium water outlet is connected to the boiler working medium water inlet; the bypass economizer working medium water inlet is connected to the condensate pump outlet; or the bypass economizer working medium water inlet is connected to the feed water pump outlet.

38. The boiler flue gas waste heat recovery and utilization system according to claim 33, characterized in that: It also has a steam turbine, condenser, condensate pump, low-pressure heater, deaerator, feed water pump, and high-pressure heater; The steam turbine is provided with a steam turbine steam inlet, a steam turbine steam outlet, a steam turbine high-pressure extraction steam outlet, and a steam turbine low-pressure extraction steam outlet; The condenser is provided with a condenser steam inlet and a condenser working medium water outlet; The condensate pump is provided with a condensate pump inlet and a condensate pump outlet; The low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet, and a low-pressure heater extraction steam inlet; The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; The water pump is provided with a water pump inlet and a water pump outlet; The high-pressure heater is provided with a high-pressure heater working medium water inlet, a high-pressure heater working medium water outlet, and a high-pressure heater extraction steam inlet; The boiler is also provided with a boiler working medium water inlet and a boiler steam outlet; The boiler steam outlet is communicated with the turbine steam inlet; the turbine steam outlet is communicated with the condenser steam inlet; the condenser working fluid water outlet is communicated with the condensate pump inlet; the condensate pump outlet is communicated with the low-pressure heater working fluid water inlet; the low-pressure heater working fluid water outlet is communicated with the deaerator working fluid water inlet; the deaerator working fluid water outlet is communicated with the feed water pump inlet; the feed water pump outlet is communicated with the high-pressure heater working fluid water inlet; the high-pressure heater working fluid water outlet is communicated with the boiler working fluid water inlet; the low-pressure heater extraction steam inlet is communicated with the turbine low-pressure extraction steam outlet; the high-pressure heater extraction steam inlet is communicated with the turbine high-pressure extraction steam outlet; The bypass economizer working medium water outlet is connected to the boiler working medium water inlet; the bypass economizer working medium water inlet is connected to the condensate pump outlet; or the bypass economizer working medium water inlet is connected to the feed water pump outlet.

39. The boiler flue gas waste heat recovery and utilization system according to claim 35, characterized in that: It also has a steam turbine, condenser, condensate pump, low-pressure heater, deaerator, feed water pump, and high-pressure heater; The steam turbine is provided with a steam turbine steam inlet, a steam turbine steam outlet, a steam turbine high-pressure extraction steam outlet, and a steam turbine low-pressure extraction steam outlet; The condenser is provided with a condenser steam inlet and a condenser working medium water outlet; The condensate pump is provided with a condensate pump inlet and a condensate pump outlet; The low-pressure heater is provided with a low-pressure heater working medium water inlet, a low-pressure heater working medium water outlet, and a low-pressure heater extraction steam inlet; The deaerator is provided with a deaerator working medium water inlet and a deaerator working medium water outlet; The water pump is provided with a water pump inlet and a water pump outlet; The high-pressure heater is provided with a high-pressure heater working medium water inlet, a high-pressure heater working medium water outlet, and a high-pressure heater extraction steam inlet; The boiler is also provided with a boiler working medium water inlet and a boiler steam outlet; The boiler steam outlet is communicated with the turbine steam inlet; the turbine steam outlet is communicated with the condenser steam inlet; the condenser working fluid water outlet is communicated with the condensate pump inlet; the condensate pump outlet is communicated with the low-pressure heater working fluid water inlet; the low-pressure heater working fluid water outlet is communicated with the deaerator working fluid water inlet; the deaerator working fluid water outlet is communicated with the feed water pump inlet; the feed water pump outlet is communicated with the high-pressure heater working fluid water inlet; the high-pressure heater working fluid water outlet is communicated with the boiler working fluid water inlet; the low-pressure heater extraction steam inlet is communicated with the turbine low-pressure extraction steam outlet; the high-pressure heater extraction steam inlet is communicated with the turbine high-pressure extraction steam outlet; The bypass economizer working medium water outlet is connected to the boiler working medium water inlet; the bypass economizer working medium water inlet is connected to the condensate pump outlet; or the bypass economizer working medium water inlet is connected to the feed water pump outlet.

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