Flue gas purification and waste heat recovery system and waste heat recovery device

Abstract

The utility model discloses a flue gas purification and waste heat utilization system and a waste heat recovery device. The flue gas purification and waste heat utilization system comprises a first waste heat boiler unit, a flue gas filtering dust remover unit, an SCR (Selective Catalytic Reduction) denitration reactor unit and a second waste heat boiler unit, wherein a steam outlet of a steam pocket corresponding to the first waste heat boiler unit is connected with a steam inlet of a superheater in the first waste heat boiler unit through a first steam conveying pipe; a steam outlet of the steam pocket corresponding to the second waste heat boiler unit is connected to a steam inlet of the superheater in the first waste heat boiler unit through a second steam conveying pipe; the second steam conveying pipe is provided with a steam flow direction control device used for preventing steam generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit. The dry burning of a superheater in the first waste heat boiler unit due to the fact that the first waste heat boiler unit firstly generates saturated steam and the saturated steam flows to the second waste heat boiler unit through the second steam conveying pipe at the initial stage of system operation is avoided.

Description

TECHNICAL FIELD

[0001] The utility model relates to industrial kiln flue gas treatment technical field, concretely relates to flue gas purification and waste heat recovery system and waste heat recovery device. BACKGROUND

[0002] The applicant provides an industrial silicon smelting flue gas treatment system in the patent document with publication number CN114887409A, which first adjusts the industrial silicon smelting furnace smelting flue gas discharged by the industrial silicon smelting furnace at a temperature of 450-650 DEG C to first cooled flue gas at a temperature of 300-450 DEG C through a first waste heat boiler unit, then adjusts the first cooled flue gas to dust-removed flue gas after filtering and dust-removing purification of the first cooled flue gas through a flue gas filtering dust remover unit, adjusts the dust-removed flue gas to the dust-removed flue gas through an SCR denitration reactor unit, adjusts the dust-removed flue gas to second cooled flue gas at a temperature of 100-200 DEG C through a second waste heat boiler unit, and finally enters a desulfurization device for desulfurization.

[0003] Further, the patent document further discloses: (1) an integrated heat exchange equipment and dust removal and denitration integrated equipment in an industrial silicon smelting flue gas treatment system. Specifically, the shell constituting the flue of the first waste heat boiler unit and the shell constituting the flue of the second waste heat boiler unit are assembled with each other so that the first waste heat boiler unit and the second waste heat boiler unit become an integrated heat exchange equipment; the SCR denitration reactor unit is assembled on the flue gas filtration dust remover unit to form a dust removal and denitration integrated equipment; the integrated heat exchange equipment is peripherally distributed with a gas feeding flue and a backflow flue, the flue gas filtration dust remover unit and the SCR denitration reactor unit are arranged on the side of the integrated heat exchange equipment, the integrated heat exchange equipment connects the exhaust port of the flue of the first waste heat boiler unit with the gas inlet of the flue gas filtration dust remover unit through the gas feeding flue, and the integrated heat exchange equipment connects the gas inlet of the flue of the second waste heat boiler unit with the exhaust port of the SCR denitration reactor unit through the backflow flue. (2) the specific structure of the integrated heat exchange equipment. Specifically, the flue of the first waste heat boiler unit is vertically arranged, and the gas inlet and the exhaust port of the first waste heat boiler unit are distributed at different positions in the upper part and the lower part of the flue of the first waste heat boiler unit, the lower part of the flue of the first waste heat boiler unit is provided with a dust hopper, and the bottom of the dust hopper is connected with a dust discharging mechanism; the flue of the second waste heat boiler unit is also vertically arranged, and the gas inlet and the exhaust port of the second waste heat boiler unit are distributed at different positions in the upper part and the lower part of the flue of the second waste heat boiler unit; thus, the integrated heat exchange equipment forms a reverse U-shaped structure. In addition, the first waste heat boiler unit comprises a first superheater, a first evaporator and a first economizer which are sequentially arranged along the flue of the first waste heat boiler unit from front to back, the second waste heat boiler unit comprises a second evaporator and a second economizer which are sequentially arranged along the flue of the second waste heat boiler unit from front to back, and the steam outlet of the steam drum (as can be seen from the attached drawings, the steam drum is a steam drum attached to the second waste heat boiler unit, and the first waste heat boiler unit also has a steam drum) corresponding to the second evaporator is connected to the steam inlet of the first superheater through a steam conveying pipeline. The steam generated by the first superheater can be input into a steam generator (turbine) to generate power. Figure 3

[0004] ​The applicant found the following problems in the implementation of the industrial silicon smelting flue gas treatment system in the industrial silicon industrialization project: first, since the first waste heat boiler unit and the second waste heat boiler unit are arranged transversely (in the horizontal direction), this not only causes the horizontal land occupation of the integrated heat exchange device to increase, but most critically causes a horizontal spacing between the gas delivery flue and the return flue. At present, the structure of the dust removal and denitrification integrated device is relatively mature, and the gas inlet (i.e. the gas inlet of the flue gas filtering dust remover unit) and the gas outlet (i.e. the gas outlet of the SCR denitrification reactor unit) of the dust removal and denitrification integrated device are often arranged vertically, that is, in order to adapt to the vertical arrangement of the gas inlet and the gas outlet of the dust removal and denitrification integrated device, a horizontal curved pipe section must be arranged on the gas delivery flue and / or the return flue, thereby causing the flue gas pressure loss to increase, the flue gas to be collected, and the distance between the integrated heat exchange device and the dust removal and denitrification integrated device to be limited, thereby increasing the layout length of the industrial silicon smelting flue gas treatment system. Second, in order to generate more high-quality water vapor for power generation, the steam outlet of the steam drum connected to the second evaporator is connected to the steam inlet of the first superheater through a steam conveying pipeline, so that more high-pressure steam can be generated and the power generation capacity can be improved. However, it is further found that this will cause the following problems: in the initial stage of operation of the industrial silicon smelting flue gas treatment system, the first waste heat boiler unit will first generate saturated steam, and this part of saturated steam will flow to the second evaporator through the aforementioned steam conveying pipe, causing the first superheater to "dry burning", thereby causing a safety hazard. Third, the inventors have found that: the steam drums of the first waste heat boiler unit and the second waste heat boiler unit both bear the function of gas-liquid separation and maintain a stable water level. When the scheme of connecting the steam outlet of the steam drum connected to the second evaporator to the steam inlet of the first superheater through a steam conveying pipeline is adopted, only one kind of high-pressure steam is generated at the end. At this time, the independent design of the steam drums of the first waste heat boiler unit and the second waste heat boiler unit is actually redundant, which not only causes the control and pipeline arrangement to be complicated, but also increases the equipment investment and maintenance cost. Fourth, after the high-pressure steam generated by the waste heat boiler drives the steam generator to generate power, the steam is converted into condensed water. The conventional method is to pass the condensed water into the deaerator for deaeration and then return it to the waste heat boiler for recycling. Since the deaerator needs a heat source to heat the condensed water, the conventional scheme is to introduce part of the low-pressure steam from the steam generator as the heat source. However, this method will affect the power generation efficiency. Practical new type content

[0005] The purpose of the present application is to provide an improved industrial kiln flue gas purification and waste heat utilization system and a waste heat recovery device to solve the problems mentioned in the background art.

[0006] In a first aspect, a flue gas purification and waste heat recovery system is provided, comprising: a first waste heat boiler unit configured to obtain industrial kiln flue gas and output first cooled flue gas after first waste heat recovery; a flue gas filter and dust remover unit configured to obtain the first cooled flue gas and output first dedusted flue gas after physically intercepting dust in the first cooled flue gas by a filter core; an SCR denitration reactor unit configured to obtain the first dedusted flue gas added with an SCR denitration reducing agent and output denitration flue gas after passing through an SCR denitration catalyst; and a second waste heat boiler unit configured to obtain the denitration flue gas and output second cooled flue gas after second waste heat recovery. The first waste heat boiler unit and the second waste heat boiler unit are combined together to form an integrated heat exchange device, which has a first cooled flue gas exhaust port, a denitration flue gas inlet port and a second cooled flue gas exhaust port in a first direction. The SCR denitration reactor unit is assembled on the flue gas filter and dust remover unit to form a dedusting and denitration integrated device, which has a first cooled flue gas inlet port and a denitration flue gas exhaust port in a second direction. The integrated heat exchange device and the dedusting and denitration integrated device are oppositely arranged, the first direction and the second direction are opposite directions, a first cooled flue gas conveying channel is connected between the first cooled flue gas exhaust port and the first cooled flue gas inlet port, a denitration flue gas return channel is connected between the denitration flue gas inlet port and the denitration flue gas exhaust port, and a second cooled flue gas conveying channel is circumscribed by the second cooled flue gas exhaust port. The first waste heat boiler unit and the second waste heat boiler unit are arranged in a vertically overlapping manner, and the first cooled flue gas conveying channel, the denitration flue gas return channel and the second cooled flue gas conveying channel each have a horizontal flue, which are arranged in a vertical direction.

[0007] In a second aspect, a waste heat recovery device is provided, comprising: a first waste heat boiler unit configured to obtain industrial kiln flue gas and output first cooled flue gas after first waste heat recovery; and a second waste heat boiler unit configured to obtain the treated flue gas and output second cooled flue gas after second waste heat recovery, the treated flue gas being formed by treating the first cooled flue gas. The first waste heat boiler unit and the second waste heat boiler unit are combined together to form an integrated heat exchange device. The first waste heat boiler unit and the second waste heat boiler unit are arranged in a vertically overlapping manner.

[0008] The first waste heat boiler unit and the second waste heat boiler unit are arranged in an overlapping manner, which not only helps to reduce the land occupation of the flue gas purification and waste heat recovery system, but also helps to reduce the horizontal bending pipe sections in the first cooled flue gas conveying passage, the denitration flue gas backflow passage and the second cooled flue gas conveying passage to improve the flue gas pressure loss and the ash collection problem, and meanwhile, the arrangement can better match the inlet and outlet layout features of the integrated dust removal and denitration equipment, so that the flue arrangement is more simple and reasonable.

[0009] In a third aspect, a flue gas purification and waste heat recovery system is provided, which comprises: a first waste heat boiler unit configured to obtain industrial kiln flue gas and output first cooled flue gas after first waste heat recovery; a flue gas filter dust remover unit configured to obtain the first cooled flue gas and output first dust-removed flue gas after physically intercepting dust in the first cooled flue gas by a filter core; an SCR denitration reactor unit configured to obtain the first dust-removed flue gas added with an SCR denitration reducing agent and output denitration flue gas after passing through an SCR denitration catalyst; and a second waste heat boiler unit configured to obtain the denitration flue gas and output second cooled flue gas after second waste heat recovery; wherein the first waste heat boiler unit and the second waste heat boiler unit are combined together to form an integrated heat exchange equipment; and wherein a drum of the first waste heat boiler unit and a drum of the second waste heat boiler unit share the same drum, and a water vapor outlet of the drum is connected to a water vapor inlet of a superheater in the first waste heat boiler unit through a first steam conveying pipe.

[0010] In a fourth aspect, a waste heat recovery device is provided, which comprises: a first waste heat boiler unit configured to obtain industrial kiln flue gas and output first cooled flue gas after first waste heat recovery; and a second waste heat boiler unit configured to obtain treated flue gas formed by treating the first cooled flue gas and output second cooled flue gas after second waste heat recovery; wherein the first waste heat boiler unit and the second waste heat boiler unit are combined together to form an integrated heat exchange equipment; and wherein a drum of the first waste heat boiler unit and a drum of the second waste heat boiler unit share the same drum, and a water vapor outlet of the drum is connected to a water vapor inlet of a superheater in the first waste heat boiler unit through a first steam conveying pipe.

[0011] The design that the first waste heat boiler unit and the second waste heat boiler unit share the same drum can realize stable system operation through unified water level and pressure control, which not only simplifies the system structure and control logic, reduces the equipment investment and maintenance cost, but also makes the whole system operation more reliable and efficient.

[0012] In a fifth aspect, a flue gas purification and waste heat recovery system is provided, comprising: a first waste heat boiler unit configured to obtain flue gas of an industrial kiln and output first cooled flue gas after first waste heat recovery; a flue gas filter and dust remover unit configured to obtain the first cooled flue gas and output first dust-removed flue gas after physically intercepting dust in the first cooled flue gas by a filter core; an SCR denitration reactor unit configured to obtain the first dust-removed flue gas added with an SCR denitration reducing agent and output denitration flue gas after passing through an SCR denitration catalyst; and a second waste heat boiler unit configured to obtain the denitration flue gas and output second cooled flue gas after second waste heat recovery. The water vapor outlet of a corresponding steam drum of the first waste heat boiler unit is connected to the water vapor inlet of a superheater in the first waste heat boiler unit through a first steam delivery pipe, and the water vapor outlet of a corresponding steam drum of the second waste heat boiler unit is connected to the water vapor inlet of the superheater in the first waste heat boiler unit through a second steam delivery pipe. The second steam delivery pipe is provided with a water vapor flow direction control device for preventing water vapor generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit.

[0013] In a sixth aspect, a waste heat recovery device is provided, comprising: a first waste heat boiler unit configured to obtain flue gas of an industrial kiln and output first cooled flue gas after first waste heat recovery; and a second waste heat boiler unit configured to obtain treated flue gas formed by treating the first cooled flue gas and output second cooled flue gas after second waste heat recovery. The water vapor outlet of a corresponding steam drum of the first waste heat boiler unit is connected to the water vapor inlet of a superheater in the first waste heat boiler unit through a first steam delivery pipe, and the water vapor outlet of a corresponding steam drum of the second waste heat boiler unit is connected to the water vapor inlet of the superheater in the first waste heat boiler unit through a second steam delivery pipe. The second steam delivery pipe is provided with a water vapor flow direction control device for preventing water vapor generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit.

[0014] The water vapor flow direction control device provided on the second steam delivery pipe can prevent water vapor generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit, thereby avoiding the situation that the superheater in the first waste heat boiler unit is “dry-burned” due to the flow of saturated steam from the first waste heat boiler unit to the second waste heat boiler unit through the second steam delivery pipe at the initial stage of system operation.

[0015] In a seventh aspect, a flue gas purification and waste heat recovery system is provided, comprising: a first waste heat boiler unit configured to obtain flue gas of an industrial kiln and output first cooled flue gas after first waste heat recovery; a flue gas filter and dust remover unit configured to obtain the first cooled flue gas and output first dedusted flue gas after physically intercepting dust in the first cooled flue gas by a filter core; an SCR denitration reactor unit configured to obtain the first dedusted flue gas added with an SCR denitration reducing agent and output denitration flue gas after passing through an SCR denitration catalyst; and a second waste heat boiler unit configured to obtain the denitration flue gas and output second cooled flue gas after second waste heat recovery. At least water vapor generated by the first waste heat boiler unit is made to work by a steam turbine to become condensed water, and the condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit. In addition, the system further comprises a condensed water heater configured to obtain the second cooled flue gas and heat the condensed water by using the second cooled flue gas to become heated condensed water, and the heated condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit.

[0016] In an eighth aspect, a waste heat recovery device is provided, comprising: a first waste heat boiler unit configured to obtain flue gas of an industrial kiln and output first cooled flue gas after first waste heat recovery; and a second waste heat boiler unit configured to obtain treated flue gas formed by treating the first cooled flue gas and output second cooled flue gas after second waste heat recovery. At least water vapor generated by the first waste heat boiler unit is made to work by a steam turbine to become condensed water, and the condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit. A condensed water heater is further arranged in a tail section of a flue of the second waste heat boiler unit, and the condensed water heater is configured to obtain the second cooled flue gas and heat the condensed water by using the second cooled flue gas to become heated condensed water, and the heated condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit.

[0017] By additionally arranging the condensed water heater, the second cooled flue gas is used to preheat the condensed water, which not only realizes further recovery and utilization of waste heat of the second cooled flue gas, but also increases the temperature of the heated condensed water entering the deaerator, so that independent heating of the deaerator can be reduced or even cancelled, and the influence of the deaerator on power generation efficiency caused by using part of low-pressure steam from the steam turbine as a heat source to heat the deaerator can be reduced.

[0018] The utility model will be further explained in connection with the drawings and specific embodiments. The additional aspects and advantages of the utility model will be partially given in the following description, some will become apparent from the following description, or be known by practice. BRIEF DESCRIPTION OF DRAWINGS

[0019] The drawings constituting a part of this specification are used to assist in the understanding of the utility model, the content provided in the drawings and its relevant explanation in the specification can be used to explain the utility model, but do not constitute improper limitation to the utility model.

[0020] Figure 1 It is a structure schematic diagram of the flue gas purification and waste heat recovery system of the utility model embodiment.

[0021] Figure 2 It is Figure 1 The side view of the integrated heat exchange equipment appearing in the middle.

[0022] Figure 3 It is a schematic diagram of the waste heat recovery device of the utility model embodiment.

[0023] Figure 4 It is a schematic diagram of the waste heat recovery device of the utility model embodiment. DETAILED DESCRIPTION

[0024] The utility model will be further explained in connection with the drawings and specific embodiments. The additional aspects and advantages of the utility model will be partially given in the following description, some will become apparent from the following description, or be known by practice.

[0025] The technical solutions and technical features provided in each part including the following description can be combined with each other in the case of no conflict. In addition, in the case of possibility, these technical solutions, technical features and relevant combinations can be given specific technical subjects and be protected by relevant patents.

[0026] The embodiments of the utility model involved in the following description are usually only part of the embodiments but not all the embodiments, based on these embodiments, all other embodiments obtained by the ordinary skill in the art without creative labor should belong to the scope of patent protection.

[0027] Regarding the terms and units in the specification: the terms "include", "contain", "have" and any variants thereof in the specification and the corresponding claims and relevant parts are intended to cover non-exclusive inclusion. In addition, other relevant terms and units can be reasonably explained based on the relevant content provided in the specification.

[0028] Figure 1 This is a schematic diagram of the structure of a flue gas purification and waste heat recovery system according to an embodiment of the present invention. Figure 2 for Figure 1 A side view of the integrated heat exchanger that appears in the image. Figure 4 This is a schematic diagram of a waste heat recovery device according to an embodiment of the present utility model. Figure 1 The flue gas purification and waste heat recovery system shown adopts Figure 4 Waste heat recovery device in the middle.

[0029] like Figures 1-2 as well as Figure 4 As shown, an embodiment of the present invention provides a flue gas purification and waste heat recovery system, comprising: a first waste heat boiler unit 11, used to acquire industrial kiln flue gas (specifically, high-temperature flue gas emitted from an industrial silicon smelting furnace) and perform first waste heat recovery before outputting first cooled flue gas; a flue gas filter dust collector unit 21, used to acquire the first cooled flue gas and physically intercept dust in the first cooled flue gas through a filter element before outputting first dust-removed flue gas; an SCR denitrification reactor unit 22, used to acquire the first dust-removed flue gas with added SCR denitrification reducing agent and output denitrified flue gas after passing through an SCR denitrification catalyst; and a second waste heat boiler unit 12, used to acquire the denitrified flue gas and perform second waste heat recovery before outputting second cooled flue gas.

[0030] The first waste heat boiler unit 11 and the second waste heat boiler unit 12 are combined together to form an integrated heat exchange device 1 (i.e., a waste heat recovery device). The integrated heat exchange device 1 has a first cooled flue gas exhaust port, a denitrified flue gas inlet, and a second cooled flue gas exhaust port located in a first direction.

[0031] The SCR denitrification reactor unit 22 is assembled on the flue gas filter dust collector unit 21 to form an integrated dust removal and denitrification device 2. The integrated dust removal and denitrification device 2 has a first cooled flue gas inlet and a denitrified flue gas exhaust outlet located in the second direction.

[0032] The integrated heat exchanger 1 and the integrated dust removal and denitrification equipment 2 are arranged opposite each other, with the first direction and the second direction being opposite directions. The first cooled flue gas exhaust port and the first cooled flue gas inlet are connected to a first cooled flue gas supply channel 31, and the denitrified flue gas inlet and the denitrified flue gas exhaust port are connected to a denitrified flue gas return channel 32. The second cooled flue gas exhaust port is externally connected to a second cooled flue gas supply channel 33. The second cooled flue gas supply channel 33 can be connected to the desulfurization unit.

[0033] And, the first heat recovery boiler unit 11 and the second heat recovery boiler unit 12 are arranged in an up-down overlapping manner, the first cooled flue gas feeding passage 31, the denitration flue gas reflux passage 32 and the second cooled flue gas feeding passage 33 each have a lateral flue (i.e. a horizontal flue), and these lateral flues are arranged in a vertical direction with intervals.

[0034] Specifically, the first heat recovery boiler unit 11 is located above the second heat recovery boiler unit 12, the first cooled flue gas exhaust port is located above the denitration flue gas inlet port, the second cooled flue gas exhaust port is located below the denitration flue gas inlet port, and the denitration flue gas inlet port and the denitration flue gas exhaust port are flush with each other in height; in addition, the lateral flue of the first cooled flue gas feeding passage 31 is connected to the first cooled flue gas exhaust port through a longitudinally offset flue 34 located beside the denitration flue gas inlet port (the longitudinally offset flue 34 bypasses the denitration flue gas reflux passage 32), the lateral flue of the denitration flue gas reflux passage 32 (the denitration flue gas reflux passage 32 as a whole is a lateral flue) is directly aligned with the denitration flue gas inlet port, and the lateral flue of the second cooled flue gas feeding passage 33 is directly aligned with the second cooled flue gas exhaust port.

[0035] The first heat recovery boiler unit 11 and the second heat recovery boiler unit 12 are arranged in an up-down overlapping manner, which not only helps to reduce the floor area of the flue gas purification and waste heat recovery system, but also helps to reduce the horizontal curved pipe sections in the first cooled flue gas feeding passage 31, the denitration flue gas reflux passage 32 and the second cooled flue gas feeding passage 33 to improve the flue gas pressure loss and the ash collection problem, and at the same time, this arrangement can better match the inlet and outlet layout features of the dust and denitration integrated device 2, so that the flue arrangement is more simple and reasonable. The distance between the integrated heat exchange device 1 and the dust and denitration integrated device 2 is very short, which can greatly save the floor length of the flue gas purification and waste heat recovery system.

[0036] As a specific embodiment of the structure of the above-mentioned dust and denitration integrated device 2, the dust and denitration integrated device comprises:

[0037] A) a first box body, the first box body has the following compartments formed by a first box body internal partition system:

[0038] A1) a left side dust collector total cabin, the left side dust collector total cabin has one or more left side dust collector compartments arranged in sequence in the front-rear direction, each left side dust collector compartment has a left side dust collector lower raw gas cabin and a left side dust collector upper clean gas cabin, a filter element mounting plate is arranged between the left side dust collector lower raw gas cabin and the left side dust collector upper clean gas cabin, and a filter element extending downward into the left side dust collector lower raw gas cabin is mounted on the filter element mounting plate;

[0039] A2) right side dust collector total cabin, the right side dust collector total cabin has one or more right side dust collector compartments arranged in sequence along the front-rear direction, each right side dust collector compartment has a right side dust collector lower raw gas cabin and a right side dust collector upper clean gas cabin, a filter element mounting plate is arranged between the right side dust collector lower raw gas cabin and the right side dust collector upper clean gas cabin, and a filter element extending downward into the left side dust collector lower raw gas cabin is mounted on the filter element mounting plate;

[0040] A3) intermediate flue total cabin, the intermediate flue total cabin is located between the left side dust collector total cabin and the right side dust collector total cabin and has a lower gas inlet flue cabin and an upper gas outlet flue cabin, the lower gas inlet flue cabin extends along the front-rear direction and is in communication with each left side dust collector lower raw gas cabin and each right side dust collector lower raw gas cabin, respectively, and the upper gas outlet flue cabin extends along the front-rear direction;

[0041] B) second box, the second box is arranged on the top of the first box and a passage is reserved on the top surface of the first box at the periphery of the second box, and the second box has the following compartments separated by a second box internal partition system:

[0042] B1) left side gas collection cabin, the lower part of the left side gas collection cabin is arranged above the left side dust collector total cabin and is in communication with each left side dust collector upper clean gas cabin, and a left side gas collection cabin upper gas outlet is arranged on the upper right side partition of the left side gas collection cabin;

[0043] B2) right side gas collection cabin, the lower part of the right side gas collection cabin is arranged above the right side dust collector total cabin and is in communication with each right side dust collector upper clean gas cabin, and a right side gas collection cabin upper gas outlet is arranged on the upper left side partition of the right side gas collection cabin;

[0044] B3) intermediate SCR denitration reaction cabin, the intermediate SCR denitration reaction cabin is located between the left side gas collection cabin and the right side gas collection cabin, the upper part of the intermediate SCR denitration reaction cabin is in communication with the left side gas collection cabin upper gas outlet and the right side gas collection cabin upper gas outlet, respectively, the lower part of the intermediate SCR denitration reaction cabin is arranged above the intermediate flue total cabin and is in communication with the upper gas outlet flue cabin, and an SCR denitration catalyst bed is arranged in the intermediate SCR denitration reaction cabin;

[0045] Wherein, the total gas inlet of the lower gas inlet flue cabin and the total gas outlet of the upper gas outlet flue cabin are arranged on the same side of the first box in the front-rear direction and face the second direction.

[0046] The above-mentioned dust removal and denitration integrated equipment 2 has the appearance characteristics of a large box (first box) and a small box (second box) combined and the small box located at the top of the large box. The internal structure of the large box is relatively common, and the internal structure of the small box and the connection relationship between the small box and the large box are the key innovative points of the dust removal and denitration integrated equipment. The left and right gas collection cabins of the small box introduce the gas flow in the upper clean gas cabin of each left dust remover and the upper clean gas cabin of each right dust remover into the small box from bottom to top, and then the gas flow passes through the middle SCR denitration reaction cabin from top to bottom. The gas flow discharged from the middle SCR denitration reaction cabin continues to flow downward into the upper exhaust flue cabin, so that the dust removal and denitration integrated equipment 2 is discharged through the upper exhaust flue cabin. The above-mentioned dust removal and denitration integrated equipment 2 directly uses the upper exhaust flue cabin in the large box to realize exhaust, and a simple improvement is made on the basis of the existing dust remover structure to realize the dust removal and denitration integrated scheme. In addition to the advantages of simple structure and saving construction cost, the above-mentioned dust removal and denitration integrated equipment 2 also has the advantages of convenient loading and unloading of SCR denitration catalyst and saving floor area.

[0047] As another specific embodiment of the structure of the above-mentioned dust removal and denitration integrated equipment 2 (which has been disclosed in the patent document with publication number CN118391924A), the dust removal and denitration integrated equipment comprises:

[0048] A) a first box, which has the following separate cabins formed by a first box internal partition system inside the first box:

[0049] A1) a left dust remover total cabin body, which has one or more left dust remover separate cabins arranged in sequence along the front-rear direction, each left dust remover separate cabin having a left dust remover lower original gas cabin and a left dust remover upper clean gas cabin, a filter element mounting plate being arranged between the left dust remover lower original gas cabin and the left dust remover upper clean gas cabin, and a filter element extending downward into the left dust remover lower original gas cabin being mounted on the filter element mounting plate;

[0050] A2) a right dust remover total cabin body, which has one or more right dust remover separate cabins arranged in sequence along the front-rear direction, each right dust remover separate cabin having a right dust remover lower original gas cabin and a right dust remover upper clean gas cabin, a filter element mounting plate being arranged between the right dust remover lower original gas cabin and the right dust remover upper clean gas cabin, and a filter element extending downward into the left dust remover lower original gas cabin being mounted on the filter element mounting plate;

[0051] A3) an intermediate flue main cabin body, which is located between the left side dust collector main cabin body and the right side dust collector main cabin body and has a lower inlet flue cabin and an upper clean gas conveying cabin, the lower inlet flue cabin extends in the front-rear direction and is respectively communicated with each left side dust collector lower raw gas cabin and each right side dust collector lower raw gas cabin, the upper clean gas conveying cabin is located above the lower inlet flue cabin, extends in the front-rear direction and is respectively communicated with each left side dust collector upper clean gas cabin and each right side dust collector upper clean gas cabin, the intermediate flue main cabin body further has a middle exhaust flue cabin located between the lower inlet flue cabin and the upper clean gas conveying cabin, the middle exhaust flue cabin extends in the front-rear direction, the rear side SCR denitration reaction cabin lower exhaust port is communicated with the rear end of the middle exhaust flue cabin, and the total inlet port of the lower inlet flue cabin and the total exhaust port of the middle exhaust flue cabin are arranged on the same side of the first box body;

[0052] B) a second box body, which is arranged at the rear of the first box body, and has the following cabin bodies separated by a second box body internal partition system inside the second box body:

[0053] B1) a front side gas collection cabin, a lower part of the front side gas collection cabin is arranged at the rear of the upper clean gas conveying cabin and is communicated with the upper clean gas conveying cabin, and an upper part of the front side gas collection cabin is provided with a front side gas collection cabin upper exhaust port;

[0054] B2) a rear side SCR denitration reaction cabin, which is arranged at the rear of the front side gas collection cabin, an upper part of the rear side SCR denitration reaction cabin is communicated with the front side gas collection cabin upper exhaust port, a lower part of the rear side SCR denitration reaction cabin is provided with a rear side SCR denitration reaction cabin lower exhaust port, and an SCR denitration catalyst bed is arranged in the rear side SCR denitration reaction cabin;

[0055] The total inlet port of the lower inlet flue cabin and the total exhaust port of the middle exhaust flue cabin are arranged on the same side of the first box body and face the second direction.

[0056] The dust and denitration integrated equipment 2 has the characteristics of a large box body (first box body) and a small box body (second box body) combination and the small box body located at the rear of the large box body, and the connection relationship of the upper clean gas conveying cabin of the large box body and the small box body is the key innovation point of the dust and denitration integrated equipment. Since the small box body is located at the rear of the large box body, the large box body does not need to bear the weight of the small box body. The large box body guides the gas flow into the small box body through the upper clean gas conveying cabin, and simply realizes the communication of the large box body and the small box body. The dust and denitration integrated equipment has the advantages of simple structure and can save construction cost.

[0057] It should be noted that the specific embodiments of the above two dust removal and denitration integrated equipment have been disclosed and explained in the patent document with application number 2024215950909 of the applicant's prior application. If the specific embodiments of the above two dust removal and denitration integrated equipment are not clear, reference can be made to the prior application.

[0058] Among them, the bottom of each left side dust remover lower original gas cabin and the bottom of each right side dust remover lower original gas cabin are provided with ash hoppers, and each ash hopper bottom is provided with an ash unloading device.

[0059] Among them, the transverse flue of the second cooled flue gas gas supply channel 33 is arranged between one row of ash hoppers formed by the bottom ash hoppers of each left side dust remover lower original gas cabin and another row of ash hoppers formed by the bottom ash hoppers of each right side dust remover lower original gas cabin.

[0060] In addition, a flue support 4 is provided between the integrated heat exchange equipment 1 and the dust removal and denitration integrated equipment 2, and the transverse flue of the first cooled flue gas gas supply channel, the transverse flue of the denitration flue gas return channel and the transverse flue of the second cooled flue gas gas supply channel are respectively erected on the support platforms at different elevations of the flue support 4.

[0061] As shown in Figures 1-2 and Figure 4 , in the waste heat recovery device here, the drum 111 of the first waste heat boiler unit 11 shares the same drum 111 with the drum of the second waste heat boiler unit 12, and the steam outlet of the drum 111 is connected to the steam inlet of the superheater 113 in the first waste heat boiler unit 11 through the first steam conveying pipe 112.

[0062] In the past, the drum 111 of the first waste heat boiler unit 11 and the drum of the second waste heat boiler unit 12 are independent (see Figure 3 ). The inventors found that the drums of the first waste heat boiler unit and the second waste heat boiler unit both bear the function of gas-liquid separation and maintain a stable water level. When the scheme of connecting the steam outlet of the drum corresponding to the second evaporator to the steam inlet of the first superheater through the steam conveying pipeline is adopted, only one kind of high-pressure steam is produced at the end. At this time, the independent design of the drum of the first waste heat boiler unit and the drum of the second waste heat boiler unit actually exists redundancy, which not only leads to the complexity of control and pipeline arrangement, but also increases the equipment investment and maintenance cost. Figure 4 In the present application, since the first waste heat boiler unit and the second waste heat boiler unit share the same drum, stable system operation can be achieved through unified water level and pressure control, the system structure and control logic are simplified, the equipment investment and maintenance cost are reduced, and the whole system operation is more reliable and efficient.

[0063] In addition, as shown inFigure 4 As shown, a one-way valve 122 is arranged on the riser pipe of the evaporator 121 in the second heat recovery boiler unit 12 to prevent the water vapor in the steam drum 111 from flowing to the second heat recovery boiler unit 12 through the riser pipe. This can prevent the saturated steam in the steam drum 111 from flowing to the second heat recovery boiler unit at the initial stage of system operation, causing the superheater 113 in the first heat recovery boiler unit to "dry out".

[0064] The water vapor generated by the first heat recovery boiler unit 11 and the second heat recovery boiler unit 12 is all used to do work in the steam turbine 5 and becomes condensed water. The condensed water needs to be deaerated in the deaerator 6 before being returned to the first heat recovery boiler unit and the second heat recovery boiler unit.

[0065] As shown in the figure, Figure 4 In the heat recovery device, the hot surface (i.e. the heating surface) of the first heat recovery boiler unit 11 is composed of the superheater 113 and the evaporator 114 arranged in sequence along the direction of flue gas flow. The hot surface of the second heat recovery boiler unit 12 is composed of the evaporator 121, the economizer 123 and the condensed water heater 124 arranged in sequence along the direction of flue gas flow.

[0066] The condensed water heater 124 is used to obtain the second cooled flue gas and heat the condensed water to become heated condensed water using the second cooled flue gas. The heated condensed water is deaerated in the deaerator 6 before being returned to the first heat recovery boiler unit and the second heat recovery boiler unit.

[0067] In the past, after the high-pressure steam generated by the heat recovery boiler drives the steam turbine to generate electricity, the steam is converted into condensed water. The conventional method is to pass the condensed water into the deaerator for deaeration before returning it to the heat recovery boiler for recycling. Since the deaerator needs a heat source to heat the condensed water, the conventional solution is to draw part of the low-pressure steam from the steam turbine as the heat source. However, this method will affect the power generation efficiency. Here, by adding the condensed water heater 124, the second cooled flue gas is used to preheat the condensed water. This not only realizes the further recovery and utilization of the waste heat of the second cooled flue gas, but also increases the temperature of the heated condensed water entering the deaerator 6, which can reduce or even eliminate the independent heating of the deaerator, thereby reducing the impact of the deaerator being heated by part of the low-pressure steam drawn from the steam turbine on the power generation efficiency. Here, the condensed water heater 124 is arranged in the last section of the flue of the second heat recovery boiler unit and becomes part of the hot surface of the second heat recovery boiler unit, which is the most ideal installation position of the condensed water heater 124.

[0068] As shown in the figure, Figure 4 A condensed water storage device 7 is arranged between the steam turbine 5 and the condensed water heater 124 to better supply condensed water to the condensed water heater 124.

[0069] Figure 3 A schematic view of a waste heat recovery device according to an embodiment of the present application. Figure 1 The flue gas purification and waste heat recovery system shown can also adopt Figure 3 the waste heat recovery device in the above.

[0070] As Figure 3 shown, the water vapor outlet of the steam drum 111 corresponding to the first waste heat boiler unit 11 is connected to the water vapor inlet of the superheater 113 in the first waste heat boiler unit 11 through the first steam conveying pipe 112, and the water vapor outlet of the steam drum 125 corresponding to the second waste heat boiler unit 12 is connected to the water vapor inlet of the superheater 113 in the first waste heat boiler unit 11 through the second steam conveying pipe 125; wherein the second steam conveying pipe 125 is provided with a water vapor flow direction control device for preventing the water vapor generated in the first waste heat boiler unit 11 from flowing to the second waste heat boiler unit 12.

[0071] Specifically, the water vapor flow direction control device adopts a one-way valve 126; the outlet of the second steam conveying pipe 125 is connected to the first steam conveying pipe 112.

[0072] The water vapor flow direction control device provided on the second steam conveying pipe 125 can prevent the water vapor generated in the first waste heat boiler unit 11 from flowing to the second waste heat boiler unit 12, thereby avoiding the "dry burning" of the superheater 113 in the first waste heat boiler unit 11 due to the saturated steam generated in the first waste heat boiler unit 11 flowing to the second waste heat boiler unit 12 through the second steam conveying pipe 125 at the initial stage of system operation.

[0073] As Figure 3 shown, in the waste heat recovery device, the hot surface (i.e. heating surface) of the first waste heat boiler unit 11 is composed of the superheater 113 and the evaporator 114 arranged in sequence along the flue gas flow direction; the hot surface of the second waste heat boiler unit 12 is composed of the evaporator 121, the economizer 123 and the condensate heater 124 arranged in sequence along the flue gas flow direction.

[0074] The condensate heater 124 is used to obtain the second cooled flue gas and heat the condensate output by the steam generator 5 into heated condensate using the second cooled flue gas, and the heated condensate is returned to the first waste heat boiler unit and the second waste heat boiler unit after being deaerated by the deaerator 7.

[0075] By the condensate water heater 124, the second cooled flue gas is used to preheat the condensate water, not only realizes the further recycling of the second cooled flue gas waste heat, improves the heated condensate water temperature entering the deaerator 6, can reduce or even cancel the independent heating of the deaerator, reduces the influence of the part of low pressure steam from the steam generator as a heat source on the deaerator heating on the power generation efficiency.

[0076] The above describes the related content of the present application. The ordinary skilled in the art can realize the present application based on the above description. Based on the above description of the present application, all other embodiments obtained by the ordinary skilled in the art without creative labor shall belong to the scope of patent protection.

Claims

1. A flue gas cleaning and waste heat recovery system, comprising: a first waste heat boiler unit for obtaining industrial kiln flue gas and outputting first cooled flue gas after first waste heat recovery; a flue gas filter dust remover unit for obtaining the first cooled flue gas and outputting first dedusted flue gas after physically intercepting dust in the first cooled flue gas by a filter core; an SCR denitration reactor unit for obtaining the first dedusted flue gas added with an SCR denitration reducing agent and outputting denitration flue gas after passing through an SCR denitration catalyst; a second waste heat boiler unit for obtaining the denitration flue gas and outputting second cooled flue gas after second waste heat recovery; wherein a water vapor outlet of a steam drum corresponding to the first waste heat boiler unit is connected to a water vapor inlet of a superheater in the first waste heat boiler unit through a first steam delivery pipe, and a water vapor outlet of a steam drum corresponding to the second waste heat boiler unit is connected to the water vapor inlet of the superheater in the first waste heat boiler unit through a second steam delivery pipe; characterized in that: a water vapor flow direction control device for preventing water vapor generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit is arranged on the second steam delivery pipe.

2. The flue gas cleaning and heat recovery system according to claim 1, characterized in that: The water vapor flow direction control device is a one-way valve.

3. The flue gas cleaning and heat recovery system according to claim 1, wherein: The outlet of the second steam delivery pipe is connected to the first steam delivery pipe.

4. The flue gas cleaning and heat recovery system according to claim 1, wherein: Water vapor generated in at least the first waste heat boiler unit among the first waste heat boiler unit and the second waste heat boiler unit becomes condensed water after work by a steam turbine, and the condensed water returns to the first waste heat boiler unit and / or the second waste heat boiler unit after deaeration by a deaerator. The system further comprises a condensed water heater for obtaining the second cooled flue gas and heating the condensed water to become heated condensed water using the second cooled flue gas, and the heated condensed water returns to the first waste heat boiler unit and / or the second waste heat boiler unit after deaeration by a deaerator.

5. The flue gas cleaning and heat recovery system according to claim 4, characterized in that: The condensed water heater is arranged in a final section of a flue of the second waste heat boiler unit and becomes part of a hot surface of the second waste heat boiler unit.

6. The flue gas cleaning and heat recovery system according to claim 5, wherein: The hot surface of the second waste heat boiler unit is composed of, in order along a flue gas flow direction, an evaporator, an economizer, and the condensed water heater.

7. The flue gas cleaning and heat recovery system according to claim 1, wherein: The hot surface of the first waste heat boiler unit is composed of, in order along a flue gas flow direction, a superheater and an evaporator.

8. A waste heat recovery device, comprising: a first waste heat boiler unit for obtaining industrial kiln flue gas and outputting first cooled flue gas after first waste heat recovery; a second waste heat boiler unit for obtaining second cooled flue gas after second waste heat recovery, the second cooled flue gas being formed by treating the first cooled flue gas; wherein a water vapor outlet of a steam drum corresponding to the first waste heat boiler unit is connected to a water vapor inlet of a superheater in the first waste heat boiler unit through a first steam delivery pipe, and a water vapor outlet of a steam drum corresponding to the second waste heat boiler unit is connected to the water vapor inlet of the superheater in the first waste heat boiler unit through a second steam delivery pipe; characterized in that: The second steam delivery pipe is provided with a water vapor flow direction control device for preventing water vapor generated in the first waste heat boiler unit from flowing to the second waste heat boiler unit.

9. The heat recovery device according to claim 8, wherein: The water vapor flow direction control device is a one-way valve.

10. The heat recovery apparatus of claim 8, wherein: Water vapor generated in at least the first waste heat boiler unit is used by a steam turbine to do work and becomes condensed water, and the condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit. The second waste heat boiler unit is further provided with a condensed water heater at the end of the flue, which is used to obtain the second cooled flue gas and heat the condensed water into heated condensed water by using the second cooled flue gas, and the heated condensed water is deaerated by a deaerator and returned to the first waste heat boiler unit and / or the second waste heat boiler unit.

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