21results about How to "Increase feed water temperature" patented technology

The utility model discloses a high-parameter thermal power generating unit depressurization blowpipe temporary system, which belongs to the technical field of unit depressurization blowpipes and comprises a primary steam-water system, a secondary steam system, a target plate device and a silencer which are sequentially connected. The primary steam-water system comprises a separator, a superheater and a main steam pipeline which are connected in sequence, the secondary steam system comprises a hot resteam pipeline, a reheater and a cold resteam pipeline which are connected in sequence, the cold resteam pipeline is provided with a main adjacent blowing door, the main steam pipeline is communicated with the cold resteam pipeline through a high-pressure bypass pipeline, and the reheater is communicated with the high-pressure bypass pipeline. And the high-pressure bypass pipeline is provided with a high-pressure bypass adjacent blowing door. The secondary steam system and the high-pressure bypass system both participate in pipe blowing heat storage, the effective time of pipe blowing each time can be prolonged, the pipe blowing frequency is reduced, high efficiency and energy conservation are achieved, and stress damage to a boiler is relieved.

The invention belongs to the field of coal-fired power generation, and particularly relates to a heat supply and power generation system for improving the flexibility of a thermoelectric load by coupling molten salt heat storage and an operation method, the system is additionally provided with a heat supply network heating system on the basis of a conventional coal-fired power generation system, and is coupled with an innovative heat storage system adopting a collaborative heat storage and collaborative heat release structure. When the power supply load of the coupling heat supply power generation system is reduced, reheated steam and redundant electric power which is not connected to the network are used for heating molten salt for collaborative heat storage, meanwhile, reheated cold section extraction steam is used for supplying heat to a heat supply network, the load reduction rate is increased, the downward peak regulation depth of the coupling heat supply power generation system can be effectively reduced, and the power supply efficiency is improved. And zero power output of the power generation system can be realized under the condition that the boiler maintains the lowest operation load. The thermoelectric load characteristic interval range of the coupling heat supply power generation system is remarkably expanded, the variable load rate of the coupling heat supply power generation system is improved, and the heat supply and power supply flexibility of the coupling heat supply power generation system is improved.

The utility model provides a flash steam recycling system, and belongs to the field of flash steam recycling. The system comprises a heat exchanger, a boiler water supply tank, a first flash tank, a second flash tank, a condensate water collecting tank, a heat conduction pipe, a first water pump, a second water pump, a temperature sensor, a liquid level sensor, a steam compressor and a controller. The two flash tanks are arranged to carry out two-time step-by-step flash evaporation to fully recycle and utilize flash steam heat, and the boiler feed water temperature is continuously increased twice through the heat exchanger and the heat conduction pipe, so that the combustion energy consumption is reduced; through recovery of flash steam heat, visual pollution caused by white fog generated by flash steam emission is reduced or avoided, energy emission is reduced, and energy is saved; and steam discharged by the second flash tank is secondarily heated and pressurized through the steam compressor, so that the boiler feed water temperature is further increased.

The present invention relates to a combined steam generating device with a preheating water tank, comprising a softening water processor, a normal pressure heating water system and a steam production system which are sequentially connected in series through pipelines; the steam production system comprises a steam boiler, a variable frequency water supply pump, a check valve and a preheating water inlet pipeline; the normal pressure heating water system comprises a preheating electromagnetic boiler, a preheating water tank, a circulating water pump, an electromagnetic valve and a cold water pipeline; the outlet of the softening water processor is connected to the upper part of the preheating water tank through the cold water pipeline; during operation, incoming water is input into the preheating water tank; at night, the preheating electromagnetic boiler is turned on, and the circulating water pump circulates the water in the preheating water tank into the preheating electromagnetic boiler for heating; during daytime, the burner of the gas steam boiler is turned on, and the flue gas further heats the hot water in the waste heat recovery device, and the hot water enters the gas steam boiler to generate steam.

The utility model discloses a kind of coal-fired power plant boiler systems of promoting deep carbon reduction capacity, by being equipped with hot secondary air warm air heater on secondary air duct, and hot secondary air warm air heater is equipped with extraction steam heating hot secondary air after steam exhaust pipeline;Extraction steam heating hot secondary air after steam exhaust pipeline connects two-stage temperature and pressure reducer, and two-stage temperature and pressure reducer is discharged by the steam exhaust steam turbine two-stage extraction steam pipeline through the steam exhaust steam turbine two-stage extraction steam pipeline adjusting valve of steam turbine two-stage extraction steam pipeline;Main steam output pipeline is connected with one-stage temperature and pressure reducer by being sequentially set extraction steam import shut-off valve, extraction steam import regulating valve extraction steam main pipe in sequence, and one-stage temperature and pressure reducer is equipped with extraction steam pipeline after temperature and pressure reduction;Extraction steam pipeline after temperature and pressure reduction is communicated hot secondary air warm air heater;To solve the problem that boiler stable combustion, feedwater temperature is low, coal mill drying treatment is insufficient when coal-fired power plant boiler exists depth peak shaving, improve the economy of boiler deep regulation condition simultaneously, reduce carbon emission.

The utility model discloses a cement kiln head low-temperature waste heat recycling system which comprises a condenser, and a water outlet of the condenser is connected with a condensate pump. The bottom of the AQC boiler is provided with a flue outlet, the flue outlet is connected with the condensate pump, and the side portion of the AQC boiler is further provided with an economizer. An annular heat exchanger is arranged on the outer side of the kiln body, the heat exchanger is provided with a water inlet and a water outlet, the water inlet of the heat exchanger is connected with the water outlet of the flue outlet, and the water outlet of the heat exchanger is connected with the deaerator. The utility model relates to the technical field of cement waste heat power generation, in particular to a cement kiln head low-temperature waste heat recycling system which can further save energy, reduce waste of heat resources and improve heat energy utilization efficiency through comprehensive utilization of cement kiln head waste gas and cement kiln barrel low-temperature waste heat resources. Recycling of kiln head waste gas waste heat resources and kiln body radiant heat is achieved, further, the recycled heat is directly used for heating condensed water, and the thermal deoxidizing effect is achieved.

The invention discloses a No.0 high-pressure heater system suitable for low-load heat supply of a unit, which comprises a No.0 high-pressure heating steam trap and a No.0 high-pressure heater external steam cooler, and the No.0 high-pressure heater external steam cooler is configured to receive high-temperature steam of a high-pressure cylinder of a steam turbine. The high-temperature steam is used for heating feed water passing through the 0 # high-pressure heater external steam cooler, so that the high-temperature steam is cooled into low-temperature steam, the 0 # high-pressure heating steam trap is configured to receive the low-temperature steam from the 0 # high-pressure heater external steam cooler, and the low-temperature steam is used for heating the feed water passing through the 0 # high-pressure heater external steam cooler; the low-temperature steam is cooled into condensed water; and when the ultra-supercritical unit operates at low load, the No.0 high-pressure heating steam trap is stopped, and low-temperature steam in the No.0 high-pressure heating external steam cooler is guided to the outside, so that external heat supply is realized. According to the system, full-load switching of a steam source of the 0 # high-pressure heater is achieved, the requirement for external heat supply with lower loads can be met, and good economic benefits are achieved.

The utility model relates to an efficient coal-fired generator set. The coal power unit comprises a boiler, a high-pressure cylinder, a back pressure machine and a feed water heating assembly. The steam output end of the boiler is connected with the steam input end of the back pressure machine; the steam output end of the back pressure machine is connected with the steam input end of the high-pressure cylinder; the first steam circulation area of the back pressure machine is smaller than the second steam circulation area of the high-pressure cylinder; the steam output end of the back pressure machine and the steam output end of the high-pressure cylinder are respectively connected with the feed water heating assembly so as to output steam to the feed water heating assembly; the feed water heating assembly is connected with the feed water end of the boiler so as to output feed water heated by steam to the boiler. The coal consumption of the coal power unit can be reduced.

The application discloses a coal powder boiler peak regulation method, which comprises the following steps: modifying the coal powder into high-temperature gas-solid fuel by using a coal powder preheating combustion method; and setting a heat exchange surface in the preheating burner, and heating the boiler feed water before the boiler feed water enters an economizer. The method solves the problem of poor combustion stability of the boiler at low load, increases the temperature of the boiler feed water, reduces the heat absorption amount of the economizer from the flue gas, reduces the temperature drop range of the flue gas through the economizer, increases the flue gas temperature at the inlet of the SCR, and ensures that the SCR denitration system works in a safe and efficient temperature range.

The utility model discloses an energy-saving system for low-load operation of a power station boiler, which comprises a boiler, a first-stage reheater and a second-stage reheater, wherein the first-stage reheater and the second-stage reheater are connected through a pipeline; an outlet of the third-stage superheater is connected with a steam inlet of a steam turbine high-pressure cylinder through a main steam conveying pipe, a steam outlet of the steam turbine high-pressure cylinder is connected with an inlet of a first-stage reheater arranged in a boiler through a cold reheating steam pipe, and an outlet of a second-stage reheater is connected with a steam turbine intermediate-pressure cylinder through a reheating steam conveying pipe. A bypass superheated steam output pipe is connected to a pipeline between the first-stage superheater and the second-stage superheater, a bypass cold reheating steam pipe is arranged on the cold reheating steam pipe, the bypass superheated steam output pipe and the bypass cold reheating steam pipe are both connected with an ejector, and an outlet of the ejector is connected with a heat user through an ejection steam pipe.

The utility model relates to a TCA water supply system of a gas-steam combined cycle waste heat boiler, and belongs to the technical field of boiler equipment. The device comprises a condensate water pipeline and a low-pressure water supply pipeline, a high-pressure water supply pump is arranged on the low-pressure water supply pipeline, the inlet end of the low-pressure water supply pipeline is connected with a low-pressure steam pocket, and the outlet end of the low-pressure water supply pipeline is connected with the water supply inlet end of a TCA cooler; the inlet end of the condensate water pipeline is connected with the condensate pump, and the outlet end of the condensate water pipeline is connected with the inlet end of the high-pressure feed pump; under the condition that the operation requirement of the TCA cooler is completely met, a TCA pump and corresponding valve groups and pipelines are omitted on the condensate water pipeline, so that the configuration cost of the system is reduced, the occupied space of the system is reduced, the control logic of the system is simplified, and the economical efficiency of the whole unit is improved.

The present invention belongs to the technical field of molten salt heat storage in thermal power plants, and specifically discloses a reheat steam staged regulation power station deep peak regulation heat storage and release system and method. Based on the use of reheat steam to heat low-temperature molten salt, the present invention adds electric heating, extracts air from the reheat steam to exchange heat with the molten salt, and adopts electric heating and molten salt heat exchange staged to improve the stability of the system, the flexibility of heat storage and the efficiency of heat storage. The present invention is suitable for the flexible transformation of thermal power plants.

The utility model discloses a waste heat recycling system of a gas-steam boiler, which comprises a softened water supply unit, a flue gas waste heat recycling unit, a pollution discharge waste heat recycling unit and a condensate water waste heat recycling unit, and the soft pollution discharge waste heat recycling unit comprises a first flash tank, a first drain valve group and a continuous heat exchanger. And the first flash tank and the first drain valve group are arranged between the gas-steam boiler and the continuous blowdown expander. According to the utility model, the steam heat recovered by the blowdown waste heat recovery unit is supplied to the thermal deaerator, is treated by the thermal deaerator and then is fed into the gas-steam boiler, so that the feed water temperature of the gas-steam boiler is increased, and the gas consumption of the gas-steam boiler is further reduced; the hot water waste heat of the pollution discharge waste heat recovery unit and the flue gas waste heat recovery unit can heat water in the heat preservation water tank, and the water supply temperature of the gas-steam boiler is increased.

This utility model discloses a water-saving device for a waste heat boiler deaerator, including a deaerator tower for removing dissolved oxygen from water, a demineralized water tank below the deaerator tower, a deaerator inlet pipe connected to the deaerator tower for water intake, a steam pipe connected to the deaerator tower for deoxygenation, and a louvered steam-water separator connected to the top of the deaerator tower for steam-water separation. The tail end of the louvered steam-water separator is connected to a first bend, the tail end of the first bend is connected to a second bend, the tail end of the second bend is connected to a vertical pipe, the tail end of the vertical pipe is connected to a perforated plate steam-water separator for steam-water separation, and the tail end of the perforated plate steam-water separator is connected to a third bend. By adding a steam-water separator, not only is water loss during the deaerator deoxygenation process reduced, but the problem of steam-water separation during deaerator venting in a thermal deaerator system is also solved. Furthermore, the temperature of the deaerator can be better controlled when the deaerator steam pressure changes.

The present invention discloses a heat recovery system, including a main steam pipeline, an additional pipeline, a feedwater heater, and a steam-side regulating valve arranged on the additional pipeline, wherein the steam-side regulating valve is used to regulate the main steam in the additional pipeline, so as to control the extraction pressure after the steam-side regulating valve to control the outlet temperature of the feedwater heater to meet the required final feedwater temperature. This system solves the problems of low coal powder burnout rate, black smoke from fuel oil, low-temperature condensation, ash blockage, corrosion and other equipment in the tail flue during the startup phase without setting an additional steam extraction port on the steam turbine, and can also ensure that the unit can be put into the SCR denitration device before being connected to the grid, and prolong the life of the SCR catalyst.

The present invention discloses a boiler feed water deoxygenation system and method. The system includes a deaerator and a desalted water tank. The upper part of the deaerator is a deaerator tower, the lower part of the deaerator is a deaerator water tank and a deaerator water jet tank, the deaerator tower and the deaerator water tank are connected, the top of the deaerator tower is provided with an exhaust port I, the top of the deaerator water jet tank is provided with a deaerator water jet inlet, the bottom of the deaerator water jet tank is provided with a deaerator water jet outlet, the middle of the deaerator water jet tank is provided with an overflow port, and the top of the deaerator water jet tank is provided with a water ejector, the exhaust port I is connected to the air inlet of the water ejector; the desalted water tank is provided with a desalted water inlet and a desalted water outlet, the desalted water inlet is connected to the overflow port on the deaerator water jet tank through a pipeline, and the desalted water outlet is connected to the deaerator water jet inlet through a pipeline. The present invention eliminates the chemical assisted deoxygenation system, adds a circulating water tank of the desalted water tank, avoids the corrosion of the equipment by the chemical assisted deoxygenation additive, and is conducive to the maintenance of the equipment.

The coal-fired boiler pulverized coal supply system comprises a coal mill, a plurality of pulverized coal conveying pipes communicated with a boiler combustion chamber are arranged on the coal mill, a sleeve heat exchanger is arranged on the peripheries of the pulverized coal conveying pipes in a sealed mode, and spiral flow deflectors are arranged on the inner wall of the sleeve heat exchanger. One end of the sleeve heat exchanger is communicated with a high-temperature steam supply pipe or a superheated steam output pipe of a boiler outlet through a steam input pipeline provided with a sleeve heat exchanger inlet adjusting valve, and the other end of the sleeve heat exchanger is communicated with a low-temperature steam output pipe through an output pipeline provided with a sleeve heat exchanger outlet isolating valve. The output end of the low-temperature steam output pipe is connected with a first high-pressure heater of the steam turbine, a to-be-heated medium inlet of the first high-pressure heater of the steam turbine is connected with a low-temperature water supply pipe, and a heating medium outlet of the first high-pressure heater of the steam turbine is connected with the high-pressure heater through a pipeline. An outlet of the high-pressure heater is connected with a heat exchange pipe on the inner wall of the boiler through a high-temperature water supply pipe.

The utility model discloses a system for synchronously increasing the low-load hot air temperature of a coal-fired boiler and the feed water temperature of the boiler by using main steam, which is characterized in that a part of superheated steam is extracted from a main steam pipeline at an outlet of the boiler and enters a hot air heat exchanger after being subjected to pressure reduction by a pressure reducing valve and temperature reduction by desuperheating water; the hot air heat exchanger achieves the effect that superheated steam obtained after temperature and pressure reduction heats hot primary air at an outlet of the air preheater, the heated hot primary air is sent to the coal mill to improve the drying output of the coal pulverizing system, steam obtained after heat release is sent to the first high-pressure heater, and steam at an inlet of the original first high-pressure heater is isolated. Inlet steam of the first high-pressure heater is changed into superheated steam subjected to pressure reduction and temperature reduction from original first-section extraction steam. According to the system, the flue gas temperature of the SCR inlet under the low-load working condition of the coal-fired boiler is increased, full-load denitration and deep peak regulation of a unit are facilitated, and combustion stability in the boiler is facilitated; and the coal consumption of the coal-fired boiler under the low-load working condition is reduced.

The present invention discloses a combined heat recovery system, including a high-pressure cylinder of a steam turbine, a main steam pipeline, a conventional final-stage extraction pipeline, an additional pipeline added to the main steam pipeline, a heat exchanger using the main steam in the main steam pipeline as a heat source, a feedwater heater using the exhaust steam of the heat exchanger as a heat source, and a steam-side regulating valve arranged on the additional pipeline, which is used to regulate the main steam in the additional pipeline, so as to control the extraction pressure after the steam-side regulating valve to control the outlet temperature of the feedwater heater to meet the required final feedwater temperature. By using this system, the heat of boiler steam can be recovered during the start-up phase of the unit, and problems such as low coal powder burnout rate, black smoke from fuel oil, and low-temperature condensation, ash blockage, corrosion, etc. in the equipment such as the air preheater of the tail flue during the start-up phase can be solved.

The utility model discloses a system for improving low-load main steam temperature and feed water temperature of a power station boiler, which comprises a boiler, and an economizer, a first-stage superheater, a second-stage superheater and a third-stage superheater which are sequentially connected in series through pipelines in the boiler, and an outlet of the third-stage superheater is connected with a steam inlet of a steam turbine high-pressure cylinder through a main steam pipe. An outlet of a steam turbine high-pressure cylinder is connected with a heating medium inlet of a first high-pressure heater through a first-section steam extraction pipe, and a first-section steam extraction isolation valve is arranged on the first-section steam extraction pipe. A low-temperature water supply pipe is arranged on the first high-pressure heater, and a high-temperature water supply pipe of the first high-pressure heater is connected with an inlet of the economizer. A superheated steam pipe is connected to a pipeline between the first-stage superheater and the second-stage superheater, a superheated steam isolating valve is arranged on the superheated steam pipe, and an outlet of the superheated steam isolating valve is connected with a heating medium inlet of the first high-pressure heater through a superheated steam conveying pipe; and the opening and closing states of the superheated steam isolating valve and the pressure-reducing regulating valve are opposite to the opening and closing states of the first-section steam extraction isolating valve.

The present invention is a system for increasing the temperature of boiler feed water during pipe blowing and a method for using the system. The system includes a feed water pipeline, a deaerator is arranged on the feed water pipeline, the outlet of the deaerator is connected to a feed water pump, the outlet of the feed water pump is connected to a high-pressure heater group, the outlet of the high-pressure heater group can be connected to the boiler water inlet, the deaerator is connected to an auxiliary steam header, the auxiliary steam header can be connected to a cold re-pipeline or a high-pressure heater group through a cold re-to-auxiliary steam header channel, the high-pressure heater group can be connected to a cold re-pipeline or an auxiliary steam header through a cold re-to-heater channel, the auxiliary steam header can be used to heat the feed water in the deaerator and can be used to heat and heat the feed water passing through the high-pressure heater group. The present invention not only uses the deaerator to heat the feed water, but also leads part of the auxiliary steam in the auxiliary steam header to the high-pressure heater group, thereby reducing the temperature and heat storage of the deaerator, reducing heat loss, and improving heat utilization.