CN111486468A - Coal-fired power plant waste heat recovery system and method - Google Patents
Coal-fired power plant waste heat recovery system and method Download PDFInfo
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- CN111486468A CN111486468A CN202010459185.8A CN202010459185A CN111486468A CN 111486468 A CN111486468 A CN 111486468A CN 202010459185 A CN202010459185 A CN 202010459185A CN 111486468 A CN111486468 A CN 111486468A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23J—REMOVAL OR TREATMENT OF COMBUSTION PRODUCTS OR COMBUSTION RESIDUES; FLUES
- F23J15/00—Arrangements of devices for treating smoke or fumes
- F23J15/06—Arrangements of devices for treating smoke or fumes of coolers
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22D—PREHEATING, OR ACCUMULATING PREHEATED, FEED-WATER FOR STEAM GENERATION; FEED-WATER SUPPLY FOR STEAM GENERATION; CONTROLLING WATER LEVEL FOR STEAM GENERATION; AUXILIARY DEVICES FOR PROMOTING WATER CIRCULATION WITHIN STEAM BOILERS
- F22D1/00—Feed-water heaters, i.e. economisers or like preheaters
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F23—COMBUSTION APPARATUS; COMBUSTION PROCESSES
- F23L—SUPPLYING AIR OR NON-COMBUSTIBLE LIQUIDS OR GASES TO COMBUSTION APPARATUS IN GENERAL ; VALVES OR DAMPERS SPECIALLY ADAPTED FOR CONTROLLING AIR SUPPLY OR DRAUGHT IN COMBUSTION APPARATUS; INDUCING DRAUGHT IN COMBUSTION APPARATUS; TOPS FOR CHIMNEYS OR VENTILATING SHAFTS; TERMINALS FOR FLUES
- F23L15/00—Heating of air supplied for combustion
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B15/00—Sorption machines, plants or systems, operating continuously, e.g. absorption type
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
- F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
- F25B27/00—Machines, plants or systems, using particular sources of energy
- F25B27/02—Machines, plants or systems, using particular sources of energy using waste heat, e.g. from internal-combustion engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02A—TECHNOLOGIES FOR ADAPTATION TO CLIMATE CHANGE
- Y02A30/00—Adapting or protecting infrastructure or their operation
- Y02A30/27—Relating to heating, ventilation or air conditioning [HVAC] technologies
- Y02A30/274—Relating to heating, ventilation or air conditioning [HVAC] technologies using waste energy, e.g. from internal combustion engine
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B30/00—Energy efficient heating, ventilation or air conditioning [HVAC]
- Y02B30/62—Absorption based systems
- Y02B30/625—Absorption based systems combined with heat or power generation [CHP], e.g. trigeneration
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E20/00—Combustion technologies with mitigation potential
- Y02E20/34—Indirect CO2mitigation, i.e. by acting on non CO2directly related matters of the process, e.g. pre-heating or heat recovery
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- Mechanical Engineering (AREA)
- General Engineering & Computer Science (AREA)
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Abstract
The invention provides a waste heat recovery system of a coal-fired power plant, which comprises a boiler, an air preheater, a plurality of coolers, a dust remover, a desulfurizing tower, a flue gas condensing heat exchanger, a flue gas reheater and a chimney, wherein the boilers, the air preheater, the coolers, the dust remover, the desulfurizing tower, the flue gas condensing heat exchanger, the flue gas reheater and the chimney are sequentially arranged; the plurality of coolers are sequentially connected in series, the outlet temperatures of the heat exchange media of the plurality of coolers are sequentially reduced, and the plurality of coolers correspond to unused heat utilization equipment; the system comprises an absorption heat pump, a thermocline heat storage tank and a heat supply network, wherein a hot water output end of the thermocline heat storage tank is communicated with the heat supply network; the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network. The cascade utilization of energy is realized, energy conservation, water recovery and thermoelectric decoupling can be realized simultaneously, and the waste heat and water recovery capability of the unit and the operation flexibility of a power station are improved.
Description
Technical Field
The invention relates to the technical field of waste heat recovery of coal-fired power stations, in particular to a waste heat recovery system and method of a coal-fired power station.
Background
Coal remains the main energy source in the world, and coal-fired power generation is the main coal utilization mode. The long-term concern of coal-fired power stations is to improve the efficiency and the operation flexibility of the coal-fired power stations and reduce the emission of pollutants and the resource consumption. Meanwhile, the problems of poor peak regulation capability of a power station and poor flexibility of the unit exist for a long time due to mutual coupling of heat load and electric load of the cogeneration unit, and the thermoelectric decoupling of the thermal power plant is one of the key problems to be solved urgently.
Coal remains the main energy source in the world, and coal-fired power generation is the main coal utilization mode. The long-term attention of the coal-fired power plant is concerned with improving the efficiency and the operation flexibility of the coal-fired power plant, reducing the emission of pollutants and the resource consumption and improving the operation flexibility of the power plant. Cogeneration is one of the effective measures to reduce the energy consumption of coal-fired power stations. However, the cogeneration unit has a strong constraint relation of thermoelectric load coupling, so that the independent regulation capacity of the thermoelectric load and the electric load is weak, the new energy power generation is difficult to be absorbed, the peak regulation capacity is poor, and the like, and the current thermoelectric decoupling mode mostly costs the power generation efficiency. The thermoelectric decoupling is realized, the unit operation flexibility is improved, the flue gas water recovery, the flue gas waste heat recovery and the like of the coal-fired power plant are realized, and the key problems to be solved urgently in the electric power industry of China are solved.
The waste heat recovery of the exhaust smoke of the coal-fired power plant can reduce the heat loss of the exhaust smoke of the boiler, thereby improving the power generation efficiency of the coal-fired power plant. The main technology of the existing flue gas water recovery is a condensation method. The flue gas condensate water is recycled, so that the moisture in the flue gas can be recycled, but the quality of a large amount of latent heat of vaporization released by the condensation of water vapor in the water recycling process is low and difficult to utilize, so that the technical difficulty of reducing the energy consumption and investment of a flue gas water recycling system and improving the operation flexibility of a power station is the problem of energy conservation and emission reduction of a coal-fired power generating set.
Disclosure of Invention
The first purpose of the invention is to provide a waste heat recovery system of a coal-fired power station, which can solve the problem of high energy consumption of the recovery system;
the second purpose of the invention is to provide a coal-fired power plant waste heat recovery method, which adopts the coal-fired power plant waste heat recovery system to recover waste heat.
The invention provides a waste heat recovery system of a coal-fired power plant, which comprises a boiler, an air preheater, a plurality of coolers, a dust remover, a desulfurizing tower, a flue gas condensing heat exchanger, a flue gas reheater and a chimney which are arranged in sequence along the circulation direction of flue gas;
the multiple coolers are sequentially connected in series, the outlet temperatures of heat exchange media of the multiple coolers are sequentially reduced along the circulation direction of the flue gas, and the multiple coolers correspond to unused heat utilization equipment;
the system also comprises an absorption heat pump, an inclined temperature layer heat storage tank and a heat supply network, wherein a hot water output end of the inclined temperature layer heat storage tank is communicated with the heat supply network;
the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
Preferably, the plurality of coolers are respectively a flue gas high-temperature cooler, a flue gas medium-temperature cooler and a flue gas low-temperature cooler;
along the circulation direction of flue gas, the flue gas passageway of flue gas high temperature cooler, flue gas medium temperature cooler and flue gas low temperature cooler communicates in proper order.
Preferably, the system further comprises a turbine cooling heat recovery system, and a medium circulation heat exchange channel is formed between the heat exchange medium pipeline of the flue gas high-temperature cooler and the turbine cooling heat recovery system.
Preferably, the heat exchange medium pipeline of the flue gas medium temperature cooler is communicated with the driving heat source pipeline of the absorption heat pump;
the cooling water pipeline of the absorption heat pump is communicated with the heat exchange medium pipeline of the flue gas condensation heat exchanger, and a medium circulation heat exchange channel is formed among the hot water pipeline of the absorption heat pump, the heat exchange medium pipeline of the flue gas cryocooler and the hot water input end of the thermocline heat storage tank.
Preferably, a medium circulation heat exchange channel is formed between the hot water pipeline of the absorption heat pump and the heat exchange medium pipeline of the flue gas reheater.
Preferably, the boiler also comprises a fan heater, wherein a flue gas channel of the fan heater is communicated with an air inlet of the boiler;
and a medium circulating heat exchange channel is formed between the heat exchange medium pipeline of the air heater and the hot water pipeline of the absorption heat pump.
Preferably, the temperature of the outlet of the working medium side of the air heater is 65-75 ℃, and the air is heated to 70-90 ℃ in the air heater.
Preferably, the heat exchange medium of the flue gas high-temperature cooler and the flue gas low-temperature cooler is water;
the water temperature at the outlet of the flue gas high-temperature cooler is 120-150 ℃;
the outlet water temperature of the flue gas low-temperature cooler is 100-120 ℃.
Preferably, the temperature of the flue gas at the outlet of the flue gas condensation heat exchanger is 42-49 ℃; and the temperature of the flue gas at the outlet of the flue gas reheater is 57-64 ℃.
The coal-fired power plant waste heat recovery method adopts the coal-fired power plant waste heat recovery system, and comprises the following steps:
the method comprises the following steps that flue gas exhausted from a boiler sequentially passes through a plurality of coolers, heat exchange media in the coolers and flue gas flowing through the coolers are subjected to heat exchange and then output heat exchange media with different temperatures, and the heat exchange media are conveyed to different heat utilization equipment according to the difference of direct temperatures of heat exchange to utilize waste heat;
the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
Has the advantages that:
the system adopts a plurality of coolers, and the plurality of coolers can recover heat in flue gas with different temperatures and convey the recovered heat to different heat utilization equipment. If the high-temperature boiler flue gas waste heat is recycled to a turbine regenerative system to heat condensed water so as to reduce the coal consumption of power generation, the middle-temperature part of flue gas waste heat is used for driving an absorption heat pump to recycle heat released in the flue gas condensation process, and the low-temperature part of flue gas waste heat is used for further increasing the temperature of a working medium at the outlet of the heat pump; the flue gas at the outlet of the desulfurizing tower is subjected to water recovery through the condensing heat exchanger, and simultaneously, a large amount of low-level latent heat released due to liquefaction in the water recovery process is utilized. The system is simple and convenient, realizes the cascade utilization of energy, can simultaneously realize energy conservation, water recovery and thermoelectric decoupling, and improves the waste heat and water recovery capability of the unit and the operation flexibility of the power station.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings can be obtained by those skilled in the art without creative efforts.
Fig. 1 is a schematic flow chart of a waste heat recovery system of a coal-fired power plant according to an embodiment of the present invention.
Description of reference numerals:
1: a boiler; 2: an air preheater; 3: flue gas high-temperature cooler, 4: a turbine cooling regenerative system; 5: a flue gas medium temperature cooler; 6: a flue gas cryocooler; 7: a dust remover; 8: a desulfurizing tower; 9: a flue gas condensing heat exchanger; 10: a flue gas reheater; 11: an absorption heat pump; 12: a warm air blower; 13: a thermocline heat storage tank; 14: a heat supply network; 15: and (4) a chimney.
Detailed Description
The technical solutions of the present invention will be described clearly and completely with reference to the following embodiments, and it should be understood that the described embodiments are some, but not all, embodiments of the present invention. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
In the description of the present invention, it is to be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", "clockwise", "counterclockwise", and the like, indicate orientations and positional relationships based on those shown in the drawings, and are used only for convenience of description and simplicity of description, and do not indicate or imply that the device or element being referred to must have a particular orientation, be constructed and operated in a particular orientation, and thus, should not be considered as limiting the present invention.
Furthermore, the terms "first", "second" and "first" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance or implicitly indicating the number of technical features indicated. Thus, features defined as "first", "second", may explicitly or implicitly include one or more of the described features. In the description of the present invention, "a plurality" means two or more unless specifically defined otherwise. Furthermore, the terms "mounted," "connected," and "connected" are to be construed broadly and may, for example, be fixedly connected, detachably connected, or integrally connected; can be mechanically or electrically connected; they may be connected directly or indirectly through intervening media, or they may be interconnected between two elements. The specific meanings of the above terms in the present invention can be understood in specific cases to those skilled in the art.
As shown in fig. 1, the present embodiment provides a waste heat recovery system of a coal-fired power plant, which includes a boiler 1, an air preheater 2, a plurality of coolers, a dust remover 7, a desulfurizing tower 8, a flue gas condensing heat exchanger 9, a flue gas reheater 10 and a chimney 15, which are sequentially arranged along a flue gas circulation direction.
The multiple coolers are sequentially connected in series, the outlet temperatures of heat exchange media of the multiple coolers are sequentially reduced along the circulation direction of the flue gas, and the multiple coolers correspond to unused heat utilization equipment;
the system further comprises an absorption heat pump 11, an inclined temperature layer heat storage tank 13 and a heat supply network 14, and a hot water output end of the inclined temperature layer heat storage tank 13 is communicated with the heat supply network 14.
The heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
The system adopts a plurality of coolers, and the plurality of coolers can recover heat in flue gas with different temperatures and convey the recovered heat to different heat utilization equipment. If the high-temperature boiler flue gas waste heat is recycled to a turbine regenerative system to heat condensed water so as to reduce the coal consumption of power generation, the middle-temperature part of flue gas waste heat is used for driving an absorption heat pump to recycle heat released in the flue gas condensation process, and the low-temperature part of flue gas waste heat is used for further increasing the temperature of a working medium at the outlet of the heat pump; the flue gas at the outlet of the desulfurizing tower is subjected to water recovery through the condensing heat exchanger, and simultaneously, a large amount of low-level latent heat released due to liquefaction in the water recovery process is utilized. The system is simple and convenient, realizes the cascade utilization of energy, can simultaneously realize energy conservation, water recovery and thermoelectric decoupling, and improves the waste heat and water recovery capability of the unit and the operation flexibility of the power station.
The plurality of coolers are respectively a flue gas high-temperature cooler 3, a flue gas medium-temperature cooler 5 and a flue gas low-temperature cooler 6.
Along the flowing direction of the flue gas, the flue gas channels of the flue gas high-temperature cooler 5, the flue gas medium-temperature cooler 5 and the flue gas low-temperature cooler 6 are communicated in sequence.
The coal-fired power plant waste heat recovery system also comprises a turbine cooling heat recovery system 4, and a medium circulating heat exchange channel is formed between the heat exchange medium pipeline of the flue gas high-temperature cooler 3 and the turbine cooling heat recovery system 4.
The flue gas high-temperature cooler 3 is a heat exchanger arranged in a countercurrent mode, and the outlet design water temperature is 120-150 ℃.
Through medium circulation between the flue gas high-temperature cooler 3 and the turbine cooling regenerative system 4, the high-temperature boiler flue gas waste heat can be recycled to the turbine regenerative system to heat condensed water so as to reduce the coal consumption of power generation.
The heat exchange medium pipeline of the flue gas medium temperature cooler 5 is communicated with the driving heat source pipeline of the absorption heat pump 11. A cooling water pipeline of the absorption heat pump 11 is communicated with a heat exchange medium pipeline of the flue gas condensation heat exchanger 9, and a medium circulation heat exchange channel is formed among a hot water pipeline of the absorption heat pump 11, a heat exchange medium pipeline of the flue gas cryocooler 6 and a hot water input end of the thermocline heat storage tank 13.
A medium circulation heat exchange channel is formed between the hot water pipeline of the absorption heat pump 11 and the heat exchange medium pipeline of the flue gas reheater 10.
The waste heat recovery system of the coal-fired power plant also comprises a fan heater 12, and a flue gas channel of the fan heater 12 is communicated with an air inlet of the boiler 1;
a medium circulation heat exchange channel is formed between the heat exchange medium pipeline of the air heater 12 and the hot water pipeline of the absorption heat pump 11.
The temperature of the flue gas at the outlet of the flue gas condensing heat exchanger 9 is 42-49 ℃, and the temperature of the flue gas at the outlet of the flue gas reheater 10 is 57-64 ℃.
The temperature of the outlet of the working medium side of the air heater 12 is 65-75 ℃, and the air is heated to 70-90 ℃ in the air heater 12.
The flue gas low-temperature cooler 6 reduces the temperature of the flue gas to 90-100 ℃, and the temperature of the working medium outlet is 100-120 ℃.
The cooperation mode of the smoke medium temperature cooler 5, the absorption heat pump 11, the smoke low temperature cooler 6, the smoke reheater 10 and the air heater 12 can realize that the absorption heat pump is driven by heat generated by the medium temperature cooler to recover heat released in the smoke condensation process, part of the heat generated by the heat pump is transmitted to the smoke reheater to be used for reheating smoke, part of the heat is used for preheating air, and the rest of the heat is continuously heated in part of the coolers and stored in the inclined temperature layer heat storage tank to supply heat load required by a heat supply network.
In this embodiment, there is also provided a coal-fired power plant waste heat recovery method using the coal-fired power plant waste heat recovery system described above, including the steps of:
the method comprises the following steps that flue gas exhausted from a boiler sequentially passes through a plurality of coolers, heat exchange media in the coolers and flue gas flowing through the coolers are subjected to heat exchange and then output heat exchange media with different temperatures, and the heat exchange media are conveyed to different heat utilization equipment according to the difference of direct temperatures of heat exchange to utilize waste heat;
the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
The specific implementation mode of the waste heat recovery method of the coal-fired power plant is as follows:
boiler exhaust smoke of a boiler 1 firstly enters a smoke high-temperature cooler 3, the smoke is cooled by water led out from a turbine cooling heat return system 4, then the smoke sequentially enters a smoke medium-temperature cooler 5 and a smoke low-temperature cooler 6 to cool the smoke to 90-100 ℃, waste heat recovered by the smoke medium-temperature cooler 5 is used as a heat source to drive an absorption heat pump 11 to recover heat in the smoke condensation process, the smoke low-temperature cooler 6 recovers heat to further promote working medium heat at the outlet of the absorption heat pump 11, then the smoke is dedusted by a deduster 7, desulfurized in a desulfurizing tower 8, the smoke enters a smoke condensation heat exchanger 9, moisture in the smoke is condensed and recovered, the heat is absorbed by the absorption heat pump 11 from the smoke condensation heat exchanger 9, a part of hot water working medium heated by the absorption heat pump 11 is shunted and enters a smoke reheater 10 for reheating the smoke to prevent low-temperature, the cooled working medium returns to the low-temperature side inlet of the heat pump 11, the other part of the working medium enters the air heater 12 for preheating air, and the rest of the working medium enters the flue gas low-temperature cooler 5 for continuously absorbing heat and raising the temperature to 100-120 ℃; when the unit can not satisfy the external heat supply demand, the heat of the thermocline heat storage tank 13 is sent into the heat supply network for heat supply, and when the unit can satisfy the external heat supply demand, the heat recovered by the heat pump 11 exists in the thermocline heat storage tank 13, so that the thermoelectric decoupling operation is realized.
Finally, it should be noted that: the above embodiments are only used to illustrate the technical solution of the present invention, and not to limit the same; while the invention has been described in detail and with reference to the foregoing embodiments, it will be understood by those skilled in the art that: the technical solutions described in the foregoing embodiments may still be modified, or some or all of the technical features may be equivalently replaced; and the modifications or the substitutions do not make the essence of the corresponding technical solutions depart from the scope of the technical solutions of the embodiments of the present invention.
Claims (10)
1. A waste heat recovery system of a coal-fired power plant is characterized by comprising a boiler, an air preheater, a plurality of coolers, a dust remover, a desulfurizing tower, a flue gas condensing heat exchanger, a flue gas reheater and a chimney which are sequentially arranged along the circulation direction of flue gas;
the multiple coolers are sequentially connected in series, the outlet temperatures of heat exchange media of the multiple coolers are sequentially reduced along the circulation direction of the flue gas, and the multiple coolers correspond to unused heat utilization equipment;
the system also comprises an absorption heat pump, an inclined temperature layer heat storage tank and a heat supply network, wherein a hot water output end of the inclined temperature layer heat storage tank is communicated with the heat supply network;
the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
2. The coal-fired power plant waste heat recovery system of claim 1, wherein the plurality of coolers are a flue gas high temperature cooler, a flue gas medium temperature cooler and a flue gas low temperature cooler, respectively;
along the circulation direction of flue gas, the flue gas passageway of flue gas high temperature cooler, flue gas medium temperature cooler and flue gas low temperature cooler communicates in proper order.
3. The coal-fired power plant waste heat recovery system of claim 2, further comprising a turbine cooling regenerative system, wherein a medium circulation heat exchange channel is formed between the heat exchange medium pipeline of the flue gas high temperature cooler and the turbine cooling regenerative system.
4. The coal-fired power plant waste heat recovery system of claim 2, wherein the heat exchange medium pipeline of the flue gas moderate temperature cooler is communicated with the driving heat source pipeline of the absorption heat pump;
the cooling water pipeline of the absorption heat pump is communicated with the heat exchange medium pipeline of the flue gas condensation heat exchanger, and a medium circulation heat exchange channel is formed among the hot water pipeline of the absorption heat pump, the heat exchange medium pipeline of the flue gas cryocooler and the hot water input end of the thermocline heat storage tank.
5. The coal-fired power plant waste heat recovery system of claim 4, characterized in that a medium circulation heat exchange channel is formed between the hot water pipeline of the absorption heat pump and the heat exchange medium pipeline of the flue gas reheater.
6. The coal-fired power plant waste heat recovery system of claim 4, further comprising a fan heater, wherein a flue gas channel of the fan heater is communicated with an air inlet of the boiler;
and a medium circulating heat exchange channel is formed between the heat exchange medium pipeline of the air heater and the hot water pipeline of the absorption heat pump.
7. The coal-fired power plant waste heat recovery system of claim 6, characterized in that the outlet temperature of the working medium side of the air heater is 65-75 ℃, and the air is heated to 70-90 ℃ in the air heater.
8. The coal-fired power plant waste heat recovery system of claim 2, wherein the heat exchange medium of the flue gas high temperature cooler and the flue gas low temperature cooler is water;
the water temperature at the outlet of the flue gas high-temperature cooler is 120-150 ℃;
the outlet water temperature of the flue gas low-temperature cooler is 100-120 ℃.
9. The coal-fired power plant waste heat recovery system of claim 5, wherein the flue gas temperature at the outlet of the flue gas condensation heat exchanger is 42-49 ℃; and the temperature of the flue gas at the outlet of the flue gas reheater is 57-64 ℃.
10. A coal-fired power plant waste heat recovery method, characterized by using the coal-fired power plant waste heat recovery system according to any one of claims 1 to 9, comprising the steps of:
the method comprises the following steps that flue gas exhausted from a boiler sequentially passes through a plurality of coolers, heat exchange media in the coolers and flue gas flowing through the coolers are subjected to heat exchange and then output heat exchange media with different temperatures, and the heat exchange media are conveyed to different heat utilization equipment according to the difference of direct temperatures of heat exchange to utilize waste heat;
the heat generated by the part of coolers is used for driving the absorption heat pump to recover the heat released in the flue gas condensation process, part of the heat generated by the heat pump is transmitted to the flue gas reheater to be used for reheating the flue gas, part of the heat is used for preheating air, and the rest part of the heat is continuously heated in the part of coolers and stored in the inclined temperature layer heat storage tank to supply heat loads required by a heat network.
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| CN202010459185.8A CN111486468A (en) | 2020-05-27 | 2020-05-27 | Coal-fired power plant waste heat recovery system and method |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN112283694A (en) * | 2020-10-26 | 2021-01-29 | 西安交通大学 | Low-temperature flue gas water recovery and waste heat utilization coupling system of coal-fired power plant and operation method |
| CN113680295A (en) * | 2021-08-25 | 2021-11-23 | 山西清迪环保科技有限公司 | Method and system for supplying heat to desulfurization sulfur recovery system by using coking crude benzene hot lean oil |
| CN114413311A (en) * | 2022-01-20 | 2022-04-29 | 大唐环境产业集团股份有限公司 | Cold-end waste heat supply system of coal-fired unit of coupling thermocline heat storage tank and operation method |
| CN115164262A (en) * | 2022-07-13 | 2022-10-11 | 西安热工研究院有限公司 | Waste heat and water recovery system of cogeneration unit and operation method |
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2020
- 2020-05-27 CN CN202010459185.8A patent/CN111486468A/en active Pending
Cited By (7)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112283694A (en) * | 2020-10-26 | 2021-01-29 | 西安交通大学 | Low-temperature flue gas water recovery and waste heat utilization coupling system of coal-fired power plant and operation method |
| CN112283694B (en) * | 2020-10-26 | 2021-07-09 | 西安交通大学 | Low-temperature flue gas water recovery and waste heat utilization coupling system of coal-fired power plant and operation method |
| CN113680295A (en) * | 2021-08-25 | 2021-11-23 | 山西清迪环保科技有限公司 | Method and system for supplying heat to desulfurization sulfur recovery system by using coking crude benzene hot lean oil |
| CN114413311A (en) * | 2022-01-20 | 2022-04-29 | 大唐环境产业集团股份有限公司 | Cold-end waste heat supply system of coal-fired unit of coupling thermocline heat storage tank and operation method |
| CN114413311B (en) * | 2022-01-20 | 2023-07-14 | 大唐环境产业集团股份有限公司 | Cold end waste heat supply system of coal-fired unit of coupling oblique temperature layer heat storage tank and operation method |
| CN115164262A (en) * | 2022-07-13 | 2022-10-11 | 西安热工研究院有限公司 | Waste heat and water recovery system of cogeneration unit and operation method |
| CN115164262B (en) * | 2022-07-13 | 2024-01-23 | 西安热工研究院有限公司 | Waste heat and water recovery system of cogeneration unit and operation method |
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