CN116464525A - Supercritical carbon dioxide coal-fired power generation system integrating heat storage and operation method - Google Patents

Supercritical carbon dioxide coal-fired power generation system integrating heat storage and operation method Download PDF

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Publication number
CN116464525A
CN116464525A CN202310301713.0A CN202310301713A CN116464525A CN 116464525 A CN116464525 A CN 116464525A CN 202310301713 A CN202310301713 A CN 202310301713A CN 116464525 A CN116464525 A CN 116464525A
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inlet
heat
outlet
regenerator
temperature
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赵永亮
孙瑞强
刘明
杨明锐
郑则刚
严俊杰
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Xian Jiaotong University
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Xian Jiaotong University
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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/32—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines using steam of critical or overcritical pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
    • F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
    • F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
    • F01K25/103—Carbon dioxide
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K7/00—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating
    • F01K7/02—Steam engine plants characterised by the use of specific types of engine; Plants or engines characterised by their use of special steam systems, cycles or processes; Control means specially adapted for such systems, cycles or processes; Use of withdrawn or exhaust steam for feed-water heating the engines being of multiple-expansion type
    • 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
    • F25B40/00—Subcoolers, desuperheaters or superheaters
    • F25B40/06—Superheaters
    • 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
    • F25B41/00—Fluid-circulation arrangements
    • F25B41/40—Fluid line arrangements
    • 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
    • F25B43/00—Arrangements for separating or purifying gases or liquids; Arrangements for vaporising the residuum of liquid refrigerant, e.g. by heat
    • F25B43/006—Accumulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F28—HEAT EXCHANGE IN GENERAL
    • F28D—HEAT-EXCHANGE APPARATUS, NOT PROVIDED FOR IN ANOTHER SUBCLASS, IN WHICH THE HEAT-EXCHANGE MEDIA DO NOT COME INTO DIRECT CONTACT
    • F28D20/00—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00
    • F28D2020/0004—Particular heat storage apparatus

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Analytical Chemistry (AREA)
  • Power Engineering (AREA)
  • Engine Equipment That Uses Special Cycles (AREA)

Abstract

The invention discloses an integrated heat-storage supercritical carbon dioxide coal-fired power generation system and an operation method thereof, wherein the system comprises a reheating recompression power generation system, a heat storage system and a heat release system; the heat storage system is shared with equipment of the heat release system and comprises a high-temperature heat exchanger, a heat storage hot tank, a heat storage cold tank, an auxiliary turbine and an auxiliary heat regenerator. When the heat is stored, the air exhaust before the high-pressure turbine is used for heating the heat storage material, so that the working flow of the high-pressure turbine and the low-pressure turbine is reduced while the high-temperature heat of the air exhaust is stored, and the load of a unit is further reduced; during heat release, the stored high-temperature heat is adopted to heat the split-flow working medium from the inlet side of the high-temperature heat regenerator, and the heated working medium enters the auxiliary turbine to do work, so that the load of the unit is improved. In addition, the auxiliary heat regenerator also recovers the heat of the working medium at the outlet of the auxiliary turbine, is used for preheating the split-flow working medium at the inlet side of the high-temperature heat regenerator, and improves the system efficiency. The invention improves the flexibility of the coal-fired power generator set, reduces the minimum operation load of the set and improves the load changing rate by integrating the heat storage cycle and the heat release cycle.

Description

Supercritical carbon dioxide coal-fired power generation system integrating heat storage and operation method
Technical Field
The invention belongs to the technical field of power generation, and particularly relates to a supercritical carbon dioxide coal-fired power generation system integrating heat storage and an operation method.
Background
Supercritical carbon dioxide is a novel circulation working medium with great potential. The critical point of carbon dioxide is close to the ambient temperature and has high density, and higher power density and compact turbine and heat exchanger equipment can be realized. The supercritical carbon dioxide power cycle realizes energy conversion based on the Brayton cycle principle, has higher energy conversion efficiency compared with the conventional steam power cycle, and has great application potential in the field of coal-fired power generation.
Along with the acceleration of the transformation of the electric power system in China, the urgent technical requirements of higher efficiency and more flexibility are provided for the coal-fired power generation industry so as to provide peak shaving service for new energy consumption better. One of the flexibility requirements of the coal-fired power generator unit is that the unit can greatly change load operation in the aspect of steady-state working conditions and realize ultra-low load operation, and the load can be quickly lifted in the transient process of the variable working conditions. The coal-fired power generation system using supercritical carbon dioxide as a working medium can improve the efficiency of a unit, but the flexibility is still limited by the minimum stable combustion load of a boiler, the coupling limit of the energy flow of the boiler and the turbine, and the like, and the operation flexibility is required to be improved.
Disclosure of Invention
The invention provides an integrated heat storage supercritical carbon dioxide coal-fired power generation system and an operation method thereof, which are used for further improving the flexibility of a supercritical carbon dioxide coal-fired power generation unit, widening a variable load interval and improving a variable load rate.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the supercritical carbon dioxide coal-fired power generation system with integrated heat storage comprises a reheating recompression power generation system, a heat storage system and a heat release system;
the reheating recompression power generation system specifically comprises a boiler 1, a high-pressure turbine 2, a low-pressure turbine 3, a recompression 4, a main compressor 6, a cooler 5, a low-temperature regenerator 7 and a high-temperature regenerator 8; the outlet of the main compressor 6 is sequentially connected with the cold side of the low-temperature heat regenerator 7 and the cold side of the high-temperature heat regenerator 8, the outlet of the cold side of the high-temperature heat regenerator 8 is connected with the boiler 1, the outlet working medium of the boiler 1 is connected with the inlet of the high-pressure turbine 2, the outlet working medium of the high-pressure turbine 2 is connected with the boiler 1, the outlet reheated working medium of the boiler 1 is connected with the inlet of the low-pressure turbine 3, the outlet of the low-pressure turbine 3 is sequentially connected with the hot side of the high-temperature heat regenerator 8 and the hot side of the low-temperature heat regenerator 7, the outlet of the hot side of the low-temperature heat regenerator 7 is respectively connected with the inlet of the recompression 4 and the inlet of the cooler 5, the outlet of the recompression 4 and the outlet of the cold side of the low-temperature heat regenerator 7 are connected with the inlet of the cold side of the high-temperature heat regenerator 8, and the outlet of the cooler 5 is connected with the inlet of the main compressor 6; the cold side inlet of the high-temperature heat regenerator 8 is also provided with a shunt pipeline which is also connected with the tail inlet of the boiler 1; the high-temperature heat exchanger 13, the heat storage cold tank 12, the heat storage hot tank 11 and the auxiliary turbine 10 form a heat storage system and a heat release system at the same time; when the heat storage system is formed, the hot side inlet of the high-temperature heat exchanger 13 is connected with the inlet of the high-pressure turbine 2, the hot side outlet of the high-temperature heat exchanger 13 is connected with the inlet of the auxiliary turbine 10, and the cold side inlet and the outlet of the high-temperature heat exchanger 13 are respectively connected with the heat storage cold tank 12 and the heat storage hot tank 11;
when the heat release system is formed, the inlet of the cold side of the high-temperature heat exchanger 13 is connected with the diversion pipeline of the inlet of the cold side of the high-temperature heat regenerator 8, the outlet of the cold side of the high-temperature heat exchanger 13 is connected with the inlet of the auxiliary turbine 10, and the inlet and the outlet of the hot side of the high-temperature heat exchanger 13 are respectively connected with the heat storage hot tank 11 and the heat storage cold tank 12;
a valve 141 is arranged on a connecting pipeline of the boiler 1 and the inlet of the high-pressure turbine 2, a valve 142 is arranged on a connecting pipeline of the high-temperature heat exchanger 13 and the inlet of the high-pressure turbine 2, and a valve 143 is arranged on a connecting pipeline of the high-temperature heat exchanger 13 and the cold side inlet split flow of the high-temperature heat regenerator 8.
Also comprises an auxiliary regenerator 9; when in heat storage, the inlet and outlet of the hot side of the auxiliary heat regenerator 9 are respectively connected with the outlet of the auxiliary turbine 10 and the inlet of the hot side of the low-temperature heat regenerator 7, and the inlet and outlet of the cold side of the auxiliary heat regenerator 9 are respectively connected with the diversion pipeline of the inlet of the cold side of the high-temperature heat regenerator 8 and the inlet of the tail part of the boiler 1; the connection relationship at the time of heat release is the same as that at the time of heat storage.
The inlet temperature of the main compressor 6 is 32-42 ℃.
The inlet pressure of the main compressor 6 is 7.5-9.0MPa.
The operation method of the supercritical carbon dioxide coal-fired power generation system integrating heat storage comprises a conventional operation mode, a heat storage operation mode and a heat release operation mode:
in the conventional operation mode, the valve 142 and the valve 143 are closed, the valve 141 is opened, the high-temperature high-pressure carbon dioxide working medium at the outlet of the boiler 1 firstly enters the high-pressure turbine 2 to do work, the working medium at the outlet of the high-pressure turbine 2 is reheated by the boiler 1 and then enters the low-pressure turbine 3 to do work, and the working medium at the outlet of the low-pressure turbine 3 is sequentially subjected to heat release by the high-temperature regenerator 8 and the low-temperature regenerator 7 and then is divided into two parts: a part of the compressed air is compressed and boosted by a recompressor 4; the other part is cooled by a cooler 5 and then enters a main compressor 6 for compression and boosting, the working medium at the outlet of the main compressor 6 enters a low-temperature heat regenerator 7 for heating, and the working medium at the outlet of the cold side of the low-temperature heat regenerator 7 is split again after being converged with the working medium at the outlet of a recompression 4: part of the heated water enters the boiler 1 after being heated by the high-temperature heat regenerator 8; the other part of working medium directly enters the tail part of the boiler 1 to absorb the heat of the medium-low temperature flue gas, and two fluids are converged in the boiler;
the heat storage operation mode is based on the conventional operation mode, and the valve number two 142 is opened; the inlet working medium of the high-pressure turbine 2 is shunted to heat the heat storage material from the heat storage cold tank 12 in the high-temperature heat exchanger 13, and the heat storage material is stored in the heat storage hot tank 11 after being heated to a high-temperature state; the working medium flow of the high-pressure turbine 2 and the low-pressure turbine 3 is reduced through diversion, so that the load of a unit is rapidly reduced;
the exothermic mode of operation opens valve number three 143 based on the normal mode of operation; the flow of the system and the flow of a diversion pipeline at the cold side inlet of the high-temperature heat regenerator 8 are increased, the high-temperature heat storage materials stored in the heat storage heat tank 11 are released, carbon dioxide working media from the diversion pipeline at the cold side inlet of the high-temperature heat regenerator 8 are heated in the high-temperature heat exchanger 13, and the working media heated at the outlet of the high-temperature heat exchanger 13 enter the auxiliary turbine 10 to do work and generate electricity, so that the load of a unit is rapidly increased.
In the heat storage operation mode, in order to reduce the pressure of the working medium at the outlet of the high-temperature heat exchanger 13, the carbon dioxide working medium at the outlet of the high-temperature heat exchanger 13 enters the auxiliary turbine 10 to expand and do work, and the working medium at the outlet of the auxiliary turbine 10 is heated in the auxiliary regenerator 9 and then is converged into the hot side inlet of the low-temperature regenerator 7 after being split-flow working medium from the cold side inlet of the high-temperature regenerator 8.
In the heat release operation mode, the working medium at the outlet of the auxiliary turbine 10 releases heat in the auxiliary heat regenerator 9, heats the split working medium from the cold side inlet of the high-temperature heat regenerator 8, and finally merges into the hot side inlet of the low-temperature heat regenerator 7.
Compared with the prior art, the invention has the following advantages:
1) According to the invention, the turbine flow is reduced by air extraction, so that the rapid load reduction is realized; and the auxiliary turbine does work to realize rapid load lifting, so that the variable load rate of the unit is improved.
2) The integrated heat storage system can reduce the minimum operation load of the coal-fired generator set through air extraction and heat storage, improve the output power of the generator set through heat release, widen the operation load interval of the generator set and enhance the flexibility.
3) The heat storage and heat release circulation of the invention are similar, the equipment is universal, and the structure of the integrated system can be greatly simplified.
Drawings
Fig. 1 is a schematic diagram of an integrated heat storage supercritical carbon dioxide coal-fired power generation system of the invention, wherein a solid line is a heat storage cycle, and a dotted line is a heat release cycle.
FIG. 2 (a) is a schematic diagram of a conventional mode of operation of a supercritical carbon dioxide coal-fired power generation system;
FIG. 2 (b) schematic diagram of a heat storage mode;
FIG. 2 (c) is a schematic diagram of the exothermic pattern.
Detailed Description
The invention is described in further detail below with reference to the drawings and the detailed description.
As shown in FIG. 1, the supercritical carbon dioxide coal-fired power generation system integrating heat storage comprises a reheating recompression power generation system, a heat storage system and a heat release system:
the reheating recompression power generation system specifically comprises a boiler 1, a high-pressure turbine 2, a low-pressure turbine 3, a recompression 4, a main compressor 6, a cooler 5, a low-temperature regenerator 7 and a high-temperature regenerator 8; the outlet of the main compressor 6 is sequentially connected with the cold side of the low-temperature heat regenerator 7 and the cold side of the high-temperature heat regenerator 8, the outlet of the cold side of the high-temperature heat regenerator 8 is connected with the boiler 1, the outlet working medium of the boiler 1 is connected with the inlet of the high-pressure turbine 2, the outlet working medium of the high-pressure turbine 2 is connected with the boiler 1, the outlet reheated working medium of the boiler 1 is connected with the inlet of the low-pressure turbine 3, the outlet of the low-pressure turbine 3 is sequentially connected with the hot side of the high-temperature heat regenerator 8 and the hot side of the low-temperature heat regenerator 7, the outlet of the hot side of the low-temperature heat regenerator 7 is respectively connected with the inlet of the recompression 4 and the inlet of the cooler 5, the outlet of the recompression 4 and the outlet of the cold side of the low-temperature heat regenerator 7 are connected with the inlet of the cold side of the high-temperature heat regenerator 8, and the outlet of the cooler 5 is connected with the inlet of the main compressor 6; the cold side inlet of the high temperature heat regenerator 8 is also provided with a shunt pipeline which is also connected with the tail inlet of the boiler 1.
The heat storage system specifically comprises a high-temperature heat exchanger 13, a heat storage cold tank 12, a heat storage hot tank 11 and an auxiliary turbine 10; the hot side inlet of the high-temperature heat exchanger 13 is connected with the inlet of the high-pressure turbine 2, the hot side outlet of the high-temperature heat exchanger 13 is connected with the inlet of the auxiliary turbine 10, and the cold side inlet and the outlet of the high-temperature heat exchanger 13 are respectively connected with the heat storage cold tank 12 and the heat storage hot tank 11.
The heat release system specifically comprises a high-temperature heat exchanger 13, a heat storage cold tank 12, a heat storage hot tank 11 and an auxiliary turbine 10; the inlet of the cold side of the high-temperature heat exchanger 13 is connected with the diversion pipeline of the inlet of the cold side of the high-temperature heat regenerator 8, the outlet of the cold side of the high-temperature heat exchanger 13 is connected with the inlet of the auxiliary turbine 10, and the inlet and the outlet of the hot side of the high-temperature heat exchanger 13 are respectively connected with the heat storage hot tank 11 and the heat storage cold tank 12.
The system further comprises an auxiliary regenerator 9; when in heat storage, the inlet and outlet of the hot side of the auxiliary heat regenerator 9 are respectively connected with the outlet of the auxiliary turbine 10 and the inlet of the hot side of the low-temperature heat regenerator 7, and the inlet and outlet of the cold side of the auxiliary heat regenerator 9 are respectively connected with the diversion pipeline of the inlet of the cold side of the high-temperature heat regenerator 8 and the inlet of the tail part of the boiler 1; the connection relationship at the time of heat release is the same as that at the time of heat storage.
A valve 141 is arranged on a connecting pipeline between the boiler 1 and the inlet of the high-pressure turbine 2, a valve 142 is arranged on a connecting pipeline between the high-temperature heat exchanger 13 and the inlet of the high-pressure turbine 2, and a valve 143 is arranged on a connecting pipeline between the high-temperature heat exchanger 13 and the inlet of the high-temperature regenerator 8 for shunting.
The inlet temperature of the main compressor 6 is 32-42 ℃.
The inlet pressure of the main compressor 6 is 7.5-9.0MPa.
The operation method of the supercritical carbon dioxide coal-fired power generation system integrating heat storage is characterized by comprising a conventional operation mode, a heat storage operation mode and a heat release operation mode:
in the conventional operation mode, the valve 142 and the valve 143 are closed, the valve 141 is opened, the high-temperature high-pressure carbon dioxide working medium at the outlet of the boiler 1 firstly enters the high-pressure turbine 2 to do work, the working medium at the outlet of the high-pressure turbine 2 is reheated by the boiler 1 and then enters the low-pressure turbine 3 to do work, and the working medium at the outlet of the low-pressure turbine 3 is sequentially subjected to heat release by the high-temperature regenerator 8 and the low-temperature regenerator 7 and then is divided into two parts: a part of the compressed air is compressed and boosted by a recompressor 4; the other part is cooled by a cooler 5 and then enters a main compressor 6 for compression and boosting, the working medium at the outlet of the main compressor 6 enters a low-temperature heat regenerator 7 for heating, and the working medium at the outlet of the cold side of the low-temperature heat regenerator 7 is split again after being converged with the working medium at the outlet of a recompression 4: part of the heated water enters the boiler 1 after being heated by the high-temperature heat regenerator 8; the other part of working medium directly enters the tail part of the boiler 1 to absorb the heat of the medium-low temperature flue gas, and the two fluids are converged in the boiler, as shown in fig. 2 (a);
the heat storage operation mode is based on the conventional operation mode, and the valve number two 142 is opened; the inlet working medium of the high-pressure turbine 2 is shunted out to heat the heat storage material from the heat storage cold tank 12 in the high-temperature heat exchanger 13, the heat storage material can be molten salt, and the heat storage material is stored in the heat storage hot tank 11 after being heated to a high-temperature state; the working medium flow of the high-pressure turbine 2 and the low-pressure turbine 3 is reduced through diversion, so that the load of a unit is rapidly reduced; in addition, in order to reduce the pressure of the working medium at the outlet of the high-temperature heat exchanger 13, the carbon dioxide working medium at the outlet of the high-temperature heat exchanger 13 enters the auxiliary turbine 10 to expand and do work, and the working medium at the outlet of the auxiliary turbine 10 is converged into the hot side inlet of the low-temperature heat regenerator 7 after being heated in the auxiliary heat regenerator 9 from the cold side inlet of the high-temperature heat regenerator 8, as shown in fig. 2 (b).
The exothermic mode of operation opens valve number three 143 based on the normal mode of operation; the flow of the system and the flow of a diversion pipeline at the cold side inlet of the high-temperature heat regenerator 8 are increased, the high-temperature heat storage materials stored in the heat storage heat tank 11 are released, carbon dioxide working media from the diversion pipeline at the cold side inlet of the high-temperature heat regenerator 8 are heated in the high-temperature heat exchanger 13, and the working media heated at the outlet of the high-temperature heat exchanger 13 enter the auxiliary turbine 10 to do work and generate electricity, so that the load of a unit is quickly improved; the working medium at the outlet of the auxiliary turbine 10 releases heat in the auxiliary regenerator 9, heats the split working medium from the cold side inlet of the high temperature regenerator 8, and finally merges into the hot side inlet of the low temperature regenerator 7, as shown in fig. 2 (c).
When the invention stores heat, the air exhaust before the high-pressure turbine is used for heating the heat storage material, so that the working flow of the high-pressure turbine and the low-pressure turbine is reduced while the high-temperature heat of the air exhaust is stored, and the load of a unit is further reduced; during heat release, the stored high-temperature heat is adopted to heat the split-flow working medium from the inlet side of the high-temperature heat regenerator, and the heated working medium enters the auxiliary turbine to do work, so that the load of the unit is improved. In addition, the auxiliary heat regenerator also recovers the heat of the working medium at the outlet of the auxiliary turbine, is used for preheating the split-flow working medium at the inlet side of the high-temperature heat regenerator, and improves the system efficiency. The invention improves the flexibility of the coal-fired power generator set, reduces the minimum operation load of the set and improves the load changing rate by integrating the heat storage cycle and the heat release cycle. Meanwhile, the heat storage circulation and the heat release circulation are shared by the equipment, so that the system structure is greatly simplified.

Claims (7)

1. The integrated heat-storage supercritical carbon dioxide coal-fired power generation system is characterized by comprising a reheating recompression power generation system, a heat storage system and a heat release system;
the reheating recompression power generation system specifically comprises a boiler (1), a high-pressure turbine (2), a low-pressure turbine (3), a recompression (4), a main compressor (6), a cooler (5), a low-temperature regenerator (7) and a high-temperature regenerator (8); the outlet of the main compressor (6) is sequentially connected with the cold side of the low-temperature heat regenerator (7) and the cold side of the high-temperature heat regenerator (8), the outlet of the cold side of the high-temperature heat regenerator (8) is connected with the boiler (1), the outlet working medium of the boiler (1) is connected with the inlet of the high-pressure turbine (2), the outlet working medium of the high-pressure turbine (2) is connected with the boiler (1), the outlet of the boiler (1) is reheated working medium and the inlet of the low-pressure turbine (3), the outlet of the low-pressure turbine (3) is sequentially connected with the hot side of the high-temperature heat regenerator (8) and the hot side of the low-temperature heat regenerator (7), the outlet of the low-temperature heat regenerator (7) is respectively connected with the inlet of the recompressor (4) and the inlet of the cooler (5), and the outlet of the cold side of the recompressor (7) is connected with the inlet of the cold side of the high-temperature heat regenerator (8), and the outlet of the cooler (5) is connected with the inlet of the main compressor (6); the cold side inlet of the high-temperature heat regenerator (8) is also provided with a shunt pipeline which is also connected with the tail inlet of the boiler (1); the high-temperature heat exchanger (13), the heat storage cold tank (12), the heat storage hot tank (11) and the auxiliary turbine (10) form a heat storage system and a heat release system at the same time; when the heat storage system is formed, the hot side inlet of the high-temperature heat exchanger (13) is connected with the inlet of the high-pressure turbine (2), the hot side outlet of the high-temperature heat exchanger (13) is connected with the inlet of the auxiliary turbine (10), and the cold side inlet and the outlet of the high-temperature heat exchanger (13) are respectively connected with the heat storage cold tank (12) and the heat storage hot tank (11);
when the heat release system is formed, a cold side inlet of the high-temperature heat exchanger (13) is connected with a diversion pipeline of a cold side inlet of the high-temperature heat regenerator (8), a cold side outlet of the high-temperature heat exchanger (13) is connected with an inlet of the auxiliary turbine (10), and a hot side inlet and an outlet of the high-temperature heat exchanger (13) are respectively connected with the heat storage hot tank (11) and the heat storage cold tank (12);
a first valve (141) is arranged on a connecting pipeline of the boiler (1) and the inlet of the high-pressure turbine (2), a second valve (142) is arranged on a connecting pipeline of the high-temperature heat exchanger (13) and the inlet of the high-pressure turbine (2), and a third valve (143) is arranged on a connecting pipeline of the high-temperature heat exchanger (13) and the cold-side inlet split flow of the high-temperature heat regenerator (8).
2. An integrated heat storage supercritical carbon dioxide coal-fired power generation system according to claim 1, further characterized by an auxiliary regenerator (9); when in heat storage, the inlet and the outlet of the hot side of the auxiliary heat regenerator (9) are respectively connected with the outlet of the auxiliary turbine (10) and the inlet of the hot side of the low-temperature heat regenerator (7), and the inlet and the outlet of the cold side of the auxiliary heat regenerator (9) are respectively connected with the diversion pipeline of the inlet of the cold side of the high-temperature heat regenerator (8) and the inlet of the tail part of the boiler (1); the connection relationship at the time of heat release is the same as that at the time of heat storage.
3. An integrated heat storage supercritical carbon dioxide coal fired power generation system as in claim 1 further characterized in that the primary compressor (6) inlet temperature is 32-42 ℃.
4. An integrated heat storage supercritical carbon dioxide coal fired power generation system as in claim 1 further characterized in that the primary compressor (6) inlet pressure is 7.5-9.0MPa.
5. A method of operating an integrated heat storage supercritical carbon dioxide coal fired power generation system as described in any of claims 1-4 comprising a normal mode of operation, a heat storage mode of operation, and a heat release mode of operation:
the normal operation mode is that the valve No. two 142 and the valve No. three 143 are closed, the valve No. one 141 is opened, the high-temperature high-pressure carbon dioxide working medium at the outlet of the boiler (1) firstly enters the high-pressure turbine (2) to do work, the working medium at the outlet of the high-pressure turbine (2) is reheated by the boiler (1) and then enters the low-pressure turbine (3) to do work, and the working medium at the outlet of the low-pressure turbine (3) is divided into two parts after being heated by the high-temperature regenerator (8) and the low-temperature regenerator (7) in sequence: part of the compressed air is boosted by a recompressor (4); the other part is cooled by a cooler (5) and then enters a main compressor (6) for compression and boosting, an outlet working medium of the main compressor (6) enters a low-temperature heat regenerator (7) for heating, and the outlet working medium at the cold side of the low-temperature heat regenerator (7) is split again after being converged with an outlet working medium of a recompression (4): part of the heated water enters the boiler (1) after being heated by the high-temperature heat regenerator (8); the other part of working medium directly enters the tail part of the boiler (1) to absorb the heat of the medium-low temperature flue gas, and two fluids are converged in the boiler;
the heat storage operation mode is based on the conventional operation mode, and the valve number two 142 is opened; the inlet working medium of the high-pressure turbine (2) is shunted out to heat the heat storage material from the heat storage cold tank (12) in the high-temperature heat exchanger (13), and the heat storage material is stored in the heat storage hot tank (11) after being heated to a high-temperature state; the working medium flow of the high-pressure turbine (2) and the low-pressure turbine (3) is reduced through diversion, so that the load of a unit is quickly reduced;
the exothermic mode of operation opens valve number three 143 based on the normal mode of operation; and the flow of the system and the flow of a diversion pipeline at the cold side inlet of the high-temperature heat regenerator (8) are increased, the high-temperature heat storage material stored in the heat storage heat tank (11) is released, carbon dioxide working medium from the diversion pipeline at the cold side inlet of the high-temperature heat regenerator (8) is heated in the high-temperature heat exchanger (13), and the working medium heated at the outlet of the high-temperature heat exchanger (13) enters the auxiliary turbine (10) to perform power generation, so that the load of a unit is rapidly increased.
6. The operation method of an integrated heat storage supercritical carbon dioxide coal-fired power generation system according to claim 5, wherein in a heat storage operation mode, in order to reduce the pressure of a working medium at an outlet of a high-temperature heat exchanger (13), the carbon dioxide working medium at the outlet of the high-temperature heat exchanger (13) enters an auxiliary turbine (10) to expand and do work, and the working medium at the outlet of the auxiliary turbine (10) is converged into a hot side inlet of a low-temperature heat regenerator (7) after being heated in the auxiliary heat regenerator (9) from a cold side inlet of the high-temperature heat regenerator (8).
7. The operation method of the supercritical carbon dioxide coal-fired power generation system integrating heat storage, which is disclosed in claim 5, wherein in a heat release operation mode, an outlet working medium of the auxiliary turbine (10) releases heat in the auxiliary regenerator (9), and a diversion working medium from a cold side inlet of the high-temperature regenerator (8) is heated and finally is converged into a hot side inlet of the low-temperature regenerator (7).
CN202310301713.0A 2023-03-24 2023-03-24 Supercritical carbon dioxide coal-fired power generation system integrating heat storage and operation method Pending CN116464525A (en)

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