CN116207784A - Coal-fired power generation and Carnot battery energy storage coupling system and operation method thereof - Google Patents
Coal-fired power generation and Carnot battery energy storage coupling system and operation method thereof Download PDFInfo
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- 238000010248 power generation Methods 0.000 title claims abstract description 62
- 230000008878 coupling Effects 0.000 title claims abstract description 38
- 238000010168 coupling process Methods 0.000 title claims abstract description 38
- 238000005859 coupling reaction Methods 0.000 title claims abstract description 38
- 238000000034 method Methods 0.000 title claims abstract description 27
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 claims abstract description 154
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- 150000003839 salts Chemical class 0.000 claims description 112
- 238000000605 extraction Methods 0.000 claims description 9
- 235000014698 Brassica juncea var multisecta Nutrition 0.000 claims description 7
- 235000006008 Brassica napus var napus Nutrition 0.000 claims description 7
- 240000000385 Brassica napus var. napus Species 0.000 claims description 7
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- 235000004977 Brassica sinapistrum Nutrition 0.000 claims description 7
- 238000001816 cooling Methods 0.000 claims description 7
- 238000010438 heat treatment Methods 0.000 claims description 7
- 125000004122 cyclic group Chemical group 0.000 claims description 6
- ZUOUZKKEUPVFJK-UHFFFAOYSA-N diphenyl Chemical compound C1=CC=CC=C1C1=CC=CC=C1 ZUOUZKKEUPVFJK-UHFFFAOYSA-N 0.000 claims description 6
- 238000007599 discharging Methods 0.000 claims description 6
- 238000009833 condensation Methods 0.000 claims description 5
- 230000005494 condensation Effects 0.000 claims description 5
- OOYGSFOGFJDDHP-KMCOLRRFSA-N kanamycin A sulfate Chemical group OS(O)(=O)=O.O[C@@H]1[C@@H](O)[C@H](O)[C@@H](CN)O[C@@H]1O[C@H]1[C@H](O)[C@@H](O[C@@H]2[C@@H]([C@@H](N)[C@H](O)[C@@H](CO)O2)O)[C@H](N)C[C@@H]1N OOYGSFOGFJDDHP-KMCOLRRFSA-N 0.000 claims description 4
- 229910013553 LiNO Inorganic materials 0.000 claims description 3
- 235000010290 biphenyl Nutrition 0.000 claims description 3
- 239000004305 biphenyl Substances 0.000 claims description 3
- ZCILODAAHLISPY-UHFFFAOYSA-N biphenyl ether Natural products C1=C(CC=C)C(O)=CC(OC=2C(=CC(CC=C)=CC=2)O)=C1 ZCILODAAHLISPY-UHFFFAOYSA-N 0.000 claims description 3
- 239000003245 coal Substances 0.000 claims description 3
- 238000006073 displacement reaction Methods 0.000 claims description 3
- 239000000374 eutectic mixture Substances 0.000 claims description 3
- 239000008236 heating water Substances 0.000 claims description 3
- 229910052757 nitrogen Inorganic materials 0.000 claims description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N nitrogen Substances N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims description 3
- QJGQUHMNIGDVPM-UHFFFAOYSA-N nitrogen group Chemical group [N] QJGQUHMNIGDVPM-UHFFFAOYSA-N 0.000 claims description 3
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
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- 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
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F22—STEAM GENERATION
- F22B—METHODS OF STEAM GENERATION; STEAM BOILERS
- F22B1/00—Methods of steam generation characterised by form of heating method
- F22B1/22—Methods of steam generation characterised by form of heating method using combustion under pressure substantially exceeding atmospheric pressure
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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
- F22D1/50—Feed-water heaters, i.e. economisers or like preheaters incorporating thermal de-aeration of feed-water
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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
- F28—HEAT EXCHANGE IN GENERAL
- F28B—STEAM OR VAPOUR CONDENSERS
- F28B9/00—Auxiliary systems, arrangements, or devices
- F28B9/08—Auxiliary systems, arrangements, or devices for collecting and removing condensate
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- 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
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J15/00—Systems for storing electric energy
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/002—Flicker reduction, e.g. compensation of flicker introduced by non-linear load
-
- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/24—Arrangements for preventing or reducing oscillations of power in networks
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/28—Arrangements for balancing of the load in a network by storage of energy
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J3/00—Circuit arrangements for ac mains or ac distribution networks
- H02J3/38—Arrangements for parallely feeding a single network by two or more generators, converters or transformers
- H02J3/46—Controlling of the sharing of output between the generators, converters, or transformers
- H02J3/466—Scheduling the operation of the generators, e.g. connecting or disconnecting generators to meet a given demand
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- 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
- F28D20/0034—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material
- F28D2020/0047—Heat storage plants or apparatus in general; Regenerative heat-exchange apparatus not covered by groups F28D17/00 or F28D19/00 using liquid heat storage material using molten salts or liquid metals
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- H—ELECTRICITY
- H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
- H02J—CIRCUIT ARRANGEMENTS OR SYSTEMS FOR SUPPLYING OR DISTRIBUTING ELECTRIC POWER; SYSTEMS FOR STORING ELECTRIC ENERGY
- H02J2300/00—Systems for supplying or distributing electric power characterised by decentralized, dispersed, or local generation
- H02J2300/10—The dispersed energy generation being of fossil origin, e.g. diesel generators
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- Engineering & Computer Science (AREA)
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- Thermal Sciences (AREA)
- Chemical & Material Sciences (AREA)
- Combustion & Propulsion (AREA)
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Abstract
The invention discloses a coal-fired power generation and carnot battery energy storage coupling system and an operation method thereof, and relates to the technical field of coal-fired power generation and thermal energy storage; the system comprises a coal-fired power generation coupling storage tank system, a Carnot battery energy storage system and a Carnot battery energy release system; when electricity is used in a valley, the existing load of the coal-fired generator set is kept unchanged, redundant electric energy is input into a Carnot battery energy storage system through a motor, and finally the electric energy is converted into heat energy of a heat storage medium to be stored in different storage tanks; when electricity consumption is high, the boiler heat load is unchanged, the bypass feed water, the newly added feed water and the condensed water are heated by the heat of the storage tank, the output of the unit is improved, meanwhile, the Carnot battery energy release system also utilizes the heat of the storage tank to generate partial electric energy, and finally, the electric energy is combined to meet the electric load demand. The system can expand the variable load interval, can ensure the high efficiency of the variable load process, achieves the aims of high efficiency and flexible coordination, and is an effective method for absorbing new energy and stabilizing the fluctuation of the power grid.
Description
Technical Field
The invention relates to the technical field of coal-fired power generation and energy storage, in particular to a coal-fired power generation and canola battery energy storage coupling system and an operation method thereof.
Background
The construction of a clean low-carbon, safe and efficient energy system is quickened in China, and the renewable energy duty ratio is gradually increased. However, most of renewable energy sources such as wind energy, solar energy and the like have intermittence and volatility, large-scale grid connection brings great impact to the safety and stability of a power system, so that the renewable energy sources in China are difficult to generate and consume, and the problems of wind abandoning and light abandoning in partial areas are serious. The coal-fired power generator set is gradually changed from a main power supply to a supporting power supply and a regulating power supply, and is charged with more peak regulation and frequency modulation services, so that the set is in a load-changing transient process for a long time, and how to realize efficient and flexible coordination in the load-changing process is a key core problem to be solved urgently in the development of the power industry in China. The application of the thermal energy storage technology can effectively support innovation and breakthrough of the coal-fired power generation technology, and the Carnot battery energy storage technology adopts heat pump circulation and power circulation to realize electric energy value-added heating and thermoelectric conversion respectively, so that the thermal energy storage technology is a potential efficient large-scale thermal energy storage technology. The combination of the coal-fired power generation and the Carnot battery energy storage technology is expected to realize high-efficiency and flexible coordination in the load-changing process. However, there is currently a lack of design and operational control methods for the configuration of the coal-fired power generation and canola battery energy storage coupling system.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a coal-fired power generation and Carnot battery energy storage coupling system and an operation method thereof.
In order to achieve the above purpose, the invention adopts the following technical scheme:
the coupling system is characterized by comprising a coal-fired power generation coupling storage tank system, a Carnot battery energy storage system and a Carnot battery energy release system; wherein,,
the coal-fired power generation coupling storage tank system comprises a boiler 1, a high-pressure cylinder 2, a middle-low pressure cylinder 3, a coal-fired power generator 4, a condenser 5, a low-pressure heater 6, a deaerator 7, a high-pressure heater 8, a molten salt storage tank 9, a heat conduction oil storage tank 10, a cold water storage tank 11, a multi-stage molten salt heat exchanger 12, a heat conduction oil-water heat exchanger 13, a condensate pump 14, a water supply pump 15, a No. 1 molten salt pump 16, a No. 1 heat conduction oil pump 17, a No. 1 water pump 18, a first valve 19, a second valve 20, a third valve 21, a fourth valve 22, a fifth valve 23, a sixth valve 24 and a seventh valve 25; in the coal-fired power generation coupling storage tank system, water enters a boiler 1, main steam is generated and then enters a high-pressure cylinder 2, partial middle steam extraction of the high-pressure cylinder 2 is used for heating water of a high-pressure heater 8, steam exhausted by the high-pressure cylinder 2 is returned to the boiler 1 again for heating, reheat steam is generated and then enters a middle-low pressure cylinder 3, and partial middle steam extraction of the middle-low pressure cylinder 3 is used for heating condensation water in a deaerator 7 and a low-pressure heater 6; the high-pressure cylinder 2 and the middle-low pressure cylinder 3 are coaxially connected, the generated mechanical energy is transmitted to the coal-fired generator 4, and the generated electric energy is output outwards; the drain steam of the low-pressure heater 6 and the drain steam of the middle-low pressure cylinder 3 are combined into a condenser 5, condensation is carried out to generate condensate, after passing through a condensate pump 14, one part of condensate enters the low-pressure heater 6 through a second valve 20, the other part of condensate enters a heat conduction oil-water heat exchanger 13 through a first valve 19, then two parts of condensate and the drain steam from the high-pressure heater 8 are combined together to enter a deaerator 7, after saturated water supply is generated, the water supply pump 15 is carried out, one part of water supply enters the high-pressure heater 8 through a fourth valve 22 and finally enters the boiler 1, the other part of water supply passes through a third valve 21, a multistage molten salt heat exchanger 12 and a fifth valve 23, after new steam is generated, the water supply is combined with main steam from the boiler 1, and then enters the high-pressure cylinder 2, and the process is repeated; meanwhile, medium-temperature molten salt enters a molten salt storage tank 9 through a No. 1 molten salt pump 16, and molten salt at an outlet of the molten salt storage tank 9 enters a multistage molten salt heat exchanger 12 after passing through a sixth valve 24; the low-temperature heat conduction oil enters the heat conduction oil storage tank 10 through the No. 1 heat conduction oil pump 17, and the heat conduction oil at the outlet of the heat conduction oil storage tank 10 enters the heat conduction oil-water heat exchanger 13 after passing through the seventh valve 25; the water enters a cold water storage tank 11 after passing through a No. 1 water pump 18, and the generated low-temperature cold water enters a condenser 5;
the Carnot battery energy storage system comprises a motor 30, a multistage charging compressor 31, a molten salt-working medium heat exchanger 32, a heat conduction oil-working medium heat exchanger 33, a charging expander 34, a water-working medium heat exchanger 35, a No. 2 molten salt pump 36, a No. 2 heat conduction oil pump 37 and a No. 2 water pump 38; in the carnot battery energy storage system, external input electricity generates mechanical energy in the motor 30 to drive the multi-stage charging compressor 31 to work, and after passing through the multi-stage charging compressor 31, normal-temperature low-pressure working medium generates high-temperature high-pressure working medium and then enters the molten salt-working medium heat exchanger 32 and the heat conduction oil-working medium heat exchanger 33, the low-temperature high-pressure working medium at the outlet of the heat conduction oil-working medium heat exchanger 33 continuously acts in the charging expander 34 to generate low-temperature low-pressure working medium, absorbs heat in the water-working medium heat exchanger 35 and finally returns to the normal-temperature low-pressure working medium, and the process is repeated; meanwhile, the medium-temperature molten salt sequentially passes through a No. 2 molten salt pump 36 and a molten salt-working medium heat exchanger 32 and then enters a molten salt storage tank 9 to form high-temperature molten salt; the low-temperature heat conduction oil sequentially passes through a No. 2 heat conduction oil pump 37 and a heat conduction oil-working medium heat exchanger 33 and then enters a heat conduction oil storage tank 10 to form medium-temperature heat conduction oil; the low-temperature water sequentially passes through a No. 2 water pump 38 and a water-working medium heat exchanger 35 and then enters a cold water storage tank 11 to form low-temperature cold water;
the Carnot battery energy release system comprises a molten salt storage tank 9, a heat conduction oil storage tank 10, a cold water storage tank 11, a molten salt-working medium heat exchanger 32, a heat conduction oil-working medium heat exchanger 33, a water-working medium heat exchanger 35, a discharge compressor 39, a multi-stage discharge expander 40, a Carnot battery generator 41, a 3# molten salt pump 42, a 3# heat conduction oil pump 43, a 3# water pump 44 and an auxiliary heat exchanger 45; in the carnot battery energy release system, a low-temperature low-pressure working medium generates a normal-temperature high-pressure working medium after passing through a discharge compressor 39, then sequentially passes through a heat conduction oil-working medium heat exchanger 33 and a molten salt-working medium heat exchanger 32 to generate a high-temperature high-pressure working medium, then works in a multi-stage discharge expander 40, and generates mechanical energy which is converted into electric energy in a carnot battery generator 41 and is output outwards; the normal-temperature low-pressure working medium passing through the multistage discharge expander 40 releases heat in the auxiliary heat exchanger 45, then enters the water-working medium heat exchanger 35, finally returns to the low-temperature low-pressure working medium, and the process is repeated; meanwhile, the high-temperature molten salt sequentially passes through a 3# molten salt pump 42 and a molten salt-working medium heat exchanger 32 and then enters a molten salt storage tank 9 to form medium-temperature molten salt; the medium-temperature heat conduction oil sequentially passes through the 3# heat conduction oil pump 43 and the heat conduction oil-working medium heat exchanger 33 and then enters the heat conduction oil storage tank 10 to form low-temperature heat conduction oil; the low-temperature cold water sequentially passes through the No. 3 water pump 44 and the water-working medium heat exchanger 35 and then enters the cold water storage tank 11 to form the low-temperature water.
Further, the molten salt storage tank 9 adopts ternary molten salt, namely LiNO with the mass percentage of 30 percent 3 18% NaNO 3 And 52% KNO 3 As a heat storage medium, the operation temperature interval is 130-550 ℃; the heat conduction oil storage tank 10 adopts a eutectic mixture, namely biphenyl with the mass percentage of 26.5 percent and biphenyl ether with the mass percentage of 73.5 percent as heat storage media, and the operation temperature interval is 25-170 ℃; the cold water storage tank 11 adopts normal pressure water as a heat storage medium, and the working temperature is 10-45 ℃.
Further, the cyclic working medium adopted by the carnot battery energy storage system and the carnot battery energy release system is nitrogen, the cyclic mode adopts Brayton cycle, the highest working temperature is 550 ℃, and the lowest working temperature is 5 ℃.
Further, the multi-stage charging compressor 31 is at least composed of four stages of compressors, and adopts a centrifugal compressor, and the comprehensive pressure ratio of the inlet and the outlet reaches 10.5; the multistage discharge expander 40 is composed of at least three stages of expanders, and adopts an axial-flow expander, and the inlet-outlet expansion ratio reaches 7.8.
Further, the motor 30, the multi-stage charge compressor 31 and the charge expander 34 are coaxially connected; the discharge compressor 39, the multi-stage discharge expander 40 and the carnot generator 41 are coaxially connected.
Further, the molten salt storage tank 9, the heat conducting oil storage tank 10 and the cold water storage tank 11 are all inclined temperature layer storage tanks, the upper part of each storage tank is provided with a high-temperature medium, and the lower part of each storage tank is provided with a low-temperature medium; while the three reservoirs each include two inlets and two outlets.
Further, the multi-stage molten salt heat exchanger 12 includes three stages, a molten salt-feedwater heater, a molten salt-steam generator, and a molten salt-steam heater, respectively.
The operation method of the coal-fired power generation and Carnot battery energy storage coupling system is characterized by comprising the following steps of:
1) When the coal-fired power generator unit is in a low electricity consumption valley, the coal-fired power generator unit keeps the existing load to work, a storage tank system coupled with the coal-fired power generator unit temporarily stops working, most of electric energy output by the coal-fired power generator unit through the coal-fired power generator 4 is used as an input source of a motor 30 in the Kano battery energy storage system, and the Kano battery energy storage system is used for converting redundant electric energy into heat energy for storage; specifically, a third valve 21 and a fifth valve 23 of the water supply bypass entering the branch of the multistage molten salt heat exchanger 12 are closed, the No. 1 molten salt pump 16 is stopped, and a sixth valve 24 of the molten salt entering the branch of the multistage molten salt heat exchanger 12 is closed; closing a first valve 19 on a branch of the condensed water entering the heat conduction oil-water heat exchanger 13, stopping the 1# heat conduction oil pump 17, and closing a seventh valve 25 on a branch of the heat conduction oil entering the heat conduction oil-water heat exchanger 13; the amount of the coal entering the coal-fired power generation unit boiler 1 is not changed, the working condition of the steam turbine only fluctuates slightly, and then the steam turbine is maintained in a high-load working condition, so that higher power generation efficiency is ensured, the exhaust steam of the coal-fired power generation unit is not cooled by a cooling tower any more, and is cooled by cold water generated by a Carnot battery energy storage system; the motor 30 in the Carnot battery energy storage system drives the multistage charging compressor 31 to work, redundant electric energy of the coal-fired power generation and Carnot battery energy storage coupling system is converted into heat energy of three heat storage mediums, and the heat energy is finally stored in the molten salt storage tank 9, the heat conduction oil storage tank 10 and the cold water storage tank 11 respectively;
2) When the coal-fired power generation coupling storage tank system and the Carnot battery energy release system work normally in the electricity consumption peak, a water supply bypass is opened to enter a third valve 21 and a fifth valve 23 on a branch of the multi-stage molten salt heat exchanger 12, a No. 1 molten salt pump 16 is started, molten salt enters a sixth valve 24 on the branch of the multi-stage molten salt heat exchanger 12, at the moment, the water supply quantity of the coal-fired power generator set entering the high-pressure heater 8 is reduced, the displacement steam extraction returns to the high-pressure cylinder 2 to do work further, the output of a steam turbine is increased, the water supply quantity entering the boiler 1 is not changed, the power of the water supply pump 15 is increased, the water supply quantity increasing part is heated through the multi-stage molten salt heat exchanger 12, the generated new steam and the steam at the outlet of the boiler 1 are mixed to enter the steam turbine to do work, and the generated energy of the steam turbine is obviously increased; opening a first valve 19 on a branch of the condensed water entering the heat conduction oil-water heat exchanger 13, starting a No. 1 heat conduction oil pump 17, opening a seventh valve 25 on a branch of the heat conduction oil entering the heat conduction oil-water heat exchanger 13, reducing the condensed water quantity of the coal-fired generator set entering the low-pressure heater 6 at the moment, and exhausting and extracting steam to return to the middle-low pressure cylinder 3 for further work, so as to increase the output of the steam turbine; the exhaust steam of the coal-fired generator set is not cooled by a cooling tower any more, but is directly cooled by cold water generated by a Carnot battery energy storage system; the discharging compressor 39 is utilized to pressurize the working medium in the carnot battery energy release system, and then the working medium respectively absorbs the heat of the heat storage medium in the heat conduction oil storage tank 10 and the molten salt storage tank 9 in the heat conduction oil-working medium heat exchanger 33 and the molten salt-working medium heat exchanger 32 to generate high-temperature and high-pressure working medium, work is done in the multi-stage discharging expander 40, and the generated mechanical energy is converted into electric energy in the carnot battery generator 41 and is output outwards, and the electric energy is added with the electric energy of the coal-fired generator 4 to meet the electric load requirement.
Further, when the carnot battery energy storage system is operated, the operation time of the molten salt storage tank 9, the heat conduction oil storage tank 10 and the cold water storage tank 11 is 10 hours; when the carnot battery energy release system is operated, the operation time of the molten salt storage tank 9, the heat conducting oil storage tank 10 and the cold water storage tank 11 is 5.5 hours.
Further, when the system is in a power consumption peak, in order to meet the requirement that the coal-fired power generation and the Carnot battery energy storage coupling system have higher efficiency, 56% of the heat stored in the molten salt storage tank 9 is used for a coal-fired power generation set, and 44% is used for a Carnot battery energy release system; 68% of the heat stored in the conduction oil storage tank 10 is used for a coal-fired power generation unit, and 32% is used for a Carnot battery energy release system; 81% of the cold energy stored in the cold water storage tank 11 is used for the coal-fired power generation unit, and 19% is used for the Carnot battery energy release system.
Compared with the prior art, the invention has the following advantages:
(1) Because the Carnot battery energy storage system is adopted to consume redundant electric energy of the power grid, the coal-fired power generator set can always be operated at higher load in the load changing process, and the operation parameters of all equipment of the set are near the design value, so that the high efficiency of the coal-fired power generator set is ensured;
(2) The load lifting interval can be greatly expanded through the integration of coal-fired power generation and Carnot battery energy storage, and the peak shaving depth is improved;
(3) The cold end of the coal-fired power generating unit is cooled by adopting low-temperature water in the cold water storage tank, so that the investment of a cooling tower or an air cooling island is reduced, the technical economy is more dominant, and the coal-fired power generating unit is not limited by regions.
Drawings
FIG. 1 is a schematic diagram of a coal-fired power generation system and a Carnot battery energy storage system and modes of operation during low power consumption.
FIG. 2 is a schematic diagram of a coal-fired power generation system and a Carnot battery energy release system and modes of operation during peak power utilization.
Detailed Description
The invention will now be described in further detail with reference to the drawings and the detailed description, it being understood that the preferred embodiments described herein are for illustration and explanation only and are not intended to limit the invention thereto.
As shown in fig. 1 and 2, the invention provides a coal-fired power generation and carnot battery energy storage coupling system, which comprises a coal-fired power generation coupling storage tank system, a carnot battery energy storage system and a carnot battery energy release system; wherein,,
in the coal-fired power generation coupling storage tank system, water enters a boiler 1, main steam is generated and then enters a high-pressure cylinder 2, partial middle steam extraction of the high-pressure cylinder 2 is used for heating water of a high-pressure heater 8, steam exhausted by the high-pressure cylinder 2 is returned to the boiler 1 again for heating, reheat steam is generated and then enters a middle-low pressure cylinder 3, and partial middle steam extraction of the middle-low pressure cylinder 3 is used for heating condensation water in a deaerator 7 and a low-pressure heater 6; the high-pressure cylinder 2 and the middle-low pressure cylinder 3 are coaxially connected, the generated mechanical energy is transmitted to the coal-fired generator 4, and the generated electric energy is output outwards; the drain steam of the low-pressure heater 6 and the drain steam of the middle-low pressure cylinder 3 are combined into a condenser 5, condensation is carried out to generate condensate, after passing through a condensate pump 14, one part of condensate enters the low-pressure heater 6 through a second valve 20, the other part of condensate enters a heat conduction oil-water heat exchanger 13 through a first valve 19, then two parts of condensate and the drain steam from the high-pressure heater 8 are combined together to enter a deaerator 7, after saturated water supply is generated, the water supply pump 15 is carried out, one part of water supply enters the high-pressure heater 8 through a fourth valve 22 and finally enters the boiler 1, the other part of water supply passes through a third valve 21, a multistage molten salt heat exchanger 12 and a fifth valve 23, after new steam is generated, the water supply is combined with main steam from the boiler 1, and then enters the high-pressure cylinder 2, and the process is repeated; meanwhile, medium-temperature molten salt enters a molten salt storage tank 9 through a No. 1 molten salt pump 16, and molten salt at an outlet of the molten salt storage tank 9 enters a multistage molten salt heat exchanger 12 after passing through a sixth valve 24; the low-temperature heat conduction oil enters the heat conduction oil storage tank 10 through the No. 1 heat conduction oil pump 17, and the heat conduction oil at the outlet of the heat conduction oil storage tank 10 enters the heat conduction oil-water heat exchanger 13 after passing through the seventh valve 25; the water enters a cold water storage tank 11 after passing through a No. 1 water pump 18, and the generated low-temperature cold water enters a condenser 5;
in the carnot battery energy storage system, external input electricity generates mechanical energy in the motor 30 to drive the multi-stage charging compressor 31 to work, and after passing through the multi-stage charging compressor 31, normal-temperature low-pressure working medium generates high-temperature high-pressure working medium and then enters the molten salt-working medium heat exchanger 32 and the heat conduction oil-working medium heat exchanger 33, the low-temperature high-pressure working medium at the outlet of the heat conduction oil-working medium heat exchanger 33 continuously acts in the charging expander 34 to generate low-temperature low-pressure working medium, absorbs heat in the water-working medium heat exchanger 35 and finally returns to the normal-temperature low-pressure working medium, and the process is repeated; meanwhile, the medium-temperature molten salt sequentially passes through a No. 2 molten salt pump 36 and a molten salt-working medium heat exchanger 32 and then enters a molten salt storage tank 9 to form high-temperature molten salt; the low-temperature heat conduction oil sequentially passes through a No. 2 heat conduction oil pump 37 and a heat conduction oil-working medium heat exchanger 33 and then enters a heat conduction oil storage tank 10 to form medium-temperature heat conduction oil; the low-temperature water sequentially passes through a No. 2 water pump 38 and a water-working medium heat exchanger 35 and then enters a cold water storage tank 11 to form low-temperature cold water;
in the carnot battery energy release system, a low-temperature low-pressure working medium generates a normal-temperature high-pressure working medium after passing through a discharge compressor 39, then sequentially passes through a heat conduction oil-working medium heat exchanger 33 and a molten salt-working medium heat exchanger 32 to generate a high-temperature high-pressure working medium, then works in a multi-stage discharge expander 40, and generates mechanical energy which is converted into electric energy in a carnot battery generator 41 and is output outwards; the normal-temperature low-pressure working medium passing through the multistage discharge expander 40 releases heat in the auxiliary heat exchanger 45, then enters the water-working medium heat exchanger 35, finally returns to the low-temperature low-pressure working medium, and the process is repeated; meanwhile, the high-temperature molten salt sequentially passes through a 3# molten salt pump 42 and a molten salt-working medium heat exchanger 32 and then enters a molten salt storage tank 9 to form medium-temperature molten salt; the medium-temperature heat conduction oil sequentially passes through the 3# heat conduction oil pump 43 and the heat conduction oil-working medium heat exchanger 33 and then enters the heat conduction oil storage tank 10 to form low-temperature heat conduction oil; the low-temperature cold water sequentially passes through the No. 3 water pump 44 and the water-working medium heat exchanger 35 and then enters the cold water storage tank 11 to form the low-temperature water.
Further, the molten salt storage tank 9 adopts ternary molten salt (mass percent of 30% LiNO 3 +18％NaNO 3 +52％KNO 3 ) As a heat storage medium, the operation temperature interval is 130-550 ℃; the heat conduction oil storage tank 10 adopts eutectic mixture (biphenyl with the mass percentage of 26.5 percent and biphenyl ether with the mass percentage of 73.5 percent) as a heat storage medium, and the operation temperature range is 25-170 ℃; the cold water storage tank 11 adopts normal pressure water as a heat storage medium, and the working temperature is 10-45 ℃. Therefore, the temperature zone characteristics of the heat storage medium can be fully utilized, the initial temperature can be increased as much as possible, and the comprehensive electric efficiency can be further improved.
Further, the cyclic working medium adopted by the carnot battery energy storage system and the carnot battery energy release system is nitrogen, the cyclic mode adopts Brayton cycle, the highest working temperature is 550 ℃, and the lowest working temperature is 5 ℃. Therefore, the heat storage temperature areas of different heat storage media can be fully utilized, the temperature area matching of the circulating working medium and the heat storage media can be realized, and the heat exchanger has the highest energy efficiency.
Further, the multi-stage charging compressor 31 is at least composed of four stages of compressors, and a centrifugal compressor is adopted, so that the comprehensive pressure ratio of an inlet and an outlet can reach 10.5; the multistage discharge expander 40 is composed of at least three stages of expanders, and an inlet-outlet expansion ratio can reach 7.8 by adopting an axial-flow expander. In this way, the efficiency of the canola battery energy storage system and the canola battery energy release system may be maximized.
Further, the motor 30, the multi-stage charge compressor 31 and the charge expander 34 are coaxially connected; the discharge compressor 39, the multi-stage discharge expander 40 and the carnot generator 41 are coaxially connected. Therefore, the energy storage system of the Carnot battery can be ensured to directly obtain the net input electric energy from the outside, and the energy release system of the Carnot battery can directly export the net output electric energy to the outside.
Further, the molten salt storage tank 9, the heat conducting oil storage tank 10 and the cold water storage tank 11 are all inclined temperature layer storage tanks, the upper part of each storage tank is provided with a high-temperature medium, and the lower part of each storage tank is provided with a low-temperature medium; while three reservoirs all need to include two inlets and two outlets. Therefore, the independent operation of the energy storage system of the Carnot battery and the energy release system of the Carnot battery can be ensured, and the interference is avoided.
Further, the multi-stage molten salt heat exchanger 12 includes three stages, a molten salt-feedwater heater, a molten salt-steam generator, and a molten salt-steam heater, respectively. Therefore, the single-phase and phase-change process of steam generated by water supply can be effectively matched, and the energy efficiency of the heat exchanger is improved.
The operation method of the coal-fired power generation and Carnot battery energy storage coupling system comprises 1) when the coal-fired power generation system is in a low electricity consumption valley, the coal-fired power generation unit keeps the existing load to work, a coupled storage tank system temporarily stops working, most of electric energy output by the coal-fired power generation unit through the coal-fired power generator 4 is used as an input source of a motor 30 in the Carnot battery energy storage system, and the Carnot battery energy storage system is used for converting redundant electric energy into heat energy for storage; specifically, a third valve 21 and a fifth valve 23 of the water supply bypass entering the branch of the multistage molten salt heat exchanger 12 are closed, the No. 1 molten salt pump 16 is stopped, and a sixth valve 24 of the molten salt entering the branch of the multistage molten salt heat exchanger 12 is closed; closing a first valve 19 on a branch of the condensed water entering the heat conduction oil-water heat exchanger 13, stopping the 1# heat conduction oil pump 17, and closing a seventh valve 25 on a branch of the heat conduction oil entering the heat conduction oil-water heat exchanger 13; the amount of the coal entering the coal-fired power generation unit boiler 1 is not changed, the working condition of the steam turbine only fluctuates slightly, and then the steam turbine is maintained in a high-load working condition, so that higher power generation efficiency is ensured, the exhaust steam of the coal-fired power generation unit is not cooled by a cooling tower any more, and is cooled by cold water generated by a Carnot battery energy storage system; the motor 30 in the Carnot battery energy storage system drives the multistage charging compressor 31 to work, redundant electric energy of the coal-fired power generation and Carnot battery energy storage coupling system is converted into heat energy of three heat storage mediums, and the heat energy is finally stored in the molten salt storage tank 9, the heat conduction oil storage tank 10 and the cold water storage tank 11 respectively;
2) When the coal-fired power generation coupling storage tank system and the Carnot battery energy release system work normally in the power consumption peak, a water supply bypass is opened to enter a third valve 21 and a fifth valve 23 on a branch of the multi-stage molten salt heat exchanger 12, a No. 1 molten salt pump 16 is started, molten salt enters a sixth valve 24 on the branch of the multi-stage molten salt heat exchanger 12, at the moment, the water supply quantity of the coal-fired power generator set entering the high-pressure heater 8 is reduced, the displacement steam extraction returns to the high-pressure cylinder 2 to do further work, the output of a steam turbine is increased, the water supply quantity entering the boiler 1 is not changed, the power of the water supply pump 15 is increased, the increased part of the water supply quantity is heated through the multi-stage molten salt heat exchanger 12, and the generated new steam and the steam at the outlet of the boiler 1 are mixed to enter the steam turbine to do work, so that the power generation quantity of the steam turbine can be remarkably increased; opening a first valve 19 on a branch of the condensed water entering the heat conduction oil-water heat exchanger 13, starting a No. 1 heat conduction oil pump 17, opening a seventh valve 25 on a branch of the heat conduction oil entering the heat conduction oil-water heat exchanger 13, reducing the condensed water quantity of the coal-fired generator set entering the low-pressure heater 6 at the moment, and exhausting and extracting steam to return to the middle-low pressure cylinder 3 for further work, so as to increase the output of the steam turbine; the exhaust steam of the coal-fired generator set is not cooled by a cooling tower any more, but is directly cooled by cold water generated by a Carnot battery energy storage system; the discharging compressor 39 is utilized to pressurize the working medium in the carnot battery energy release system, and then the working medium respectively absorbs the heat of the heat storage medium in the heat conduction oil storage tank 10 and the molten salt storage tank 9 in the heat conduction oil-working medium heat exchanger 33 and the molten salt-working medium heat exchanger 32 to generate high-temperature and high-pressure working medium, work is done in the multi-stage discharging expander 40, and the generated mechanical energy is converted into electric energy in the carnot battery generator 41 and is output outwards, and the electric energy is added with the electric energy of the coal-fired generator 4 to meet the electric load requirement.
Further, when the carnot battery energy storage system is operated, the operation time of the molten salt storage tank 9, the heat conduction oil storage tank 10 and the cold water storage tank 11 is 10 hours; when the carnot battery energy release system is operated, the operation time of the molten salt storage tank 9, the heat conducting oil storage tank 10 and the cold water storage tank 11 is 5.5 hours. In this way, it is ensured that the heat stored in the molten salt storage tank 9, the heat conducting oil storage tank 10 and the cold water storage tank 11 is sufficient for the carnot battery energy release system to use in one heat storage-release period, and different rate requirements can be met.
Further, when the system is in a power consumption peak, in order to meet the requirement that the coal-fired power generation and the Carnot battery energy storage coupling system have higher efficiency, 56% of the heat stored in the molten salt storage tank 9 is used for a coal-fired power generation set, and 44% is used for a Carnot battery energy release system; 68% of the heat stored in the conduction oil storage tank 10 is used for a coal-fired power generation unit, and 32% is used for a Carnot battery energy release system; 81% of the cold energy stored in the cold water storage tank 11 is used for the coal-fired power generation unit, and 19% is used for the Carnot battery energy release system.
Claims (10)
1. The coupling system is characterized by comprising a coal-fired power generation coupling storage tank system, a Carnot battery energy storage system and a Carnot battery energy release system; wherein,,
the coal-fired power generation coupling storage tank system comprises a boiler (1), a high-pressure cylinder (2), a middle-low pressure cylinder (3), a coal-fired generator (4), a condenser (5), a low-pressure heater (6), a deaerator (7), a high-pressure heater (8), a molten salt storage tank (9), a heat conduction oil storage tank (10), a cold water storage tank (11), a multi-stage molten salt heat exchanger (12), a heat conduction oil-water heat exchanger (13), a condensate pump (14), a water supply pump (15), a No. 1 molten salt pump (16), a No. 1 heat conduction oil pump (17), a No. 1 water pump (18), a first valve (19), a second valve (20), a third valve (21), a fourth valve (22), a fifth valve (23), a sixth valve (24) and a seventh valve (25); in the coal-fired power generation coupling storage tank system, water enters a boiler (1), main steam is generated and then enters a high-pressure cylinder (2), partial middle steam extraction of the high-pressure cylinder (2) is used for heating water of a high-pressure heater (8), steam exhaust of the high-pressure cylinder (2) returns to the boiler (1) again for heating, reheat steam is generated and then enters a middle-low pressure cylinder (3), and partial middle steam extraction of the middle-low pressure cylinder (3) is used for heating condensate water in a deaerator (7) and a low-pressure heater (6); the high-pressure cylinder (2) is coaxially connected with the middle-low pressure cylinder (3), and the generated mechanical energy is transmitted to the coal-fired generator (4) to generate electric energy for output; the drainage of the low-pressure heater (6) and the drainage of the medium-low pressure cylinder (3) are combined into a condenser (5), condensation is carried out to generate condensed water, after passing through a condensed water pump (14), one part of condensed water enters the low-pressure heater (6) through a second valve (20), the other part of condensed water enters a heat conduction oil-water heat exchanger (13) through a first valve (19), then the two parts of condensed water and the drainage from the high-pressure heater (8) are combined together to enter a deaerator (7), saturated water is generated, after passing through a water feeding pump (15), one part of water enters the high-pressure heater (8) through a fourth valve (22), finally enters the boiler (1), the other part of water passes through a third valve (21), a multi-stage molten salt heat exchanger (12) and a fifth valve (23), new steam is generated, and then the water is combined with main steam from the boiler (1), and the process is repeated; meanwhile, medium-temperature molten salt enters a molten salt storage tank (9) through a No. 1 molten salt pump (16), and molten salt at the outlet of the molten salt storage tank (9) enters a multistage molten salt heat exchanger (12) after passing through a sixth valve (24); the low-temperature heat conduction oil enters a heat conduction oil storage tank (10) through a No. 1 heat conduction oil pump (17), and heat conduction oil at an outlet of the heat conduction oil storage tank (10) enters a heat conduction oil-water heat exchanger (13) after passing through a seventh valve (25); the water enters a cold water storage tank (11) after passing through a No. 1 water pump (18), and the generated low-temperature cold water enters a condenser (5);
the Carnot battery energy storage system comprises a motor (30), a multistage charging compressor (31), a molten salt-working medium heat exchanger (32), a heat conduction oil-working medium heat exchanger (33), a charging expander (34), a water-working medium heat exchanger (35), a No. 2 molten salt pump (36), a No. 2 heat conduction oil pump (37) and a No. 2 water pump (38); in the Carnot battery energy storage system, external input electricity generates mechanical energy in a motor (30) to drive a multi-stage charging compressor (31) to work, a normal-temperature low-pressure working medium passes through the multi-stage charging compressor (31) to generate a high-temperature high-pressure working medium, then the working medium enters a molten salt-working medium heat exchanger (32) and a heat conduction oil-working medium heat exchanger (33), the low-temperature high-pressure working medium at the outlet of the heat conduction oil-working medium heat exchanger (33) continuously acts in a charging expander (34) to generate a low-temperature low-pressure working medium, absorbs heat in a water-working medium heat exchanger (35) and finally returns to the normal-temperature low-pressure working medium, and the process is repeated; meanwhile, the medium-temperature molten salt sequentially passes through a No. 2 molten salt pump (36) and a molten salt-working medium heat exchanger (32) and then enters a molten salt storage tank (9) to form high-temperature molten salt; the low-temperature heat conduction oil sequentially passes through a No. 2 heat conduction oil pump (37) and a heat conduction oil-working medium heat exchanger (33) and then enters a heat conduction oil storage tank (10) to form medium-temperature heat conduction oil; the low-temperature water sequentially passes through a No. 2 water pump (38) and a water-working medium heat exchanger (35) and then enters a cold water storage tank (11) to form low-temperature cold water;
the Carnot battery energy release system comprises a molten salt storage tank (9), a heat conducting oil storage tank (10), a cold water storage tank (11), a molten salt-working medium heat exchanger (32), a heat conducting oil-working medium heat exchanger (33), a water-working medium heat exchanger (35), a discharge compressor (39), a multistage discharge expander (40), a Carnot battery generator (41), a 3# molten salt pump (42), a 3# heat conducting oil pump (43), a 3# water pump (44) and an auxiliary heat exchanger (45); in the carnot battery energy release system, a low-temperature low-pressure working medium generates a normal-temperature high-pressure working medium after passing through a discharge compressor (39), then sequentially passes through a heat conduction oil-working medium heat exchanger (33) and a molten salt-working medium heat exchanger (32) to generate a high-temperature high-pressure working medium, then works in a multistage discharge expander (40), and generates mechanical energy which is converted into electric energy in a carnot battery generator (41) and is output outwards; the normal-temperature low-pressure working medium after passing through the multistage discharge expander (40) releases heat in the auxiliary heat exchanger (45), then enters the water-working medium heat exchanger (35), finally returns to the low-temperature low-pressure working medium, and the process is repeated; meanwhile, the high-temperature molten salt sequentially passes through a 3# molten salt pump (42) and a molten salt-working medium heat exchanger (32) and then enters a molten salt storage tank (9) to form medium-temperature molten salt; the medium-temperature heat conduction oil sequentially passes through a 3# heat conduction oil pump (43) and a heat conduction oil-working medium heat exchanger (33) and then enters a heat conduction oil storage tank (10) to form low-temperature heat conduction oil; the low-temperature cold water sequentially passes through a No. 3 water pump (44) and a water-working medium heat exchanger (35) and then enters a cold water storage tank (11) to form the low-temperature water.
2. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the molten salt storage tank (9) adopts ternary molten salt, namely LiNO with mass percent of 0 percent 3 18% NaNO 3 And 52% KNO 3 As a heat storage medium, the operation temperature interval is 130-550 ℃; the heat conducting oil storage tank (10) adopts a eutectic mixture, namely biphenyl with the mass percentage of 26.5 percent and biphenyl ether with the mass percentage of 73.5 percent, as a heat storage medium, and the operation temperature interval is 25-170 ℃; the cold water storage tank (11) adopts normal pressure water as a heat storage medium, and the working temperature is 10-45 ℃.
3. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the cyclic working medium adopted by the carnot battery energy storage system and the carnot battery energy release system is nitrogen, the cyclic mode adopts Brayton cycle, the highest working temperature is 550 ℃, and the lowest working temperature is 5 ℃.
4. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the multistage charging compressor (31) at least comprises four stages of compressors, adopts a centrifugal compressor, and has an inlet and outlet comprehensive pressure ratio of 10.5; the multistage discharge expander (40) at least comprises three stages of expanders, and an axial-flow expander is adopted, so that the inlet-outlet expansion ratio reaches 7.8.
5. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the motor (30), the multi-stage charging compressor (31) and the charging expander (34) are coaxially connected; the discharge compressor (39), the multistage discharge expander (40) and the Carnot battery generator (41) are coaxially connected.
6. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the molten salt storage tank (9), the heat conducting oil storage tank (10) and the cold water storage tank (11) are all inclined temperature layer storage tanks, the upper part of each storage tank is provided with a high-temperature medium, and the lower part of each storage tank is provided with a low-temperature medium; while the three reservoirs each include two inlets and two outlets.
7. The coal-fired power generation and carnot battery energy storage coupling system according to claim 1, wherein: the multi-stage molten salt heat exchanger (12) includes three stages, a molten salt-feedwater heater, a molten salt-steam generator, and a molten salt-steam heater, respectively.
8. A method of operating a coal-fired power generation and canola battery energy storage coupling system as claimed in any one of claims 1 to 7, wherein:
1) When the coal-fired power generator unit is in a low electricity consumption valley, the coal-fired power generator unit keeps the existing load to work, a storage tank system coupled with the coal-fired power generator unit temporarily stops working, most of electric energy output by the coal-fired power generator unit through a coal-fired power generator (4) is used as an input source of a motor (30) in the Kano battery energy storage system, and the Kano battery energy storage system is used for converting redundant electric energy into heat energy for storage; specifically, a third valve (21) and a fifth valve (23) of the water supply bypass on a branch of the multistage molten salt heat exchanger (12) are closed, a No. 1 molten salt pump (16) is stopped, and a sixth valve (24) of the molten salt on the branch of the multistage molten salt heat exchanger (12) is closed; closing a first valve (19) on a branch of the condensed water entering the heat conduction oil-water heat exchanger (13), stopping the 1# heat conduction oil pump (17), and closing a seventh valve (25) on a branch of the heat conduction oil entering the heat conduction oil-water heat exchanger (13); the amount of the coal entering the boiler (1) of the coal-fired power generating unit is not changed, the working condition of the steam turbine only fluctuates slightly, then the steam turbine is maintained in a high-load working condition, and higher power generating efficiency is ensured; the motor (30) in the Carnot battery energy storage system drives the multistage charging compressor (31) to work, redundant electric energy of the coal-fired power generation and Carnot battery energy storage coupling system is converted into heat energy of three heat storage mediums, and the heat energy is finally stored in the molten salt storage tank (9), the heat conduction oil storage tank (10) and the cold water storage tank (11) respectively;
2) When the coal-fired power generation coupling storage tank system and the Carnot battery energy release system work normally in the electricity consumption peak, a water supply bypass is opened to enter a third valve (21) and a fifth valve (23) on a branch of the multi-stage molten salt heat exchanger (12), a No. 1 molten salt pump (16) is started, molten salt enters a sixth valve (24) on the branch of the multi-stage molten salt heat exchanger (12), at the moment, the water supply amount of the coal-fired power generator set entering the high-pressure heater (8) is reduced, the displacement steam extraction returns to the high-pressure cylinder (2) to do work further, the output of the steam turbine is increased, the water supply amount entering the boiler (1) is not changed, the water supply pump (15) is increased in power to cause the increase part of the water supply amount to be heated through the multi-stage molten salt heat exchanger (12), the generated new steam and the steam at the outlet of the boiler (1) are mixed to enter the steam turbine to do work, and the generated energy of the steam turbine is obviously increased; opening a first valve (19) on a branch of the condensed water entering the heat conduction oil-water heat exchanger (13), starting a No. 1 heat conduction oil pump (17), opening a seventh valve (25) on the branch of the heat conduction oil entering the heat conduction oil-water heat exchanger (13), reducing the condensed water quantity of the coal-fired generator set entering the low-pressure heater (6), and exhausting and extracting steam to return to the middle-low pressure cylinder (3) to further do work so as to increase the output of the steam turbine; the exhaust steam of the coal-fired generator set is not cooled by a cooling tower any more, but is directly cooled by cold water generated by a Carnot battery energy storage system; the discharging compressor (39) is utilized to pressurize the working medium in the Carnot battery energy release system, then the working medium respectively absorbs the heat of heat storage mediums in the heat conduction oil storage tank (10) and the molten salt storage tank (9) in the heat conduction oil-working medium heat exchanger (33) and the molten salt-working medium heat exchanger (32) to generate high-temperature and high-pressure working medium, the working medium is acted in the multi-stage discharging expander (40), the generated mechanical energy is converted into electric energy in the Carnot battery generator (41) and is output outwards, and the electric energy is added with the electric energy of the coal-fired generator (4) to meet the electric load requirement.
9. The method of operating a coal-fired power generation and canola battery energy storage coupling system of claim 8, wherein: when the Carnot battery energy storage system is operated, the operation time of the molten salt storage tank (9), the heat conducting oil storage tank (10) and the cold water storage tank (11) is 10 hours; when the Carnot battery energy release system is operated, the operation time of the molten salt storage tank (9), the heat conducting oil storage tank (10) and the cold water storage tank (11) is 5.5 hours.
10. The method of operating a coal-fired power generation and canola battery energy storage coupling system of claim 8, wherein: when the system is in a power consumption peak, in order to meet the requirement that the energy storage coupling system of the coal-fired power generation and the Carnot battery has higher efficiency, 56% of heat stored in the molten salt storage tank (9) is used for a coal-fired power generation unit, and 44% of heat is used for the energy release system of the Carnot battery; 68% of heat stored in the heat conduction oil storage tank (10) is used for a coal-fired power generation unit, and 32% is used for a Carnot battery energy release system; 81% of the cold energy stored in the cold water storage tank (11) is used for a coal-fired power generation unit, and 19% is used for a Carnot battery energy release system.
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