CN110748465A - Hydrogen energy storage solar energy coal-fired coupling flexible power generation system and operation method - Google Patents
Hydrogen energy storage solar energy coal-fired coupling flexible power generation system and operation method Download PDFInfo
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- CN110748465A CN110748465A CN201911001017.8A CN201911001017A CN110748465A CN 110748465 A CN110748465 A CN 110748465A CN 201911001017 A CN201911001017 A CN 201911001017A CN 110748465 A CN110748465 A CN 110748465A
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F03—MACHINES OR ENGINES FOR LIQUIDS; WIND, SPRING, OR WEIGHT MOTORS; PRODUCING MECHANICAL POWER OR A REACTIVE PROPULSIVE THRUST, NOT OTHERWISE PROVIDED FOR
- F03G—SPRING, WEIGHT, INERTIA OR LIKE MOTORS; MECHANICAL-POWER PRODUCING DEVICES OR MECHANISMS, NOT OTHERWISE PROVIDED FOR OR USING ENERGY SOURCES NOT OTHERWISE PROVIDED FOR
- F03G6/00—Devices for producing mechanical power from solar energy
- F03G6/06—Devices for producing mechanical power from solar energy with solar energy concentrating means
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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
- F22B33/00—Steam-generation plants, e.g. comprising steam boilers of different types in mutual association
- F22B33/18—Combinations of steam boilers with other apparatus
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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
- F22D1/003—Feed-water heater systems
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F24—HEATING; RANGES; VENTILATING
- F24S—SOLAR HEAT COLLECTORS; SOLAR HEAT SYSTEMS
- F24S60/00—Arrangements for storing heat collected by solar heat collectors
- F24S60/30—Arrangements for storing heat collected by solar heat collectors storing heat in liquids
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- H—ELECTRICITY
- H01—ELECTRIC ELEMENTS
- H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
- H01M8/00—Fuel cells; Manufacture thereof
- H01M8/06—Combination of fuel cells with means for production of reactants or for treatment of residues
- H01M8/0606—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants
- H01M8/0656—Combination of fuel cells with means for production of reactants or for treatment of residues with means for production of gaseous reactants by electrochemical means
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E10/00—Energy generation through renewable energy sources
- Y02E10/40—Solar thermal energy, e.g. solar towers
- Y02E10/46—Conversion of thermal power into mechanical power, e.g. Rankine, Stirling or solar thermal engines
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
- Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
- Y02E60/30—Hydrogen technology
- Y02E60/50—Fuel cells
Abstract
The invention discloses a hydrogen energy storage solar energy coal-fired coupling flexible power generation system and an operation method, wherein the system comprises a coal-fired power generation system and a hydrogen energy storage system, wherein the coal-fired power generation system is coupled with a solar energy heat generation system through a solar heat collection device, a heat storage medium and water supply heat exchanger, a primary water supply regulating valve and a secondary water supply regulating valve, and the hydrogen energy storage system comprises a rectifier switch, an electrolytic hydrogen production tank, an oxygen storage tank, a hydrogen-oxygen fuel cell, an inverter; the water supply flow of heat exchange of a heat storage medium flowing through the solar heat storage device is adjusted through the primary and secondary water supply adjusting valves, so that the solar energy is utilized to the maximum extent, and the coal consumption is reduced; by calculating the power generation power change caused by solar irradiation, the operation of the electrolytic hydrogen production tank and the hydrogen-oxygen fuel cell is controlled, the system power generation power fluctuation caused by the solar irradiation change is quickly counteracted, the power stability of the power transmitted to the power grid is realized, and the problem of light abandonment is solved; the invention can greatly improve the quick variable load and wide load operation capacity of the unit, and has small structural modification degree, small investment and good economical efficiency on the original coal-fired generator set.
Description
Technical Field
The invention relates to the technical field of multi-energy complementary power generation, in particular to a hydrogen energy storage solar energy coal-fired coupling flexible power generation system and an operation method.
Background
In recent years, under the requirement of low-carbon environmental protection development, the government of China accelerates the construction of multi-energy complementary demonstration projects. Solar energy is used as a clean and environment-friendly renewable energy source, the occupation ratio of energy structures in China is gradually increased, but due to the fact that the randomness and the fluctuation of the solar energy are high, the grid fluctuation is aggravated by large-scale power generation and grid connection, the demand of peak regulation and frequency modulation of a power grid is larger and larger, and the renewable energy source consumption in partial areas in China is difficult; at present, a coal-fired unit mainly undertakes the peak shaving task of a power system in China, but the existing coal-fired unit is difficult to quickly follow the frequently-changed automatic power generation control instruction of a power grid. Therefore, the solar thermal power generation and the coal-fired power generation are reasonably coupled and are provided with corresponding energy storage devices, the flexibility of the unit is improved, the effective storage and reutilization rate of electric energy is increased, and the method is an important means for realizing effective consumption of renewable energy sources. The hydrogen energy storage is a stable and clean chemical energy storage mode capable of realizing large-scale storage, and meanwhile, the electrolytic hydrogen production device is quick to start and quick in processing and adjusting speed, so that the hydrogen energy storage can be used as a good peak regulation energy storage option.
At present, no reasonable solution is available for enabling solar thermal power generation, a coal-fired power generator set and an energy storage link to completely consume solar energy, the requirement of a power grid on flexibility of the set is met, and the problem to be solved comprises the following steps:
1) solar thermal power generation is limited by weather, the requirement of a power grid on the power supply is difficult to meet stably and flexibly, a more potential scheme for coupling solar energy, coal and energy storage is required to be found, and the stability and flexibility of power supply of a generator set to the power grid are improved.
2) Due to the fluctuation of solar energy but the limited peak shaving performance of coal-fired units, more reasonable control methods are required to achieve the purpose of always maximizing the utilization of solar energy.
3) Because solar thermal power generation is limited by weather and the heat storage capacity in coal-fired power generation is limited, the control problem that how to match a hydrogen energy storage system with a solar coal-fired coupling power generation system to enable the hydrogen energy storage coupling solar coal-fired power generation system to be capable of adjusting peak more flexibly and efficiently needs to be solved.
Disclosure of Invention
In order to solve the problems in the prior art, the invention aims to provide a hydrogen energy storage solar energy and coal burning coupling flexible power generation system and an operation method thereof, the system can realize the coupling of solar energy thermal power generation and coal burning power generation, control the hydrogen energy storage system to quickly offset the change of power transmission to a power grid caused by the change of solar energy irradiation intensity, ensure that solar energy is always maximally utilized, stabilize the electric quantity transmitted to the power grid, simultaneously reduce the peak regulation pressure of a coal burning unit, and improve the flexibility and the economical efficiency of the system
In order to achieve the purpose, the invention adopts the following technical scheme:
a hydrogen energy storage solar energy coal-fired coupling flexible power generation system comprises a coal-fired power generation unit thermal system and a hydrogen energy storage system which are coupled with each other for solar energy thermal power generation: wherein the content of the first and second substances,
the thermodynamic system of the coal-fired power generation unit coupled with the solar thermal power generation comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine medium-low pressure cylinder 3, a condenser 4, a condensate pump 5, a low-pressure heater 6, a deaerator 7, a water feed pump 8, a secondary high-pressure heater 9 and a primary high-pressure heater 10 which are sequentially connected; the solar heat collector also comprises a heat storage medium and water supply heat exchanger 11, a solar heat collection device 12, a primary water supply regulating valve 13, a secondary water supply regulating valve 14 and a generator 15; the heat storage medium inlet of the heat storage medium and water supply heat exchanger 11 is communicated with the heat storage medium outlet of the solar heat collection device 12 through a pipeline, and the heat storage medium outlet is communicated with the heat storage medium inlet of the solar heat collection device 12 through a pipeline; the water supply inlet of the heat storage medium and the water supply heat exchanger 11 is communicated with the water working medium inlet of the secondary high-pressure heater 9 through a primary water supply regulating valve 13 and is also communicated with the water working medium inlet of the primary high-pressure heater 10 through a secondary water supply regulating valve 14; the heat storage medium and the water supply outlet of the water supply heat exchanger 11 are communicated with the water supply outlet of the primary high-pressure heater 10 through a pipeline; the superheated steam outlet of the boiler 1 is communicated with the inlet of the high-pressure cylinder 2 of the steam turbine; a feed water inlet of the boiler 1 is communicated with a feed water outlet of the first-stage high-pressure heater 10; the steam outlet of the high-pressure steam turbine cylinder 2 is communicated with the steam inlet of the low-pressure steam turbine cylinder 3 through a boiler 1; a first-stage steam extraction outlet of the steam turbine high-pressure cylinder 2 is communicated with a steam inlet of the first-stage high-pressure heater 10 through a pipeline; a first-stage steam extraction outlet of the low pressure cylinder 3 in the steam turbine is communicated with a steam inlet of a second-stage high pressure heater 9 through a pipeline, a second-stage steam extraction outlet is communicated with a steam inlet of a deaerator 7 through a pipeline, and a third-stage steam extraction outlet is communicated with a steam inlet of a low pressure heater 6 through a pipeline; a steam outlet of the turbine medium and low pressure cylinder 3 is communicated with an air inlet of a condenser 4; a water working medium outlet of the condenser 4 is communicated with a water working medium inlet of the low-pressure heater 6 through a condensate pump 5; the water working medium outlet of the low-pressure heater 6 is communicated with the water working medium inlet of the deaerator 7;
the hydrogen energy storage system comprises a rectification switch 16, a rectification unit 17, an electrolytic hydrogen production tank 18, a hydrogen storage tank 19, an oxyhydrogen fuel cell 21, an inversion unit 22 and an inversion switch 23 which are connected in sequence, and further comprises an oxygen storage tank 20, a hydrogen inlet regulating valve 24, an oxygen inlet regulating valve 25, a hydrogen outlet regulating valve 26 and an oxygen outlet regulating valve 27; the alternating current side of the rectifying unit 17 is communicated with the output side of the generator 15 through a rectifying switch 16; the electrolysis end of the electrolysis hydrogen production tank 18 is communicated with the direct current side of the rectifying unit 17 through an electrolysis electrode; the hydrogen outlet of the electrolytic hydrogen production tank 18 is communicated with the hydrogen inlet of the hydrogen storage tank 19 through a hydrogen inlet regulating valve 24; the oxygen outlet of the electrolytic hydrogen production tank 18 is communicated with the oxygen inlet of the oxygen storage tank 20 through an oxygen inlet regulating valve 25; the hydrogen outlet of the hydrogen storage tank 19 is communicated with the hydrogen inlet of the hydrogen-oxygen fuel cell 21 through a hydrogen outlet regulating valve 26; the oxygen outlet of the oxygen storage tank 20 is communicated with the oxygen inlet of the oxyhydrogen fuel cell 21 through an oxygen outlet regulating valve 27; the electric energy output end of the oxyhydrogen fuel cell 21 is communicated with the direct current side of the inverter unit 22; the ac side of the inverter unit 22 is connected to the grid through an inverter switch 23.
The electrolytic hydrogen production tank 18 is one of an alkaline aqueous solution electrolytic hydrogen production tank, a solid oxide electrolytic tank or a proton membrane electrolytic tank or a combination of one or more of the alkaline aqueous solution electrolytic hydrogen production tank, the solid oxide electrolytic tank and the proton membrane electrolytic tank in parallel.
The heat storage medium used by the heat storage medium, the water supply heat exchanger 11 and the solar heat collection device 12 is a heat-conducting oil single-phase flowing medium.
The hydrogen-oxygen fuel cell 21 uses a series-parallel combination of one or more of an alkaline fuel cell, an ion-exchange fuel cell, or a solid oxide hydrogen-oxygen fuel cell.
The temperature of the heat storage medium heated by the solar heat collection device 12 is 300-390 ℃.
The operation method of the solar coal-fired coupling flexible power generation system comprises the steps of adjusting the water supply flow through the first-stage water supply adjusting valve 13 and the second-stage water supply adjusting valve 14 to ensure the maximum utilization of solar energy, when the solar irradiation condition changes, the stable generated energy transmitted to a power grid needs to be maintained and the solar thermal power generation needs to be effectively utilized at the same time, namely when the solar irradiation is increased, the rectifier switch 16 is closed, the hydrogen inlet adjusting valve 24 and the oxygen inlet adjusting valve 25 are opened, the electrolytic hydrogen production tank 18 is started, the hydrogen outlet adjusting valve 26 and the oxygen outlet adjusting valve 27 are closed, the hydrogen-oxygen fuel cell 21 is stopped, the inverter switch 23 is disconnected, and: the stability of the electric quantity transmitted to the power grid is ensured, the hydrogen is produced by electrolyzing redundant electric energy generated by a generator except the electric quantity transmitted to the power grid, and the electric energy is converted into chemical energy and stored in a hydrogen storage tank 19 and an oxygen storage tank 20; when the solar radiation is reduced, the rectifier switch 16 is switched off, the inverter switch 23 is switched on, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are switched off, the electrolytic hydrogen production tank 18 is stopped, the hydrogen-oxygen fuel cell 21 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are regulated, and the target is regulated: the electric energy generated by the oxyhydrogen fuel cell 21 can make up the electric energy which is less generated by the generator, and the stability of the electric quantity of the power transmission grid is ensured.
The operation method of the hydrogen energy storage solar coal-fired coupling flexible power generation system comprises the following steps: when the solar irradiation condition changes, the adjusting step is divided into three steps:
in the first step, the water supply share α which is led out from the outlet of the water supply pump 8 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by a primary water supply adjusting valve 132The water supply share α which is led out from the water supply outlet of the secondary high-pressure heater 9 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by the secondary water supply adjusting valve 141The heat storage medium and the feed water heat exchanger 11 are used for heating the led-out feed water and converging the feed water with the outlet feed water of the primary high-pressure heater 10, the inlet feed water temperature entering the boiler 1 is controlled to be not less than the outlet feed water temperature of the primary high-pressure heater 10, and the maximum utilization of solar energy is ensured;
secondly, calculating the variable quantity delta P of the generated power of the coal-fired generator set coupled with the solar thermal power generation according to the equivalent heat drop principleeThe calculation method is as follows:
ΔH＝α1τ1η1+α2(τ1η1+τ2η2)
in the formula: delta H is the system cyclic work variation, kJ/kg; delta PeThe power generation power variation of the coal-fired power generator set is kW, α1、α2The part of the water supply which is led out from the water supply outlet of the secondary high-pressure heater 9 and enters the heat storage medium and water supply heat exchanger 11 is respectively adjusted by a secondary water supply adjusting valve 14, and the part of the water supply which is led out from the outlet of the water supply pump 8 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by a primary water supply adjusting valve 13; tau is1、τ2Respectively 1kg of water in the first-stage high-pressure heater 10 and 1kg of water in the second-stage high-pressure heater 9, kJ/kg1And η2Respectively, the first stage steam extraction efficiency of the high pressure cylinder 2 of the steam turbine and the first stage steam extraction efficiency of the low pressure cylinder 3 of the steam turbineStage steam extraction efficiency; d0η is the steam consumption in kg/hmη for mechanical transmission efficiencygTo the generator efficiency;
and thirdly, adjusting the power of the hydrogen energy storage system according to the generated power variable quantity calculated in the second step, so that the variable quantity of the power of the generator is counteracted, and the power transmission stability to the power grid is ensured.
The operation method of the hydrogen energy storage solar coal-fired coupling flexible power generation system comprises the following specific control method in the third step: when the amount of change of the generated power is Δ PeIn order to correct the time, the rectifier switch 16 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are opened, the electrolytic hydrogen production tank 18 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are closed, the hydrogen-oxygen fuel cell 21 is stopped, the inverter switch 23 is disconnected, the output voltage of the rectifier unit 17 and the number of the sub-tanks in the electrolytic hydrogen production tank 18 in series-parallel connection are regulated, so that the power consumption of electrolytic hydrogen production is equal to the power variation delta P of the coal-fired generator seteThe power transmitted to the power grid by the system is stable, and the electric energy is converted into the chemical energy of hydrogen and oxygen and is stored in the hydrogen storage tank 19 and the oxygen storage tank 20; when the amount of change of the generated power is Δ PeWhen the power is negative, the rectifier switch 16 is disconnected, the inverter switch 23 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are closed, the electrolytic hydrogen production tank 18 is stopped, the oxyhydrogen fuel cell 21 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are regulated, the number of the serial connection of the neutron fuel cells in the oxyhydrogen fuel cell 18 is regulated, and the duty ratio of the inverter unit 22 is regulated simultaneously, so that the power generation power of the oxyhydrogen fuel cell 21 and the absolute value | delta P equal to the power generation power variation of the coal-fired power generator set are enabled toeAnd the power generated by the generator is made up for the shortage, and the stability of the power transmitted to the power grid is ensured.
The operation method of the solar coal-fired coupling flexible power generation system further comprises the following steps: when the illumination condition is good and the generating set needs rapid load-up, through adjusting one-level feed water regulating valve 13 and two-level feed water regulating valve 14, adjust water supply flow and temperature, close contravariant switch 23, start oxyhydrogen fuel cell 21 fast, adjust hydrogen export governing valve 26 and oxygen export governing valve 27, break off rectifier switch 16, close hydrogen entry governing valve 24 and oxygen entry governing valve 25, stop electrolysis hydrogen manufacturing tank 18, the regulation target is: the hydrogen-oxygen fuel cell is rapidly switched, stored hydrogen is used for generating electricity through the hydrogen-oxygen fuel cell, the water supply temperature is increased, the change rate of the flow of main steam entering a high-pressure cylinder 2 of the steam turbine from a boiler 1 and the flow of reheated steam entering a low-pressure cylinder 3 of the steam turbine is increased, and the power transmitted to a power grid by a coal-fired power generation system and a hydrogen energy storage system coupled with solar energy can meet the requirement of the rapid load change rate of the power grid and can be flexibly adjusted in peak; when the power grid requires the power generation system to reduce the load, the inverter switch 23 is disconnected, the rectifier switch 16 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are regulated, the electrolytic hydrogen production tank 18 is quickly started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are closed, the hydrogen-oxygen fuel cell 21 is quickly stopped, and the regulation target is as follows: under the condition of not changing the output of the steam turbine, the power transmission amount to the power grid is reduced, and the solar heat is effectively stored by utilizing electrolytic hydrogen production, so that the system can operate under low load.
Compared with the prior art, the invention has the following advantages:
(1) the invention can calculate the variation of the power generation amount of the generator caused by the solar irradiation change, quickly compensate the difference between the power generation amount of the generator caused by the solar irradiation change and the required power amount of the power grid by starting the electrolytic cell or the hydrogen-oxygen fuel cell, quickly absorb the fluctuation of renewable energy, reduce the requirement on the variable load of the coal-fired unit, ensure the stability of the power amount transmitted to the power grid and solve the problem of light abandonment.
(2) The invention can control the temperature of the feed water entering the boiler, adjust the flow of the feed water entering the heat storage medium and the feed water heat exchanger, ensure the maximum utilization of solar energy, reduce the coal consumption by utilizing the solar energy, improve the rapid load-variable operation capacity and the wide load operation capacity and improve the economical efficiency of the system.
(3) The invention can couple the solar heat collection device, the heat storage medium and the water supply heat exchanger to the original coal-fired generator set in parallel, has small change to the pipeline of the original coal-fired generator set, and has simple structure and easy execution.
Drawings
FIG. 1 is a schematic diagram of a hydrogen energy storage solar coal-fired coupling flexible power generation system according to the present invention.
Detailed Description
The present invention will be described in further detail with reference to the accompanying drawings and specific embodiments.
As shown in fig. 1, the hydrogen energy storage solar coal-fired coupling flexible power generation system of the invention comprises a coal-fired power generation unit thermal system and a hydrogen energy storage system which are coupled with solar thermal power generation: wherein the content of the first and second substances,
the thermodynamic system of the coal-fired power generation unit coupled with the solar thermal power generation comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine medium-low pressure cylinder 3, a condenser 4, a condensate pump 5, a low-pressure heater 6, a deaerator 7, a water feed pump 8, a secondary high-pressure heater 9 and a primary high-pressure heater 10 which are sequentially connected; the solar heat collector also comprises a heat storage medium and water supply heat exchanger 11, a solar heat collection device 12, a primary water supply regulating valve 13, a secondary water supply regulating valve 14 and a generator 15; the heat storage medium inlet of the heat storage medium and water supply heat exchanger 11 is communicated with the heat storage medium outlet of the solar heat collection device 12 through a pipeline, and the heat storage medium outlet is communicated with the heat storage medium inlet of the solar heat collection device 12 through a pipeline; the water supply inlet of the heat storage medium and the water supply heat exchanger 11 is communicated with the water working medium inlet of the secondary high-pressure heater 9 through a primary water supply regulating valve 13 and is also communicated with the water working medium inlet of the primary high-pressure heater 10 through a secondary water supply regulating valve 14; the heat storage medium and the water supply outlet of the water supply heat exchanger 11 are communicated with the water supply outlet of the primary high-pressure heater 10 through a pipeline; the superheated steam outlet of the boiler 1 is communicated with the inlet of the high-pressure cylinder 2 of the steam turbine; a feed water inlet of the boiler 1 is communicated with a feed water outlet of the first-stage high-pressure heater 10; the steam outlet of the high-pressure steam turbine cylinder 2 is communicated with the steam inlet of the low-pressure steam turbine cylinder 3 through a boiler 1; a first-stage steam extraction outlet of the steam turbine high-pressure cylinder 2 is communicated with a steam inlet of the first-stage high-pressure heater 10 through a pipeline; a first-stage steam extraction outlet of the low pressure cylinder 3 in the steam turbine is communicated with a steam inlet of a second-stage high pressure heater 9 through a pipeline, a second-stage steam extraction outlet is communicated with a steam inlet of a deaerator 7 through a pipeline, and a third-stage steam extraction outlet is communicated with a steam inlet of a low pressure heater 6 through a pipeline; a steam outlet of the turbine medium and low pressure cylinder 3 is communicated with an air inlet of a condenser 4; a water working medium outlet of the condenser 4 is communicated with a water working medium inlet of the low-pressure heater 6 through a condensate pump 5; the water working medium outlet of the low-pressure heater 6 is communicated with the water working medium inlet of the deaerator 7;
the hydrogen energy storage system comprises a rectification switch 16, a rectification unit 17, an electrolytic hydrogen production tank 18, a hydrogen storage tank 19, an oxyhydrogen fuel cell 21, an inversion unit 22 and an inversion switch 23 which are connected in sequence, and further comprises an oxygen storage tank 20, a hydrogen inlet regulating valve 24, an oxygen inlet regulating valve 25, a hydrogen outlet regulating valve 26 and an oxygen outlet regulating valve 27; the alternating current side of the rectifying unit 17 is communicated with the output side of the generator 15 through a rectifying switch 16; the electrolysis end of the electrolysis hydrogen production tank 18 is communicated with the direct current side of the rectifying unit 17 through an electrolysis electrode; the hydrogen outlet of the electrolytic hydrogen production tank 18 is communicated with the hydrogen inlet of the hydrogen storage tank 19 through a hydrogen inlet regulating valve 24; the oxygen outlet of the electrolytic hydrogen production tank 18 is communicated with the oxygen inlet of the oxygen storage tank 20 through an oxygen inlet regulating valve 25; the hydrogen outlet of the hydrogen storage tank 19 is communicated with the hydrogen inlet of the hydrogen-oxygen fuel cell 21 through a hydrogen outlet regulating valve 26; the oxygen outlet of the oxygen storage tank 20 is communicated with the oxygen inlet of the oxyhydrogen fuel cell 21 through an oxygen outlet regulating valve 27; the electric energy output end of the oxyhydrogen fuel cell 21 is communicated with the direct current side of the inverter unit 22; the ac side of the inverter unit 22 is connected to the grid through an inverter switch 23.
As a preferred embodiment of the present invention, the electrolytic hydrogen production tank 18 is one of an alkaline aqueous solution electrolytic hydrogen production tank, a solid oxide electrolytic tank or a proton membrane electrolytic tank or a combination of one or more of them in parallel.
In a preferred embodiment of the present invention, the heat storage medium used in the heat storage and water supply heat exchanger 11 and the solar heat collection device 12 is a heat-conducting oil-type single-phase flowing medium.
As a preferred embodiment of the present invention, the hydrogen-oxygen fuel cell 21 uses a series-parallel combination of one or more of an alkaline fuel cell, an ion-exchange fuel cell, or a solid oxide hydrogen-oxygen fuel cell.
In a preferred embodiment of the present invention, the temperature of the heat storage medium heated by the solar heat collection device 12 is 300 to 390 ℃.
As shown in fig. 1, the operation method of the solar coal-fired coupling flexible power generation system of the present invention adjusts the water supply flow through the first-stage water supply regulating valve 13 and the second-stage water supply regulating valve 14 to ensure the maximum utilization of solar energy, and when the solar irradiation condition changes, the generated energy delivered to the power grid needs to be maintained stable and the solar thermal power generation needs to be effectively utilized at the same time, that is, when the solar irradiation increases, the rectifier switch 16 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are opened, the electrolytic hydrogen production tank 18 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are closed, the hydrogen-oxygen fuel cell 21 is stopped, the inverter switch: the stability of the electric quantity transmitted to the power grid is ensured, the hydrogen is produced by electrolyzing redundant electric energy generated by a generator except the electric quantity transmitted to the power grid, and the electric energy is converted into chemical energy and stored in a hydrogen storage tank 19 and an oxygen storage tank 20; when the solar radiation is reduced, the rectifier switch 16 is switched off, the inverter switch 23 is switched on, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are switched off, the electrolytic hydrogen production tank 18 is stopped, the hydrogen-oxygen fuel cell 21 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are regulated, and the target is regulated: the electric energy generated by the oxyhydrogen fuel cell 21 can make up the electric energy which is less generated by the generator, and the stability of the electric quantity of the power transmission grid is ensured.
As shown in fig. 1, the operation method of the hydrogen energy storage solar energy coal-fired coupling flexible power generation system of the present invention includes one implementation method: when the solar irradiation condition changes, the adjusting step is divided into three steps:
in the first step, the water supply share α which is led out from the outlet of the water supply pump 8 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by a primary water supply adjusting valve 132The water supply share α which is led out from the water supply outlet of the secondary high-pressure heater 9 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by the secondary water supply adjusting valve 141The heat storage medium and the feed water heat exchanger 11 are used for heating the led feed water and converging the led feed water with the outlet feed water of the primary high-pressure heater 10, the inlet feed water temperature entering the boiler 1 is controlled to be not less than the outlet feed water temperature of the primary high-pressure heater 10, and the solar energy is ensuredThe utilization is maximized;
secondly, calculating the variable quantity delta P of the generated power of the coal-fired generator set coupled with the solar thermal power generation according to the equivalent heat drop principleeThe calculation method is as follows:
ΔH＝α1τ1η1+α2(τ1η1+τ2η2)
in the formula: delta H is the system cyclic work variation, kJ/kg; delta PeThe power generation power variation of the coal-fired power generator set is kW, α1、α2The part of the water supply which is led out from the water supply outlet of the secondary high-pressure heater 9 and enters the heat storage medium and water supply heat exchanger 11 is respectively adjusted by a secondary water supply adjusting valve 14, and the part of the water supply which is led out from the outlet of the water supply pump 8 and enters the heat storage medium and water supply heat exchanger 11 is adjusted by a primary water supply adjusting valve 13; tau is1、τ2Respectively 1kg of water in the first-stage high-pressure heater 10 and 1kg of water in the second-stage high-pressure heater 9, kJ/kg1And η2The first-stage steam extraction efficiency of the high-pressure cylinder 2 of the steam turbine and the first-stage steam extraction efficiency of the low-pressure cylinder 3 of the steam turbine are respectively set; d0η is the steam consumption in kg/hmη for mechanical transmission efficiencygTo the generator efficiency;
and thirdly, adjusting the power of the hydrogen energy storage system according to the generated power variable quantity calculated in the second step, so that the variable quantity of the power of the generator is counteracted, and the power transmission stability to the power grid is ensured.
As shown in fig. 1, the operation method of the hydrogen energy storage solar energy coal-fired coupling flexible power generation system of the present invention, wherein a specific control method of the third step may be: when the amount of change of the generated power is Δ PeTo do this, the rectifier switch 16 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are opened, the electrolytic hydrogen production tank 18 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are closed, the hydrogen-oxygen fuel cell 21 is stopped, the inverter switch 23 is turned off, and the output voltage of the rectifier unit 17 and the output voltage are regulatedThe number of the sub-tanks in the electrolysis hydrogen production tank 18 is in series-parallel connection, so that the power consumption of the electrolysis hydrogen production is equal to the power generation power variation delta P of the coal-fired generator seteThe power transmitted to the power grid by the system is stable, and the electric energy is converted into the chemical energy of hydrogen and oxygen and is stored in the hydrogen storage tank 19 and the oxygen storage tank 20; when the amount of change of the generated power is Δ PeWhen the power is negative, the rectifier switch 16 is disconnected, the inverter switch 23 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are closed, the electrolytic hydrogen production tank 18 is stopped, the oxyhydrogen fuel cell 21 is started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are regulated, the number of the serial connection of the neutron fuel cells in the oxyhydrogen fuel cell 18 is regulated, and the duty ratio of the inverter unit 22 is regulated simultaneously, so that the power generation power of the oxyhydrogen fuel cell 21 and the absolute value | delta P equal to the power generation power variation of the coal-fired power generator set are enabled toeAnd the power generated by the generator is made up for the shortage, and the stability of the power transmitted to the power grid is ensured.
As shown in fig. 1, the method for operating the solar coal-fired coupling flexible power generation system of the present invention further comprises: when the illumination condition is good and the generating set needs rapid load-up, through adjusting one-level feed water regulating valve 13 and two-level feed water regulating valve 14, adjust water supply flow and temperature, close contravariant switch 23, start oxyhydrogen fuel cell 21 fast, adjust hydrogen export governing valve 26 and oxygen export governing valve 27, break off rectifier switch 16, close hydrogen entry governing valve 24 and oxygen entry governing valve 25, stop electrolysis hydrogen manufacturing tank 18, the regulation target is: the hydrogen-oxygen fuel cell is rapidly switched, stored hydrogen is used for generating electricity through the hydrogen-oxygen fuel cell, the water supply temperature is increased, the change rate of the flow of main steam entering a high-pressure cylinder 2 of the steam turbine from a boiler 1 and the flow of reheated steam entering a low-pressure cylinder 3 of the steam turbine is increased, and the power transmitted to a power grid by a coal-fired power generation system and a hydrogen energy storage system coupled with solar energy can meet the requirement of the rapid load change rate of the power grid and can be flexibly adjusted in peak; when the power grid requires the power generation system to reduce the load, the inverter switch 23 is disconnected, the rectifier switch 16 is closed, the hydrogen inlet regulating valve 24 and the oxygen inlet regulating valve 25 are regulated, the electrolytic hydrogen production tank 18 is quickly started, the hydrogen outlet regulating valve 26 and the oxygen outlet regulating valve 27 are closed, the hydrogen-oxygen fuel cell 21 is quickly stopped, and the regulation target is as follows: under the condition of not changing the output of the steam turbine, the power transmission amount to the power grid is reduced, and the solar heat is effectively stored by utilizing electrolytic hydrogen production, so that the system can operate under low load.
The invention improves the capability of solving the problem of eliminating the power change of renewable energy sources in a coal-fired power plant by arranging a thermal power system and a hydrogen energy storage system of a coal-fired power generator set coupled with solar thermal power generation, controls the operation of an electrolytic hydrogen production tank 18 and an oxyhydrogen fuel cell 21 by calculating the variation of the generated energy of the generator caused by the solar radiation change, adjusts a rectifying unit 17 and an inverting unit 22, quickly counteracts the fluctuation of the generated power of the thermal power generation system caused by the solar radiation change, realizes the electric quantity stability of the power transmitted to a power grid, solves the problem of light abandoning, and controls the water supply flow and the temperature by mutually matching with a primary water supply regulating valve 13 and a secondary water supply regulating valve 14, thereby realizing the maximum utilization of. Meanwhile, the combustion power of the hydrogen production and hydrogen-oxygen fuel cell is controlled by adjusting the hydrogen inlet adjusting valve 24, the oxygen inlet adjusting valve 25, the hydrogen outlet adjusting valve 26 and the oxygen outlet adjusting valve 27, so that the rapid load-variable operation capacity and the wide load operation capacity of the unit are greatly improved, the flexibility and the economical efficiency of the system are improved, and the comprehensive utilization of multiple energy sources is realized.
Claims (9)
1. A hydrogen energy storage solar energy coal-fired coupling flexible power generation system is characterized in that: the system comprises a coal-fired generator set thermal system and a hydrogen energy storage system which are coupled with solar thermal power generation: wherein the content of the first and second substances,
the thermodynamic system of the coal-fired power generation unit coupled with the solar thermal power generation comprises a boiler (1), a turbine high-pressure cylinder (2), a turbine medium-low pressure cylinder (3), a condenser (4), a condensate pump (5), a low-pressure heater (6), a deaerator (7), a water feed pump (8), a secondary high-pressure heater (9) and a primary high-pressure heater (10) which are sequentially connected; the solar heat collector also comprises a heat storage medium and water supply heat exchanger (11), a solar heat collection device (12), a primary water supply regulating valve (13), a secondary water supply regulating valve (14) and a generator (15); the heat storage medium inlet of the heat storage medium and water supply heat exchanger (11) is communicated with the heat storage medium outlet of the solar heat collection device (12) through a pipeline, and the heat storage medium outlet is communicated with the heat storage medium inlet of the solar heat collection device (12) through a pipeline; the water supply inlet of the heat storage medium and the water supply heat exchanger (11) is communicated with the water working medium inlet of the secondary high-pressure heater (9) through a primary water supply regulating valve (13) and is also communicated with the water working medium inlet of the primary high-pressure heater (10) through a secondary water supply regulating valve (14); the heat storage medium and a water supply outlet of the water supply heat exchanger (11) are communicated with a water supply outlet of the primary high-pressure heater (10) through a pipeline; the superheated steam outlet of the boiler (1) is communicated with the inlet of the high-pressure cylinder (2) of the steam turbine; a feed water inlet of the boiler (1) is communicated with a feed water outlet of the first-stage high-pressure heater (10); the steam outlet of the high-pressure cylinder (2) of the steam turbine is communicated with the steam inlet of the low-pressure cylinder (3) of the steam turbine through a boiler (1); a first-stage steam extraction outlet of the steam turbine high-pressure cylinder (2) is communicated with a steam inlet of the first-stage high-pressure heater (10) through a pipeline; a first-stage steam extraction outlet of the low-pressure cylinder (3) in the steam turbine is communicated with a steam inlet of a second-stage high-pressure heater (9) through a pipeline, a second-stage steam extraction outlet is communicated with a steam inlet of a deaerator (7) through a pipeline, and a third-stage steam extraction outlet is communicated with a steam inlet of a low-pressure heater (6) through a pipeline; a steam outlet of the low pressure cylinder (3) in the steam turbine is communicated with an air inlet of a condenser (4); a water working medium outlet of the condenser (4) is communicated with a water working medium inlet of the low-pressure heater (6) through a condensate pump (5); the water medium outlet of the low-pressure heater (6) is communicated with the water medium inlet of the deaerator (7);
the hydrogen energy storage system comprises a rectifying switch (16), a rectifying unit (17), an electrolytic hydrogen production tank (18), a hydrogen storage tank (19), an oxyhydrogen fuel cell (21), an inverter unit (22) and an inverter switch (23) which are connected in sequence, and also comprises an oxygen storage tank (20), a hydrogen inlet regulating valve (24), an oxygen inlet regulating valve (25), a hydrogen outlet regulating valve (26) and an oxygen outlet regulating valve (27); the alternating current side of the rectifying unit (17) is communicated with the output side of the generator (15) through a rectifying switch (16); the electrolysis end of the electrolysis hydrogen production tank (18) is communicated with the direct current side of the rectification unit (17) through an electrolysis electrode; a hydrogen outlet of the electrolytic hydrogen production tank (18) is communicated with a hydrogen inlet of the hydrogen storage tank (19) through a hydrogen inlet regulating valve (24); an oxygen outlet of the electrolytic hydrogen production tank (18) is communicated with an oxygen inlet of the oxygen storage tank (20) through an oxygen inlet regulating valve (25); the hydrogen outlet of the hydrogen storage tank (19) is communicated with the hydrogen inlet of the hydrogen-oxygen fuel cell (21) through a hydrogen outlet regulating valve (26); the oxygen outlet of the oxygen storage tank (20) is communicated with the oxygen inlet of the oxyhydrogen fuel cell (21) through an oxygen outlet regulating valve (27); the electric energy output end of the oxyhydrogen fuel cell (21) is communicated with the direct current side of the inverter unit (22); the alternating current side of the inversion unit (22) is communicated with a power grid through an inversion switch (23).
2. The hydrogen energy storage solar coal-fired coupling flexible power generation system of claim 1, characterized in that: the electrolytic hydrogen production tank (18) uses one or more of an alkaline aqueous solution electrolytic hydrogen production tank, a solid oxide electrolytic tank or a proton membrane electrolytic tank in series-parallel connection.
3. The hydrogen energy storage solar coal-fired coupling flexible power generation system of claim 1, characterized in that: the heat storage medium used by the heat storage medium, the water supply heat exchanger (11) and the solar heat collection device (12) is a heat-conducting oil single-phase flowing medium.
4. The hydrogen energy storage solar coal-fired coupling flexible power generation system of claim 1, characterized in that: the hydrogen-oxygen fuel cell (21) uses a series-parallel combination of one or more of an alkaline fuel cell, an ion-exchange fuel cell, or a solid oxide hydrogen-oxygen fuel cell.
5. The hydrogen energy storage solar coal-fired coupling flexible power generation system of claim 1, characterized in that: the temperature of the heat storage medium heated by the solar heat collection device (12) is between 300 and 390 ℃.
6. The method of any one of claims 1 to 5 for operating a hydrogen energy storage solar coal-fired coupled flexible power generation system, wherein: adjust the feedwater flow through one-level feed water governing valve (13) and second grade feed water governing valve (14), guarantee the maximize utilization of solar energy, when the solar irradiation condition changes, need maintain simultaneously and deliver to the stable and effective solar thermal power generation of utilization of generated energy of electric wire netting, when solar irradiation increases promptly, closed rectifier switch (16), open hydrogen entry governing valve (24) and oxygen entry governing valve (25), start electrolysis hydrogen manufacturing groove (18), close hydrogen outlet governing valve (26) and oxygen outlet governing valve (27), stop oxyhydrogen fuel cell (21), disconnection contravariant switch (23), adjust the target: the stability of the electric quantity transmitted to the power grid is ensured, the hydrogen is produced by electrolyzing redundant electric energy generated by a generator except the electric quantity transmitted to the power grid, and the electric energy is converted into chemical energy and stored in a hydrogen storage tank (19) and an oxygen storage tank (20); when solar radiation is reduced, the rectifier switch (16) is disconnected, the inverter switch (23) is closed, the hydrogen inlet regulating valve (24) and the oxygen inlet regulating valve (25) are closed, the electrolytic hydrogen production tank (18) is stopped, the hydrogen-oxygen fuel cell (21) is started, the hydrogen outlet regulating valve (26) and the oxygen outlet regulating valve (27) are regulated, and the target is regulated: the electric energy generated by the hydrogen-oxygen fuel cell (21) can make up for the electric energy which is generated by the generator less, and the stability of the electric quantity of the power transmission grid is ensured.
7. The method of operation of claim 6, wherein: one implementation method is as follows: when the solar irradiation condition changes, the adjusting step is divided into three steps:
in the first step, the water supply share α which is led out from the outlet of the water supply pump (8) and enters the heat storage medium and water supply heat exchanger (11) is adjusted by a primary water supply adjusting valve (13)2The water supply share α which is led out from the water supply outlet of the secondary high-pressure heater (9) and enters the heat storage medium and water supply heat exchanger (11) is adjusted by a secondary water supply adjusting valve (14)1The heat storage medium and the water supply heat exchanger (11) are used for heating the led-out water supply and converging the water supply with the outlet water supply of the first-stage high-pressure heater (10), the inlet water supply temperature entering the boiler (1) is controlled to be not less than the outlet water supply temperature of the first-stage high-pressure heater (10), and the maximum utilization of solar energy is ensured;
secondly, calculating the variable quantity delta P of the generated power of the coal-fired generator set coupled with the solar thermal power generation according to the equivalent heat drop principleeThe calculation method is as follows:
ΔH＝α1τ1η1+α2(τ1η1+τ2η2)
in the formula: delta H is the system cyclic work variation, kJ/kg; delta PeThe power generation power variation of the coal-fired power generator set is kW, α1、α2The part of the water supply which is led out from the water supply outlet of the secondary high-pressure heater (9) and enters the heat storage medium and water supply heat exchanger (11) is respectively adjusted for a secondary water supply adjusting valve (14), and the part of the water supply which is led out from the outlet of the water supply pump (8) and enters the heat storage medium and water supply heat exchanger (11) is adjusted for a primary water supply adjusting valve (13); tau is1、τ2Respectively 1kg of water in the first-stage high-pressure heater (10) and 1kg of water in the second-stage high-pressure heater (9), kJ/kg, η1And η2The first-stage steam extraction efficiency of the high-pressure cylinder (2) of the steam turbine and the first-stage steam extraction efficiency of the low-pressure cylinder (3) of the steam turbine are respectively set; d0η is the steam consumption in kg/hmη for mechanical transmission efficiencygTo the generator efficiency;
and thirdly, adjusting the power of the hydrogen energy storage system according to the generated power variable quantity calculated in the second step, so that the variable quantity of the power of the generator is counteracted, and the power transmission stability to the power grid is ensured.
8. The method of operation of claim 7, wherein: wherein, a concrete control method of the third step is as follows: when the amount of change of the generated power is Δ PeIn order to correct the time, a rectifier switch (16) is closed, a hydrogen inlet regulating valve (24) and an oxygen inlet regulating valve (25) are opened, an electrolytic hydrogen production tank (18) is started, a hydrogen outlet regulating valve (26) and an oxygen outlet regulating valve (27) are closed, a hydrogen-oxygen fuel cell (21) is stopped, an inverter switch (23) is disconnected, the output voltage of a rectifier unit (17) and the number of sub-tanks in the electrolytic hydrogen production tank (18) in series-parallel connection are regulated, and the power consumption of electrolytic hydrogen production is equal to the power variation delta P of a coal-fired generator seteThe power transmitted to the power grid by the system is stable, and the system canThe electric energy is converted into chemical energy of hydrogen and oxygen and stored in a hydrogen storage tank (19) and an oxygen storage tank (20); when the amount of change of the generated power is Δ PeWhen the power is negative, the rectifier switch (16) is disconnected, the inverter switch (23) is closed, the hydrogen inlet regulating valve (24) and the oxygen inlet regulating valve (25) are closed, the electrolytic hydrogen production tank (18) is stopped, the hydrogen-oxygen fuel cell (21) is started, the hydrogen outlet regulating valve (26) and the oxygen outlet regulating valve (27) are regulated, the number of the hydrogen-oxygen fuel cell in the hydrogen-oxygen fuel cell (18) in series is regulated, and the duty ratio of the inverter unit (22) is regulated simultaneously, so that the power generation power of the hydrogen-oxygen fuel cell (21) and the absolute value | delta P equal to the power generation power variation of the coal-eAnd the power generated by the generator is made up for the shortage, and the stability of the power transmitted to the power grid is ensured.
9. A method of operating a hydrogen energy storage solar coal-fired coupled flexible power generation system as claimed in any of claims 1 to 5, further characterized by: when the illumination condition is good and generating set needs quick load-raising, through adjusting one-level feed water governing valve (13) and second grade feed water governing valve (14), adjust water flow and temperature, closed contravariant switch (23), quick start oxyhydrogen fuel cell (21), adjust hydrogen export governing valve (26) and oxygen export governing valve (27), disconnection rectifier switch (16), close hydrogen entry governing valve (24) and oxygen entry governing valve (25), stop electrolysis hydrogen manufacturing groove (18), the regulation target is: the hydrogen-oxygen fuel cell is rapidly switched, stored hydrogen is used for generating electricity through the hydrogen-oxygen fuel cell, the water supply temperature is increased, the change rate of the main steam flow entering a high pressure cylinder (2) of a steam turbine from a boiler (1) and the reheat steam flow entering a low pressure cylinder (3) of the steam turbine is increased, and the power transmitted to a power grid by a coal-fired power generation system and a hydrogen energy storage system coupled with solar energy can meet the requirement of the rapid load change rate of the power grid and can be flexibly adjusted in peak; when the power grid requires the load reduction of the power generation system, the inverter switch (23) is disconnected, the rectifier switch (16) is closed, the hydrogen inlet regulating valve (24) and the oxygen inlet regulating valve (25) are regulated, the electrolytic hydrogen production tank (18) is quickly started, the hydrogen outlet regulating valve (26) and the oxygen outlet regulating valve (27) are closed, the hydrogen-oxygen fuel cell (21) is quickly stopped, and the regulation target is as follows: under the condition of not changing the output of the steam turbine, the power transmission amount to the power grid is reduced, and the solar heat is effectively stored by utilizing electrolytic hydrogen production, so that the system can operate under low load.
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