CN117090646A - Coupled RSOC deep peak shaving coal-fired power generation system and operation method thereof - Google Patents

Coupled RSOC deep peak shaving coal-fired power generation system and operation method thereof Download PDF

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Publication number
CN117090646A
CN117090646A CN202311046391.6A CN202311046391A CN117090646A CN 117090646 A CN117090646 A CN 117090646A CN 202311046391 A CN202311046391 A CN 202311046391A CN 117090646 A CN117090646 A CN 117090646A
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Prior art keywords
storage medium
heat
heat storage
steam
outlet
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Inventor
严俊杰
刘泽锋
王朝阳
刘明
范建林
管俊峰
邢勇
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Shaanxi Xinyuan Jieneng Co ltd
Xian Jiaotong University
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Shaanxi Xinyuan Jieneng Co ltd
Xian Jiaotong University
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Priority to CN202311046391.6A priority Critical patent/CN117090646A/en
Publication of CN117090646A publication Critical patent/CN117090646A/en
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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
    • H01M8/24—Grouping of fuel cells, e.g. stacking of fuel cells
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01D—NON-POSITIVE DISPLACEMENT MACHINES OR ENGINES, e.g. STEAM TURBINES
    • F01D15/00—Adaptations of machines or engines for special use; Combinations of engines with devices driven thereby
    • F01D15/10—Adaptations for driving, or combinations with, electric generators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K11/00—Plants characterised by the engines being structurally combined with boilers or condensers
    • F01K11/02—Plants characterised by the engines being structurally combined with boilers or condensers the engines being turbines
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K13/00—General layout or general methods of operation of complete plants
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F01—MACHINES OR ENGINES IN GENERAL; ENGINE PLANTS IN GENERAL; STEAM ENGINES
    • F01K—STEAM ENGINE PLANTS; STEAM ACCUMULATORS; ENGINE PLANTS NOT OTHERWISE PROVIDED FOR; ENGINES USING SPECIAL WORKING FLUIDS OR CYCLES
    • F01K17/00—Using steam or condensate extracted or exhausted from steam engine plant
    • F01K17/02—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic
    • F01K17/025—Using steam or condensate extracted or exhausted from steam engine plant for heating purposes, e.g. industrial, domestic in combination with at least one gas turbine, e.g. a combustion gas turbine
    • 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
    • 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
    • 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
    • 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
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04089—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants
    • H01M8/04119—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying
    • H01M8/04156—Arrangements for control of reactant parameters, e.g. pressure or concentration of gaseous reactants with simultaneous supply or evacuation of electrolyte; Humidifying or dehumidifying with product water removal
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04082—Arrangements for control of reactant parameters, e.g. pressure or concentration
    • H01M8/04201—Reactant storage and supply, e.g. means for feeding, pipes
    • 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
    • H01M8/04—Auxiliary arrangements, e.g. for control of pressure or for circulation of fluids
    • H01M8/04298—Processes for controlling fuel cells or fuel cell systems
    • H01M8/04694—Processes for controlling fuel cells or fuel cell systems characterised by variables to be controlled
    • H01M8/04746—Pressure; Flow
    • 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
    • H01M8/0662—Treatment of gaseous reactants or gaseous residues, e.g. cleaning
    • 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
    • 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
    • H02J3/32—Arrangements for balancing of the load in a network by storage of energy using batteries with converting means
    • 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
    • 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
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01M—PROCESSES OR MEANS, e.g. BATTERIES, FOR THE DIRECT CONVERSION OF CHEMICAL ENERGY INTO ELECTRICAL ENERGY
    • H01M2250/00—Fuel cells for particular applications; Specific features of fuel cell system
    • H01M2250/10—Fuel cells in stationary systems, e.g. emergency power source in plant

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  • Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • General Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
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  • Chemical Kinetics & Catalysis (AREA)
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  • Manufacturing & Machinery (AREA)
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Abstract

The invention discloses a depth peak shaving coal-fired power generation system coupled with RSOC and an operation method thereof. When the power grid is in low electricity consumption, RSOC operates in an electric energy storage mode, the system configuration is reasonably designed, the recovered gas product enters a boiler to be stably combusted, the minimum technical output limit of a unit is broken through, the peak regulation capacity of the unit is increased, bypass working media, residual heat of reaction products and fused salt heat storage are utilized to heat water supply, SCR denitration efficiency under low load is improved while waste heat cascade utilization is realized, and clean and safe combustion at the boiler side and efficient operation at the turbine side under deep peak regulation working conditions are cooperatively realized; when the power consumption of the power grid is high, the RSOC operates in a power generation mode, and the quick load-changing capacity of the unit is improved by flexibly adjusting the operation mode. The invention couples different power generation units, and widens the safe, efficient, flexible and clean operation area of the coal-fired unit through material flow process reconstruction and energy orderly conversion.

Description

Coupled RSOC deep peak shaving coal-fired power generation system and operation method thereof
Technical Field
The invention belongs to the technical field of coal burning, and particularly relates to a depth peak shaving coal-fired power generation system coupled with RSOC and an operation method thereof.
Background
The installation scale of renewable energy sources such as wind energy, solar energy and the like is continuously increased in China, but the intermittent and uncertain characteristics of the renewable energy sources bring great challenges to the safe and stable operation of a power grid. The intrinsic endowment of the resources mainly containing coal in China determines that coal electricity still plays an important role in guaranteeing the energy and electricity safety of China and consuming renewable energy sources in a quite long period. As the peak-valley difference of the power grid is increasingly larger, the power load changes more and more severely and frequently, and the deep peak-shaving operation of the coal-fired unit gradually becomes an operation normal state. The peak regulation capacity of the coal-fired unit is limited by the minimum technical output of the unit, the running stability is poor under low load, and the running energy consumption is high, so that the coal-fired unit becomes one of the current concerns. The current research is mainly focused on the potential of the excavator unit to explore the stable combustion boundary of the coal-fired unit, or the peak shaving depth of the unit is improved at the expense of the economy of the unit, and different power generation units are coupled in the coal-fired power generation system, so that the reasonable design of the energy transfer and conversion mode is one of effective technical routes for improving the peak shaving capability of the unit.
A reversible solid oxide fuel cell (RSOC) is a clean, efficient, flexible energy conversion device having two different modes of operation through which efficient storage and release of electrical energy can be achieved. In the RSOC operation process, electric energy and chemical energy are mutually converted, a higher reaction temperature is needed in the energy storage process, a large amount of high-temperature gas products can be generated in the discharge process, so that the energy flow transmission between the RSOC and the thermodynamic system of the coal-fired unit can be realized through the coupling molten salt heat storage system, and the energy conversion efficiency of the unit is comprehensively improved.
Disclosure of Invention
In order to overcome the problems in the prior art, the invention aims to provide a depth peak regulation coal-fired power generation system coupled with a RSOC and an operation method thereof, wherein the system configuration is reasonably designed by coupling a fused salt heat storage system and a reversible solid oxide fuel cell (RSOC) system, the operation mode of a unit is adjusted, the peak regulation capacity of the unit is increased, the high-efficiency storage of electricity consumption off-peak electric energy can be realized, the electricity consumption off-peak electric energy is rapidly released, bypass working medium, fused salt and reaction product waste heat are recovered to heat boiler water, the SCR denitration efficiency of the boiler under extremely low load is improved, and the operation interval of safe, efficient, flexible and clean operation of the coal-fired unit is widened.
The technical scheme adopted for solving the technical problems is as follows:
a depth peak shaving coal-fired power generation system coupled with RSOC comprises a coal-fired power generation unit thermodynamic system, a reversible solid oxide fuel cell RSOC coupling system and a fused salt heat storage coupling system;
the thermodynamic system of the coal-fired power generation unit comprises: the system comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine medium-pressure cylinder 3, a turbine low-pressure cylinder 4, a generator 5, a condenser 6, a condensate pump 7, a heat storage medium feed water heater 8, a low-pressure heater 9, a deaerator 10, a feed water pump 11, a high-pressure heater 12, a first feed water heater 13, a second feed water heater 14, a bypass steam feed water heater 15 and a bypass working medium pressure reducing valve 16; the superheated steam outlet of the boiler 1 is connected with the steam inlet of the high-pressure cylinder 2 of the turbine through a pipeline, the steam outlet of the high-pressure cylinder 2 of the turbine is connected with the steam inlet of the high-pressure heater 12 through a pipeline, the steam outlet of the high-pressure cylinder 2 of the turbine is connected with the steam inlet of the medium-pressure cylinder 3 of the turbine through the boiler 1, the first-stage steam outlet of the medium-pressure cylinder 3 of the turbine is connected with the steam inlet of the deaerator 10 through a pipeline, the steam outlet of the medium-pressure cylinder 3 of the turbine is connected with the steam inlet of the low-pressure cylinder 4 of the turbine through a pipeline, the steam outlet of the low-pressure cylinder 4 of the turbine is connected with the steam inlet of the low-pressure heater 9 through a pipeline, the steam outlet of the low-pressure cylinder 4 of the turbine is connected with the condenser 6 through a pipeline, the condensed water working medium outlet of the condenser 6 of the condenser is connected with the working medium feed water heater 8 of the condensate pump 7, the condensed water working medium outlet of the medium feed water heater 8 of the low-pressure heater 9 is connected with the condensed water working medium inlet of the deaerator 10 of the low-pressure heater 9 through a pipeline, the deaerator 10 of the condensate water working medium outlet of the low-pressure heater 10 is connected with the high-pressure heater 10 of the medium feed water heater 12 of the high-pressure heater 1 through a pipeline, the high-pressure heater 11 of the turbine and the high-pressure heater 11 of the turbine is connected with the high-pressure water heater 12 through a water heater 11 of the high-pressure heater, the high-pressure heater 11 of the high-pressure heater 11 is connected with the water heater 11 through a water heater, and the high-pressure heater 13 of the high-pressure heater, and the water heater 11 of the high-pressure heater, and the high-pressure heater 11 is connected with the water heater, and the water heater 11;
the reversible solid oxide fuel cell RSOC coupling system comprises an RSOC electric pile 28, a first heat regenerator 30, a second heat regenerator 33, a third heat regenerator 29, a fourth heat regenerator 36, a first three-way mixing valve 31, a second three-way mixing valve 35, a first fan 34, a second fan 38, a first molten salt gas heat exchanger 22, a second molten salt gas heat exchanger 51, a fuel cell unit water pump 37, a first hydrogen storage tank 39, a second hydrogen storage tank 44, a water storage tank 43, a fuel cell unit condenser 40, a fuel cell unit steam-water separator 41, a fuel cell unit dryer 42, a fuel cell unit water supply regulating valve 45, an electrolysis mode oxygen regulating valve 32, a power generation mode oxygen regulating valve 50, a boiler steady burning valve 46, an air exhaust valve 47 and pipelines for connecting various devices; the RSOC stack 28, the first regenerator 30, the second regenerator 33, the third regenerator 29, the fourth regenerator 36, the first three-way mixing valve 31, the second three-way mixing valve 35, the first fan 34, the second fan 38, the first molten salt gas heat exchanger 22, the fuel cell water pump 37, the first hydrogen storage tank 39, the second hydrogen storage tank 44, the water storage tank 43, the fuel cell condenser 40, the fuel cell steam-water separator 41, the fuel cell dryer 42, the fuel cell water supply regulating valve 45, the electrolysis mode oxygen regulating valve 32, and the power generation mode oxygen regulating valve 50 form a fuel cell; the electrolysis working medium water comes from the outlet of the middle pressure cylinder 3 of the steam turbine, is connected with a fuel cell unit through a fuel cell unit water supply regulating valve 45, is sequentially connected with the fuel side of a fourth heat regenerator 36 through pipelines through a fuel cell unit water pump 37, a first fan 34, a fuel side of a second heat regenerator 33 and a fuel side of a third heat regenerator 29, is converged with the working medium water at a second three-way mixing valve 35, enters a fuel inlet end of an RSOC electric pile 28 after passing through the fuel side of a first molten salt gas heat exchanger 22, and enters a fuel outlet pipeline of the RSOC electric pile 28 after passing through a tail gas side of the third heat regenerator 29, a fuel tail gas side of a second feed water heater 14, a fuel cell unit condenser 40, a fuel cell unit steam-water separator 41 and a fuel cell unit dryer 42, and finally is connected with a second hydrogen storage tank 44 to form a fuel closed pipeline, and water separated by the fuel cell unit steam-water separator 41 enters a water storage tank 43 for storage; the external air passes through the second fan 38, the first regenerator 30, the oxygen side of the first molten salt gas heat exchanger 22, and enters the oxygen inlet end of the RSOC electric pile 28, the oxygen at the oxygen outlet end of the RSOC electric pile 28 passes through the exhaust side of the first regenerator 30, and is divided into two paths at the first three-way mixing valve 31, one path passes through the electrolysis mode oxygen regulating valve 32, the exhaust side of the second regenerator 33, the exhaust side of the fourth regenerator 36 and the oxygen exhaust side of the first feedwater heater 13, and finally enters the coal-fired unit boiler through the boiler stable combustion valve 46 or is discharged to the external environment through the air exhaust valve 47, and the other path passes through the power generation mode oxygen regulating valve 50 and the oxygen side of the second molten salt gas heat exchanger 51 and is discharged to the external environment;
the fused salt heat storage coupling system comprises a heat storage medium cold tank 25, a heat storage medium cold tank outlet regulating valve 26, a heat storage medium cold tank outlet pump 27, a heat storage medium bypass steam heater 18, a bypass steam regulating valve 17, a heat storage medium first heat tank 19, a heat storage medium first heat tank outlet regulating valve 20, a heat storage medium first heat tank outlet pump 21, a heat storage medium second heat tank 52, a heat storage medium second heat tank outlet regulating valve 53, a heat storage medium second heat tank outlet pump 54, a heat storage medium power generation mode regulating valve 23 and a heat storage medium three-way mixing valve 24; the heat storage medium inlet of the heat storage medium bypass steam heater 18 is connected with the heat storage medium outlet of the heat storage medium cold tank 25 through a heat storage medium cold tank outlet pump 27 and a heat storage medium cold tank outlet regulating valve 26, the heat storage medium outlet of the heat storage medium bypass steam heater 18 is connected with the heat storage medium inlet of the heat storage medium first heat tank 19 through a pipeline, the steam working medium inlet of the heat storage medium bypass steam heater 18 is connected with the main steam outlet of the boiler 1 through a bypass steam regulating valve 17, and the working medium outlet of the heat storage medium bypass steam heater 18 is connected with the deaerator 10 through a bypass steam feed water heater 15 and a bypass working medium pressure reducing valve 16; the medium outlet of the first molten salt gas heat exchanger 22 is connected with the medium inlet of a heat storage medium cold tank 25 through a heat storage medium three-way mixing valve 24 and a heat storage medium feed water heater 8; the heat storage medium cold tank 25 is connected with a heat storage medium second hot tank 52 through a heat storage medium power generation mode regulating valve 23 and a second molten salt gas heat exchanger 51, and a heat storage medium outlet of the heat storage medium second hot tank 52 is connected with a heat storage medium inlet of the heat storage medium feed water heater 8 through a heat storage medium second hot tank outlet regulating valve 53, a heat storage medium second hot tank outlet pump 54 and a heat storage medium three-way mixing valve 24;
the RSOC stack 28 is connected to the ac-to-dc inverter 48 and the dc-to-ac inverter 55 by cables, the ac-to-dc inverter 48 is connected to the grid by a first switch 49, and the dc-to-ac inverter 55 is connected to the grid by a second switch 56.
The operation method of the depth peak shaving coal-fired power generation system of the coupling RSOC is as follows:
(1) When the electric power of the power grid is excessive, the coal-fired power generation unit is in a deep peak shaving operation mode, the RSOC unit is operated in an electrolysis mode, the first switch 49 is opened, the electric power is converted into direct current through the alternating current-to-direct current inverter 48 and then enters the RSOC unit for storage, and the second fan 38 is opened to flow air into the oxygen inlet end of the RSOC electric pile 28; the power generation mode oxygen regulating valve 50 is closed, the electrolysis mode oxygen regulating valve 32 is opened, oxygen-enriched air at the oxygen outlet end preheats reaction gas through the first heat regenerator 30, the second heat regenerator 33 and the fourth heat regenerator 36, and preheats boiler feed water through the first feed water heater 13, and the oxygen-enriched air after waste heat recovery is beneficial to stable combustion of the boiler, so that the boiler stable combustion valve 46 and the air exhaust valve 47 are regulated, and the oxygen-enriched air after heat exchange is controlled to be conveyed through a pipeline and finally enter a hearth to realize stable combustion of the boiler under low load; the first fan 34 is turned on to lead out hydrogen from the first hydrogen storage tank 39, meanwhile, the fuel cell unit water supply regulating valve 45 and the fuel cell unit water pump 37 are turned on, the rotation speed of the fuel cell unit water pump is regulated, water with proper amount is taken from the outlet of the middle pressure cylinder 3 of the steam turbine, and then is led into the fourth heat regenerator 36, is mixed with the hydrogen in the second three-way mixing valve 35, and finally, the mixed gas flows into the fuel side of the RSOC electric pile 28; the hydrogen generated by electrolysis and the hydrogen input from the front end of the RSOC galvanic pile are regenerated through a third regenerator 29, the unreacted gas is preheated through a second feed water heater 14, and finally the hydrogen and the water are respectively flowed into a second hydrogen storage tank 44 and a water storage tank 43 for storage through a fuel cell condenser 40, a fuel cell steam-water separator 41 and a fuel cell dryer 42; the bypass steam regulating valve 17 is opened, the bypass steam flow is regulated, the heat storage medium is heated in the heat storage medium bypass steam heater 18, the heat storage medium power generation mode regulating valve 23 and the heat storage medium second heat tank outlet regulating valve 53 are closed, the heat storage medium first heat tank outlet regulating valve 20 is opened, the heat storage medium first heat tank outlet pump 21 is started, the heat storage medium flow is regulated, the heat storage medium flowing out of the heat storage medium first heat tank 19 flows through the first molten salt gas heat exchanger 22 to exchange heat with the reaction working medium, the reaction condition required by the electrolysis reaction is created, then the water supply is preheated through the heat storage medium feed water heater 8, meanwhile, the low-pressure cylinder steam is extracted, the working medium extracted due to the electrolysis of the RSOC unit is filled, the working medium working flow of the low-pressure cylinder is increased, the cylinder efficiency of the low-pressure cylinder is improved, and the heat storage medium after the waste heat utilization enters the heat storage medium cold tank 25;
(2) When the power grid electricity load rises rapidly, the RSOC unit operates in a power generation mode, the second switch 56 is opened, electric energy emitted by the RSOC electric pile 28 is converted into alternating current through the direct current-to-alternating current inverter 55 and then is supplied to the power grid, the first fan 34 draws out hydrogen of the first hydrogen storage tank 39, the hydrogen flows into the RSOC electric pile 28 through the second heat regenerator 33 and the third heat regenerator 29 respectively, the oxygen is led into the first heat regenerator 30 through the second fan 38 and then enters the RSOC electric pile 28, and electrochemical reaction occurs between the hydrogen and the power to supply power outwards; the bypass steam regulating valve 17, the electrolysis mode oxygen regulating valve 32, and the power generation mode oxygen regulating valve 50 are regulated for the purposes of: during the rapid load rising period of the coal-fired generator set, the bypass flow of main steam is reduced, the flow of working medium is increased, the heat storage medium is heated by the second molten salt gas heat exchanger 51 at high temperature generated by chemical reaction, the heated air is discharged into the atmosphere, the heat storage medium power generation mode regulating valve 23 and the heat storage medium second heat tank outlet regulating valve 53 are opened, the heat storage medium flows out of the heat storage medium cold tank 25 and is heated by the second molten salt gas heat exchanger 51 and flows through the heat storage medium second heat tank 52, the heat storage medium flow is regulated by the heat storage medium second heat tank outlet regulating valve 53 and the heat storage medium second heat tank outlet pump 54, and the heated air enters the heat storage medium feed water heater 8 to heat water.
Compared with the prior art, the invention has the following advantages:
1. according to the invention, the fused salt heat storage subsystem and the reversible solid oxide fuel cell (RSOC) subsystem are coupled, the system configuration is reasonably designed, the fused salt heat storage subsystem is used for realizing energy flow transmission between the coal-fired power generation thermodynamic system and the RSOC system, the high-efficiency storage of electric energy is realized through the electrolysis process of the RSOC, the extra output of electric energy is realized through the power generation process of the RSOC, the operation mode can be flexibly adjusted according to the power grid dispatching instruction, and the rapid load changing capacity of the coal-fired unit is improved;
2. according to the invention, by reconstructing a material flow path of the coal-fired unit under low-load operation, gas products of the RSOC subsystem are recovered to enter the boiler for stable combustion, so that the operation stability of the boiler under low load is effectively improved, the minimum technical output limit of the unit is broken through, the peak regulation capacity of the unit is increased, and clean and safe combustion on the boiler side and efficient operation on the turbine side under deep peak regulation working conditions are cooperatively realized;
3. the invention designs a closed loop flow path of the working medium in the system, utilizes the bypass working medium, the residual heat of the reaction product and the fused salt to heat the water supply, realizes the comprehensive utilization of the waste heat, improves the exhaust gas temperature of the outlet of the economizer, improves the SCR denitration efficiency under low load, and widens the safe, efficient, clean and stable operation interval of the coal-fired unit.
Drawings
FIG. 1 is a schematic diagram of a coupled RSOC deep peak shaving coal-fired power generation system.
Detailed Description
The invention will be further described with reference to the drawings and embodiments.
As shown in FIG. 1, the depth peak shaving coal-fired power generation system coupled with the RSOC comprises a coal-fired power generation unit thermodynamic system, a reversible solid oxide fuel cell RSOC coupling system and a fused salt heat storage coupling system.
The thermodynamic system of the coal-fired power generation unit comprises: the system comprises a boiler 1, a turbine high-pressure cylinder 2, a turbine medium-pressure cylinder 3, a turbine low-pressure cylinder 4, a generator 5, a condenser 6, a condensate pump 7, a heat storage medium feed water heater 8, a low-pressure heater 9, a deaerator 10, a feed water pump 11, a high-pressure heater 12, a first feed water heater 13, a second feed water heater 14, a bypass steam feed water heater 15 and a bypass working medium pressure reducing valve 16; the superheated steam outlet of the boiler 1 is connected with the steam inlet of the high-pressure cylinder 2 of the turbine through a pipeline, the steam outlet of the high-pressure cylinder 2 of the turbine is connected with the steam inlet of the high-pressure heater 12 through a pipeline, the steam outlet of the high-pressure cylinder 2 of the turbine is connected with the steam inlet of the medium-pressure cylinder 3 of the turbine through the boiler 1, the first-stage steam outlet of the medium-pressure cylinder 3 of the turbine is connected with the steam inlet of the deaerator 10 through a pipeline, the steam outlet of the medium-pressure cylinder 3 of the turbine is connected with the steam inlet of the low-pressure cylinder 4 of the turbine through a pipeline, the steam outlet of the low-pressure cylinder 4 of the turbine is connected with the steam inlet of the low-pressure heater 9 through a pipeline, the steam outlet of the low-pressure cylinder 4 of the turbine is connected with the condenser 6 through a pipeline, the condensed water working medium outlet of the condenser 6 of the condenser is connected with the working medium feed water heater 8 of the condensate pump 7, the condensed water working medium outlet of the medium feed water heater 8 of the low-pressure heater 9 is connected with the condensed water working medium inlet of the deaerator 10 of the low-pressure heater 9 through a pipeline, the deaerator 10 of the condensate water working medium outlet of the low-pressure heater 10 is connected with the high-pressure heater 10 of the medium feed water heater 12 of the high-pressure heater 1 through a pipeline, the high-pressure heater 11 of the turbine and the high-pressure heater 11 of the turbine is connected with the high-pressure water heater 12 through a water heater 11 of the high-pressure heater, the high-pressure heater 11 of the high-pressure heater 11 is connected with the water heater 11 through a water heater, and the high-pressure heater 13 of the high-pressure heater, and the water heater 11 of the high-pressure heater, and the high-pressure heater 11 is connected with the water heater, and the water heater 11;
the reversible solid oxide fuel cell RSOC coupling system comprises an RSOC stack 28, a first regenerator 30, a second regenerator 33, a third regenerator 29, a fourth regenerator 36, a first three-way mixing valve 31, a second three-way mixing valve 35, a first fan 34, a second fan 38, a first molten salt gas heat exchanger 22, a second molten salt gas heat exchanger 51, a fuel cell water pump 37, a first hydrogen storage tank 39, a second hydrogen storage tank 44, a water storage tank 43, a fuel cell condenser 40, a fuel cell steam-water separator 41, a fuel cell dryer 42, a fuel cell water supply regulating valve 45, an electrolysis mode oxygen regulating valve 32, a power generation mode oxygen regulating valve 50, a boiler flame stabilizing valve 46, an air exhaust valve 47 and pipelines for connecting various devices; the RSOC stack 28, the first regenerator 30, the second regenerator 33, the third regenerator 29, the fourth regenerator 36, the first three-way mixing valve 31, the second three-way mixing valve 35, the first fan 34, the second fan 38, the first molten salt gas heat exchanger 22, the fuel cell water pump 37, the first hydrogen storage tank 39, the second hydrogen storage tank 44, the water storage tank 43, the fuel cell condenser 40, the fuel cell steam-water separator 41, the fuel cell dryer 42, the fuel cell water supply regulating valve 45, the electrolysis mode oxygen regulating valve 32, and the power generation mode oxygen regulating valve 50 form a fuel cell; the electrolysis working medium water comes from the outlet of the middle pressure cylinder 3 of the steam turbine, is connected with a fuel cell unit through a fuel cell unit water supply regulating valve 45, is sequentially connected with the fuel side of a fourth heat regenerator 36 through pipelines through a fuel cell unit water pump 37, a first fan 34, a fuel side of a second heat regenerator 33 and a fuel side of a third heat regenerator 29, is converged with the working medium water at a second three-way mixing valve 35, enters a fuel inlet end of an RSOC electric pile 28 after passing through the fuel side of a first molten salt gas heat exchanger 22, and enters a fuel outlet pipeline of the RSOC electric pile 28 after passing through a tail gas side of the third heat regenerator 29, a fuel tail gas side of a second feed water heater 14, a fuel cell unit condenser 40, a fuel cell unit steam-water separator 41 and a fuel cell unit dryer 42, and finally is connected with a second hydrogen storage tank 44 to form a fuel closed pipeline, and water separated by the fuel cell unit steam-water separator 41 enters a water storage tank 43 for storage; the external air passes through the second fan 38, the first regenerator 30, the oxygen side of the first molten salt gas heat exchanger 22, and enters the oxygen inlet end of the RSOC electric pile 28, the oxygen at the oxygen outlet end of the RSOC electric pile 28 passes through the exhaust side of the first regenerator 30, and is split into two paths at the first three-way mixing valve 31, one path passes through the electrolysis mode oxygen regulating valve 32, the exhaust side of the second regenerator 33, the exhaust side of the fourth regenerator 36, and the oxygen exhaust side of the first feedwater heater 13, and finally enters the coal-fired unit boiler through the boiler stable combustion valve 46 or is discharged to the external environment through the air exhaust valve 47, and the other path passes through the power generation mode oxygen regulating valve 50 and the oxygen side of the second molten salt gas heat exchanger 51 and is discharged to the external environment. The RSOC stack 28 is connected to the ac-to-dc inverter 48 and the dc-to-ac inverter 55 by cables, the ac-to-dc inverter 48 is connected to the grid by a first switch 49, and the dc-to-ac inverter 55 is connected to the grid by a second switch 56.
The fused salt heat storage coupling system comprises a heat storage medium cold tank 25, a heat storage medium cold tank outlet regulating valve 26, a heat storage medium cold tank outlet pump 27, a heat storage medium bypass steam heater 18, a bypass steam regulating valve 17, a heat storage medium first heat tank 19, a heat storage medium first heat tank outlet regulating valve 20, a heat storage medium first heat tank outlet pump 21, a heat storage medium second heat tank 52, a heat storage medium second heat tank outlet regulating valve 53, a heat storage medium second heat tank outlet pump 54, a heat storage medium power generation mode regulating valve 23 and a heat storage medium three-way mixing valve 24; the heat storage medium inlet of the heat storage medium bypass steam heater 18 is connected with the heat storage medium outlet of the heat storage medium cold tank 25 through a heat storage medium cold tank outlet pump 27 and a heat storage medium cold tank outlet regulating valve 26, the heat storage medium outlet of the heat storage medium bypass steam heater 18 is connected with the heat storage medium inlet of the heat storage medium first heat tank 19 through a pipeline, the steam working medium inlet of the heat storage medium bypass steam heater 18 is connected with the main steam outlet of the boiler 1 through a bypass steam regulating valve 17, and the working medium outlet of the heat storage medium bypass steam heater 18 is connected with the deaerator 10 through a bypass steam feed water heater 15 and a bypass working medium pressure reducing valve 16; the medium outlet of the first molten salt gas heat exchanger 22 is connected with the medium inlet of a heat storage medium cold tank 25 through a heat storage medium three-way mixing valve 24 and a heat storage medium feed water heater 8; the heat storage medium cold tank 25 is connected with the heat storage medium second hot tank 52 through the heat storage medium power generation mode regulating valve 23 and the second molten salt gas heat exchanger 51, and the heat storage medium outlet of the heat storage medium second hot tank 52 is connected with the heat storage medium inlet of the heat storage medium feed water heater 8 through the heat storage medium second hot tank outlet regulating valve 53, the heat storage medium second hot tank outlet pump 54 and the heat storage medium three-way mixing valve 24.
As the RSOC is a clean, efficient and flexible energy conversion device, the RSOC has two different operation modes, and the RSOC can realize efficient storage and release of electric energy through the different operation modes. In the RSOC operation process, electric energy and chemical energy are mutually converted, a higher reaction temperature is needed in the energy storage process, a large amount of high-temperature gas products can be generated in the discharge process, so that the energy flow transmission between the RSOC and the thermodynamic system of the coal-fired unit can be realized through the coupling molten salt heat storage system, and the energy conversion efficiency of the unit is comprehensively improved.
When the electric power of the power grid is excessive, the coal-fired power generation unit is in a deep peak shaving operation mode, the RSOC unit is operated in an electrolysis mode, the first switch 49 is opened, the electric power is converted into direct current through the alternating current-to-direct current inverter 48 and then enters the RSOC unit for storage, and the second fan 38 is opened to flow air into the oxygen inlet end of the RSOC electric pile 28; closing the power generation mode oxygen regulating valve 50, opening the electrolysis mode oxygen regulating valve 32, and preheating the reaction gas by oxygen-enriched air at the oxygen outlet end through the first heat regenerator 30, the second heat regenerator 33 and the fourth heat regenerator 36 and preheating boiler feed water through the first feed water heater 13; the first fan 34 is turned on to lead out hydrogen from the first hydrogen storage tank 39, meanwhile, the fuel cell unit water supply regulating valve 45 and the fuel cell unit water pump 37 are turned on, the rotation speed of the fuel cell unit water pump is regulated, water with proper amount is taken from the outlet of the middle pressure cylinder 3 of the steam turbine, and then is led into the fourth heat regenerator 36, is mixed with the hydrogen in the second three-way mixing valve 35, and finally, the mixed gas flows into the fuel side of the RSOC electric pile 28; the hydrogen generated by electrolysis and the hydrogen input from the front end of the RSOC galvanic pile are regenerated through a third regenerator 29, the unreacted gas is preheated through a second feed water heater 14, and finally the hydrogen and the water are respectively flowed into a second hydrogen storage tank 44 and a water storage tank 43 for storage through a fuel cell condenser 40, a fuel cell steam-water separator 41 and a fuel cell dryer 42; in addition, because when the coal-fired generating set is in deep peak regulation operation, the problems of unstable flameout of a boiler burner, water wall tube explosion caused by uneven heat load of a hearth and the like easily occur, the safe and stable operation of the set is seriously threatened, so that the oxygen-enriched air after waste heat recovery is continuously utilized, the boiler stable combustion valve 46 and the air exhaust valve 47 are regulated, the oxygen-enriched air after heat exchange is controlled to be conveyed through a pipeline and finally enter the hearth to realize stable combustion under low load of the boiler, and the air exhaust valve 47 is arranged to avoid the problems of water wall vaporization or hydrodynamic safety caused by overhigh heat exchange quantity of the hearth.
The bypass steam regulating valve 17 is opened, the bypass steam flow is regulated, the heat storage medium is heated in the heat storage medium bypass steam heater 18, the heat storage medium power generation mode regulating valve 23 and the heat storage medium second heat tank outlet regulating valve 53 are closed, the heat storage medium first heat tank outlet regulating valve 20 is opened, the heat storage medium first heat tank outlet pump 21 is started, the heat storage medium flow is regulated, the heat storage medium flowing out of the heat storage medium first heat tank 19 flows through the first molten salt gas heat exchanger 22 to exchange heat with the reaction working medium, the reaction condition required by the electrolysis reaction is created, then the water supply is preheated through the heat storage medium feed water heater 8, meanwhile, the low-pressure cylinder steam is extracted, the working medium extracted due to the electrolysis of the RSOC unit is filled, the working medium working flow of the low-pressure cylinder is increased, the cylinder efficiency of the low-pressure cylinder is improved, and the heat storage medium after the waste heat utilization enters the heat storage medium cold tank 25;
when the power grid electricity load rises rapidly, taking actual operation data of a certain 600MW grade once-reheat coal-fired generator set as an example, the output of the generator set cannot respond rapidly due to the characteristics of large delay inertia and the like of a boiler system, when the generator set receives a load rising instruction of 1% rated load/min of the power grid, the response time is in the order of ten seconds, the power deviation of 3-5MW appears at the initial stage of load rising, and along with the improvement of the load rising rate, the response time and the power deviation at the initial stage of load changing are increased, so that the operation of the generator set is influenced. The RSOC system is coupled and operated in a power generation mode, so that the quick load changing capacity of the unit can be improved, and the tracking performance of the unit on load instructions is improved. When the RSOC unit is operated in a power generation mode, the second switch 56 is turned on, electric energy emitted by the RSOC electric pile 28 is converted into alternating current through the direct current-to-alternating current inverter 55, then power is supplied to a power grid, hydrogen in the first hydrogen storage tank 39 is led out by the first fan 34, flows into the RSOC electric pile 28 through the second heat regenerator 33 and the third heat regenerator 29 respectively, oxygen is led in by the second fan 38, flows into the RSOC electric pile 28 after flowing into the first heat regenerator 30, and electrochemical reaction occurs between the two to supply power outwards; the bypass steam regulating valve 17, the electrolysis mode oxygen regulating valve 32, and the power generation mode oxygen regulating valve 50 are regulated for the purposes of: during the rapid load rising period of the coal-fired generator set, the bypass flow of main steam is reduced, the flow of working medium is increased, the heat storage medium is heated by the second molten salt gas heat exchanger 51 at high temperature generated by chemical reaction, the heated air is discharged into the atmosphere, the heat storage medium power generation mode regulating valve 23 and the heat storage medium second heat tank outlet regulating valve 53 are opened, the heat storage medium flows out of the heat storage medium cold tank 25 and is heated by the second molten salt gas heat exchanger 51 and flows through the heat storage medium second heat tank 52, the heat storage medium flow is regulated by the heat storage medium second heat tank outlet regulating valve 53 and the heat storage medium second heat tank outlet pump 54, and the heated air enters the heat storage medium feed water heater 8 to heat water.
When the power grid is in low electricity consumption, RSOC (reactive power operation) is in an electric energy storage mode, the system configuration is reasonably designed, a recovered gas product enters a boiler to be stably combusted, the minimum technical output limit of a unit is broken through, the peak regulation capacity of the unit is increased, bypass working media, residual heat of reaction products and fused salt heat storage are utilized to heat water supply, SCR (selective catalytic reduction) denitration efficiency under low load is improved while waste heat cascade utilization is realized, and clean and safe combustion on the boiler side and efficient operation on the turbine side under the deep peak regulation working condition are cooperatively realized; when the power consumption of the power grid is high, the RSOC operates in a power generation mode, and the quick load-changing capacity of the unit is improved by flexibly adjusting the operation mode. The invention couples different power generation units, and widens the safe, efficient, flexible and clean operation area of the coal-fired unit through material flow process reconstruction and energy orderly conversion.

Claims (2)

1. A depth peak shaving coal-fired power generation system of coupling RSOC is characterized in that: the system comprises a thermodynamic system of the coal-fired power generation unit, a reversible solid oxide fuel cell (RSOC) coupling system and a fused salt heat storage coupling system;
the thermodynamic system of the coal-fired power generation unit comprises: the system comprises a boiler (1), a turbine high-pressure cylinder (2), a turbine medium-pressure cylinder (3), a turbine low-pressure cylinder (4), a generator (5), a condenser (6), a condensate pump (7), a heat storage medium feed water heater (8), a low-pressure heater (9), a deaerator (10), a feed water pump (11), a high-pressure heater (12), a first feed water heater (13), a second feed water heater (14), a bypass steam feed water heater (15) and a bypass working medium pressure reducing valve (16); the superheated steam outlet of the boiler (1) is connected with the steam inlet of the high-pressure cylinder (2) of the steam turbine through a pipeline, the steam outlet of the high-pressure cylinder (2) of the steam turbine is connected with the steam inlet of the high-pressure heater (12) through a pipeline, the steam outlet of the high-pressure cylinder (2) of the steam turbine is connected with the steam inlet of the medium-pressure cylinder (3) of the steam turbine through the boiler (1), the first-stage steam outlet of the medium-pressure cylinder (3) of the steam turbine is connected with the steam inlet of the high-pressure heater (12) through a pipeline, the second-stage steam outlet is connected with the steam inlet of the deaerator (10) through a pipeline, the steam outlet of the medium-pressure cylinder (3) of the steam turbine is connected with the steam inlet of the low-pressure heater (4) through a pipeline, the steam outlet of the low-pressure cylinder (4) of the steam turbine is connected with the steam inlet of the condenser (6) through a pipeline, the condensate outlet of the condenser (6) is connected with the inlet of the medium feed water heater (8) through a condensate pump (7) and the condensate water heater (8) is connected with the low-pressure heater (9) of the low-pressure heater (9) through a pipeline, the water supply working medium outlet of the deaerator (10) is connected with the water supply working medium inlet of the high-pressure heater (12) through a water supply pump (11), the water supply inlet of the boiler (1) is connected with the water supply working medium outlet of the high-pressure heater (12) through a first water supply heater (13), a second water supply heater (14) and a bypass steam water supply heater (15), and the turbine high-pressure cylinder (2), the turbine medium-pressure cylinder (3) and the turbine low-pressure cylinder (4) are coaxial and connected to a power grid through a generator (5);
the reversible solid oxide fuel cell RSOC coupling system comprises an RSOC electric pile (28), a first heat regenerator (30), a second heat regenerator (33), a third heat regenerator (29), a fourth heat regenerator (36), a first three-way mixing valve (31), a second three-way mixing valve (35), a first fan (34), a second fan (38), a first fused salt gas heat exchanger (22), a second fused salt gas heat exchanger (51), a fuel cell unit water pump (37), a first hydrogen storage tank (39), a second hydrogen storage tank (44), a water storage tank (43), a fuel cell unit condenser (40), a fuel cell unit steam-water separator (41), a fuel cell unit dryer (42), a fuel cell unit water supply regulating valve (45), an electrolysis mode oxygen regulating valve (32), a power generation mode oxygen regulating valve (50), a boiler stable combustion valve (46), an air exhaust valve (47) and pipelines for connecting various devices; the RSOC electric pile (28), the first regenerator (30), the second regenerator (33), the third regenerator (29), the fourth regenerator (36), the first three-way mixing valve (31), the second three-way mixing valve (35), the first fan (34), the second fan (38), the first molten salt gas heat exchanger (22), the fuel cell unit water pump (37), the first hydrogen storage tank (39), the second hydrogen storage tank (44), the water storage tank (43), the fuel cell unit condenser (40), the fuel cell unit steam-water separator (41), the fuel cell unit dryer (42), the fuel cell unit water supply regulating valve (45), the electrolysis mode oxygen regulating valve (32) and the power generation mode oxygen regulating valve (50) form a fuel cell unit; the electrolysis working medium water comes from an outlet of a middle pressure cylinder (3) of the steam turbine, a fuel cell unit water supply regulating valve (45) is connected with the fuel cell unit, a fuel side of a fourth heat regenerator (36) is sequentially connected through a fuel cell unit water pump (37) and a pipeline, reaction hydrogen is sequentially connected with a second hydrogen storage tank (44) through a pipeline connected with the fuel side of a first fan (34), a second heat regenerator (33) and the fuel side of a third heat regenerator (29) at a second three-way mixing valve (35), the water enters a fuel inlet end of an RSOC electric pile (28) after passing through the fuel side of a first molten salt gas heat exchanger (22), a fuel outlet pipeline of the RSOC electric pile (28) sequentially passes through a tail gas side of the third heat regenerator (29), a fuel tail gas side of a second feed water heater (14), a fuel cell unit condenser (40), a fuel cell unit steam-water separator (41) and a fuel cell unit dryer (42) and finally is connected with the second hydrogen storage tank (44) to form a fuel closed pipeline, and the water separated by the fuel cell unit separator (41) enters a water storage tank (43) to be stored; the external air passes through the second fan (38), the first heat regenerator (30), the oxygen side of the first molten salt gas heat exchanger (22) and enters the oxygen inlet end of the RSOC electric pile (28), the oxygen at the oxygen outlet end of the RSOC electric pile (28) passes through the tail gas side of the first heat regenerator (30), and is divided into two paths at the first three-way mixing valve (31), one path passes through the electrolysis mode oxygen regulating valve (32), the tail gas side of the second heat regenerator (33), the tail gas side of the fourth heat regenerator (36) and the oxygen tail gas side of the first feed water heater (13) and finally enters the coal-fired unit boiler through the boiler stable combustion valve (46) or is discharged to the external environment through the air exhaust valve (47), and the other path passes through the power generation mode oxygen regulating valve (50) and the oxygen side of the second molten salt gas heat exchanger (51);
the fused salt heat storage coupling system comprises a heat storage medium cold tank (25), a heat storage medium cold tank outlet regulating valve (26), a heat storage medium cold tank outlet pump (27), a heat storage medium bypass steam heater (18), a bypass steam regulating valve (17), a heat storage medium first heat tank (19), a heat storage medium first heat tank outlet regulating valve (20), a heat storage medium first heat tank outlet pump (21), a heat storage medium second heat tank (52), a heat storage medium second heat tank outlet regulating valve (53), a heat storage medium second heat tank outlet pump (54), a heat storage medium power generation mode regulating valve (23) and a heat storage medium three-way mixing valve (24); the heat storage medium inlet of the heat storage medium bypass steam heater (18) is connected with the heat storage medium outlet of the heat storage medium cold tank (25) through a heat storage medium cold tank outlet pump (27) and a heat storage medium cold tank outlet regulating valve (26), the heat storage medium outlet of the heat storage medium bypass steam heater (18) is connected with the heat storage medium inlet of the heat storage medium first heat tank (19) through a pipeline, the steam working medium inlet of the heat storage medium bypass steam heater (18) is connected with the main steam outlet of the boiler (1) through a bypass steam regulating valve (17), and the working medium outlet of the heat storage medium bypass steam heater (18) is connected with the deaerator (10) through a bypass steam feed water heater (15) and a bypass working medium pressure reducing valve (16); the medium outlet of the first molten salt gas heat exchanger (22) is connected with the medium inlet of a first molten salt gas heat exchanger (22) through a first molten salt gas heat exchanger outlet pump (21) and a first molten salt gas heat exchanger outlet regulating valve (20), and the medium outlet of the first molten salt gas heat exchanger (22) is connected with the heat storage medium inlet of a heat storage medium cold tank (25) through a three-way heat storage medium mixing valve (24) and a heat storage medium feed water heater (8); the heat storage medium cold tank (25) is connected with the heat storage medium second heat tank (52) through a heat storage medium power generation mode regulating valve (23) and a second molten salt gas heat exchanger (51), and a heat storage medium outlet of the heat storage medium second heat tank (52) is connected with a heat storage medium inlet of the heat storage medium feed water heater (8) through a heat storage medium second heat tank outlet regulating valve (53), a heat storage medium second heat tank outlet pump (54) and a heat storage medium three-way mixing valve (24);
the RSOC pile (28) is connected with an alternating current-direct current inverter (48) and a direct current-alternating current inverter (55) through cables, the alternating current-direct current inverter (48) is connected with a power grid through a first switch (49), and the direct current-alternating current inverter (55) is connected with the power grid through a second switch (56).
2. The method of operating a coupled RSOC deep peak shaving coal fired power generation system of claim 1, comprising the steps of:
(1) When the electric energy of the power grid is excessive, the coal-fired power generation unit is in a deep peak shaving operation mode, the RSOC unit is operated in an electrolysis mode, a first switch (49) is opened, the electric energy is converted into direct current through an alternating current-to-direct current inverter (48) and then enters the RSOC unit for storage, and a second fan (38) is opened to enable air to flow into an oxygen inlet end of the RSOC electric pile (28); closing an oxygen regulating valve (50) in a power generation mode, opening an oxygen regulating valve (32) in an electrolysis mode, preheating reaction gas by oxygen-enriched air at an oxygen outlet end through a first heat regenerator (30), a second heat regenerator (33) and a fourth heat regenerator (36), preheating boiler feed water through a first feed water heater (13), and ensuring stable combustion of a boiler by the oxygen-enriched air after waste heat recovery, so that a boiler stable combustion valve (46) and an air exhaust valve (47) are regulated, and the oxygen-enriched air after heat exchange is controlled to be conveyed through a pipeline and finally enter a hearth to realize stable combustion of the boiler under low load; the first fan (34) is opened to lead out hydrogen from the first hydrogen storage tank (39), the fuel cell water supply regulating valve (45) and the fuel cell water pump (37) are opened, the rotation speed of the fuel cell water pump is regulated, the water with proper quantity is taken from the outlet of the middle pressure cylinder (3) of the steam turbine and is introduced into the fourth heat regenerator (36), then the water is mixed with the hydrogen in the second three-way mixing valve (35), and finally the mixed gas flows into the fuel side of the RSOC electric pile (28); the hydrogen generated by electrolysis and the hydrogen input from the front end of the RSOC galvanic pile are regenerated through a third regenerator (29), the water supply is preheated through a second water supply heater (14), and finally the hydrogen and the water are respectively flowed into a second hydrogen storage tank (44) and a water storage tank (43) for storage through a fuel cell condenser (40), a fuel cell steam-water separator (41) and a fuel cell dryer (42); the bypass steam regulating valve (17) is opened, the bypass steam flow is regulated, the heat storage medium is heated in the heat storage medium bypass steam heater (18), the heat storage medium power generation mode regulating valve (23) and the heat storage medium second heat tank outlet regulating valve (53) are closed, the heat storage medium first heat tank outlet regulating valve (20) is opened, the heat storage medium first heat tank outlet pump (21) is started, the heat storage medium flow is regulated, the heat storage medium flowing out of the heat storage medium first heat tank (19) flows through the first fused salt gas heat exchanger (22) to exchange heat with the reaction working medium, reaction conditions required by the electrolysis reaction are created, then the heat storage medium preheats the water supply through the heat storage medium feed water heater (8), meanwhile, the low-pressure cylinder steam extraction is extruded, the heat storage working medium extracted due to the RSOC unit electrolysis is filled, the work working medium flow of the low-pressure cylinder is increased, the efficiency of the low-pressure cylinder is improved, and the heat storage medium after the waste heat utilization enters the heat storage medium cold tank (25);
(2) When the power grid electricity load rises rapidly, the RSOC unit operates in a power generation mode, a second switch (56) is opened, electric energy generated by the RSOC electric pile (28) is converted into alternating current through a direct current-alternating current inverter (55) and then is supplied to the power grid, hydrogen in a first hydrogen storage tank (39) is led out by a first fan (34), flows into the RSOC electric pile (28) through a second heat regenerator (33) and a third heat regenerator (29) respectively, oxygen is led in by a second fan (38) and enters the RSOC electric pile (28) after flowing into the first heat regenerator (30), and electrochemical reaction occurs between the two to supply power outwards; the bypass steam regulating valve (17), the electrolysis mode oxygen regulating valve (32) and the power generation mode oxygen regulating valve (50) are regulated for the purposes of: during the rapid load rising period of the coal-fired generator set, the bypass flow of the main steam is reduced, the flow of working medium is increased, the heat storage medium is heated by utilizing high temperature generated by chemical reaction through the second molten salt gas heat exchanger (51), heated air is discharged into the atmosphere, the heat storage medium power generation mode regulating valve (23) and the heat storage medium second hot tank outlet regulating valve (53) are opened, the heat storage medium flows out of the heat storage medium cold tank (25) and is heated through the second molten salt gas heat exchanger (51), flows through the heat storage medium second hot tank (52), the heat storage medium flow is regulated by the heat storage medium second hot tank outlet regulating valve (53) and the heat storage medium second hot tank outlet pump (54), and the heat storage medium enters the heat storage medium feed water heater (8) to heat feed water.
CN202311046391.6A 2023-08-18 2023-08-18 Coupled RSOC deep peak shaving coal-fired power generation system and operation method thereof Pending CN117090646A (en)

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