CN114109547B - Coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage and operation method - Google Patents
Coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage and operation method Download PDFInfo
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- CN114109547B CN114109547B CN202111205675.6A CN202111205675A CN114109547B CN 114109547 B CN114109547 B CN 114109547B CN 202111205675 A CN202111205675 A CN 202111205675A CN 114109547 B CN114109547 B CN 114109547B
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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
- F01K25/00—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for
- F01K25/08—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours
- F01K25/10—Plants or engines characterised by use of special working fluids, not otherwise provided for; Plants operating in closed cycles and not otherwise provided for using special vapours the vapours being cold, e.g. ammonia, carbon dioxide, ether
- F01K25/103—Carbon dioxide
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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
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B35/00—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for
- F04B35/04—Piston pumps specially adapted for elastic fluids and characterised by the driving means to their working members, or by combination with, or adaptation to, specific driving engines or motors, not otherwise provided for the means being electric
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F04—POSITIVE - DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS FOR LIQUIDS OR ELASTIC FLUIDS
- F04B—POSITIVE-DISPLACEMENT MACHINES FOR LIQUIDS; PUMPS
- F04B41/00—Pumping installations or systems specially adapted for elastic fluids
- F04B41/02—Pumping installations or systems specially adapted for elastic fluids having reservoirs
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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
- F22D11/00—Feed-water supply not provided for in other main groups
- F22D11/02—Arrangements of feed-water pumps
- F22D11/06—Arrangements of feed-water pumps for returning condensate to boiler
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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
- Y02E60/16—Mechanical energy storage, e.g. flywheels or pressurised fluids
Abstract
The invention discloses a peak regulation system of a coal-fired power plant based on supercritical carbon dioxide energy storage and an operation method, wherein the supercritical carbon dioxide energy storage system is established on an existing steam turbine steam cycle power generation system, high-pressure high-temperature carbon dioxide at an outlet of a compressor in the supercritical carbon dioxide energy storage system enters a first heat exchanger to heat condensate water, the temperature of the condensate water is improved, the heat exchange temperature difference in a regenerator is reduced, irreversible loss in the heat exchange process is reduced, the energy efficiency of a unit is improved, and meanwhile, compression heat in the process of compressing carbon dioxide is recovered, and heat waste is reduced.
Description
Technical Field
The invention belongs to the technical field of supercritical carbon dioxide energy storage, and particularly relates to a coal-fired power plant peak regulation system based on supercritical carbon dioxide energy storage and an operation method.
Background
In recent years, the installed capacity of new energy power generation such as wind energy and light energy is rapidly increased, the installed capacity of new energy in partial areas is far more than the capacity of new energy in the areas, meanwhile, because wind energy and light energy have the characteristics of intermittence and volatility, the regulation and control are difficult, the safe operation of a power grid can be influenced by large-scale grid connection, and the peak regulation requirements on the power generation side of the power grid are higher and higher. Energy storage technology is an effective approach to solve the above problems. The existing energy storage technology applied on a large scale comprises pumped storage and compressed air energy storage, and the pumped storage has high requirements on water source conditions and is difficult to be widely applied and popularized; compressed air energy storage relies on underground gas storage caverns and fossil fuel combustion, and energy storage density is low.
Disclosure of Invention
The invention aims to overcome the defects of the prior art, and provides a coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage and an operation method thereof, so as to solve the problems of difficulty in peak shaving and the like in the prior art and improve the capability of a user for receiving intermittent energy sources.
In order to achieve the purpose, the invention is realized by adopting the following technical scheme:
the peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage comprises a boiler and a carbon dioxide compressor, wherein the steam output end of the boiler is connected with the steam input end of a steam turbine, the steam exhaust end of the steam turbine is connected to a condenser, the condensed water output end of the condenser is connected to a cold side inlet of a first heat exchanger, a cold side outlet of the first heat exchanger is connected to a water side inlet of a heat regenerator, and the water side outlet of the heat regenerator is connected with the boiler;
the outlet of the carbon dioxide compressor is connected with the hot side inlet of the first heat exchanger, the hot side outlet of the first heat exchanger is connected with the supercritical carbon dioxide high-pressure storage tank, the outlet of the supercritical carbon dioxide high-pressure storage tank is connected with the cold side inlet of the second heat exchanger, the cold side outlet of the second heat exchanger is connected with the turbine, the outlet of the turbine is connected with the supercritical carbon dioxide low-pressure storage tank, and the outlet of the supercritical carbon dioxide low-pressure storage tank is connected with the inlet of the carbon dioxide compressor;
the steam extraction output by the steam turbine is divided into a first steam extraction pipeline and a second steam extraction pipeline, the first steam extraction pipeline is connected with a hot side inlet of the heat regenerator, the second steam extraction pipeline is connected with a hot side inlet of the second heat exchanger, and a hot side outlet of the second heat exchanger is communicated with the steam side of the heat regenerator;
the power output end of the turbine is connected with a first generator, and the power output end of the turbine is connected with a second generator.
Preferably, a condensate pump is arranged on a connecting pipeline of the condenser and the cold side inlet of the first heat exchanger.
Preferably, a water feed pump is arranged between the cold side outlet of the first heat exchanger and the water side inlet of the regenerator.
Preferably, a cooler is arranged on the connecting pipeline of the transparent and supercritical carbon dioxide low-pressure storage tank.
Preferably, a third electric stop valve is arranged on a connecting pipeline of the cooler and the supercritical carbon dioxide low-pressure storage tank; and a fourth electric stop valve is arranged on a connecting pipeline of the supercritical carbon dioxide low-pressure storage tank and the carbon dioxide compressor.
Preferably, an electric throttle valve is arranged on the cold side inlet connecting pipeline of the supercritical carbon dioxide high-pressure storage tank and the second heat exchanger.
Preferably, a second electric stop valve is arranged on a connecting pipeline between the hot side outlet of the first heat exchanger and the supercritical carbon dioxide high-pressure storage tank.
Preferably, a first electric stop valve is arranged on the second steam extraction pipeline.
Preferably, the power output end of the carbon dioxide compressor is connected with a motor.
The operation method of the coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage is characterized in that,
in a normal working state, the steam of the boiler is output to a steam turbine, the steam turbine drives a first generator to generate power, and the exhaust steam after the steam turbine does work is cooled into condensed water through a condenser and flows back to the boiler;
when the generating capacity of the generator is reduced, carbon dioxide in the supercritical carbon dioxide low-pressure storage tank is transmitted to a carbon dioxide compressor, the generated electric capacity of the first generator drives the carbon dioxide compressor to do work, the carbon dioxide compressor compresses the carbon dioxide to a preset pressure and then outputs the carbon dioxide to the supercritical carbon dioxide high-pressure storage tank, and compression heat generated in the compression process heats condensation water output from a condensation water pump through a first heat exchanger;
when the generating capacity of the generator is increased, carbon dioxide output by the supercritical carbon dioxide high-pressure storage tank flows into the cold side of the second heat exchanger, exchanges heat with high-temperature and high-pressure steam from the steam turbine, the heated carbon dioxide is input into the turbine from the second heat exchanger, work is done on the turbine, and the carbon dioxide output from the turbine is stored in the supercritical carbon dioxide low-pressure storage tank.
Compared with the prior art, the invention has the following beneficial effects:
the invention discloses a coal-fired power plant peak regulation system based on supercritical carbon dioxide energy storage, which is characterized in that a supercritical carbon dioxide energy storage system is built on an existing steam turbine steam cycle power generation system, high-pressure high-temperature carbon dioxide at the outlet of a compressor in the supercritical carbon dioxide energy storage system enters a first heat exchanger to heat condensate water, the temperature of the condensate water is increased, the heat exchange temperature difference in a heat regenerator is reduced, irreversible loss in the heat exchange process is reduced, the energy efficiency of a unit is improved, and meanwhile, compression heat in the process of compressing carbon dioxide is recovered, so that heat waste is reduced. The system provided by the invention couples the supercritical carbon dioxide energy storage system with the steam turbine steam cycle power generation system, and realizes full gradient peak shaving of the coal-fired power plant on the premise of ensuring that the turbine unit runs safely and efficiently under rated load. The density of the supercritical carbon dioxide is close to that of the liquid, the viscosity is close to that of the gas, the supercritical carbon dioxide has good fluidity and transmission characteristics, the supercritical carbon dioxide is used for replacing air as an energy storage medium, the energy storage density is greatly improved, the scale of a storage system is obviously reduced, and the cost is reduced. Further, the high-pressure low-temperature carbon dioxide in the energy release stage of the supercritical carbon dioxide energy storage system is heated by utilizing the high pressure and high Wen Chouqi in the steam turbine cylinder, so that the working capacity of the carbon dioxide is improved, and the generating capacity of the unit is increased.
The invention also discloses an operation method of the peak regulation system of the coal-fired power plant based on supercritical carbon dioxide energy storage, which comprises the steps of utilizing a carbon dioxide compressor to compress supercritical carbon dioxide to consume work of a steam turbine during electricity consumption low-peak period, and maintaining stable combustion in a boiler; in the electricity consumption peak period, the supercritical high-pressure carbon dioxide drives the turbine to apply work to drive the generator to generate electricity so as to meet the electricity consumption requirement.
Drawings
FIG. 1 is a system structure diagram of a peak shaving system of a coal-fired power plant based on supercritical carbon dioxide energy storage.
In fig. 1: 1-a boiler; 2-a steam turbine; 3-a condenser; 4-a condensate pump; 5-a first heat exchanger; 6-a water supply pump; 7-a heat regenerator; 8-a first electric shut-off valve; 9-a carbon dioxide compressor; 10-a second electric shut-off valve; 11-a supercritical carbon dioxide high-pressure storage tank; 12-an electric throttle valve; 13-a second heat exchanger; 14-turbine; 15-a cooler; 16-a third electric shut-off valve; 17-a supercritical carbon dioxide low-pressure storage tank; 18-fourth electric shut-off valve; 19-a first generator; 20-a second generator; 21-an electric motor; 22-a first steam extraction pipeline; 23-a second steam extraction pipeline.
Detailed Description
The invention is described in further detail below with reference to the attached drawing figures:
in the description of the present invention, it should be noted that, directions or positional relationships indicated by terms such as "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc., are based on directions or positional relationships shown in the drawings, are merely for convenience of description and simplification of description, and do not indicate or imply that the apparatus or element to be referred to must have a specific direction, be constructed and operated in the specific direction, and thus should not be construed as limiting the present invention; the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance; furthermore, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixed or removable, for example; can be directly connected or indirectly connected through an intermediate medium, and can be communication between two elements. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
The invention is realized by the following scheme: a coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage mainly comprises a steam turbine steam cycle power generation system and a supercritical carbon dioxide energy storage system, wherein peak shaving is completed by the two systems through supercritical carbon dioxide exchange.
As shown in fig. 1, the peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage comprises a boiler 1, a steam turbine 2, a condenser 3, condensate water 4, a first heat exchange 5, a feed pump 6, a regenerator 7, a carbon dioxide compressor 9, a supercritical carbon dioxide high-pressure storage tank 11, a second heat exchanger 13, a turbine 14, a cooler 15, a supercritical carbon dioxide low-pressure storage tank 17, a first generator 19, a second generator 20 and a motor 21. The steam outlet of the boiler 1 is communicated with the steam inlet of the steam turbine 2, the steam outlet of the steam turbine 2 is communicated with the hot side inlet of the condenser 3, steam is cooled in the condenser 3 to be condensed water, the condensed water outlet of the condenser 3 is communicated with the inlet of the condensed water pump 4, the outlet of the condensed water pump 4 is communicated with the cold side inlet of the first heat exchanger 5, the cold side outlet of the first heat exchanger 5 is communicated with the inlet of the water feeding pump 6, the outlet of the water feeding pump 6 is communicated with the water side of the heat regenerator 7, a first steam extraction pipeline 22 is arranged between the hot side inlet of the heat regenerator 7 and a steam turbine cylinder, the water outlet of the heat regenerator 7 is connected with the boiler 1, the outlet of the carbon dioxide compressor 9 is communicated with the hot side inlet of the first heat exchanger 5, the inlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the hot side outlet of the first heat exchanger 5 through a pipeline, the outlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the cold side inlet of the second heat exchanger 13 through a pipeline, a second steam extraction pipeline 23 is arranged between the hot side inlet of the second heat exchanger 13 and a steam turbine cylinder, a first electric valve 8 is arranged on the second steam extraction pipeline 23, the hot side outlet of the second heat exchanger 13 is communicated with the steam side of the first heat exchanger 7, the cold side outlet of the second heat exchanger 13 is communicated with the inlet of the turbine 14, the outlet of the turbine 14 is communicated with the hot side inlet of the cooler 15, and the inlet of the supercritical carbon dioxide low-pressure storage tank 17 is communicated with the hot side outlet of the cooler 15 through a pipeline.
The outlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the cold-side inlet of the second heat exchanger 13 through a pipeline, and an electric throttle valve 12 is arranged on the pipeline; the inlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the hot side outlet of the first heat exchanger 5 through a pipeline, and a second electric stop valve 10 is arranged on the pipeline. The inlet of the supercritical carbon dioxide low-pressure storage tank 17 is communicated with the hot side outlet of the cooler 15 through a pipeline, and a third electric stop valve 16 is arranged on the pipeline; the outlet of the supercritical carbon dioxide low-pressure storage tank 17 is connected with the inlet of the carbon dioxide compressor 9 through a pipeline, and a fourth electric stop valve 18 is arranged on the pipeline.
The working principle of the invention is as follows:
in the steam turbine steam cycle power generation system, superheated steam at the outlet of a boiler 1 enters a steam turbine 2 to expand and do work to drive a first generator 19 to generate power, exhaust steam of the steam turbine 2 enters a condenser 3 to be condensed to become condensate, the condensate flows into a condensate pump 4, the condensate then enters the cold side of a first heat exchanger 5 through the condensate pump 4, heat exchange is carried out between the condensate and high-pressure high-temperature carbon dioxide in a supercritical carbon dioxide energy storage system in the first heat exchanger 5, heated condensate flows out of the first heat exchanger 5, the heated condensate is pressurized by a feed pump 6 and then enters a regenerator 7 to exchange heat with high-pressure high Wen Chouqi from the cylinder of the steam turbine 2, and then the condensate returns to the boiler 1 to complete the steam turbine steam power generation cycle.
The outlet pipeline of the condensate pump 4 is communicated with the cold side inlet of the first heat exchanger 5, and the outlet of the carbon dioxide compressor 9 in the supercritical carbon dioxide energy storage system is communicated with the hot side inlet of the first heat exchanger 5.
The extraction steam from the cylinder of the steam turbine 2 is divided into two streams, one stream enters the heat regenerator 7 to heat the feed water, and the other stream enters the second heat exchanger 13 to heat the high-pressure carbon dioxide in the energy release stage of the supercritical carbon dioxide energy storage system, and then returns to the heat regenerator 7.
In the energy storage stage of the supercritical carbon dioxide energy storage system, carbon dioxide from a supercritical carbon dioxide low-pressure storage tank 17 enters a carbon dioxide compressor 9 to be compressed, the compressed carbon dioxide subsequently enters the hot side of a first heat exchanger 5 to be cooled, and the cooled carbon dioxide passes through a second electric stop valve 10 and is stored in a supercritical carbon dioxide high-pressure storage tank 11; in the energy release stage, the carbon dioxide from the supercritical carbon dioxide high-pressure storage tank 11 enters the cold side of the second heat exchanger 13 after being throttled by the electric throttle valve 12, is heated by the high pressure and Wen Chouqi, then enters the turbine 14 to expand and do work, the turbine 14 drives the second generator 20 to generate electricity, and the supercritical carbon dioxide after energy release enters the supercritical carbon dioxide low-pressure storage tank 17 after being cooled by the cooler 15.
The outlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the cold-side inlet of the second heat exchanger 13 through a pipeline, and an electric throttle valve 12 is arranged on the pipeline; the inlet of the supercritical carbon dioxide high-pressure storage tank 11 is communicated with the hot side outlet of the first heat exchanger 5 through a pipeline, and a second electric stop valve 10 is arranged on the pipeline. The inlet of the supercritical carbon dioxide low-pressure storage tank 17 is communicated with the outlet of the cooler 15 through a pipeline, and a third electric stop valve 16 is arranged on the pipeline; the outlet of the supercritical carbon dioxide low-pressure storage tank 17 is connected with the inlet of the carbon dioxide compressor 9 through a pipeline, and a fourth electric stop valve 18 is arranged on the pipeline.
The operation method of the coal-fired power plant peak shaving system based on supercritical carbon dioxide energy storage provided by the invention comprises the following steps:
normally, the first electric stop valve 8, the second electric stop valve 10, the third electric stop valve 16, the fourth electric stop valve 18 and the electric throttle valve 12 are closed, so that the supercritical carbon dioxide energy storage system is in a closed state, and only the normal operation of the steam turbine steam cycle power generation system is maintained.
When the first power generation amount needs to be reduced, the second electric shutoff valve 10 and the fourth electric shutoff valve 18 are opened, and the remaining valves are kept closed. The turbine steam cycle power generation system normally operates, and redundant electric energy is used for driving a carbon dioxide compressor 9 to work through a motor when the turbine steam cycle power generation system generates load meeting the power grid requirement, the carbon dioxide compressor 9 compresses carbon dioxide in a supercritical carbon dioxide low-pressure storage tank 17 to a preset pressure and stores the compressed carbon dioxide in a supercritical carbon dioxide high-pressure storage tank, and compression heat generated in the compression process heats condensation water output from a condensation water pump (4) through a first heat exchanger 5. After the energy storage is finished, the fourth electric stop valve 18 is closed, and then the second electric stop valve 10 is closed.
When the power generation amount needs to be increased, the first electric shutoff valve 8, the electric throttle valve 12, and the third electric shutoff valve 16 are opened, and the remaining valves are maintained in the closed state. The carbon dioxide from the supercritical carbon dioxide high-pressure storage tank 11 enters the cold side of the second heat exchanger 13 after being throttled by the electric throttle valve 12, exchanges heat with high-pressure high-temperature steam from the cylinder of the steam turbine 2, then enters the turbine 20 to expand and do work so as to drive the second generator 20 to generate electricity and increase the generated energy, and the carbon dioxide from the turbine 14 is cooled to 33-40 ℃ by the cooler 15 and then is stored in the supercritical carbon dioxide low-pressure storage tank 17. After the energy release is finished, the first electric stop valve 8 and the electric throttle valve 12 are closed, and then the third electric stop valve 16 is closed.
The foregoing description of the preferred embodiments of the invention is not intended to be limiting, but rather is intended to cover all modifications, equivalents, alternatives, and improvements that fall within the spirit and scope of the invention.
Claims (7)
1. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage is characterized by comprising a boiler (1) and a carbon dioxide compressor (9), wherein the steam output end of the boiler (1) is connected with the steam input end of a steam turbine (2), the steam exhaust end of the steam turbine (2) is connected to a condenser (3), the condensed water output end of the condenser (3) is connected to the cold side inlet of a first heat exchanger (5), the cold side outlet of the first heat exchanger (5) is connected to the water side inlet of a heat regenerator (7), and the water side outlet of the heat regenerator (7) is connected with the boiler (1);
the outlet of the carbon dioxide compressor (9) is connected with the hot side inlet of the first heat exchanger (5), the hot side outlet of the first heat exchanger (5) is connected to the supercritical carbon dioxide high-pressure storage tank (11), the outlet of the supercritical carbon dioxide high-pressure storage tank (11) is connected with the cold side inlet of the second heat exchanger (13), the cold side outlet of the second heat exchanger (13) is connected to the turbine (14), the outlet of the turbine (14) is connected to the supercritical carbon dioxide low-pressure storage tank (17), and the outlet of the supercritical carbon dioxide low-pressure storage tank (17) is connected with the inlet of the carbon dioxide compressor (9);
the steam extraction output by the steam turbine (2) is divided into a first steam extraction pipeline (22) and a second steam extraction pipeline (23), the first steam extraction pipeline (22) is connected with a hot side inlet of the heat regenerator (7), the second steam extraction pipeline (23) is connected with a hot side inlet of the second heat exchanger (13), and a hot side outlet of the second heat exchanger (13) is communicated with a steam side of the heat regenerator (7);
the power output end of the turbine (2) is connected with a first generator (19), and the power output end of the turbine (14) is connected with a second generator (20);
a power input end of the carbon dioxide compressor (9) is connected with a motor (21); the redundant electric energy is used for driving a carbon dioxide compressor (9) to work through a motor except for the load meeting the power grid requirement generated by the steam turbine steam cycle power generation system;
a condensate pump (4) is arranged on a connecting pipeline of the condenser (3) and the cold side inlet of the first heat exchanger (5);
a water feed pump (6) is arranged between the cold side outlet of the first heat exchanger (5) and the water side inlet of the heat regenerator (7).
2. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage according to claim 1, wherein a cooler (15) is arranged on a connecting pipeline of the turbine (14) and the supercritical carbon dioxide low-pressure storage tank (17).
3. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage according to claim 2, wherein a third electric stop valve (16) is arranged on a connecting pipeline of the cooler (15) and the supercritical carbon dioxide low-pressure storage tank (17); a fourth electric stop valve (18) is arranged on a connecting pipeline of the supercritical carbon dioxide low-pressure storage tank (17) and the carbon dioxide compressor (9).
4. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage according to claim 1, wherein an electric throttle valve (12) is arranged on a cold side inlet connecting pipeline of the supercritical carbon dioxide high-pressure storage tank (11) and the second heat exchanger (13).
5. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage according to claim 1, wherein a second electric stop valve (10) is arranged on a connecting pipeline between a hot side outlet of the first heat exchanger (5) and the supercritical carbon dioxide high-pressure storage tank (11).
6. The peak shaving system of the coal-fired power plant based on supercritical carbon dioxide energy storage according to claim 1, wherein a first electric stop valve (8) is arranged on the second steam extraction pipeline (23).
7. A method for operating a peak shaving system of a coal-fired power plant based on supercritical carbon dioxide energy storage according to any one of claims 1 to 6, characterized in that,
in a normal working state, steam of the boiler (1) is output to the steam turbine (2), the steam turbine (2) drives the first generator (19) to generate power, and exhaust steam after the steam turbine (2) does work is cooled into condensed water through the condenser (3) and flows back to the boiler (1);
when the generating capacity of a generator is reduced, carbon dioxide in a supercritical carbon dioxide low-pressure storage tank (17) is transmitted to a carbon dioxide compressor (9), the generated electricity of a first generator (19) drives the carbon dioxide compressor (9) to do work, the carbon dioxide compressor (9) compresses the carbon dioxide to a preset pressure, the carbon dioxide is output to a supercritical carbon dioxide high-pressure storage tank (11), and compression heat generated in the compression process heats condensed water output from a condensed water pump (4) through a first heat exchanger (5);
when the power generation amount of the generator is increased, carbon dioxide output by the supercritical carbon dioxide high-pressure storage tank (11) flows into the cold side of the second heat exchanger (13) and exchanges heat with high-temperature and high-pressure steam from the steam turbine (2), the heated carbon dioxide is input into the turbine (14) from the second heat exchanger (13), work is performed by the turbine (14), and the carbon dioxide output from the turbine (14) is stored in the supercritical carbon dioxide low-pressure storage tank (17).
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| CN109372600A (en) * | 2018-10-22 | 2019-02-22 | 中国大唐集团科学技术研究院有限公司火力发电技术研究院 | Improved high-efficiency backheat coal base supercritical CO2Double reheat electricity generation system |
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| DE102006035273B4 (en) * | 2006-07-31 | 2010-03-04 | Siegfried Dr. Westmeier | Process for effective and low-emission operation of power plants, as well as for energy storage and energy conversion |
| JP5637808B2 (en) * | 2010-10-21 | 2014-12-10 | 株式会社東芝 | Carbon dioxide recovery method and carbon dioxide recovery steam power generation system |
| CN107035447B (en) * | 2017-04-14 | 2018-12-07 | 南京航空航天大学 | Compress supercritical carbon dioxide accumulation of energy hold over system and its working method |
| CN112065516A (en) * | 2020-09-29 | 2020-12-11 | 西安热工研究院有限公司 | Liquid compressed air energy storage and peak regulation system and method for steam heat gradient utilization |
| CN112901299A (en) * | 2021-03-31 | 2021-06-04 | 西安热工研究院有限公司 | Supercritical CO with electric heat energy storage2Brayton cycle power generation system and method |
| CN113153462A (en) * | 2021-05-26 | 2021-07-23 | 西安热工研究院有限公司 | Waste heat auxiliary heating condensed water system and method for supercritical carbon dioxide circulation cold end |
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