A power plant energy regulation system

Abstract

The present invention relates to a power plant energy regulation system, belonging to the technical field of power plant energy regulation. The power plant energy regulation system includes a boiler power generation system, which includes a boiler, a CO2 boiler heater, a generator set, an air cooler, and a flue gas purification system. The CO2 boiler heater is provided in the flue of the boiler, the water vapor outlet of the boiler is connected to the generator set and the air cooler in sequence through a pipeline, and the flue gas outlet of the boiler is connected to the flue gas purification system through a pipeline; a CaCO3 / CaO energy storage system and a Ca(OH)2 / CaO solar thermal utilization system. Beneficial effects: It realizes energy storage, peak regulation, and comprehensive utilization of solar energy for power generation in the power plant power generation system, improves the flexibility of power plant operation, and reduces the component of thermal power generation.

Description

Technical Field

[0001] The present invention belongs to the technical field of power plant energy regulation, and in particular relates to a power plant energy regulation system. Background Art

[0002] With the implementation of the national dual-carbon policy, coal-fired power will be subject to strict controls and face pressure to improve energy conservation and consumption, reduce pollution and carbon emissions, and improve flexibility. Some units will also need to be retrofitted for deep peak shaving, which significantly impacts power plant units, affecting boiler efficiency and increasing power generation costs. Furthermore, my country's renewable energy power plants have seen rapid growth, but these are characterized by high volatility. To achieve relatively stable power output, coordinated energy storage systems are required. Combining thermal power generation with energy storage can improve the operational stability of thermal power plants. Combining this with technologies such as solar thermal power generation and CSP can further reduce power generation costs, making it a technological approach worthy of in-depth research and development. Summary of the Invention

[0003] In order to solve the above-mentioned technical problems, the present invention provides a power plant energy regulation system to realize energy storage, peak regulation, and comprehensive utilization of solar energy for power generation in the power plant's power generation system, thereby improving the flexibility of power plant operation, reducing the component of thermal power generation, and promoting the realization of my country's "carbon neutrality and carbon peak" policy.

[0004] The technical solution of the present invention to solve the above technical problems is as follows: the energy regulation system of the power plant comprises: a boiler power generation system, the boiler power generation system comprises a boiler, a CO2 boiler heater, a generator set, an air cooler and a flue gas purification system, the CO2 boiler heater is provided in the flue of the boiler, the water vapor outlet of the boiler is connected to the generator set and the air cooler in sequence through a pipeline, and the flue gas outlet of the boiler is connected to the flue gas purification system through a pipeline;

[0005] CaCO3 / CaO energy storage system, the CaCO3 / CaO energy storage system includes a CaCO3 decomposition reactor, a calcium oxide silo, a calcium oxide pneumatic conveying device, a CO2 compressor, a first CO2 heat exchanger, a CO2 storage tank, a calcium carbonate synthesis reactor, a calcium carbonate heat exchanger, a CaCO3 silo, a CaCO3 pneumatic conveying device and a Brayton cycle power generation system, the CO2 outlet of the CaCO3 decomposition reactor is connected to one end of the CO2 boiler heater and the input end of the Brayton cycle power generation system through a tee, the other end of the CO2 boiler heater is connected to the CO2 inlet of the CaCO3 decomposition reactor through a pipeline, and the outlet of the CaCO3 decomposition reactor is connected to the CO2 boiler heater through a pipeline. The calcium oxide silo, the calcium oxide pneumatic conveying device and the calcium carbonate synthesis reactor are connected in sequence through a pipeline; the output end of the Brayton cycle power generation system is connected in sequence to the CO2 compressor, the first CO2 heat exchanger, the CO2 storage tank and the calcium carbonate synthesis reactor through a pipeline; the gas outlet of the calcium carbonate synthesis reactor is connected to the hot side inlet of the calcium carbonate heat exchanger through a pipeline; the cold side outlet of the calcium carbonate heat exchanger is connected in sequence to the CaCO3 silo, the CaCO3 pneumatic conveying device and the feed inlet of the CaCO3 decomposition reactor through a pipeline; the hot side outlet of the calcium carbonate heat exchanger is connected to the calcium carbonate synthesis reactor through a pipeline; and the calcium carbonate synthesis reactor is connected to the boiler through a pipeline;

[0006] Ca(OH)2 / CaO solar thermal utilization system, the Ca(OH)2 / CaO solar thermal utilization system includes a Ca(OH)2 synthesis reactor, a Ca(OH)2 silo, a Ca(OH)2 pneumatic conveying device, a Ca(OH)2 solar decomposition system, a water vapor condenser, a condensed water buffer tank and a water heater, the calcium oxide inlet of the Ca(OH)2 synthesis reactor is connected to the calcium oxide silo, the water vapor inlet of the Ca(OH)2 synthesis reactor is connected to the air cooler through a pipeline, and the water vapor outlet of the Ca(OH)2 synthesis reactor is connected to the cold side inlet of the calcium carbonate heat exchanger through a pipeline. The outlet of the Ca(OH)2 synthesis reactor is connected to the Ca(OH)2 silo, the Ca(OH)2 pneumatic conveying device, and the inlet of the Ca(OH)2 solar decomposition system in sequence through a pipeline. The water vapor outlet of the Ca(OH)2 solar decomposition system is connected to the condensate buffer tank and the Ca(OH)2 synthesis reactor in sequence through a pipeline. The water heater is provided on the pipeline between the Ca(OH)2 solar decomposition system and the Ca(OH)2 synthesis reactor, and the water vapor condenser is provided on the pipeline between the condensate buffer tank and the Ca(OH)2 solar decomposition system.

[0007] On the basis of the above technical solution, the present invention can also be improved as follows.

[0008] Preferably, a condensate delivery pump is provided on the pipeline between the Ca(OH)2 solar decomposition system and the water heater.

[0009] Preferably, the Brayton cycle power generation system includes a second CO2 heat exchanger, a Brayton power generation system and a Brayton air cooling system. The hot side inlet of the second CO2 heat exchanger is connected to the CaCO3 decomposition reactor, the hot side outlet is connected to the CO2 compressor, and the cold side outlet is connected to the Brayton power generation system and the inlet of the Brayton air cooling system through a pipeline. The outlet of the Brayton air cooling system is connected to the cold side inlet of the second CO2 heat exchanger.

[0010] Preferably, a CO2 delivery pump is provided on the pipeline between the CO2 storage tank and the calcium carbonate synthesis reactor.

[0011] Preferably, the calcium oxide outlet of the Ca(OH)2 solar decomposition system is connected to the CaO silo and the inlet of the CaO pneumatic conveying device in sequence through a pipeline, and the outlet of the CaO pneumatic conveying device is connected to the Ca(OH)2 synthesis reactor.

[0012] Preferably, the first CO2 heat exchanger is any one of an indirect air heat exchanger, a heat pump or a cooler.

[0013] The beneficial effects are:

[0014] 1. It improves the utilization effect of solar energy, a new energy source, by storing solar energy in calcium-based chemicals through the Ca(OH)2 / CaO calcium-based circulation system. The energy storage process has low heat loss and flexible adjustment.

[0015] 2. The heat in the boiler flue gas is stored in calcium-based chemicals through the CaCO3 / CaO calcium-based circulation system. The heat loss in this energy storage process is relatively small and the adjustment is flexible;

[0016] 3. The combination of boiler system, solar energy system and calcium-based circulation system improves the efficiency of the power plant system, makes the power load adjustment more flexible, and reduces the heat loss of the energy storage system;

[0017] 4. The heat exchange in the CaCO3 / CaO calcium-based circulation system uses the decomposition products in the CaCO3 / CaO calcium-based circulation system to directly use for heat exchange, with high heat exchange efficiency;

[0018] 5. The CaCO3 or Ca(OH)2 used in the calcium-based cycle is cheap and readily available. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] Figure 1 It is a structural schematic diagram of the present invention.

[0020] In the accompanying drawings, the components represented by the reference numerals are as follows:

[0021] 1. CaCO3 decomposition reactor; 2. Calcium oxide silo; 3. Calcium oxide pneumatic conveying device; 4. CO2 compressor; 5. First CO2 heat exchanger; 6. CO2 storage tank; 7. CO2 transfer pump; 8. Second CO2 heat exchanger; 9. Brayton power generation system; 10. Brayton air cooling system; 11. Calcium carbonate heat exchanger; 12. Calcium carbonate synthesis reactor; 13. CaCO3 silo; 14. CaCO3 pneumatic conveying device; 15. CO2 boiler heater; 16. Generator set; 17. Air cooler; 18. Ca(OH)2 silo; 19. Ca(OH)2 pneumatic conveying device; 20. CaO pneumatic conveying device; 21. CaO silo; 22. Ca(OH)2 solar decomposition system; 23. Water vapor condenser; 24. Condensate buffer tank; 25. Condensate transfer pump; 26. Water heater; 27. Ca(OH)2 synthesis reactor. DETAILED DESCRIPTION

[0022] The principles and features of the present invention are described below with reference to the accompanying drawings. The examples given are only used to explain the present invention and are not used to limit the scope of the present invention.

[0023] Example

[0024] like Figure 1 As shown, this embodiment provides a power plant energy regulation system, including: a boiler power generation system A, the boiler power generation system A including a boiler, a CO2 boiler heater 15, a generator set 16, an air cooler 17 and a flue gas purification system, the CO2 boiler heater 15 is provided in the flue of the boiler, the water vapor outlet of the boiler is connected to the generator set 16 and the air cooler 17 in sequence through a pipeline, and the flue gas outlet of the boiler is connected to the flue gas purification system through a pipeline;

[0025] CaCO3 / CaO energy storage system B, the CaCO3 / CaO energy storage system B includes a CaCO3 decomposition reactor 1, a calcium oxide silo 2, a calcium oxide pneumatic conveying device 3, a CO2 compressor 4, a first CO2 heat exchanger 5, a CO2 storage tank 6, a calcium carbonate synthesis reactor 12, a calcium carbonate heat exchanger 11, a CaCO3 silo (13), a CaCO3 pneumatic conveying device (14) and a Brayton cycle power generation system D, the CO2 outlet of the CaCO3 decomposition reactor 1 is connected to one end of the CO2 boiler heater 15 and the input end of the Brayton cycle power generation system D respectively through a tee, the other end of the CO2 boiler heater 15 is connected to the CO2 inlet of the CaCO3 decomposition reactor 1 through a pipeline, and the outlet of the CaCO3 decomposition reactor 1 is connected to the calcium oxide silo 2, the calcium oxide pneumatic conveying device 3 and the input end of the Brayton cycle power generation system D respectively through a tee, and the other end of the CO2 boiler heater 15 is connected to the CO2 inlet of the CaCO3 decomposition reactor 1 through a pipeline. The conveying device 3 and the calcium carbonate synthesis reactor 12, the output end of the Brayton cycle power generation system D is connected to the CO2 compressor 4, the first CO2 heat exchanger 5, the CO2 storage tank 6 and the calcium carbonate synthesis reactor 12 in sequence through a pipeline, a CO2 delivery pump 7 is provided on the pipeline between the CO2 storage tank 6 and the calcium carbonate synthesis reactor 12, the gas outlet of the calcium carbonate synthesis reactor 12 is connected to the hot side inlet of the calcium carbonate heat exchanger 11 through a pipeline, the cold side outlet of the calcium carbonate heat exchanger 11 is connected to the CaCO3 silo (13), the CaCO3 pneumatic conveying device (14) and the feed inlet of the CaCO3 decomposition reactor 1 in sequence through a pipeline, the hot side outlet of the calcium carbonate heat exchanger 11 is connected to the calcium carbonate synthesis reactor 12 through a pipeline, and the calcium carbonate synthesis reactor 12 is connected to the boiler through a pipeline;

[0026] Ca(OH)2 / CaO solar thermal utilization system C, the Ca(OH)2 / CaO solar thermal utilization system C includes a Ca(OH)2 synthesis reactor 27, a Ca(OH)2 silo 18, a Ca(OH)2 pneumatic conveying device 19, a Ca(OH)2 solar decomposition system 22, a water vapor condenser 23, a condensed water buffer tank 24 and a water heater 26, the calcium oxide inlet of the Ca(OH)2 synthesis reactor 27 is connected to the calcium oxide silo 2, the water vapor inlet of the Ca(OH)2 synthesis reactor 27 is connected to the air cooler 17 through a pipeline, the water vapor outlet of the Ca(OH)2 synthesis reactor 27 is connected to the cold side inlet of the calcium carbonate heat exchanger 11 through a pipeline, and the outlet of the Ca(OH)2 synthesis reactor 27 is connected to the Ca(OH)2 silo 18, the Ca(OH)2 pneumatic conveying device 19, the Ca(OH)2 solar decomposition system 22, the water vapor condenser 23, the condensed water buffer tank 24 and the water heater 26. )2 solar decomposition system 22, the water vapor outlet of the Ca(OH)2 solar decomposition system 22 is connected to the condensate buffer tank 24 and the Ca(OH)2 synthesis reactor 27 in sequence through a pipeline, the water heater 26 is provided on the pipeline between the Ca(OH)2 solar decomposition system 22 and the Ca(OH)2 synthesis reactor 27, the water vapor condenser 23 is provided on the pipeline between the Ca(OH)2 solar decomposition system 22, a condensate delivery pump 25 is provided on the pipeline between the Ca(OH)2 solar decomposition system 22 and the water heater 26, the calcium oxide outlet of the Ca(OH)2 solar decomposition system 22 is connected to the CaO silo 21 and the inlet of the CaO pneumatic conveying device 20 in sequence through a pipeline, and the outlet of the CaO pneumatic conveying device 20 is connected to the Ca(OH)2 synthesis reactor 27.

[0027] The first CO2 heat exchanger 5 is any one of an indirect air heat exchanger, a heat pump or a cooler.

[0028] Preferably, the Brayton cycle power generation system D includes a second CO2 heat exchanger 8, a Brayton power generation system 9 and a Brayton air cooling system 10. The hot side inlet of the second CO2 heat exchanger 8 is connected to the CaCO3 decomposition reactor 1, the hot side outlet is connected to the CO2 compressor 4, and the cold side outlet is connected to the Brayton power generation system 9 and the inlet of the Brayton air cooling system 10 through a pipeline. The outlet of the Brayton air cooling system 10 is connected to the cold side inlet of the second CO2 heat exchanger 8.

[0029] The power plant's boiler flue gas uses a CO2 boiler heater 15 to heat the CO2 from the CaCO3 decomposition reactor 1. The heated CO2 then returns to the CaCO3 decomposition reactor 1 for the CaCO3 decomposition reaction. Calcium carbonate is transported from the CaCO3 silo 13 by a CaCO3 pneumatic conveying device 14. The CaCO3 decomposes into CaO and CO2, with the CaO entering the calcium oxide silo 2. The decomposed CO2 is partially sent to the CO2 boiler heater 15, and partially sent to the Brayton power generation system 9 for power generation. After being compressed by the CO2 compressor 4 and the first CO2 heat exchanger 5, it is stored in the CO2 storage tank 6, completing the boiler flue gas heat and energy storage process. During the energy consumption process of the CaCO3 / CaO energy storage system, the CaO silo 2 from the calcium oxide material is transported via the calcium oxide pneumatic conveying device to the calcium carbonate synthesis reactor 12, where it reacts with the CO2 from the CO2 storage tank 6 delivered by the CO2 delivery pump 7. The reaction releases heat, which is removed by the circulating medium. The remaining CaCO3 heat is exchanged by the calcium carbonate heat exchanger before entering the CaCO3 silo, completing the system's energy consumption process. CaCO 3 / The CaO in the CaO energy storage system can be used as a supplementary medium in the Ca(OH)2 / CaO solar thermal utilization system, and the calcium medium supplement in the CaCO3 / CaO energy storage system can supplement CaCO3 to the CaCO3 decomposition reactor 1.

[0030] The core device of the Ca(OH)2 / CaO solar thermal utilization system C is the Ca(OH)2 solar decomposition system. The Ca(OH)2 from the Ca(OH)2 silo 18 transported by the Ca(OH)2 pneumatic conveying device 19 is decomposed in the Ca(OH)2 solar decomposition system 22 and separated into CaO and H2O gas. The generated CaO falls into the CaO silo 21, and the generated water vapor is condensed by the water vapor condenser 23 and enters the condensate buffer tank 24, completing the decomposition and energy storage process of CaOH2. When energy is used, the calcium oxide from the CaO silo transported by the CaO pneumatic conveying device reacts with the Ca(OH)2 synthesis reactor 27 and the water vapor from the condensate buffer tank 24 heated by the water heater 26 and then passed through the condensate delivery pump 25. The reaction releases a large amount of heat, which is used to heat the thermal cycle medium of the power plant. The Ca(OH)2 generated by the reaction is used to heat the thermal cycle medium of the power plant. )2 Enter the Ca(OH)2 silo 18 for storage and buffering.

[0031] The entire power plant system recycles and utilizes the original water system through transformation and utilization, and utilizes the CO2 boiler heater 1515, generator set 16, air cooler 17, etc. in the original boiler system of the power plant, the medium heating system of the CaCO3 / CaO energy storage system B, Ca(OH)2 / CaO solar thermal utilization system C, etc., and is used in combination with the water-gas cycle of the original boiler system. The power plant's original steam-water system, Ca(OH)2 synthesis reactor 27, calcium carbonate synthesis reactor 12, calcium carbonate heat exchanger 11, etc. form a water-gas circulation power generation and utilization system, making full use of green energy such as solar energy. During low-load peak regulation, the output of the CaCO3 / CaO energy storage system B, Ca(OH)2 / CaO solar thermal utilization system C and the output of the power plant are used to adjust the output load of the entire power plant.

[0032] A power plant energy regulation system equipment and quantity:

[0033] A boiler power generation system A mainly includes an original boiler, SCR, air preheater, dust collector, desulfurization tower, water-saving tower, generator set 16, air cooler 17, etc.

[0034] A CaCO3 / CaO energy storage system B includes a CaCO3 decomposition reactor 1, a calcium oxide silo 2, a calcium oxide pneumatic conveying device 3, a CO2 compressor 4, a CO2 heat exchanger 5, a CO2 storage tank 6, a CO2 delivery pump 7, a calcium carbonate synthesis reactor 12, a calcium carbonate heat exchanger 11, a CaCO3 silo 13, a CaCO3 pneumatic conveying device 14, a CO2 boiler heater 15, and a Brayton cycle power generation system D.

[0035] A Ca(OH)2 / CaO solar thermal utilization system C mainly includes a Ca(OH)2 decomposition reactor 27, a Ca(OH)2 silo 18, a Ca(OH)2 pneumatic conveying device 19, a Ca(OH)2 solar decomposition system 22, a water vapor condenser 23, a condensate buffer tank 24, a condensate transfer pump 25 for operation and a standby condensate transfer pump 25, a water heater 26, a Ca(OH)2 synthesis reactor 27, a CaO silo 21, and a CaO pneumatic conveying device 20.

[0036] A Brayton cycle power generation system D mainly includes a CO2 heat exchanger 8, a Brayton power generation system 9 and a Brayton air cooling system 10.

[0037] In the description of the present invention, it should be understood that the terms "center", "length", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "inside", "outside", "peripheral", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, and do not indicate or imply that the referred system or element must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as a limitation on the present invention.

[0038] In the description of the present invention, “a plurality of” means at least two, for example, two, three, etc., unless otherwise clearly and specifically defined.

[0039] In the present invention, unless otherwise specified or limited, the terms "installed," "connected," "connect," "fixed," etc. should be understood in a broad sense. For example, they can refer to fixed connection, detachable connection, or integration; mechanical connection, electrical connection; direct connection, or indirect connection through an intermediate medium; internal communication between two components, or interaction between two components, unless otherwise specified. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on specific circumstances.

[0040] In the description of this specification, the reference terms "one embodiment", "some embodiments", "example", "specific example", or "some examples" mean that the specific features, structures, materials or characteristics described in conjunction with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner. In addition, those skilled in the art can combine and combine different embodiments or examples described in this specification and features of different embodiments or examples without contradiction.

[0041] The above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Any modifications, equivalent substitutions, improvements, etc. made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A power plant energy regulation system, characterized in that: include: A boiler power generation system (A), comprising a boiler, a CO2 boiler heater (15), a generator set (16), an air cooler (17), and a flue gas purification system, wherein the CO2 boiler heater (15) is provided in a flue of the boiler, a water vapor outlet of the boiler is connected to the generator set (16) and the air cooler (17) in sequence through a pipeline, and a flue gas outlet of the boiler is connected to the flue gas purification system through a pipeline; A CaCO3 / CaO energy storage system (B) comprising a CaCO3 decomposition reactor (1), a calcium oxide silo (2), a calcium oxide pneumatic conveying device (3), a CO2 compressor (4), a first CO2 heat exchanger (5), a CO2 storage tank (6), a calcium carbonate synthesis reactor (12), a calcium carbonate heat exchanger (11), a CaCO3 silo (13), a CaCO3 pneumatic conveying device (14) and a Brayton cycle power generation system (D), wherein the CO2 outlet of the CaCO3 decomposition reactor (1) is connected to one end of the CO2 boiler heater (15) and the input end of the Brayton cycle power generation system (D) through a tee, the other end of the CO2 boiler heater (15) is connected to the CO2 inlet of the CaCO3 decomposition reactor (1) through a pipeline, and the outlet of the CaCO3 decomposition reactor (1) is connected to the CO2 inlet of the CaCO3 decomposition reactor (1) through a pipeline. The calcium oxide silo (2), the calcium oxide pneumatic conveying device (3) and the calcium carbonate synthesis reactor (12) are sequentially connected; the output end of the Brayton cycle power generation system (D) is sequentially connected to the CO2 compressor (4), the first CO2 heat exchanger (5), the CO2 storage tank (6) and the calcium carbonate synthesis reactor (12) through a pipeline; the gas outlet of the calcium carbonate synthesis reactor (12) is connected to the hot side inlet of the calcium carbonate heat exchanger (11) through a pipeline; the cold side outlet of the calcium carbonate heat exchanger (11) is sequentially connected to the CaCO3 silo (13), the CaCO3 pneumatic conveying device (14) and the feed port of the CaCO3 decomposition reactor (1) through a pipeline; the hot side outlet of the calcium carbonate heat exchanger (11) is connected to the calcium carbonate synthesis reactor (12) through a pipeline; and the calcium carbonate synthesis reactor (12) is connected to the boiler through a pipeline; A Ca(OH)2 / CaO solar thermal utilization system (C), comprising a Ca(OH)2 synthesis reactor (27), a Ca(OH)2 silo (18), a Ca(OH)2 pneumatic conveying device (19), a Ca(OH)2 solar decomposition system (22), a water vapor condenser (23), a condensed water buffer tank (24) and a water heater (26); the calcium oxide inlet of the Ca(OH)2 synthesis reactor (27) is connected to the calcium oxide silo (2); the water vapor inlet of the Ca(OH)2 synthesis reactor (27) is connected to the air cooler (17) through a pipeline; and the water vapor outlet of the Ca(OH)2 synthesis reactor (27) is connected to the cold side of the calcium carbonate heat exchanger (11) through a pipeline. The inlet of the Ca(OH)2 synthesis reactor (27) is connected to the Ca(OH)2 silo (18), the Ca(OH)2 pneumatic conveying device (19), and the inlet of the Ca(OH)2 solar decomposition system (22) in sequence through a pipeline. The water vapor outlet of the Ca(OH)2 solar decomposition system (22) is connected to the condensate buffer tank (24) and the Ca(OH)2 synthesis reactor (27) in sequence through a pipeline. The water heater (26) is provided on the pipeline between the Ca(OH)2 solar decomposition system (22) and the Ca(OH)2 synthesis reactor (27). The water vapor condenser (23) is provided on the pipeline between the condensate buffer tank (24) and the Ca(OH)2 solar decomposition system (22).

2. The power plant energy regulation system according to claim 1, characterized in that: A condensate delivery pump (25) is provided on the pipeline between the Ca(OH)2 solar decomposition system (22) and the water heater (26).

3. The power plant energy regulation system according to claim 1, characterized in that: The Brayton cycle power generation system (D) comprises a second CO2 heat exchanger (8), a Brayton power generation system (9) and a Brayton air cooling system (10); the hot side inlet of the second CO2 heat exchanger (8) is connected to the CaCO3 decomposition reactor (1), the hot side outlet is connected to the CO2 compressor (4), the cold side outlet is connected to the Brayton power generation system (9) and the inlet of the Brayton air cooling system (10) through a pipeline, and the outlet of the Brayton air cooling system (10) is connected to the cold side inlet of the second CO2 heat exchanger (8).

4. The power plant energy regulation system according to claim 1, characterized in that: A CO2 delivery pump (7) is provided on the pipeline between the CO2 storage tank (6) and the calcium carbonate synthesis reactor (12).

5. The power plant energy regulation system according to claim 1, characterized in that: The calcium oxide outlet of the Ca(OH)2 solar decomposition system (22) is connected to the CaO silo (21) and the inlet of the CaO pneumatic conveying device (20) in sequence through a pipeline, and the outlet of the CaO pneumatic conveying device (20) is connected to the Ca(OH)2 synthesis reactor (27).

6. The power plant energy regulation system according to any one of claims 1 to 5, characterized in that: The first CO2 heat exchanger (5) is any one of an indirect air heat exchanger, a heat pump or a cooler.

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