Air energy storage power generation system

Abstract

The utility model provides an air energy storage power generation system, which comprises a compressed air energy storage unit (1) and an air energy storage power generation unit (2), the compressed air energy storage unit (1) comprises two or more sections of compression parts (12-1 and 12-2) and is used for realizing segmented air compression; the steam turbine (11) drags the air compressor (12) to compress the air in sections, and then the obtained high-pressure air is stored in the air storage tank (14); the air energy storage generator set (2) comprises an air expansion heat exchanger (19) used for conducting heat compensation and temperature rise on high-pressure air, a heat compensation heat exchanger (20) used for conducting further heat compensation and temperature rise on the high-pressure air to achieve segmented heat compensation and an expansion machine (21) used for driving a compressed air generator (22) to generate electricity. According to the utility model, the supply and demand balance of the power system can be ensured, the energy loss is relatively small, and the energy utilization efficiency is relatively improved.

Description

Technical Field

[0001] The utility model relates to the field of air energy storage in the power industry, and in particular to an air energy storage power generation system for a thermal power generation system. Background Art

[0002] With the increase in the scale of new energy and the continuous widening of the peak-to-valley difference in electricity consumption, the difficulty of ensuring the supply and demand balance of the power system is becoming increasingly significant. The flexibility of the operation of thermal power units and the need for support from the power grid are becoming more and more prominent. When the demand is too large, the unit load drops, and it faces a series of technical risks such as unstable boiler combustion, flameout, hydrodynamics and unsafe heating surfaces.

[0003] In existing technologies, the flexibility of thermal power units can be improved by improving the boiler's stable combustion capability, implementing wide-load emission modifications, cutting cylinders, adding electrochemical energy storage equipment, etc. This method requires a large amount of capital investment, so the unit cost is relatively high. Utility Model Content

[0004] In order to solve the problems of the existing technology in ensuring the supply and demand balance of the power system, improving the flexibility of the unit operation and not requiring a large amount of capital investment, the utility model provides a compressed air energy storage unit for a coal-fired unit, including: a compressed air energy storage unit 1 and an air energy storage generator unit 2.

[0005] The compressed air energy storage unit 1 comprises:

[0006] The air compressor 12 comprises two or more compression sections 12-1 and 12-2, which are used to compress air in stages. The air compressor 12 is coaxially connected to the steam turbine 11 and is in air communication with an air storage tank 14. The steam turbine 11 drives the air compressor 12 to compress the air in stages, and the resulting high-pressure air is stored in the air storage tank 14. The air storage tank 14 is used to store the compressed air.

[0007] The air energy storage generator set 2 comprises:

[0008] The air expansion heat exchanger 19 is connected to the air storage tank 14 and is used to supplement heat and increase the temperature of the high-pressure air; the heat supplement heat exchanger 20 is connected to the air expansion heat exchanger 19 and is used to further supplement heat and increase the temperature of the high-pressure air to achieve staged heat supplement; the expander 21 is coaxially connected to the compressed air generator 22 and is gas-circuit-connected to the heat supplement heat exchanger 20, and is used to drive the compressed air generator 22 to generate electricity.

[0009] Optionally, in some embodiments, the expander 21 is provided with two or more expansion sections 21-1, 21-2 to achieve segmented expansion. An air passage is provided between each adjacent expansion section 21-1, 21-2, and an air expansion heat exchanger 19-1 or 19-2 and a supplemental heat exchanger 20-1 or 20-2 are sequentially arranged in the air passage along the airflow direction. Each interconnected air expansion heat exchanger 19-1, 19-2, supplemental heat exchanger 20-1, 20-2, and expander 21-1, 21-2 constitutes a supplemental heat expansion unit, which performs segmented heat supplementation and expansion power generation in series.

[0010] Preferably, the compressed air energy storage unit 1 further includes a compressed air heat exchanger 13 , and the air compressor 12 is in air communication with the air storage tank 14 via the compressed air heat exchanger 13 .

[0011] Optionally, in some embodiments, an air path is provided between adjacent compression parts 12-1, 12-2 of the air compressor, and a compressed air heat exchanger 13-1 or 13-2 is also provided in each of the air paths for storing the heat in the compressed air in a heat storage medium in sections to improve energy utilization efficiency.

[0012] Optionally, in some embodiments, the air energy storage generator set 2 further includes: a heat storage medium hot tank 15 which is connected to the compressed air heat exchanger 13 and the air expansion heat exchanger 19; the compressed air energy storage unit 1 stores the heat generated during the air compression process in the heat storage medium hot tank 15 through the compressed air heat exchanger 13; the air expansion heat exchanger 19 uses the heat in the heat storage medium hot tank 15 to raise the temperature of the high-pressure air, and then uses the flue gas or steam of the thermal power unit itself to supplement the heat and raise the temperature.

[0013] Optionally, in some embodiments, the compressed air energy storage unit 1 further includes: a boiler 31, a reheater 32, a main steam turbine high-pressure cylinder 3, a main steam turbine medium and low-pressure cylinders 4, and a thermal power plant generator 5; the boiler 31 generates high-temperature steam, and when the thermal power plant needs to reduce the power generation load of the thermal power plant generator 5, the high-temperature steam enters the steam turbine 11 through the steam valve 10 through the steam path; or, the boiler 31 generates high-temperature steam, and the high-temperature steam enters the reheater 32 through the main steam turbine high-pressure cylinder 3 through the steam path for heating, and then enters the main steam turbine medium and low-pressure cylinders 4, and the main steam turbine medium and low-pressure cylinders 4 are connected to the thermal power plant generator 5.

[0014] Optionally, in some embodiments, the compressed air energy storage unit 1 further includes: a low-pressure heater 6, a deaerator 7, and a high-pressure heater 8, one end of the low-pressure heater 6 is connected to the low-pressure cylinder 4 of the main steam turbine, and the other end is connected to the high-pressure heater 8 via the deaerator 7; after the steam in the low-pressure cylinder 4 of the main steam turbine is condensed, it passes through the low-pressure heater 6, the deaerator 7, and the high-pressure heater 8, and then returns to the boiler 31 to form a cycle.

[0015] Optionally, in some embodiments, the air energy storage generator set 2 further includes a heat storage medium cold tank 16, and the heat storage medium cold tank 16 is connected to the air expansion heat exchanger 19 and the compressed air heat exchanger 13 to form a cycle.

[0016] Optionally, in some embodiments, the air energy storage generator set 2 further includes: a heat storage medium heat pump 17, and the heat storage medium heat pump 17 is located between the heat storage medium heat tank 15 and the air expansion heat exchanger 19 to achieve heat transfer.

[0017] Optionally, in some embodiments, the air energy storage generator set 2 further includes: a heat storage medium cold pump 18, wherein the heat storage medium cold pump 18 is located between the heat storage medium cold tank 16 and the compressed air heat exchanger 13 to achieve heat transfer.

[0018] The above-mentioned technical solution of the present invention has at least the following beneficial technical effects: When a thermal power plant needs to reduce the generating load of a unit, it can extract some steam, use the steam turbine 11 to drive the air compressor 12, compress the air in stages, and store the high-pressure air in the air storage tank 14. At the same time, the heat generated during the air compression process is stored in the heat storage medium tank 15 through the compressed air heat exchanger 13. After the steam is extracted, the generating load of the unit is reduced, and peak load regulation is achieved. When the thermal power plant needs to increase the generating load of the unit, the high-pressure air stored in the air storage tank 14 is heated in stages through the air expansion heat exchanger 19 and the supplementary heat exchanger 20. The expander then drives the compressed air generator 22 to generate electricity, thereby increasing the power generation of the thermal power plant and achieving peak load regulation. The air expansion heat exchanger 19 uses the heat stored during the air compression process to raise the temperature of the high-pressure air, and then uses the thermal power unit's own flue gas or steam for supplementary heat and temperature increase, effectively increasing the power generation of the expansion unit. Therefore, the technical solution of the present invention can improve the flexibility of the unit operation. In addition, the present invention adopts compression. Peak load regulation through air energy storage has the advantages of long service life, relatively low unit cost, environmental protection and energy saving. This utility model uses the steam turbine of the coal-fired power unit to drive compressed air energy storage, while also storing the heat generated during the energy storage process and recycling it in the system, which reduces energy loss and improves energy utilization efficiency. BRIEF DESCRIPTION OF THE DRAWINGS

[0019] In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the conventional technology, the following briefly introduces the drawings required for use in the embodiments. Obviously, the drawings described below are only some embodiments of the present invention. For ordinary technicians in this field, other drawings can be obtained based on these drawings without creative work.

[0020] Figure 1 This is a schematic diagram of a compressed air energy storage unit in a compressed air energy storage unit of a coal-fired unit provided by an embodiment of the present utility model.

[0021] Figure 2 This is a schematic diagram of an air energy storage generator set in a compressed air energy storage unit of a coal-fired unit provided by an embodiment of the present utility model.

[0022] in, Figures 1 to 2 The corresponding relationship between the reference numerals and component names is as follows:

[0023] 1- compressed air energy storage unit, 2- air energy storage generator unit;

[0024] 3- Main steam turbine high-pressure cylinder; 4- Main steam turbine medium- and low-pressure cylinders; 5- Thermal power plant generator; 6- Low-pressure heater; 7- Deaerator; 8- High-pressure heater; 10- Steam valve; 11- Steam turbine; 12- Air compressor; 13- Compressed air heat exchanger; 14- Air storage tank; 15- Thermal storage medium hot tank; 16- Thermal storage medium cold tank; 17- Thermal storage medium heat pump; 18- Thermal storage medium cold pump; 19- Air expansion heat exchanger; 20- Feedback heat exchanger; 21- Expander; 22- Compressed air generator; 31- Boiler; 32- Reheater; DETAILED DESCRIPTION

[0025] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the embodiments described are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0026] Furthermore, in the following description, descriptions of well-known structures and technologies are omitted to avoid unnecessarily confusing the concepts of the present invention.

[0027] The accompanying drawings illustrate schematic diagrams of layer structures according to embodiments of the present invention. These figures are not drawn to scale; for clarity, some details are exaggerated and some details may be omitted. The shapes, relative sizes, and positional relationships of the various regions and layers shown in the figures are merely illustrative and may deviate in practice due to manufacturing tolerances or technical limitations. Those skilled in the art may design regions / layers with different shapes, sizes, and relative positions based on actual needs.

[0028] In addition, the technical features involved in the different embodiments of the present invention described below can be combined with each other as long as they do not conflict with each other.

[0029] With the increase in the scale of new energy and the continuous widening of the peak-to-valley difference in electricity consumption, the difficulty of ensuring the supply and demand balance of the power system is becoming increasingly significant. The flexibility of thermal power unit operation and the demand for grid support are becoming more and more prominent. This requires a large amount of energy storage configuration in thermal power plants to improve the flexibility of unit operation.

[0030] In existing technologies, the flexibility of thermal power units is mainly achieved through improving the boiler's stable combustion capability, implementing wide-load emission modifications, cutting cylinders, and adding electrochemical energy storage equipment.

[0031] Compressed air energy storage has the advantages of long service life, relatively low unit cost, environmental protection and energy saving. Therefore, this embodiment provides a thermal power unit that uses unit extraction and compressed air energy storage to enable the thermal power unit to have deep peak regulation and peak capacity, thereby increasing the operating flexibility of the unit. In order to solve the above problems, an embodiment of the present utility model provides a coal-fired unit compressed air energy storage unit, such as Figure 1-2 As shown, it includes a compressed air energy storage unit 1 and an air energy storage generator unit 2.

[0032] See also Figure 1-2 , Figure 1 A schematic diagram of a compressed air energy storage unit according to a preferred embodiment of the present utility model is shown. Figure 2 An air energy storage generator set according to a preferred embodiment of the present utility model is shown. Figure 1-2 In the diagram, dotted lines represent gas channels, solid lines represent water channels, and arrows indicate flow direction. Circle 1 (1) represents high-temperature flue gas, Circle 2 (2) represents high-temperature steam, Circle 3 (3) represents flue gas after the high-temperature flue gas has partially released its heat, and Circle 4 (4) represents steam after the high-temperature steam has partially released its heat. In the present invention, the gas path can be either flue gas or steam, allowing for flexible adjustment based on actual needs, allowing users to choose between flue gas and steam heating.

[0033] The compressed air energy storage unit 1 comprises:

[0034] The air compressor 12 includes two or more compression sections 12-1, 12-2 for achieving segmented air compression. The number of segments is one or more, and each compression section is preferably formed as a blade turbine. Figure 1 As shown, both ends of the air compressor 12 are connected to the steam turbine 11 and the air storage tank 14. Specifically, each compression section of the air compressor 12 is coaxially connected to the steam turbine 11, and rotates and compresses air under the drive of the steam turbine 11.

[0035] The steam turbine 11 is coaxially connected to the air compressor 12 and rotates at high speed driven by high-temperature steam, thereby dragging the air compressor 12 to compress the air in sections and store the obtained high-pressure air in the air storage tank 14. The air storage tank 14 is used to store compressed air.

[0036] In addition, an air passage is provided between the air compressor 12 and the air storage tank 14, and between each adjacent compression section. Figure 1 The air tank 14 is provided with a plurality of air passages (shown by the dotted line in the middle), so that the compressed air can circulate under pressure and be introduced into the air storage tank 14.

[0037] Preferably, a compressed air heat exchanger 13 is further provided in the air passage to store heat in the compressed air in a heat storage medium to improve energy efficiency. Specifically, compressed air heat exchangers 13-1 and 13-2 are provided between the air compressor 12 and the air storage tank 14, and between each adjacent compression section, respectively, to store heat in the compressed air in the heat storage medium in stages, thereby improving energy efficiency.

[0038] As described above, as one embodiment, the air compressor 12 of the present invention adopts segmented compression, with one or more segments, and an air path channel between every two air compressors. At the same time, the air path channel also has the compressed air heat exchanger 13, which stores the heat in the compressed air in the heat storage medium to improve energy utilization efficiency.

[0039] The air energy storage generator set 2 comprises:

[0040] The air expansion heat exchanger 19 is connected to the air storage tank 14 and is used to supplement heat and increase the temperature of the high-pressure air; the heat supplement heat exchanger 20 is connected to the air expansion heat exchanger 19 and is used to supplement heat in sections of the high-pressure air stored in the air storage tank 14 through the air expansion heat exchanger 19 and the heat supplement heat exchanger 20; the expander 21 is connected between the heat supplement heat exchanger 20 and the compressed air generator 22 and is used to drive the compressed air generator 22 to generate electricity.

[0041] like Figure 2As shown, preferably, an air expansion heat exchanger 19 and a heat supplement heat exchanger 20 are sequentially arranged in the air path between the expander 21 and the air storage tank 14 along the air flow direction. The air expansion heat exchanger 19 in the air path is connected to the heat storage medium hot tank 15 and the heat storage medium cold tank 16, and is used to use the heat in the hot tank 15 to supplement heat and heat the compressed air; further, the heat supplement heat exchanger 20 uses the high-temperature flue gas ring 1 and the high-temperature steam ring 2 to further supplement heat and heat the compressed air, which can greatly improve the efficiency of heat supplement and thermal expansion power generation, and make full use of the compressed air energy and system thermal energy for power generation.

[0042] In a preferred embodiment, the expander 21 comprises two or more expansion sections 21-1 and 21-2 to achieve staged expansion. Specifically, each expansion section is configured as a blade turbine, coaxially connected to each other and to the compressed air generator 22. During operation, each expansion section rotates at high speed driven by high-temperature, high-pressure air, thereby driving the coaxially connected compressed air generator 22 to rotate and generate electricity.

[0043] In the case of segmented expansion, there is a gas path between the adjacent expanders 21 ( Figure 2 In the air passage, air expansion heat exchangers 19-1, 19-2 and heat supplement heat exchangers 20-1, 20-2 are sequentially arranged along the air flow direction. In this way, on the basis of segmented expansion, segmented heat supplement and temperature rise can be further realized, thereby greatly improving the efficiency of heat supplement and thermal expansion power generation, and making full use of compressed air energy and system thermal energy for power generation.

[0044] The working principle of the air energy storage power generation system of the present utility model is systematically introduced below.

[0045] When a thermal power plant needs to reduce the generating load of a unit, it can extract some steam and use the steam turbine 11 to drive the air compressor 12. After the air is compressed in sections, the high-pressure air is stored in the air storage tank 14. At the same time, the heat generated during the air compression process is stored in the heat storage medium hot tank 15 through the compressed air heat exchanger 13. After the steam is extracted, the generating load of the unit is reduced and peak regulation is performed.

[0046] The steam source of the steam turbine 11 can be main steam or extraction steam from a section of the unit.

[0047] When the thermal power plant needs to increase the power generation load of the unit, the high-pressure air stored in the air storage tank 14 is heated in sections through the air expansion heat exchanger 19 and the heat supplement heat exchanger 20, and then the compressed air generator 22 is driven by the expander to generate electricity to increase the power generation of the thermal power plant and achieve peak power generation.

[0048] The air expansion heat exchanger 19 uses the heat stored in the air compression process to raise the temperature of the high-pressure air, and then uses the flue gas or steam of the thermal power unit to supplement the temperature, which can effectively increase the power generation of the expansion unit. Therefore, the technical solution of the present invention can improve the flexibility of the unit operation, and the present invention adopts the method of compressed air energy storage for peak regulation, which has the advantages of long service life, relatively low unit cost, environmental protection and energy saving. The present invention uses the steam turbine of the coal-fired power unit to drive the compressed air energy storage, and at the same time stores the heat in the energy storage process and recycles it in the system. The energy loss is relatively small, and the energy utilization efficiency is relatively improved.

[0049] Combine Figure 2 Optionally, as one embodiment, the air energy storage generator set 2 further includes a heat storage medium tank 15, which is connected to the compressed air heat exchanger 13 and the air expansion heat exchanger 19. In this way, the compressed air energy storage unit 1 stores the heat generated during the air compression process in the heat storage medium tank 15 via the compressed air heat exchanger 13. Furthermore, the air expansion heat exchanger 19 uses the heat in the heat storage medium tank 15 to raise the temperature of the high-pressure air, and then uses the flue gas or steam of the thermal power unit itself to provide additional heat to raise the temperature.

[0050] Optionally, as one embodiment, the compressed air energy storage unit 1 further includes: a boiler 31, a reheater 32, a main steam turbine high-pressure cylinder 3, a main steam turbine intermediate- and low-pressure cylinders 4, and a thermal power plant generator 5; wherein the boiler 31 generates high-temperature steam. When the thermal power plant needs to reduce the power generation load of the thermal power plant generator 5, the high-temperature steam enters the steam turbine 11 through the steam valve 10 via the steam path. Alternatively, the boiler 31 generates high-temperature steam. The high-temperature steam enters the reheater 32 via the steam path through the main steam turbine high-pressure cylinder 3, is heated, and then enters the main steam turbine intermediate- and low-pressure cylinders 4. The main steam turbine intermediate- and low-pressure cylinders 4 are connected to the thermal power plant generator 5.

[0051] Optionally, as one embodiment, the compressed air energy storage unit 1 further includes: a low-pressure heater 6, a deaerator 7, and a high-pressure heater 8. One end of the low-pressure heater 6 is connected to the low-pressure cylinder 4 of the main steam turbine, and the other end is connected to the high-pressure heater 8 via the deaerator 7. After condensing, the steam from the low-pressure cylinder 4 of the main steam turbine passes through the low-pressure heater 6, the deaerator 7, and the high-pressure heater 8, and then returns to the boiler 31, forming a cycle.

[0052] Optionally, as one embodiment, the air energy storage generator set 2 further includes a heat storage medium cold tank 16, and the heat storage medium cold tank 16 is connected to the air expansion heat exchanger 19 and the compressed air heat exchanger 13 to form a cycle.

[0053] Optionally, as one embodiment, the air energy storage generator set 2 further includes a heat storage medium heat pump 17, and the heat storage medium heat pump 17 is located between the heat storage medium hot tank 15 and the air expansion heat exchanger 19 to achieve heat transfer.

[0054] Optionally, as one embodiment, the air energy storage generator set 2 further includes a heat storage medium cold pump 18, and the heat storage medium cold pump 18 is located between the heat storage medium cold tank 16 and the compressed air heat exchanger 13 to achieve heat transfer.

[0055] At night, the electric energy generated by the compressed air energy storage unit 1 is brought into the air energy storage generator set 2 for air compression energy storage; during the day, the air energy storage generator set 2 uses the high-pressure air stored at night to generate electricity, and cooperates with the coal-fired generator set to generate electricity and transmit it to the power grid, realizing the use of compressed air energy storage, so that the thermal power unit has deep peak-shaving and peak-peaking capabilities, and increases the operating flexibility of the unit.

[0056] Obviously, the embodiments described are only some of the embodiments of the present invention, not all of them. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative work are within the scope of protection of the present invention.

[0057] It should be understood that the above-described specific embodiments of the present invention are merely illustrative of or explanation of the principles of the present invention and do not constitute limitations of the present invention. Therefore, any modifications, equivalent substitutions, improvements, etc. made without departing from the spirit and scope of the present invention shall be included within the scope of protection of the present invention. In addition, the appended claims of the present invention are intended to cover all variations and modifications that fall within the scope and metes and bounds of the appended claims, or equivalents thereof.

Claims

1. An air energy storage power generation system, comprising a compressed air energy storage unit (1) and an air energy storage generator unit (2), characterized in that: The compressed air energy storage unit (1) comprises: An air compressor (12) comprising two or more compression sections (12-1, 12-2) for achieving segmented air compression, wherein the air compressor (12) is coaxially connected to the steam turbine (11) and is in gas communication with the air storage tank (14); The steam turbine (11) drives the air compressor (12) to compress the air in sections, and then stores the obtained high-pressure air in the air storage tank (14); An air storage tank (14) for storing compressed air; The air energy storage generator set (2) comprises: An air expansion heat exchanger (19), connected to the air storage tank (14), is used to add heat to the high-pressure air and increase its temperature; A supplementary heat exchanger (20) is connected to the air expansion heat exchanger (19) and is used to further supplement the high-pressure air and increase its temperature; The expander (21) is coaxially connected to the compressed air generator (22) and is connected to the heat exchanger (20) via an air path, and is used to drive the compressed air generator (22) to generate electricity.

2. The system according to claim 1, wherein: The expander (21) is provided with two or more expansion sections (21-1, 21-2) to achieve segmented expansion; An air passage is provided between each adjacent expansion section (21-1, 21-2), and an air expansion heat exchanger (19-1 or 19-2) and a heat supplement heat exchanger (20-1 or 20-2) are sequentially arranged in the air passage along the airflow direction.

3. The system according to claim 1 or 2, characterized in that The compressed air energy storage unit (1) further comprises a compressed air heat exchanger (13), and the air compressor (12) is in air communication with the air storage tank (14) via the compressed air heat exchanger (13).

4. The system according to claim 3, characterized in that An air passage is provided between adjacent compression parts (12-1, 12-2) of the air compressor (12), and a compressed air heat exchanger (13-1 or 13-2) is further provided in each of the air passages for storing heat in the compressed air in a heat storage medium in sections.

5. The system according to claim 3, wherein: The air energy storage generator set (2) further comprises a heat storage medium hot tank (15), which is connected to the compressed air heat exchanger (13) and the air expansion heat exchanger (19); The compressed air energy storage unit (1) stores the heat generated during the air compression process in the heat storage medium tank (15) through the compressed air heat exchanger (13); The air expansion heat exchanger (19) uses the heat in the heat storage medium hot tank (15) to raise the temperature of the high-pressure air, and then uses the flue gas or steam of the thermal power unit itself to supplement the heat and raise the temperature.

6. The system according to claim 1 or 2, characterized in that The compressed air energy storage unit (1) further comprises: a boiler (31), a reheater (32), a main steam turbine high-pressure cylinder (3), a main steam turbine medium- and low-pressure cylinders (4), and a thermal power plant generator (5); The boiler (31) generates high-temperature steam. When the thermal power plant needs to reduce the power generation load of the thermal power plant generator (5), the high-temperature steam enters the steam turbine (11) through the steam path and the steam valve (10); Alternatively, the boiler (31) generates high-temperature steam, which enters the reheater (32) through the steam path through the high-pressure cylinder (3) of the main steam turbine and is heated, and then enters the intermediate and low-pressure cylinders (4) of the main steam turbine, and the intermediate and low-pressure cylinders (4) of the main steam turbine are connected to the generator (5) of the thermal power plant.

7. The system according to claim 6, characterized in that The compressed air energy storage unit (1) further comprises: a low-pressure heater (6), a deaerator (7), and a high-pressure heater (8); one end of the low-pressure heater (6) is connected to the low-pressure cylinder (4) of the main steam turbine, and the other end is connected to the high-pressure heater (8) via the deaerator (7); The steam coming out of the low-pressure cylinder (4) of the main steam turbine is condensed, passes through the low-pressure heater (6), the deaerator (7), and the high-pressure heater (8), and then returns to the boiler (31), forming a cycle.

8. The system according to claim 3, wherein: The air energy storage generator set (2) further includes a heat storage medium cold tank (16), The heat storage medium cold tank (16) is connected to the air expansion heat exchanger (19) and the compressed air heat exchanger (13) to form a cycle.

9. The system according to claim 5, characterized in that The air energy storage generator set (2) further comprises: a heat storage medium heat pump (17); the heat storage medium heat pump (17) is connected between the heat storage medium hot tank (15) and the air expansion heat exchanger (19) to achieve heat transfer.

10. The system according to claim 8, wherein: The air energy storage generator set (2) further comprises: a heat storage medium cold pump (18), wherein the heat storage medium cold pump (18) is connected between the heat storage medium cold tank (16) and the compressed air heat exchanger (13) to achieve heat transfer.

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