A thermal power unit coupled compressed air energy storage system

Abstract

This utility model discloses a compressed air energy storage system coupled to a thermal power unit in the field of energy storage technology. It includes a compressor unit for compressing air, a refrigeration unit for cooling air, and a thermal power unit providing a heat source for the refrigeration unit. A temperature sensor for detecting air temperature is installed at the compressor unit inlet. The temperature sensor signal is connected to the refrigeration unit and the thermal power unit. The thermal power unit is connected to the refrigeration unit to provide the heat source required for cooling its air. The refrigeration unit is connected to the compressor inlet to deliver cooled air. When the temperature sensor detects that the ambient temperature is too high, this utility model uses a refrigeration unit to cool the air temperature at the compressor inlet, thereby reducing the energy consumption of the compressed air energy storage system.

Description

Technical Field

[0001] This utility model relates to the field of energy storage technology, and in particular to a thermal power unit coupled compressed air energy storage system. Background Technology

[0002] In the process of building a power system based on new energy sources, energy storage is receiving increasing attention due to its ability to mitigate grid fluctuations. Compressed air energy storage systems, as a large-capacity, long-duration energy storage solution, are undergoing rapid development. However, the performance of compressed air energy storage systems is highly dependent on environmental conditions, especially the compressor inlet air temperature, which has a decisive impact on system operation. When the ambient temperature rises, the specific volume of air increases while its density decreases, resulting in a significant decrease in the mass flow rate of air entering the compressor at the same volumetric flow rate.

[0003] To maintain the rated energy storage capacity of the system design, the compressor operating time must be extended or its speed increased to compensate for insufficient mass flow rate. This not only directly increases the charging time of the system, but also significantly increases energy consumption due to the compressor operating outside the design conditions for a long time.

[0004] Meanwhile, high-temperature intake air exacerbates the temperature rise during compression, leading to a sharp increase in the load on the interstage cooling system in advanced adiabatic compressed air energy storage systems. Furthermore, sustained high-temperature operation can cause compressor bearing overheating and accelerated aging of seals. From an economic perspective, the efficiency losses and increased maintenance costs caused by high temperatures significantly increase the levelized cost of electricity (LCOE) of the energy storage system. These adverse factors severely restrict the widespread application of compressed air energy storage in high-temperature regions. Utility Model Content

[0005] The purpose of this invention is to provide a compressed air energy storage system coupled to a thermal power unit, which uses a refrigeration unit to cool the inlet air temperature of the compressor when the temperature sensor detects that the ambient temperature is too high, thereby reducing the energy consumption of the compressed air energy storage system.

[0006] To achieve the above objectives, the technical solution adopted by this utility model is as follows:

[0007] This utility model provides a thermal power unit coupled with compressed air energy storage system, including a compressor unit for compressed air, a refrigeration unit for cooling air, and a thermal power unit providing a heat source for the refrigeration unit. The compressor unit inlet is equipped with a temperature sensor for detecting air temperature. The temperature sensor signal is connected to the refrigeration unit and the thermal power unit. The thermal power unit is connected to the refrigeration unit to provide the heat source required for cooling its air. The refrigeration unit is connected to the compressor inlet to deliver cooled air.

[0008] The aforementioned thermal power unit coupled compressed air energy storage system includes a refrigeration unit comprising a generator, a condenser, an evaporator, and an absorber connected in sequence by circulating pipelines. The evaporator is connected to the inlet of the compressor unit, draws in air from the inlet, cools it, and then returns it to the inlet. The generator is connected to and receives a heat source provided by the thermal power unit to heat the absorbent liquid, and delivers the steam generated by heating to the condenser. The condenser condenses the steam into liquid refrigerant and delivers it to the evaporator. The evaporator vaporizes the liquid refrigerant, absorbs heat to cool the drawn air, and delivers the vaporized refrigerant vapor to the absorber. The absorber absorbs the refrigerant vapor into the absorbent liquid to generate concentrated absorbent liquid, which is then delivered to the generator.

[0009] The aforementioned thermal power unit coupled with compressed air energy storage system includes a boiler, a turbine unit, a condenser, and a heater unit connected in sequence by circulating pipelines. The turbine unit is also connected to the heater unit by pipelines and to a generator via an extraction steam control valve. The boiler's output pipeline is connected to the turbine unit to deliver high-pressure steam generated by heating feedwater from coal combustion. The high-pressure steam in the turbine unit expands, performs work, and reduces pressure and temperature to generate the input steam required by the generator, the exhaust steam used for heating the heater unit, and the exhaust steam input to the condenser. The condenser condenses the input exhaust steam into condensate through cooling water and delivers it to the heater unit. The heater unit heats the condensate and returns it to the boiler as feedwater.

[0010] The aforementioned thermal power unit coupled compressed air energy storage system includes a turbine unit comprising a high-pressure cylinder, an intermediate-pressure cylinder, a first low-pressure cylinder, and a second low-pressure cylinder connected coaxially in sequence. A first output pipeline of the boiler connects to the high-pressure cylinder to output high-pressure steam. The high-pressure steam in the high-pressure cylinder expands and performs work, then, after decreasing to reheat pressure, is returned to the boiler's reheater. A second output pipeline of the boiler connects to the intermediate-pressure cylinder to output reheated steam from the reheater. The reheated steam in the intermediate-pressure cylinder expands and performs work, then is respectively delivered to an extraction control valve and the first low-pressure cylinder connected by pipelines. The steam in the first and second low-pressure cylinders expands and performs work sequentially, then is discharged to a condenser connected by pipelines.

[0011] The aforementioned thermal power unit coupled compressed air energy storage system further includes a deaerator. The heater group includes a high-pressure heater group and a low-pressure heater group. The high-pressure heater group includes a first heater, a second heater, and a third heater connected in sequence by pipelines. The low-pressure heater group includes a fourth heater, a fifth heater, a sixth heater, and a seventh heater connected in sequence by pipelines. The high-pressure cylinder also has two output lines, connected to the first and second heaters respectively by pipelines and gradually reducing the pressure to exhaust steam. The intermediate-pressure cylinder also has one output line directly connected to the deaerator, and the other line... The extraction steam control valve pipeline is connected to the third heater; the outputs of the first and second low-pressure cylinders are also combined into four lines, which are respectively connected to the fourth to seventh heaters for progressively reduced pressure exhaust; the condensate output from the condenser pipeline is preheated by the seventh to fourth heaters in sequence before being fed into the deaerator; the condensate formed by the preheating of the condensate by each low-pressure heater is returned to the condenser through a series of pipelines; the deoxygenated water output from the deaerator pipeline is heated by the third to first heaters in sequence before being fed into the boiler as boiler feedwater; the condensate formed by the heating of the deoxygenated water by each high-pressure heater is returned to the deaerator through a series of pipelines.

[0012] The aforementioned thermal power unit is coupled with a compressed air energy storage system. The generator is also connected to the condenser via pipeline. The intermediate pressure cylinder delivers steam to the generator for heat exchange through the extraction steam control valve. The exhaust steam after heat exchange is returned to the condenser via pipeline. The evaporator also delivers cooling water to the condenser via pipeline.

[0013] The aforementioned thermal power unit coupled with a compressed air energy storage system further includes a generator connected to the end output of the steam turbine unit, which converts the mechanical energy of the steam turbine into electrical energy.

[0014] The aforementioned thermal power unit coupled compressed air energy storage system also includes three interstage heat exchangers. The compressor unit includes a first compressor, a second compressor, a third compressor, and a fourth compressor connected in series. Interstage heat exchangers are provided between adjacent compressors, and the hot-side output ends of each interstage heat exchanger are connected in parallel.

[0015] In the aforementioned thermal power unit coupled compressed air energy storage system, the compressor unit inlet delivers air to the refrigeration unit through the intake pipeline, and the refrigeration unit returns cooled air to the compressor unit inlet through the return pipeline. The intake pipeline and the return pipeline are respectively equipped with air flow control valves, and the air flow control valves are signal-connected to temperature sensors.

[0016] The aforementioned thermal power unit coupled compressed air energy storage system also includes a gas storage system, a heat storage system, and a turbine expander unit; the output of the fourth compressor is connected to the gas storage system, which stores high-pressure air and is connected to the inlet of the turbine expander unit; the turbine expander unit includes three turbine expanders connected in sequence; an interstage heat exchanger is provided between adjacent turbine expanders; the hot-side output of each interstage heat exchanger is connected in parallel to the heat storage system; the gas storage system releases high-pressure air, which flows through the turbine expanders in sequence to expand and do work, and absorbs heat from the heat storage system in the interstage heat exchanger to drive the generator.

[0017] Beneficial effects:

[0018] Compared with the prior art, the present invention has the following advantages and advancements:

[0019] The thermal power unit coupled compressed air energy storage system of this utility model detects the ambient temperature at the compressor inlet by setting a temperature sensor at the compressor inlet. When the ambient temperature is too high, a chiller is used to cool the air temperature at the compressor inlet, thereby reducing the energy consumption of the compressed air energy storage system and improving the compression efficiency of the compressed air energy storage system.

[0020] This utility model's thermal power unit coupled compressed air energy storage system achieves coordinated operation and cascaded energy utilization of the thermal power unit's power generation and heating by driving a chiller through the thermal power unit. Steam extracted from the thermal power unit's turbine serves as a heat source to drive an absorption chiller, generating cooling capacity. This cooling capacity is then used to cool the high-temperature compressor inlet air, thereby shortening the compressor compression time and reducing the total power consumption during compression. Furthermore, this embodiment of the thermal power unit coupled compressed air energy storage system does not use a compressed air energy storage system to drive the chiller; instead, it uses a separate power source (steam extracted from the turbine) to drive the chiller, thus not affecting the original compression power of the compressed air energy storage system. Attached Figure Description

[0021] Figure 1 This is a schematic diagram of a thermal power unit coupled with compressed air energy storage system according to Embodiment 1 of this utility model;

[0022] Explanation of reference numerals in the attached figures:

[0023] 1.1-First compressor; 1.2-Second compressor; 1.3-Third compressor; 1.4-Fourth compressor; 2-Interstage heat exchanger; 3-Turbine expander; 4-Gas storage system; 5-Heat storage system; 6.1-High-pressure cylinder; 6.2-Intermediate-pressure cylinder; 6.3-First low-pressure cylinder; 6.4-Second low-pressure cylinder; 7-Boiler; 8-Condenser; 9-Generator; 10.1-First heater; 10.2-Second heater; 10.3-Third heater; 10.4-Fourth heater; 10.5-Fifth heater; 10.6-Sixth heater; 10.7-Seventh heater; 11-Extraction control valve; 12-Deaerator; 13-Generator; 14-Condenser; 15-Evaporator; 16-Absorber; 17-Air flow control valve. Detailed Implementation

[0024] The technical solutions of this utility model will now be clearly and completely described with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this utility model, and not all embodiments. The following description of at least one exemplary embodiment is merely illustrative and is in no way intended to limit this utility model or its application or use.

[0025] In the description of this utility model, it should be understood that the terms "center," "longitudinal," "lateral," "upper," "lower," "front," "rear," "left," "right," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings. They are only used to explain the relative positional relationship and movement between components in a specific posture. If the specific posture changes, the directional indication will also change accordingly. These terms are used only for the convenience of describing this utility model and for simplifying the description, and are not intended to indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation. Therefore, they should not be construed as limitations on this utility model. In the description of this utility model, unless otherwise stated, "a plurality of" means two or more.

[0026] Furthermore, in the description of this utility model, it should be noted that, unless otherwise explicitly specified and limited, the terms "installation," "connection," and "joining" should be interpreted broadly. For example, they can refer to a fixed connection, a detachable connection, or an integral connection; they can refer to a mechanical connection or an electrical connection; they can refer to a direct connection or an indirect connection through an intermediate medium; and they can refer to the internal connection of two components. Those skilled in the art can understand the specific meaning of the above terms in this utility model based on the specific circumstances.

[0027] Example 1

[0028] This embodiment describes a thermal power unit coupled with compressed air energy storage system, such as... Figure 1 As shown, it includes a compressor unit for compressing air, a refrigeration unit for cooling air, and a thermal power unit that provides a heat source for the refrigeration unit; the compressor unit is equipped with a temperature sensor at its inlet to detect the air temperature, and the temperature sensor signal is connected to the refrigeration unit and the thermal power unit. The thermal power unit is connected to the refrigeration unit to provide the heat source required for cooling its air, and the refrigeration unit is connected to the compressor inlet to deliver cooled air.

[0029] In this embodiment, when the temperature sensor detects that the air temperature at the compressor inlet is greater than the design value, a chiller is used to deliver cooled air to reduce the original air temperature at the compressor inlet.

[0030] The following describes the specific implementation of a thermal power unit coupled with a compressed air energy storage system:

[0031] like Figure 1 As shown in the lower right corner, the refrigeration unit includes a generator 13, a condenser 14, an evaporator 15, and an absorber 16 connected in sequence by circulating pipelines. The evaporator 15 is connected to the inlet of the compressor unit, draws in air at the inlet, cools it, and then returns it to the inlet. The generator 13 is connected to and receives a heat source provided by the thermal power unit to heat the absorbent liquid, and sends the steam generated by heating to the condenser 14. The condenser 14 condenses the steam into liquid refrigerant and sends it to the evaporator 15. The evaporator 15 vaporizes the liquid refrigerant, absorbs heat to cool the drawn air, and sends the vaporized refrigerant vapor to the absorber 16. The absorber 16 absorbs the refrigerant vapor into the absorbent liquid to generate concentrated absorbent liquid, which is then sent to the generator 13.

[0032] The refrigeration unit in this embodiment is a lithium bromide refrigeration unit. The generator 13 is driven by the thermal energy of the thermal power unit to heat the absorbent liquid and generate steam. The steam is liquefied in the condenser 14 and then enters the evaporator 15 to vaporize and absorb heat, thereby cooling the air at the compressor inlet. The evaporated refrigerant vapor is absorbed by the absorbent liquid in the absorber 16 and then sent back to the generator 13 to form a continuous refrigeration cycle, which effectively reduces the inlet air temperature of the compressed air energy storage system and improves the system efficiency.

[0033] like Figure 1As shown in the upper part, in order to achieve coordinated operation of power generation and heating and cascade utilization of energy, the thermal power unit includes a boiler 7, a steam turbine unit, a condenser 8, and a heater unit connected in sequence by circulating pipelines; the steam turbine unit is also connected to the heater unit by pipelines, and is connected to the generator 13 by pipelines through the extraction steam control valve 11; the output pipeline of the boiler 7 is connected to the steam turbine unit to transport high-pressure steam generated by coal-fired heating feedwater; the high-pressure steam in the steam turbine unit expands to do work and reduces pressure and temperature, generating the input steam required by the generator 13, the exhaust steam used for heating in the heater unit, and the exhaust steam input to the condenser 8; the condenser 8 condenses the input exhaust steam into condensate through cooling water and sends it to the heater unit; the heater unit heats the condensate and returns it to the boiler 7 as feedwater.

[0034] The thermal power unit coupled compressed air energy storage system in this embodiment utilizes the steam extracted from the thermal power unit's turbine as a heat source to drive an absorption chiller to generate cooling capacity. This cooling capacity is then used to cool the high-temperature compressor inlet air. By reducing the compressor inlet air temperature, the compression time is shortened, and the total power consumption during the compression process is reduced. Furthermore, this embodiment does not use compressed air energy storage to drive the chiller; instead, it uses a separate power source (steam extracted from the turbine) to drive the chiller, thus not affecting the original compression power of the compressed air energy storage system.

[0035] like Figure 1 In a specific structure of a steam turbine unit shown, in order to ensure power generation efficiency while realizing combined heat and power (CHP) function, the steam turbine unit includes a high-pressure cylinder 6.1, an intermediate-pressure cylinder 6.2, a first low-pressure cylinder 6.3, and a second low-pressure cylinder 6.4 connected coaxially in sequence. The first output pipeline of the boiler 7 is connected to the high-pressure cylinder 6.1 to output high-pressure steam, and the four-stage series arrangement realizes the cascade utilization of steam energy. The high-pressure steam in the high-pressure cylinder 6.1 expands and does work, and after dropping to the reheat pressure, it is returned to the reheater of the boiler 7. The second output pipeline of the boiler 7 is connected to the intermediate-pressure cylinder 6.2 to output the reheated steam from the reheater. After the reheated steam in the intermediate-pressure cylinder 6.2 expands and does work, it is respectively delivered to the extraction control valve 11 and the first low-pressure cylinder 6.3 connected by the pipeline. After the steam in the first low-pressure cylinder 6.3 and the second low-pressure cylinder 6.4 expands and does work in sequence, it is discharged to the condenser 8 connected by the pipeline.

[0036] like Figure 1In the specific structure and connection method of the heater group shown, in order to improve the thermal efficiency of the thermal power unit and the quality of the boiler feedwater, the thermal power unit also includes a deaerator 12. The deaerator 12 is used to remove dissolved oxygen and other non-condensable gases from the boiler feedwater to prevent corrosion of the thermal equipment. The heater group includes a high-pressure heater group and a low-pressure heater group. The high-pressure heater group includes a first heater 10.1, a second heater 10.2, and a third heater 10.3 connected in sequence by pipelines. The low-pressure heater group includes a fourth heater 10.4, a fifth heater 10.5, a sixth heater 10.6, and a seventh heater 10.7 connected in sequence by pipelines. The high-pressure cylinder 6.1 also has two outputs, which are respectively connected to the first... The first and second heaters gradually reduce pressure and exhaust steam; the intermediate-pressure cylinder 6.2 also has one output pipeline directly connected to the deaerator 12, and another pipeline connected to the third heater 10.3 via the extraction steam control valve 11; the first and second low-pressure cylinders also have their outputs combined into four pipelines, which are connected to the fourth to seventh heaters for gradual pressure reduction and exhaust; the condensate output from the condenser 8 pipeline is preheated sequentially by the seventh to fourth heaters before entering the deaerator 12; the condensate formed by the preheating of condensate by each low-pressure heater flows back to the condenser 8 via a series of pipelines; the deoxygenated water output from the deaerator 12 pipeline is heated sequentially by the third to first heaters and then used as feedwater for the boiler 7; the condensate formed by the heating of deoxygenated water by each high-pressure heater flows back to the deaerator 12 via a series of pipelines. The heater group uses the steam extracted from the turbine unit to heat the condensate and feedwater, increasing the feedwater temperature entering the boiler 7 and improving the heat exchange efficiency of the boiler 7.

[0037] To further improve system energy efficiency and optimize thermodynamic cycle efficiency, this embodiment adopts a multi-stage heat recovery design, specifically including: generator 13 is also connected to condenser 8 via piping; the intermediate-pressure cylinder 6.2 sends part of its steam to generator 13 via extraction steam control valve 11 as a heat source for heat exchange; the exhaust steam after heat exchange is returned to condenser 8 for recycling and reuse, avoiding direct energy loss; evaporator 15 also sends cooling water to condenser 8 via piping for thermal integration with the main cycle system. This composite heat exchange network design improves the overall system efficiency: firstly, the rational utilization of extraction steam achieves efficient recovery of waste heat from intermediate-pressure cylinder exhaust, reducing system heat consumption rate; secondly, the coordinated operation of generator and condenser optimizes the thermodynamic state of the working fluid, improving cycle efficiency; finally, the closed-loop management of cooling water reduces the energy consumption of auxiliary systems, resulting in good economic and environmental benefits.

[0038] like Figure 1 As shown, the thermal power unit also includes a generator 9, which is connected to the end output of the steam turbine unit to convert the mechanical energy of the steam turbine into electrical energy. The thermal power unit is a comprehensive energy system integrating power generation and energy supply. Although it serves as the heat source for the refrigeration unit in this embodiment, it does not affect its original primary function of power generation.

[0039] like Figure 1 In the specific connection structure of the compressor unit shown in the lower left corner, the thermal power unit coupled compressed air energy storage system also includes three interstage heat exchangers 2. The compressor unit includes a first compressor 1.1, a second compressor 1.2, a third compressor 1.3 and a fourth compressor 1.4 connected in series. Interstage heat exchangers 2 are provided between adjacent compressors, and the hot side output ends of each interstage heat exchanger 2 are connected in parallel.

[0040] The thermal power unit coupled compressed air energy storage system in this embodiment adopts a four-stage compressor (first compressor 1.1 to fourth compressor 1.4) arranged in series. The main unit pressurizes the compressor, and interstage heat exchangers 2 are set between adjacent compressors to form a "compression-cooling-recompression" cascade processing flow. The cold side output end of the interstage heat exchanger 2 reduces the temperature rise of each stage of compression by cooling the compressed air to reduce the overall power consumption. Its hot side output end adopts a parallel connection method to ensure uniform distribution of heat exchange medium and improve waste heat recovery efficiency.

[0041] like Figure 1 As shown, the compressor unit inlet supplies air to the refrigeration unit through the intake pipe, and the refrigeration unit supplies cooled air back to the compressor unit inlet through the return pipe. The intake pipe and the return pipe are respectively equipped with air flow control valves 17, and the air flow control valves 17 are signal connected to the temperature sensor.

[0042] In this embodiment, the air flow control valve 17 is connected to the temperature sensor signal at the compressor unit inlet. When the temperature exceeds the limit, it automatically adjusts the cooling air flow to maintain the set temperature range.

[0043] like Figure 1 As shown, the thermal power unit coupled compressed air energy storage system also includes a gas storage system 4, a heat storage system 5, and a turbine expander unit; the output of the fourth compressor 1.4 is connected to the gas storage system 4, the gas storage system 4 stores high-pressure air and is connected to the inlet of the turbine expander unit; the turbine expander unit includes three turbine expanders 3 connected in sequence; an interstage heat exchanger 2 is provided between adjacent turbine expanders 3; the hot-side output end of each interstage heat exchanger 2 is connected in parallel to the heat storage system 5; the gas storage system 4 releases high-pressure air, which flows through the turbine expanders 3 in sequence to expand and do work, and absorbs heat from the heat storage system 5 in the interstage heat exchanger 2 to drive the generator.

[0044] In one specific embodiment, the thermal power unit coupled compressed air energy storage system stores the high-pressure air generated by the fourth compressor 1.4 through the air storage system 4. During the energy release stage, the high-pressure air flows through three series-connected turbine expanders 3 to expand and do work. The interstage heat exchangers 2 set between adjacent turbine expanders 3 absorb heat from the parallel-connected heat storage system 5 to reheat the air in the expansion chamber, thereby improving the working efficiency of the turbine unit and driving the generator to generate electricity, realizing the energy release and power generation conversion of compressed air.

[0045] In this embodiment, the thermal power unit coupled compressed air energy storage system detects that if the compressor inlet temperature is higher than the design value (15°C) by the temperature sensor at the compressor inlet, it transmits a signal to the air flow control valve 17 and the turbine flow control valve 11, and issues a command to open the air flow control valve 17 and the extraction steam control valve 11. The extraction steam control valve 11 adjusts the extraction steam flow to output steam to the generator 13, drive the refrigeration unit to work, cool the air and return it to the compressor inlet.

[0046] The embodiments of the present utility model have been described above with reference to the accompanying drawings. However, the present utility model is not limited to the specific embodiments described above. The specific embodiments described above are merely illustrative and not restrictive. Those skilled in the art can make many other forms under the guidance of the present utility model without departing from the spirit and scope of the claims. All of these forms are within the protection scope of the present utility model.

Claims

1. A thermal power unit coupled compressed air energy storage system, characterized in that, It includes a compressor unit for compressing air, a refrigeration unit for cooling air, and a thermal power unit that provides a heat source for the refrigeration unit; the compressor unit is equipped with a temperature sensor at its inlet to detect the air temperature, and the temperature sensor signal is connected to the refrigeration unit and the thermal power unit. The thermal power unit is connected to the refrigeration unit to provide the heat source required for cooling its air, and the refrigeration unit is connected to the compressor inlet to deliver cooled air.

2. The thermal power unit coupled compressed air energy storage system according to claim 1, characterized in that, The refrigeration unit includes a generator (13), a condenser (14), an evaporator (15), and an absorber (16) connected in sequence by circulating pipelines; the evaporator (15) is connected to the inlet of the compressor unit to draw in air at the inlet, cool it, and then return it to the inlet; The generator (13) is connected to and receives the heat source heating absorption liquid provided by the thermal power unit, and delivers the steam generated by heating to the condenser (14). The condenser (14) condenses the vapor into liquid refrigerant and then delivers it to the evaporator (15). The evaporator (15) vaporizes the liquid refrigerant to absorb heat and cool the extracted air, and delivers the vaporized refrigerant vapor to the absorber (16). The absorber (16) absorbs refrigerant vapor into the absorbent to generate concentrated absorbent, which is then transported to the generator (13).

3. The thermal power unit coupled compressed air energy storage system according to claim 2, characterized in that, The thermal power unit includes a boiler (7), a steam turbine, a condenser (8), and a heater unit connected in sequence by circulating pipelines; the steam turbine is also connected to the heater unit by pipelines, and is connected to the generator (13) by pipelines through the extraction steam control valve (11). The output pipeline of the boiler (7) is connected to the steam turbine unit to transport high-pressure steam generated by coal-fired heating feedwater; The high-pressure steam in the turbine unit expands to do work, reducing pressure and temperature, generating the input steam required for the generator (13), the exhaust steam used for heating the heater group, and the exhaust steam input to the condenser (8); The condenser (8) condenses the incoming exhaust steam into condensate through cooling water and delivers it to the heater group; The heater group heats the condensate and then feeds it back to the boiler (7).

4. The thermal power unit coupled compressed air energy storage system according to claim 3, characterized in that, The turbine unit includes a high-pressure cylinder (6.1), an intermediate-pressure cylinder (6.2), a first low-pressure cylinder (6.3), and a second low-pressure cylinder (6.4) connected coaxially in sequence. The first output pipe of the boiler (7) is connected to the high-pressure cylinder (6.1) to output high-pressure steam; The high-pressure steam in the high-pressure cylinder (6.1) expands and does work, and after being reduced to the reheat pressure, it is sent back to the reheater of the boiler (7); The second output pipeline of the boiler (7) is connected to the intermediate pressure cylinder (6.2) to output the reheated steam from the reheater; After the reheated steam expands and does work in the intermediate pressure cylinder (6.2), it is delivered to the extraction steam control valve (11) and the first low pressure cylinder (6.3) connected by the pipeline. After the steam in the first low-pressure cylinder (6.3) and the second low-pressure cylinder (6.4) connected by the pipeline expands and does work in sequence, it is discharged to the condenser (8) connected by the pipeline.

5. The thermal power unit coupled compressed air energy storage system according to claim 4, characterized in that, The thermal power unit also includes a deaerator (12), and the heater group includes a high-pressure heater group and a low-pressure heater group; The high-pressure heater assembly includes a first heater (10.1), a second heater (10.2), and a third heater (10.3) connected in sequence by pipelines. The low-pressure heater group includes a fourth heater (10.4), a fifth heater (10.5), a sixth heater (10.6), and a seventh heater (10.7) connected in sequence by pipelines. The high-pressure cylinder (6.1) also has two outputs, which are connected to the first and second heaters respectively and the steam is discharged by step-by-step pressure reduction; The intermediate pressure cylinder (6.2) also has one output pipeline directly connected to the deaerator (12), and another pipeline connected to the third heater (10.3) via the extraction steam control valve (11). The first and second low-pressure cylinders also output four paths, which are respectively connected to the fourth to seventh heaters to gradually reduce the pressure and exhaust steam. The condensate output from the condenser (8) pipeline is preheated by the seventh to fourth heaters in sequence before being fed into the deaerator (12). The condensate formed by the preheating of the condensate in each low-pressure heater flows back to the condenser (8) through a series of pipelines. The deoxygenated water output from the deaerator (12) pipeline is heated sequentially by the third to the first heaters and then fed into the boiler (7) as feedwater. The condensate formed by heating the deoxygenated water by each high-pressure heater flows back to the deaerator (12) through a series of pipelines.

6. The thermal power unit coupled compressed air energy storage system according to claim 4, characterized in that, The generator (13) is also connected to the condenser (8) via a pipeline. The intermediate pressure cylinder (6.2) delivers steam to the generator (13) for heat exchange through the extraction steam control valve (11). The exhaust steam after heat exchange is returned to the condenser (8) via a pipeline. The evaporator (15) also delivers cooling water to the condenser (8) via a pipeline.

7. The thermal power unit coupled compressed air energy storage system according to any one of claims 3 to 6, characterized in that, The thermal power unit also includes a generator (9), which is connected to the end output of the steam turbine unit to convert the mechanical energy of the steam turbine into electrical energy.

8. The thermal power unit coupled compressed air energy storage system according to claim 1, characterized in that, It also includes three interstage heat exchangers (2). The compressor unit includes a first compressor (1.1), a second compressor (1.2), a third compressor (1.3) and a fourth compressor (1.4) connected in series. Interstage heat exchangers (2) are provided between adjacent compressors, and the hot side output ends of each interstage heat exchanger (2) are connected in parallel.

9. The thermal power unit coupled compressed air energy storage system according to claim 1, characterized in that, The compressor unit inlet supplies air to the refrigeration unit through the intake pipe, and the refrigeration unit supplies cooled air back to the compressor unit inlet through the return pipe. The intake pipe and the return pipe are respectively equipped with air flow control valves (17), and the air flow control valves (17) are connected to the temperature sensor.

10. The thermal power unit coupled compressed air energy storage system according to claim 8, characterized in that, It also includes a gas storage system (4), a thermal storage system (5), and a turbine expander unit; The output of the fourth compressor (1.4) is connected to the gas storage system (4), which stores high-pressure air and is connected to the inlet of the turbine expander unit. The turbine expander unit includes three turbine expanders (3) connected in sequence. An interstage heat exchanger (2) is provided between adjacent turbine expanders (3). The hot-side output of each interstage heat exchanger (2) is connected in parallel to the heat storage system (5). The gas storage system (4) releases high-pressure air, which flows through the turbine expander (3) to expand and do work, and absorbs the heat from the heat storage system (5) in the interstage heat exchanger (2) to drive the generator.

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