Compressed air energy storage system and its operation method

Abstract

This invention relates to the field of compressed air energy storage technology, and discloses a compressed air energy storage system and its operation method. In the system, an ejector gas storage tank is connected to a high-pressure ejector via a first pipeline; the ejector gas storage tank is connected to a medium-pressure ejector via a second pipeline; the main gas storage tank is connected to the high-pressure ejector via a third pipeline; the high-pressure ejector is connected to the medium-pressure ejector via a fourth pipeline; the high-pressure turbine is connected to the main gas storage tank via a fifth pipeline; the high-pressure turbine is connected to the high-pressure ejector via a sixth pipeline; the medium- and low-pressure turbines are connected to the high-pressure turbine via a seventh pipeline; and the medium- and low-pressure turbines are connected to the medium-pressure ejector via an eighth pipeline. This invention utilizes the coordinated operation of zoned gas storage tanks and high-pressure ejectors to inject low-pressure air with high-pressure air to achieve pressurization, thus broadening the sliding pressure utilization range of the main gas storage tank and improving the utilization rate of compressed air. By setting up a medium-pressure ejector for injection, turbine throttling losses are avoided, while simultaneously increasing the working air flow rate and improving the system's circulation efficiency.

Description

Technical Field

[0001] This invention relates to the field of compressed air energy storage technology, specifically to compressed air energy storage systems and operating methods. Background Technology

[0002] Against the backdrop of the rapid development of the new energy industry, the challenge of integrating new energy sources has become a core bottleneck restricting the construction of new power systems. Compressed air energy storage, as a key technology in the field of long-term, large-scale energy storage, plays an important role in improving grid stability and promoting the integration of renewable energy, while also possessing significant advantages such as large storage capacity, high technological maturity, and outstanding commercial application potential.

[0003] However, the high cost of compressed air energy storage systems restricts their widespread application, and the low utilization rate of gas storage facilities is one of the key factors contributing to the high cost of compressed air energy storage systems.

[0004] In existing technologies, most compressed air energy storage systems operate at constant pressure, resulting in very low utilization capacity of the gas storage tank. Although some units operate at sliding pressure, they cannot increase the sliding pressure range of the gas storage tank, thus failing to improve the utilization rate of the gas storage tank. Summary of the Invention

[0005] This invention provides a compressed air energy storage system and its operation method to solve the problem that existing compressed air energy storage systems cannot increase the sliding pressure range of the gas storage tank, thus failing to improve the utilization rate of the gas storage tank.

[0006] In a first aspect, the present invention provides a compressed air energy storage system, comprising a high-pressure ejector, a medium-pressure ejector, an ejector gas storage tank, a main gas storage tank, a high-pressure turbine, and a medium-low-pressure turbine. The ejector gas storage tank is connected to the high-pressure ejector via a first pipeline, the ejector gas storage tank is connected to the medium-pressure ejector via a second pipeline, the main gas storage tank is connected to the high-pressure ejector via a third pipeline, the high-pressure ejector is connected to the medium-pressure ejector via a fourth pipeline, the high-pressure turbine is connected to the main gas storage tank via a fifth pipeline, the high-pressure turbine is connected to the high-pressure ejector via a sixth pipeline, the medium-low-pressure turbine is connected to the high-pressure turbine via a seventh pipeline, and the medium-low-pressure turbine is connected to the medium-pressure ejector via an eighth pipeline.

[0007] Beneficial effects: This invention utilizes a zoned gas storage unit and a high-pressure ejector to pressurize low-pressure air by using high-pressure air to eject it, thus expanding the sliding pressure utilization range of the main gas storage unit and improving the utilization rate of compressed air. By setting up a medium-pressure ejector, high-pressure / medium-pressure air is used as the gas source for injection and replenishment, avoiding turbine throttling losses and increasing the working air flow rate, thereby improving the system's circulation efficiency.

[0008] In one alternative implementation, the compressed air energy storage system further includes a first heat exchanger disposed on the fifth pipeline.

[0009] Beneficial effects: The invention provides a first heat exchanger on the fifth pipeline, which can preheat the compressed air input to the high-pressure turbine and increase the intake air temperature.

[0010] In one alternative implementation, the compressed air energy storage system further includes a second heat exchanger disposed on the seventh pipeline.

[0011] Beneficial effects: The invention provides a second heat exchanger on the seventh pipeline, which can preheat the compressed air input to the low-pressure turbine and increase the intake air temperature.

[0012] In one alternative implementation, the ejector gas storage cell and the main gas storage cell are equipped with pressure sensors.

[0013] In one optional embodiment, the compressed air energy storage system further includes a first regulating valve, a second regulating valve, a third regulating valve, a fourth regulating valve, a fifth regulating valve, and a sixth regulating valve. The first regulating valve is disposed on a first pipeline, the second regulating valve is disposed on a second pipeline, the third regulating valve is disposed on a third pipeline, the fourth regulating valve is disposed on a fourth pipeline, the first regulating valve is disposed on a fifth pipeline, and the sixth regulating valve is disposed on a sixth pipeline.

[0014] In one alternative implementation, the first regulating valve, the second regulating valve, the third regulating valve, the fourth regulating valve, the fifth regulating valve, and the sixth regulating valve are connected to the pressure sensor signal.

[0015] Beneficial effects: By connecting the regulating valves on each pipeline to the pressure sensor signal, the present invention can automatically control and regulate the flow rate of each pipeline according to the pressure value detected by the pressure sensor.

[0016] In one alternative implementation, several main gas storage facilities are connected in parallel.

[0017] Secondly, the present invention also provides a method for operating a compressed air energy storage system, applicable to the aforementioned compressed air energy storage system, the method comprising the following steps: The first, second, and third pipelines are closed, and the fifth pipeline is opened, allowing compressed air from the main gas storage tank to be input into the high-pressure turbine to perform work. Determine if the pressure in the main gas storage tank has dropped to the set value; If the pressure in the main gas storage tank drops to the set value, the second, fourth, and fifth pipelines will be closed, and the first, third, and sixth pipelines will be opened. Determine whether the pressure in the main gas storage facility has further decreased to the design pressure; If the pressure in the main gas storage tank drops to the design pressure, then the second and fifth pipelines will be closed, and the first, third, fourth, and sixth pipelines will be opened.

[0018] In one optional implementation, if the pressure in the main gas storage tank drops to the design pressure, the second and fifth pipelines are shut down, and the first, third, fourth, and sixth pipelines are opened. The process further includes: Close the fourth pipeline, open the second pipeline, and adjust the flow rate of the first pipeline to meet the minimum flow rate requirements of the high-pressure turbine.

[0019] In one optional implementation, after the steps of closing the fourth pipeline, opening the second pipeline, and adjusting the flow rate of the first pipeline to meet the minimum flow rate requirement of the high-pressure turbine, the method further includes: Determine whether the pressure in both the ejector gas storage tank and the main gas storage tank has decreased to the design value; If the pressure in both the ejector gas storage tank and the main gas storage tank drops to the design value, then all pipelines should be shut down and the high-pressure turbine and the low-pressure turbine should be stopped. Attached Figure Description

[0020] To more clearly illustrate the specific embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the specific embodiments or the prior art will be briefly introduced below. Obviously, the drawings described below are some embodiments of the present invention. For those skilled in the art, other drawings can be obtained from these drawings without creative effort.

[0021] Figure 1 This is a schematic diagram of a compressed air energy storage system according to an embodiment of the present invention; Figure 2 This is a flowchart illustrating an operation method of a compressed air energy storage system according to an embodiment of the present invention.

[0022] Explanation of reference numerals in the attached figures: 1. High-pressure ejector; 2. Medium-pressure ejector; 3. Ejector gas storage tank; 4. Main gas storage tank; 5. High-pressure turbine; 6. Medium and low-pressure turbine; 7. First heat exchanger; 8. Second heat exchanger; 101. First pipeline; 102. Second pipeline; 103. Third pipeline; 104. Fourth pipeline; 105. Fifth pipeline; 106. Sixth pipeline; 107. Seventh pipeline; 108. Eighth pipeline; 201. First regulating valve; 202. Second regulating valve; 203. Third regulating valve; 204. Fourth regulating valve; 205. Fifth regulating valve; 206. Sixth regulating valve. Detailed Implementation

[0023] To make the objectives, technical solutions, and advantages of the embodiments of the present invention clearer, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of the present invention, not all embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of the present invention.

[0024] The following is combined Figures 1 to 2 The following describes embodiments of the present invention.

[0025] According to an embodiment of the present invention, in one aspect, such as Figure 1 As shown, a compressed air energy storage system is provided, including a high-pressure ejector 1, a medium-pressure ejector 2, an ejector air storage tank 3, a main air storage tank 4, a high-pressure turbine 5, and a medium-low pressure turbine 6. The ejector air storage tank 3 is connected to the high-pressure ejector 1 by a first pipeline 101, the ejector air storage tank 3 is connected to the medium-pressure ejector 2 by a second pipeline 102, the main air storage tank 4 is connected to the high-pressure ejector 1 by a third pipeline 103, the high-pressure ejector 1 is connected to the medium-pressure ejector 2 by a fourth pipeline 104, the high-pressure turbine 5 is connected to the main air storage tank 4 by a fifth pipeline 105, the high-pressure turbine 5 is connected to the high-pressure ejector 1 by a sixth pipeline 106, the medium-low pressure turbine 6 is connected to the high-pressure turbine 5 by a seventh pipeline 107, and the medium-low pressure turbine 6 is connected to the medium-pressure ejector 2 by an eighth pipeline 108.

[0026] Specifically, in this embodiment, the gas storage adopts a zoned operation mode. During the energy release phase of the compressed air energy storage system, one group of gas storage is reserved as ejector gas storage 3 to maintain a high-pressure state, while the remaining gas storage serves as the main gas storage 4 to input power to the turbine unit for power generation.

[0027] In this embodiment, a high-pressure ejector 1 is installed. When the pressure in most of the main gas storage tank 4 drops to a set value, the high-pressure air in the ejector gas storage tank 3 is used to eject the low-pressure air in the main gas storage tank 4, forming medium-pressure compressed air that is input into the turbine unit to generate electricity. This further reduces the pressure in the main gas storage tank 4, significantly improving the utilization rate of compressed air in the main gas storage tank 4 compared to conventional sliding pressure operation gas storage tanks.

[0028] In this embodiment, a medium-pressure ejector 2 is provided, using high-pressure or medium-pressure compressed air from the ejector gas storage tank 3 as the ejector gas source. Through the medium-pressure ejector 2, the ejected air forms compressed air that meets the pressure requirements of the low-pressure cylinder of the medium-low pressure turbine 6, and is then input into the turbine to generate electricity. Using the medium-pressure ejector 2 to eject air avoids the throttling losses associated with the low-pressure cylinder of the medium-low pressure turbine 6, and also increases the mass flow rate of the air entering the medium-low pressure turbine 6, thereby enhancing its power generation capacity.

[0029] In this embodiment, the ejector gas storage tank 3 is connected to the high-pressure ejector 1 via the first pipeline 101 and to the medium-pressure ejector 2 via the second pipeline 102. The main gas storage tank 4 is connected to the high-pressure ejector 1 via the third pipeline 103. The high-pressure ejector 1 is connected to the medium-pressure ejector 2 via the fourth pipeline 104. The main gas storage tank 4 is connected to the high-pressure turbine 5 via the fifth pipeline 105. The high-pressure ejector 1 is connected to the high-pressure turbine 5 via the sixth pipeline 106. The high-pressure turbine 5 is connected to the medium-low pressure turbine 6 via the seventh pipeline 107. The medium-pressure ejector 2 is connected to the medium-low pressure turbine 6 via the eighth pipeline 108.

[0030] In this embodiment, the operation of the compressed air energy storage system is divided into three stages. By switching the pipelines on and off and starting and stopping the ejector, the sliding pressure range of the main gas storage tank 4 is expanded and energy is utilized efficiently. In the first stage of energy release, namely the high-pressure operation stage of the main gas storage tank 4, the ejector gas storage tank 3 remains closed, and only the fifth pipeline 105 is kept connected. High-pressure gas enters the high-pressure turbine 5 from the main gas storage tank 4 to do work. The system operates in the conventional sliding pressure mode, and the pressure of the main gas storage tank 4 gradually decreases from the rated pressure.

[0031] When the pressure inside the main gas storage tank 4 drops to the set value, the system switches to the second stage, namely the high-pressure ejector coordinated operation stage. The second pipeline 102, the fourth pipeline 104, and the fifth pipeline 105 are disconnected, while the first pipeline 101, the third pipeline 103, and the sixth pipeline 106 are connected. In this stage, high-pressure air from the ejector gas storage tank 3 is used to eject low-pressure air from the main gas storage tank 4 via the high-pressure ejector 1. After being pressurized, the air is input into the high-pressure turbine 5 to perform work. The pressure in the ejector gas storage tank 3 slowly decreases, and the pressure in the main gas storage tank 4 further decreases, improving the sliding pressure range and utilization rate of the main gas storage tank 4.

[0032] When the pressure inside the main gas storage tank 4 further decreases to the design pressure, it is necessary to replenish the gas supply through the medium-low pressure turbine 6 to achieve full-power power generation. The system then switches to the third stage, namely the high- and medium-pressure ejector coordinated operation stage. At this time, the second pipeline 102 and the fifth pipeline 105 are disconnected, and the first pipeline 101, the third pipeline 103, the fourth pipeline 104, and the sixth pipeline 106 are connected to eject the high-pressure compressed air in the gas storage tank 3. After the high-pressure ejector 1 ejects and pressurizes the medium- and low-pressure air in the main gas storage tank 4, it is input into the high-pressure turbine 5 to do work. The other output of the high-pressure ejector 1 is used to eject air through the medium-pressure ejector 2 and then input into the medium- and low-pressure turbine 6 to expand and do work, supplementing the power generation. When the pressure decreases further, the fourth pipeline 104 is disconnected, the second pipeline 102 is connected, and the flow rate of the first pipeline 101 is adjusted to meet the minimum flow requirement of the high-pressure turbine 5. Air is then ejected directly into the medium-pressure ejector 2 via the ejector gas storage tank 3 and input into the medium- and low-pressure turbine 6 for expansion and work, supplementing the power generation. When the pressures of both the ejector gas storage tank 3 and the main gas storage tank 4 decrease to their design values, the system energy release ends, all regulating valves are closed, and the turbine unit shuts down.

[0033] This invention utilizes a zoned gas storage unit in conjunction with a high-pressure ejector 1 to pressurize low-pressure air by using high-pressure air to eject it, thereby expanding the sliding pressure utilization range of the main gas storage unit 4 and improving the utilization rate of compressed air. By setting up a medium-pressure ejector 2, high-pressure / medium-pressure air is used as the gas source for ejection and replenishment, avoiding turbine throttling losses and increasing the working air flow rate, thus improving the system's circulation efficiency.

[0034] In one embodiment, such as Figure 1 As shown, the compressed air energy storage system also includes a first heat exchanger 7, which is installed on the fifth pipeline 105.

[0035] Specifically, in this embodiment, the compressed air stored in the main air storage tank 4 and the ejector air storage tank 3 has a low temperature. After being heated by the first heat exchanger 7, the intake temperature of the high-pressure turbine 5 can be increased, thereby improving its working efficiency.

[0036] In this embodiment, the compressed air output from the main gas storage tank 4 and the high-pressure ejector 1 is first input into the first heat exchanger 7 and then into the high-pressure turbine 5.

[0037] The present invention provides a first heat exchanger 7 on the fifth pipeline 105, which can preheat the compressed air input to the high-pressure turbine 5 and increase the intake air temperature.

[0038] In one embodiment, such as Figure 1 As shown, the compressed air energy storage system also includes a second heat exchanger 8, which is installed on the seventh pipeline 107.

[0039] Specifically, in this embodiment, the compressed air output by the medium-pressure ejector 2 is first input into the second heat exchanger 8 and then into the medium-low pressure turbine 6.

[0040] The present invention provides a second heat exchanger 8 on the seventh pipeline 107, which can preheat the compressed air input to the low-pressure turbine 6 and increase the intake air temperature.

[0041] In one embodiment, the ejector gas storage cell 3 and the main gas storage cell 4 are equipped with pressure sensors.

[0042] Specifically, in this embodiment, pressure sensors are installed on the outlet pipelines of both the ejector gas storage tank 3 and the main gas storage tank 4 to monitor the pressure inside the tanks in real time.

[0043] In one embodiment, such as Figure 1As shown, the compressed air energy storage system also includes a first regulating valve 201, a second regulating valve 202, a third regulating valve 203, a fourth regulating valve 204, a fifth regulating valve 205, and a sixth regulating valve 206. The first regulating valve 201 is installed on the first pipeline 101, the second regulating valve 202 is installed on the second pipeline 102, the third regulating valve 203 is installed on the third pipeline 103, the fourth regulating valve 204 is installed on the fourth pipeline 104, the first regulating valve 201 is installed on the fifth pipeline 105, and the first regulating valve 201 is installed on the sixth pipeline 106.

[0044] Specifically, in this embodiment, the first regulating valve 201, the second regulating valve 202, the third regulating valve 203, the fourth regulating valve 204, the fifth regulating valve 205, and the sixth regulating valve 206 are flow regulating valves.

[0045] In one embodiment, the first regulating valve 201, the second regulating valve 202, the third regulating valve 203, the fourth regulating valve 204, the fifth regulating valve 205, and the sixth regulating valve 206 are connected to the pressure sensor signal.

[0046] Specifically, in this embodiment, the opening degree of each flow regulating valve can be automatically or manually adjusted according to the actual pressure changes of the ejector gas storage tank 3 and the main gas storage tank 4, as well as the output requirements of the high-pressure turbine 5 and the medium and low-pressure turbine 6, so as to play the role of system control.

[0047] This invention connects the regulating valves on each pipeline to the pressure sensor signal, enabling automatic control and adjustment of the flow rate of each pipeline based on the pressure value detected by the pressure sensor.

[0048] In one embodiment, such as Figure 1 As shown, several main gas storage units are connected in parallel.

[0049] Specifically, in this embodiment, several main gas storage tanks 4 are connected in parallel on the same main pipeline, and the third pipeline 103 and the fifth pipeline 105 are respectively connected to the main pipeline.

[0050] According to an embodiment of the present invention, on the other hand, such as Figure 2 As shown, a method for operating a compressed air energy storage system is also provided, applicable to the aforementioned compressed air energy storage system. The method includes the following steps: S101: Close the first pipeline 101, the second pipeline 102 and the third pipeline 103, open the fifth pipeline 105, and the compressed air in the main gas storage tank 4 is input into the high-pressure turbine 5 to do work; S102: Determine whether the pressure in the main gas storage tank 4 has dropped to the set value; S103: If the pressure of the main gas storage tank 4 drops to the set value, then close the second pipeline 102, the fourth pipeline 104 and the fifth pipeline 105, and open the first pipeline 101, the third pipeline 103 and the sixth pipeline 106. S104: Determine whether the pressure in the main gas storage tank 4 has been further reduced to the design pressure; S105: If the pressure in the main gas storage tank 4 drops to the design pressure, then close the second pipeline 102 and the fifth pipeline 105, and open the first pipeline 101, the third pipeline 103, the fourth pipeline 104 and the sixth pipeline 106.

[0051] Specifically, in this embodiment, the operation of the compressed air energy storage system is divided into three stages. By opening and closing the flow regulating valve in the pipeline and starting and stopping the ejector, the sliding pressure range of the main gas storage tank 4 is expanded and energy is utilized efficiently. In the first stage of energy release, namely the high-pressure operation stage of the main gas storage tank 4, the ejector gas storage tank 3 is kept closed, the first regulating valve 201 and the second regulating valve 202 are closed, and only the fifth regulating valve 205 in the fifth pipeline 105 is kept open. The high-pressure gas enters the first heat exchanger 7 from the main gas storage tank 4, is heated, and then enters the high-pressure turbine 5 to do work. The system operates in the conventional sliding pressure mode, and the pressure of the main gas storage tank 4 gradually decreases from the rated pressure.

[0052] When the pressure inside the main gas storage tank 4 drops to the set value, the system switches to the second stage, namely the high-pressure ejector coordinated operation stage. The second regulating valve 202 in the second pipeline 102, the fourth regulating valve 204 in the fourth pipeline 104, and the fifth regulating valve 205 in the fifth pipeline 105 are closed. The first regulating valve 201 in the first pipeline 101, the third regulating valve 203 in the third pipeline 103, and the sixth regulating valve 206 in the sixth pipeline 106 are opened. In this stage, high-pressure air from the ejector gas storage tank 3 is used to eject low-pressure air from the main gas storage tank 4 via the high-pressure ejector 1. After being pressurized and heated by the first heat exchanger 7, the air is input into the high-pressure turbine 5 to perform work. The pressure in the ejector gas storage tank 3 slowly decreases, and the pressure in the main gas storage tank 4 further decreases, improving the sliding pressure range and utilization rate of the main gas storage tank 4.

[0053] This invention utilizes a zoned gas storage unit in conjunction with a high-pressure ejector 1 to pressurize low-pressure air by using high-pressure air to eject it, thereby expanding the sliding pressure utilization range of the main gas storage unit 4 and improving the utilization rate of compressed air. By setting up a medium-pressure ejector 2, high-pressure / medium-pressure air is used as the gas source for ejection and replenishment, avoiding turbine throttling losses and increasing the working air flow rate, thus improving the system's circulation efficiency.

[0054] In one embodiment, such as Figure 2 As shown, S105: If the pressure in the main gas storage tank 4 drops to the design pressure, the steps of closing the second pipeline 102 and the fifth pipeline 105, and opening the first pipeline 101, the third pipeline 103, the fourth pipeline 104, and the sixth pipeline 106 further include: S106: Close the fourth pipeline 104, open the second pipeline 102, and adjust the flow rate of the first pipeline 101 to meet the minimum flow rate requirement of the high-pressure turbine 5.

[0055] Specifically, in this embodiment, when the pressure inside the main gas storage tank 4 further decreases to the design pressure, it is necessary to replenish the gas through the medium-low pressure turbine 6 to achieve full-power power generation. The system switches to the third stage, namely the high- and medium-pressure ejector coordinated operation stage. At this time, the second regulating valve 202 in the second pipeline 102 and the fifth regulating valve 205 in the fifth pipeline 105 are closed, and the first regulating valve 201 in the first pipeline 101, the third regulating valve 203 in the third pipeline 103, the fourth regulating valve 204 in the fourth pipeline 104, and the sixth regulating valve 206 in the sixth pipeline 106 are opened to eject the high-pressure compressed air in the gas storage tank 3. After the low-pressure air in the main gas storage tank 4 is ejected and pressurized by the high-pressure ejector 1, it is heated by the first heat exchanger 7 and then input into the high-pressure turbine 5 to do work. The other output of the high-pressure ejector 1 is ejected by the medium-pressure ejector 2, heated by the second heat exchanger 8, and then input into the medium- and low-pressure turbine 6 to expand and do work, supplementing the power generation. When the pressure decreases further, the fourth pipeline 104 is cut off, the second pipeline 102 is connected, and the flow rate of the first pipeline 101 is adjusted to meet the minimum flow rate requirement of the high-pressure turbine 5. After the air is ejected directly into the medium-pressure ejector 2 through the ejector gas storage tank 3, it is heated by the second heat exchanger 8 and then input into the medium-low pressure turbine 6 to expand and do work, supplementing the power generation.

[0056] In one embodiment, such as Figure 2 As shown, S106: After the steps of closing the fourth pipeline 104, opening the second pipeline 102, and adjusting the flow rate of the first pipeline 101 to meet the minimum flow rate requirement of the high-pressure turbine 5, the following steps are also included: S107: Determine whether the pressure of ejector gas storage 3 and main gas storage 4 has both decreased to the design value; S108: If the pressure of both ejector gas storage 3 and main gas storage 4 drops to the design value, then shut down all pipelines and stop the high-pressure turbine 5 and low-pressure turbine.

[0057] Specifically, in this embodiment, when the pressure of both the ejector gas storage tank 3 and the main gas storage tank 4 decreases to the design value, the system energy release ends, all regulating valves are closed, and the high-pressure turbine 5 and the medium- and low-pressure turbine 6 stop operating.

[0058] Although embodiments of the invention have been described in conjunction with the accompanying drawings, those skilled in the art can make various modifications and variations without departing from the spirit and scope of the invention, and such modifications and variations all fall within the scope defined by the appended claims.

Claims

1. A compressed air energy storage system, characterized in that, include: High-voltage ejector (1); Medium-pressure ejector (2); The ejector gas storage tank (3) is connected to the high-pressure ejector (1) by a first pipeline (101), and the ejector gas storage tank (3) is connected to the medium-pressure ejector (2) by a second pipeline (102). The main gas storage tank (4) is connected to the high-pressure ejector (1) by a third pipeline (103), and the high-pressure ejector (1) is connected to the medium-pressure ejector (2) by a fourth pipeline (104). High pressure turbine (5), the high pressure turbine (5) is connected to the main gas storage tank (4) by a fifth pipeline (105), and the high pressure turbine (5) is connected to the high pressure ejector (1) by a sixth pipeline (106). The medium-low pressure turbine (6) is connected to the high pressure turbine (5) by a seventh pipeline (107), and the medium-low pressure turbine (6) is connected to the medium pressure ejector (2) by an eighth pipeline (108).

2. The compressed air energy storage system of claim 1, wherein, Also includes: The first heat exchanger (7) is installed on the fifth pipeline (105).

3. The compressed air energy storage system of claim 1 or 2, wherein, Also includes: The second heat exchanger (8) is installed on the seventh pipeline (107).

4. The compressed air energy storage system of claim 1, wherein, Pressure sensors are provided in the ejector gas storage tank (3) and the main gas storage tank (4).

5. The compressed air energy storage system of claim 4, wherein, Also includes: The first regulating valve (201) is installed on the first pipeline (101); The second regulating valve (202) is installed on the second pipeline (102); The third regulating valve (203) is installed on the third pipeline (103); A fourth regulating valve (204) is provided on the fourth pipeline (104); The fifth regulating valve (205) is provided on the fifth pipeline (105), and the first regulating valve (201) is provided on the first pipeline (105). The sixth regulating valve (206) is provided on the sixth pipeline (106), and the first regulating valve (201) is provided on the first regulating valve (201).

6. The compressed air energy storage system of claim 5, wherein, The first regulating valve (201), the second regulating valve (202), the third regulating valve (203), the fourth regulating valve (204), the fifth regulating valve (205), and the sixth regulating valve (206) are connected to the pressure sensor signal.

7. The compressed air energy storage system according to claim 1, characterized in that, Several of the main gas storage units (4) are connected in parallel.

8. A method for operating a compressed air energy storage system, characterized in that, The compressed air energy storage system applied to any one of claims 1 to 7, the operation method includes the following steps: Close the first pipeline (101), the second pipeline (102) and the third pipeline (103), and open the fifth pipeline (105) so that compressed air in the main gas storage tank (4) is input into the high-pressure turbine (5) to do work; Determine whether the pressure in the main gas storage tank (4) has dropped to the set value; If the pressure of the main gas storage tank (4) drops to the set value, the second pipeline (102), the fourth pipeline (104) and the fifth pipeline (105) are closed, and the first pipeline (101), the third pipeline (103) and the sixth pipeline (106) are opened. Determine whether the pressure in the main gas storage cell (4) has further decreased to the design pressure; If the pressure of the main gas storage tank (4) drops to the design pressure, the second pipeline (102) and the fifth pipeline (105) are closed, and the first pipeline (101), the third pipeline (103), the fourth pipeline (104) and the sixth pipeline (106) are opened.

9. The operation method of the compressed air energy storage system according to claim 8, characterized in that, The step of closing the second pipeline (102) and the fifth pipeline (105) and opening the first pipeline (101), the third pipeline (103), the fourth pipeline (104) and the sixth pipeline (106) if the pressure of the main gas storage tank (4) drops to the design pressure also includes: Close the fourth pipeline (104), open the second pipeline (102), and adjust the flow rate of the first pipeline (101) to meet the minimum flow rate requirement of the high-pressure turbine (5).

10. The operation method of the compressed air energy storage system according to claim 9, characterized in that, After the steps of closing the fourth pipeline (104), opening the second pipeline (102), and adjusting the flow rate of the first pipeline (101) to meet the minimum flow rate requirement of the high-pressure turbine (5), the following steps are also included: Determine whether the pressure of both the ejector gas storage cell (3) and the main gas storage cell (4) has decreased to the design value; If the pressure of both the ejector gas storage tank (3) and the main gas storage tank (4) drops to the design value, then all pipelines will be shut down and the high-pressure turbine (5) and the low-pressure turbine will be stopped.

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