Air supply structure and compressed air energy storage system

Abstract

The utility model discloses an air supply structure and a compressed air energy storage system, the air supply structure is used for conveying air to a first compressor in the compressed air energy storage system, the air supply structure comprises an air chamber and at least one second compressor, the air chamber is provided with an air inlet and an air outlet, and the air outlet is selectively communicated with the first compressor. The second compressor can convey gas into the gas chamber through the gas inlet and can also directly convey gas to the first compressor. Therefore, the second compressor can directly convey gas to the first compressor, the second compressor can also convey gas into the gas chamber, and the gas chamber can store the gas conveyed by the second compressor, so that gas is supplemented to the first compressor when the first compressor runs at a low load and the gas displacement is insufficient, and the surge problem of the first compressor is restrained; and meanwhile, gas waste can be reduced, so that the operation cost of the compressed air energy storage system can be reduced.

Description

TECHNICAL FIELD

[0001] The utility model relates to new energy technology field especially, relate to a kind of air supplement structure and compressed air energy storage system. BACKGROUND

[0002] To cope with increasingly severe energy crisis and environmental pollution problems, China vigorously promotes the development of large-scale energy storage technology. Among them, CAES (Compressed Air Energy Storage, compressed air energy storage) system construction period is between pumped storage and electrochemical energy storage, with the significant advantages of not being limited by geographical conditions, flexible site selection, long service life, etc. It has become the research focus of large-scale energy storage technology.

[0003] In related technologies, to prevent the compressed air energy storage system from having a compressor surge problem during gas storage, the flow rate at the surge point of the compressor at maximum speed is usually taken as the limit value, and the flow rate during compressor operation is always greater than the limit value. However, when the compressor is running at low load, the limit flow is too much compared to the flow required by the compressor at low load, causing gas waste and increasing the operating cost of the compressed air energy storage system. SUMMARY

[0004] The present utility model aims to solve at least one of the technical problems existing in the prior art. To this end, the present utility model provides an air supplement structure that can suppress the surge of a first compressor and help reduce the operating cost of a compressed air energy storage system.

[0005] An air supplement structure is applied to a compressed air energy storage system and used to deliver gas to a first compressor in the system. The structure includes: a gas chamber with an air inlet and an air outlet, the outlet being in selective communication with the first compressor and used to deliver gas to the compressor; and at least one second compressor that can deliver gas to the gas chamber through the air inlet and directly to the first compressor.

[0006] According to the air supplement structure of the present utility model embodiment, the second compressor is connected to the first compressor and the gas chamber respectively, and the first compressor can be connected to the gas chamber. The second compressor can directly deliver gas to the first compressor, and also deliver gas to the gas chamber. The gas chamber can store the gas delivered by the second compressor to supplement the first compressor when it is running at low load and the exhaust volume is insufficient, suppressing the surge of the first compressor. At the same time, it can prevent gas waste caused by the actual flow of the gas being too much compared to the flow required by the compressor at low load, helping to reduce the operating cost of the compressed air energy storage system.

[0007] According to some embodiments of the present application, the second compressor is multiple, and the multiple second compressors are arranged in parallel with each other.

[0008] According to some embodiments of the present application, the air supplementing structure further comprises: a first connecting pipe section, which is connected between the air inlet side of the first compressor and the air outlet side of the second compressor; a second connecting pipe section, one end of which is in communication with the first connecting pipe section, and the other end of which is in communication with the air inlet; and a third connecting pipe section, one end of which is in communication with the air outlet, and the other end of which is in communication with the air inlet side of the first compressor.

[0009] According to some embodiments of the present application, the air supplementing structure further comprises: a first on-off valve, which is arranged in the first connecting pipe section and is used for selectively connecting the air outlet side of the second compressor with the air inlet side of the first compressor; a second on-off valve, which is arranged in the second connecting pipe section and is used for controlling the on-off state of the second connecting pipe section; and a third on-off valve, which is arranged in the third connecting pipe section and is used for controlling the on-off state of the third connecting pipe section.

[0010] According to some embodiments of the present application, the communication position of the second connecting pipe section with the first connecting pipe section is located upstream of the first on-off valve in the first connecting pipe section.

[0011] According to some embodiments of the present application, the air chamber comprises: a main body part, which has a cavity; and a partition plate, which is arranged in the cavity in a position-adjustable manner and is adapted to divide the cavity to form a first cavity in communication with the air inlet and the air outlet.

[0012] According to some embodiments of the present application, the air supplementing structure further comprises a driving device, which is connected with the partition plate and is used for driving the partition plate to move so as to adjust the volume of the first cavity.

[0013] According to some embodiments of the present application, the partition plate can further divide the cavity to form a second cavity, and the main body part is provided with a pressure adjusting opening in communication with the second cavity, which can be used for connecting the second cavity with the outside of the main body part.

[0014] Another object of the present application is to provide a compressed air energy storage system.

[0015] The compressed air energy storage system comprises the air supplementing structure.

[0016] The compressed air energy storage system has the same advantages as the air supplementing structure, and details are not repeated here.

[0017] According to some embodiments of the present application, the power of the first compressor is greater than the power of the second compressor.

[0018] Additional aspects and advantages of the present application will be described in part in the description that follows, and in part will become apparent to those skilled in the art upon examination of the following description or can be learned by practice of the present application. BRIEF DESCRIPTION OF DRAWINGS

[0019] The above and / or additional aspects and advantages of the present application will become apparent and be readily understood from the following description, taken in conjunction with the accompanying drawings, in which:

[0020] Figure 1 The air supplementing structure according to the embodiments of the present application is in communication with the first compressor of the compressed air energy storage system.

[0021] REFERENCE NUMERALS

[0022] The air supplementing structure 100,

[0023] The air chamber 110, the air inlet 111, the air outlet 112,

[0024] The main body 113, the cavity 1131, the first cavity 1131a, the second cavity 1131b, the pressure regulating port 1132,

[0025] The partition plate 114,

[0026] The second compressor 120,

[0027] The first connecting pipe section 130, the first on-off valve 131,

[0028] The second connecting pipe section 140, the second on-off valve 141,

[0029] The third connecting pipe section 150, the third on-off valve 151,

[0030] The driving device 160, the motor 161, the screw rod 162,

[0031] The first compressor 200. DETAILED DESCRIPTION

[0032] Embodiments of the present application are described in detail below, examples of which are shown in the accompanying drawings, wherein the same or similar reference numerals represent the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by reference to the accompanying drawings are exemplary and are only used to explain the present application, and cannot be understood as limiting the present application.

[0033] In the description of the utility model, it is necessary to understand that the orientation or positional relationship indicated by the terms "inner", "outer", "axial" and the like is based on the orientation or positional relationship shown in the drawings, and is only for the convenience of describing the utility model and simplifying the description, and does not indicate or imply that the device or element referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as a limitation on the utility model. In addition, the features limited by "first", "second" can explicitly or implicitly include one or more features. In the description of the utility model, unless otherwise specified, the meaning of "a plurality of" is two or more.

[0034] In the description of the utility model, it should be explained that, unless otherwise specified and limited, the terms "mounting", "connection", "connection" should be understood broadly, for example, it can be fixedly connected, or it can be detachably connected, or integrally connected, it can be mechanically connected, or it can be electrically connected, it can be directly connected, or it can be indirectly connected through an intermediate medium, it can be the communication inside two elements. For ordinary skilled in the art, the specific meaning of the above terms in the utility model can be understood according to the specific circumstances.

[0035] Reference is made below Figure 1 The air supplementing structure 100 according to the embodiment of the utility model is described.

[0036] According to the air supplementing structure 100 of the embodiment of the utility model, the air supplementing structure 100 is applied to a compressed air energy storage system, wherein the compressed air energy storage system is a new type of power energy storage system, which can store air by consuming electric energy in the energy storage stage, and release high-pressure air in the energy release stage and make power generation through the expander.

[0037] The air supplementing structure 100 is used for delivering gas to the first compressor 200 in the compressed air energy storage system, and the air supplementing structure 100 comprises an air chamber 110, the air chamber 110 has an air inlet 111 and an air outlet 112, the air outlet 112 is selectively communicated with the first compressor 200, and is used for delivering gas to the first compressor 200.

[0038] Exemplarily, the gas chamber 110 can be connected with other gas conveying structures (such as the second compressor 120 described below) through the gas inlet 111, and the gas entering the gas chamber 110 through the gas inlet 111 can be stored in the gas chamber 110. When the first compressor 200 needs to be supplemented with gas, the gas stored in the gas chamber 110 can be conveyed to the first compressor 200 through the gas outlet 112 to achieve the function of supplementing the first compressor 200 with gas, which is conducive to inhibiting the surge problem of the first compressor 200 caused by insufficient exhaust capacity of the first compressor 200, thereby being conducive to reducing the vibration and noise generated by the first compressor 200 during operation, and being conducive to improving the service life of the first compressor 200, so as to reduce the noise generated by the compressed air energy storage system during operation, and at the same time, be conducive to ensuring the normal operation of the compressed air energy storage system.

[0039] The gas supplementing structure 100 further comprises at least one second compressor 120, and the second compressor 120 can convey gas into the gas chamber 110 through the gas inlet 111, and the second compressor 120 can also directly convey gas to the first compressor 200.

[0040] Exemplarily, when the first compressor 200 does not need to be supplemented with gas, the second compressor 120 can be connected with the first compressor 200 alone to convey gas to the first compressor 200, or the second compressor 120 can be connected with the gas inlet 111 of the gas chamber 110 alone to convey gas into the gas chamber 110, and the gas chamber 110 can store the gas conveyed by the second compressor 120 to convey the gas to the first compressor 200 when the first compressor 200 needs to be supplemented with gas, thereby inhibiting the surge problem of the first compressor 200.

[0041] Specifically, the number of the second compressor 120 can be determined according to actual production requirements, and is not limited herein.

[0042] In the related art, in order to prevent the compressor from surging during the gas storage process of the compressed air energy storage system, the flow rate of the surge point of the compressor at the maximum speed is usually taken as a limit value, and the flow rate of the compressor during operation is always greater than the limit value. However, when the compressor is running at low load, the limit flow rate is too much compared with the flow rate required by the compressor at low load, thereby causing gas waste and increasing the operation cost of the compressed air energy storage system.

[0043] The second compressor 120 is connected with the first compressor 200 and the gas chamber 110 respectively, and the first compressor 200 can be connected with the gas chamber 110, the second compressor 120 can directly deliver gas to the first compressor 200, the second compressor 120 can also deliver gas into the gas chamber 110, and the gas chamber 110 can store the gas delivered by the second compressor 120 to supplement the first compressor 200 when the first compressor 200 is in low load operation and the exhaust volume is insufficient, thereby inhibiting the first compressor 200 from appearing the surge problem, preventing the waste of gas due to the actual flow of the gas being too much compared with the flow required by the compressor in low load operation, and facilitating to reduce the operation cost of the compressed air energy storage system.

[0044] As shown in Figure 1 In some embodiments of the utility model, the second compressor 120 is multiple, and the multiple second compressors 120 are arranged in parallel with each other.

[0045] By arranging multiple second compressors 120, the efficiency of the gas supplement structure 100 in delivering gas to the first compressor 200 is improved, thereby improving the energy storage efficiency of the compressed air energy storage system, and by arranging the multiple second compressors 120 in parallel with each other, the power required to start the gas supplement structure 100 is reduced, so as to start at least one of the multiple second compressors 120 when the new energy power generation is insufficient.

[0046] Referring to Figure 1 In some embodiments of the utility model, the gas supplement structure 100 further comprises: a first connecting pipe section 130, which is connected between the gas inlet side of the first compressor 200 and the gas outlet side of the second compressor 120, so that the gas compressed by the second compressor 120 can enter the first compressor 200 through the first connecting pipe section 130.

[0047] The gas supplement structure 100 further comprises a second connecting pipe section 140, one end of the second connecting pipe section 140 is communicated with the first connecting pipe section 130, and the other end of the second connecting pipe section 140 is communicated with the gas inlet 111, so that the gas compressed by the second compressor 120 can enter the second connecting pipe section 140 through the first connecting pipe section 130 and further enter the gas chamber 110 through the second connecting pipe section 140 for storage.

[0048] By connecting the second connecting pipe section 140 with the first connecting pipe section 130, the arrangement of the pipeline in the gas supplement structure 100 is reduced, thereby reducing the material cost of the gas supplement structure 100 and reducing the structural complexity of the gas supplement structure 100.

[0049] The air supplement structure 100 further comprises a third connecting pipe section 150, one end of the third connecting pipe section 150 is communicated with the air outlet 112, and the other end of the third connecting pipe section 150 is communicated with the air inlet side of the first compressor 200, when air supplement for the first compressor 200 is needed, the gas stored in the gas chamber 110 can enter the first compressor 200 through the air outlet 112 and the third connecting pipe section 150, so as to realize air supplement for the first compressor 200.

[0050] As shown in Figure 1 In some embodiments of the utility model, the air supplement structure 100 further comprises a first on-off valve 131, a second on-off valve 141 and a third on-off valve 151, the first on-off valve 131 is arranged in the first connecting pipe section 130 and is used for selectively communicating the air outlet side of the second compressor 120 with the air inlet side of the first compressor 200, the second on-off valve 141 is arranged in the second connecting pipe section 140 and is used for controlling the on-off state of the second connecting pipe section 140, and the third on-off valve 151 is arranged in the third connecting pipe section 150 and is used for controlling the on-off state of the third connecting pipe section 150.

[0051] Exemplarily, in the energy storage phase of the compressed air energy storage system, when new energy power is sufficient and the compressed air energy storage system is in a normal operation state, it can also be understood that the first on-off valve 131 is opened, the second on-off valve 141 and the third on-off valve 151 are closed, and the gas compressed by the second compressor 120 is all transported into the first compressor 200 at this time, and the first compressor 200 further compresses the gas.

[0052] When new energy power is small and insufficient to drive the first compressor 200 and the second compressor 120 to run simultaneously, at this time, the second compressor 120 is started, the first on-off valve 131 and the third on-off valve 151 are in a closed state, and the second on-off valve 141 is opened, the gas discharged by the second compressor 120 enters the second connecting pipe section 140 through the first connecting pipe section 130 and further enters the gas chamber 110, and the gas chamber 110 stores the gas.

[0053] When the first compressor 200 has a surge phenomenon, the first on-off valve 131 and the third on-off valve 151 are opened, and the second on-off valve 141 is closed, the second compressor 120 transports the gas to the first compressor 200, and at the same time, the gas chamber 110 transports the gas to the first compressor 200 through the third connecting pipe section 150, so as to supplement the air of the first compressor 200, thereby inhibiting the surge problem of the first compressor 200.

[0054] It should be noted that the gas stored in the gas chamber 110 is the gas compressed by the second compressor 120, that is, the gas stored in the gas chamber 110 is medium-pressure gas.

[0055] Referring toFigure 1 In some embodiments of the present application, the communication position of the second connecting pipe section 140 and the first connecting pipe section 130 is located upstream of the first on-off valve 131 in the first connecting pipe section 130, and it can also be understood that the connection position of the second connecting pipe section 140 and the first connecting pipe section 130 is located at the inlet side of the first on-off valve 131, so as to prevent the second connecting pipe section 140 from being cut off when the first on-off valve 131 is closed, and to ensure that the second compressor 120 can still deliver gas into the gas chamber 110 through the second connecting pipe section 140 when the first on-off valve 131 is in a closed state.

[0056] As shown in Figure 1 some embodiments of the present application, the gas chamber 110 comprises a main body 113 and a partition plate 114, the main body 113 has a cavity 1131, and the partition plate 114 is adjustably arranged in the cavity 1131 and is adapted to divide the cavity 1131 to form a first cavity 1131a which is in communication with the gas inlet 111 and the gas outlet 112.

[0057] The cavity 1131 is formed in the main body 113 to facilitate the installation of the partition plate 114 in the main body 113, and the cavity 1131 can contain gas so that the gas chamber 110 can store the gas discharged by the second compressor 120, wherein the partition plate 114 divides the cavity 1131 to form the first cavity 1131a, the first cavity 1131a is in communication with the gas inlet 111 and the gas outlet 112 respectively, the gas discharged by the second compressor 120 can enter the first cavity 1131a through the gas inlet 111, and the gas in the first cavity 1131a can be further discharged from the first cavity 1131a through the gas outlet 112.

[0058] Further, the position of the partition plate 114 in the first cavity 1131a can be adjusted to adjust the volume of the first cavity 1131a, for example, the gas inlet 111 and the gas outlet 112 can be arranged on the same side wall of the main body 113, and the partition plate 114 can be moved towards the side wall where the gas inlet 111 and the gas outlet 112 are arranged, so that the volume of the first cavity 1131a is reduced, thereby compressing the gas in the first cavity 1131a, which is conducive to ensuring that the gas supplied by the gas chamber 110 to the first compressor 200 can reach the gas flow required when the first compressor 200 surges, thereby ensuring the effect of suppressing the surge of the first compressor 200.

[0059] Referring to Figure 1 In some embodiments of the present application, the gas supplementing structure 100 further comprises a driving device 160 connected with the partition plate 114 and used to drive the partition plate 114 to move so as to adjust the volume of the first cavity 1131a.

[0060] Exemplarily, the driving device 160 can include a motor 161 and a screw rod 162, one end of the screw rod 162 can be connected with an output shaft of the motor 161, and the other end of the screw rod 162 can be connected with the partition plate 114. In the process of the air chamber 110 supplementing air to the first compressor 200, the motor 161 is started and drives the screw rod 162 to rotate, and the screw rod 162 rotates and moves in the axial direction at the same time, so as to drive the partition plate 114 to move in the axial direction. The air inlet 111 and the air outlet 112 are located on the side of the main body part 113 away from the motor 161 in the axial direction of the screw rod 162, so that the volume of the first cavity 1131a can be adjusted when the driving device 160 drives the partition plate 114 to move.

[0061] It can be understood that the structure of the driving device 160 described above is only one embodiment of the present application and cannot be understood as a limitation of the present application. The driving device 160 can also be formed into other structures, such as a hydraulic rod, etc. The driving device 160 can be arranged inside the cavity 1131 or outside the cavity 1131. The arrangement position and structure of the driving device 160 can be determined according to actual production requirements, which is not limited here.

[0062] Referring to Figure 1 In some embodiments of the present application, the partition plate 114 can also divide the cavity 1131 to form a second cavity 1131b, and the main body part 113 is provided with a pressure adjusting port 1132 in communication with the second cavity 1131b. The pressure adjusting port 1132 can be used to communicate the second cavity 1131b with the outside of the main body part 113.

[0063] Exemplarily, the second cavity 1131b is formed on the side of the cavity 1131 away from the first cavity 1131a, and the partition plate 114 separates the first cavity 1131a and the second cavity 1131b and makes the first cavity 1131a and the second cavity 1131b not communicate, so as to prevent the gas in the first cavity 1131a from entering the second cavity 1131b and causing the gas to be difficult to discharge, which is beneficial to improve the efficiency of discharging the gas from the air chamber 110.

[0064] Further, the pressure adjusting port 1132 can be arranged on the side wall surface of the main body part 113 opposite to the side wall on which the air inlet 111 and the air outlet 112 are arranged. The pressure adjusting port 1132 is used to communicate the second cavity 1131b with the outside (such as the atmosphere) of the main body part 113, so as to prevent the second cavity 1131b from generating negative pressure during the movement of the partition plate 114 in the cavity 1131, which is beneficial to reduce the resistance generated by the second cavity 1131b to the partition plate 114 and facilitate the movement of the partition plate 114 in the cavity 1131.

[0065] The compressed air energy storage system according to the present application comprises the air supplementing structure 100 described above.

[0066] Since the compressed air energy storage system is provided with the above-mentioned air supplementing structure 100, by connecting the second compressor 120 with the first compressor 200 and the air chamber 110 respectively, and the first compressor 200 can be connected with the air chamber 110, the second compressor 120 can directly deliver gas to the first compressor 200, the second compressor 120 can also deliver gas to the air chamber 110, and the air chamber 110 can store the gas delivered by the second compressor 120, so as to supplement the first compressor 200 when the first compressor 200 is in low load operation and the exhaust volume is insufficient, inhibit the surge problem of the first compressor 200, prevent the waste of gas due to the actual flow of the gas being too much compared with the flow required by the compressor in low load operation, and help to reduce the operation cost of the compressed air energy storage system.

[0067] In some embodiments of the utility model, the power of the first compressor 200 is greater than the power of the second compressor 120, so that the second compressor 120 can be normally started in the case that new energy power is small and insufficient to drive the first compressor 200 to operate, so that the second compressor 120 can deliver gas into the air chamber 110, and ensure that the air supplementing structure 100 can still operate when the new energy power is small.

[0068] The following refers to Figure 1 The compressed air energy storage system of the embodiments of the utility model is simply described in three working states during the energy storage stage.

[0069] (1) When the compressed air energy storage system is normally operated, the first compressor 200 and the second compressor 120 work simultaneously, at this time, the first on-off valve 131 is opened, the second on-off valve 141 and the third on-off valve 151 are closed, and the external gas is compressed by the second compressor 120 and then enters the first connecting pipe section 130, and when the second compressor 120 is provided with multiple, the gases discharged by multiple second compressors 120 can be converged and heat exchanged in the first connecting pipe section 130, and the heat exchanged gas further enters the first compressor 200 from the first connecting pipe section 130, and the first compressor 200 further compresses the gas.

[0070] (2) When the new energy provides power for the compression process of the compressed air energy storage system, and the new energy power cannot drive the first compressor 200 and the second compressor 120 to work simultaneously, and the new energy power only supports at least one of the plurality of second compressors 120 to work, at this time, the first on-off valve 131 and the third on-off valve 151 are closed, the second on-off valve 141 is opened, the compressed gas of the second compressor 120 flows through the first connecting pipe section 130 and exchanges heat in the first connecting pipe section 130, the gas after heat exchange enters the gas chamber 110 through the second connecting pipe section 140 and the gas inlet 111, and the gas chamber 110 stores the gas, at this time, the driving device 160 does not work, the partition plate 114 is in contact with the side wall surface of the gas chamber 110 away from the gas inlet 111 and the gas outlet 112, and the pressure regulating port 1132 is in a closed state.

[0071] (3) When the new energy power drives the first compressor 200 and the second compressor 120 to work simultaneously, and the first compressor 200 occurs surge, the first on-off valve 131, the third on-off valve 151 and the pressure regulating port 1132 are opened, the second on-off valve 141 is closed, the second compressor 120 delivers the gas to the first compressor 200 through the first connecting pipe section 130, and the gas chamber 110 delivers the gas stored therein to the first compressor 200 through the third connecting pipe section 150, at this time, the driving device 160 operates to drive the partition plate 114 to compress the first cavity 1131a, so as to accelerate the discharge of the gas stored in the first cavity 1131a, so that the flow of the gas discharged from the gas chamber 110 can meet the gas supplement demand of the first compressor 200, thereby inhibiting the surge of the first compressor 200, when the first compressor 200 is out of surge, the third on-off valve 151 is closed, the driving device 160 drives the partition plate 114 to move reversely to be in contact with the side wall surface of the gas chamber 110 away from the gas inlet 111 and the gas outlet 112, at this time, the volume of the first cavity 1131a is in a maximum state, facilitating the gas chamber 110 to store the gas next time, so that the gas supplement structure 100 prepares for the gas supplement to the first compressor 200 next time.

[0072] In the description of the present specification, the description of the terms "one embodiment", "some embodiments", "exemplary embodiment", "example", "specific example", or "some examples" means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present application. In the present specification, the exemplary description of the above terms does not necessarily mean the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in any one or more embodiments or examples in a suitable manner.

[0073] Although the embodiments of the utility model have been shown and described, those of ordinary skill in the art can understand that various changes, modifications, replacements and variations can be made to these embodiments without departing from the principles and purposes of the utility model, and the scope of the utility model is defined by the claims and their equivalents.

Claims

1. An air supplementing structure, characterized in that, The air supplementing structure is applied to a compressed air energy storage system and is used for delivering air to a first compressor (200) in the compressed air energy storage system, and the air supplementing structure comprises: an air chamber (110) having an air inlet (111) and an air outlet (112), wherein the air outlet (112) is selectively communicated with the first compressor (200) and is used for delivering air to the first compressor (200); at least one second compressor (120) which is used for delivering air into the air chamber (110) through the air inlet (111) and is also used for directly delivering air to the first compressor (200).

2. The air supplementing structure according to claim 1, wherein The second compressor (120) is multiple, and the multiple second compressors (120) are arranged in parallel with each other.

3. The air supplementing structure according to claim 1, wherein The air supplementing structure further comprises: a first connecting pipe section (130) which is connected between an air inlet side of the first compressor (200) and an air outlet side of the second compressor (120); a second connecting pipe section (140) which is communicated with the first connecting pipe section (130) at one end and is communicated with the air inlet (111) at the other end; a third connecting pipe section (150) which is communicated with the air outlet (112) at one end and is communicated with the air inlet side of the first compressor (200) at the other end.

4. The air supplementing structure according to claim 3, wherein The air supplementing structure further comprises: a first on-off valve (131) which is arranged in the first connecting pipe section (130) and is used for selectively connecting the air outlet side of the second compressor (120) with the air inlet side of the first compressor (200); a second on-off valve (141) which is arranged in the second connecting pipe section (140) and is used for controlling a connection state of the second connecting pipe section (140); a third on-off valve (151) which is arranged in the third connecting pipe section (150) and is used for controlling a connection state of the third connecting pipe section (150).

5. The air supplementing structure according to claim 4, wherein The second connecting pipe section (140) is communicated with the first connecting pipe section (130) at a position upstream of the first on-off valve (131) in the first connecting pipe section (130).

6. The air supplementing structure according to claim 1, wherein The air chamber (110) comprises: a main body (113) having a cavity (1131); a partition plate (114) which is arranged in the cavity (1131) in a position-adjustable manner and is adapted to divide the cavity (1131) to form a first cavity (1131a) communicated with the air inlet (111) and the air outlet (112).

7. The air supplementing structure according to claim 6, wherein The air supplementing structure further comprises a driving device (160) which is connected with the partition plate (114) and is used for driving the partition plate (114) to move so as to adjust a volume of the first cavity (1131a).

8. The air supplementing structure according to claim 6, wherein The partition plate (114) can also divide the cavity (1131) to form a second cavity (1131b), and the main body part (113) is provided with a pressure regulating port (1132) in communication with the second cavity (1131b), which is used for communicating the second cavity (1131b) with the outside of the main body part (113).

9. A compressed air energy storage system characterized in that, The air supplementing structure according to any one of claims 1-8.

10. The compressed air energy storage system of claim 9, wherein, The power of the first compressor (200) is greater than the power of the second compressor (120).

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