Compressed air energy storage system with water removal function and operation method thereof

Abstract

The invention relates to the technical field of energy storage, in particular to a compressed air energy storage system with a water removal function and an operation method of the compressed air energy storage system. The compressed air energy storage system comprises a gas compression device, a gas storage, a gas expansion device and a water removal device. Wherein an exhaust port of the gas compression device is connected with a gas inlet of the gas storage; an exhaust port of the gas storage is connected with a gas inlet of the gas expansion device; and the water removal device is arranged between an air inlet through which external air enters the compressed air energy storage system and an air inlet of the air expansion device. According to the compressed air energy storage system, the water removal device is used for forming dry compressed air, and the dry compressed air fully absorbs water in the gas storage after entering the gas storage. And when the compressed gas is discharged from the gas storage, the water in the gas storage can be discharged together. The energy consumption required by the water removal process is low, the operation difficulty is low, and a guarantee can be provided for stable and efficient operation of the whole compressed air energy storage system.

Description

Technical Field

[0001] The present invention relates to the field of energy storage technology, and in particular to a compressed air energy storage system with a water removal function and an operating method thereof. Background Art

[0002] The basic principle of compressed air energy storage (CAES) is this: when excess electricity is generated at the power generation end, a compressor compresses air to a high pressure and stores it in a gas storage reservoir. When the power grid needs electricity, the high-pressure air in the gas storage reservoir is used to generate power in a turbine, which is then supplied to the grid. A gas storage reservoir is a key device for storing high-pressure air in a CAES system. It primarily consists of abandoned salt caverns and artificial chambers. Salt caverns are created by dissolving mineral salts in water to create a cavity, which is then expelled through gas compression. Because direct discharge of brine from the gas storage reservoir would cause pollution, it still requires evaporation and concentration before drainage, a process that consumes significant energy. During the construction of artificial chambers, residual moisture is unavoidable. Consequently, a significant amount of moisture is often present in the gas storage reservoir.

[0003] When the compressed air energy storage system is discharged, that is, when the gas storage reservoir is deflated, the water vapor in the gas storage reservoir will enter the expander along with the compressed air. During the turbine process, it may cool and condense into liquid water, causing corrosion to the pipeline equipment or expansion equipment when in contact with the metal surface, affecting the equipment's operational safety and lifespan. In addition to the problem of liquefaction corrosion, water vapor may also condense into ice crystals, causing blockage problems in pipes, valves, filters and other components, resulting in reduced system efficiency or failure. Therefore, if you want to maintain the smooth and efficient operation of the compressed air energy storage system, you also need to dehydrate the gas storage reservoir so that the moisture content of the gas storage reservoir is lower than the target content.

[0004] However, since gas storage facilities are generally located deep underground, direct drainage operations using water pumps are difficult, energy-intensive, and unable to remove water vapor in the form of water vapor. Summary of the Invention

[0005] In response to the above problems, the present invention provides a compressed air energy storage system with a dehydration function and an operating method thereof, which can conveniently and effectively remove water in the gas storage reservoir, including water vapor, and the energy consumption required for the dehydration process is low.

[0006] In a first aspect, the present invention provides a compressed air energy storage system with a dehydration function, comprising a gas compression device, a gas storage reservoir, a gas expansion device, and a dehydration device. The exhaust port of the gas compression device is connected to the air inlet of the gas storage reservoir; the exhaust port of the gas storage reservoir is connected to the air inlet of the gas expansion device; and the dehydration device is disposed between the air inlet through which external gas enters the compressed air energy storage system and the air inlet of the gas expansion device.

[0007] Optionally, the gas compression device includes one or more compressors connected in series; the gas expansion device includes one or more turbines connected in series.

[0008] Optionally, the compressed air energy storage system further includes a heat exchange device, which is arranged between the exhaust port of the gas compression device and the air inlet of the gas storage reservoir, and between the exhaust port of the gas storage reservoir and the air inlet of the gas expansion device.

[0009] Optionally, the heat exchange device includes one or more first heat exchange units and one or more second heat exchange units, wherein the first heat exchange unit is arranged between the compressor and the gas storage reservoir and / or between multiple compressors; and the second heat exchange unit is arranged between the gas storage reservoir and the turbine and / or between multiple turbines.

[0010] Optionally, the heat exchange device further includes a heat storage tank and a cold storage tank, wherein the heat storage tank is connected to the first heat exchange unit; and the cold storage tank is connected to the second heat exchange unit.

[0011] Optionally, the water removal device includes one or more gas-liquid separators; the gas-liquid separator is arranged between the first heat exchange unit and the gas storage reservoir and / or between the first heat exchange unit and the compressor; and / or, the gas-liquid separator is arranged between the second heat exchange unit and the gas storage reservoir and / or between the second heat exchange unit and the turbine.

[0012] Optionally, the gas compression device, the heat exchange device, the water removal device, and the gas expansion device operate synchronously, and at least part of the energy generated by the operation of the gas expansion device is used to drive the gas compression device to compress the gas.

[0013] A second aspect of the present invention provides an operating method, which is applied to the above-mentioned compressed air energy storage system with water removal function, and the operating method comprises the following steps:

[0014] Gas compression step: compressing the external gas entering the gas compression device;

[0015] Gas storage step: storing the compressed gas entering the gas storage from the gas compression device;

[0016] Gas expansion step: expanding and performing work on the compressed gas entering the gas expansion device from the gas storage;

[0017] Dehydration step: The dry compressed gas generated by the dehydration device absorbs the moisture in the gas storage reservoir and is discharged from the gas storage reservoir along with the compressed gas.

[0018] Optionally, the gas expansion step recovers electrical energy consumed by the gas compression step.

[0019] Optionally, the operating method further includes:

[0020] Heat exchange steps:

[0021] It is used to perform heat exchange and cooling on the compressed gas generated by the gas compression step; and to perform heat exchange and heating on the compressed gas before entering the gas expansion step.

[0022] The compressed air energy storage system with a dehydration function provided by the present invention can effectively remove external gas and water in the gas storage reservoir, including water in the form of water vapor, by providing a dehydration device between the air inlet where the external gas enters the compressed air energy storage system and the air inlet of the gas expansion device. This effectively reduces the risk that the pipeline equipment and operating equipment in the compressed air energy storage system will come into contact with water, resulting in corrosion or ice blockage, which will negatively impact the overall service life and operational safety of the compressed air energy storage system. At the same time, the compressed air energy storage system can remove water vapor in the gas storage reservoir with lower energy consumption, improve the operating efficiency of the gas storage reservoir, and reduce the overall operating cost of the compressed air energy storage system to a certain extent. BRIEF DESCRIPTION OF THE DRAWINGS

[0023] Figure 1 It is a schematic diagram of an operating module of a compressed air energy storage system with a water removal function provided in the first embodiment of the present invention.

[0024] Figure 2 It is a structural schematic diagram of a compressed air energy storage system with a water removal function provided in the first embodiment of the present invention.

[0025] Figure 3 It is a schematic diagram of an operating module of a compressed air energy storage system with a water removal function provided in the second embodiment of the present invention.

[0026] Figure 4 It is a schematic diagram of the operating module of another compressed air energy storage system with water removal function provided in the second embodiment of the present invention.

[0027] Figure numerals: 100-compressed air energy storage system, 1-gas compression device, 11-compressor, 2-gas expansion device, 21-turbine, 3-gas storage, 4-heat exchange device, 41A-first heat exchange unit, 41B-second heat exchange unit, 42-heat storage tank, 43-cold storage tank, 5-water removal device, 51-gas-liquid separator. DETAILED DESCRIPTION

[0028] The following will clearly and completely describe the technical solutions in the embodiments of the present invention in conjunction with the accompanying drawings. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without making creative efforts are within the scope of protection of the present invention.

[0029] <First embodiment>

[0030] Figure 1 Schematic diagram of the operation module of a compressed air energy storage system 100 with water removal function provided in this embodiment. Figure 1 The compressed air energy storage system 100 provided in this embodiment includes a gas compression device 1, a gas storage reservoir 3, a gas expansion device 2, and a water removal device 5. The exhaust port of the gas compression device 1 is connected to the air inlet of the gas storage reservoir 3; the exhaust port of the gas storage reservoir 3 is connected to the air inlet of the gas expansion device 2; and the water removal device 5 is disposed between the air inlet of the compressed air energy storage system 100, through which external gas enters, and the air inlet of the gas expansion device 2.

[0031] As an important device for storing high-pressure gas in the compressed air energy storage system 100, the main construction sources of the gas storage reservoir 3 include the renovation of abandoned salt caverns and artificial caverns. During the salt cavern renovation and the construction of the artificial cavern, some liquid water and / or gaseous water will inevitably remain in the final gas storage reservoir 3. In addition, during the operation of the compressed air energy storage system 100, the water vapor contained in the external gas will continue to enter the gas storage reservoir 3 along with the compressed gas. As the compressed gas circulates, when the water in the gas storage reservoir 3 enters the operating equipment of the compressed air energy storage system 100, there may be a risk of corrosion damage or ice blockage of the pipeline and equipment. In response to the above problems, the compressed air energy storage system 100 provided in this embodiment is provided with a dehydration device 5, so that the water vapor in the gas before entering the gas storage reservoir 3 from the outside can be effectively removed, thereby forming dry gas. The dry gas is then used to absorb the original moisture in the gas storage reservoir 3. When the gas storage reservoir 3 needs to discharge the gas, the moisture removal work in the gas storage reservoir 3 can be completed at the same time. This embodiment efficiently and conveniently removes moisture from gas storage reservoir 3, further increasing its storage capacity for compressed gas and thereby improving the overall operating efficiency of compressed air energy storage system 100. Furthermore, the provision of water removal device 5 reduces the risk of corrosion or ice blockage in system operating piping and equipment caused by excessive moisture ingress, thereby reducing the probability of operational failures in compressed air energy storage system 100.

[0032] In this embodiment, the compressed air energy storage system 100 further includes a heat exchanger 4, which is disposed between the exhaust port of the gas compression device 1 and the air inlet of the gas storage reservoir 3, and between the exhaust port of the gas storage reservoir 3 and the air inlet of the gas expansion device 2. The heat exchanger 4 cools and heats the compressed gas before entering and exiting the gas storage reservoir 3, further increasing the storage capacity of the gas storage reservoir 3 for compressed gas and improving the ability of the compressed gas to expand and work upon entering the gas expansion device 2, thereby effectively recovering the heat of compression of the gas in the compressed air energy storage system 100.

[0033] refer to Figure 1 The operation process of the compressed air energy storage system 100 of this embodiment is as follows: When the gas storage reservoir 3 is in the inflation state, the external raw gas is first introduced into the gas compression device 1, and the surplus electric energy generated by the outside world drives the gas compression device 1 to perform a gas pressure-boosting operation. During the gas pressure-boosting process, the surplus electric energy is converted into the internal energy of the gas, which includes pressure energy and thermal energy. After the compressed gas is heated and pressurized by the gas compression device 1, it first enters the heat exchange device 4 for cooling, thereby further increasing the density of the compressed gas. Figure 1 In this embodiment, the dehumidifier 5 is positioned between the exhaust port of the heat exchanger 4 (used for cooling) and the air inlet of the gas storage reservoir 3. After cooling in the heat exchanger 4, the compressed gas continues to flow through the dehumidifier 5, where it removes moisture from the compressed gas. Subsequently, the relatively dry compressed gas discharged from the dehumidifier 5 continues to flow through the gas pipeline into the gas storage reservoir 3 for standby use. During the initial operation of the compressed air energy storage system 100, the gas storage reservoir 3 may contain a certain amount of moisture. Therefore, upon entering the gas storage reservoir 3, the dry compressed gas absorbs the moisture within, becoming humidified compressed gas. When the gas storage 3 is deflated, the humidified compressed gas is discharged from the exhaust port of the gas storage 3 and re-enters the heat exchanger 4 for heating. The heated compressed gas then enters the gas expansion device 2. Through the process of cooling and reducing the pressure of the compressed gas, the pressure and thermal energy are fully converted into electrical energy for peak load shaving by external equipment. At the same time, as the compressed gas cools down and the pressure drops, the water vapor discharged from the gas storage 3 is removed after cooling in the gas expansion device 2, and the expanded gas is discharged to the outside through the exhaust port of the gas expansion device 2.

[0034] At this point, the compressed air energy storage system 100 not only utilizes the compression and expansion of gas to achieve peak-shaving use of electric energy in the power system; it also utilizes the water removal device 5 and the gas expansion device 2. On the one hand, it largely avoids the entry of moisture in the external gas into the gas storage reservoir 3; on the other hand, the original liquid water and / or gaseous water in the gas storage reservoir 3 can be effectively discharged, further enhancing the efficiency of the gas storage reservoir 3 during operation, and reducing the probability of failure of the compressed air energy storage system 100 caused by excessive moisture entering the system equipment.

[0035] In this embodiment, the gas compression device 1 is provided with a compressor 11, which uses external electrical energy to drive the compressor 11 to compress the atmospheric pressure gas entering the compressed air energy storage system 100 into high-pressure gas. The gas expansion device 2 is provided with a turbine 21. By transferring the compressed gas from the gas storage reservoir 3 to the turbine 21, the internal energy of the compressed gas is converted into mechanical energy by utilizing the gas expansion work, and ultimately energy is supplied to the outside world in the form of electrical energy. Depending on the specific energy storage and energy supply goals of the compressed air energy storage system 100, the gas compression device 1 may be provided with one compressor 11 or multiple compressors 11 connected in series, and the gas expansion device 2 may be provided with one or more turbines 21 connected in series, without specific limitations herein.

[0036] Figure 2 Schematic diagram of the structure of the compressed air energy storage system 100 provided in this embodiment. Figure 2 The gas compression device 1 includes a plurality of compressors 11 connected in series, and the gas expansion device 2 includes a plurality of turbines 21 connected in series. In order to enable the heat exchange device 4 to fully cool down and heat up the gas after compression and before expansion, in this embodiment, the heat exchange device 4 includes a plurality of first heat exchange units 41A and a plurality of second heat exchange units 41B. Figure 2 , multiple first heat exchange units 41A are respectively arranged between the compressor 11 and the gas storage reservoir 3, and between different compressors 11; multiple second heat exchange units 41B are respectively arranged between the gas storage reservoir 3 and the turbine 21, and between different turbines 21. In this embodiment, the water removal device 5 includes multiple gas-liquid separators 51, Figure 2 , multiple gas-liquid separators 51 are respectively arranged between the first heat exchange unit 41A and the compressor 11, and between the first heat exchange unit 41A and the gas storage reservoir 3.

[0037] In other embodiments, when the gas compression device 1 has only one compressor 11 and the gas expansion device 2 has only one turbine 21, the first heat exchange unit 41A is arranged between the compressor 11 and the gas storage reservoir 3, the second heat exchange unit 41B is arranged between the gas storage reservoir 3 and the turbine 21, and the gas-liquid separator 51 is arranged between the first heat exchange unit 41A and the gas storage reservoir 3.

[0038] In order to make full use of the heat and cold energy generated by the gas in the compressed air energy storage system 100, the heat exchange device 4 further includes a heat storage tank 42 and a cold storage tank 43. Figure 2The heat storage tank 42 is connected to the first heat exchange unit 41A; the cold storage tank 43 is connected to the second heat exchange unit 41B. When the compressor 11 and turbine 21 of the compressed air energy storage system 100 are operating simultaneously, the atmospheric pressure gas introduced from the outside is initially compressed by the first-stage compressor 11, causing both the pressure and temperature of the gas to increase. Subsequently, the heat energy in the compressed gas is collected by the first heat exchange unit 41A and transferred to the heat storage tank 42. The cooled compressed gas is then dehumidified by the gas-liquid separator 51 to remove moisture. After dehydration, the compressed gas enters the next-stage compressor 11, the second heat exchange unit 41B, and the gas-liquid separator 51, continuing the gas compression, cooling, and dehydration process step by step. After the multi-stage cycle of the above process, the resulting dry, high-density compressed gas is passed into the gas storage reservoir 3 for storage. Within the gas storage reservoir 3, the dry compressed gas fully absorbs moisture within the gas storage reservoir 3 to form humidified compressed gas. When the compressed air energy storage system 100 needs to supply energy to the outside world, the humid compressed gas is discharged from the air outlet of the gas storage reservoir 3 and first enters the first-stage second heat exchange unit 41B. The heat energy collected by the heat storage tank 42 is used to increase the temperature of the compressed gas, and the cold energy of the compressed gas is collected in the cold storage tank 43. The cold energy collected in the cold storage tank 43 can be reused to cool the compressed gas discharged from the compressor 11.

[0039] After being heated by the second heat exchange unit 41B, the moist compressed gas enters the first-stage turbine 21 for initial expansion and work. To ensure that the compressed gas can fully utilize the heat energy collected by the heat storage tank 42 and subsequently expand and produce work, the compressed gas after initial expansion enters the next-stage second heat exchange unit 41B and turbine 21, undergoing step-by-step heating and expansion. Once the compressed gas has completely supplied energy, it is ultimately discharged to the outside through the exhaust port of the final-stage turbine 21.

[0040] In this embodiment, when the compressed air energy storage system 100 is in full operation, the gas compression device 1, the heat exchange device 4, the water removal device 5, and the gas expansion device 2 operate synchronously, which can match the operating parameters of the different devices and further improve the flow continuity of the gas in the compressed air energy storage system 100, thereby avoiding additional energy consumption due to fluctuations in operating conditions. In addition, at least part of the energy generated by the operation of the gas expansion device 2 is used to drive the gas compression device 1 to compress the gas. The above design can reduce the dependence and consumption of the gas compression device 1 on external energy and further improve the overall energy utilization efficiency of the compressed air energy storage system 100.

[0041] As the humid compressed gas discharged from the gas storage reservoir 3 experiences a decrease in pressure and temperature during the expansion process, the moisture in the gas begins to condense and is discharged outward through a drain port provided in the gas expansion device 2. Through the above expansion, cooling and water removal process, when the gas compression device 1 and the gas expansion device 2 are operated simultaneously, the gas expansion device 2 can not only recover part of the electrical energy consumed by the gas compression device 1, but can also remove moisture from the gas storage reservoir 3 with lower energy consumption, thereby improving the overall operating efficiency of the gas storage reservoir 3 and the compressed air energy storage system 100.

[0042] This embodiment also provides an operating method, which is applied to the compressed air energy storage system 100 and includes the following execution steps: a gas compression step, a gas storage step, a gas expansion step, and a water removal step.

[0043] The following describes the execution steps in this operation method.

[0044] <Gas Compression Step>

[0045] After the raw gas from the outside enters the gas compression device 1, it is compressed by the compressor 11 inside the gas compression device 1. The electricity that drives the compressor 11 is provided by the excess electricity generated by the power system. Through the gas compression step, the excess electricity is converted into the pressure energy and heat energy of the compressed gas.

[0046] <Gas Storage Step>

[0047] After the gas compression step is completed, the compressed gas is discharged from the gas compression device 1 and then passed into the gas storage reservoir 3 for storage and standby. To ensure that the compressed gas can be more completely transferred from the gas compression device 1 to the gas storage reservoir 3, the excess electricity generated by the power system can be used to extract the compressed gas from the gas compression device 1.

[0048] <Gas Expansion Step>

[0049] When the power system needs to shave peak loads and the energy stored in the compressed air energy storage system 100 is used to supply power, the compressed gas is discharged from the gas storage reservoir 3 and then enters the gas expansion device 2 to expand and produce work. In this embodiment, the gas expansion device 2 is equipped with a turbine 21. The compressed gas entering the gas expansion device 2 expands and drives the turbine 21 to generate electricity, thereby achieving peak load regulation.

[0050] <Water removal step>

[0051] During the construction process of the compressed air energy storage system 100, the gas storage reservoir 3 may contain a certain amount of liquid water or gaseous water, or it may be affected by the environment. In order to prevent the water vapor in the gas storage reservoir 3 from entering the pipeline or operating equipment along with the compressed air during the operation of the compressed air energy storage system 100, affecting the overall operational safety and life of the equipment and system, this embodiment removes the moisture in the gas storage reservoir 3 through a dehydration step. Specifically, after the compressed gas has completed the gas compression step, it is formed into a dry compressed gas after the dehydration step. Subsequently, when the dry compressed gas is subjected to the gas storage step, it fully absorbs the moisture in the gas storage reservoir 3 and is formed into a humid compressed gas. Finally, when the compressed gas leaves the gas storage reservoir 3 to perform the gas expansion step, the moisture in the gas storage reservoir 3 is taken out together, thereby maintaining the smooth, efficient and continuous operation of the compressed air energy storage system 100 to a certain extent.

[0052] For another compressed air energy storage system 100 provided in this embodiment, its operating method also includes a heat exchange step.

[0053] <Heat exchange step>

[0054] On the one hand, as the gas is compressed in the gas compression step, a portion of the electrical energy is converted into heat from the compressed flue gas. Through the heat exchange step, the compressed gas can be cooled by heat exchange, increasing its density and thereby increasing the energy storage capacity of the compressed air energy storage system 100.

[0055] Furthermore, the heat of the compressed gas can be collected and stored in heat storage tank 42 through the heat exchange step, and then used to heat the compressed gas before the gas expansion step, thereby increasing the expansion capacity of the heated compressed gas. Simultaneously, the cold energy of the compressed gas is also collected in cold storage tank 43 and reused to cool the compressed gas after the gas compression step. Through the heat exchange step, this embodiment fully and effectively recovers the heat of compression generated during the operation of the compressed air energy storage system 100.

[0056] <Second embodiment>

[0057] Figure 3 Schematic diagram of the operation module of a compressed air energy storage system 100 provided in this embodiment. Figure 3 As shown, in this embodiment, a dehydration device 5 is further provided between the air outlet of the gas storage reservoir 3 and the air inlet of the heat exchange device 4, which is used to remove moisture brought out of the compressed gas from the gas storage reservoir 3, so as to avoid as much as possible the corrosion damage caused by the contact between the heat exchange device 4 and the gas expansion device 2 and water, as well as the risk of pipeline blockage caused by freezing of moisture after cooling in the gas expansion device 2.

[0058] refer to Figure 4In other embodiments, the dehydration device 5 can also be arranged before the air inlet of the gas compression device 1 to remove water vapor contained in the original gas, thereby preventing the gas compression device 1 and the heat exchange device 4 from contacting and corroding with water vapor during the long-term operation of the compressed air energy storage system 100.

[0059] The above are only preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent substitutions and improvements made within the spirit and principles of the present invention should be included in the scope of protection of the present invention.

Claims

1. A compressed air energy storage system with water removal function, characterized in that: include: Gas compression devices, A gas storage reservoir, wherein the exhaust port of the gas compression device is connected to the gas inlet of the gas storage reservoir; A gas expansion device, wherein the exhaust port of the gas storage reservoir is connected to the air inlet of the gas expansion device; The water removal device is arranged between the air inlet through which external gas enters the compressed air energy storage system and the air inlet of the gas expansion device.

2. The compressed air energy storage system with water removal function according to claim 1, characterized in that: The gas compression device includes one or more compressors connected in series; the gas expansion device includes one or more turbines connected in series.

3. The compressed air energy storage system with water removal function according to claim 2, characterized in that: Also includes: The heat exchange device is arranged between the exhaust port of the gas compression device and the air inlet of the gas storage reservoir, and between the exhaust port of the gas storage reservoir and the air inlet of the gas expansion device.

4. The compressed air energy storage system with water removal function according to claim 3, characterized in that: The heat exchange device comprises: one or more first heat exchange units, wherein the first heat exchange units are arranged between the compressor and the gas storage and / or between the multiple compressors; One or more second heat exchange units, wherein the second heat exchange unit is arranged between the gas storage and the turbine and / or between the multiple turbines.

5. The compressed air energy storage system with water removal function according to claim 4, characterized in that: The heat exchange device further comprises: a heat storage tank connected to the first heat exchange unit; The cold storage tank is connected to the second heat exchange unit.

6. The compressed air energy storage system with water removal function according to claim 4, characterized in that: The water removal device includes one or more gas-liquid separators; The gas-liquid separator is provided between the first heat exchange unit and the gas storage reservoir and / or between the first heat exchange unit and the compressor; and / or, The gas-liquid separator is arranged between the second heat exchange unit and the gas storage reservoir and / or between the second heat exchange unit and the turbine.

7. The compressed air energy storage system with water removal function according to claim 3, characterized in that: The gas compression device, the heat exchange device, the water removal device, and the gas expansion device operate synchronously, and at least part of the energy generated by the operation of the gas expansion device is used to drive the gas compression device to compress gas.

8. An operating method of a compressed air energy storage system with a water removal function according to any one of claims 1 to 7, characterized in that: The following steps are involved: Gas compression step: compressing the external gas entering the gas compression device; Gas storage step: storing the compressed gas entering the gas storage from the gas compression device; Gas expansion step: expanding and performing work on the compressed gas entering the gas expansion device from the gas storage; Dehydration step: using the dry compressed gas formed by the dehydration device to absorb the moisture in the gas storage reservoir and discharge it from the gas storage reservoir along with the compressed gas.

9. The operating method according to claim 8, characterized in that: The gas expansion step recovers the electrical energy consumed by the gas compression step.

10. The operating method according to claim 8, characterized in that: Also includes: Heat exchange steps: Performing heat exchange and cooling on the compressed gas generated in the gas compression step; and The compressed gas is heated by heat exchange before entering the gas expansion step.

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