Steam constant-pressure compressed air energy storage system and energy storage method

Abstract

The invention relates to the field of energy storage systems, and discloses a steam constant-pressure compressed air energy storage system and an energy storage method.The steam constant-pressure compressed air energy storage system comprises an air compression unit, a liquid storage device, a water-gas co-container, a water storage unit, a turbine unit and a spraying device; the air compression unit compresses air, performs gas-liquid separation on the air and is provided with a gas outlet and a liquid outlet, the liquid storage device is communicated with the liquid outlet and is used for storing liquid, and the water-gas co-container is internally provided with a gas storage chamber communicated with the gas outlet and a liquid storage chamber communicated with the water storage unit; the water storage unit receives liquid in the liquid storage chamber and conveys the liquid to the liquid storage chamber, the gas storage chamber communicates with the turbine unit and conveys gas to the turbine unit, and the spraying device is arranged in the gas storage chamber, communicates with the liquid storage device and is used for spraying steam to the gas storage chamber so that the pressure in the gas storage chamber can be constant. According to the steam constant-pressure compressed air energy storage system provided by the embodiment of the invention, the energy storage efficiency and the working stability of the steam constant-pressure compressed air energy storage system can be improved.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to a steam constant-pressure compressed air energy storage system and an energy storage method. Background Art

[0002] The global energy structure is transforming from traditional fossil energy to clean energy, which requires large-scale, long-cycle, cost-effective and efficient energy storage technology to support it.

[0003] Among them, the compressed air energy storage system is considered to be a technology suitable for large-scale power storage after pumped storage, and it plays an important role in energy transformation.

[0004] At present, existing compressed air energy storage systems are often unable to maintain constant pressure in the air storage chamber, causing the turbine inlet pressure to constantly change, making the turbine work under non-rated conditions for a long time, resulting in limited efficiency and stability of the energy storage system. At the same time, it will also lead to insufficient energy utilization of the energy storage system itself, resulting in a large amount of energy waste. Summary of the Invention

[0005] The present invention aims to solve at least one of the technical problems existing in the prior art. To this end, the present invention proposes a steam constant-pressure compressed air energy storage system. The steam constant-pressure compressed air energy storage system can maintain a constant pressure in the air storage chamber and a constant pressure at the inlet of the turbine unit, allowing the turbine unit to operate at rated operating conditions for a long time. This not only improves the operating efficiency and stability of the steam constant-pressure compressed air energy storage system, but also improves the energy utilization rate of the system, solving the technical problems of the prior art in which the efficiency and stability of the energy storage system are limited and the energy utilization rate of the energy storage system itself is insufficient.

[0006] The present invention also aims to provide an energy storage method having the above-mentioned steam constant-pressure compressed air energy storage system.

[0007] According to an embodiment of the present invention, a steam constant-pressure compressed air energy storage system includes: an air compression unit, which is used to compress air and perform gas-liquid separation on the air, and the air compression unit has a gas outlet and a liquid outlet; a liquid reservoir, which is connected to the liquid outlet and is used to store liquid; a water-gas co-container and a water storage unit, which has an air storage chamber and a liquid storage chamber, the air storage chamber is connected to the gas outlet, the liquid storage chamber and the water storage unit are connected to each other, and the water storage unit is used to receive liquid in the liquid storage chamber and to transport liquid toward the liquid storage chamber; a turbine unit, which is connected to the air storage chamber, and the air storage chamber is used to transport gas toward the turbine unit; a spray device, which is connected to the liquid reservoir, and is used to spray steam toward the air storage chamber. By increasing the air storage temperature of the air storage chamber, the air storage pressure drop of the air storage chamber caused by degassing can be offset, so that the pressure in the air storage chamber is constant.

[0008] According to the steam constant-pressure compressed air energy storage system of the embodiment of the present invention, a spray device is provided, and steam is sprayed toward the air storage chamber by the spray device. The steam can fully contact with the compressed air through the spray device for heat exchange, so that the air storage temperature of the air storage chamber can be increased to offset the drop in air storage pressure in the air storage chamber caused by degassing, so that the pressure in the air storage chamber is constant. Since the air storage chamber is used to transport gas to the turbine unit, the pressure change at the inlet of the turbine unit can be reduced, which is beneficial to improving the working efficiency and working stability of the steam constant-pressure compressed air energy storage system, thereby ensuring the working performance of the steam constant-pressure compressed air energy storage system; at the same time, since the spray device is connected to the liquid reservoir, and the liquid reservoir is connected to the liquid outlet of the air compression unit, the steam constant-pressure compressed air energy storage system of the present invention can improve its own energy utilization rate (using the liquid of the air compression unit to spray steam toward the air storage chamber), without relying on an external heat source, and effectively improve the energy utilization rate.

[0009] In some embodiments, the spray device includes a steam generator and a nozzle, the steam generator is connected to the liquid reservoir and the nozzle respectively, and the nozzle is arranged in the air storage chamber; the nozzle is arranged near the top wall of the air storage chamber and fixedly connected to the top wall.

[0010] In some embodiments, the steam constant-pressure compressed air energy storage system further includes a circulation pump, which is connected between the liquid reservoir and the steam generator and is used to control the flow of liquid delivered to the steam generator.

[0011] In some embodiments, a water-gas co-container is provided with a water-permeable member that can move up and down, the upper side of the water-permeable member forms the air storage chamber, and the lower side of the water-permeable member forms the liquid storage chamber. The liquid in the air storage chamber can flow to the liquid storage chamber through the water-permeable member, and the water-permeable member moves up and down following the change of the liquid level in the liquid storage chamber.

[0012] In some embodiments, the water storage unit is installed at a higher height than the water-gas co-container.

[0013] In some embodiments, the air compression unit includes multiple stages, and each stage of the air compression unit includes a compressor, a heat exchanger, a cooler and a gas-liquid separator connected in series in sequence, and the gas-liquid separator has the gas outlet and the liquid outlet; the multiple stages of the air compression units are arranged in sequence in the direction of air flow, and in the two adjacent stages of the air compression units, the compressor of the air compression unit located downstream is connected to the gas outlet of the air compression unit located upstream, the water-gas co-container is connected to the gas outlet of the air compression unit of the last stage, and the liquid reservoir is respectively connected to the liquid outlets of the multiple stages of the air compression units.

[0014] In some embodiments, the steam constant-pressure compressed air energy storage system further includes a cooling tower, which is connected to the cooler and is used to absorb heat discharged from the air in the cooler.

[0015] In some embodiments, the turbine unit includes a plurality of turbines connected in series.

[0016] In some embodiments, a heater is connected upstream of each of the turbines; the steam constant-pressure compressed air energy storage system also includes a high-temperature tank and a low-temperature tank, the heater is connected in series with the heat exchanger, the high-temperature tank is arranged upstream of the heater and is respectively connected to the heater and the heat exchanger, and the low-temperature tank is arranged downstream of the heater and is respectively connected to the heater and the heat exchanger.

[0017] According to the energy storage method of an embodiment of the present invention, the energy storage method is applied to the aforementioned steam constant-pressure compressed air energy storage system, including: in the energy storage working stage, the liquid output by the air compression unit flows to the liquid reservoir, and the gas output by the air compression unit flows to the air storage chamber of the water-gas co-container, and the liquid in the liquid storage chamber of the water-gas co-container can flow to the water storage unit to store air energy; in the energy release working stage, the liquid in the water storage unit flows to the liquid storage chamber, and the air stored in the air storage chamber is input to the turbine unit. At the same time, the liquid stored in the liquid reservoir can be sprayed into the air storage chamber through a spray device, releasing latent heat to keep the air pressure in the air storage chamber constant, so as to perform work output.

[0018] The energy storage method according to an embodiment of the present invention is applied to the aforementioned steam constant-pressure compressed air energy storage system, which can improve the stability and reliability of the operation of the steam constant-pressure compressed air energy storage system to a certain extent, thereby improving the working performance of the steam constant-pressure compressed air energy storage system.

[0019] Additional aspects and advantages of the invention will become apparent from the description which follows, or may be learned by practice of the invention. BRIEF DESCRIPTION OF THE DRAWINGS

[0020] The above and / or additional aspects and advantages of the present invention will become apparent and readily understood from the following description of the embodiments with reference to the accompanying drawings, in which:

[0021] Figure 1 Schematic diagram of a steam constant-pressure compressed air energy storage system according to some embodiments of the present invention.

[0022] Reference numerals:

[0023] 1000. Steam constant pressure compressed air energy storage system;

[0024] 100. Air compression unit;

[0025] 110. Gas outlet; 120. Liquid outlet; 130. Compressor;

[0026] 140. Heat exchanger; 150. Cooler; 160. Gas-liquid separator;

[0027] 200, liquid reservoir; 210, water supply pipe;

[0028] 300. Water and gas co-container;

[0029] 310, air storage chamber; 320, liquid storage chamber; 330, water-permeable member;

[0030] 400, water storage unit; 410, water pipeline; 420, valve;

[0031] 500, turbine unit; 510, turbine;

[0032] 600. Spray device; 610. Steam generator; 620. Nozzle;

[0033] 700, second water pump; 710, first water pump; 800, circulation pump;

[0034] 900, cooling tower; 910, heater; 920, high temperature tank;

[0035] 930. Cryogenic tank; 940. Electric motor; 950. Generator. DETAILED DESCRIPTION

[0036] The following describes embodiments of the present invention in detail. Examples of the embodiments are shown in the accompanying drawings, wherein the same or similar reference numerals throughout represent the same or similar elements or elements having the same or similar functions. The embodiments described below with reference to the accompanying drawings are exemplary and are intended only to explain the present invention and are not to be construed as limiting the present invention.

[0037] In the description of the present invention, it should be understood that the terms "center", "longitudinal", "lateral", "length", "width", "thickness", "up", "down", "front", "back", "left", "right", "vertical", "horizontal", "top", "bottom", "inside", "outside", "clockwise", "counterclockwise", "axial", "radial", "circumferential" and the like to indicate orientations or positional relationships based on the orientations or positional relationships shown in the accompanying drawings, and are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and therefore should not be understood as limiting the present invention.

[0038] The following describes a steam constant-pressure compressed air energy storage system 1000 according to an embodiment of the present invention with reference to the accompanying drawings.

[0039] like Figure 1 As shown, a steam constant-pressure compressed air energy storage system 1000 according to an embodiment of the present invention includes: an air compression unit 100, a liquid storage tank 200, a water-gas co-container 300, a water storage unit 400, a turbine unit 500 and a spray device 600.

[0040] The air compression unit 100 is used to compress the air and perform gas-liquid separation on the air. Figure 1 As shown, the air compression unit 100 has a gas outlet 110 and a liquid outlet 120. This reduces the difficulty of discharging gas and liquid from the air compression unit 100 to a certain extent, so that the gas and liquid can be discharged from the gas outlet 110 and the liquid outlet 120 respectively and enter the next step of the steam constant-pressure compressed air energy storage system 1000, thereby ensuring the operating performance of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0041] It should be noted that by setting up the air compression unit 100 and setting it to compress air, the air in the environment can be compressed to a high-pressure state, so that the energy density of the air is increased, which is convenient for storage and is beneficial to improving the energy storage efficiency of the steam constant-pressure compressed air energy storage system 1000; at the same time, the air compression unit 100 is set to perform gas-liquid separation on the air, which can solve the harm caused by the liquid in the compressed air to the air compression unit 100, and also make the gas discharged by the air compression unit 100 purer, and to a certain extent can reduce the content of impurities and moisture in the gas discharged by the air compression unit 100, thereby improving the quality of the gas, which is beneficial to the subsequent energy conversion and utilization process of the steam constant-pressure compressed air energy storage system 1000, thereby improving the performance of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0042] like Figure 1 As shown, the liquid reservoir 200 is connected to the liquid outlet 120 and is used to store liquid to facilitate liquid recycling, improve energy utilization, and improve the performance of the steam constant pressure compressed air energy storage system 1000.

[0043] In a specific example, the liquid stored in the liquid reservoir 200 is condensed water, and the temperature of the condensed water is generally around 40°C.

[0044] like Figure 1 As shown, the water-gas co-container 300 includes an air storage chamber 310 and a liquid storage chamber 320. The air storage chamber 310 is connected to the gas outlet 110, and the liquid storage chamber 320 is connected to the water storage unit 400. The water storage unit 400 is used to receive liquid in the liquid storage chamber 320 and to transport liquid toward the liquid storage chamber 320. The provision of the air storage chamber 310 and the liquid storage chamber 320 in the water-gas co-container 300 facilitates the use of the water-gas co-container 300 to simultaneously store both liquid and gas.

[0045] At the same time, by setting the gas storage chamber 310 to connect to the gas outlet 110, so that the gas storage chamber 310 can receive the gas discharged from the gas outlet 110, gas leakage can be avoided to a certain extent, and the purpose of gas storage can be achieved, which is beneficial to the subsequent energy conversion and energy utilization of the steam constant pressure compressed air energy storage system 1000.

[0046] In addition, by setting the liquid storage chamber 320 to be interconnected with the water storage unit 400, the liquid between the liquid storage chamber 320 and the water storage unit 400 can circulate with each other, which is beneficial to recover the liquid in the liquid storage chamber 320, improves energy utilization, and facilitates the use of the water storage unit 400 to transport liquid toward the liquid storage chamber 320, thereby ensuring the subsequent energy conversion and energy utilization performance of the steam constant pressure compressed air energy storage system 1000 to a certain extent.

[0047] like Figure 1 As shown, the turbine unit 500 is connected to the gas storage chamber 310, which is used to transport gas to the turbine unit 500. To a certain extent, this ensures a continuous and stable gas supply to the turbine unit 500, allowing the turbine unit 500 to maintain a stable mechanical energy output for a long time, thereby improving the reliability and stability of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0048] In some embodiments, when the gas storage chamber 310 delivers gas toward the turbine unit 500, the gas impacts the blades, driving the rotor to rotate, thereby converting the kinetic energy of the gas into mechanical energy, ensuring the working performance of the turbine unit 500 to a certain extent.

[0049] It should be noted that during operation, the turbine unit 500 can reduce the pressure of the gas to a certain extent by doing work on the expansion of the gas, so that the pressure in the steam constant-pressure compressed air energy storage system 1000 is maintained within a reasonable range, avoiding damage to other components of the steam constant-pressure compressed air energy storage system 1000 due to excessive pressure, thereby ensuring the safety and stability of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0050] like Figure 1 As shown, the spray device 600 is connected to the liquid reservoir 200 and is used to spray steam toward the air storage chamber 310. By increasing the air temperature in the air storage chamber 310, the drop in air pressure in the air storage chamber 310 caused by degassing can be offset, thereby maintaining a constant pressure in the air storage chamber 310. This ensures a constant pressure at the inlet of the turbine unit 500. To a certain extent, this can maintain a constant pressure at the inlet of the turbine unit 500, preventing the turbine unit 500 from operating at non-rated conditions for extended periods of time, thereby improving the operating efficiency and stability of the steam constant-pressure compressed air energy storage system 1000.

[0051] In some embodiments, the liquid reservoir 200 receives condensed water precipitated from the air compression unit 100. Since the spray device 600 is connected to the liquid reservoir 200, the condensed water in the liquid reservoir 200 can be transported to the spray device 600. The spray device 600 is used to heat the received condensed water into steam and spray it into the air storage chamber 310, so as to achieve the purpose of spraying steam toward the air storage chamber 310 using the spray device 600.

[0052] Among them, steam can release a certain amount of latent heat in the process of being sprayed into the air storage chamber 310, thereby increasing the temperature in the air storage chamber 310, and further to a certain extent offsetting the gas pressure drop caused by the turbine unit 500 doing work on the gas expansion, thereby greatly increasing the density of the gas, so that the pressure in the air storage chamber 310 is maintained at a stable pressure value, thereby keeping the pressure at the inlet of the turbine unit 500 constant, avoiding the turbine unit 500 from working in non-rated conditions for a long time, which is beneficial to improving the working efficiency and working stability of the steam constant-pressure compressed air energy storage system 1000, thereby improving the working performance of the steam constant-pressure compressed air energy storage system 1000.

[0053] It is also worth noting that the spray device 600 of the present invention is connected to the liquid reservoir 200, and the liquid reservoir 200 is connected to the liquid outlet 120 of the air compression unit 100, so that the steam constant-pressure compressed air energy storage system 1000 of the present invention can directly use the liquid of the air compression unit 100 to spray steam toward the air storage chamber 310 without the aid of an external heat source, thereby improving the energy utilization rate of the steam constant-pressure compressed air energy storage system 1000 itself.

[0054] That is to say, the steam constant-pressure compressed air energy storage system 1000 of the present invention not only improves the energy storage efficiency and working stability of the steam constant-pressure compressed air energy storage system 1000, but also improves the utilization rate of energy.

[0055] As can be seen from the above structure, the steam constant-pressure compressed air energy storage system 1000 of the embodiment of the present invention, by providing a spray device 600, and configuring the spray device 600 to be connected to the liquid storage tank 200 and configured to spray steam toward the air storage chamber 310, not only realizes energy recovery, but also facilitates making the pressure in the air storage chamber 310 constant. Since the air storage chamber 310 is used to transport gas toward the turbine unit 500, the pressure at the inlet of the turbine unit 500 can be kept constant, which is beneficial to improving the working efficiency and working stability of the steam constant-pressure compressed air energy storage system 1000, thereby ensuring the working performance of the steam constant-pressure compressed air energy storage system 1000.

[0056] In addition, by setting up a water storage unit 400 and setting the liquid storage chamber 320 to be interconnected with the water storage unit 400, the liquid in the liquid storage chamber 320 can flow into the water storage unit 400, thereby realizing the recovery of the liquid and improving the utilization rate of the liquid energy in the steam constant pressure compressed air energy storage system 1000 to a certain extent.

[0057] It can be understood that, compared with the prior art, the present application adopts a spray device 600 to spray steam toward the air storage chamber 310 to make the pressure in the air storage chamber 310 constant, thereby maintaining the pressure at the inlet of the turbine unit 500 constant, which is beneficial to improving the working efficiency and working stability of the steam constant-pressure compressed air energy storage system 1000. In addition, by providing a water storage unit 400 interconnected with the liquid storage chamber 320, the liquid in the liquid storage chamber 320 can be stored in the water storage unit 400, and by directly using the liquid of the air compression unit 100 to spray steam toward the air storage chamber 310, without the help of an external heat source, the utilization rate of liquid energy in the steam constant-pressure compressed air energy storage system 1000 can be improved to a certain extent.

[0058] In some embodiments, the water-gas co-container 300 can be understood as a storage tank and can be made of high-strength steel. This allows the water-gas co-container 300 to have good sealing properties to a certain extent, thereby preventing the leakage of liquid and gas in the water-gas co-container 300, thereby ensuring the performance of the steam constant-pressure compressed air energy storage system 1000.

[0059] Among them, the thickness and steel selection of the water-gas co-container 300 can be determined according to the gas storage pressure of the steam constant-pressure compressed air energy storage system 1000. As long as the water-gas co-container 300 has a good sealing effect, the present invention does not impose any restrictions here.

[0060] In some embodiments, the water storage unit 400 is a barrier lake or an artificial reservoir.

[0061] In some embodiments, as Figure 1 As shown, the steam constant-pressure compressed air energy storage system 1000 further includes a water pipeline 410 and a valve 420. The water pipeline 410 is used to connect the liquid storage chamber 320 of the water-gas co-container 300 and the water storage unit 400. The valve 420 is provided on the water pipeline 410 to control the opening and closing of the water pipeline 410. This allows the water storage unit 400 to receive liquid from the liquid storage chamber 320 and to use the water storage unit 400 to transport liquid to the liquid storage chamber 320, thereby improving energy utilization and enhancing the exhaust performance of the water-gas co-container 300.

[0062] In some embodiments, the valve 420 is a two-way valve to allow liquid to flow between the water storage unit 400 and the liquid storage chamber 320 .

[0063] In some embodiments, as Figure 1As shown, the spray device 600 includes a steam generator 610 and a nozzle 620. The steam generator 610 is connected to the liquid reservoir 200 and the nozzle 620 respectively. The nozzle 620 is disposed in the gas storage chamber 310. By arranging the nozzle 620 in the gas storage chamber 310, the spray device 600 can be used to spray steam toward the gas storage chamber 310, thereby maintaining a constant pressure in the gas storage chamber 310 and reducing the difficulty of injecting steam into the gas storage chamber 310.

[0064] At the same time, by setting up a steam generator 610 and setting the steam generator 610 to be connected to the liquid reservoir 200 and the nozzle 620 respectively, the condensed water in the liquid reservoir 200 can be heated to form steam by the steam generator 610, which can ensure that the steam has a certain amount of heat to a certain extent, so that the steam can be sprayed into the air storage chamber 310 by the nozzle 620. In the air storage chamber 310, the steam can release a certain amount of latent heat, thereby increasing the temperature in the air storage chamber 310, and to a certain extent, offsetting the gas pressure drop caused by the turbine unit 500 doing work on the expansion of the gas, thereby greatly increasing the density of the stored gas, so that the pressure in the air storage chamber 310 is constant, thereby ensuring the working stability of the steam constant-pressure compressed air energy storage system 1000.

[0065] In some embodiments, as Figure 1 As shown, the nozzle 620 is disposed near and fixedly connected to the top wall of the gas storage chamber 310. Disposing the nozzle 620 near the top wall of the gas storage chamber 310 facilitates spraying steam from the top of the gas storage chamber 310 toward the bottom of the gas storage chamber 310. This facilitates even and rapid steam spraying into the gas storage chamber 310 under the action of gravity, allowing the steam to fully contact and exchange heat with the gas through the spray device 600, thereby raising the gas temperature to offset the gas pressure drop caused by the degassing of the steam constant-pressure compressed air energy storage system 1000, thereby ensuring a constant pressure in the gas storage chamber 310 to a certain extent.

[0066] At the same time, by fixing the nozzle 620 to the top wall, the air storage chamber 310 is used to support the nozzle 620, thereby improving the position stability of the nozzle 620 and ensuring the working performance of the nozzle 620 to a certain extent.

[0067] In some embodiments, the nozzle 620 may be connected to the top wall of the air storage chamber 310 by welding, bonding, or bolting, so as to achieve a fixed connection between the nozzle 620 and the top wall of the air storage chamber 310 .

[0068] In some embodiments, as Figure 1As shown, the steam generator 610 is arranged on the periphery of the water-gas co-container 300. On the first hand, it is convenient to realize the coordinated communication between the steam generator 610 and the liquid reservoir 200, reducing the difficulty of the communication between the steam generator 610 and the liquid reservoir 200; on the second hand, it can reduce the difficulty of assembling the steam generator 610; on the third hand, it can avoid the steam generator 610 occupying the space in the water-gas co-container 300, thereby ensuring the volume of the water-gas co-container 300, so that to a certain extent it can meet the volume required by the steam constant-pressure compressed air energy storage system 1000, so as to facilitate the subsequent work of the steam constant-pressure compressed air energy storage system 1000.

[0069] In some embodiments, as Figure 1 As shown, the steam constant-pressure compressed air energy storage system 1000 further includes a circulation pump 800, which is connected between the liquid reservoir 200 and the steam generator 610. The circulation pump 800 is used to control the flow of liquid delivered to the steam generator 610. This achieves reasonable regulation and control of the flow of condensed water delivered to the steam generator 610, and to a certain extent, enables the air pressure of the water-gas co-container 300 to be stably controlled, thereby preventing the continuous change of the air pressure in the water-gas co-container 300 from affecting the operation of the steam constant-pressure compressed air energy storage system 1000, thereby improving the operating stability and safety of the steam constant-pressure compressed air energy storage system 1000.

[0070] In some embodiments, as Figure 1 As shown, the steam constant-pressure compressed air energy storage system 1000 further includes a water supply pipe 210 and a first water pump 710. The water supply pipe 210 connects the liquid outlet 120 and the liquid reservoir 200. The first water pump 710 is disposed on the water supply pipe 210 and is used to control the water supply pipe 210 to transport liquid toward the liquid reservoir 200. This facilitates the pumping of condensate separated by the air compression unit 100 through the water supply pipe 210 to the liquid reservoir 200 for storage, ensuring, to a certain extent, that the liquid reservoir 200 can obtain a sufficient flow of condensate, thereby maintaining the operating performance of the steam constant-pressure compressed air energy storage system 1000.

[0071] In some embodiments, as Figure 1As shown, a water-gas co-container 300 is provided with a water-permeable member 330 that can move up and down. The upper side of the water-permeable member 330 forms an air storage chamber 310, and the lower side of the water-permeable member 330 forms a liquid storage chamber 320. The liquid in the air storage chamber 310 can flow into the liquid storage chamber 320 through the water-permeable member 330, and the water-permeable member 330 moves up and down in response to changes in the liquid level in the liquid storage chamber 320. The provision of the water-permeable member 330 not only enables the water-gas co-container 300 to store both gas and liquid simultaneously, but also effectively isolates the gas and liquid to a certain extent, thereby greatly preventing the gas in the air storage chamber 310 from dissolving in the liquid in the liquid storage chamber 320. This maintains the independence of the gas and liquid and the stability of the steam constant-pressure compressed air energy storage system 1000, thereby ensuring the performance of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0072] At the same time, by forming an air storage chamber 310 on the upper side of the water permeable member 330 and a liquid storage chamber 320 on the lower side of the water permeable member 330, it can be ensured that the liquid in the air storage chamber 310 can flow into the liquid storage chamber 320 through the water permeable member 330 under the action of gravity, thereby reducing the difficulty of liquid flow in the air storage chamber 310.

[0073] In addition, by configuring the water-permeable member 330 to move up and down following the changes in the liquid level in the liquid storage chamber 320 , it is beneficial to change the volume of the air storage chamber 310 and the liquid storage chamber 320 , and it is convenient to control the pressure in the air storage chamber 310 and the liquid storage chamber 320 .

[0074] In some embodiments, the water permeable member 330 is arranged at the junction surface between the gas in the air storage chamber 310 and the liquid in the liquid storage chamber 320 in the water-gas co-container 300. The water permeable member 330 can float freely on the junction surface and can move up and down with the change of the liquid level in the water-gas co-container 300, thereby facilitating the use of the water permeable member 330 to control the pressure in the air storage chamber 310 and the liquid storage chamber 320.

[0075] In some embodiments, the water permeable member 330 is provided with a water permeable hole, so that the liquid in the air storage chamber 310 can flow into the liquid storage chamber 320 through the water permeable member 330 .

[0076] In some embodiments, the water permeable member 330 is made of expanded polytetrafluoroethylene (ePTFE). ePTFE is highly hydrophobic and can achieve the effect of blocking gas dissolution, thereby ensuring the hydrophobicity of the water permeable member 330. To a certain extent, the water permeable member 330 can be made extremely hydrophobic, so that the liquid cannot wet the surface of the water permeable member 330. At the same time, the water permeable holes on the water permeable member 330 are set to a microporous structure. The microporous structure has the characteristic of high pressure resistance and can ensure the water permeability of the water permeable member 330 to a certain extent, thereby achieving effective isolation of gas and liquid.

[0077] In some embodiments, as Figure 1 As shown, the water storage unit 400 is installed at a higher height than the water-gas co-container 300. This allows a certain liquid level difference to form between the water storage unit 400 and the water-gas co-container 300, thereby facilitating the use of the water pressure difference to maintain a constant pressure state for the compressed air in the water-gas co-container 300 during operation.

[0078] It should be noted that when the liquid level difference between the water-gas co-container 300 and the water storage unit 400 is 100 meters, a water pressure of about 1 MPa can be formed between the water-gas co-container 300 and the water storage unit 400, so that it is convenient to utilize the water pressure difference to make the compressed air in the water-gas co-container 300 in a constant pressure state during operation, thereby ensuring the working stability of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0079] In some embodiments, as Figure 1 As shown, the steam constant pressure compressed air energy storage system 1000 further includes a motor 940, which is connected to the air compression unit 100. The motor 940 provides a power source for the air compression unit 100. The rotation of the motor 940 drives the air compression unit 100 to operate, so that the air compression unit 100 can compress the external ambient air, thereby ensuring the working performance of the air compression unit 100 to a certain extent.

[0080] In some embodiments, as Figure 1 As shown, the air compression unit 100 includes multiple stages, and each stage of the air compression unit 100 includes a compressor 130, a heat exchanger 140, a cooler 150, and a gas-liquid separator 160 connected in series. The gas-liquid separator 160 has a gas outlet 110 and a liquid outlet 120. By providing multiple stages of the air compression unit 100, it is possible to compress the external ambient air in sequence using the multiple stages of the air compression unit 100, thereby achieving maximum compression of the external ambient air, improving the working efficiency of the air compression unit 100 to a certain extent, and further improving the working efficiency of the steam constant-pressure compressed air energy storage system 1000 to a certain extent.

[0081] At the same time, by configuring each stage of the air compression unit 100 to include a compressor 130, a heat exchanger 140, a cooler 150 and a gas-liquid separator 160 connected in series, and configuring the gas-liquid separator 160 to have a gas outlet 110 and a liquid outlet 120, it is beneficial to ensure the working performance of each stage of the air compression unit 100, so that each stage of the air compression unit 100 can compress the air and perform gas-liquid separation on the air.

[0082] In some embodiments, the compressor 130 is used to receive external air and compress the air to a high-pressure state, which is beneficial to improving the energy density of the air and facilitating the efficient storage and release of the air; the heat exchanger 140 is used to cool the compressed air, and heat can be recovered through the heat exchanger 140 to reduce energy loss and improve the overall efficiency of the steam constant-pressure compressed air energy storage system 1000; the cooler 150 is used to further reduce the temperature of the compressed air to prevent high-temperature air from damaging subsequent equipment and the steam constant-pressure compressed air energy storage system 1000; the gas-liquid separator 160 is used to remove liquid water in the compressed air to prevent moisture from corroding or damaging the compressor 130 in the air compression unit 100, thereby extending the service life of the steam constant-pressure compressed air energy storage system 1000.

[0083] Through the above-mentioned setting, in some embodiments, when it is necessary to store gas using the steam constant-pressure compressed air energy storage system 1000, the compressor 130 is first used to compress the air in the external environment to a high-pressure state, and then the high-pressure air is transported to the heat exchanger 140. Since the compressor 130 generates a large amount of heat when compressing the air, the heat exchanger 140 can absorb and store this heat to reduce energy loss. Then, the cooler 150 is used to cool down the compressed air temperature. At this time, the water vapor in the compressed air is cooled to the dew point to form condensed water. The gas-liquid separator 160 is used to separate the gas and condensed water in the compressed air, and the gas and condensed water are discharged through the gas outlet 110 and the liquid outlet 120 respectively. Among them, the gas enters the water-gas co-container 300 for storage, and the condensed water enters the liquid reservoir 200 for storage, so that the next link of the steam constant-pressure compressed air energy storage system 1000 can be carried out.

[0084] In some embodiments, as Figure 1 As shown, the multi-stage air compression units 100 are arranged sequentially in the direction of air flow. In two adjacent air compression units 100, the compressor 130 of the downstream air compression unit 100 is connected to the gas outlet 110 of the upstream air compression unit 100. The water-gas co-container 300 is connected to the gas outlet 110 of the last-stage air compression unit 100, and the liquid reservoir 200 is respectively connected to the liquid outlet 120 of the multi-stage air compression unit 100. It should be noted that the upstream mentioned here can be understood as a position close to the air inlet in the direction of air flow, and the downstream can be understood as a position close to the air outlet in the direction of air flow.

[0085] Among them, by setting the compressor 130 of the downstream air compression unit 100 to be connected with the gas outlet 110 of the upstream air compression unit 100, it is convenient to use the downstream compressor 130 to re-compress the gas discharged from the upstream air compression unit 100, which can improve the air compression efficiency of the air compression unit 100 to a certain extent, and can ensure that the gas and liquid in the compressed air are completely separated, thereby ensuring the purity of the gas and liquid to a certain extent, thereby ensuring the performance of the steam constant-pressure compressed air energy storage system 1000.

[0086] At the same time, by arranging the liquid reservoir 200 to be connected to the liquid outlets 120 of the multi-stage air compression units 100 respectively, the liquid reservoir 200 can simultaneously recover the liquid discharged from the multi-stage air compression units 100, which is beneficial to energy recovery.

[0087] In the description of the present invention, unless otherwise specified, "multi-stage" means two or more stages.

[0088] In some embodiments, as Figure 1 As shown, the steam constant pressure compressed air energy storage system 1000 further includes a cooling tower 900, which is connected to the cooler 150 and is used to absorb heat from the air discharged from the cooler 150. This can ensure the cooling effect of the cooler 150 to a certain extent, thereby ensuring the continuous operation of the cooler 150.

[0089] In some embodiments, as Figure 1 As shown, the steam constant pressure compressed air energy storage system 1000 further includes a second water pump 700, which is connected to the cooling tower 900 and the cooler 150. The second water pump 700 is used to transport the cooling medium in the cooling tower 900 to the cooler 150 and perform heat exchange with the air in the cooler 150, thereby facilitating the reduction of the air temperature in the cooler 150 and ensuring the working performance of the cooler 150.

[0090] In the description of the present invention, features defined as “first” or “second” may explicitly or implicitly include one or more such features, and are used to distinguish and describe features, without any distinction in order or importance.

[0091] It should be noted that if Figure 1 As shown, when the air compression unit 100 includes multiple stages, the cooling tower 900 is respectively connected to the cooler 150 in each stage of the air compression unit 100.

[0092] In some embodiments, the cooling medium in the cooling tower 900 is softened water, and the supply water temperature and return water temperature of the cooling tower 900 are generally around 30°C and 37°C.

[0093] In some embodiments, as Figure 1 As shown, the turbine unit 500 includes multiple turbines 510 connected in series. The multiple turbines 510 in series cooperate to facilitate staged expansion of the high-pressure gas in the gas storage chamber 310. Each turbine 510 only bears a portion of the pressure drop, allowing the gas to expand and perform work in a state closer to the ideal state, thereby improving the energy conversion efficiency of the entire steam constant-pressure compressed air energy storage system 1000.

[0094] It should be noted that, since the turbine unit 500 in the steam constant-pressure compressed air energy storage system 1000 needs to bear a certain power load, and the high-pressure gas in the gas storage chamber 310 passes through a single turbine 510, due to the large pressure drop, it may cause the flow loss of the gas in the turbine 510 to increase, and the gas energy conversion efficiency to decrease, and it may be possible that the energy conversion required by the steam constant-pressure compressed air energy storage system 1000 cannot be achieved.

[0095] Based on this, the present invention sets up multiple turbines 510 connected in series to achieve graded expansion of the high-pressure gas in the gas storage chamber 310, allowing the gas to expand and do work in a state closer to the ideal state, thereby facilitating the conversion of the internal energy of the gas expansion into the mechanical energy of the turbine 510, thereby improving the energy conversion efficiency of the entire steam constant-pressure compressed air energy storage system 1000.

[0096] In the description of the present invention, unless otherwise specified, "plurality" means two or more.

[0097] In some embodiments, as Figure 1 As shown, the steam constant pressure compressed air energy storage system 1000 further includes a generator 950, and the turbine unit 500 is connected to the generator 950. The turbine unit 500 is used to transfer mechanical energy to the generator 950, and the generator 950 converts the mechanical energy into electrical energy, thereby enabling the steam constant pressure compressed air energy storage system 1000 to provide electrical energy to external devices.

[0098] In some embodiments, as Figure 1 As shown, a heater 910 is connected upstream of each turbine 510 to heat the gas entering the turbine 510, thereby increasing the gas temperature to a certain extent, allowing the turbine 510 to extract more energy. The gas parameters and flow characteristics can also be changed to keep the operating conditions of the turbine 510 away from the surge boundary, ensuring the stable operation of the turbine 510 to a certain extent, thereby ensuring the reliability and safety of the steam constant pressure compressed air energy storage system 1000.

[0099] In some embodiments, as Figure 1As shown, the steam constant pressure compressed air energy storage system 1000 also includes a high temperature tank 920 and a low temperature tank 930, the heater 910 and the heat exchanger 140 are connected in series, the high temperature tank 920 is arranged upstream of the heater 910 and is respectively connected to the heater 910 and the heat exchanger 140, and the low temperature tank 930 is arranged downstream of the heater 910 and is respectively connected to the heater 910 and the heat exchanger 140. That is to say, during the air flow process, the air flows through the heat exchanger 140, the high-temperature tank 920, the heater 910 and the low-temperature tank 930 in sequence. The high-temperature tank 920 is used to store the high-temperature heat of the heat-conducting medium exchanged by the heat exchanger 140 during the air compression process of the air compression unit 100, so as to facilitate the use of the recovered heat to improve the heating performance of the heater 910. To a certain extent, it can reduce or even avoid the need for the turbine unit 500 to burn additional fuel when the heater 910 is running during the air expansion stage, thereby reducing fuel costs and related operating and maintenance costs. The low-temperature tank 930 is used to receive the heat-conducting medium of the low-temperature heat exchanged by the heater 910 during the air expansion stage of the turbine unit 500, so as to facilitate the use of the low-temperature medium in the low-temperature tank 930 to improve the heat exchange performance of the heat exchanger 140, and maintain the normal operation of the steam constant-pressure compressed air energy storage system 1000.

[0100] In some embodiments, the heat transfer medium of the high-temperature tank 920 is generally materials such as pressurized water, thermal oil or molten salt. The above-mentioned heat transfer medium can quickly release its own heat, facilitating efficient heat exchange with the heater 910 during the operation of the steam constant-pressure compressed air energy storage system 1000, thereby improving the working performance of the heater 910.

[0101] In some embodiments, the heat transfer medium of the low-temperature tank 930 is generally pressurized water, heat transfer oil or molten salt and other materials. The above heat transfer medium can quickly absorb the heat of the air, facilitating efficient heat exchange with the heat exchanger 140 during the operation of the steam constant-pressure compressed air energy storage system 1000, thereby improving the working performance of the heat exchanger 140.

[0102] The energy storage method according to an embodiment of the present invention is described below.

[0103] According to an embodiment of the present invention, an energy storage method is applied to the aforementioned steam constant-pressure compressed air energy storage system 1000. The energy storage method includes:

[0104] During the energy storage working stage, the liquid output by the air compression unit 100 flows to the liquid reservoir 200, and the gas output by the air compression unit 100 flows to the gas storage chamber 310 of the water-gas co-container 300. The liquid in the liquid storage chamber 320 of the water-gas co-container 300 can flow to the water storage unit 400 to perform air energy storage.

[0105] In a specific example, during the energy storage working stage, the pressure ratio of the gas in the entire steam constant pressure compressed air energy storage system 1000 remains unchanged under different states, and the motor 940 drives the compressor 130 of the first-stage air compression unit 100 to operate. After the external ambient air is compressed by the compressor 130, it enters the heat exchanger 140 of the first-stage air compression unit 100 for the first cooling, and then is cooled again in the cooler 150 of the first-stage air compression unit 100 to make the air temperature close to the ambient temperature. At this time, the dew point temperature of the compressed air will increase, causing the water vapor in the air to condense when it is close to the ambient temperature, and finally the condensed water is separated and precipitated in the gas-liquid separator 160 of the first-stage air compression unit 100. The low-humidity air is separated from the gas-liquid separator 160 of the first-stage air compression unit 100 and continues to be compressed in the compressor 130 of the second-stage air compression unit 100. After compression, it is cooled by the heat exchanger 140 and the cooler 150 of the second-stage air compression unit 100 and then enters the gas-liquid separator 1 60, and finally the gas flows from the gas outlet 110 to the gas storage chamber 310 of the water-gas co-container 300, and the condensed water separated by the gas-liquid separator 160 of the first-stage air compression unit 100 and the gas-liquid separator 160 of the second-stage air compression unit 100 is pumped to the liquid storage 200 by the first water pump 710 through the water supply pipe 210 for storage. When the compressor 130 continuously fills the gas storage chamber 310 of the water-gas co-container 300 with high-pressure, low-temperature and low-humidity gas at a constant pressure, the valve 420 is opened at the same time to remove the water. The liquid in the liquid storage chamber 320 of the gas-water co-container 300 is transported to the water storage unit 400 through the water pipe 410. After the liquid in the liquid storage chamber 320 of the water-gas co-container 300 is drained, the valve 420 is closed and the compressor 130 can continue to compress the air for energy storage. When the gas pressure in the gas storage chamber 310 of the water-gas co-container 300 reaches the pressure that matches the height difference between the water storage unit 400 and the water-gas co-container 300, the compressor 130 stops compressing the air. At this point, the energy storage working stage of the steam constant-pressure compressed air energy storage system 1000 ends.

[0106] During the energy release working stage, the liquid in the water storage unit 400 flows to the liquid storage chamber 320, and the air stored in the air storage chamber 310 is input into the turbine unit 500. At the same time, the liquid stored in the liquid reservoir 200 can be sprayed into the air storage chamber 310 through the spray device 600, releasing latent heat to keep the air pressure in the air storage chamber 310 constant so as to perform work output.

[0107] In a specific example, during the energy release working stage, the air stored in the air storage chamber 310 is input into the turbine unit 500, and the gas in the air storage chamber 310 drives the turbine unit 500 to perform work, so that the turbine unit 500 can drive the generator 950 to generate electricity. When the pressure difference between the water storage unit 400 and the water-gas co-container 300 matches, the valve 420 is opened to allow the liquid in the water storage unit 400 to flow into the liquid storage chamber 320 of the water-gas co-container 300 through the water supply pipe 410. In the process of the liquid in the water-gas co-container 300 pushing the compressed air outward to perform work, the expansion of the gas will cause the temperature and pressure of the gas in the air storage chamber 310 to decrease. At this time, when the air in the water-gas co-container 300 is continuously compressed by the liquid pressure, the circulation pump 800 is started, and the condensed water stored in the liquid reservoir 200 generates steam through the steam generator 610 and then passes through the nozzle 620 is sprayed into the water-gas co-container 300. With the injection of high-pressure steam, the loss of gas pressure is compensated to a certain extent. The liquefied steam enters the liquid storage chamber 320 through the water-permeable member 330. The gas in the water-gas co-container 300 continues to be discharged to keep the gas pressure constant, and then the turbine unit 500 can make full use of the constant-pressure air discharged from the water-gas co-container 300 to generate electricity until the liquid in the liquid storage chamber 320 fills the entire gas storage chamber 310. At this time, the water-gas co-container 300 is full of liquid, and the gas in the water-gas co-container 300 is completely released. The circulating pump 800 and the valve 420 are closed, the turbine unit 500 stops running, and then the generator 950 also stops running. At this point, the energy release working stage of the steam constant-pressure compressed air energy storage system 1000 ends, thereby realizing the power generation process of the constant-pressure compressed air steam constant-pressure compressed air energy storage system 1000.

[0108] The energy storage method according to an embodiment of the present invention is applied to the aforementioned steam constant-pressure compressed air energy storage system 1000, which solves the variable operating conditions during the power generation process to a certain extent, and can improve the stability and reliability of the steam constant-pressure compressed air energy storage system 1000 in the energy storage working stage and the energy release working stage, thereby improving the working performance and energy utilization rate of the steam constant-pressure compressed air energy storage system 1000.

[0109] In the description of the present invention, it should be noted that, unless otherwise expressly specified or limited, the terms "mounted," "connected," and "connected" should be understood in a broad sense. For example, they may refer to fixed, detachable, or integral connections; mechanical or electrical connections; direct or indirect connections through an intermediate medium; and internal communication between two components. Those skilled in the art will understand the specific meanings of the above terms in the present invention based on the specific circumstances.

[0110] Figure 1A two-stage air compression unit 100 is shown for illustrative purposes, but after reading the above technical solution, ordinary technicians can obviously understand that the solution can be applied to the technical solution of a three-stage, four-stage, five-stage or more-stage air compression unit 100, which also falls within the scope of protection of the present invention.

[0111] The specific structures of the steam constant-pressure compressed air energy storage system 1000 and other components of the energy storage method according to the embodiment of the present invention, such as the motor 940 and the generator 950, are well known to ordinary technicians in this field and will not be described in detail here.

[0112] Throughout this specification, reference to terms such as "embodiment" or "example" indicates that the specific features, structures, materials, or characteristics described in conjunction with that embodiment or example are included in at least one embodiment or example of the present invention. In this specification, schematic representations of these terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials, or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

[0113] While embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that various changes, modifications, substitutions, and variations may be made to the embodiments without departing from the principles and spirit of the invention, and that the scope of the invention is defined by the claims and their equivalents.

Claims

1. A steam constant pressure compressed air energy storage system, characterized in that: include: An air compression unit (100), the air compression unit (100) is used to compress air and perform gas-liquid separation on the air, the air compression unit (100) having a gas outlet (110) and a liquid outlet (120); a liquid reservoir (200), the liquid reservoir (200) being in communication with the liquid outlet (120) and being used for storing liquid; a water-gas co-container (300) and a water storage unit (400); the water-gas co-container (300) comprises a gas storage chamber (310) and a liquid storage chamber (320); the gas storage chamber (310) is connected to the gas outlet (110); the liquid storage chamber (320) and the water storage unit (400) are connected to each other; the water storage unit (400) is used to receive liquid in the liquid storage chamber (320) and to transport liquid toward the liquid storage chamber (320); a turbine unit (500), the turbine unit (500) being in communication with the gas storage chamber (310), the gas storage chamber (310) being used to transport gas toward the turbine unit (500); A spray device (600) is connected to the liquid storage device (200) and is used to spray steam toward the gas storage chamber (310). By increasing the gas storage temperature of the gas storage chamber (310), the gas storage pressure drop of the gas storage chamber (310) caused by degassing can be offset, so that the pressure in the gas storage chamber (310) is constant.

2. The steam constant pressure compressed air energy storage system according to claim 1, characterized in that: The spray device (600) comprises a steam generator (610) and a nozzle (620), wherein the steam generator (610) is connected to the liquid reservoir (200) and the nozzle (620), respectively, and the nozzle (620) is disposed in the gas storage chamber (310); The nozzle (620) is arranged close to the top wall of the air storage chamber (310) and is fixedly connected to the top wall.

3. The steam constant pressure compressed air energy storage system according to claim 2, characterized in that: The invention also includes a circulation pump (800), wherein the circulation pump (800) is connected between the liquid storage tank (200) and the steam generator (610), and the circulation pump (800) is used to control the flow rate of the liquid delivered to the steam generator (610).

4. The steam constant pressure compressed air energy storage system according to claim 1, characterized in that: The water-gas co-container (300) is provided with a water-permeable member (330) that can move up and down. The upper side of the water-permeable member (330) forms the air storage chamber (310), and the lower side of the water-permeable member (330) forms the liquid storage chamber (320). The liquid in the air storage chamber (310) can flow to the liquid storage chamber (320) through the water-permeable member (330). The water-permeable member (330) moves up and down following the change of the liquid level in the liquid storage chamber (320).

5. The steam constant pressure compressed air energy storage system according to claim 1, characterized in that: The installation height of the water storage unit (400) is higher than the installation height of the water-gas co-container (300).

6. The steam constant pressure compressed air energy storage system according to any one of claims 1 to 5, characterized in that: The air compression unit (100) includes multiple stages, and each stage of the air compression unit (100) includes a compressor (130), a heat exchanger (140), a cooler (150), and a gas-liquid separator (160) connected in series, and the gas-liquid separator (160) has the gas outlet (110) and the liquid outlet (120); The multiple stages of air compression units (100) are arranged in sequence in the direction of air flow. In two adjacent stages of the air compression units (100), the compressor (130) of the downstream air compression unit (100) is connected to the gas outlet (110) of the upstream air compression unit (100). The water-gas co-container (300) is connected to the gas outlet (110) of the last stage of the air compression unit (100). The liquid reservoir (200) is respectively connected to the liquid outlets (120) of the multiple stages of the air compression units (100).

7. The steam constant pressure compressed air energy storage system according to claim 6, characterized in that: The invention also includes a cooling tower (900), the cooling tower (900) being connected to the cooler (150), and the cooling tower (900) being used to absorb heat from the air discharged from the cooler (150).

8. The steam constant pressure compressed air energy storage system according to claim 6, characterized in that: The turbine unit (500) includes a plurality of turbines (510) connected in series.

9. The steam constant pressure compressed air energy storage system according to claim 8, characterized in that: Each turbine (510) is connected upstream to a heater (910); The steam constant-pressure compressed air energy storage system further includes a high-temperature tank (920) and a low-temperature tank (930); the heater (910) and the heat exchanger (140) are connected in series; the high-temperature tank (920) is arranged upstream of the heater (910) and is respectively connected to the heater (910) and the heat exchanger (140); the low-temperature tank (930) is arranged downstream of the heater (910) and is respectively connected to the heater (910) and the heat exchanger (140).

10. An energy storage method, applied to the steam constant pressure compressed air energy storage system according to any one of claims 1 to 9, characterized in that: include: During the energy storage operation phase, the liquid outputted by the air compression unit (100) flows to the liquid storage device (200), the gas outputted by the air compression unit (100) flows to the gas storage chamber (310) of the water-gas co-container (300), and the liquid in the liquid storage chamber (320) of the water-gas co-container (300) can flow to the water storage unit (400) to perform air energy storage; During the energy release working stage, the liquid in the water storage unit (400) flows into the liquid storage chamber (320), and the air stored in the air storage chamber (310) is input into the turbine unit (500). At the same time, the liquid stored in the liquid reservoir (200) can be sprayed into the air storage chamber (310) through the spray device (600), releasing latent heat to keep the air pressure in the air storage chamber (310) constant, so as to perform work output.

Images