Temperature adjusting system of compressed air energy storage chamber and operation method

Abstract

The invention provides a temperature adjusting system of a compressed air energy storage chamber and an operation method.The temperature adjusting system of the compressed air energy storage chamber comprises an artificial chamber horizontally arranged underground, a vertical shaft arranged at the top of the artificial chamber, an air circulating pipeline and a water pipeline, and the air circulating pipeline and the water pipeline are arranged in the artificial chamber; an axial flow fan is arranged in an air inlet of the air circulating pipeline, the water pipeline comprises a water inlet pipeline and a water outlet pipeline, the water inlet pipeline is communicated with a water outlet of the warm water tank and an in-plant circulating cooling water inlet, the water outlet pipeline is communicated with a water inlet of the cold water tank and an in-plant circulating cooling water return port, and a spiral heat exchange pipe is arranged between the water inlet pipeline and the water outlet pipeline. The spiral heat exchange pipe is embedded in the air circulation pipeline behind the axial flow fan and used for exchanging heat with air in the chamber, adjusting the temperature of the air in the artificial chamber during inflation energy storage and deflation energy release, guaranteeing the structural safety of surrounding rock around the artificial chamber and prolonging the service life of sealing materials in the chamber.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly relates to a temperature regulation system and operation method for a compressed air energy storage chamber. Background Art

[0002] At present, the non-supplementary combustion compressed air energy storage technology is mainly divided into two types: artificial chamber gas storage and salt cavern gas storage. Among them, the non-supplementary combustion compressed air energy storage technology based on artificial chamber gas storage has greater development space due to its flexible site selection and less geographical condition restrictions.

[0003] Under the approximately adiabatic condition in the gas storage reservoir, during the charging energy storage stage of the gas storage reservoir, since the air in the gas storage reservoir is continuously compressed to generate heat, the temperature and pressure in the gas storage reservoir both rise rapidly; during the discharging energy release stage of the gas storage reservoir, since the air in the gas storage reservoir continuously expands to do work, the temperature and pressure in the gas storage reservoir both drop rapidly. The temperature and pressure change amplitudes of the gas storage reservoir during the charging energy storage and discharging energy release stages are proportional to the energy storage density of the gas storage reservoir. At present, the energy storage densities of the gas storage reservoirs of existing non-supplementary combustion compressed air energy storage projects in China are all small, about 1 - 4 kw·h / m³. The temperature and pressure changes of the gas storage reservoir during the charging energy storage and discharging energy release stages are small, and no temperature regulation and control device is set inside the gas storage reservoir. Since the construction cost of underground artificial chambers is much higher than the cost of salt cavern cavity formation, in order to reduce the investment in artificial chambers, the construction volume of artificial chambers should be reduced, and the energy storage density of artificial chamber gas storage reservoirs should be increased. However, in a compressed air energy storage system, as the energy storage density of the artificial chamber increases, under the approximately adiabatic condition, the temperature and pressure in the chamber will fluctuate greatly during the charging energy storage and discharging energy release stages, which not only has a serious adverse impact on the service life of the sealing materials of the artificial chamber and the safety of the surrounding rock mass structure, but also reduces the system cycle efficiency. At the same time, to increase the energy storage capacity, it is usually necessary to expand the construction volume of the chamber, but this will greatly increase the construction cost and limit the economic benefits.

[0004] In order to solve the problem of excessive temperature and pressure fluctuations in the artificial chamber caused by the increase in the energy storage density of the artificial chamber gas storage reservoir, it is urgent for technical personnel in this field to provide a temperature regulation system and operation method for a compressed air energy storage chamber, so as to ensure the structural safety of the surrounding rock mass of the artificial chamber and improve the service life of the sealing materials inside the chamber. Summary of the Invention

[0005] The technical problem to be solved by the present invention is to overcome the problem of excessive temperature and pressure fluctuations in the artificial chamber caused by the increase in the energy storage density of the artificial chamber gas storage reservoir, and provide a temperature regulation system and operation method for a compressed air energy storage chamber, and an effective technical solution for controlling temperature and pressure fluctuations, so as to ensure the system safety and cycle efficiency, and at the same time reduce the construction cost. The present invention provides the following technical solutions: A temperature regulation system for a compressed air energy storage chamber of the present invention includes an artificial chamber horizontally arranged underground and a vertical shaft provided at the top thereof. It further includes an air circulation pipeline and a water pipeline arranged in the artificial chamber. The air inlet and the air outlet at both ends of the air circulation pipeline are relatively arranged along both sides of the artificial chamber. An axial flow fan is provided in the air inlet of the air circulation pipeline. The water pipeline is arranged along the length direction of the vertical shaft and is arranged in the artificial chamber. The water pipeline includes a water inlet pipeline and a water outlet pipeline. The water inlet pipeline communicates with the water outlet of the warm water tank and the water inlet of the in-plant circulating cooling water. The water outlet pipeline communicates with the water inlet of the cold water tank and the water return port of the in-plant circulating cooling water. A spiral heat exchange tube is provided between the water inlet pipeline and the water outlet pipeline. The spiral heat exchange tube is embedded in the air circulation pipeline behind the axial flow fan for exchanging heat with the air in the chamber to regulate the temperature of the air in the artificial chamber during air charging energy storage and air discharging energy release.

[0006] While adopting the above technical solutions, the present invention can also adopt or combine the following technical solutions: The length direction of the air circulation pipeline is parallel to the axial direction of the artificial chamber. The air circulation pipeline is close to the bottom of the artificial chamber and both ends are bent upward to communicate with the divergent-shaped air branch main pipelines. The air branch main pipelines are close to the left and right sides of the artificial chamber.

[0007] As a preferred technical solution of the present invention, air branch pipes are arranged at intervals in the length direction of the air branch main pipelines of the air circulation pipeline, and circular diffusers are provided at the ports of the air branch pipes.

[0008] As a preferred technical solution of the present invention, the water inlet pipeline of the water pipeline communicates with the water inlet of the in-plant circulating cooling water through a third valve, and the water outlet pipeline communicates with the water return port of the in-plant circulating cooling water through a fourth valve.

[0009] As a preferred technical solution of the present invention, the water inlet pipeline of the water pipeline communicates with the water outlet of the warm water tank through a first valve, a check valve and a water pump in sequence, and the water outlet pipeline communicates with the water inlet of the cold water tank through a second valve.

[0010] As a preferred technical solution of the present invention, the temperature regulation system further includes a plurality of thermometers close to the air inlet of the air circulation pipeline, and the thermometers are evenly distributed along the circular cross-section of the chamber.

[0011] As a preferred technical solution of the present invention, the water pump, the axial flow fan, the third valve and the thermometer are respectively connected to a controller.

[0012] As a preferred technical solution of the present invention, a method for operating a temperature regulation system for a compressed air energy storage chamber includes the following steps: S11 Energy storage air charging in the artificial chamber: High-pressure air flows into the artificial chamber; S12 Water pipeline water inlet: Open the third valve and the fourth valve, close the first valve and the second valve, the water pump is in the shutdown state, and convey the internal cooling water of the in-plant circulating cooling water to the spiral heat exchange tube through the water pipeline.

[0013] S13 Heat exchange process: Start the axial flow fan, suck the air in the artificial chamber into the air circulation pipeline through the circular diffuser and the air branch pipe, the cold water flows in the spiral heat exchange tube, and exchanges heat with the air in the air circulation pipeline. After the cold water is heated, it flows into the return water of the in-plant circulating cooling water. At the same time, the air is cooled after passing through the spiral heat exchange tube.

[0014] S14 Air circulation and temperature regulation: The cooled air flows through the air circulation pipeline to the air main and branch pipeline on the left side of the artificial chamber, and then is evenly distributed into the artificial chamber through the air branch pipe and the circular diffuser to absorb the heat generated during the air charging and compression process in the artificial chamber.

[0015] S15 Control of air temperature: Monitor the air temperature in the artificial chamber through a thermometer. When the average temperature exceeds the preset temperature of the controller, the controller increases the opening of the third valve and the power of the axial flow fan to increase the cold water and air flow rates; when the average temperature is lower than the preset temperature of the controller, the controller reduces the opening of the third valve and the power of the axial flow fan to reduce the cold water and air flow rates, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

[0016] As a preferred technical solution of the present invention, the operation method further includes the following steps: S21 Energy release and air discharge in the artificial chamber: High-pressure air flows out of the artificial chamber; S22 Water pipeline water inlet: Open the first valve and the second valve, close the third valve and the fourth valve, start the water pump, and convey the warm water in the warm water tank to the spiral heat exchange tube through the water pipeline.

[0017] S23 Heat exchange process: Start the axial flow fan, suck the air in the artificial chamber into the air circulation pipeline through the circular diffuser and the air branch pipe, the warm water flows in the spiral heat exchange tube, and exchanges heat with the air in the air circulation pipeline. After the warm water is cooled, it flows into the cold water tank. At the same time, the air is heated after passing through the spiral heat exchange tube.

[0018] S24 Air circulation and temperature adjustment: The heated air flows through the air circulation pipeline to the air main and branch pipeline on the left side of the artificial chamber, and then is evenly distributed into the artificial chamber through the air branch pipe and the circular diffuser to make up for the heat lost during the air discharge and expansion process in the artificial chamber.

[0019] S25 Controls the air temperature: The air temperature in the artificial chamber is monitored by a thermometer. When the average temperature is lower than the preset temperature of the controller, the controller increases the power of the water pump and the axial flow fan to increase the flow rate of warm water and air. When the average temperature exceeds the preset temperature of the controller, the controller decreases the power of the water pump and the axial flow fan to reduce the flow rate of warm water and air, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

[0020] Compared with the prior art, the beneficial effects of the present invention are as follows: First, the temperature regulation system provided by the present invention can make the air in the artificial chamber circulate evenly, make the air temperature more uniform, and avoid the phenomena of local high temperature and local low temperature in the artificial chamber. During the energy storage charging and energy release deflation stages in the artificial chamber, it can effectively control the temperature and pressure fluctuations in the chamber, and the system can also monitor and adjust the temperature in the artificial chamber in real time, preventing the violent changes in temperature and pressure caused by the increase in energy storage density, so as to ensure that the air temperature and pressure during the energy storage charging and energy release deflation in the artificial chamber are always within the safe range, and improve the cycle efficiency of the compressed air energy storage system.

[0021] Second, the temperature regulation system provided by the present invention can make the temperature in the artificial chamber be adjusted within the preset temperature range during both the charging energy storage and deflation energy release stages, thereby narrowing the pressure change range of the artificial chamber during the charging energy storage and deflation energy release stages, and directly reducing the aging speed of the sealing material due to thermal stress. Therefore, the present invention can significantly extend the service life of the sealing material, reduce the maintenance and replacement frequency, and lower the operation cost.

[0022] Third, the temperature regulation system provided by the present invention can effectively reduce the adverse effects on the surrounding rock structure due to the increase in energy storage density by controlling the temperature and pressure fluctuations in the artificial chamber. The temperature regulation system can prevent the thermal stress generated by the surrounding rock due to temperature changes, so as to ensure the long-term stability and safety of the surrounding rock structure, and avoid potential risks caused by structural instability.

[0023] Fourth, the temperature regulation system provided by the present invention can improve the energy storage density of the artificial chamber on the premise of ensuring controllable temperature and pressure fluctuations. This not only improves the energy storage efficiency of the artificial chamber, but also reduces the construction volume of the artificial chamber, lowers the construction cost, and realizes the maximization of economic benefits. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] The drawings are used to provide a further understanding of the present invention, and constitute a part of the specification. Together with the embodiments of the present invention, they are used to explain the present invention, and do not constitute a limitation to the present invention. In the drawings: Figure 1 is a schematic structural diagram of Embodiment 1 of the temperature regulation system of the present invention; Figure 2Schematic diagram of the structure of Embodiment 2 of the temperature regulation system of the present invention; Figure 3 Side view of the air circulation duct, air main and branch ducts, and diffuser of the present invention; Figure 4 Front view of the connection of the air main and branch ducts, air branch ducts, and diffuser of the present invention; Figure 5 Schematic diagram of the structure of the thermometer with a circular cross-section in the artificial chamber of the present invention; Figure 6 Flow chart of the artificial chamber in Embodiment 2 of the present invention during energy storage and inflation; Figure 7 Flow chart of the artificial chamber in Embodiment 2 of the present invention during energy release and deflation; In the figure: 1, artificial chamber; 2, diffuser; 3, air branch duct; 4, air main and branch duct; 5, air circulation duct; 6, axial flow fan; 7, spiral heat exchange tube; 8, warm water tank; 9, cold water tank; 10, water pipe; 10-1, inlet pipe; 10-2, outlet pipe; 11, water pump; 12, first valve; 13, second valve; 14, third valve; 15, fourth valve; 16, check valve; 17, thermometer; 18, in-plant circulating cooling water. Detailed implementation manners

[0025] Next, the technical solutions in the embodiments of the present invention will be clearly and completely described in conjunction with the accompanying drawings in the embodiments of the present invention. Obviously, the described embodiments are only a part of the embodiments of the present invention, rather than all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by those of ordinary skill in the art without making creative efforts belong to the scope of protection of the present invention. Embodiment 1

[0026] As Figure 1As shown in the figure, Embodiment 1 of the present application provides a temperature regulation system for a compressed air energy storage chamber, which includes an artificial chamber 1 horizontally arranged underground, a vertical shaft provided at its top, and an air circulation pipeline 5 and a water pipeline 10 arranged inside it. The air inlet and outlet at both ends of the air circulation pipeline 5 are relatively arranged along both sides of the artificial chamber 1. An axial flow fan 6 is provided in the air inlet of the air circulation pipeline 5. The axial flow fan 6 near the air inlets at both ends of the air circulation pipeline 5 can directly suck the air in the artificial chamber, enhancing the initial power of air flow and ensuring that the air quickly enters the air circulation pipeline 5. The length direction of the air circulation pipeline 5 is parallel to the axial direction of the artificial chamber 1. The air circulation pipeline 5 is close to the bottom of the artificial chamber 1 and both ends are bent upward and are each provided with a circular diffuser 2. The air circulation pipeline 5 is arranged along the length direction in the artificial chamber 1, which can maximize the heat exchange area and time between water and air, fully exchange heat to improve the heat exchange effect, and regulate the air temperature in the artificial chamber 1. The diffuser 2 can suck air into the air circulation pipeline 5 or disperse it into the artificial chamber 1 at a uniform speed and direction through a porous or blade structure, avoiding concentrated air flow, ensuring that the air in each area can be effectively heat exchanged, enabling the air in the artificial chamber 1 to circulate evenly, making the air temperature more uniform, and avoiding local high temperature and local low temperature phenomena in the artificial chamber 1. During the energy storage charging and energy release deflation stages in the artificial chamber 1, the temperature and pressure fluctuations in the chamber can be effectively controlled.

[0027] The water pipeline 10 is arranged along the length direction of the vertical shaft and is located inside the artificial chamber 1. The water pipeline 10 is arranged along the vertical shaft, making full use of the internal space of the vertical shaft and the chamber, avoiding additional occupation of external sites and additional excavation, facilitating installation and maintenance, and saving construction costs and time. The water pipeline 10 includes a water inlet pipeline 10-1 and a water outlet pipeline 10-2. The water inlet pipeline 10-1 connects the water outlet of the warm water tank 8 and the water inlet of the in-plant circulating cooling water 18. The water outlet pipeline 10-2 connects the water inlet of the cold water tank 9 and the water return port of the in-plant circulating cooling water 18. A spiral heat exchange tube 7 is provided between the water inlet pipeline 10 and the water outlet pipeline 10. The spiral heat exchange tube 7 is embedded in the air circulation pipeline 5 behind the axial flow fan 6 and is used to exchange heat with the air in the chamber to adjust the temperature of the air in the artificial chamber 1 during charging energy storage and discharging energy release. The air flow velocity behind the axial flow fan 6 is relatively high. The design of the spiral heat exchange tube 7 can make full use of the high-speed air flow to further improve the heat exchange efficiency. The spiral heat exchange tube 7 is in direct contact with the air to achieve rapid heat exchange and at the same time reduce the air flow resistance. Moreover, the spiral heat exchange tube 7 is embedded in the air circulation pipeline 5, which also saves the limited space in the artificial chamber 1. The water inlet pipeline 10-1 of the water pipeline 10 is connected to the water inlet of the in-plant circulating cooling water 18 through the third valve 14, and the water outlet pipeline 10-2 is connected to the water return port of the in-plant circulating cooling water 18 through the fourth valve 15. At the same time, the water inlet pipeline 10-1 of the water pipeline 10 is sequentially connected to the water outlet of the warm water tank 8 through the first valve 12, the check valve 16 and the water pump 11. The warm water passes through the water pump 11 and the check valve 16 in sequence. Among them, the check valve controls the unidirectional flow of water to prevent backflow and prevent the water pump 11 from reversing caused by backflow, thereby effectively protecting the water pump from damage and extending its service life. The water outlet pipeline 10-2 is connected to the water inlet of the cold water tank 9 through the second valve 13. By controlling the water inlet and outlet paths of the water pipeline 10 through valves, the warm water tank 8 and the in-plant circulating cooling water 18 system can be flexibly switched to meet the requirements of different working conditions. The check valve 16 and the water pump 11 ensure stable water flow, prevent backflow, and guarantee the reliability of the system operation.

[0028] By adjusting the temperature of the artificial chamber 1 through the air circulation pipeline 5, the water pipeline 10 and the spiral heat exchange tube 7, the adverse effects on the surrounding rock structure caused by the increase in energy storage density are effectively reduced, thereby ensuring the long-term stability and safety of the rock structure and avoiding potential risks caused by structural instability. At the same time, on the premise of ensuring that the temperature and pressure fluctuations are controllable, the energy storage density of the artificial chamber 1 is increased. This not only improves the energy storage efficiency of the artificial chamber 1, but also reduces the construction volume of the artificial chamber 1, reduces the construction cost, and realizes the maximization of economic benefits.

[0029] Such as Figure 5As shown in the figure, the temperature regulation system further includes a plurality of thermometers 17 near the air inlet of the air circulation pipeline 5. The thermometers 17 are evenly distributed along the circular cross-section of the chamber. Preferably, there are three thermometers 17, with an included angle of 120 degrees between each other. The water pump 11, the axial flow fan 6, the third valve 14 and the thermometers 17 are respectively connected to the controller. The thermometers 17 monitor the temperature in the artificial chamber 1 in real time. The controller adjusts the temperature by controlling the water pump 11, the third valve 14 and the axial flow fan 6, preventing the drastic changes in temperature and pressure caused by the increase in energy storage density, so as to ensure that the air temperature and pressure during the energy storage and inflation and the energy release and deflation in the artificial chamber 1 are always within the safe range, and improving the cycle efficiency of the compressed air energy storage system. At the same time, it can make the temperature in the artificial chamber 1 within the preset temperature range during both the charging energy storage and the discharging energy release stages, thereby reducing the pressure change range in the artificial chamber 1 during the charging energy storage and the discharging energy release stages, and directly reducing the aging rate of the sealing material caused by thermal stress. Embodiment 2

[0030] Based on Embodiment 1, as Figure 2 shown, Embodiment 2 of the present application provides a temperature regulation system for a compressed air energy storage chamber, including an artificial chamber 1 horizontally arranged underground, a vertical shaft provided at its top, and an air circulation pipeline 5 and a water pipeline 10 arranged inside it.

[0031] As Figure 2-3 shown, the air inlets and outlets at both ends of the air circulation pipeline 5 are arranged oppositely along both sides of the artificial chamber 1. An axial flow fan 6 is provided in the air inlet of the air circulation pipeline 5. The axial flow fan 6 near the air inlets at both ends of the air circulation pipeline 5 can directly suck the air in the artificial chamber, enhancing the initial power of air flow and ensuring that the air quickly enters the air circulation pipeline 5. The length direction of the air circulation pipeline 5 is parallel to the axial direction of the artificial chamber 1. The air circulation pipeline 5 is close to the bottom of the artificial chamber 1 and both ends are bent upward to connect to a diverging air branch and main pipeline 4. The shape of the air branch and main pipeline 4 is preferably cross-connected and in a cross shape. The air branch and main pipeline 4 is close to the left and right sides of the artificial chamber 1. The air circulation pipeline 5 is arranged in the artificial chamber 1 along the length direction to maximize the heat exchange area and time between water and air, fully exchange heat to improve the heat exchange effect, and regulate the air temperature in the artificial chamber 1. As Figure 4As shown, air branch and main pipes 4 of the air circulation pipe 5 are arranged at intervals along the length direction, and air branch pipes 3 are provided at the ports of the air branch pipes 3. Circular diffusers 2 are provided at the ports of the air branch pipes 3. The diffusers 2 can suck air into the air circulation pipe 5 or disperse it into the artificial chamber 1 at a uniform speed and direction through a porous or vane structure, avoiding the concentrated flow of air. The diffusive arrangement of the air circulation pipe 5, air branch and main pipes 4, and air branch pipes 3 ensures that the air in each area can be effectively heat-exchanged, enables the uniform circulation of the air in the artificial chamber 1, makes the air temperature more uniform, avoids the phenomena of local high temperature and local low temperature in the artificial chamber 1, and effectively controls the temperature and pressure fluctuations in the chamber during the energy storage and inflation and energy release and deflation stages in the artificial chamber 1.

[0032] As Figure 2 shown, the water pipe 10 is arranged along the length direction of the vertical shaft and is located in the artificial chamber 1. The water pipe 10 is arranged along the vertical shaft, making full use of the internal space of the vertical shaft and the chamber, avoiding additional occupation of external sites and additional excavation, being convenient for installation and maintenance, and saving construction costs and time. The water pipe 10 includes an inlet pipe 10-1 and an outlet pipe 10-2. The inlet pipe 10 is connected to the outlet of the warm water tank 8 and the inlet of the in-plant circulating cooling water 18. The outlet pipe 10 is connected to the inlet of the cold water tank 9 and the return port of the in-plant circulating cooling water 18. A spiral heat exchange tube 7 is provided between the inlet pipe 10-1 and the outlet pipe 10-2. The spiral heat exchange tube 7 is embedded in the air circulation pipe 5 behind the axial flow fan 6 and is used to exchange heat with the air in the chamber to adjust the temperature of the air in the artificial chamber 1 during energy storage and inflation and energy release and deflation. The air flow velocity behind the axial flow fan 6 is relatively high. The design of the spiral heat exchange tube 7 can make full use of the high-speed air flow to further improve the heat exchange efficiency. The spiral heat exchange tube 7 is in direct contact with the air to achieve rapid heat exchange, while reducing the air flow resistance. Moreover, the spiral heat exchange tube 7 is embedded in the air circulation pipe 5, which also saves the limited space in the artificial chamber 1. The inlet pipe 10 of the water pipe 10 is connected to the inlet of the in-plant circulating cooling water 18 through a third valve 14, and the outlet pipe 10 is connected to the return port of the in-plant circulating cooling water 18 through a fourth valve 15. At the same time, the inlet pipe 10-1 of the water pipe 10 is sequentially connected to the outlet of the warm water tank 8 through a first valve 12, a check valve 16, and a water pump 11. The warm water passes through the water pump 11 and the check valve 16 in sequence. Among them, the check valve controls the unidirectional flow of water, preventing backflow and preventing the water pump 11 from reversing caused by backflow, thereby effectively protecting the water pump from damage and extending its service life. The outlet pipe 10-2 is connected to the inlet of the cold water tank 9 through a second valve 13. By controlling the inlet and outlet paths of the water pipe 10 through valves, the warm water tank 8 and the in-plant circulating cooling water 18 system can be flexibly switched to meet the requirements of different working conditions. The check valve 16 and the water pump 11 ensure the stable water flow, prevent backflow, and guarantee the reliability of the system operation.

[0033] The temperature of the artificial chamber 1 is adjusted by exchanging heat through the air circulation pipe 5, the water pipe 10, and the spiral heat exchange pipe 7, effectively reducing the adverse effects on the surrounding rock mass structure due to the increase in energy storage density, thus ensuring the long-term stability and safety of the rock mass structure and avoiding potential risks caused by structural instability. At the same time, on the premise of ensuring that the temperature and pressure fluctuations are controllable, the energy storage density of the artificial chamber 1 is increased, which not only improves the energy storage efficiency of the artificial chamber 1, but also reduces the construction volume of the artificial chamber 1, lowers the construction cost, and realizes the maximization of economic benefits.

[0034] As Figure 5 shown, the temperature regulation system further includes a plurality of thermometers 17 near the air inlet of the air circulation pipe 5. The thermometers 17 are evenly distributed along the circular cross-section of the chamber. Preferably, there are three thermometers 17. The water pump 11, the axial flow fan 6, the third valve 14, and the thermometers 17 are respectively connected to the controller. The thermometers 17 monitor the temperature in the artificial chamber 1 in real time. The controller adjusts the temperature by controlling the water pump 11, the third valve 14, and the axial flow fan 6, preventing violent changes in temperature and pressure caused by the increase in energy storage density, so as to ensure that the air temperature and pressure during the energy storage inflation and energy release deflation of the artificial chamber 1 are always within the safe range, and improving the cycle efficiency of the compressed air energy storage system. At the same time, the temperature of the artificial chamber 1 can be adjusted within the preset temperature range during both the charging energy storage and the discharging energy release stages, thereby narrowing the pressure change range of the artificial chamber 1 during the charging energy storage and discharging energy release stages, and directly reducing the aging speed of the sealing material due to thermal stress.

[0035] The embodiment of the present application further provides a method for operating the temperature regulation system of a compressed air energy storage chamber. As Figure 6 shown, it includes the following steps: S11 Energy storage inflation of the artificial chamber 1: High-pressure air flows into the artificial chamber 1.

[0036] S12 Water inlet of the water pipe 10: Open the third valve 14 and the fourth valve 15, close the first valve 12 and the second valve 13, and the water pump 11 is in a stopped state. The chilled water in the in-plant circulating cooling water 18 is transported to the spiral heat exchange pipe 7 through the water pipe 10.

[0037] S13 Heat exchange process: Start the axial flow fan 6, suck the air in the artificial chamber 1 into the air circulation pipe 5 through the circular diffuser 2 and the air branch pipe 3. The chilled water flows in the spiral heat exchange pipe 7 and exchanges heat with the air in the air circulation pipe 5. After the chilled water is heated, it flows into the return water of the in-plant circulating cooling water 18. At the same time, the air cools down after passing through the spiral heat exchange pipe 7.

[0038] S14 Air circulation and temperature regulation: The cooled air flows through the air circulation pipeline 5 to the air main and branch pipeline 4 on the left side of the artificial chamber 1, and then is evenly distributed into the artificial chamber 1 through the air branch pipeline 3 and the circular diffuser 2 to absorb the heat generated during the inflation and compression process of the artificial chamber 1.

[0039] S15 Control air temperature: Monitor the air temperature in the artificial chamber 1 through the thermometer 17. When the average temperature exceeds the preset temperature of the controller, the controller increases the opening degree of the third valve 14 and the power of the axial flow fan 6 to increase the cold water and air flow rates. When the average temperature is lower than the preset temperature of the controller, the controller reduces the opening degree of the third valve 14 and the power of the axial flow fan 6 to reduce the cold water and air flow rates, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

[0040] Specific working process of the temperature regulation system: When the artificial chamber 1 is in the energy storage and inflation stage, high-pressure air at about 40 °C is filled into the artificial chamber 1. Close the first valve 12 and the second valve 13, open the third valve 14 and the fourth valve 15, and the water pump 11 is in the shutdown state. The inlet water temperature of the in-plant circulating cooling water 18 is about 25 °C and flows through the water pipeline 10 arranged in the shaft into the spiral heat exchange tube 7 arranged in the air circulation pipeline 5 of the artificial chamber 1. The cold water at about 35 °C at the outlet of the spiral heat exchange tube 7 flows through the water pipeline 10 arranged in the shaft into the return water of the in-plant circulating cooling water 18 arranged on the ground. At the same time, turn on the axial flow fan 6. The air at about 40 °C at the right end of the artificial chamber 1 is inhaled into the air main and branch pipeline 4 through the circular diffuser 2 and the air branch pipeline 3, and converges into the air circulation pipeline 5. The air is cooled after passing through the spiral heat exchange tube 7 arranged in the circulating main pipeline. The cold air at about 30 °C flows through the air circulation pipeline 5 to the air main and branch pipeline 4 arranged on the left side of the artificial chamber 1, and then is evenly distributed to each air branch pipeline 3 through the air main and branch pipeline 4, and finally flows out from the circular diffuser 2. The cold air gradually diffuses in the artificial chamber 1 and absorbs the heat generated during the inflation and compression process in the artificial chamber 1. When the average value of the air temperature in the artificial chamber 1 measured by the three thermometers 17 exceeds 40 °C, the opening degree of the third valve 14 should be increased to increase the cold water flow rate, and at the same time, the power of the axial flow fan 6 should be increased to increase the in-chamber circulating air flow rate. When the average value of the air temperature in the artificial chamber 1 measured by the three thermometers 17 is lower than 40 °C, the opening degree of the third valve 14 should be reduced to reduce the cold water flow rate, and at the same time, the power of the axial flow fan 6 should be reduced to reduce the in-chamber circulating air flow rate in the artificial chamber 1. Finally, the heat generated during the inflation and compression process in the artificial chamber 1 is taken away by the in-plant circulating cooling water 18, and the overall average temperature in the artificial chamber 1 is adjusted and controlled to remain about 40 °C unchanged, thereby also reducing the pressure rise amplitude during the energy storage and inflation process of the artificial chamber 1.

[0041] As Figure 7 shown, the method of the temperature regulation system further includes the following steps: S21 Energy release and air discharge from the artificial chamber 1: High-pressure air flows out of the artificial chamber 1.

[0042] S22 Water inlet to the water pipe 10: Open the first valve 12 and the second valve 13, close the third valve 14 and the fourth valve 15, start the water pump 11, and convey the warm water in the warm water tank 8 to the spiral heat exchange tube 7 through the water pipe 10.

[0043] S23 Heat exchange process: Start the axial flow fan 6, suck the air in the artificial chamber 1 into the air circulation pipe 5 through the circular diffuser 2 and the air branch pipe 3. The warm water flows in the spiral heat exchange tube 7 and exchanges heat with the air in the air circulation pipe. After the warm water cools down, it flows into the cold water tank 9. At the same time, the air is heated after passing through the spiral heat exchange tube 7.

[0044] S24 Air circulation and temperature regulation: The heated air flows through the air circulation pipe to the air main branch pipe 4 on the left side of the artificial chamber 1, and then is evenly distributed into the artificial chamber 1 through the air branch pipe 3 and the circular diffuser 2 to make up for the heat lost during the air discharge and expansion process of the artificial chamber 1.

[0045] S25 Control of air temperature: Monitor the air temperature in the artificial chamber 1 through the thermometer 17. When the average temperature is lower than the preset temperature of the controller, the controller increases the power of the water pump 11 and the axial flow fan 6 to increase the warm water and air flow rates. When the average temperature exceeds the preset temperature of the controller, the controller reduces the power of the water pump 11 and the axial flow fan 6 to decrease the warm water and air flow rates, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

[0046] Specific working process of the temperature regulation system: When the artificial chamber 1 is in the energy release and air exhaust stage, high-pressure air at about 40°C flows out of the artificial chamber 1. Open the first valve 12 and the second valve 13, close the third valve 14 and the fourth valve 15, and start the water pump 11. The warm water at about 95°C in the warm water tank 8 arranged on the ground flows into the spiral heat exchange tube 7 arranged in the air circulation pipeline of the artificial chamber 1 through the water pipeline 10 arranged in the shaft. The cold water at about 50°C at the outlet of the spiral heat exchange tube 7 flows into the cold water tank 9 arranged on the ground through the water pipeline 10 arranged in the shaft. At the same time, turn on the axial flow fan 6. The air at about 40°C at the right end in the artificial chamber 1 is sucked into the air branch main pipeline 4 through the circular diffuser 2 and the air branch pipe 3, converges into the air circulation pipeline. After the air passes through the spiral heat exchange tube 7 arranged in the circulation main pipeline, it is heated and raised in temperature. The hot air at about 60°C flows through the air circulation pipeline 5 to the air branch main pipeline 4 arranged on the left side of the artificial chamber 1, and then is evenly distributed to each air branch pipe 3 through the air branch main pipeline 4, and finally flows out from the circular diffuser 2. The hot air gradually diffuses in the artificial chamber 1 to make up for the heat lost during the air release and expansion process in the artificial chamber 1. When the average air temperature in the artificial chamber 1 measured by the three thermometers 17 is lower than 40°C, the power of the water pump 11 should be increased to increase the warm water flow rate, and at the same time, the power of the axial flow fan 6 should be increased to increase the circulating air flow rate in the chamber. When the average air temperature in the artificial chamber 1 measured by the three thermometers 17 exceeds 40°C, the power of the water pump 11 should be decreased to reduce the warm water flow rate, and at the same time, the power of the axial flow fan 6 should be decreased to reduce the circulating air flow rate in the artificial chamber 1. Finally, the heat carried by the warm water in the warm water tank 8 makes up for the heat lost during the air release and expansion process in the artificial chamber 1, adjusts and controls the overall average temperature in the artificial chamber 1 to remain about 40°C unchanged, thereby also reducing the pressure drop amplitude during the energy release and air exhaust process of the artificial chamber 1.

[0047] The operation method of the temperature regulation system provided by the present invention stores heat due to the circulation surplus of the warm water in the warm water tank during the operation of the compressed air energy storage system. It can effectively utilize the system circulation to heat the air cooled in the chamber during energy release with the surplus heat in the warm water tank, realizing the efficient recovery and reuse of energy, thereby improving the cycle efficiency of the compressed air energy storage system and reducing energy loss.

[0048] In the description of this specification, the description referring to terms such as "one embodiment", "example", "specific example", etc. means that the specific features, structures, materials or characteristics described in connection with the embodiment or example are included in at least one embodiment or example of the present invention. In this specification, the schematic representations of the above terms do not necessarily refer to the same embodiment or example. Moreover, the specific features, structures, materials or characteristics described can be combined in a suitable manner in any one or more embodiments or examples.

[0049] The preferred embodiments of the present invention disclosed above are only used to help illustrate the present invention. The preferred embodiments do not describe all the details in detail, nor do they limit the invention to the specific embodiments described. Obviously, many modifications and variations can be made according to the content of this specification. These embodiments are selected and specifically described in this specification to better explain the principles and practical applications of the present invention, so that those skilled in the art can well understand and utilize the present invention. The present invention is only limited by the claims and their full scope and equivalents.

Claims

1. A temperature regulation system for a compressed air energy storage chamber, comprising an artificial chamber (1) horizontally arranged underground and a vertical shaft provided at its top, characterized in that: It also includes an air circulation pipeline (5) and a water pipeline (10) arranged in the artificial chamber (1). The air inlet and air outlet at both ends of the air circulation pipeline (5) are relatively arranged along both sides of the artificial chamber (1). An axial flow fan (6) is provided in the air inlet of the air circulation pipeline (5). The water pipeline (10) is arranged along the length direction of the vertical shaft and is arranged in the artificial chamber (1). The water pipeline (10) includes a water inlet pipeline (10-1) and a water outlet pipeline (10-2). The water inlet pipeline (10-1) communicates with the water outlet of the warm water tank (8) and the water inlet of the in-plant circulating cooling water (18). The water outlet pipeline (10-2) communicates with the water inlet of the cold water tank (9) and the water return port of the in-plant circulating cooling water (18). A spiral heat exchange tube (7) is provided between the water inlet pipeline (10-1) and the water outlet pipeline (10-2). The spiral heat exchange tube (7) is embedded in the air circulation pipeline (5) behind the axial flow fan (6) for exchanging heat with the air in the chamber to adjust the temperature of the air in the artificial chamber (1) during the charging energy storage and discharging energy release processes.

2. The temperature regulation system according to claim 1, wherein: The length direction of the air circulation pipeline (5) is parallel to the axial direction of the artificial chamber (1). The air circulation pipeline (5) is close to the bottom of the artificial chamber (1) and bends upward at both ends to communicate with the diverging-shaped air main and branch pipelines (4). The air main and branch pipelines (4) are close to the left and right sides of the artificial chamber (1).

3. The temperature regulation system according to claim 2, wherein: Air branch pipes (3) are arranged at intervals in the length direction of the air main and branch pipelines (4) of the air circulation pipeline (5). Circular diffusers (2) are provided at the ports of the air branch pipes (3).

4. The temperature regulation system according to claim 1, wherein: The water inlet pipeline (10-1) of the water pipeline (10) communicates with the water inlet of the in-plant circulating cooling water (18) through a third valve (14). The water outlet pipeline (10-2) communicates with the water return port of the in-plant circulating cooling water (18) through a fourth valve (15).

5. The temperature regulation system according to claim 4, characterized in that: The water inlet pipeline (10-1) of the water pipeline (10) communicates with the water outlet of the warm water tank (8) through a first valve (12), a check valve (16) and a water pump (11) in sequence. The water outlet pipeline (10-2) communicates with the water inlet of the cold water tank (9) through a second valve (13).

6. The temperature regulation system according to claim 1, characterized in that: It also includes a number of thermometers (17) near the air inlet of the air circulation pipeline (5). The thermometers (17) are evenly distributed along the circular cross-section of the chamber.

7. The temperature regulation system according to claim 6, characterized in that: The water pump (11), the axial flow fan (6), the third valve (14) and the thermometer (17) are respectively connected to a controller.

8. A method for operating a temperature regulation system of a compressed air energy storage chamber according to any one of claims 1-7, characterized in that: It includes the following steps: S11 Energy storage and charging of the artificial chamber (1): High-pressure air flows into the artificial chamber (1). S12 Water inlet of the water pipeline (10): Open the third valve (14) and the fourth valve (15), close the first valve (12) and the second valve (13), and the water pump (11) is in a stopped state. The cold water in the in-plant circulating cooling water (18) is transported to the spiral heat exchange tube (7) through the water pipeline (10). S13 Heat exchange process: Start the axial flow fan (6), suck the air in the artificial chamber (1) into the air circulation pipeline (5) through the circular diffuser (2) and the air branch pipe (3). The cold water flows in the spiral heat exchange pipe (7) and exchanges heat with the air in the air circulation pipeline (5). After the cold water is heated, it flows into the return water of the in-plant circulating cooling water (18). At the same time, the air is cooled after passing through the spiral heat exchange pipe (7). S14 Air circulation and temperature regulation: The cooled air flows through the air circulation pipeline (5) to the air main branch pipe (4) on the left side of the artificial chamber (1), and then is evenly distributed into the artificial chamber (1) through the air branch pipe (3) and the circular diffuser (2) to absorb the heat generated during the inflation and compression process of the artificial chamber (1). S15 Control the air temperature in the artificial chamber (1): Monitor the air temperature in the artificial chamber (1) through the thermometer (17). When the average temperature exceeds the preset temperature of the controller, the controller increases the opening of the third valve (14) and the power of the axial flow fan (6) to increase the cold water and air flow rates. When the average temperature is lower than the preset temperature of the controller, the controller reduces the opening of the third valve (14) and the power of the axial flow fan (6) to reduce the cold water and air flow rates, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

9. The method for operating a temperature control system according to claim 8, wherein: It also includes the following steps: S21 Energy release and air discharge in the artificial chamber (1): High-pressure air flows out of the artificial chamber (1). S22 Water inlet of the water pipeline (10): Open the first valve (12) and the second valve (13), close the third valve (14) and the fourth valve (15), start the water pump (11), and transport the warm water in the warm water tank (8) to the spiral heat exchange pipe (7) through the water pipeline (10). S23 Heat exchange process: Start the axial flow fan (6), suck the air in the artificial chamber (1) into the air circulation pipeline (5) through the circular diffuser (2) and the air branch pipe (3). The warm water flows in the spiral heat exchange pipe (7) and exchanges heat with the air in the air circulation pipeline (5). After the warm water is cooled, it flows into the cold water tank (9). At the same time, the air is heated after passing through the spiral heat exchange pipe (7). S24 Air circulation and temperature regulation: The heated air flows through the air circulation pipeline (5) to the air main branch pipe (4) on the left side of the artificial chamber (1), and then is evenly distributed into the artificial chamber (1) through the air branch pipe (3) and the circular diffuser (2) to make up for the heat lost during the air discharge and expansion process of the artificial chamber (1). S25 Control the air temperature in the artificial chamber (1): Monitor the air temperature in the artificial chamber (1) through the thermometer (17). When the average temperature is lower than the preset temperature of the controller, the controller increases the power of the water pump (11) and the axial flow fan (6) to increase the warm water and air flow rates. When the average temperature exceeds the preset temperature of the controller, the controller reduces the power of the water pump (11) and the axial flow fan (6) to reduce the warm water and air flow rates, so as to maintain the average air temperature in the chamber at the preset temperature of the controller.

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