Underground compressed air energy storage cycle test system and test method thereof

Abstract

The invention discloses an underground compressed air energy storage cycle test system and a test method thereof, and the system comprises a triaxial ground stress loading assembly, a model box, a heat exchanger assembly, a pressurization assembly and a chamber. The model box is arranged in the triaxial ground stress loading assembly; the heat exchanger assembly comprises a heat exchanger outer unit and a heat exchanger inner unit, the heat exchanger inner unit is arranged in the model box, and the heat exchanger outer unit communicates with the chamber; the chamber is arranged in the model box and further communicates with the pressurizing assembly. A surrounding rock material layer is further filled in the model box and outside the chamber, and the volume of the accommodating cavity in the model box is adjustable; the chamber comprises a cylindrical lining, a first flange plate and a second flange plate, the first flange plate and the second flange plate are arranged at the two ends of the cylindrical lining, an air bag is arranged in the cylindrical lining, and the heat exchanger inner unit is arranged in the air bag. The heat exchanger indoor unit and the air bag are communicated with the corresponding heat exchanger outdoor unit and the pressurizing assembly through the corresponding through channels in the second flange plate respectively. The invention aims to improve the test accuracy.

Description

Technical Field

[0001] The present invention relates to the technical field of compressed air energy storage, and in particular to an underground compressed air energy storage cycle test system and a test method thereof. Background Art

[0002] At present, compressed air energy storage technology uses air as a medium to achieve energy storage and release. Among them, underground lined chamber gas storage has largely gotten rid of the dependence of compressed gas energy storage power stations on special geological conditions, and has the advantages of long life, large scale, low cost, environmental friendliness and easy maintenance. Unlike traditional non-internal pressure underground projects that bear static loads, gas storage chambers will be subjected to the cyclic expansion load of high-pressure air for a long time during their service life, accompanied by repeated temperature rises and falls (10℃~80℃ or a larger temperature range), that is, they are subjected to temperature and pressure cycle loads. Temperature and pressure cycle is the main cause of problems such as lining rupture, air leakage, and surrounding rock instability in underground compressed gas energy storage chambers. The mechanical response and failure law of underground lined chamber gas storage under temperature and pressure cycle loads can provide a reference for the evaluation of the ultimate air pressure of gas storage reservoirs and the structural safety design, which is of great significance for the large-scale construction of compressed gas energy storage power stations.

[0003] The existing invention patent with patent publication number CN116519489A discloses a model test device and method for simulating deformation and destruction of surrounding rocks of compressed gas energy storage reservoirs. The device simulates the surrounding rock structure by filling similar materials in a geological physical model box, and repeatedly charges and discharges gas to a gas receiving module through a gas supply module, thereby realizing the simulation of the charging and discharging cycle of compressed gas energy storage, and intuitively monitoring the deformation of the surrounding rock (through camera video acquisition), and obtaining the deformation law of the surrounding rock under the charging and discharging cycle; while the physical model box is only used as a filling container for surrounding rock simulation materials, and has no triaxial ground stress loading function, and cannot realize the operation simulation of the compressed gas energy storage chamber under different ground stresses (different burial depths) conditions, and thus cannot obtain high-precision experimental data, so that it cannot be effectively applied. Summary of the invention

[0004] The main purpose of the present invention is to provide an underground compressed gas energy storage cycle test system and a test method thereof, aiming to solve the technical problem that the data obtained by the existing simulation test device is not accurate enough.

[0005] To achieve the above-mentioned object, the present invention provides an underground compressed gas energy storage cycle test system, the system comprising a triaxial ground stress loading component, a model box, a heat exchanger component, a pressurizing component and a chamber;

[0006] The model box is arranged in a triaxial geostress loading assembly;

[0007] The heat exchanger assembly includes an external heat exchanger and an internal heat exchanger, the internal heat exchanger is arranged in the model box, and the external heat exchanger is communicated with the chamber;

[0008] The chamber is arranged in the model box and is also connected to a pressurizing component, and the pressurizing component is used to compress air to store energy in the chamber;

[0009] The model box and the cave chamber are also filled with surrounding rock material layers, and the volume of the accommodating cavity in the model box is adjustable;

[0010] The triaxial geostress loading assembly is used to apply a preset directional stress to the chamber through the model box to simulate the stress of the chamber;

[0011] The chamber comprises a cylindrical lining and a first flange and a second flange arranged at both ends of the cylindrical lining, an air bag is arranged in the cylindrical lining, and the heat exchanger internal machine is placed in the air bag;

[0012] The heat exchanger internal unit and the air bag are respectively connected with the corresponding heat exchanger external unit and the pressurizing component through the corresponding through-channels in the second flange;

[0013] The two ends of the cylindrical lining are respectively installed in the corresponding slots of the first flange and the second flange, and the thickness of the cylindrical lining is smaller than the slot gap between the first flange and the second flange.

[0014] Optionally, the pressurizing component includes an air compressor and a pressure control component, wherein the air compressor is used to pressurize the air, and the pressure control component is used to adjust the pressure of the pressurized air to control the pressure of the air entering the chamber.

[0015] Optionally, the heat exchanger internal unit is connected to the heat exchanger external unit via a heat exchange pipe, and the heat exchange pipe passes through the second flange.

[0016] Optionally, the heat exchanger assembly and the pressurizing assembly are also connected to a control console respectively.

[0017] Optionally, the first flange and the second flange are respectively fixedly connected to corresponding surfaces in the model box.

[0018] Optionally, a through channel sleeve in the second flange is provided with a gas charging and discharging interface, and the gas charging and discharging interface is used to be connected to a corresponding pipeline of the pressurizing component.

[0019] Optionally, the cylindrical lining is cast using a lining casting mould.

[0020] Optionally, a plurality of temperature sensors and circumferential and radial pressure sensing patches are arranged on the outer surface of the cylindrical lining; and a plurality of surrounding rock pressure sensors and temperature sensors are buried in the surrounding rock material layer along soil layers of different depths.

[0021] In addition, in order to achieve the above-mentioned purpose, the present invention also provides an experimental method for an underground compressed gas energy storage cycle test system, the experimental method for an underground compressed gas energy storage cycle test system is applied to any of the above-mentioned underground compressed gas energy storage cycle test systems, and the method comprises the following steps:

[0022] Step 1: The pressure and temperature sensors of the inner wall of the lining are collected and transmitted to the control console, so that the control console controls the air compressor to adjust the inflation rate and controls the heat exchanger to adjust the air temperature inside the airbag to the preset value according to the difference between the preset value and the collected value, and starts the air compressor and the heat exchanger based on the corresponding parameters until the real-time air pressure inside the airbag reaches the first preset pressure P1, and then stops inflating the airbag;

[0023] Step 2: After the inflation is completed, the inflation and deflation valves are tightly closed, and the air is retained in the lining, which means that the air storage control is started;

[0024] Step 3, when the gas storage control reaches the first preset time t1, obtain the data of the air pressure sensor in the cylindrical lining, and open the exhaust valve until the air pressure in the cylindrical lining reaches the second preset pressure P2, and then close the exhaust valve;

[0025] Step 4: After the exhaust valve is closed for a second preset time t2, execute step 1 and record the number of cycles.

[0026] Optionally, in step 2, if the rate of decrease of the air pressure in the lining is ≥WMPa / s, the leakage warning of the console is triggered and displayed, and the gas storage control continues, where W is the preset leakage warning value of the console.

[0027] Beneficial effects:

[0028] (1) The underground compressed air energy storage cycle test system of the present invention sets a reasonable gap between the flange slots for installing the reinforced concrete lining, and reserves space for the expansion and deformation of the lining, so that the excessive internal pressure load is borne by the flange and the model box, avoiding the lining and the model box from being locked tightly, that is, a non-fastening and locking lining installation and fixing method is adopted, which reserves a reasonable space for the expansion and deformation of the lining, reduces the air internal pressure load sharing error, and improves the test accuracy. And the highly visualized model box design is convenient for directly observing the deformation of the surrounding rock. And the heat exchanger function is added to realize on-demand opening, so that the air compression heat recovery of the actual compressed air energy storage power station can be simulated, and the real temperature in the chamber can be restored at the same time, further increasing the reliability of the results of the temperature and pressure cycle test.

[0029] (2) In the experimental method of the underground compressed gas energy storage cycle test system, more forms of filling and discharging are achieved through the filling and discharging modes controlled by flow and pressure, which can simulate the mechanical and temperature responses of the gas storage chamber under more working conditions; and a leakage warning function is added, so that the operator can detect gas storage leakage failures in time, realizing the intelligence and safety of the test. BRIEF DESCRIPTION OF THE DRAWINGS

[0030] Figure 1 It is a structural schematic diagram of an embodiment of an underground compressed gas energy storage cycle test system of the present invention;

[0031] Figure 2 for Figure 1 A detailed structural diagram of the chamber in FIG.

[0032] Figure 3 This is a schematic diagram of the lining casting mold;

[0033] Figure 4 Schematic diagram of the structure of the cylindrical lining after pouring.

[0034] Figure 5 The present invention provides a simplified flow chart of the temperature-pressure cycle test logic of an experimental method for an underground compressed gas energy storage cycle test system.

[0035] Description of Figure Numbers:

[0036] 1 triaxial geostress loading assembly, 2 model box, 3 heat exchanger external unit, 4 air compressor, 5 pressure control component, 7 control console, 8 heat exchanger internal unit, 21 cylindrical lining, 22 air bag, 23 first flange, 24 charging and discharging interface, 25 heat exchange pipeline, 26 second flange

[0037] The realization of the purpose, functional features and advantages of the present invention will be further explained in conjunction with embodiments and with reference to the accompanying drawings. DETAILED DESCRIPTION

[0038] It should be understood that the specific embodiments described herein are only used to explain the present invention, and are not used to limit the present invention.

[0039] See also Figures 1 to 4 The present invention provides an underground compressed gas energy storage cycle test system, the system comprises a triaxial geostress loading component 1, a model box 2, a heat exchanger component, a pressurizing component and a chamber; wherein the model box 2 is arranged in the triaxial geostress loading component 1, the triaxial geostress loading component 1 is a hydraulic cylinder with three axial directions of xyz, such as Figure 1 As shown in the figure, the four surfaces (left surface, right surface, upper surface and rear surface) of the model box 2 are subjected to stress from hydraulic cylinders in three directions. Each hydraulic cylinder is started and stopped by a controller. Preferably, each controller is integrated in a corresponding loading control component.

[0040] The heat exchanger assembly includes a heat exchanger external machine 3 and a heat exchanger internal machine 8, the heat exchanger internal machine 8 is arranged in the model box 2, and the heat exchanger external machine 3 is connected to the cavern; the cavern is arranged in the model box 2 and is respectively connected to the heat exchanger external machine 3 and the pressurizing assembly, and the pressurizing assembly is used to compress air to store energy in the cavern; the inside and outside of the model box 2 are also filled with surrounding rock material layers, and the volume of the accommodating cavity in the model box 2 is adjustable, that is, the change of the volume of the accommodating cavity in the model box 2 is achieved by moving at least one of the left surface, right surface, upper surface, and rear surface of the model box 2. Specifically, the triaxial geostress loading assembly 1 applies preset directional stress to the cavern through the model box 2 and the surrounding rock material layer in turn, thereby simulating the actual force of the cavern.

[0041] At the same time, the chamber includes a cylindrical lining 21 and a first flange 23 and a second flange 26 arranged at both ends of the cylindrical lining 21. An air bag 22 is arranged in the cylindrical lining 21, and the heat exchanger internal machine 8 is placed in the air bag 22; the heat exchanger internal machine 8 and the air bag 22 are respectively connected with the corresponding heat exchanger external machine 3 and the pressurizing component through the corresponding through channels in the second flange 26; and then, by pre-installing the heat exchanger internal machine in the air bag and combining it with the heat exchanger external machine outside the chamber, heat recovery of gas in the gas storage chamber is realized, and cooling is achieved at the same time, and it is connected with the pressurizing component to simulate the mechanics of the gas storage chamber under more working conditions.

[0042] Furthermore, if Figure 2 As shown, the two ends of the cylindrical lining 21 are respectively installed in the corresponding first flange 23 and second flange 26 slots, that is, the cylindrical lining 21 and the flanges at both ends are connected by a snap connection, which avoids the combination of flange and screw in the prior art, so that the space of the screw affects the force and transmission between the surrounding rock layer and the lining during triaxial loading, and reduces the test accuracy. Preferably, the thickness of the cylindrical lining 21 is set to be smaller than the slot gap of the first flange 23 and the second flange 26, so that there is still a small gap between the lining and the external slot after installation, ensuring that the lining can be basically fixed in the flange slot, and there is a small displacement space, so as not to be locked with the front and rear plates of the model box. The setting of this structure will make the air internal pressure expansion force directly borne by the lining, and the model box plate will not share the air expansion load due to the fastening constraint of the flange and the lining, thereby reducing the experimental error.

[0043] Furthermore, the pressurizing component includes an air compressor 4 and a pressure control component 5. The air compressor 4 is used to pressurize the air, and the pressure control component 5 is used to adjust the pressure of the pressurized air to control the air pressure entering the chamber. Preferably, the air compressor 4 is also connected to the control console 7 by electrical signals, and the control console 7 can display and control the pressure range output by the air compressor 4; more preferably, the air pressure range is 0.101-30MPa, and the control accuracy is less than 5‰.

[0044] Furthermore, the heat exchanger internal unit 8 is connected to the heat exchanger external unit 3 through a heat exchange pipe 25, and the heat exchange pipe 25 passes through a second flange 26. Preferably, the temperature range of the heat exchanger assembly is 20-100°C, and the control accuracy is less than 1%. More preferably, the heat exchanger assembly is also connected to the control console 7 by electrical signals, and the temperature control of the heat exchanger assembly can also be achieved through the control console 7, thereby increasing the corresponding experimental data under temperature conditions.

[0045] Furthermore, the first flange 23 and the second flange 26 are fixedly connected to corresponding surfaces in the model box 2 respectively.

[0046] Furthermore, a through channel in the second flange 26 is provided with a charging and discharging interface 24, which is used to connect to the pressure pipeline of the pressurizing component, and an exhaust valve 6 is also connected to the pressure pipeline, and the exhaust valve 6 is used to perform a pressure relief operation after the test is completed.

[0047] Furthermore, in the actual application process, the cylindrical lining 21 is cast using a lining casting mold. Specifically, a chamber lining model is cast according to the test requirements. For example, the outer diameter of the chamber to be designed is 400 mm, the inner diameter is 350 mm, and the casting mold is as follows: Figure 3 As shown, the metal outer wall and inner wall are vertically installed on the base slot to form a hollow cylindrical chamber, and a pre-made steel mesh is placed in the chamber. The steel mesh is installed between the inner and outer walls and is centrally set. Then concrete is poured in the mesh chamber, and then curing and demoulding operations are carried out. The sample-prepared reinforced concrete lining is as follows. Figure 4 As shown in the figure, before the experiment, the uninflated airbag is placed in the lining cavity, and then the lining is installed in the triaxial ground stress model box through the corresponding flange. The flange is fixed to the front and rear panels of the model box through four screw holes, and finally the following is obtained: Figure 2 The chamber structure shown.

[0048] Furthermore, a plurality of temperature sensors and circumferential and radial pressure sensing patches are arranged on the outer surface of the cylindrical lining 21, and a plurality of surrounding rock pressure sensors and temperature sensors are buried along different depths of the surrounding rock material layer. The temperature sensor and the pressure sensing patch are provided to monitor in real time the changes in temperature and pressure on the outer surface of the cylindrical lining 21 and in the surrounding rock material layer during the test. Preferably, corresponding temperature sensors and pressure sensors are also provided on the inner wall of the cylindrical lining 21, the purpose of which is to detect the temperature and pressure conditions in the cylindrical lining 21 in real time. More preferably, the temperature sensors and pressure sensors provided above are both connected to the control console by electrical signals, so that the control console 7 can record the temperature and pressure changes during the entire test process for further control.

[0049] Furthermore, a side of the model box 2 close to the operator is configured to be visualized, thereby enabling more intuitive observation of the deformation of the surrounding rock material layer during the test.

[0050] Furthermore, the surrounding rock material layer is made of sand, gypsum and fly ash in a certain proportion, and the surrounding rock material layer is filled into the model box after the sensor detection equipment is arranged before the specific test, and several surrounding rock pressure and temperature sensors are buried along the soil layers at different depths during filling.

[0051] Furthermore, the system is also provided with a video acquisition component, which is used to capture the changes of the surrounding rock during the test to enhance the visualization of the surrounding rock deformation.

[0052] In addition, in order to achieve the above-mentioned purpose, the present invention also provides an experimental method for an underground compressed gas energy storage cycle test system, the experimental method for an underground compressed gas energy storage cycle test system is applied to any of the above-mentioned underground compressed gas energy storage cycle test systems, and the method comprises the following steps:

[0053] Step 1: Collect the pressure and temperature sensors of the inner wall of the lining and transmit them to the control console, so that the console can control the air compressor to adjust the inflation rate and control the heat exchanger to adjust the air temperature inside the airbag to the preset value according to the difference between the preset value and the collected value, and start the air compressor and the heat exchanger based on the corresponding parameters until the real-time air pressure inside the airbag reaches the first preset pressure P1, and then stop inflating the airbag.

[0054] Specifically, before collecting data on the inner wall of the lining, it is necessary to set the value of the applied ground stress according to the test requirements, that is, to load the lining by starting the triaxial ground stress loading component. For example, set the vertical ground stress value σ0 and the horizontal side pressure coefficient α, and the horizontal ground stress σ = α*σ0. Take the vertical ground stress value σ0 = γgh, where γ is the common soil weight, g is 9.8N / g, and h is the burial depth of the gas storage reservoir. At the same time, take the horizontal side pressure coefficient α = 1. After the value collected by the pressure sensor on the lining surface reaches the preset ground stress value, it means that the ground stress condition has been successfully applied, and the loading cylinder will continue to apply force to maintain the preset ground stress. And preset the corresponding parameters in the pressurization component and the heat exchanger component according to the needs: including inflation mode parameters, deflation mode parameters, gas storage time, cycle interval time, number of cycles, gas storage pressure P1, deflation pressure P2, leakage warning value W. After the settings are completed, start the temperature and pressure cycle test, such as Figure 5 The temperature and pressure cycle test logic is shown. Preferably, all monitoring devices are turned on before the test begins, and the camera is turned on for video acquisition.

[0055] The inflation control is that the console inflates the airbag according to the set gas flow rate, and then collects the pressure and temperature sensors arranged on the inner wall of the lining in real time. After the processing module of the console receives the data, it commands the air compressor to adjust the inflation rate according to the difference between the preset value and the collected value. If the temperature in the chamber is higher than the preset gas storage temperature, the console commands the heat exchanger to adjust the temperature to the preset value. If the air pressure filled into the simulated chamber has reached the preset gas storage pressure P1, the air compressor and the heat exchanger will stop working; otherwise, the inflation will continue.

[0056] Step 2: After inflation is completed, close the inflation and deflation valves, and the air is retained in the lining, i.e., start the gas storage control; if the drop rate of the air pressure in the lining is ≥WMPa / s, the console leakage warning is triggered and displayed, and the gas storage control is continued, where W is the preset leakage warning value of the console.

[0057] Step 3, when the gas storage control reaches the first preset time t1, obtain the data of the air pressure sensor in the cylindrical lining, and open the exhaust valve until the air pressure in the cylindrical lining reaches the second preset pressure P2, and then close the exhaust valve;

[0058] Step 4: After the exhaust valve is closed for the second preset time t2, execute step 1 and record the number of cycles, i.e. start the cycle control. If a leakage warning is triggered, the current cycle number is marked and the original cycle is continued; if the operator manually ends the current cycle, the console records the current cycle number, and in turn commands the heat exchanger and air compressor to be closed, and commands the exhaust device to vent to standard atmospheric pressure at the default (safe) exhaust rate, and then stop.

[0059] Furthermore, after the test loading plan is implemented, the air pressure is unloaded to normal pressure, the device equipment is returned to its original position, and the model is removed. The collected data is exported and processed.

[0060] It should be noted that, in this article, the terms "include", "comprises" or any other variations thereof are intended to cover non-exclusive inclusion, so that a process, method, article or system including a series of elements includes not only those elements, but also other elements not explicitly listed, or also includes elements inherent to such process, method, article or system. In the absence of further restrictions, an element defined by the sentence "comprises a ..." does not exclude the existence of other identical elements in the process, method, article or system including the element.

[0061] The serial numbers of the above embodiments of the present invention are only for description and do not represent the advantages or disadvantages of the embodiments.

[0062] The above are only preferred embodiments of the present invention, and are not intended to limit the patent scope of the present invention. Any equivalent structure or equivalent process transformation made using the contents of the present invention specification and drawings, or directly or indirectly applied in other related technical fields, are also included in the patent protection scope of the present invention.

Claims

1. An underground compressed gas energy storage cycle test system, characterized in that: The system comprises a triaxial geostress loading component (1), a model box (2), a heat exchanger component, a pressurizing component and a chamber; The model box (2) is arranged in the triaxial geostress loading component (1); The heat exchanger assembly comprises an external heat exchanger (3) and an internal heat exchanger (8), wherein the internal heat exchanger (8) is arranged in the model box (2), and the external heat exchanger (3) is communicated with the chamber; The chamber is arranged in the model box (2) and is also connected to a pressurizing component, and the pressurizing component is used to store compressed air energy in the chamber; The model box (2) and the outside of the cave are also filled with surrounding rock material layers, and the volume of the accommodating cavity in the model box (2) is adjustable; The triaxial geostress loading assembly (1) is used to apply a preset directional stress to the chamber through the model box (2) and the surrounding rock material layer to simulate the actual stress of the chamber; The chamber comprises a cylindrical lining (21) and a first flange (23) and a second flange (26) arranged at both ends of the cylindrical lining (21); an air bag (22) is arranged in the cylindrical lining (21), and the heat exchanger internal machine (8) is placed in the air bag (22); The heat exchanger internal unit (8) and the air bag (22) are respectively connected to the corresponding heat exchanger external unit (3) and the pressurizing component through corresponding through-channels in the second flange (26); The two ends of the cylindrical lining (21) are respectively installed in the corresponding first flange (23) and second flange (26) slots, and the thickness of the cylindrical lining (21) is smaller than the slot gap between the first flange (23) and second flange (26).

2. The underground compressed gas energy storage cycle test system according to claim 1, characterized in that: The pressurizing component comprises an air compressor (4) and a pressure control component (5). The air compressor (4) is used to pressurize the air, and the pressure control component (5) is used to adjust the pressure of the pressurized air to control the pressure of the air entering the chamber.

3. The underground compressed gas energy storage cycle test system according to claim 1, characterized in that: The heat exchanger internal unit (8) is connected to the heat exchanger external unit (3) via a heat exchange pipe (25), and the heat exchange pipe (25) passes through a second flange (26).

4. The underground compressed gas energy storage cycle test system according to claim 1, characterized in that: The heat exchanger assembly and the pressurizing assembly are also respectively connected to a control console (7).

5. The underground compressed gas energy storage cycle test system according to claim 1, characterized in that: The first flange (23) and the second flange (26) are respectively fixedly connected to corresponding surfaces in the model box (2).

6. The underground compressed gas energy storage cycle test system according to claim 1, characterized in that: A through channel in the second flange (26) is sleeved with a gas charging and discharging interface (24), and the gas charging and discharging interface (24) is used to be connected to a corresponding pipeline of the pressurizing component.

7. The underground compressed gas energy storage cycle testing system according to any one of claims 1 to 6, characterized in that: The cylindrical lining (21) is cast using a lining casting mould.

8. The underground compressed gas energy storage cycle test system according to claim 7, characterized in that: A plurality of temperature sensors and circumferential and radial pressure sensing patches are arranged on the outer surface of the cylindrical lining (21); and a plurality of surrounding rock pressure sensors and temperature sensors are buried along soil layers at different depths in the surrounding rock material layer.

9. An experimental method for an underground compressed gas energy storage cycle test system, the experimental method for an underground compressed gas energy storage cycle test system is applied to the above-mentioned underground compressed gas energy storage cycle test system, characterized in that: The method The following steps are included: Step 1: The pressure and temperature sensors of the inner wall of the lining are collected and transmitted to the control console, so that the control console controls the air compressor to adjust the inflation rate and controls the heat exchanger to adjust the air temperature inside the airbag to the preset value according to the difference between the preset value and the collected value, and starts the air compressor and the heat exchanger based on the corresponding parameters until the real-time air pressure inside the airbag reaches the first preset pressure P1, and then stops inflating the airbag; Step 2: After the inflation is completed, the inflation and deflation valves are tightly closed, and the air is retained in the lining, which means that the air storage control is started; Step 3, when the gas storage control reaches the first preset time t1, obtain the data of the air pressure sensor in the cylindrical lining, and open the exhaust valve until the air pressure in the cylindrical lining reaches the second preset pressure P2, and then close the exhaust valve; Step 4: After the exhaust valve is closed for a second preset time t2, execute step 1 and record the number of cycles.

10. The experimental method of the underground compressed gas energy storage cycle test system according to claim 9, characterized in that: In step 2, if the rate of decrease of the air pressure in the lining is ≥WMPa / s, the leakage warning of the console is triggered and displayed, and the gas storage control continues, where W is the preset leakage warning value of the console.

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