Method and equipment for testing air permeability performance of sealing material of compressed air energy storage chamber

Abstract

The invention relates to the field of compressed air energy storage underground chambers, in particular to a compressed air energy storage chamber sealing material gas permeation performance testing method and equipment, and the equipment comprises a pressure chamber, a high pressure gas source, a gas inlet device, a gas pressure sensor and a connecting pipeline. The pressure chamber is used for accommodating a test sample and providing a good closed environment for a detection process; the high-pressure gas source and the gas inlet device are responsible for providing high-pressure gas and controlling the gas pressure of the pressure bin, and the temperature of the bin is controllable in combination with an electric heating net in a gas inlet pipe of the pressure bin; the pressure chamber comprises a steel shell, a sealing rubber ring, a rubber gasket, a bolt and nut assembly and a heat preservation layer. The air pressure sensor is connected to the tail end of the pressure chamber through a pipeline. A temperature regulation and control function is added, the temperature and pressure alternating working environment of the sealing layer in the using process of the compressed air energy storage chamber can be more comprehensively reduced, the permeability evolution law of the sealing material under the action of multiple factors is tested, and sealing material optimization at the initial stage of gas storage design is facilitated.

Description

Technical Field

[0001] The present invention relates to the field of underground chambers for compressed air energy storage, and particularly to a method and device for testing the gas permeability performance of a sealing material for a compressed air energy storage chamber. Background Art

[0002] Compressed air energy storage has important application value in suppressing the volatility of renewable energy and improving the stability of the power grid. Its core facility, the underground gas storage, usually adopts an artificial chamber structure (such as a salt rock cave, a hard rock chamber or a concrete-lined cavity), and relies on high-performance sealing materials (such as polymer linings, nanocomposites or flexible impermeable membranes) to build an airtight barrier to prevent energy loss and geological safety hazards caused by high-pressure gas leakage.

[0003] However, the underground gas storage faces a complex multi-field coupling environment during actual operation: high pressure, alternating temperature, humidity penetration and dynamic changes in surrounding rock stress, which pose strict requirements on the long-term stability of the sealing material.

[0004] For the gas permeability performance test (hereinafter referred to as the gas permeability performance test) of the sealing material for a compressed air energy storage chamber under a complex multi-field coupling environment, existing detection means are mostly limited to laboratory tests of single environmental parameters, such as the determination of low-temperature static gas permeability or short-term pressure resistance tests, and it is difficult to test the gas permeability performance of the sealing material under the synergistic action of multiple factors, resulting in a significant deviation between the evaluation result and the actual working condition. Summary of the Invention

[0005] The purpose of the present invention is to provide a method and device for testing the gas permeability performance of a sealing material for a compressed air energy storage chamber, which can solve the technical problem that there is a significant deviation in the existing detection means for the gas permeability performance of the sealing material.

[0006] To achieve the above purpose, the present invention provides the following technical solutions:

[0007] The present invention designs a method for testing the gas permeability performance of a sealing material for a compressed air energy storage chamber, including the following steps:

[0008] Install the test sample: Cut a test sample of appropriate size and install it horizontally at the connection of the upper and lower cylinders in the middle of the pressure chamber. The test sample divides the interior of the pressure chamber into upper and lower chambers, and both ends of the test sample are located between double-layer annular rubber gaskets;

[0009] Perform high and low pressure tests in cycles at different temperatures:

[0010] Open the valve, and set multiple temperature values and pressure values on the thermometer and pressure gauge of the air inlet device respectively;

[0011] Open the intake device to pressurize the upper pressure chamber. After the air pressure in the upper pressure chamber reaches the test set value, close the intake device, stop pressurizing, and start the high-pressure holding of the pressure chamber to test the sealing performance of the material under high-pressure conditions;

[0012] After completing the high-pressure holding, open the intake device to relieve the pressure of the pressure chamber. After relieving the pressure to the set pressure value, close the intake device, stop relieving the pressure, and start the low-pressure holding of the pressure chamber to test the sealing performance of the material under low-pressure conditions;

[0013] After completing the low-pressure holding, open the intake device again to pressurize the upper pressure chamber, and repeat the above steps;

[0014] Open the electric heating network in the second connecting pipe to heat the pressure chamber through the electric heating network. After reaching the set temperature value, stop heating;

[0015] Repeat the sealing performance test of the material under high-pressure and low-pressure conditions at different set temperatures to complete the high-low pressure test under different temperature cycles, calculate the air permeability of the test sample material, and record the test results.

[0016] As a preferred solution, when cycling the high-low pressure test at different temperatures, calculate the air permeability of the test sample material through the data change recorded by the air pressure sensor. Then, the calculated permeability coefficient changes with the number of cycles, pressure, and temperature, which can intuitively show the sealing performance of the underground chamber sealing material.

[0017] As a preferred solution, the air permeability calculation formula of the test sample material is as follows,

[0018]

[0019] In the formula, K is the permeability coefficient (m 2 / (s·Pa)), K High is the permeability coefficient under high-pressure conditions, K Low is the permeability coefficient under high-pressure conditions, V is the volume of the lower sealed container of the pressure chamber (m 3 ), L is the material thickness (m), A is the effective permeation area of the material (m 2 ), P High is the pressure of the upper container of the pressure chamber under high-pressure conditions (Pa), P Low is the pressure of the upper container of the pressure chamber under low-pressure conditions (Pa), P(t) is the pressure of the lower container of the pressure chamber after time t (Pa), and t is the permeation time (s).

[0020] As a preferred solution, when installing the test sample, a rubber sealing ring is arranged around the double-layer annular rubber gasket. The rubber sealing ring is installed closely around the rubber gasket. The outer diameter of the double-layer annular rubber gasket is smaller than the inner diameter of the rubber sealing ring, which is used to ensure the sealing performance of the pressure chamber.

[0021] The present invention also designs a test device for the air permeability performance of the sealing material of the compressed air energy storage chamber, including a pressure chamber, an air inlet device, a connecting pipe, and a gas source;

[0022] The pressure chamber includes an upper pressure chamber, a lower pressure chamber, and a bolt and nut assembly connecting the upper pressure chamber and the lower pressure chamber;

[0023] A sealing assembly is installed at the connection between the upper pressure chamber and the lower pressure chamber; the sealing assembly includes a rubber sealing ring and a rubber gasket. The rubber gasket is a double-layer rubber gasket, and the test sample is installed between the double-layer rubber gaskets. The rubber sealing ring is installed around the rubber gasket.

[0024] The top of the upper pressure chamber is connected to the air inlet device. The air inlet device is internally provided with a thermometer and a barometer, which are used to read the current temperature and pressure values of the pressure chamber.

[0025] The connecting pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe is used to connect the gas source and the air inlet device. A valve is connected in series on the first connecting pipe to control the gas flow; the second connecting pipe is used to connect the air inlet device and the pressure chamber. An electric heating grid is installed inside the second connecting pipe to heat the gas coming out of the air inlet device so that the gas is heated to a set temperature value before entering the pressure chamber, and the evolution law of the air permeability performance of the test sample at different temperatures can be tested.

[0026] As a preferred solution, a heat preservation layer is installed on the inner wall of the pressure chamber. The heat preservation layer is a fibrous heat preservation material composed of inorganic minerals, which enables the inside of the pressure chamber to have good heat insulation performance, is used to reduce the influence of temperature change caused by heat loss inside the pressure chamber on the test process, and improves the service life of the pressure chamber.

[0027] Furthermore, the outer diameter of the rubber gasket is smaller than the inner diameter of the rubber sealing ring, which is used to ensure the sealing performance of the pressure chamber.

[0028] Furthermore, a temperature control knob and a pressure control knob are also installed inside the air inlet device. According to the thermometer and the barometer to read the current temperature and pressure state of the pressure chamber, the intake pressure and the set temperature value can be adjusted at any time through the temperature control knob and the pressure control knob on the control panel of the air inlet device.

[0029] As a preferred solution, the bolt-nut assembly is specially made, having anti-corrosion ability and long service life. The two ends of the bolt-nut assembly adopt an asymmetric thread angle design, where the thread angles at both ends of the bolt are different. The asymmetric thread makes the contact surface and the force direction more matched by adjusting the thread angles on both sides, dispersing the load from the high-stress area to a larger contact area, reducing the local stress peak, and enhancing the anti-fatigue performance.

[0030] Advantages of the present invention:

[0031] The present invention provides a method and equipment for testing the gas permeability performance of a sealing material for a compressed air energy storage chamber. The pressure chamber is used to accommodate the test sample, providing a good closed environment for the detection process. The high-pressure gas source and the air inlet device are responsible for providing high-pressure gas and controlling the gas pressure in the pressure chamber. Combined with the electric heating network in the air inlet pipe of the pressure chamber, the temperature of the chamber can be controlled. The air pressure sensor is connected to the end of the pressure chamber through a pipeline.

[0032] During the test process, first open the air inlet device to pressurize the upper pressure chamber. When the air pressure in the upper pressure chamber reaches the test set value, stop pressurizing, keep the pressure in the pressure chamber at high pressure, and test the sealing performance of the material under high-pressure conditions. After completing the high-pressure hold, open the air inlet device to relieve the pressure of the pressure chamber. When the pressure is relieved to the set pressure value, stop relieving the pressure, keep the pressure in the pressure chamber at low pressure, and test the sealing performance of the material under low-pressure conditions. After completing the low-pressure hold, open the air inlet device again to pressurize the upper pressure chamber, and repeat the above steps. Cycle the tests of the sealing performance of the material under high-pressure and low-pressure conditions at different set temperatures to complete the high-low pressure tests under different temperature cycles.

[0033] The present invention incorporates a temperature control function, which can more comprehensively restore the temperature and pressure alternating working environment of the sealing layer during the actual use process in the compressed air energy storage chamber, test the evolution law of the permeation performance of the sealing material under the synergistic action of multiple factors, and facilitate the selection of the sealing material at the initial stage of the gas storage reservoir design. Description of the Drawings

[0034] Figure 1 It is a schematic structural diagram of a full set of test equipment.

[0035] Figure 2 It is Figure 1 The enlarged schematic diagram at position A in

[0036] Figure 3 It is a three-dimensional schematic diagram of the pressure chamber model.

[0037] Figure 4 It is a three-dimensional schematic diagram of the lower pressure chamber model.

[0038] Figure 5 It is a three-dimensional schematic diagram of a special bolt.

[0039] In the figure: 1. Air source; 2. Air pressure sensor; 3. Valve; 4. Air pressure gauge; 5. Thermometer; 6. Temperature control knob; 7. Air pressure control knob; 8. Electric heating grid;

[0040] 9. Upper pressure chamber; 10. Thermal insulation layer; 11. Test sample; 12. Bolt and nut; 13. Rubber sealing ring; 14. Rubber gasket; 15. Lower pressure chamber; 16. Pipe connection port;

[0041] 17. First connecting pipe; 18. Second connecting pipe; 19. Bolt hole; Intake device 20. Specific embodiments

[0042] For a better understanding of the present invention, the present invention will be further described below in conjunction with specific embodiments and the accompanying drawings.

[0043] The present invention provides a method and equipment for testing the gas permeability performance of the sealing material of a compressed air energy storage chamber, specifically including a pressure chamber, a high-pressure air source, an intake device, an air pressure sensor, a connecting pipe, etc. The pressure chamber is used to accommodate the test sample and provide a good closed environment for the detection process; the high-pressure air source and the intake device are responsible for providing high-pressure gas and controlling the gas pressure in the pressure chamber. Combined with the electric heating grid in the intake pipe of the pressure chamber, the temperature of the chamber can be controlled; the pressure chamber includes a steel shell, a sealing rubber ring, a rubber gasket, a bolt and nut assembly, and a thermal insulation layer; a double-layer gasket and a rubber ring are used at the connection of the steel shell to achieve the sealing effect of the equipment; the rubber ring and the rubber gasket are made of polymer materials, corrosion-resistant and aging-resistant. The air pressure sensor is connected to the end of the pressure chamber through a pipe and is used to measure the real-time air pressure. Compared with the existing equipment for detecting the gas permeability performance of the sealing layer, the present invention adds a temperature control function, which can more comprehensively restore the working environment of temperature and pressure alternating in the actual use process of the sealing layer in the compressed air energy storage chamber, test the evolution law of the permeability performance of the sealing material under the synergistic action of multiple factors, and facilitate the optimization of the sealing material in the initial stage of the gas storage reservoir design.

[0044] During the test process, first open the intake device to pressurize the upper pressure chamber. When the air pressure in the upper pressure chamber reaches the test set value, stop pressurizing, keep the high pressure in the pressure chamber, and test the sealing performance of the material under the high pressure state; after completing the high-pressure holding, open the intake device to relieve the pressure of the pressure chamber. After relieving the pressure to the set pressure value, stop relieving the pressure, keep the low pressure in the pressure chamber, and test the sealing performance of the material under the low pressure state; after completing the low-pressure holding, open the intake device again to pressurize the upper pressure chamber, and cycle the above steps; cycle the tests of the sealing performance of the material under the high-pressure and low-pressure states at different set temperatures to complete the high-low pressure tests under different temperature cycles.

[0045] As Figure 1As shown in the figure, the present invention provides a test device for the gas permeability performance of the sealing material of an underground chamber for compressed air energy storage. The test device includes: a pressure chamber, an air inlet device, a connecting pipe, and a high-pressure gas source.

[0046] The pressure chamber includes an upper pressure chamber, a lower pressure chamber, and a bolt and nut assembly connecting the upper pressure chamber and the lower pressure chamber;

[0047] A sealing assembly is installed at the connection between the upper pressure chamber and the lower pressure chamber; the sealing assembly includes a rubber sealing ring and a rubber gasket. The rubber gasket is a double-layer rubber gasket, and the test sample is installed between the double-layer rubber gaskets. The rubber sealing ring is installed on the periphery of the rubber gasket.

[0048] The top end of the upper pressure chamber is connected to the air inlet device. The air inlet device is internally provided with a thermometer and a barometer for reading the current temperature and pressure values of the pressure chamber.

[0049] The connecting pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe is used to connect the gas source and the air inlet device, and a valve is connected in series on the first connecting pipe to control the gas flow; the second connecting pipe is used to connect the air inlet device and the pressure chamber, and an electric heating grid is installed inside the second connecting pipe to heat the gas coming out of the air inlet device so that the gas is heated to a set temperature value before entering the pressure chamber, and the evolution law of the gas permeability performance of the test sample at different temperatures is tested.

[0050] The pressure chamber is used to install the test sample; the pressure chamber includes two parts, an upper pressure chamber 9 and a lower pressure chamber 15. When manufacturing the pressure chamber, it is integrally formed in upper and lower parts. The top end of the pressure chamber is connected to the air inlet device 20. The air inlet device 20 is internally provided with a temperature sensor and a pressure sensor; a sealing assembly is installed in the middle of the pressure chamber. The sealing assembly includes a rubber sealing ring 13 at the connection between the upper and lower parts of the pressure chamber and a rubber gasket 14 in contact with the test sample; a heat preservation layer 11 formed by heat preservation materials is installed inside the pressure chamber, and a special bolt and nut assembly is arranged in a ring outside the pressure chamber. The pressure chamber includes a steel shell, a sealing rubber ring, a rubber gasket, a bolt and nut assembly, and a heat preservation layer; a double-layer gasket plus a rubber ring is used at the connection of the steel shell to achieve the sealing effect of the device; the rubber ring and the rubber gasket are made of polymer materials, corrosion-resistant and aging-resistant. The pressure sensor 2 is connected to the end of the pressure chamber through a pipeline for measuring the real-time air pressure.

[0051] The thermal insulation layer 10 is located on the inner wall of the pressure chamber and is used to maintain the internal temperature of the pressure chamber. The thermal insulation layer 10 is made of a fibrous thermal insulation material composed of inorganic minerals, enabling the interior of the pressure chamber to have good heat insulation performance, effectively reducing the impact of temperature changes caused by internal heat loss on the testing process, and simultaneously enhancing the service life of the pressure chamber.

[0052] When the pressure chamber is sealed, a double-layer annular rubber gasket 14 is used inside. The double-layer annular rubber gasket 14 includes one gasket above and below the specimen. An annular rubber seal ring 13 is installed on the periphery of the double-layer annular rubber gasket 14. The double-layer annular rubber gasket 14 is respectively installed at the connection of the upper and lower pressure chambers, and the test sample 11 is fixed in the middle of the upper and lower double-layer annular rubber gaskets 14.

[0053] The test sample 11 is installed in the middle of the double-layer annular rubber gasket 14. A rubber seal ring 13 is installed outside the rubber gasket 14. The outer diameter of the rubber gasket 14 is slightly smaller than the inner diameter of the rubber seal ring 13, which is used to ensure the sealing performance of the test device.

[0054] The external connection of the pressure chamber is fixed by a specially designed bolt-nut assembly arranged symmetrically in a ring shape. The upper pressure chamber 9 is connected to the lower pressure chamber 15 through the specially designed bolt-nut 12 assembly. The surface of the specially designed bolt-nut assembly is treated by electroplating, having a certain anti-corrosion ability and extending its service life. The two ends of the bolt-nut assembly adopt an asymmetric thread angle design, that is, the thread angles α at both ends of the bolt are different. The asymmetric thread makes the contact surface match the force direction better by adjusting the thread angles on both sides, dispersing the load from the high-stress area to a larger contact area, thereby reducing the local stress peak value and enhancing the anti-fatigue performance.

[0055] The current temperature state can be read at any time through the temperature sensing device installed in the pressure chamber. The intake pressure and the set temperature value are regulated through a knob on the control panel of the intake device 20. A pressure sensor 2 is installed in the lower pressure chamber 15.

[0056] The connecting pipe includes a first connecting pipe 17 and a second connecting pipe 18. The first connecting pipe 17 is used to connect the high-pressure gas source 1 and the intake device 20. A valve 3 is connected in series in the middle of the first connecting pipe to control the gas flow, enhancing the safety and stability of the equipment. The second connecting pipe 18 is used to connect the intake device 20 and the pressure chamber. An electric heating grid 8 is installed in the middle of the second connecting pipe. The gas coming out of the intake device 20 is heated to the set temperature before entering the pressure chamber, so as to test the evolution law of the permeation performance of the test sample at different temperatures.

[0057] Inside the intake device 20, there is a thermometer 5, a barometer 4, a temperature control knob 6, and a pressure control knob 7. According to the readings of the thermometer and barometer, the current temperature and pressure status of the pressure chamber are obtained, and the intake pressure and set temperature value can be adjusted at any time through the temperature control knob and pressure control knob on the control panel of the intake device.

[0058] The present invention also provides an installation and testing method for the air leakage performance testing equipment of the sealing material for the underground chamber of compressed air energy storage. The method includes the following steps:

[0059] S1. Cleaning and installation of the testing equipment:

[0060] Use a clean rag to clean the stains on the cylinder body of the upper pressure chamber 9, the cylinder body of the lower pressure chamber 15, the rubber gasket 14, and the surface of the rubber sealing ring 13. Cut a test sample 11 of appropriate size and install it horizontally at the connection of the upper and lower cylinder bodies in the middle of the pressure chamber. The test sample divides the pressure chamber into upper and lower chambers, and both ends of the test sample are located between the double-layer annular rubber gaskets 14;

[0061] S2. Installation of the sealing layer:

[0062] Apply a circle of sealant to the bottom edge of the rubber sealing ring 13, then install it closely around the rubber gasket 14 and compact the rubber sealing ring 13 to ensure that the rubber sealing ring 13 is closely attached to the bottom plate of the upper cylinder body; the outer diameter of the rubber gasket 14 is slightly smaller than the inner diameter of the rubber sealing ring 13; this is used to ensure the sealing performance of the pressure chamber;

[0063] S3. Installation of the pressure chamber:

[0064] Align the cylinder body of the upper pressure chamber 9 with the cylinder body of the lower pressure chamber 15, adjust the angle to ensure alignment with the bolt holes 19 of the cylinder body of the lower pressure chamber 15, and connect and fix the cylinder bodies of the upper and lower pressure chambers through the special nut assembly 12; among them, when installing the bolts, tighten the bolts step by step in a diagonal order, and use a torque wrench to tighten them according to the specified torque value to ensure that the tightening force of each bolt is uniform;

[0065] S4. Connecting the pipelines:

[0066] Connect the first connecting pipeline 17 and the second connecting pipeline 18 respectively. The first connecting pipeline 17 connects the air source and the intake device, and the second connecting pipeline 18 connects the intake device and the pressure chamber;

[0067] S5. Conducting high and low pressure tests in cycles at different temperatures:

[0068] In order to reflect the sealing performance of the material under cyclic high and low pressure alternating conditions at different temperatures, high and low pressure tests in cycles are conducted on the material at different temperatures.

[0069] S5.1 Open valve 3 and set multiple temperature values and air pressure values on the thermometer and barometer of the air intake device respectively;

[0070] S5.2 Open the air intake device 20 to pressurize the upper pressure chamber 9. When the air pressure in the upper pressure chamber reaches the test set value, close the air intake device 20, stop pressurizing, start high-pressure holding of the pressure chamber, and conduct a material sealing performance test under high-pressure conditions;

[0071] S5.3 After completing the high-pressure holding, open the air intake device 20 to relieve the pressure of the pressure chamber. After relieving the pressure to the set pressure value, close the air intake device 20, stop relieving the pressure, start low-pressure holding of the pressure chamber, and conduct a material sealing performance test under low-pressure conditions;

[0072] S5.4 After completing the low-pressure holding, open the air intake device 20 again to pressurize the upper pressure chamber 9, and repeat the above steps;

[0073] S5.5 Open the electric heating network in the second connecting pipe, heat the pressure chamber through the electric heating network, and stop heating after reaching the set temperature value;

[0074] S5.6 Repeat the material sealing performance test under high-pressure and low-pressure conditions at different set temperatures, complete the high-low pressure test under different temperature cycles, calculate the air permeability of the test sample material, and record the test results.

[0075] When cycling the high-low pressure test at different temperatures, calculate the air permeability of the test sample material through the recorded data changes of the air pressure sensor. Then, the calculated permeability coefficient changes with the number of cycles, pressure, and temperature, and can intuitively show the sealing performance of the underground chamber sealing material.

[0076] The air permeability calculation formula of the test sample material is as follows.

[0077] Air permeability, that is, sealing performance. Air permeability calculation is used to verify whether the sealing performance of the pressure chamber meets the requirements when cycling the high-low pressure test at different temperatures.

[0078]

[0079]

[0080] In the formula, K is the permeability coefficient (m 2 / (s·Pa)), K High is the permeability coefficient under high-pressure conditions, K Low is the permeability coefficient under high-pressure conditions, V is the volume of the lower closed container of the pressure chamber (m 3 ), L is the material thickness (m), A is the effective permeation area of the material (m 2), P High is the pressure (Pa) of the upper container of the pressure chamber under high pressure, P Low is the pressure (Pa) of the upper container of the pressure chamber under low pressure, P(t) is the pressure (Pa) of the lower container of the pressure chamber after time t, and t is the penetration time (s). The permeability coefficient K represents the air permeability of the sealing material. The smaller the permeability coefficient, the better the sealing effect.

[0081] It should be understood that the specific order or hierarchy of steps in the processes disclosed in this invention are examples of exemplary methods. Based on design preferences, it should be understood that the specific order or hierarchy of steps in the processes can be rearranged without departing from the scope of this disclosure. The appended method claims present the elements of the various steps in an exemplary order and are not intended to be limited to the specific order or hierarchy recited.

[0082] The above-described embodiments merely represent several implementation manners of the present invention, and the description thereof is relatively specific and detailed, but it should not be construed as a limitation to the scope of the patent of the present invention. It should be noted that for those of ordinary skill in the art, without departing from the concept of the present invention, several variations and improvements can still be made, and these all belong to the protection scope of the present invention. Therefore, the protection scope of the patent of the present invention shall be subject to the appended claims.

Claims

1. A test method for the gas permeability performance of the sealing material of a compressed air energy storage chamber, characterized in that, It includes the following steps: Install the test sample: Cut a test sample of appropriate size and install it horizontally at the connection of the upper and lower cylinders in the middle of the pressure chamber. The test sample divides the interior of the pressure chamber into upper and lower chambers, and both ends of the test sample are located between double-layer annular rubber gaskets; Conduct high and low pressure tests cyclically at different temperatures: Open the valve and set multiple temperature values and pressure values on the thermometer and barometer of the air intake device respectively; Open the air intake device to pressurize the upper pressure chamber. When the air pressure in the upper pressure chamber reaches the test set value, close the air intake device to stop pressurization, start high pressure holding for the pressure chamber, and conduct material sealing performance tests under high pressure; After completing high pressure holding, open the air intake device to relieve the pressure of the pressure chamber. After relieving the pressure to the set pressure value, close the air intake device to stop pressure relief, start low pressure holding for the pressure chamber, and conduct material sealing performance tests under low pressure; After completing low pressure holding, open the air intake device again to pressurize the upper pressure chamber, and cycle the above steps; Turn on the electric heating network in the second connecting pipe to heat the pressure chamber through the electric heating network. After reaching the set temperature value, stop heating; Cycle the material sealing performance tests under the above high and low pressure states at different set temperatures, complete the high and low pressure tests under different temperature cycles, calculate the gas permeability of the test sample material, and record the test results.

2. The test method for the gas permeability of the sealing material of a compressed air energy storage chamber according to claim 1, characterized in that, When conducting high and low pressure tests cyclically at different temperatures, calculate the gas permeability of the test sample material through the recorded data changes by the air pressure sensor. Moreover, the calculated permeability coefficient changes with the number of cycles, pressure, and temperature, which can intuitively show the sealing performance of the sealing material for underground chambers.

3. The test method for the gas permeability of the sealing material of a compressed air energy storage chamber according to claim 2, characterized in that, The gas permeability calculation formula of the test sample material is as follows, where K is the permeability coefficient (m 2 / (s·Pa)), K High is the permeability coefficient under high pressure, K Low is the permeability coefficient under high pressure, V is the volume of the sealed container at the lower part of the pressure chamber (m 3 ), L is the material thickness (m), A is the effective permeation area of the material (m 2 ), P High is the pressure of the upper container in the pressure chamber under high pressure (Pa), P Low is the pressure of the upper container in the pressure chamber under low pressure (Pa), P(t) is the pressure of the lower container in the pressure chamber after time t (Pa), and t is the permeation time (s).

4. The test method for the gas permeability of the sealing material of a compressed air energy storage chamber according to claim 1, characterized in that, When installing the test sample, set a rubber sealing ring outside the double-layer annular rubber gasket. The rubber sealing ring is installed closely around the rubber gasket. The outer diameter of the double-layer annular rubber gasket is smaller than the inner diameter of the rubber sealing ring, which is used to ensure the sealing performance of the pressure chamber.

5. A testing device for the air permeability performance of the sealing material of a compressed air energy storage chamber, characterized in that, It includes a pressure chamber, an air intake device, a connecting pipe, and a gas source; The pressure chamber includes an upper pressure chamber, a lower pressure chamber, and a bolt and nut assembly connecting the upper pressure chamber and the lower pressure chamber; A sealing component is installed at the connection of the upper pressure chamber and the lower pressure chamber; the sealing component includes a rubber sealing ring and a rubber gasket. The rubber gasket is a double-layer rubber gasket. The test sample is installed between the double-layer rubber gaskets, and the rubber sealing ring is installed outside the rubber gasket. The top of the upper pressure chamber is connected to the air intake device. The air intake device is internally provided with a thermometer and a barometer for reading the current temperature and pressure values of the pressure chamber. The connecting pipe includes a first connecting pipe and a second connecting pipe. The first connecting pipe is used to connect the gas source and the air intake device. A valve is connected in series on the first connecting pipe to control the flow of gas. The second connecting pipe is used to connect the air intake device and the pressure chamber. An electric heating network is installed inside the second connecting pipe to heat the gas coming out of the air intake device so that the gas is heated to a set temperature value before entering the pressure chamber, and the evolution law of the gas permeability performance of the test sample at different temperatures is tested.

6. The testing device for the air permeability performance of the sealing material of a compressed air energy storage chamber according to claim 5, characterized in that, The inner wall of the pressure chamber is installed with an insulation layer, which is a fibrous insulation material composed of inorganic minerals, so that the interior of the pressure chamber has good thermal insulation performance, which is used to reduce the impact of temperature changes caused by heat loss inside the pressure chamber on the testing process and improve the service life of the pressure chamber.

7. The test equipment for the gas permeability performance of the sealing material of a compressed air energy storage chamber according to claim 5, characterized in that, The outer diameter of the rubber gasket is smaller than the inner diameter of the rubber sealing ring, so as to ensure the sealing performance of the pressure chamber.

8. The test equipment for the air permeability performance of the sealing material of a compressed air energy storage chamber according to claim 5, characterized in that, The air intake device is also provided with a temperature control knob and an air pressure control knob. The current temperature and pressure state of the pressure chamber are read according to the temperature gauge and the air pressure gauge. The air intake pressure and the set temperature value can be adjusted at any time through the temperature control knob and the air pressure control knob on the control panel of the air intake device.

9. The testing device for the gas permeability of the sealing material of a compressed air energy storage chamber according to claim 5, characterized in that, The bolt and nut assembly is specially made, has corrosion resistance and can extend service life; an asymmetric thread angle design is adopted at both ends of the bolt and nut assembly, and the thread angles at both ends of the bolt are different. The asymmetric thread adjusts the thread angles on both sides to make the contact surface more matched with the force direction, and disperses the load from the high stress area to a larger contact area, which is used to reduce the local stress peak and improve fatigue resistance.

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