A test device and method for compressed gas energy storage under gas charge and discharge conditions.

Abstract

This invention discloses a compressed gas energy storage testing device and method under gas charge and discharge conditions, solving the problem that airtightness and stability cannot be tested simultaneously in existing energy storage tests. It has the beneficial effect of ensuring overall airtightness, allowing for simultaneous testing of airtightness and stability. The specific solution is as follows: A compressed gas energy storage testing device under gas charge and discharge conditions includes a storage structure unit, which includes a shell. A test section is set inside the shell. The shell and test section are independently prefabricated. The length of the test section is less than the length of the shell. A gas storage chamber is set inside the test section. The shell is filled with detachable components around the test section to simulate the surrounding rock of the gas storage chamber. A sealing layer is applied between the test section and the detachable components, and between the detachable components and the shell. The gas storage chamber is a sealed structural component. A stress loading unit is used to apply pressure to the storage structure unit. A seepage loading unit is used, with the gas injection pipeline sealed to the gas storage chamber.

Description

Technical Field

[0001] This invention relates to the field of energy storage technology, and in particular to a test device and test method for compressed gas energy storage under gas charging and discharging. Background Technology

[0002] The statements in this section are merely background information related to the present invention and do not necessarily constitute prior art.

[0003] New energy sources such as wind and solar power are inherently unstable and require energy storage technology for regulation to achieve large-scale grid connection. Compressed air energy storage (CAS), as a large-scale mechanical energy storage technology, stores potential energy in compressed air and releases it when needed to drive turbines for power generation. This effectively regulates the instability of new energy power generation and increases the proportion of renewable energy. The main form of CAS is underground gas storage chambers. Specifically, current research on CAS typically involves energy storage tests in chambers, setting up model specimens with a concrete lining structure inside which forms the gas storage chamber. Tests are conducted under external loads, but this approach has the following problems:

[0004] 1) The gas storage chamber and the external structure are an integrated structure. The integrated structure has poor airtightness, which cannot guarantee the accuracy of sensor measurements under high pressure. Only stability tests can be performed, not airtightness tests. If airtightness testing is to be performed, other sealing components need to be installed outside the integrated structure, which is complex and still cannot guarantee airtightness. This makes it impossible for the existing test structure to conduct airtightness and stability tests at the same time. Moreover, in order to keep the structure simple, the existing technology separates the airtightness test and the structural stability test. As a result, there is currently no compressed air energy storage simulation test system that can simultaneously study the airtightness and stability of the chamber under gas filling and releasing. It is impossible to reveal the coupling mechanism between the two under gas filling and releasing, resulting in an incomplete safety assessment.

[0005] 2) Existing airtightness testing devices directly store gas in the gas storage chamber and only test the static pressure environment. They cannot simulate the dynamic pressure fluctuations during the actual gas filling and discharging process, resulting in significant deviations between the test results and the actual working conditions.

[0006] 3) Each device has a gas storage chamber, and multiple tests are conducted separately, making it impossible to obtain test results for different gas storage chambers under the same conditions. Although different test devices can be tested under the same conditions, it is necessary to adjust various parameters to ensure consistency, and it takes a long time.

[0007] 4) Only one gas storage chamber can be loaded at a time, and the gas storage chamber is simply surrounded by a lining structure, which does not match the actual surrounding structure of the gas storage chamber, resulting in a certain error between the monitoring results and the actual situation.

[0008] 5) The existing device shell and lining structure are integrated. After one test, the shell and lining structure are not easy to separate and the shell cannot be reused. If it is necessary to simulate tests under different surrounding rocks, the entire structure needs to be remade.

[0009] 6) Existing devices only acquire pressure-related data in airtightness testing, lacking comprehensive monitoring of the temperature-pressure coupling effect, and cannot clarify the influence mechanism of temperature changes on the stability and airtightness of the surrounding rock. Summary of the Invention

[0010] In view of the shortcomings of the existing technology, the purpose of this invention is to provide a compressed gas energy storage test device under gas filling and discharging, which can simultaneously conduct airtightness and stability tests under gas filling and discharging.

[0011] To achieve the above objectives, the present invention is implemented through the following technical solution:

[0012] A compressed gas energy storage test device under gas charge and discharge action includes a storage structure unit, including a shell, a test section is set inside the shell, the shell and the test section are prefabricated independently, the length of the test section is less than the length of the shell, a gas storage chamber is set inside the test section, the shell is filled with detachable components around the test section to simulate the surrounding rock of the gas storage chamber, a sealing layer is applied between the test section and the detachable components, and between the detachable components and the shell, and the gas storage chamber is a sealed structural component;

[0013] Stress loading unit, used to apply pressure to the storage structure unit;

[0014] The seepage loading unit includes an injection pipeline that passes through the gas storage chamber to introduce gas into the gas storage chamber and is sealed to the gas storage chamber.

[0015] The monitoring unit includes a first pressure sensor and a strain gauge installed in the gas storage chamber. The wires of the first pressure sensor and the strain gauge pass through the test section and are sealed to the test section at the point of passage.

[0016] As described above, a compressed gas energy storage test device under gas charging and discharging action includes a test section comprising a first test section and a second test section, which are arranged in opposite directions and at a distance from each other. A first gas storage chamber is provided in the first test section, and a sealing plug is provided at the open end of the first gas storage chamber. The first gas storage chamber and the sealing plug are integrally formed. The second test section includes a second gas storage chamber.

[0017] As described above, in a gas-filled and discharged compressed gas energy storage test device, in the first test section, the end of the sealing plug away from the first gas storage chamber is spaced apart from one end of the shell, and in the second test section, one end of the second gas storage chamber is flush with the second end of the shell;

[0018] The sealing plug blocks the first gas storage chamber, and the sealing plug is positioned higher than the first gas storage chamber.

[0019] As described above, in a gas-filled and gas-released energy storage test device, the detachable component is formed by casting with gypsum or cement mortar, and the top of the shell is detachable so that the top of the shell can be installed after the detachable component is formed.

[0020] As described above, in a gas-filled and discharged energy storage test device, the first gas storage chamber is formed by a first lining and a first end plate, the first end plate is located at one end of the first lining, and the first end plate is connected to the end of the first lining as a whole.

[0021] The second gas storage chamber is formed by a second lining and a second end plate. The second end plate is located at both ends of the second lining and is connected to the ends of the second lining as a whole to ensure the sealing performance of the second gas storage chamber.

[0022] As described above, in a gas-filled and gas-released energy storage test device, the gas injection pipeline is connected to the gas cylinder and the smoke generator respectively. The gas injection pipeline passes through the shell, the detachable component and the corresponding gas storage chamber and enters the gas storage chamber. Each gas injection pipeline is equipped with a switch.

[0023] As described above, in a gas-filled and gas-released energy storage test device, the monitoring unit further includes a second pressure sensor and a flow meter installed in the gas injection pipeline;

[0024] The monitoring unit, the seepage loading unit, and the stress loading unit are each individually connected to the control unit.

[0025] As described above, the compressed gas energy storage test device under gas charging and discharging action includes a monitoring unit that further includes a displacement gauge installed on the sealing plug. The first gas storage chamber and the second gas storage chamber are respectively provided with multiple sets of strain gauges and temperature sensors. The strain gauges are embedded in the side walls of the first gas storage chamber, the second gas storage chamber, and the sealing plug.

[0026] The compressed gas energy storage test device described above, under gas filling and releasing action, has its shell made of concrete.

[0027] Secondly, the present invention also provides a testing method for a compressed gas energy storage testing device under gas charging and discharging conditions, comprising the following:

[0028] Fabricate the shell, fabricate the first test section and the second test section, install strain gauges and displacement gauges in the first test section and the second test section during the molding process, and set up corresponding gas injection pipelines;

[0029] The first and second test sections are placed in the shell in opposite directions and at a distance from each other;

[0030] The first and second test sections are supported inside the shell, and the periphery of the first and second test sections is filled with detachable components to simulate the surrounding rock of the gas storage chamber.

[0031] Gas is introduced into the first and second gas storage chambers through the gas injection pipeline to increase the gas pressure. The gas pressure values ​​in the first and second test sections are monitored by the first gas pressure sensor, and the strain values ​​in the first and second test sections are obtained by the strain gauge.

[0032] The beneficial effects of the present invention are as follows:

[0033] 1) The storage structure unit in this invention comprises three parts: a shell, a test section, and detachable components. This separate arrangement forms a three-layer structure to ensure airtightness. The gas storage chamber in the test section is a sealed structural component. After the test section is manufactured, it is placed inside the shell, coated with a sealing layer, and then filled with detachable components. The detachable components simulate the surrounding rock, thus ensuring the airtightness of the test section. The gas injection pipeline is used to introduce gas into the gas storage chamber. The gas injection pipeline is sealed to the gas storage chamber. The wires of the first pressure sensor and strain gauge pass through the test section, and the points where they pass through are sealed to the test section, thus ensuring the airtightness of the test section and the testing accuracy of the sensor under high pressure. This allows for simultaneous testing of airtightness and stability, which is beneficial for studying airtightness and stability under gas filling and releasing, and revealing the coupling mechanism between the two under gas filling and releasing.

[0034] 2) The present invention is provided with a seepage loading unit, which can introduce gas into the gas storage chamber through the gas injection pipeline. During the test, gas can be continuously introduced to simulate the dynamic pressure fluctuation during the actual gas filling and releasing process, so that the test results are closer to the actual working conditions and the gas tightness and stability of the gas storage chamber during the gas filling and releasing process can be tested.

[0035] 3) The test section in this invention includes two test sections, which are set in opposite directions and at a distance from each other. In this way, two test sections can be tested at once to obtain test results of different gas storage chambers under the same conditions, ensuring that the test parameters of the two test sections are consistent, improving test efficiency and controlling test time.

[0036] 4) In this invention, a sealing plug is provided on one side of one of the test sections. The sealing plug is equivalent to the sealing plug at one end of the existing gas storage structure and is consistent with the actual gas storage chamber peripheral structure, which improves the practicality of the test results and is conducive to studying the sealing performance of the rock-concrete interface to high-pressure gas. This test section is compared with another test section without a sealing plug, which is conducive to studying the sealing performance of the lining to high-pressure gas.

[0037] 5) In this invention, the detachable component is detachable relative to the shell and the internal test section. After the test of the internal test section is completed, the detachable component can be removed and remade to realize the test of the gas storage chamber under different surrounding rocks, which is conducive to improving the test efficiency of the next test.

[0038] 6) In this invention, the first and second gas storage chambers are equipped with temperature sensors, and the gas storage chamber is also equipped with a first pressure sensor, so as to realize the comprehensive monitoring of temperature-pressure coupling effect and clarify the influence mechanism of temperature change on the stability and airtightness of the gas storage chamber. Attached Figure Description

[0039] The accompanying drawings, which form part of this invention, are used to provide a further understanding of the invention. The illustrative embodiments of the invention and their descriptions are used to explain the invention and do not constitute an improper limitation of the invention.

[0040] Figure 1 This is a front view of a compressed gas energy storage test device under gas charging and discharging action according to one or more embodiments of the present invention.

[0041] Figure 2 This is a top view of a compressed gas energy storage test device under gas charging and discharging action according to one or more embodiments of the present invention.

[0042] The diagram exaggerates the spacing or dimensions between parts to show their positions; the diagram is for illustrative purposes only.

[0043] Wherein: 1. shell, 2. first gas storage chamber, 3. first lining, 4. sealing plug, 5. detachable component, 6. second gas storage chamber, 7. second lining, 8. second end plate, 9. first end plate. Detailed Implementation

[0044] It should be noted that the following detailed description is illustrative and intended to provide further explanation of the invention. Unless otherwise specified, all technical and scientific terms used in this invention have the same meaning as commonly understood by one of ordinary skill in the art to which this invention pertains.

[0045] It should be noted that the terminology used herein is for the purpose of describing particular embodiments only and is not intended to limit the scope of exemplary embodiments according to the invention. As used herein, unless otherwise expressly indicated by the invention, the singular form is also intended to include the plural form. Furthermore, it should be understood that when the terms "comprising" and / or "including" are used in this specification, they indicate the presence of features, steps, operations, devices, components, and / or combinations thereof.

[0046] As described in the background section, there are problems in the prior art. In order to solve the above-mentioned technical problems, the present invention proposes a compressed gas energy storage test device under gas charging and discharging action.

[0047] Example 1

[0048] In a typical embodiment of the present invention, reference is made to Figure 1 and Figure 2 As shown, a compressed gas energy storage testing device under gas charging and discharging action includes a storage structure unit, including a shell 1. A first test section and a second test section are arranged inside the shell 1, arranged in opposite directions and at a distance. A first gas storage chamber 2 is arranged inside the first test section, and a sealing plug 4 is provided at the open end of the first gas storage chamber 2. The first gas storage chamber 2 and the sealing plug 4 are integrally formed. The second test section includes a second gas storage chamber 6. Removable components 5 are filled around the first and second test sections inside the shell 1 to simulate the surrounding rock of the gas storage chambers. A sealing layer is applied between each test section and the removable components 5, and between the removable components 5 and the shell 1. Each gas storage chamber is a sealed structural component. A stress loading unit is used to apply pressure to the storage structure unit. A seepage loading unit includes a gas injection pipeline for introducing gas into the first and second gas storage chambers to simulate the gas charging and discharging process. A monitoring unit includes a first pressure sensor and a strain gauge installed at the first gas storage chamber 2 and the second gas storage chamber 6 for monitoring multi-source information during the testing process.

[0049] To ensure a reasonable structural arrangement, in the first test section, the end of the sealing plug away from the first gas storage chamber 2 is spaced apart from one end of the shell 1. In the second test section, one end of the second gas storage chamber 6 is flush with the second end of the shell 1. Both the first gas storage chamber 2 and the second gas storage chamber 6 are cylinders.

[0050] In this embodiment, the first gas storage chamber 2 is formed by the first lining 3 and the first end plate 9, with the first end plate 9 located at one end of the first lining 3; the second gas storage chamber 6 is formed by the second lining 7 and the second end plate 8, with the second end plate 8 located at both ends of the second lining 7. The first end plate 9 and the second end plate 8 are made of steel plates, and steps are provided around the steel plates so that the first end plate 9 and the second end plate 8 are placed within the steel plate steps. Embedded parts such as embedded steel bars are provided on the inner side of the steel plates, and the embedded parts are connected to the first lining or the second lining to ensure the sealing performance of the first gas storage chamber 2 and the second gas storage chamber 6.

[0051] In some examples, the first lining 3 and the second lining 7 are both made of steel fiber reinforced concrete with a thickness of 24mm and smooth inner walls. They are formed in one piece using a custom mold to ensure dimensional accuracy. In the first test section, the first lining and the sealing plug are integrally formed. The size of the sealing plug 4 is larger than the outer diameter of the first lining 3. The sealing plug adopts a wedge-shaped design with an inclination angle of 25° (meaning that the angle between the top surface of the sealing plug and the horizontal plane is 25°). Of course, other angles are also possible. The sealing plug is 400mm long and has grooves on the side with a groove depth of 2mm and a spacing of 5mm to simulate rock roughness. The uniformity of the grooves is ensured by using a 3D printed mold.

[0052] The first test section was used to study the sealing ability of the rock-concrete interface to high-pressure gas, and the second test section was used to study the sealing ability of the lining to high-pressure gas.

[0053] Moreover, the first gas storage chamber 2 and the second gas storage chamber 6 are designed based on the scaled-down model of the similarity three theorems. The precise control of the geometric similarity ratio of 1:15 ensures the consistency of the prototype and the model in terms of structural response. By setting up the first lining 3 and the second lining 7, the detachable component 5 and the shell 1 by pouring steel fiber reinforced concrete, not only are the key parameters of a typical gas storage tank restored, but also the size effect is reduced to the lowest level in the industry by matching parameters such as elastic modulus and Poisson's ratio 1:1 through material similarity design. This refined prototype simulation capability allows the test data to be directly used to infer the sealing failure mode of the real storage tank, providing a reliable conversion path from model to prototype for engineering design.

[0054] It is easy to understand that the shell 1 is the core load-bearing part of the device. It is made of C50 concrete and is 1.5m long, 1m wide and 1m high. The top of the shell 1 is detachable so that the top of the shell can be installed after the detachable components are formed. The top of the shell 1 can be a concrete slab. Concrete is poured between the concrete slab and the side wall of the shell to ensure the integrity of the shell.

[0055] In this embodiment, the detachable component 5 is made of gypsum casting to simulate medium sandstone with a density of With an elastic modulus of 45MPa, the detachable component 5 is bonded to the shell 1 with epoxy resin adhesive, and a 1mm thick sealing layer is pre-coated at the interface to ensure airtightness, simulating the surrounding rock structure under different geological conditions.

[0056] It should be noted that the stress loading unit includes a model test frame and hydraulic cylinders. The model test frame is a frame structure that supports the overall shell 1. The size of the model test frame is larger than that of the shell. The hydraulic cylinders are installed on the model test frame and can apply pressure to the storage structure unit, which can be in the lateral or longitudinal direction. The maximum stress application capacity of the hydraulic cylinders is 5MPa. Specifically, four sets of servo hydraulic cylinders are installed on the top and sides of the shell, with a pressure accuracy of 0.1% FS (accuracy). They contact the shell through an elastic pad to avoid stress concentration.

[0057] In this embodiment, the gas injection pipeline is connected to the gas cylinder and the smoke generator respectively. The gas injection pipeline includes a first gas injection pipeline and a second gas injection pipeline. The first gas injection pipeline passes through the first gas storage chamber 2 and enters the first gas storage chamber. The second gas injection pipeline enters the second gas storage chamber 6. The first gas injection pipeline and the second gas injection pipeline are connected to a hose. The hose is equipped with a switch to control the gas on / off and flow rate. The hose is connected to the gas cylinder to supply gas.

[0058] It is easy to understand that the gas injection pipeline is made of seamless steel pipe. The gas injection pipeline passes through the upper side of the first gas storage chamber and the second gas storage chamber. Each gas injection pipeline is fixedly connected to the corresponding lining and detachable component 5 through steel plate to ensure stability during gas injection. In addition, epoxy resin sealant is filled between the gas injection pipeline and the corresponding lining and detachable component 5 to seal the interface of the gas injection pipeline.

[0059] The second air pressure sensor and flow meter are installed in the first and second air injection pipelines. The second air pressure sensor is installed in the first and second air injection pipelines to collect the air injection pressure in real time. The smoke generator is connected to the first and second air injection pipelines and can inject environmentally friendly colored smoke into the storage structure unit to observe the location of the leak.

[0060] Displacement gauges are installed on the outside of the sealing plug 4 to monitor its horizontal displacement. Strain gauges are installed inside the first and second linings, and also on the side of the sealing plug 4 facing the first lining, to monitor the strain of the first lining 3, the second lining 7, and the sealing plug 4 during the test. Multiple temperature sensors are installed in the first gas storage chamber 2 and the second gas storage chamber 6, ensuring that the sensors cover key indicators such as air pressure, strain, displacement, and temperature. Combined with environmentally friendly color smoke visualization technology, leakage channels can be accurately located and leakage rates quantified, with the smallest measurable... Compared to traditional devices that can only monitor a single pressure parameter, this device expands the data dimension by more than four times, providing rich basic data for establishing a storage performance evolution model.

[0061] The displacement gauges are directly installed, the strain gauges are placed on the inner surfaces of the first lining 3 and the second lining 7, and the temperature sensors also need to be buried. All sensor cables are enameled wires, led out through L-shaped lead tubes, and the tube openings are sealed with AB glue to reduce the risk of air leakage.

[0062] As is easily understood, the monitoring unit, seepage loading unit, and stress loading unit are each connected separately to the control unit, which is a PLC controller or other type of controller. The controller records and analyzes data in real time to collect displacement and strain data of the storage structure units during the testing process. Through the monitoring unit, combined with the gas pressure and flow parameters of the gas injection pipeline, the airtightness and stability of the first and second gas storage chambers are evaluated.

[0063] Existing devices are integrated structures. The device in this application includes a shell 1, a detachable component 5, and a test section. By applying different pressures through the stress loading unit, it can simulate the confining pressure of rock layers at different depths step by step. It is simple, convenient, and quick to operate. It can systematically obtain the sealing and stability parameters of the gas storage chamber structure under different pressures. The test results can provide important references for the design optimization of the gas storage chamber, greatly improving the safety and economy of compressed air energy storage technology. Through the coordinated work of the stress loading unit and the seepage loading unit, 0-5MPa ground stress and 0-10MPa circulating air pressure can be applied simultaneously, realistically simulating the complex stress state of the underground gas storage chamber in the long-term injection-release cycle. This improves the fit between the test results and the actual engineering conditions by more than 70%, providing a reliable test platform for revealing the internal mechanism of leakage and deformation in the chamber.

[0064] The independent control of the stress loading unit and the seepage loading unit supports stepped gas injection at 0.5MPa intervals (up to 10MPa) and multi-directional geostress combination loading, which can flexibly reproduce the coupling effect of different geological conditions (medium sandstone, fine sandstone) and sealing structures (integral lining, segmented sealing plugs). Compared with field measurements, the test cycle is shortened by 60% and the cost is reduced by 50%. Furthermore, by replacing materials in detachable areas, such as using cement mortar as detachable components to simulate surrounding rock, it can quickly adapt to the testing needs of different types of reservoirs, forming a full-chain technical support capability covering "material selection - structural optimization - safety assessment".

[0065] The device provided in this embodiment features a sealed gas storage chamber in the test section. After the test section is fabricated, it is placed inside the housing, coated with a sealing layer, and then filled with detachable components. The sensor wires are sealed to the test section, and the gas injection pipeline is sealed to the gas storage chamber. This ensures the overall sealing reliability and effectively solves the problem of gas leakage at the sensor cable and pipeline interface under high pressure. By replacing conventional metal wires with enameled wires, the permeation flow is reduced by 200 times. The gas injection pipeline interface is treated with epoxy resin sealant, and with the three-layer sealing structure, the system leakage rate is controlled below 0.1% / 24h, reaching the advanced level of similar international devices. This technological breakthrough ensures the integrity of monitoring data during high-pressure loading and provides reliable hardware support for the sealing performance evaluation under complex working conditions.

[0066] Example 2

[0067] This embodiment is based on a test method for a compressed gas energy storage test device under gas charging and discharging conditions disclosed in Embodiment 1, and includes the following steps:

[0068] Step 1. Specimen preparation: Cast a shell (without the top of the shell) on a custom mold using C50 concrete and cure it at room temperature. After curing, hoist the shell into the model frame.

[0069] During construction, an integrated steel mold is first made, the inner wall is coated with a release agent, and a steel cage is lowered in. Then, concrete is poured in layers and cured at room temperature for 28 days to complete the first lining 3, sealing plug 4 and the second lining 7. The first lining 3, sealing plug 4 and the second lining 7 are made of steel fiber reinforced concrete and cured at room temperature to form the first test section and the second test section.

[0070] Step 2. Sensor Installation: Strain gauges are installed close to the corresponding lining surface, and the stress is calculated based on the measured data; temperature sensors are cast inside the corresponding lining to ensure real-time monitoring of lining temperature; displacement gauges are installed on the outside of the sealing plug to monitor horizontal displacement; strain gauges are installed inside each lining to monitor lining deformation and the first air pressure sensor; steel covers are installed in the first air storage chamber 2 and the second air storage chamber 6 respectively, and enameled wires are uniformly led out from the steel covers. Gas injection pipelines are installed in the first and second air storage chambers, and the gas injection pipelines extend upwards.

[0071] The first test section and the second test section are placed in the shell 1.

[0072] Step 3. Casting of the detachable area: Cast the detachable component, using supports to fix the first gas storage chamber 2 and the second gas storage chamber 6, pre-coating the interface with epoxy resin, heating the plaster to 60℃, and casting the plaster as a whole, leaving a 1cm joint with the integrated structure, and curing at room temperature; after curing, wrap the detachable part with plastic wrap and apply paraffin / mortar to form the detachable component.

[0073] Step 4. Assembly: Install the second air pressure sensor on the air injection pipeline and connect the smoke generator to the air injection pipeline; hoist the top of the shell to the shell, inject cement mortar into the 1cm wide reserved gap, and cure it to form an integral scaled-down structural specimen.

[0074] Step 5. Testing: After the scaled-down specimen is installed and debugged, check whether the connections of each part of the test device are firm; inject compressed air into the gas storage chamber to make the pressure in the gas storage chamber reach 0.5MPa, stabilize the pressure for 24 hours and observe the pressure change to test the initial airtightness of the gas storage chamber; after the pressure stabilizes, gradually increase the pressure in the gas storage chamber, injecting gas in a step-like manner at intervals of 0.5MPa, with the ground stress simulation range being 0-5MPa, and monitor multi-dimensional information such as pressure fluctuation, strain, displacement, and temperature; determine the leakage point based on the diffusion of colored smoke;

[0075] Step 6. Data Acquisition and Analysis: Collect and record various monitoring data in real time, plot the data change curves of each sensor based on the test records, analyze the airtightness and stability of the gas storage chamber, and calculate key parameters such as leakage rate, leakage volume, and deformation.

[0076] Based on the test results of this device, sealing plug 4, serving as the sealing plug on one side of the gas storage chamber, closely matches actual working conditions. The influence of the sealing plug length (400mm), inclination angle (25°), and surrounding rock roughness on sealing performance can be quantitatively obtained, establishing a sealing reliability assessment model that includes friction and adhesion. By analyzing the strain-displacement curves at different pressure levels (0.5MPa, 2MPa, and 10MPa), weak points in the chamber structure can be accurately identified, guiding the optimization of lining thickness and the selection of sealing materials. This ability to transform experimental data into engineering applications provides crucial safety and economic guarantees for the large-scale promotion of compressed air energy storage technology.

[0077] The above description is merely a preferred embodiment of the present invention and is not intended to limit the invention. Various modifications and variations can be made to the present invention by those skilled in the art. Any modifications, equivalent substitutions, improvements, etc., made within the spirit and principles of the present invention should be included within the scope of protection of the present invention.

Claims

1. A compressed gas energy storage testing device under gas charge and discharge conditions, characterized in that, include: The storage structure unit includes a shell, a test section is set inside the shell, the shell and the test section are prefabricated independently, the length of the test section is less than the length of the shell, a gas storage chamber is set inside the test section, the shell is filled with detachable components around the test section to simulate the surrounding rock of the gas storage chamber, a sealing layer is applied between the test section and the detachable components, and between the detachable components and the shell, and the gas storage chamber is a sealed structural component. Stress loading unit, used to apply pressure to the storage structure unit; The seepage loading unit includes an injection pipeline that passes through the gas storage chamber to introduce gas into the gas storage chamber and is sealed to the gas storage chamber. The monitoring unit includes a first pressure sensor and a strain gauge installed in the gas storage chamber. The wires of the first pressure sensor and the strain gauge pass through the test section and are sealed to the test section at the point of passage. The test section includes a first test section and a second test section. The first test section and the second test section are arranged in opposite directions and at a distance from each other. A first gas storage chamber is provided in the first test section. A sealing plug is provided at the open end of the first gas storage chamber. The first gas storage chamber and the sealing plug are integrally formed. The second test section includes a second gas storage chamber. The detachable component is formed by casting gypsum or cement mortar, and the top of the shell is detachable so that the top of the shell can be installed after the detachable component is formed; The first gas storage chamber is formed by a first lining and a first end plate. The first end plate is located at one end of the first lining and is integrally connected to the end of the first lining. The second gas storage chamber is formed by a second lining and a second end plate. The second end plate is located at both ends of the second lining and is connected to the ends of the second lining as a whole.

2. The compressed gas energy storage testing device under gas charge and discharge action according to claim 1, characterized in that, In the first test section, the end of the sealing plug away from the first gas storage chamber is spaced apart from one end of the shell, and in the second test section, one end of the second gas storage chamber is flush with the second end of the shell; The sealing plug blocks the first gas storage chamber, and the sealing plug is positioned higher than the first gas storage chamber.

3. The compressed gas energy storage testing device under gas charge and discharge action according to claim 1, characterized in that, The gas injection pipeline is connected to the gas cylinder and the smoke generator respectively. The gas injection pipeline passes through the housing, the detachable component and the corresponding gas storage chamber and enters the gas storage chamber. Each gas injection pipeline is equipped with a switch.

4. The compressed gas energy storage testing device under gas charging and discharging action according to claim 3, characterized in that, The monitoring unit also includes a second pressure sensor and a flow meter installed in the gas injection pipeline; The monitoring unit, the seepage loading unit, and the stress loading unit are each individually connected to the control unit.

5. The compressed gas energy storage testing device under gas charging and discharging action according to claim 1, characterized in that, The monitoring unit also includes a displacement gauge installed on the sealing plug. The first gas storage chamber and the second gas storage chamber are respectively provided with multiple sets of strain gauges and temperature sensors. The strain gauges are embedded in the side walls of the first gas storage chamber, the second gas storage chamber and the sealing plug.

6. The compressed gas energy storage testing device under gas charge and discharge action according to claim 1, characterized in that, The shell is made of concrete.

7. The test method for a compressed gas energy storage test device under gas charging and discharging action according to claim 1, characterized in that, Includes the following: Fabricate the shell, fabricate the first test section and the second test section, install strain gauges and displacement gauges in the first test section and the second test section during the molding process, and set up corresponding gas injection pipelines; The first and second test sections are placed in the shell in opposite directions and at a distance from each other; The first and second test sections are supported inside the shell, and the periphery of the first and second test sections is filled with detachable components to simulate the surrounding rock of the gas storage chamber. Gas is introduced into the first and second gas storage chambers through the gas injection pipeline to increase the gas pressure. The gas pressure values ​​in the first and second test sections are monitored by the first gas pressure sensor, and the strain values ​​in the first and second test sections are obtained by the strain gauge.

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