Underground energy engineering multi-field coupling catastrophe simulation device and coupling control method

Abstract

The invention discloses an underground energy engineering multi-field coupling catastrophe simulation device and a coupling control method, and relates to the field of energy storage and experimental equipment, and the underground energy engineering multi-field coupling catastrophe simulation device can be used for completing model tests of salt cavern gas storage, chamber gas storage and the like. The device comprises an air bag sealing plug, a gas humidity control system, a tail gas collection system, a gas injection system, an external circulation heating and refrigerating system, a gas storage bottle group, an air secondary compression system, a waste gas storage bottle group, an air primary compression system, an air heating and refrigerating external circulation box, a high-pressure air storage bottle group and a three-dimensional ground stress simulation platform. Accurate coupling control capability of air pressure, temperature, humidity and dynamic loading is integrated, experimental requirements of multi-parameter dynamic regulation and control can be met, and an efficient and reliable experimental platform can be provided for mechanism research of salt cavern gas storage, underground chamber gas storage and the like.

Description

Technical Field

[0001] The present invention relates to the field of energy storage and experimental equipment. Specifically, it relates to a multi-field coupling disaster simulation device and coupling control method for underground energy engineering. Background Art

[0002] With the accelerated promotion of the global energy structure transformation, the storage and utilization technologies of clean energies such as hydrogen energy and natural gas have become the research focus in the energy field. Among them, the salt cavern gas storage technology is widely used in the underground storage of natural gas, hydrogen, and carbon dioxide due to its advantages such as large capacity, low permeability, economy, and self-healing properties. In addition, the chamber gas storage technology, as another type of underground gas storage method, also has important engineering application value under specific geological conditions, which can expand the applicable range of underground gas storage and improve the flexibility and safety of energy reserves.

[0003] The existing experimental studies on salt cavern gas storage mainly focus on single-condition control, such as temperature, pressure, and in-situ stress, etc. However, in actual engineering applications, the gas storage operations of salt caverns and chambers are affected by the coupling effects of multiple complex factors, including in-situ stress changes, gas pressure fluctuations, humidity effects, temperature gradients, and cyclic loading conditions, etc. These factors not only affect the self-healing properties and gas storage capacities of salt rocks but also may lead to surrounding rock creep, leakage risks, and long-term stability problems, thus affecting the safety and service life of gas storage facilities. At present, the experimental studies on these multi-field coupling conditions are still in the preliminary exploration stage, and there is still a lack of an experimental device that can accurately simulate complex working conditions, which restricts the in-depth study of the mechanisms of salt cavern gas storage and chamber gas storage.

[0004] The existing technologies have not been able to effectively solve the above problems. There is an urgent need for an experimental system that can comprehensively consider the geological environment, gas storage working conditions, and long-term safety to promote the development of salt cavern and chamber gas storage technologies and provide a scientific basis for the design and optimization of underground gas storage projects. Summary of the Invention

[0005] In view of the problems in the related technologies, the present invention proposes a multi-field coupling disaster simulation device and coupling control method for underground energy engineering to overcome the above-mentioned technical problems existing in the existing related technologies.

[0006] For this purpose, the specific technical solutions adopted by the present invention are as follows: According to one aspect of the present invention, there is provided a multi-field coupling disaster simulation test device for underground energy engineering. This multi-field coupling disaster simulation test device for underground energy engineering is used to complete model tests such as salt cavern gas storage and chamber gas storage, and includes an airbag seal plug, a gas humidity control system, an exhaust gas collection system, an air injection system, an external circulation heating and cooling system, a gas storage cylinder group, an air secondary compression system, an exhaust gas storage cylinder group, an air primary compression system, an air heating and cooling external circulation box, a high-pressure air storage cylinder group, and a three-dimensional in-situ stress simulation platform. Among them, the airbag seal plug is located inside the salt cavern gas storage model. The salt cavern gas storage model is connected to the gas humidity control system. One end of the gas humidity control system far from the salt cavern gas storage model is sequentially connected to the exhaust gas collection system and the air injection system. The exhaust gas collection system is connected to the exhaust gas storage cylinder group. The air injection system is connected to the gas storage cylinder group, the air secondary compression system, and the air heating and cooling external circulation box. The air heating and cooling external circulation box is respectively connected to the external circulation heating and cooling system and the high-pressure air storage cylinder group. The high-pressure air storage cylinder group is connected to the air primary compression system. The three-dimensional in-situ stress simulation platform is located on one side of the salt cavern gas storage model.

[0007] Further, the airbag seal plug is used to achieve the airtightness of the test. The gas humidity control system is used to dynamically adjust the gas humidity range. The exhaust gas collection system is used to recover and process the exhaust gas. The air injection system is used to adjust the environmental parameters of the gas entering the salt cavern gas storage model, and the environmental parameters include flow rate, pressure, and humidity. The external circulation heating and cooling system is used to adjust the gas temperature and maintain the stability of the experimental environment. The gas storage cylinder group is used to provide the high-pressure gas required for the experiment. The air secondary compression system is used to supply high-pressure gas and control the air pressure range within a preset range. The exhaust gas storage cylinder group is used to store the exhaust gas released during the test. The air primary compression system is used to preliminarily compress the gas. The air heating and cooling external circulation box is used to control the gas temperature within a preset range. The high-pressure air storage cylinder group is used to store high-pressure gas. The three-dimensional in-situ stress simulation platform is used to simulate the stress conditions of the real underground environment.

[0008] Further, the airbag seal plug includes a conical sealing ring, a sealing ring in the form of two air injection rings, and is sealed by using sealing silica gel and supplemented by squeezing the air injection bag.

[0009] Furthermore, the multi-field coupling disaster simulation test device for underground energy engineering, which is used to complete the tests of the salt cavern gas storage model, includes: Store the gas in the gas cylinder group, and preliminarily compress the gas through the air primary compression system; Use the external circulation heating and cooling system and the gas humidity control system to adjust the temperature and humidity of the preliminarily compressed gas respectively; Inject the gas with adjusted temperature and humidity into the salt cavern gas storage model in the three-dimensional in-situ stress simulation platform through the gas injection system, and seal the salt cavern opening of the salt cavern gas storage model with an airbag seal; Place the salt cavern specimen in the three-dimensional in-situ stress simulation platform to simulate the real in-situ stress environment.

[0010] Furthermore, when performing the preliminary compression through the air primary compression system, when the pressure demand of the gas increases, further compress the gas through the air secondary compression system.

[0011] According to another aspect of the present invention, there is also provided a coupling control method, which includes: Construct an environmental parameter control system; use the environmental parameter control system to control the environmental parameters of the gas; When controlling the environmental parameters of the gas, perform the coupling control and decoupling control of the environmental parameters through the multi-condition coupling control module.

[0012] Furthermore, constructing the environmental parameter control system includes: Integrate the gas humidity control system, the gas injection system, the air secondary compression system and the air primary compression system into the environmental parameter control system.

[0013] Furthermore, using the environmental parameter control system to control the environmental parameters of the gas includes: Control the pressure of the gas through the air secondary compression system and the air primary compression system; Control the flow rate of the gas through the gas injection system; Control the humidity of the gas through the gas humidity control system.

[0014] Furthermore, when controlling the environmental parameters of the gas, performing the coupling control and decoupling control of the environmental parameters through the multi-condition coupling control module includes: Integrate and manage the environmental parameter control system through the central console, and uniformly control the opening and closing states of each pipeline valve through the PLC system; Based on the central console and the PLC system, and according to the experimental requirements, perform the coupling control and decoupling control of the environmental parameters of the gas.

[0015] Further, based on the central console and the PLC system, and according to the experimental requirements, the coupled control and decoupled control of the environmental parameters of the gas include: According to the experimental requirements, select the single-parameter control method and the method of simultaneously adjusting multiple parameters; Real-time monitor and adjust the environmental parameters of each gas through the central console, and use the PLC system to coordinately control the adjustment of each environmental parameter.

[0016] The beneficial effects of the present invention are as follows: (1) The present invention integrates the precise coupling control capabilities of air pressure, temperature, humidity and dynamic loading, can meet the experimental requirements of multi-parameter dynamic regulation, and provides an efficient and reliable experimental platform for the research on the mechanism of salt cavern gas storage.

[0017] (2) Compared with the existing experimental equipment, the present invention has the following significant advantages: realizing the multi-condition comprehensive regulation of air pressure, temperature, humidity and cyclic loading; meeting the long-term test requirements under high pressure and high humidity conditions; dynamically simulating the complex operating conditions of salt cavern gas storage and filling the functional gaps of existing experimental equipment.

[0018] (3) The present invention is applicable to the research on salt cavern gas storage, salt cavern compressed air energy storage and other underground energy storage technologies, and can also be extended to related geomechanics and energy storage fields, providing important support for promoting the development of clean energy technologies. Description of the Drawings

[0019] In order to more clearly illustrate the technical solutions in the embodiments of the present invention or the prior art, the following will briefly introduce the drawings required in the embodiments. Obviously, the drawings in the following description are only some embodiments of the present invention, and those of ordinary skill in the art can also obtain other drawings based on these drawings without creative efforts.

[0020] Figure 1 、 Figure 2 is a schematic structural diagram of a multi-field coupling disaster simulation test device for underground energy engineering according to an embodiment of the present invention; Figure 3 is a flowchart of a coupling control method according to an embodiment of the present invention.

[0021] In the figure: 1. Airbag seal; 2. Gas humidity control system; 3. Tail gas collection system; 4. Gas injection system; 5. External circulation heating and cooling system; 6. Gas storage cylinder group; 7. Air secondary compression system; 8. Waste gas storage cylinder group; 9. Air primary compression system; 10. Air heating and cooling external circulation box; 11. High-pressure air storage cylinder group; 12. Three-dimensional in-situ stress simulation platform. Detailed Embodiments

[0022] To further illustrate each embodiment, the present invention provides accompanying drawings, which are part of the disclosure of the present invention. They are mainly used to illustrate the embodiments and can be combined with the relevant descriptions in the specification to explain the operating principles of the embodiments. With reference to these contents, those of ordinary skill in the art should be able to understand other possible implementation manners and the advantages of the present invention. The components in the figures are not drawn to scale, and similar component symbols are generally used to represent similar components.

[0023] According to an embodiment of the present invention, there is provided an underground energy engineering multi-field coupling disaster simulation device and a coupling control method. It relates to an underground energy engineering multi-field coupling disaster simulation test device, especially an experimental device that can realize the coupling control of multiple working conditions such as humidity, temperature, inflation rate, deflation rate, and cyclic loading, and is designed specifically for simulating the complex working conditions of salt cavern gas storage, so as to simulate the complex operating conditions in actual engineering. The device of the present invention is applicable to the experimental research of salt cavern gas storage, salt cavern compressed air energy storage, and other underground energy storage technologies.

[0024] Now, the present invention will be further described in conjunction with the accompanying drawings and specific embodiments. As Figure 1 shown, according to an embodiment of the present invention, there is provided an underground energy engineering multi-field coupling disaster simulation test device. This underground energy engineering multi-field coupling disaster simulation test device is used to complete the test of the salt cavern gas storage model, and includes an airbag seal 1, a gas humidity control system 2, a tail gas collection system 3, an air injection system 4, an external circulation heating and cooling system 5, a gas storage cylinder group 6, an air secondary compression system 7, an exhaust gas storage cylinder group 8, an air primary compression system 9, an air heating and cooling external circulation box 10, a high-pressure air storage cylinder group 11, and a three-dimensional in-situ stress simulation platform 12. Among them, the airbag seal 1 is located inside the salt cavern gas storage model. The salt cavern gas storage model is connected to the gas humidity control system 2. One end of the gas humidity control system 2 far from the salt cavern gas storage model is sequentially connected to the tail gas collection system 3 and the air injection system 4. The tail gas collection system 3 is connected to the exhaust gas storage cylinder group 8. The air injection system 4 is communicated with the gas storage cylinder group 6, the air secondary compression system 7, and the air heating and cooling external circulation box 10. The air heating and cooling external circulation box 10 is respectively connected to the external circulation heating and cooling system 5 and the high-pressure air storage cylinder group 11. The high-pressure air storage cylinder group 11 is connected to the air primary compression system 9. The three-dimensional in-situ stress simulation platform 12 is located on one side of the salt cavern gas storage model.

[0025] In one embodiment, the airbag seal 1 is used to achieve the airtightness of the test, and it adopts sealing silicone and is supplemented with airbag extrusion sealing.

[0026] The gas humidity control system 2, the external circulation humidification / dehumidification module, is used to dynamically adjust the gas humidity range (30% - 98%).

[0027] The tail gas collection system 3 is used for the recovery and treatment of waste gas and is responsible for the safe recovery and treatment of waste gas.

[0028] The gas injection system 4 is used to adjust the environmental parameters of the gas entering the salt cavern gas storage model, and the environmental parameters include flow rate, pressure, and humidity.

[0029] The external circulation heating and cooling system 5 is used to adjust the gas temperature and maintain the stability of the experimental environment.

[0030] The gas storage cylinder group 6 is used to provide high-pressure gas required for the experiment.

[0031] The air secondary compression system 7 is used to supply high-pressure gas and control the air pressure range within a preset range, that is, the air pressure range is 0 - 18 MPa.

[0032] The waste gas storage cylinder group 8 is used to store the waste gas released during the experiment.

[0033] The air primary compression system 9 is used to perform preliminary compression on the gas (preliminary compression of the gas to 0.8 MPa).

[0034] The air heating and cooling external circulation box 10 is used to control the gas temperature within a preset range, that is, to provide the heating or cooling function of the air, and the temperature range is -10°C to 100°C.

[0035] The high-pressure air storage cylinder group 11 is used to store high-pressure gas, with a maximum pressure resistance of 15 MPa.

[0036] The three-dimensional in-situ stress simulation platform 12 is used to simulate the stress conditions of the real underground environment.

[0037] In one embodiment, the airbag seal plug 1 includes a conical sealing ring, a sealing ring in the form of two gas injection rings, and is sealed by using sealing silica gel supplemented by the extrusion of an airbag.

[0038] In one embodiment, the multi-field coupling disaster simulation test device for underground energy engineering is used to complete the tests on the salt cavern gas storage model, including: Store the gas (simulated gas) in the gas storage cylinder group 6 to ensure the safe storage and recycling of the gas. Perform preliminary compression on the gas through the air primary compression system 9, and the compression range is 0 - 0.8 MPa.

[0039] Use the external circulation heating and cooling system 5 and the gas humidity control system 2 to adjust the temperature and humidity of the preliminarily compressed gas respectively to meet the gas parameters required for the experiment.

[0040] Inject the gas with adjusted temperature and humidity into the salt cavern gas storage model in the three-dimensional in-situ stress simulation platform 12 through the gas injection system 4, and use the airbag sealing plug 1 to seal the salt cavern opening of the salt cavern gas storage model to prevent gas leakage.

[0041] During the experiment, place the salt cavern specimen in the three-dimensional in-situ stress simulation platform 12 to simulate the real in-situ stress environment, providing conditions for the study of the gas storage performance and seepage mechanism of the salt cavern.

[0042] After the experiment, recover the gas in the salt cavern to the gas storage cylinder group 6 through the gas injection system 4 to realize the recycling of the gas.

[0043] In one embodiment, when initially compressing through the air primary compression system 9, when the pressure requirement of the gas increases, further compress the gas through the air secondary compression system 7 to adjust the pressure to 0 - 18 MPa.

[0044] As Figure 3 shown, according to another embodiment of the present invention, a coupled control method is also provided, and the method includes: S1. Construct an environmental parameter control system; use the environmental parameter control system to control the environmental parameters of the gas.

[0045] S2. When controlling the environmental parameters of the gas, perform coupled control and decoupling control of the environmental parameters through the multi-condition coupling control module.

[0046] Coupled conditions, such as the gas pressure is 7 MPa, the gas temperature is 70 °C, and the gas humidity is 70%.

[0047] In one embodiment, constructing the environmental parameter control system includes: Integrate the gas humidity control system 2, the gas injection system 4, the air secondary compression system 7, and the air primary compression system 9 into the environmental parameter control system.

[0048] In one embodiment, using the environmental parameter control system to control the environmental parameters of the gas includes: Control the pressure of the gas through the air secondary compression system 7 and the air primary compression system 9.

[0049] Control the flow rate of the gas through the gas injection system 4.

[0050] Control the humidity of the gas through the gas humidity control system 2.

[0051] In one embodiment, when controlling the environmental parameters of the gas, performing coupled control and decoupling control of the environmental parameters through the multi-condition coupling control module includes: Integrate and manage the environmental parameter control system through the central console, and uniformly control the opening and closing states of each pipeline valve through the PLC system.

[0052] Based on the central console and the PLC system, and according to the experimental requirements, perform coupled control and decoupled control on the environmental parameters of the gas.

[0053] In one embodiment, based on the central console and the PLC system, and according to the experimental requirements, performing coupled control and decoupled control on the environmental parameters of the gas includes: According to the experimental requirements, select the method of single-parameter control and the method of simultaneously adjusting multiple parameters.

[0054] Real-time monitor and adjust the environmental parameters of each gas through the central console, and use the PLC system to cooperate in controlling the adjustment of each environmental parameter.

[0055] To facilitate the understanding of the above technical solution of the present invention, the working principle of the present invention in the actual process will be described in detail below.

[0056] The test device mainly consists of core components such as a compressed air circulation loading part, a gas humidity control part, a temperature control part, a salt cavern sealing part, and an exhaust gas control and recovery part. The design of the device fully considers the complexity of the multi-field coupling effect. It can not only operate independently, but also be used in conjunction with the three-dimensional in-situ stress simulation platform 12 to more realistically reproduce the complex evolution mechanism of the multi-field coupling effect during the salt cavern gas storage process.

[0057] Through advanced gas circulation loading and environmental regulation technologies, the device can achieve the following key functions: (1) Air pressure regulation: Support an air pressure range of 0 - 18 MPa, with an accuracy of 0.1 MPa, and can simulate the dynamic pressure changes under the actual working conditions of salt cavern gas storage.

[0058] (2) Temperature regulation: Achieve a wide range of control from -10°C to 100°C, with a regulation accuracy as high as 0.1°C.

[0059] (3) Humidity regulation: Dynamically adjust the humidity range from 30% to 98% through an external circulation humidification / dehumidification module to meet the requirements of different gas storage environments.

[0060] (4) Circulation loading capacity: Support up to 10,000 times of circulation loading, and the loading rate can be adjusted in the range of 0.01 - 1 MPa / s.

[0061] (5) Gas charging and discharging rate: Provide a gas charging and discharging rate of 0.1 - 100 L / min, suitable for a variety of experimental conditions.

[0062] The structural innovation of the device includes various airtightness solutions (such as conical sealing rings, gas injection ring seals, and silica gel seals combined with airbag extrusion technology), which can ensure long-term sealing performance under high-pressure environments. At the same time, the exhaust gas recovery module safely treats the test exhaust gas, meeting environmental protection requirements.

[0063] With the device of the present invention, the following studies can be carried out: (1) Gas diffusion and penetration behaviors of salt cavern gas storage and chamber gas storage under various working conditions.

[0064] (2) Self-healing property of salt rock and its influence on gas storage capacity.

[0065] (3) Temperature and humidity coupling effect during the gas charging and discharging processes of salt caverns and chambers.

[0066] (4) Influence of dynamic in-situ stress loading on the performance of salt cavern gas storage and chamber gas storage.

[0067] The coupling and decoupling control principles include: 1. Independent control systems: Temperature control: The air heating and cooling external circulation box 10 independently adjusts the gas temperature (-10°C to 100°C). Humidity control: The gas humidity control system 2 can independently adjust the humidity (30% - 98%). Pressure control: Air primary compression system 9: Primary pressure regulation (0 - 0.8 MPa). Air secondary compression system 7: High-pressure regulation (0 - 18 MPa).

[0068] 2. Realization of coupling control: The central console integrally manages all control systems; the PLC system uniformly controls the opening and closing states of each pipeline valve; realizes the directional flow and parameter adjustment of gas among various systems.

[0069] 3. Control process: Select single-parameter control (decoupling) according to experimental requirements, and simultaneously adjust multiple parameters (coupling). Real-time monitor and adjust various parameters through the console. The PLC system ensures the coordinated operation among various systems.

[0070] The complete path of gas migration includes: 1. Starting point: The gas cylinder group 6 provides the gas required for the experiment.

[0071] 2. Pressure regulation: Pass through the high-pressure air cylinder group 11, and select according to the pressure requirement: air primary compression system 9 or air secondary compression system 7.

[0072] 3. Parameter regulation: Control the flow rate through the gas injection system 4. Adjust the humidity through the gas humidity control system 2.

[0073] 4. Experimental stage: Gas enters the salt cavern model. The airbag seal plug 1 ensures airtightness.

[0074] 5. Gas recovery: The tail gas collection system 3 collects the gas after the experiment. The waste gas storage cylinder group 8 stores the recovered gas.

[0075] In addition, when a multi-field coupling disaster simulation test device for underground energy engineering conducts a specific experiment, it includes: I. Equipment composition and installation: The device of the present invention includes a compressed air cyclic loading subsystem and a data acquisition and control system. The device can achieve a maximum cyclic loading times of 10,000 times.

[0076] Compressed air cyclic loading subsystem: (1), air compressor unit, (2), humidity control module, (3), temperature control box. The air pressure range is 0 - 18 MPa, the temperature range is -10 °C to 100 °C, and the humidity range is 30% - 98%.

[0077] Data acquisition and control system: Adopt a PLC controller and multi-point displacement sensors to monitor data such as pressure, humidity, temperature, and strain in real time, and the accuracies are 0.1 MPa, 0.1 °C, and 10% respectively.

[0078] II. Experimental steps: Preparation stage: (1), Adjust the specimen size and boundary conditions according to the experimental design. (2), Set the initial in-situ stress, temperature, and humidity conditions.

[0079] Loading stage: (1), Set the change curves of air pressure, temperature, and humidity through the PLC system. (2), Load the dynamic stress according to the experimental design, and record the specimen deformation, stress change, and acoustic emission signal.

[0080] Circulation stage: (1), Simulate the gas filling and discharging process of the salt cavern through the gas injection and release module. (2), Adjust the number of cycles and loading rate according to the experimental requirements.

[0081] Data analysis: (1), Export the experimental data and analyze the self-healing performance and gas storage mechanism of the salt rock.

[0082] In addition, the air pressure control range of the compressed air cyclic loading subsystem is 0 - 18 MPa, the temperature control range is -10°C to 100°C, and the humidity control range is 30% - 98%. Among them, the working pressure of the primary air compression system 9 is 0 - 0.8 MPa, and the working pressure of the secondary air compression system 7 is 0 - 18 MPa. The humidity control module realizes the dynamic regulation of humidity through the external circulation humidification or dehumidification system, and the humidity regulation accuracy is 10%. The temperature control module can independently control the gas temperature of the test environment, the temperature regulation range is -10°C to 100°C, and the regulation accuracy is 0.1°C.

[0083] A method for salt cavern gas storage model test includes the following steps: (1). Set the initial experimental conditions, including in-situ stress, air pressure, temperature and humidity; (2). Load the in-situ stress by using the three-dimensional in-situ stress simulation platform 12; (3). Conduct dynamic loading experiments through the compressed air cyclic loading subsystem, and record the stress, strain and acoustic emission signals of the specimen; (4). Simulate the gas charging and discharging process of the salt cavern gas storage, and adjust the gas pressure, humidity and temperature; (5). Analyze the experimental data to verify the self-healing performance and gas storage capacity of the salt rock.

[0084] The loading rate is adjustable, and the range is 0.01 - 1 MPa / s. The gas charging and discharging rate control range is 0.1 - 100 L / min. There are three types of salt cavern sealing devices: (1). Adopt a conical sealing ring; (2). Adopt two injection rings as sealing rings; (3). Adopt sealing silicone for the inlet and outlet, and then use an injection airbag to squeeze and seal.

[0085] In summary, the present invention includes: 1. The multi-condition coupling control ability integrating humidity, temperature, air pressure and cyclic loading.

[0086] 2. The maximum air pressure control range reaches 18 MPa, and the accuracy is 0.1 MPa.

[0087] 3. The humidity control range is realized as 30% - 98%, filling the technical gap of traditional experimental equipment.

[0088] 4. The cyclic loading times are up to 10,000 times, which is suitable for long-life experimental research.

[0089] In the present invention, unless otherwise clearly specified or limited, the terms "installed", "set", "connected", "fixed", "swiveling connection", etc. shall be understood in a broad sense. For example, it may be a fixed connection, a detachable connection, or integrated; it may be a mechanical connection or an electrical connection; it may be directly connected or indirectly connected through an intermediate medium, and it may be the communication inside two components or the interaction relationship between two components. Unless otherwise clearly limited, for those of ordinary skill in the art, the specific meanings of the above terms in the present invention can be understood according to specific circumstances.

[0090] The above are only the preferred embodiments of the present invention and are not intended to limit the present invention. Any modifications, equivalent replacements, improvements, etc. made within the spirit and principle of the present invention shall be included within the protection scope of the present invention.

Claims

1. A multi-field coupling disaster simulation test device for underground energy engineering, characterized in that: The underground energy engineering multi-field coupling disaster simulation test device is used to complete the test of salt cavern gas storage, chamber gas storage, and other models, and includes an air bag sealing plug (1), a gas humidity control system (2), an exhaust gas collection system (3), a gas injection system (4), an external circulation heating and cooling system (5), a gas storage cylinder group (6), an air secondary compression system (7), an exhaust gas storage cylinder group (8), an air primary compression system (9), an air heating and cooling external circulation box (10), a high-pressure air storage cylinder group (11) and a three-dimensional ground stress simulation platform (12); The airbag sealing plug (1) is located in the salt cavern gas storage model, the salt cavern gas storage model is connected to the gas humidity control system (2), the end of the gas humidity control system (2) away from the salt cavern gas storage model is connected to the tail gas collection system (3) and the gas injection system (4) in sequence, the tail gas collection system (3) is connected to the exhaust gas storage bottle group (8), the gas injection system (4) is connected to the gas storage bottle group (6), the air secondary compression system (7) and the air heating and refrigeration external circulation box (10), the air heating and refrigeration external circulation box (10) is respectively connected to the external circulation heating and refrigeration system (5) and the high-pressure air storage bottle group (11), the high-pressure air storage bottle group (11) is connected to the air primary compression system (9), and the three-dimensional ground stress simulation platform (12) is located on one side of the salt cavern gas storage model.

2. The underground energy engineering multi-field coupling disaster simulation test device according to claim 1 is characterized in that: The airbag sealing plug (1) is used to achieve airtightness in the test; The gas humidity control system (2) is used to dynamically adjust the gas humidity range; The exhaust gas collection system (3) is used to recover and process the exhaust gas; The gas injection system (4) is used to adjust the environmental parameters of the gas entering the salt cavern gas storage model, and the environmental parameters include flow rate, pressure and humidity; The external circulation heating and cooling system (5) is used to adjust the gas temperature and maintain the stability of the experimental environment; The gas storage cylinder group (6) is used to provide high-pressure gas required for the experiment; The air secondary compression system (7) is used to supply high-pressure gas and control the gas pressure range within a preset range; The exhaust gas storage cylinder group (8) is used to store the exhaust gas released during the test; The primary air compression system (9) is used to perform preliminary compression on the gas; The air heating and refrigeration external circulation box (10) is used to control the gas temperature within a preset range; The high-pressure air storage cylinder group (11) is used to store high-pressure gas; The three-dimensional geostress simulation platform (12) is used to simulate the stress conditions of a real underground environment.

3. The underground energy engineering multi-field coupling disaster simulation test device according to claim 1 is characterized in that: The airbag sealing plug (1) includes a conical sealing ring, a sealing ring with two air injection rings, and a sealing method using sealing silicone and supplemented by air bag extrusion.

4. The underground energy engineering multi-field coupling disaster simulation test device according to claim 1 is characterized in that: The underground energy engineering multi-field coupling disaster simulation test device is used to complete the test of the salt cavern gas storage model and includes: Storing the gas in the gas storage cylinder group (6), and preliminarily compressing the gas through the primary air compression system (9); The temperature and humidity of the initially compressed gas are respectively adjusted using the external circulation heating and cooling system (5) and the gas humidity control system (2); Injecting the gas with adjusted temperature and humidity into the salt cavern gas storage model in the three-dimensional geostress simulation platform (12) through the gas injection system (4), and sealing the salt cavern opening of the salt cavern gas storage model using the airbag sealing plug (1); The salt cavern sample is placed in the three-dimensional geostress simulation platform (12) to simulate a real geostress environment.

5. The underground energy engineering multi-field coupling disaster simulation test device according to claim 4 is characterized in that: When the gas is initially compressed by the primary air compression system (9), when the pressure demand of the gas increases, the gas is further compressed by the secondary air compression system (7).

6. A coupling control method, applied to the multi-field coupling disaster simulation test device for underground energy engineering according to any one of claims 1 to 5, characterized in that: The method includes: Construct an environmental parameter control system; use the environmental parameter control system to control the environmental parameters of the gas; When the environmental parameters of the gas are controlled, coupling control and decoupling control of the environmental parameters are performed through a multi-condition coupling control module.

7. The underground energy engineering multi-field coupling disaster simulation device and coupling control method according to claim 6 is characterized in that: The construction environment parameter control system comprises: The gas humidity control system (2), the gas injection system (4), the secondary air compression system (7) and the primary air compression system (9) are integrated into an environmental parameter control system.

8. The underground energy engineering multi-field coupling disaster simulation device and coupling control method according to claim 6 is characterized in that: The use of the environmental parameter control system to control the environmental parameters of the gas includes: Controlling the pressure of the gas through the secondary air compression system (7) and the primary air compression system (9); Controlling the flow rate of gas through the gas injection system (4); The humidity of the gas is controlled by the gas humidity control system (2).

9. The multi-field coupling disaster simulation device and coupling control method for underground energy engineering according to claim 6, characterized in that: When the environmental parameters of the gas are controlled, coupling control and decoupling control of the environmental parameters are performed by the multi-condition coupling control module, including: The environmental parameter control system is integrated and managed through the central console, and the switch status of each pipeline valve is uniformly controlled through the PLC system; Based on the central control console and PLC system, and according to experimental requirements, the environmental parameters of the gas are coupled and decoupled.

10. The underground energy engineering multi-field coupling disaster simulation device and coupling control method according to claim 9, characterized in that: The coupling control and decoupling control of the environmental parameters of the gas based on the central control console and the PLC system and according to the experimental requirements include: According to the experimental requirements, choose the method of single parameter control and the method of adjusting multiple parameters at the same time; The environmental parameters of various gases are monitored and adjusted in real time through the central control console, and the PLC system is used to coordinately control the adjustment of various environmental parameters.

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