In-situ salt cavern circulation storage and release hydrogen simulation and permeability test integrated device

Abstract

The invention provides an in-situ salt cavern circulation storage and release hydrogen simulation and permeability test integrated device, and belongs to the technical field of geological hydrogen storage, the in-situ salt cavern circulation storage and release hydrogen simulation and permeability test integrated device comprises: a loading module, which comprises a high-pressure chamber and a rock core assembly located in the high-pressure chamber, and the rock core assembly comprises an upper pressure head, a lower pressure head and a rock sample; the gas source regulation and control module comprises a gas source; the circulating storage and release control module comprises a controller, a first valve and a second valve; the controller is connected with the first valve and the second valve and used for controlling opening and closing of the first valve and the second valve. And the permeability testing module comprises a third valve, a fourth valve, a first pressure gauge, a second pressure gauge and an acquisition unit. According to the salt cavern circulating storage and release hydrogen simulation and permeability test integrated device provided by the invention, a circulating storage and release hydrogen simulation experiment and a permeability test can be combined into one, and real-time monitoring of internal damage development of a sample under high-frequency circulating storage and release is realized.

Description

TECHNICAL FIELD

[0001] The embodiment of the present application relates to the technical field of geological hydrogen storage, in particular to an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device. BACKGROUND

[0002] Underground space is an ideal place for large-scale geological energy storage (including hydrogen storage), carbon dioxide sequestration and even grain storage due to its good stability, natural sealing and protection. Conventional underground space includes chambers formed due to mineral resource exploitation and salt cavities formed by extracting underground salt resources through dissolution.

[0003] Salt layers are the most ideal places for geological hydrogen storage at present due to their density (less leakage), water solubility (large-scale cavities can be built) and self-healing (long service life). Hydrogen has the characteristics of low density (high storage pressure), small molecules (easy to escape) and strong corrosion (hydrogen embrittlement), so the stability of the salt cavern will be greatly challenged under the condition of repeated high-frequency cyclic storage and release. Therefore, it is necessary to study from the aspects of indoor experiment or numerical simulation. SUMMARY

[0004] The embodiment of the present application provides an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device, which integrates cyclic hydrogen storage and release simulation experiment and permeability test, realizes real-time monitoring of internal damage development of the sample under high-frequency cyclic storage and release, and provides reference basis for determining reasonable working pressure range and cycle frequency of the hydrogen storage site.

[0005] The embodiment of the present application provides an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device, which includes: The loading module includes a high-pressure chamber and a core assembly in the high-pressure chamber, the core assembly includes an upper pressure head, a lower pressure head and a rock sample, the rock sample is located between the upper pressure head and the lower pressure head, the upper pressure head has a first gas flow channel, and the lower pressure head has a second gas flow channel; The gas source control module includes a gas source, the gas source is communicated with the first gas flow channel through a gas inlet pipeline and a first branch pipeline, and the gas source is communicated with the second gas flow channel through a gas inlet pipeline and a second branch pipeline; The circulating storage and release control module comprises a controller, a first valve and a second valve, the first valve is arranged on the air inlet pipeline, the second valve is arranged on a gas distribution pipeline in communication with the air inlet pipeline, the gas distribution pipeline is located between the air inlet pipeline and the first branch pipeline and the second branch pipeline, and a collector is connected to an end of the gas distribution pipeline away from the air inlet pipeline; the controller is connected with the first valve and the second valve, and the controller is used for controlling opening and closing of the first valve and the second valve. The permeability test module comprises a third valve, a fourth valve, a first pressure gauge, a second pressure gauge and a collection unit, the third valve and the first pressure gauge are arranged on the first branch pipeline, the fourth valve and the second pressure gauge are arranged on the second branch pipeline, and the collection unit is connected with the first pressure gauge and the second pressure gauge, and the collection unit is used for collecting pressure data of the first pressure gauge and the second pressure gauge.

[0006] Optionally, a hole is arranged on the rock sample along an axial direction. The upper pressure head is provided with a boss, the boss extends into the hole, and the shape of the boss is matched with the shape of the hole; and The boss is provided with a third airflow channel in communication with the first airflow channel.

[0007] Optionally, a sealing gasket is arranged between the upper pressure head and the rock sample, the sealing gasket is bonded to the rock sample through an adhesive layer, and the sealing gasket is provided with a through hole for the boss to pass through. The through hole comprises a first part and a second part, the inner diameter of the first part is greater than the inner diameter of the second part, so as to form a placement step, and the placement step is provided with a first sealing ring.

[0008] Optionally, a side surface of the upper pressure head away from the rock sample is provided in a circular arc shape. A first fixing groove is arranged on an outer wall of the upper pressure head along a circumferential direction, a second fixing groove is arranged on an outer wall of the lower pressure head along a circumferential direction, and the first fixing groove and the second fixing groove are used for fixing a deformation sensor.

[0009] Optionally, the loading module further comprises an axial load controller, a hydraulic pump, a confining pressure booster and a silicone oil storage tank. The output end of the axial load controller is arranged at the top end of the upper press head, and is used to apply axial pressure to the core assembly from top to bottom; the confining pressure booster is used to fill the confining pressure medium in the silicon oil storage tank into the high-pressure chamber, so as to increase the pressure in the high-pressure chamber; and the hydraulic pump is connected with the axial load controller and the confining pressure booster respectively, and is used to provide hydraulic power for the axial load controller and the confining pressure booster.

[0010] Optionally, the rock sample is wrapped with a pipe body, two ends of the pipe body extend to the outside of the upper press head and the lower press head respectively, and the upper press head and the lower press head are provided with a second sealing ring, the end of the pipe body extends to the position where the second sealing ring is arranged, and the pipe body is in close contact with the second sealing ring.

[0011] Optionally, the permeability test module further comprises a fifth valve and a sixth valve. The fifth valve is arranged on a third branch pipeline in communication with the first branch pipeline, and the third branch pipeline is located between the third valve and the loading module. The sixth valve is arranged on a fourth branch pipeline in communication with the second branch pipeline, and the fourth branch pipeline is located between the fourth valve and the loading module. The end of the third branch pipeline away from the first branch pipeline and the end of the fourth branch pipeline away from the second branch pipeline are connected with the collector respectively.

[0012] Optionally, the circulation storage and release control module further comprises a seventh valve and an eighth valve. The seventh valve is arranged on the air inlet pipeline, and the seventh valve is located between the first valve and the gas source. The eighth valve is arranged on the air outlet pipeline, and the eighth valve is located between the second valve and the collector. The seventh valve and the eighth valve are arranged as throttling valves.

[0013] Optionally, the gas source regulation module further comprises a gas booster pump and an air compressor, the output end of the gas booster pump is in communication with the air inlet pipeline, and the air compressor is connected with the input end of the gas booster pump.

[0014] Optionally, the integrated device further comprises a safety module. The safety module comprises a fan circulation system, a hydrogen concentration detection device and a safety electromagnetic valve, the safety electromagnetic valve is arranged on the air inlet pipeline, the safety electromagnetic valve is located between the gas source and the first valve, and the hydrogen concentration detection device is connected with the safety electromagnetic valve and the fan circulation system respectively. The hydrogen concentration detection device is used for detecting the hydrogen concentration in the environment, and when the hydrogen concentration is greater than a preset value, the safety electromagnetic valve is closed and the fan circulation system is opened.

[0015] Beneficial effects: The application provides an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device, which comprises a loading module, a gas source regulation module, a cyclic storage and release control module and a permeability test module. The loading module comprises a high-pressure chamber and a core assembly. The core assembly comprises an upper pressure head, a lower pressure head and a rock sample. The upper pressure head is provided with a first gas flow channel, and the lower pressure head is provided with a second gas flow channel. The gas source regulation module comprises a gas source. The gas source is communicated with the first gas flow channel through an air inlet pipeline and a first branch pipeline, and is communicated with the second gas flow channel through the air inlet pipeline and a second branch pipeline. The cyclic storage and release control module comprises a controller, a first valve and a second valve. The permeability test module comprises a third valve, a fourth valve, a first pressure gauge, a second pressure gauge and a collection unit. Hydrogen can be injected into the core assembly by using the first valve, and hydrogen in the core assembly can be discharged by using the second valve, so that a cyclic hydrogen storage experiment of the core sample is completed. Hydrogen can be injected into both ends of the core assembly by using the third valve and the fourth valve, so that a permeability test of the core sample is completed. In this way, the cyclic hydrogen storage and release simulation experiment and the permeability test are combined, the real-time monitoring of the internal damage development of the sample under high-frequency cyclic storage and release is achieved, and reference basis for determining a reasonable working pressure interval and a cyclic frequency of the operation of a hydrogen storage reservoir on site is provided. BRIEF DESCRIPTION OF DRAWINGS

[0016] In order to more clearly illustrate the technical solutions of the embodiments of the application, the following will briefly introduce the drawings needed to be used in the description of the embodiments of the application. Obviously, the drawings in the following description are only some embodiments of the application, and other drawings can be obtained by those skilled in the art without creative labor.

[0017] Figure 1 is a structural schematic diagram of an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the application; Figure 2 is a structural schematic diagram of a core assembly in an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the application; Figure 3 is a structural schematic diagram of an upper pressure head in an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the present application; Figure 4 is a structural schematic diagram of a sealing gasket in an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the present application; Figure 5 is a connection structure schematic diagram of an upper pressure head, a sealing gasket and a rock sample in an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the present application; Figure 6 is a structural schematic diagram of a cyclic storage and release control system in an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the present application.

[0018] Marked for explanation: 1, loading module; 11, high-pressure chamber; 12, core assembly; 121, upper pressure head; 1211, first gas flow channel; 1212, first fixed groove; 122, lower pressure head; 1221, second gas flow channel; 1222, second fixed groove; 123, rock sample; 1231, opening; 124, boss; 1241, third gas flow channel; 125, sealing gasket; 1251, through hole; 1252, placement step; 126, first sealing ring; 127, pipe body; 128, second sealing ring; 13, axial load controller; 14, hydraulic pump; 15, confining pressure booster; 16, silicone oil storage tank; 2, gas source control module; 21, gas source; 22, gas booster pump; 23, air compressor; 24, check valve; 30, gas inlet pipeline; 31, first branch pipeline; 32, second branch pipeline; 33, air distribution pipeline; 34, third branch pipeline; 35, fourth branch pipeline; 4, cyclic storage and release control module; 41, first valve; 42, second valve; 43, controller; 44, collector; 45, direct current power supply; 46, voltage transmitter; 47, seventh valve; 48, eighth valve; 5, permeability test module; 51, third valve; 52, fourth valve; 53, first pressure gauge; 54, second pressure gauge; 55, acquisition unit; 56, fifth valve; 57, sixth valve; 6, safety module; 61, fan circulation system; 62, hydrogen concentration detection device; 63, safety solenoid valve. DETAILED DESCRIPTION

[0019] The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application. Obviously, the described embodiments are some but not all of the embodiments of the present application. Based on the embodiments in the present application, all other embodiments obtained by those of ordinary skill in the art without creative work fall within the protection scope of the present application.

[0020] Referring to Figure 1 As shown in the figure, it is an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device disclosed by the embodiment of the application. The integrated device comprises a loading module 1, a gas source regulation module 2, a cyclic storage and release control module 4 and a permeability test module 5.

[0021] Specifically, referring to Figure 1 and Figure 2 As shown in the figure, the loading module 1 comprises a high-pressure chamber 11 and a core assembly 12 located in the high-pressure chamber 11. The core assembly 12 comprises an upper pressure head 121, a lower pressure head 122 and a rock sample 123, the rock sample 123 is located between the upper pressure head 121 and the lower pressure head 122, and the upper pressure head 121 has a first gas flow passage 1211 therein and the lower pressure head 122 has a second gas flow passage 1221 therein. It can be understood that before the experiment, the rock sample 123, the upper pressure head 121 and the lower pressure head 122 need to be assembled together to form the core assembly 12, and then the core assembly 12 is installed into the high-pressure chamber 11.

[0022] In the embodiment of the application, the loading module 1 can further comprise an axial load controller 13, a hydraulic pump 14, a confining pressure booster 15 and a silicone oil storage tank 16. The output end of the axial load controller 13 is arranged at the top end of the upper pressure head 121, for applying axial pressure to the core assembly 12 from top to bottom; the confining pressure booster 15 is used to fill the pressurized medium in the silicone oil storage tank 16 into the high-pressure chamber 11 to increase the pressure in the high-pressure chamber 11; the hydraulic pump 14 is connected with the axial load controller 13 and the confining pressure booster 15 respectively, and the hydraulic pump 14 can provide hydraulic power for the axial load controller 13 and the confining pressure booster 15.

[0023] Referring to Figure 1 As shown in the figure, the gas source regulation module 2 comprises a gas source 21, which is high-pressure hydrogen in the embodiment of the application. The integrated device further comprises an inlet pipe 30, a first branch pipe 31 and a second branch pipe 32, wherein one end of the inlet pipe 30 is connected with the gas source 21, and the other end is connected with the first branch pipe 31 and the second branch pipe 32 through a tee joint; the end of the first branch pipe 31 away from the inlet pipe 30 is in communication with the first gas flow passage 1211, and the end of the second branch pipe 32 away from the inlet pipe 30 is in communication with the second gas flow passage 1221. In this way, the gas source regulation module 2 can input the high-pressure hydrogen into the first gas flow passage 1211 in the upper pressure head 121 through the inlet pipe 30 and the first branch pipe 31, and into the second gas flow passage 1221 in the lower pressure head 122 through the inlet pipe 30 and the second branch pipe 32, so as to input the high-pressure hydrogen to the two ends of the rock sample 123 respectively.

[0024] Referring toFigure 1 and Figure 6 As shown, the circulating storage and release control module 4 includes a controller 43, a first valve 41, and a second valve 42. The first valve 41 is located on the intake pipe 30, and the second valve 42 is located on a gas dissipation pipe 33 connected to the intake pipe 30. This gas dissipation pipe 33 is situated between the intake pipe 30 and the first branch pipe 31 and the second branch pipe 32. Specifically, high-pressure hydrogen gas first passes through the first valve 41 in the intake pipe 30, and a collector 44 is connected to the end of the gas dissipation pipe 33 away from the intake pipe 30 to collect the dissipated high-pressure hydrogen gas. Simultaneously, the controller 43 is connected to the first valve 41 and the second valve 42 to control their opening and closing. In this embodiment, the first valve 41 and the second valve 42 are configured as electromagnetic flow valves, and they are connected to the controller 43 via digital signals. The circulating storage and release control module 4 may also include a DC power supply 45 and a voltage transmitter 46. The DC power supply 45 is used to provide power to the controller 43. The voltage transmitter 46 is connected to the controller 43 via an analog signal. The voltage transmitter 46 is used to measure the pressure value in the pipeline and convert it into an analog signal to be transmitted to the controller 43.

[0025] Reference Figure 1 As shown, the permeability testing module 5 includes a third valve 51, a fourth valve 52, a first pressure gauge 53, a second pressure gauge 54, and a data acquisition unit 55. The third valve 51 and the first pressure gauge 53 are mounted on the first branch pipe 31, with the first pressure gauge 53 used to measure the pressure value at the upper end of the rock sample 123. The fourth valve 52 and the second pressure gauge 54 are mounted on the second branch pipe 32, with the second pressure gauge 54 used to measure the pressure value at the lower end of the rock sample 123. The data acquisition unit 55 is connected to the first pressure gauge 53 and the second pressure gauge 54, and is used to acquire the pressure data from the first pressure gauge 53 and the second pressure gauge 54.

[0026] At the same time, refer to Figure 1 As shown, the permeability testing module 5 also includes a fifth valve 56 and a sixth valve 57; the fifth valve 56 is disposed on the third branch pipe 34 which is connected to the first branch pipe 31, and the third branch pipe 34 is located between the third valve 51 and the loading module 1; the sixth valve 57 is disposed on the fourth branch pipe 35 which is connected to the second branch pipe 32, and the fourth branch pipe 35 is located between the fourth valve 52 and the loading module 1; the end of the third branch pipe 34 away from the first branch pipe 31 and the end of the fourth branch pipe 35 away from the second branch pipe 32 are respectively connected to the collector 44.

[0027] The specific operation flow of the integrated device provided in this application embodiment is as follows: After the assembly of the core sample is completed, the assembled core assembly 12 is placed in the high-pressure chamber 11, and silicon oil is filled into the high-pressure chamber 11 to make the inside of the high-pressure chamber 11 in a high-pressure state, so as to simulate the state of the rock sample 123 under the ground under pressure.

[0028] Then, the cyclic storage and release experiment of the rock sample 123 is performed by using the cyclic storage and release control module 4. The first valve 41 and the third valve 51 are opened, and the fourth valve 52, the fifth valve 56 and the sixth valve 57 are closed, so that the gas source regulation module 2 inputs high-pressure hydrogen into the upper end of the rock sample 123 until the pressure value at the upper end of the rock sample 123 reaches the first predetermined pressure value, the first valve 41 is closed, and the second valve 42 is opened. At this time, the pressure value at the upper end of the rock sample 123 will decrease, and after the pressure value decreases to the second predetermined pressure value, the first valve 41 is opened again and the second valve 42 is closed, and the above process is repeated, and the controller 43 is used to control the opening and closing of the first valve 41 and the second valve 42. Thus, the cyclic storage and release experiment of the rock sample 123 can be completed.

[0029] Then, the permeability test experiment of the rock sample 123 is performed by using the permeability test module 5. In the experiment, the first valve 41 is kept open and the second valve 42 is kept closed; then the third valve 51 and the fourth valve 52 are opened, and the fifth valve 56 and the sixth valve 57 are closed. At this time, the gas source regulation module 2 will input high-pressure hydrogen into the upper and lower ends of the rock sample 123 at the same time. After the pressure values at the two ends of the rock sample 123 reach the preset value, the third valve 51, the fourth valve 52 and the fifth valve 56 are closed, the sixth valve 57 is opened, until a preset pressure difference value is generated between the two ends of the rock sample 123, the sixth valve 57 is closed, and the first pressure gauge 53 and the second pressure gauge 54 and the acquisition unit 55 are used to record the pressure difference change process. Then, the rock permeability of the rock sample 123 can be calculated by using the pulse attenuation method, so as to complete the permeability test experiment of the rock sample 123. In the embodiment of the present application, the preset value can be 1 MPa, and the preset pressure difference value can be 200 KPa.

[0030] In this way, by using the in-situ salt cavern cyclic storage and release hydrogen simulation and permeability test integrated device provided in the embodiment of the present application, the process of actually storing and releasing hydrogen into the underground salt cavern can be simulated by repeatedly injecting gas into the rock sample 123. The pulse attenuation method can be used to efficiently and accurately measure the permeability of the rock sample 123. The cyclic storage and release hydrogen simulation experiment and the permeability test are combined in the present application, and the real-time monitoring of the development of the internal damage of the sample under high-frequency cyclic storage and release is achieved. The reasonable working pressure interval and the cyclic frequency for the operation of the hydrogen storage reservoir on site are provided as a reference.

[0031] Reference Figure 2 and Figure 5As shown in an optional embodiment, the application also provides an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device. In the integrated device, the rock sample 123 has an opening 1231 formed in the axial direction.

[0032] Specifically, the rock sample 123 is in a cylindrical shape, the opening 1231 is formed in the top end of the rock sample 123, the opening 1231 is located in the center of the rock sample 123 and is formed along the circumference of the rock sample 123, and the opening 1231 does not penetrate through the rock sample 123. Meanwhile, the upper pressure head 121 is provided with a boss 124, the boss 124 extends into the opening 1231, the shape of the boss 124 is matched with the shape of the opening 1231, and the boss 124 is provided with a third gas flow channel 1241 which is in communication with the first gas flow channel 1211.

[0033] In this way, when hydrogen is injected into the rock sample 123 through the first gas flow channel 1211, the hydrogen enters the inside of the rock sample 123 through the third gas flow channel 1241, so that the hydrogen can act on the entire rock sample 123 from the inside of the rock sample 123, thereby better simulating the influence of hydrogen on the performance degradation of the rock sample 123 and better reflecting the process of cyclic hydrogen storage and release of the salt cavern.

[0034] Referring to Figure 2 , Figure 3 , Figure 4 and Figure 5 , in an embodiment, a sealing gasket 125 is arranged between the upper pressure head 121 and the rock sample 123, the sealing gasket 125 is provided with a through hole 1251 through which the boss 124 passes, the through hole 1251 can be divided into a first part and a second part along the axial direction, the first part is close to the upper pressure head 121, the second part is close to the rock sample 123, and the inner diameter of the first part is greater than the inner diameter of the second part, so that a placement step 1252 is formed in the through hole, and a first sealing ring 126 is arranged on the placement step 1252. The inner diameter of the first sealing ring 126 is matched with the outer diameter of the boss 124, and the height of the first sealing ring 126 is higher than the height of the placement step 1252; in this way, when the upper pressure head 121 and the rock sample 123 are assembled, the first sealing ring 126 can be ensured to be in close contact with the upper pressure head 121, thereby ensuring the sealing property between the upper pressure head 121 and the rock sample 123. In the embodiment of the application, the sealing gasket 125 can be made of metal material, for example, 304 stainless steel or 316L stainless steel, and the sealing gasket 125 and the rock sample 123 can be bonded by an adhesive layer. Meanwhile, the sealing gasket 125 needs to be mechanically polished to ensure that the roughness is less than 0.8.

[0035] Referring to Figure 3As shown, in an embodiment, the upper pressing head 121 is arranged in a circular arc shape away from the side surface of the rock sample 123, so that the upper pressing head 121 can better fit the output end of the axial load controller 13, and ensure that the axial load direction is completely vertical. At the same time, the upper pressing head 121 is subjected to a whole modulation process to ensure that the strength is greater than or equal to HRC50. And the side surface of the upper pressing head 121 close to the rock sample 123 is subjected to a polishing process, and the roughness is less than 0.8.

[0036] Referring to Figure 2 and Figure 3 As shown, in an embodiment, a first fixing groove 1212 is formed on the outer wall of the upper pressing head 121 along the circumference, and a second fixing groove 1222 is formed on the outer wall of the lower pressing head 122 along the circumference, and the first fixing groove 1212 and the second fixing groove 1222 are used to fix the deformation sensor. The deformation of the upper pressing head 121 and the lower pressing head 122 can be monitored by using the deformation sensor, so as to avoid excessive deformation of the upper pressing head 121 and the lower pressing head 122.

[0037] Referring to Figure 2 As shown, in an embodiment, the rock sample 123 is wrapped with a pipe body 127, the two ends of the pipe body 127 extend to the outside of the upper pressing head 121 and the lower pressing head 122 respectively, and a second sealing ring 128 is arranged on the upper pressing head 121 and the lower pressing head 122, the second sealing ring 128 is sleeved on the end of the pipe body 127, so as to tightly connect the end of the pipe body 127 with the upper pressing head 121 / lower pressing head 122, and ensure the sealing of the inside of the pipe body 127. In the embodiment of the present application, the pipe body 127 is selected to be a Teflon heat shrink tube, and after the rock sample 123 is assembled with the upper pressing head 121 and the lower pressing head 122, the rock sample 123 is plastic-wrapped by using the pipe body 127, so as to isolate the external confining pressure (oil) environment. Then the core assembly 12 can be loaded into the high-pressure chamber 11, and silicon oil is injected into the high-pressure chamber 11 to increase the pressure.

[0038] Referring to Figure 1 As shown, in an embodiment, the cycle storage and release module further comprises a seventh valve 47 and an eighth valve 48.

[0039] Specifically, the seventh valve 47 is arranged on the air inlet pipeline 30, and the seventh valve 47 is located between the first valve 41 and the gas source 21; the eighth valve 48 is arranged on the air outlet pipeline 33, and the eighth valve 48 is located between the second valve 42 and the collector 44; the seventh valve 47 and the eighth valve 48 are arranged as throttling valves. By the seventh valve 47 and the eighth valve 48, the gas injection / exhaust rate of the rock sample 123 can be adjusted, so as to realize the cycle storage and release of hydrogen in different pressure intervals and different gas injection rates.

[0040] Referring to Figure 1As shown, in an embodiment, the gas source regulating module 2 further comprises a gas booster pump 22 and an air compressor 23.

[0041] Specifically, the output end of the gas booster pump 22 is in communication with the gas inlet pipeline 30, and the air compressor 23 is connected to the input end of the gas booster pump 22; when the pressure of the gas source 21 cannot meet the requirements of the cyclic storage and release, the air compressor 23 can be used to provide a gas pressure of not less than 1 MPa to the gas booster pump 22, so as to increase the hydrogen pressure in the gas inlet pipeline 30 to the required value. At the same time, a one-way valve 24 can be arranged on the gas inlet pipeline 30 close to the gas source 21, so as to avoid the backflow of hydrogen into the gas source 21.

[0042] Referring to Figure 1 As shown, in an alternative embodiment, the embodiment of the present application further provides an in-situ salt cavern cyclic storage and release hydrogen simulation and permeability test integrated device, which further comprises a safety module 6.

[0043] Specifically, the safety module comprises a fan circulation system 61, a hydrogen concentration detection device 62 and a safety electromagnetic valve 63, the safety electromagnetic valve 63 is arranged on the gas inlet pipeline 30, and the safety electromagnetic valve 63 is located between the gas source 21 and the first valve 41, the hydrogen concentration detection device 62 is connected to the safety electromagnetic valve 63 and the fan circulation system 61 respectively. The hydrogen concentration detection device 62 is used to detect the hydrogen concentration in the environment, and when the hydrogen concentration is greater than a preset value, the safety electromagnetic valve 63 is closed and the fan circulation system 61 is opened. In this way, when the hydrogen concentration detection device 62 detects that there is hydrogen leakage in the environment, the safety electromagnetic valve 63 can be automatically closed to cut off the gas inlet pipeline 30, and the fan circulation system 61 is opened at the same time, so that the hydrogen concentration in the air is quickly reduced to below the set safety value, ensuring the safety of indoor experiment personnel.

[0044] It should be noted that each of the embodiments in the present specification is described in a progressive manner, and each embodiment focuses on the differences from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0045] It also needs to be explained that in this paper, the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer" and the like indicate the orientation or positional relationship based on the orientation or positional relationship shown in the drawings, and are only for the convenience of describing the present application and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a particular orientation, be constructed and operated in a particular orientation, and therefore cannot be understood as limiting the present application. In addition, relational terms such as "first" and "second" are only used to distinguish one entity or operation from another entity or operation, and do not necessarily require or imply any such actual relationship or order between the entities or operations, nor can it be understood as indicating or implying relative importance. Moreover, the terms "include", "contain" or any other variants thereof are intended to cover non-exclusive inclusion, so that the process, method, article or terminal device including a series of elements not only includes those elements, but also includes other elements not explicitly listed or inherent to such process, method, article or terminal device. Without more limitations, the element defined by the statement "including a" does not exclude the presence of another identical element in the process, method, article or terminal device including the element.

[0046] The above provides a detailed description of the technical solutions of the present application, and the principles and implementation modes of the present application are described by applying specific examples. The above example is only used to help understand the present application, and the content of the description should not be understood as limiting the present application. At the same time, for those skilled in the art, according to the present application, there will be different forms of changes in specific implementation modes and application ranges, which do not need and cannot be exhausted here, and the obvious changes or changes derived therefrom are still within the protection scope of the present application.

Claims

1. An integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability, characterized in that, include: The loading module includes a high-pressure chamber and a core assembly located within the high-pressure chamber. The core assembly includes an upper pressure head, a lower pressure head, and a rock sample. The rock sample is located between the upper pressure head and the lower pressure head. The upper pressure head has a first airflow channel, and the lower pressure head has a second airflow channel. A gas source control module includes a gas source, which is connected to the first airflow channel through an intake pipe and a first branch pipe, and the gas source is connected to the second airflow channel through an intake pipe and a second branch pipe. The circulating storage and release control module includes a controller, a first valve, and a second valve. The first valve is disposed on the air intake pipe, and the second valve is disposed on the air distribution pipe connected to the air intake pipe. The air distribution pipe is located between the air intake pipe, the first branch pipe, and the second branch pipe. A collector is connected to the end of the air distribution pipe away from the air intake pipe. The controller is connected to the first valve and the second valve and is used to control the opening and closing of the first valve and the second valve. The permeability testing module includes a third valve, a fourth valve, a first pressure gauge, a second pressure gauge, and a data acquisition unit. The third valve and the first pressure gauge are installed on the first branch pipe, and the fourth valve and the second pressure gauge are installed on the second branch pipe. The data acquisition unit is connected to the first pressure gauge and the second pressure gauge and is used to acquire the pressure data from the first pressure gauge and the second pressure gauge.

2. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The rock sample has an opening along the axial direction; The upper pressure head is provided with a boss that extends into the opening, and the shape of the boss is adapted to the shape of the opening; and The boss is provided with a third airflow channel that communicates with the first airflow channel.

3. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 2, characterized in that: A sealing gasket is provided between the upper pressure head and the rock sample. The sealing gasket is bonded to the rock sample by an adhesive layer. The sealing gasket has a through hole for the boss to pass through. The through hole includes a first part and a second part, wherein the inner diameter of the first part is larger than the inner diameter of the second part to form a placement step, and a first sealing ring is provided on the placement step.

4. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 2, characterized in that: The surface of the upper indenter away from the rock sample is set in an arc shape; The in-situ salt cavern circulating hydrogen storage and release simulation and permeability testing integrated device has a first fixing groove on the outer wall of the upper pressure head along the circumference, and a second fixing groove on the outer wall of the lower pressure head along the circumference. The first fixing groove and the second fixing groove are used to fix the deformation sensor.

5. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The loading module also includes an axial load controller, a hydraulic pump, a confining pressure booster, and a silicone oil storage tank; The output end of the axial load controller is located at the top of the upper pressure head and is used to apply axial pressure to the core assembly from top to bottom. The confining pressure booster is used to fill the high-pressure chamber with the pressurizing medium in the silicone oil storage tank to increase the pressure in the high-pressure chamber. The hydraulic pump is connected to the axial load controller and the confining pressure booster respectively, and the hydraulic pump is used to provide hydraulic power to the axial load controller and the confining pressure booster.

6. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The rock sample is wrapped with a tube, and the two ends of the tube extend to the outside of the upper pressure head and the lower pressure head, respectively. The upper pressure head and the lower pressure head are provided with a second sealing ring. The end of the tube extends to the position of the second sealing ring, and the tube is in close contact with the second sealing ring.

7. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The permeability testing module also includes a fifth valve and a sixth valve; The fifth valve is installed on the third branch pipe that is connected to the first branch pipe, and the third branch pipe is located between the third valve and the loading module; The sixth valve is installed on the fourth branch pipe, which is connected to the second branch pipe, and the fourth branch pipe is located between the fourth valve and the loading module; The end of the third branch pipe away from the first branch pipe and the end of the fourth branch pipe away from the second branch pipe are respectively connected to the collector.

8. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The circulating storage and release control module also includes a seventh valve and an eighth valve; The seventh valve is installed on the air intake pipe, and the seventh valve is located between the first valve and the gas source; The eighth valve is installed on the gas dissipation pipe, and the eighth valve is located between the second valve and the collector; The seventh valve and the eighth valve are configured as throttle valves.

9. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The gas source control module also includes a gas booster pump and an air compressor. The output end of the gas booster pump is connected to the air intake pipe, and the air compressor is connected to the input end of the gas booster pump.

10. The integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability according to claim 1, characterized in that: The integrated device also includes a security module; The safety module includes a fan circulation system, a hydrogen concentration detection device, and a safety solenoid valve. The safety solenoid valve is installed on the air intake pipe and is located between the gas source and the first valve. The hydrogen concentration detection device is connected to the safety solenoid valve and the fan circulation system. The hydrogen concentration detection device is used to detect the hydrogen concentration in the environment, and when the hydrogen concentration is greater than a preset value, the safety solenoid valve is closed and the fan circulation system is turned on.

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