An in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device

Abstract

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

[0006] 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.

[0007] The gas source control module includes a gas source. The gas source is connected with the first gas flow channel through a gas inlet pipeline and a first branch pipeline, and the gas source is connected with the second gas flow channel through a gas inlet pipeline and a second branch pipeline.

[0008] 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.

[0009] 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; 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.

[0010] Optionally, a hole is arranged on the rock sample along an axial direction.

[0011] 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

[0012] The boss is provided with a third airflow channel in communication with the first airflow channel.

[0013] 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 through which the boss passes;

[0014] 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.

[0015] Optionally, a side surface of the upper pressure head away from the rock sample is arranged in a circular arc shape;

[0016] 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.

[0017] Optionally, the loading module further comprises an axial load controller, a hydraulic pump, a confining pressure booster and a silicone oil storage tank.

[0018] The output end of the axial load controller is arranged at the top end 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 confining pressure medium in the silicone oil storage tank into the high-pressure chamber, so as to increase the pressure in the high-pressure chamber; 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.

[0019] Optionally, the outer side of the rock sample is wrapped with a pipe body, two ends of the pipe body extend to the outer sides of the upper pressure head and the lower pressure head respectively, and the upper pressure head and the lower pressure 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.

[0020] Optionally, the permeability test module further comprises a fifth valve and a sixth valve.

[0021] 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.

[0022] 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.

[0023] The ends of the third branch pipeline and the fourth branch pipeline away from the first branch pipeline and the second branch pipeline are connected with the collector respectively.

[0024] Optionally, the circulation storage and release control module further comprises a seventh valve and an eighth valve.

[0025] The seventh valve is arranged on the air inlet pipeline, and the seventh valve is located between the first valve and the gas source.

[0026] The eighth valve is arranged on the air outlet pipeline, and the eighth valve is located between the second valve and the collector.

[0027] The seventh valve and the eighth valve are arranged as throttling valves.

[0028] 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.

[0029] Optionally, the integrated device further comprises a safety module.

[0030] 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.

[0031] 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.

[0032] Beneficial effects:

[0033] 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, wherein 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, 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 the gas source 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, and 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, real-time monitoring of 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 hydrogen storage library in the field is provided. BRIEF DESCRIPTION OF DRAWINGS

[0034] 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.

[0035] Figure 1 is a structural schematic view of an in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to an embodiment of the application;

[0036] Figure 2is a structural schematic diagram of a core assembly in a simulation and permeability test integrated device for in-situ salt cavern cyclic hydrogen storage and release according to an embodiment of the present application;

[0037] Figure 3 is a structural schematic diagram of an upper pressure head in a simulation and permeability test integrated device for in-situ salt cavern cyclic hydrogen storage and release according to an embodiment of the present application;

[0038] Figure 4 is a structural schematic diagram of a sealing gasket in a simulation and permeability test integrated device for in-situ salt cavern cyclic hydrogen storage and release according to an embodiment of the present application;

[0039] Figure 5 is a structural schematic diagram of a connection structure of an upper pressure head, a sealing gasket and a rock sample in a simulation and permeability test integrated device for in-situ salt cavern cyclic hydrogen storage and release according to an embodiment of the present application;

[0040] Figure 6 is a structural schematic diagram of a cyclic storage and release control system in a simulation and permeability test integrated device for in-situ salt cavern cyclic hydrogen storage and release according to an embodiment of the present application.

[0041] BRIEF DESCRIPTION OF REFERENCE NUMERALS: 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, tube body; 128, second sealing ring; 13, axial load controller; 14, hydraulic pump; 15, confining pressure booster; 16, silicone oil storage tank; 2, gas source regulation 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 dispersion 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

[0042] With reference to the drawings of the embodiments of the present application, the technical solutions in the embodiments of the present application will be described clearly and completely. Obviously, the described embodiments are some of the embodiments of the present application, but not all of the embodiments of the present application. Based on the embodiments of the present application, all other embodiments obtained by those of ordinary skill in the art without creative efforts are within the scope of the present application.

[0043] Referring to Figure 1 As shown in FIG. 1, the in-situ salt cavern hydrogen storage and release simulation and permeability test integrated device disclosed in the embodiments of the present application includes a loading module 1, a gas source regulation module 2, a cyclic storage and release control module 4, and a permeability test module 5.

[0044] Specifically, referring to Figure 1 and Figure 2 As shown in FIG. 2, the loading module 1 includes a high-pressure chamber 11 and a core assembly 12 located in the high-pressure chamber 11. The core assembly 12 includes an upper pressure head 121, a lower pressure head 122, and a rock sample 123 located between the upper pressure head 121 and the lower pressure head 122. The upper pressure head 121 has a first gas flow passage 1211, and the lower pressure head 122 has a second gas flow passage 1221. It can be understood that before the experiment, the rock sample 123, the upper pressure head 121, and the lower pressure head 122 are assembled together to form the core assembly 12, and then the core assembly 12 is installed in the high-pressure chamber 11.

[0045] In the embodiments of the present application, the loading module 1 can further include 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, and is used to apply 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, and can provide hydraulic power for the axial load controller 13 and the confining pressure booster 15.

[0046] Referring to Figure 1As shown, the gas source regulating module 2 comprises a gas source 21, which is high-pressure hydrogen in the embodiment of the present application. Meanwhile, the integrated device further comprises an air inlet pipeline 30, a first branch pipeline 31 and a second branch pipeline 32, wherein one end of the air inlet pipeline 30 is connected with the gas source 21, and the other end is connected with the first branch pipeline 31 and the second branch pipeline 32 through a three-way joint; the first branch pipeline 31 is in communication with the first airflow channel 1211 at an end away from the air inlet pipeline 30, and the second branch pipeline 32 is in communication with the second airflow channel 1221 at an end away from the air inlet pipeline 30. In this way, the gas source regulating module 2 can input the high-pressure hydrogen into the first airflow channel 1211 in the upper pressure head 121 through the air inlet pipeline 30 and the first branch pipeline 31, and into the second airflow channel 1221 in the lower pressure head 122 through the air inlet pipeline 30 and the second branch pipeline 32, so as to input the high-pressure hydrogen into both ends of the rock sample 123.

[0047] Referring to Figure 1 and Figure 6 As shown, the circulating storage and release control module 4 comprises a controller 43, a first valve 41 and a second valve 42. The first valve 41 is arranged on the air inlet pipeline 30, and the second valve 42 is arranged on a gas dispersion pipeline 33 in communication with the air inlet pipeline 30, which is located between the air inlet pipeline 30 and the first branch pipeline 31 and the second branch pipeline 32, i.e., the high-pressure hydrogen will first pass through the first valve 41 on the air inlet pipeline 30, and an end of the gas dispersion pipeline 33 away from the air inlet pipeline 30 is connected with a collector 44 for collecting the dispersed high-pressure hydrogen. Meanwhile, the controller 43 is connected with the first valve 41 and the second valve 42 for controlling the opening and closing of the first valve 41 and the second valve 42. In the embodiment of the present application, the first valve 41 and the second valve 42 are arranged as electromagnetic flow valves, and the first valve 41 and the second valve 42 are connected with the controller 43 through digital signals. The circulating storage and release control module 4 can further comprise a direct-current power supply 45 and a voltage transmitter 46, wherein the direct-current power supply 45 is used for providing power supply for the controller 43, and the voltage transmitter 46 is connected with the controller 43 through an analog signal, and is used for measuring the pressure value in the pipeline and converting it into an analog signal for the controller 43.

[0048] Referring to Figure 1As shown, the permeability test module 5 comprises a third valve 51, a fourth valve 52, a first pressure gauge 53, a second pressure gauge 54 and a collection unit 55. Among them, the third valve 51 and the first pressure gauge 53 are arranged on the first branch pipe 31, and the first pressure gauge 53 is 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 arranged on the second branch pipe 32, and the second pressure gauge 54 is used to measure the pressure value at the lower end of the rock sample 123; the collection unit 55 is connected with the first pressure gauge 53 and the second pressure gauge 54, and the collection unit 55 is used to collect the pressure data of the first pressure gauge 53 and the second pressure gauge 54.

[0049] Meanwhile, referring to Figure 1 As shown, the permeability test module 5 further comprises a fifth valve 56 and a sixth valve 57; the fifth valve 56 is arranged on the third branch pipe 34 which communicates with 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 arranged on the fourth branch pipe 35 which communicates with the second branch pipe 32, and the fourth branch pipe 35 is located between the fourth valve 52 and the loading module 1; one end of the third branch pipe 34 away from the first branch pipe 31 and one end of the fourth branch pipe 35 away from the second branch pipe 32 are respectively connected with the collector 44.

[0050] The specific operation process of the integrated device provided by the embodiment of the present application is as follows:

[0051] 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, so that the inside of the high-pressure chamber 11 is in a high-pressure state, so as to simulate the state of the rock sample 123 under the ground pressure.

[0052] Then, the cyclic storage and release experiment of the rock sample 123 is carried out 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 and control 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, 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 complete the control of the opening and closing of the first valve 41 and the second valve 42, so that the cyclic storage and release experiment of the rock sample 123 can be completed.

[0053] Next, the permeability test module 5 is used to conduct a permeability test experiment on rock sample 123. In this experiment, the first valve 41 is kept open and the second valve 42 is 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 control module 2 will simultaneously input high-pressure hydrogen to both ends of rock sample 123. After the pressure value at both ends of rock sample 123 reaches the preset value, the third valve 51, the fourth valve 52, and the fifth valve 56 are closed, and the sixth valve 57 is opened until the pressure difference at both ends of rock sample 123 reaches the preset pressure difference value. Then the sixth valve 57 is closed, and the pressure difference change is recorded using the first pressure gauge 53, the second pressure gauge 54, and the acquisition unit 55. Afterwards, the rock permeability of rock sample 123 can be calculated using the pulse attenuation method permeability formula, thus completing the permeability test experiment of rock sample 123. In this embodiment, the preset value can be 1 MPa, and the preset pressure difference value can be 200 kPa.

[0054] Thus, the integrated device for simulating hydrogen storage and release in in-situ salt caverns and testing permeability provided in this application embodiment can simulate the actual process of storing and releasing hydrogen into underground salt caverns 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; this application combines the simulation experiment of hydrogen storage and release with the permeability test into one, enabling real-time monitoring of the development of internal damage in the sample under high-frequency cyclic storage and release, and providing a reference for determining a reasonable working pressure range and circulation frequency for the operation of the on-site hydrogen storage facility.

[0055] Reference Figure 2 and Figure 5 As shown, in an optional embodiment, this application also provides an integrated device for simulating hydrogen storage and release in situ salt caverns and permeability testing. In this integrated device, an opening 1231 is provided on the rock sample 123 along the axial direction.

[0056] Specifically, the rock sample 123 is cylindrical, with an opening 1231 at its top. The opening 1231 is located at the center of the rock sample 123 and extends along its circumference, without penetrating the rock sample 123. Simultaneously, a boss 124 is provided on the upper pressure head 121, extending into the opening 1231. The shape of the boss 124 matches the shape of the opening 1231, and a third airflow channel 1241 communicating with the first airflow channel 1211 is provided within the boss 124.

[0057] In this way, when hydrogen is injected into the rock sample 123 through the first gas flow channel 1211, the hydrogen can enter the interior 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 interior of the rock sample 123, thereby better simulating the effect of hydrogen on the performance degradation of the rock sample 123, and better reflecting the process of hydrogen storage and release in the salt cavern.

[0058] With reference 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, and the sealing gasket 125 is provided with a through hole 1251 through which the boss 124 passes, and the through hole 1251 can be divided into a first part and a second part along the axial direction, wherein the first part is close to the upper pressure head 121, and 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 is assembled with the rock sample 123, it can be ensured that the first sealing ring 126 is in close contact with the upper pressure head 121, thereby ensuring the sealing between the upper pressure head 121 and the rock sample 123. In the embodiment of the present 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. At the same time, the sealing gasket 125 needs to be mechanically polished to ensure that the roughness is less than 0.8.

[0059] With reference to Figure 3 In an embodiment, the side surface of the upper pressure head 121 away from the rock sample 123 is arranged in a circular arc shape, so that the upper pressure head 121 can better fit the output end of the axial load controller 13, and ensure that the direction of the axial load is completely vertical. At the same time, the upper pressure head 121 as a whole is subjected to a conditioning process to ensure that the strength is greater than or equal to HRC50. And the side surface of the upper pressure head 121 close to the rock sample 123 is subjected to a polishing process, and the roughness is less than 0.8.

[0060] With reference to Figure 2 and Figure 3As shown, in an embodiment, a first fixing groove 1212 is formed on the outer wall of the upper press head 121 along the circumference, and a second fixing groove 1222 is formed on the outer wall of the lower press head 122 along the circumference, and the first fixing groove 1212 and the second fixing groove 1222 are used for fixing the deformation sensor. The deformation sensor can be used to monitor the deformation degree of the upper press head 121 and the lower press head 122, so as to avoid excessive deformation of the upper press head 121 and the lower press head 122.

[0061] With reference to Figure 2 As shown, in an embodiment, the rock sample 123 is wrapped with a pipe body 127, both ends of the pipe body 127 extend to the outside of the upper press head 121 and the lower press head 122, and a second sealing ring 128 is arranged on the upper press head 121 and the lower press 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 press head 121 / lower press 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 as a Teflon heat shrink tube, and after the rock sample 123 is assembled with the upper press head 121 and the lower press head 122, the rock sample 123 is plastic-wrapped by the pipe body 127 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.

[0062] With reference 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.

[0063] 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 distribution 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. The injection / exhaust rate of the rock sample 123 can be adjusted through the seventh valve 47 and the eighth valve 48, so as to realize the cycle storage and release of hydrogen in different pressure ranges and different injection rates.

[0064] With reference to Figure 1 As shown, in an embodiment, the gas source regulation module 2 further comprises a gas booster pump 22 and an air compressor 23.

[0065] Specifically, the output end of the gas booster pump 22 is communicated with the air inlet pipeline 30, and the air compressor 23 is connected with the input end of the gas booster pump 22; when the pressure of the gas source 21 cannot reach the requirement of the cyclic storage and release, the air compressor 23 can be used to provide the gas booster pump 22 with a gas pressure not less than 1 MPa, so as to increase the hydrogen pressure in the air inlet pipeline 30 to the required value. Meanwhile, a one-way valve 24 can be arranged on the air inlet pipeline 30 close to the gas source 21, so as to avoid the backflow of hydrogen into the gas source 21.

[0066] Referring to Figure 1 In an alternative embodiment, the embodiment of the 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.

[0067] 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 air 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 with 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 air inlet pipeline 30, and the fan circulation system 61 is opened at the same time, so that the hydrogen concentration in the air is rapidly reduced to below the set safety value, and the safety of indoor experiment personnel is ensured.

[0068] It should be noted that each of the embodiments in the specification is described in a progressive manner, and each embodiment focuses on the difference from other embodiments, and the same and similar parts between the embodiments can be referred to each other.

[0069] 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.

[0070] 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 in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device, characterized in that, The device comprises: a loading module comprising a high-pressure chamber and a core assembly located in the high-pressure chamber, the core assembly comprising an upper pressure head, a lower pressure head and a rock sample, the rock sample being located between the upper pressure head and the lower pressure head, the upper pressure head having a first gas flow channel, and the lower pressure head having a second gas flow channel; a gas source control module comprising a gas source, the gas source being in communication with the first gas flow channel through a gas inlet pipeline and a first branch pipeline, and the gas source being in communication with the second gas flow channel through a gas inlet pipeline and a second branch pipeline; a circulation storage and release control module comprising a controller, a first valve and a second valve, the first valve being arranged on the gas inlet pipeline, the second valve being arranged on a gas distribution pipeline in communication with the gas inlet pipeline, the gas distribution pipeline being located between the gas inlet pipeline and the first branch pipeline and the second branch pipeline, and a collector being connected to an end of the gas distribution pipeline away from the gas inlet pipeline; the controller being connected to the first valve and the second valve, and the controller being used to control the opening and closing of the first valve and the second valve; a permeability test module comprising 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 being arranged on the first branch pipeline, the fourth valve and the second pressure gauge being arranged on the second branch pipeline; the collection unit being connected to the first pressure gauge and the second pressure gauge, and the collection unit being used to collect pressure data of the first pressure gauge and the second pressure gauge.

2. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: an opening is formed in the rock sample along an axial direction; a boss is arranged on the upper pressure head, the boss extending into the opening, and the shape of the boss being matched with the shape of the opening; and a third gas flow channel is arranged in the boss and is in communication with the first gas flow channel.

3. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 2, wherein: a sealing gasket is arranged between the upper pressure head and the rock sample, the sealing gasket being bonded to the rock sample through an adhesive layer, and the sealing gasket being 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 being larger than the inner diameter of the second part to form a placing step, and a first sealing ring being arranged on the placing step.

4. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 2, wherein: a side surface of the upper pressure head away from the rock sample is arranged in a circular arc shape; a first fixing groove is formed in the outer wall of the upper pressure head along the circumference, and a second fixing groove is formed in the outer wall of the lower pressure head along the circumference, the first fixing groove and the second fixing groove being used to fix a deformation sensor.

5. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: The loading module further comprises an axial load controller, a hydraulic pump, a confining pressure intensifier and a silicone oil tank; The output end of the axial load controller is arranged at the top end of the upper pressure head, and is configured to apply axial pressure to the core assembly from top to bottom; the confining pressure intensifier is configured to fill the pressurized medium in the silicone oil tank into the high-pressure chamber to increase the pressure in the high-pressure chamber; and the hydraulic pump is connected with the axial load controller and the confining pressure intensifier, and is configured to provide hydraulic power for the axial load controller and the confining pressure intensifier.

6. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: The rock sample is wrapped with a pipe body, the pipe body extends to the outside of the upper pressure head and the lower pressure head at two ends, respectively, and the upper pressure head and the lower pressure head are provided with a second sealing ring, the end of the pipe body extends to the position where the second sealing ring is located, and the pipe body is in close contact with the second sealing ring.

7. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: 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.

8. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: The cyclic storage and release control module further comprises a seventh valve and an eighth valve; The seventh valve is arranged on the gas inlet pipeline, and the seventh valve is located between the first valve and the gas source; The eighth valve is arranged on the gas dispersion 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.

9. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: 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 gas inlet pipeline, and the air compressor is connected with the input end of the gas booster pump.

10. The in-situ salt cavern cyclic hydrogen storage and release simulation and permeability test integrated device according to claim 1, wherein: 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.

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