A salt rock creep experiment device under high-pressure hydrogen environment

Abstract

The application provides a salt rock creep experiment device under high-pressure hydrogen environment, and belongs to the technical field of rock experiments, and comprises the following: a cavity, the top and side of the cavity are provided with openings and a top cover and a side cover for closing the two openings respectively, and an observation window is arranged on the side cover, gas injection holes and exhaust holes are arranged on the side wall of the cavity on the side away from the side cover, and the height of the gas injection holes is higher than that of the exhaust holes; an experiment assembly structure is arranged in the cavity, and the experiment assembly structure comprises a sample placing table, a limiting assembly and a loading rod; a hydrogen injection and recovery system is arranged on one side of the cavity and is used for injecting high-pressure hydrogen into the cavity and recovering the high-pressure hydrogen in the cavity; and a shooting system is arranged on the side where the side cover is located and comprises a camera and a light source. Through the salt rock creep experiment device under high-pressure hydrogen environment, the safety of the experiment device can be improved, and potential safety hazards caused by circuit and air tightness problems can be reduced.

Description

TECHNICAL FIELD

[0001] Embodiments of the present application relate to the technical field of rock experiment, in particular, to a salt rock creep experiment device under high-pressure hydrogen environment. BACKGROUND

[0002] With the rapid increase of green hydrogen production (the cost of hydrogen production by water electrolysis has gradually decreased to 20-30 yuan / kg), the demand for large-scale hydrogen storage is increasingly urgent. Compared with traditional high-pressure gaseous hydrogen storage and liquid hydrogen storage, salt cavern hydrogen storage uses underground salt layer solution cavity to store hydrogen, which has three core advantages: first, the hydrogen storage scale can reach tens of thousands of cubic meters, which can effectively match the volatility of wind and light hydrogen production; second, the unit cost is only 1 / 10 of the ground storage tank, and the energy consumption is reduced by more than 50%; third, the geological sealing property is strong, and the safety is far superior to artificial facilities. There are more than 10,000 existing salt cavern resources in China, and the theoretical hydrogen storage potential accounts for 30% of future hydrogen energy demand. Through the "new energy hydrogen production + salt cavern hydrogen storage" mode, not only can the space-time mismatch problem of green hydrogen supply and demand be solved, but also key infrastructure for building a zero-carbon industrial system is provided.

[0003] Although salt cavern hydrogen storage has significant advantages, its long-term stability faces the challenge of salt rock creep characteristics. Under the action of ground stress, salt rock will slowly deform plastically (creep), resulting in the gradual shrinkage of the hydrogen storage cavity volume and the reduction of the effective hydrogen storage space; at the same time, the creep process may induce the development of microcracks in the cavity wall, increasing the risk of hydrogen permeation and leakage. In addition, hydrogen molecules are small and easy to permeate, so under high-pressure hydrogen environment, the creep characteristics and mechanism of salt rock are unknown.

[0004] Therefore, in-depth study of the creep law of salt rock and its influence on hydrogen storage safety is of great importance to optimize the design of salt cavern hydrogen storage and ensure the long-term operation reliability. SUMMARY

[0005] Embodiments of the present application provide a salt rock creep experiment device under high-pressure hydrogen environment, which aims to improve the safety of the experiment device and reduce potential safety hazards caused by circuit and air tightness problems.

[0006] Embodiments of the present application provide a salt rock creep experiment device under high-pressure hydrogen environment, which includes:

[0007] The cavity has openings at the top and side, and top and side covers for closing the two openings, respectively, and an observation window is arranged on the side cover, and a gas injection hole and a gas exhaust hole are arranged on the side wall of the cavity on the side away from the side cover, and the height of the gas injection hole is higher than that of the gas exhaust hole;

[0008] An experimental assembly structure is arranged in the cavity, and the experimental assembly structure comprises a sample placing table, a limiting assembly and a loading rod provided with a lead block at one end, the limiting assembly is arranged above the sample placing table, the loading rod is arranged on the limiting assembly, and one end of the loading rod away from the lead block faces the sample placing table, and the limiting assembly is used for limiting the loading rod from applying a load to the sample placing table in a vertical direction;

[0009] A hydrogen injection and recovery system is arranged on one side of the cavity and is used for injecting high-pressure hydrogen into the cavity and recovering high-pressure hydrogen in the cavity;

[0010] A shooting system is arranged on one side of the side cover of the cavity and comprises a camera and a light source, the light source emits light towards the cavity through the observation window, and the camera is arranged towards the observation window.

[0011] Optionally, the limiting assembly comprises a plurality of legs and a plurality of limiting plates arranged on the legs, the plurality of limiting plates are arranged in a vertical direction, and a through hole is formed in the limiting plate and penetrates the limiting plate, and the loading rod is arranged in the through hole of the plurality of limiting plates.

[0012] Optionally, the loading rod comprises a first part, a second part and a third part connected in sequence, the third part is arranged close to the sample placing table, the second part is connected with the limiting assembly, and the diameter of the third part is smaller than the diameter of the second part.

[0013] Optionally, a loading disc is arranged on the loading rod, the loading disc is located between the first part and the second part, the loading disc is located on the side of the limiting assembly away from the sample placing table, and the lead block is arranged on the loading disc.

[0014] Optionally, the hydrogen injection and recovery system comprises a first gas source, the first gas source is communicated with the gas injection hole through a first pipeline, a first valve and a booster are arranged on the first pipeline;

[0015] The hydrogen injection and recovery system further comprises an air compressor and a collector, the air compressor is connected with the booster, and the collector is communicated with an exhaust hole of the cavity;

[0016] The first gas source is hydrogen.

[0017] Optionally, the hydrogen injection and recovery system further comprises a second gas source, the second gas source is communicated with the gas injection hole through a second pipeline, and a second valve is arranged on the second pipeline;

[0018] The second gas source is helium.

[0019] Optionally, a third valve is arranged on the first pipeline, and the third valve is located between the supercharger and the cavity.

[0020] Optionally, the salt rock creep experiment device further comprises a safety shielding cover, which is arranged outside the cavity and surrounds the cavity;

[0021] The safety shielding cover is provided with a hydrogen monitoring and alarming device, which is used to send an alarm information when the hydrogen concentration in the safety shielding cover is greater than a preset value.

[0022] Optionally, an octagonal pad is arranged between the top cover and the opening of the top of the cavity, and the top cover is in close contact with the octagonal pad.

[0023] Optionally, the materials of the sample placing table, the limiting assembly and the loading rod comprise stainless steel.

[0024] Beneficial effects:

[0025] The application provides a salt rock creep experiment device under a high-pressure hydrogen environment, which comprises a cavity, an experiment assembly structure, an injection and recovery system and a shooting system, wherein the top and the side wall of the cavity are respectively provided with openings and top and side covers for closing the openings, and the side wall of the cavity is further provided with a gas injection hole and a gas exhaust hole; the experiment assembly structure comprises a sample placing table, a limiting assembly and a loading rod; the injection and recovery system is used for injecting high-pressure hydrogen into the cavity and recovering the high-pressure hydrogen in the cavity; the shooting system comprises a camera and a light source, and the light source is used for emitting light into the cavity; when the experiment device is used, after the rock sample is placed on the sample placing table, the rock sample is pressurized by the loading rod, high-pressure hydrogen is injected into the cavity by the injection and recovery system, and then the change of the sample can be photographed by the camera, so that the creep data of the rock sample can be calculated; in this way, since the high-pressure hydrogen environment in the cavity is completely isolated from the outside, the experiment device is more safe and stable, and the cavity does not need an external power supply, so that the potential risk of the experiment caused by the flammable and explosive characteristics of hydrogen is reduced. BRIEF DESCRIPTION OF DRAWINGS

[0026] 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.

[0027] Figure 1 is a whole structure schematic diagram of a salt rock creep experiment device under a high-pressure hydrogen environment according to an embodiment of the application;

[0028] Figure 2 is a cavity structure diagram of a salt rock creep experiment device under high-pressure hydrogen environment according to an embodiment of the present application;

[0029] Figure 3 is a cross-section structure diagram of a cavity and experiment assembly structure of a salt rock creep experiment device under high-pressure hydrogen environment according to an embodiment of the present application;

[0030] Figure 4 is a cross-section structure diagram of a cavity of a salt rock creep experiment device under high-pressure hydrogen environment according to an embodiment of the present application;

[0031] Figure 5 is a diagram of an experiment assembly structure of a salt rock creep experiment device under high-pressure hydrogen environment according to an embodiment of the present application;

[0032] Figure 6 is a cross-section structure diagram of an experiment assembly structure of a salt rock creep experiment device under high-pressure hydrogen environment according to an embodiment of the present application.

[0033] The figure mark explanation: 1, cavity; 11, top cover; 111, octagonal pad; 12, side cover; 13, sight glass; 131, sealing ring; 14, gas injection hole; 15, exhaust hole; 16, bolt; 2, experiment assembly structure; 21, sample placing table; 22, supporting leg; 23, limiting plate; 24, loading rod; 241, first part; 242, second part; 243, third part; 244, loading disc; 25, lead block; 3, hydrogen injection recovery system; 31, first gas source; 32, first valve; 33, pressure booster; 34, air compressor; 35, collector; 351, one-way valve; 36, first pipeline; 37, second gas source; 38, second pipeline; 381, second valve; 382, pressure gauge; 39, third valve; 41, light source; 42, photographic device; 5, rock sample; 6, safety shielding cover; 7, hydrogen monitoring alarm device. DETAILED DESCRIPTION

[0034] 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 of the embodiments of the present application, but not all 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.

[0035] In the related art, the creep rate of salt rock is generally determined through compression creep experiments by a conventional mechanical testing machine. However, the conventional mechanical testing machine cannot meet the experimental safety requirements in a high-pressure hydrogen environment due to air tightness. In addition, there are a large number of electric devices in the conventional rock mechanics testing system, and if there is a small amount of hydrogen leakage, there is a potential fire risk.

[0036] Therefore, it is urgent to develop a device and method capable of carrying out creep experiments in a high-pressure hydrogen environment.

[0037] Therefore, the present application provides a salt rock creep experiment device in a high-pressure hydrogen environment, which aims to improve the safety of the experiment device and reduce potential safety hazards caused by circuit and air tightness problems.

[0038] Referring to Figure 1 , a salt rock creep experiment device in a high-pressure hydrogen environment disclosed by the present application is provided. The experiment device includes a cavity 1, an experiment assembly structure 2, a hydrogen injection and recovery system 3, and a shooting system.

[0039] Specifically, referring to Figure 2 and Figure 3 , the cavity 1 is a cylindrical cylinder, and the whole cavity 1 is made of stainless steel material to reduce the influence of hydrogen corrosion. The top and side of the cavity 1 have openings, wherein the opening of the top is sealed by a top cover 11, the opening of the side is sealed by a side cover 12, and an observation window is provided on the side cover 12, which is assembled by a sight glass 13 provided on the side cover 12, that is, a through hole is provided on the side cover 12, and the sight glass 13 is arranged in the through hole to form an observation window, through which the creep condition of the sample can be observed.

[0040] Referring to Figure 2 , in the present application, the top cover 11 and the side cover 12 can be selected as flanges, and the top cover 11 and the cavity 1, and the side cover 12 and the cavity 1 are connected by a plurality of bolts 16. An octagonal pad 111 is arranged between the top cover 11 and the opening of the top, and a sealing ring 131 is arranged between the sight glass 13 and the opening of the side, and the top cover 11 is in close contact with the octagonal pad 111 to improve the air tightness of the cavity 1.

[0041] In addition, referring to Figure 3 and Figure 4 , a gas injection hole 14 and an exhaust hole 15 are provided on the side wall of the cavity 1 away from the side cover 12, the gas injection hole 14 and the exhaust hole 15 are linked with the inside of the cavity 1, and the height of the gas injection hole 14 on the cavity 1 is higher than that of the exhaust hole 15 on the cavity 1. The high-pressure hydrogen gas can be injected into the cavity 1 through the gas injection hole 14, and the high-pressure hydrogen gas can be discharged out of the cavity 1 through the exhaust hole 15.

[0042] Referring to Figure 1and Figure 2 As shown in the figure, the experimental assembly structure 2 is arranged in the cavity 1, and the experimental assembly structure 2 includes a sample placing table 21, a limiting assembly and a loading rod 24 provided with lead blocks 25 at one end.

[0043] Specifically, the rock sample 5 can be placed on the sample placing table 21, and since it is necessary to observe the rock sample 5 through the observation window, the top of the sample placing table 21 is arranged opposite to the observation window. The limiting assembly is arranged above the sample placing table 21, and the loading rod 24 is arranged on the limiting assembly, and the end of the loading rod 24 away from the lead blocks 25 faces the sample placing table. The number of lead blocks 25 is determined according to the load required to be loaded. Generally, the greater the load required to be loaded, the greater the number of lead blocks 25 on the loading rod 24. The loading rod 24 is used to generate a vertical load on the rock sample 5, and the limiting assembly is used to limit the loading rod 24 to only generate a load in the vertical direction on the rock sample 5 on the sample placing table 21.

[0044] It should be noted that in the embodiment of the present application, before the experiment is performed, the experimental assembly structure 2 can be located outside the cavity 1, that is, the rock sample 5 can be fixed on the sample placing table 21 outside the cavity 1, and then the experimental assembly structure 2 and the rock sample 5 can be placed into the cavity 1 through the opening at the top of the cavity 1, which can be more convenient for the operator to operate.

[0045] In addition, in order to reduce the corrosion of hydrogen, in the embodiment of the present application, the materials of the sample placing table 21, the limiting assembly and the loading rod 24 are all selected to be stainless steel materials.

[0046] Referring to Figure 1 As shown in the figure, the hydrogen injection and recovery system 3 is arranged on one side of the cavity 1, and the hydrogen injection and recovery system 3 is used to inject high-pressure hydrogen into the cavity 1 and recover the high-pressure hydrogen in the cavity 1. In the embodiment of the present application, the hydrogen injection and recovery system 3 can include a first gas source 31, a first valve 32, a booster 33, an air compressor 34 and a collector 35. The first gas source 31 is in communication with the gas injection hole 14 of the cavity 1 through a first pipeline 36, and the first gas source 31 is hydrogen. The first valve 32 and the booster 33 are both arranged on the first pipeline 36, the air compressor 34 is connected with the booster 33, and the collector 35 is in communication with the exhaust hole 15 of the cavity 1, and a one-way valve 351 is arranged on the pipeline of the cavity 1 and the collector 35.

[0047] In use, the first valve 32 is opened, and the first gas source 31 can fill high-pressure hydrogen into the cavity 1, and after the experiment is completed, the high-pressure hydrogen can be discharged from the exhaust hole 15 into the collector 35. The air compressor 34 can input compressed air into the booster 33, and increase the pressure of the hydrogen in the first pipeline 36 through the booster 33, so as to reduce the situation that the pressure of the hydrogen is insufficient.

[0048] Referring to Figure 1 As shown in the figure, the shooting system is arranged on one side of the side cover 12 of the cavity 1, and the shooting system comprises a camera 42 and a light source 41, wherein the light source 41 emits light into the cavity 1 through the observation window, and the camera 42 is arranged towards the observation window.

[0049] Before the experiment, the speckles (a pattern of uniformly distributed black and white dots) are pre-sprayed on the side of the rock sample 5, so that the subsequent digital image correlation calculation can be better identified; then the rock sample 5 is placed on the sample placing table 21, and the entire experimental assembly structure 2 is placed into the cavity 1; the cavity 1 is sealed by the top cover 11.

[0050] Then, the first valve 32 is opened, and high-pressure hydrogen is filled into the cavity 1 through the first gas source 31 until the entire cavity 1 is filled with high-pressure hydrogen, and the first valve 32 is closed. Then the rock sample 5 is irradiated by the light source 41, and the camera 42 records the morphology change of the surface of the rock sample 5 at constant intervals until the experiment ends. Then the one-way valve 351 is opened, and the high-pressure hydrogen in the cavity 1 is completely recovered by the collector 35.

[0051] Finally, the evolution process of the creep strain of the surface of the rock sample 5 is calculated by the digital image correlation method.

[0052] During the entire experiment, since the high-pressure hydrogen is located in the cavity 1 and is completely isolated from the outside, the experimental device is more safe and stable, and the cavity 1 does not need external power supply, thereby reducing the potential risks brought by the flammable and explosive characteristics of hydrogen to the experiment. At the same time, the sealing performance of the cavity 1 is high, thereby reducing the risk caused by the leakage of high-pressure hydrogen.

[0053] Referring to Figure 2 and Figure 5 As shown in the figure, in an embodiment, the limiting assembly comprises a plurality of legs 22 and a plurality of limiting plates 23 arranged on the legs 22. Specifically, the plurality of limiting plates 23 are uniformly and vertically spaced, and the limiting plates 23 are provided with through holes penetrating the limiting plates, and the loading rod 24 is arranged to pass through the plurality of limiting plates 23. In the embodiment, the plurality of legs 22 are distributed around the sample placing table 21, and the height of the leg 22 is much higher than that of the sample placing table 21; at the same time, the limiting assembly comprises three limiting plates 23, the three limiting plates 23 are fixed on the leg 22, and the three limiting plates 23 are at different heights, and the loading rod 24 passes through the three limiting plates 23. In this way, the plurality of limiting plates 23 can limit the loading direction of the loading rod 24, so that the loading rod 24 can better apply the load in the vertical direction.

[0054] Referring to Figure 5 and Figure 6As shown, in an embodiment, the loading rod 24 comprises a first section 241, a second section 242 and a third section 243 connected in sequence, wherein the third section 243 is arranged close to the sample stage 21, the second section 242 is connected with the limiting assembly, and the diameter of the third section 243 is smaller than that of the second section 242.

[0055] Specifically, in the embodiment of the present application, the loading rod 24 is divided into three sections, wherein the first section 241 cooperates with the central hole of the lead block to fix the position of the lead block 25, and the lead block can be used to increase the vertical load generated by the loading rod 24 on the rock sample 5; the second section 242 cooperates with the limiting assembly to limit the overall position of the first section 241 from being deviated; and the third section 243 is reduced in diameter (i.e. the diameter is reduced) compared with the second section 242, so that the cross-sectional area of the third section 243 is closer to the size of the rock sample 5, thereby enabling the loading rod 24 to better concentrate the entire load on the rock sample 5.

[0056] Meanwhile, the loading rod 24 is further provided with a loading disc 244, which is located between the first section 241 and the second section 242. The loading disc 244 can carry the lead block 25, and by placing the lead block 25 on the loading disc 244, the load applied by the loading rod 24 on the sample can be increased.

[0057] Referring to Figure 1 As shown, in an embodiment, the gas injection and recovery system 3 further comprises a second gas source 37.

[0058] Specifically, the second gas source 37 is helium, the second gas source 37 is communicated with the gas injection hole 14 of the cavity 1 through a second pipeline 38, and the second pipeline 38 is provided with a second valve 381 and a pressure gauge 382.

[0059] Before hydrogen is injected into the cavity 1, the first valve 32 can be closed and the second valve 381 can be opened, and the second gas source 37 is used to inject helium into the cavity 1 to displace the air inside the cavity 1, so as to avoid the air in the cavity 1 participating in the subsequent injection of hydrogen, which may bring potential safety hazards to the experiment.

[0060] Meanwhile, the first pipeline 36 is provided with a third valve 39, which is located between the pressure booster 33 and the cavity 1.

[0061] During the process of injecting helium into the cavity 1, the first valve 32 and the third valve 39 need to be closed, after the helium is injected, the third valve 39 is opened, and the reading of the pressure gauge 382 is observed, if the reading of the pressure gauge 382 does not change within 5 minutes, it is considered that the sealing of the cavity 1 is effective, otherwise the sealing of the top cover 11 and the side cover 12 needs to be rechecked, and the octagonal gasket 111 and the sealing ring 131 are replaced if necessary. In this way, the air tightness of the cavity 1 can be checked, so as to better reduce the risk of hydrogen leakage.

[0062] With reference to Figure 1 As shown in the figure, in an embodiment, the experimental device further comprises a safety shield 6, which is arranged outside the cavity 1 and surrounds the cavity 1. The safety shield 6 can be made of stainless steel, and the use of the safety shield 6 can better reduce the risk of hydrogen leakage. Moreover, the use of the safety shield 6 can also avoid the situation that the photos taken by the camera device 42 are inconsistent in brightness from front to back due to changes in external light, which affects the accuracy of subsequent calculation.

[0063] It can be understood that the safety shield 6 is provided with corresponding openings corresponding to the gas injection hole 14 and the exhaust hole 15; and the light source 41 is arranged inside the safety shield 6, and the camera device 42 is arranged outside the safety shield 6, and the safety shield 6 is also provided with corresponding openings corresponding to the camera device.

[0064] Meanwhile, the hydrogen monitoring alarm device 7 is also arranged in the safety shield 6, which is used to send an alarm information when the hydrogen concentration in the safety shield 6 is greater than a preset value, so as to ensure the safety of the experimental personnel.

[0065] It should be noted that each embodiment 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 each embodiment can be referred to.

[0066] 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.

[0067] 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. A salt rock creep experiment device in a high-pressure hydrogen environment, characterized in that, The device comprises: a cavity, the top and side of which have openings and a top cover and a side cover for closing the two openings respectively, and the side cover is provided with an observation window, a gas injection hole and a gas exhaust hole are arranged on the side wall of the cavity away from the side cover, and the height of the gas injection hole is higher than that of the gas exhaust hole; an experimental assembly structure arranged in the cavity, the experimental assembly structure comprises a sample placing table, a limiting assembly and a loading rod provided with a lead block at one end, the limiting assembly is arranged above the sample placing table, the loading rod is arranged on the limiting assembly, and the end of the loading rod away from the lead block is directed towards the sample placing table, and the limiting assembly is used for limiting the loading rod to apply a load to the sample placing table in the vertical direction; a gas injection and recovery system arranged on one side of the cavity, which is used for injecting high-pressure hydrogen into the cavity and recovering high-pressure hydrogen in the cavity; a shooting system arranged on the side of the side cover of the cavity, which comprises a camera and a light source, the light source emits light into the cavity through the observation window, and the camera is arranged towards the observation window; the loading rod comprises a first part, a second part and a third part connected in sequence, the third part is arranged close to the sample placing table, the second part is connected with the limiting assembly, and the diameter of the third part is smaller than that of the second part; a loading disc is arranged on the loading rod, the loading disc is located between the first part and the second part, and the loading disc is located on the side of the limiting assembly away from the sample placing table, and the lead block is arranged on the loading disc.

2. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 1, wherein: the limiting assembly comprises a plurality of supporting legs and a plurality of limiting plates arranged on the supporting legs, the plurality of limiting plates are arranged in the vertical direction, and the limiting plates are provided with through holes penetrating through the limiting plates, and the loading rod is arranged in the through holes of the plurality of limiting plates.

3. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 1, wherein: the gas injection and recovery system comprises a first gas source, the first gas source is communicated with the gas injection hole through a first pipeline, and the first pipeline is provided with a first valve and a booster; the gas injection and recovery system further comprises an air compressor and a collector, the air compressor is connected with the booster, and the collector is communicated with the gas exhaust hole of the cavity; wherein, the first gas source is hydrogen.

4. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 3, wherein: the gas injection and recovery system further comprises a second gas source, the second gas source is communicated with the gas injection hole through a second pipeline, and the second pipeline is provided with a second valve; wherein, the second gas source is helium.

5. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 4, wherein: a third valve is arranged on the first pipeline, and the third valve is located between the booster and the cavity.

6. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 1, wherein: The salt rock creep experiment device further comprises a safety shielding cover arranged outside the cavity and surrounding the cavity. The safety shielding cover is provided with a hydrogen monitoring and alarming device configured to send an alarm information when the hydrogen concentration in the safety shielding cover is greater than a preset value.

7. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 1, characterized in that: An octagonal pad is arranged between the top cover and the opening of the top of the cavity, and the top cover is in close contact with the octagonal pad.

8. The salt rock creep experiment device under high-pressure hydrogen environment according to claim 1, characterized in that: The materials of the sample placing table, the limiting assembly and the loading rod comprise stainless steel.

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