Salt rock creep experiment device in high-pressure hydrogen environment

Abstract

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

Description

Technical Field

[0001] This application relates to the field of rock experimental technology, and more specifically, to an experimental apparatus for salt rock creep under high-pressure hydrogen environment. Background Technology

[0002] With the rapid increase in green hydrogen production capacity (the cost of hydrogen production through water electrolysis has gradually decreased to 20-30 yuan / kg), the demand for large-scale hydrogen storage is becoming increasingly urgent. Compared with traditional high-pressure gaseous hydrogen storage and liquid hydrogen storage, salt cavern hydrogen storage utilizes underground salt layer cavities to store hydrogen, offering three core advantages: First, the storage capacity can reach tens of millions of cubic meters, effectively matching the volatility of wind and solar hydrogen production; second, the unit cost is only 1 / 10 of that of surface storage tanks, and energy consumption is reduced by more than 50%; third, it has strong geological sealing, and its safety far exceeds that of artificial facilities. my country currently has more than 10,000 existing salt cavern resources, with a theoretical hydrogen storage potential accounting for 30% of future hydrogen energy demand. Through the "new energy hydrogen production + salt cavern hydrogen storage" model, not only can the problem of the spatial and temporal mismatch between green hydrogen supply and demand be solved, but it also provides key infrastructure for building a zero-carbon industrial system.

[0003] Despite the significant advantages of salt cavern hydrogen storage, its long-term stability faces challenges due to the creep characteristics of salt rocks. Under in-situ stress, salt rocks undergo slow plastic deformation (creep), causing the hydrogen storage cavity to gradually shrink in volume and reducing the effective hydrogen storage space. Simultaneously, the creep process may induce the development of microcracks in the cavity walls, increasing the risk of hydrogen permeation and leakage. Furthermore, given the small size and high permeability of hydrogen molecules, the creep characteristics and mechanisms of salt rocks under high-pressure hydrogen environments remain unclear.

[0004] Therefore, in-depth research on the creep law of salt rock and its impact on hydrogen storage safety is crucial for optimizing the design of salt cavern hydrogen storage and ensuring long-term operational reliability. Summary of the Invention

[0005] This application provides an experimental apparatus for salt rock creep under high-pressure hydrogen environment, which aims to improve the safety of the experimental apparatus and reduce potential safety hazards caused by circuit and airtightness issues.

[0006] This application provides an experimental apparatus for salt rock creep under high-pressure hydrogen environment, including: The cavity has openings at its top and sides, and a top cover and a side cover for closing the two openings respectively. The side cover is provided with an observation window. An air injection hole and an air exhaust hole are provided on the side wall of the cavity on the side opposite to the side cover. The height of the air injection hole is higher than that of the air exhaust hole. An experimental assembly structure is disposed within the cavity. The experimental assembly structure includes a sample placement stage, a limiting component, and a loading rod with a lead block at one end. The limiting component is disposed above the sample placement stage, and the loading rod is disposed on the limiting component. The end of the loading rod away from the lead block faces the sample placement stage. The limiting component is used to restrict the loading rod from applying a load towards the sample placement stage in the vertical direction. A gas injection and recovery system is installed on one side of the cavity for injecting high-pressure hydrogen into the cavity and recovering high-pressure hydrogen from the cavity. The imaging system is located on one side of the cavity where the side cover is located, and includes an imaging device and a light source. The light source emits light into the cavity through the observation window, and the imaging device is positioned facing the observation window.

[0007] Optionally, the limiting component includes multiple legs and multiple limiting plates disposed on the legs. The multiple limiting plates are arranged at intervals in the vertical direction, and each limiting plate has a through hole. The loading rod passes through the through hole of the multiple limiting plates.

[0008] Optionally, the loading rod includes a first part, a second part, and a third part connected in sequence, the third part being disposed close to the sample placement stage, the second part being connected to the limiting component, and the diameter of the third part being smaller than the diameter of the second part.

[0009] Optionally, a loading disk is provided on the loading rod, the loading disk is located between the first part and the second part, and the loading disk is located on the side of the limiting component away from the sample placement stage, and the lead block is disposed on the loading disk.

[0010] Optionally, the gas injection recovery system includes a first gas source, which is connected to the gas injection port through a first pipeline, and the first pipeline is equipped with a first valve and a booster. The gas injection recovery system also includes an air compressor and a collector, wherein the air compressor is connected to the booster and the collector is connected to the exhaust port of the cavity; The first gas source is hydrogen.

[0011] Optionally, the gas injection recovery system further includes a second gas source, which is connected to the gas injection port through a second pipeline, and a second valve is provided on the second pipeline; The second gas source is helium.

[0012] Optionally, a third valve is provided on the first pipeline, and the third valve is located between the booster and the cavity.

[0013] Optionally, the salt rock creep experimental apparatus further includes a safety shield, which is disposed on the outside of the cavity and surrounds the cavity. The safety shield is equipped with a hydrogen monitoring and alarm device, which is used to issue an alarm when the hydrogen concentration inside the safety shield exceeds a preset value.

[0014] Optionally, an octagonal pad is provided between the top cover and the opening at the top of the cavity, and the top cover is in close contact with the octagonal pad.

[0015] Optionally, the sample placement stage, the limiting component, and the loading rod are made of stainless steel.

[0016] Beneficial effects: This application provides an experimental apparatus for salt rock creep under high-pressure hydrogen environment. The apparatus includes a cavity, an experimental assembly structure, a gas injection and recovery system, and an imaging system. The top and side walls of the cavity have openings, and top and side covers for sealing the openings, respectively. Gas injection holes and vent holes are also provided on the side walls of the cavity. The experimental assembly structure includes a sample placement stage, a limiting component, and a loading rod. The gas injection and recovery system is used to inject high-pressure hydrogen into the cavity and recover high-pressure hydrogen from within the cavity. The imaging system includes a photographic device and a light source, with the light source emitting light into the cavity. When using this apparatus, a rock sample is placed on the sample placement stage, pressurized using the loading rod, and high-pressure hydrogen is injected into the cavity using the gas injection and recovery system. The photographic device then captures images of the sample's changes, allowing for the calculation of creep data. Because the high-pressure hydrogen environment inside the cavity is completely isolated from the outside, the experimental apparatus is safer and more stable. Furthermore, the cavity does not require an external power source, thus reducing the potential risks posed by the flammable and explosive properties of hydrogen. Attached Figure Description

[0017] To more clearly illustrate the technical solutions of the embodiments of this application, the drawings used in the description of the embodiments of this application will be briefly introduced below. Obviously, the drawings described below are only some embodiments of this application. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0018] Figure 1 This is a schematic diagram of the overall structure of an experimental device for salt rock creep under high pressure hydrogen environment according to an embodiment of this application; Figure 2 This is a schematic diagram of the cavity structure in a salt rock creep experimental device under high pressure hydrogen environment according to an embodiment of this application; Figure 3This is a cross-sectional structural diagram of the cavity and experimental assembly structure in a salt rock creep experimental device under high pressure hydrogen environment according to an embodiment of this application; Figure 4 This is a schematic diagram of the cross-sectional structure of the cavity in a salt rock creep experimental device under high pressure hydrogen environment according to an embodiment of this application; Figure 5 This is a schematic diagram of the experimental assembly structure in a salt rock creep experimental device under high pressure hydrogen environment according to an embodiment of this application; Figure 6 This is a cross-sectional schematic diagram of the experimental assembly structure in a salt rock creep experimental device under high pressure hydrogen environment according to an embodiment of this application.

[0019] Explanation of reference numerals in the attached drawings: 1. Cavity; 11. Top cover; 111. Octagonal gasket; 12. Side cover; 13. Sight glass; 131. Sealing ring; 14. Gas injection port; 15. Exhaust port; 16. Bolt; 2. Experimental assembly structure; 21. Sample placement platform; 22. Support leg; 23. Limiting plate; 24. Loading rod; 241. First part; 242. Second part; 243. Third part; 244. Loading plate; 25. Lead block; 3. Gas injection and recovery system; 31. First gas source; 32. First valve; 33. Intensifier; 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 shield; 7. Hydrogen monitoring and alarm device. Detailed Implementation

[0020] The technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, not all embodiments. Based on the embodiments of this application, all other embodiments obtained by those skilled in the art without creative effort are within the scope of protection of this application.

[0021] In related technologies, the creep rate of salt rock is generally determined by conducting compression creep experiments using conventional mechanical testing machines. However, conventional mechanical testing machines cannot meet the safety requirements for experiments under high-pressure hydrogen environments due to their airtightness. In addition, conventional rock mechanics testing systems contain a large number of electric devices, and there is a potential fire risk if even a small amount of hydrogen leaks.

[0022] Therefore, there is an urgent need to develop devices and methods that can conduct creep experiments in a high-pressure hydrogen environment.

[0023] In view of this, this application proposes a salt rock creep experimental device under high pressure hydrogen environment, which aims to improve the safety of the experimental device and reduce potential safety hazards caused by circuit and airtightness problems.

[0024] Reference Figure 1 As shown, this application discloses an experimental device for salt rock creep under high pressure hydrogen environment. The experimental device includes a cavity 1, an experimental assembly structure 2, a gas injection and recovery system 3, and a shooting system.

[0025] Specifically, refer to Figure 2 and Figure 3 As shown, cavity 1 is cylindrical and made entirely of stainless steel to mitigate the effects of hydrogen corrosion. Cavity 1 has openings at the top and sides. The top opening is sealed by a top cover 11, and the side openings are sealed by side covers 12. An observation window is provided on the side cover 12, which is assembled from a sight glass 13 mounted on the side cover 12. That is, the side cover 12 has a through hole, and the sight glass 13 is placed within the through hole to form an observation window, through which the creep of the sample can be observed.

[0026] Reference Figure 2 As shown in the embodiment of this application, the top cover 11 and the side cover 12 can be flanges. The top cover 11 and the cavity 1, and the side cover 12 and the cavity 1 are connected by multiple bolts 16. An octagonal gasket 111 is provided between the top cover 11 and the opening at the top, and a sealing ring 131 is provided between the sight glass 13 and the opening at the side. The top cover 11 and the octagonal gasket 111 are in close contact to improve the sealing performance of the cavity 1.

[0027] In addition, refer to Figure 3 and Figure 4 As shown, an injection port 14 and an exhaust port 15 are provided on the side wall of the cavity 1 away from the side cover 12. The injection port 14 and the exhaust port 15 are linked to the interior of the cavity 1, and the height of the injection port 14 on the cavity 1 is higher than the height of the exhaust port 15 on the cavity 1. High-pressure hydrogen can be injected into the cavity 1 through the injection port 14, and high-pressure hydrogen can be discharged from the cavity 1 through the exhaust port 15.

[0028] Reference Figure 1 and Figure 2 As shown, the experimental assembly structure 2 is set inside the cavity 1. The experimental assembly structure 2 includes a sample placement stage 21, a limiting component, and a loading rod 24 with a lead block 25 at one end.

[0029] Specifically, rock sample 5 can be placed on the sample stage 21. Since rock sample 5 needs to be observed through the observation window, the top of the sample stage 21 is positioned opposite the observation window. A limiting component is located above the sample stage 21, and a loading rod 24 is mounted on the limiting component. The end of the loading rod 24 away from the lead block 25 faces the sample stage. The number of lead blocks 25 is determined by the load to be applied; generally, the larger the load to be applied, the more lead blocks 25 are on the loading rod 24. The loading rod 24 is used to apply a vertical load to the rock sample 5, and the limiting component is used to restrict the loading rod 24 to apply the load only vertically towards the rock sample 5 on the sample stage 21.

[0030] It should be noted that, in the embodiments of this application, before the experiment is conducted, the experimental assembly structure 2 can be located outside the cavity 1. That is, when conducting the experiment, the rock sample 5 can be fixed on the sample placement stage 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. This is more conducive to the operation of the experimenters.

[0031] In addition, to reduce the overhead view of hydrogen, in this embodiment, the sample placement stage 21, the limiting component, and the loading rod 24 are all made of stainless steel.

[0032] Reference Figure 1 As shown, the gas injection recovery system 3 is disposed on one side of the cavity 1. The gas injection 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 this embodiment, the gas injection recovery system 3 may 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 connected to the gas injection port 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 disposed on the first pipeline 36, and the air compressor 34 is connected to the booster 33. The collector 35 is connected to the exhaust port 15 of the cavity 1, and a one-way valve 351 is disposed on the pipeline between the collector 35 and the cavity 1.

[0033] During use, opening the first valve 32 allows the first gas source 31 to fill the chamber 1 with high-pressure hydrogen. After the experiment, the high-pressure hydrogen is discharged from the exhaust port 15 into the collector 35. The air compressor 34 inputs compressed air into the booster 33, which increases the pressure of the hydrogen in the first pipeline 36 to reduce the occurrence of insufficient hydrogen pressure.

[0034] Reference Figure 1As shown, the imaging system is located on the side of the cavity 1 where the side cover 12 is located. The imaging system includes an imaging device 42 and a light source 41. The light source 41 emits light into the cavity 1 through the observation window, while the imaging device 42 is positioned facing the observation window.

[0035] Before conducting the experiment, speckle patterns (a pattern of evenly distributed black and white dots) were pre-sprayed onto the side of the rock sample 5 to facilitate better identification during subsequent calculations of the digital image; then the rock sample 5 was placed on the sample stage 21, and the entire experimental assembly structure 2 was placed into the cavity 1; the cavity 1 was sealed using the top cover 11.

[0036] Then, the first valve 32 is opened, and high-pressure hydrogen gas is introduced into the chamber 1 through the first gas source 31 until the entire chamber 1 is filled with high-pressure hydrogen gas. The first valve 32 is then closed. The rock sample 5 is then irradiated with the light source 41, and the morphological changes on the surface of the rock sample 5 are recorded at constant intervals using the photographic device 42 until the end of the experiment. Subsequently, the one-way valve 351 is opened, and the high-pressure hydrogen gas in the chamber 1 is completely recovered using the collector 35.

[0037] Finally, the surface creep strain evolution process of rock sample 5 was calculated using digital image correlation.

[0038] Throughout the experiment, the high-pressure hydrogen gas remained completely isolated from the outside environment within chamber 1, making the experimental setup safer and more stable. Furthermore, chamber 1 did not require an external power source, thus reducing the potential risks posed by the flammable and explosive properties of hydrogen. Simultaneously, the high sealing performance of chamber 1 minimized the risk of high-pressure hydrogen leakage.

[0039] Reference Figure 2 and Figure 5 As shown, in one embodiment, the limiting component includes multiple legs 22 and multiple limiting plates 23 disposed on the legs 22. Specifically, the multiple limiting plates 23 are evenly spaced along the vertical direction, and each limiting plate 23 has a through hole for limiting the load. The loading rod 24 passes through the multiple limiting plates 23. In this embodiment, the multiple legs 22 are distributed around the sample placement stage 21, and the height of the legs 22 is much higher than that of the sample placement stage 21. At the same time, the limiting component includes three limiting plates 23, which are fixed to the legs 22 and are at different heights. The loading rod 24 passes through the three limiting plates 23. In this way, the loading direction of the loading rod 24 can be limited by the multiple limiting plates 23, so that the loading rod 24 can better apply load in the vertical direction.

[0040] Reference Figure 5 and Figure 6As shown, in one embodiment, the loading rod 24 includes a first part 241, a second part 242 and a third part 243 connected in sequence, wherein the third part 243 is disposed close to the sample placement stage 21, the second part 242 is connected to the limiting component, and the diameter of the third part 243 is smaller than the diameter of the second part 242.

[0041] Specifically, in this embodiment, the loading rod 24 is divided into three sections. The first section 241 is fitted with the central hole of the lead block to fix the position of the lead block 25. The lead block can increase the vertical load generated by the loading rod 24 on the rock sample 5. The second section 242 is fitted with the limiting component to limit the overall position of the first section 241 from shifting. The third section 243 is reduced in diameter compared to 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 allowing the loading rod 24 to better concentrate all the load on the rock sample 5.

[0042] Meanwhile, the loading rod 24 is also provided with a loading disk 244, which is located between the first part 241 and the second part 242. The loading disk 244 can carry the lead block 25. By placing the lead block 25 on the loading disk 244, the load applied by the loading rod 24 to the sample can be increased.

[0043] Reference Figure 1 As shown, in one embodiment, the gas recovery system 3 further includes a second gas source 37.

[0044] Specifically, the second gas source 37 is helium, and the second gas source 37 is connected to the gas injection port 14 of the cavity 1 through the second pipeline 38. The second pipeline 38 is equipped with a second valve 381 and a pressure gauge 382.

[0045] Before injecting hydrogen into cavity 1, the first valve 32 can be closed and the second valve 381 opened. Helium can be injected into cavity 1 using the second gas source 37 to replace the air inside cavity 1, so as to avoid the presence of air in cavity 1 during subsequent hydrogen injection, which could pose a potential safety hazard to the experiment.

[0046] Meanwhile, a third valve 39 is provided on the first pipeline 36, and the third valve 39 is located between the booster 33 and the cavity 1.

[0047] During the injection of helium into 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 pressure gauge 382 is observed. If the reading of pressure gauge 382 does not change within 5 minutes, the seal of cavity 1 is considered effective; otherwise, the sealing of the top cover 11 and the side cover 12 needs to be rechecked, and the octagonal gasket 111 and sealing ring 131 should be replaced if necessary. This allows for the checking of the airtightness of cavity 1, thereby better reducing the risk of hydrogen leakage.

[0048] Reference Figure 1 As shown, in one embodiment, the experimental apparatus further includes a safety shield 6, which is disposed outside the cavity 1 and surrounds the cavity 1. The safety shield 6 can be made of stainless steel, which can better reduce the risk of hydrogen leakage. Furthermore, the safety shield 6 can also prevent inconsistent brightness in the photographs taken by the imaging device 42 due to changes in external light, thus avoiding affecting the accuracy of subsequent calculations.

[0049] It is understandable that corresponding openings are provided on the safety shield 6 at the positions corresponding to the air injection port 14 and the air exhaust port 15; and the light source 41 is located inside the safety shield 6, the camera device 42 is located outside the safety shield 6, and corresponding openings are also provided on the safety shield 6 at the positions corresponding to the camera device.

[0050] Meanwhile, a hydrogen monitoring and alarm device 7 is also installed inside the safety shield 6. The hydrogen monitoring and alarm device 7 is used to issue an alarm message when the hydrogen concentration inside the safety shield 6 exceeds a preset value, so as to ensure the safety of the experimental personnel.

[0051] It should be noted that the various embodiments in this specification are described in a progressive manner, with each embodiment focusing on the differences from other embodiments. The same or similar parts between the various embodiments can be referred to each other.

[0052] It should also be noted that, in this document, the terms "center," "upper," "lower," "left," "right," "vertical," "horizontal," "inner," and "outer," etc., indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, and are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application. Furthermore, 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 these entities or operations, nor should they be construed as indicating or implying relative importance. Moreover, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or terminal device that comprises a list of elements includes not only those elements, but also other elements not expressly listed, or elements inherent to such a process, method, article, or terminal device. In the absence of further restrictions, an element defined by the phrase "includes a..." does not exclude the presence of other identical elements in the process, method, article, or terminal device that includes the element.

[0053] The technical solutions provided in this application have been described in detail above. Specific examples have been used to illustrate the principles and implementation methods of this application. The descriptions of the above embodiments are only for the purpose of helping to understand this application, and the content of this specification should not be construed as a limitation of this application. Furthermore, for those skilled in the art, there will be different forms of changes in the specific implementation methods and application scope based on this application. It is neither necessary nor possible to exhaustively list all implementation methods here, and obvious changes or modifications derived therefrom are still within the protection scope of this application.

Claims

1. An experimental apparatus for salt rock creep under high-pressure hydrogen environment, characterized in that, include: The cavity has openings at its top and sides, and a top cover and a side cover for closing the two openings respectively. The side cover is provided with an observation window. An air injection hole and an air exhaust hole are provided on the side wall of the cavity on the side opposite to the side cover. The height of the air injection hole is higher than that of the air exhaust hole. An experimental assembly structure is disposed within the cavity. The experimental assembly structure includes a sample placement stage, a limiting component, and a loading rod with a lead block at one end. The limiting component is disposed above the sample placement stage, and the loading rod is disposed on the limiting component. The end of the loading rod away from the lead block faces the sample placement stage. The limiting component is used to restrict the loading rod from applying a load towards the sample placement stage in the vertical direction. A gas injection and recovery system is installed on one side of the cavity for injecting high-pressure hydrogen into the cavity and recovering high-pressure hydrogen from the cavity. The imaging system is located on one side of the cavity where the side cover is located, and includes an imaging device and a light source. The light source emits light into the cavity through the observation window, and the imaging device is positioned facing the observation window.

2. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: The limiting component includes multiple legs and multiple limiting plates disposed on the legs. The multiple limiting plates are arranged at intervals in a vertical direction, and each limiting plate has a through hole. The loading rod passes through the through hole of the multiple limiting plates.

3. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: The loading rod includes a first part, a second part, and a third part connected in sequence. The third part is located close to the sample placement stage, the second part is connected to the limiting component, and the diameter of the third part is smaller than the diameter of the second part.

4. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 3, characterized in that: The loading rod is provided with a loading disk, which is located between the first part and the second part, and the loading disk is located on the side of the limiting component away from the sample placement stage. The lead block is placed on the loading disk.

5. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: The gas injection recovery system includes a first gas source, which is connected to the gas injection port through a first pipeline. A first valve and a booster are provided on the first pipeline. The gas injection recovery system also includes an air compressor and a collector, wherein the air compressor is connected to the booster and the collector is connected to the exhaust port of the cavity; The first gas source is hydrogen.

6. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 5, characterized in that: The gas injection recovery system also includes a second gas source, which is connected to the gas injection port through a second pipeline, and a second valve is provided on the second pipeline. The second gas source is helium.

7. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 6, characterized in that: A third valve is provided on the first pipeline, and the third valve is located between the booster and the cavity.

8. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: The salt rock creep experimental device also includes a safety shield, which is disposed on the outside of the cavity and surrounds the cavity. The safety shield is equipped with a hydrogen monitoring and alarm device, which is used to issue an alarm when the hydrogen concentration inside the safety shield exceeds a preset value.

9. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: An octagonal pad is provided between the top cover and the opening at the top of the cavity, and the top cover is in close contact with the octagonal pad.

10. The experimental apparatus for salt rock creep under high-pressure hydrogen environment according to claim 1, characterized in that: The materials of the sample placement stage, the limiting component, and the loading rod include stainless steel.

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