An underground hydrogen production storage and transportation system

Abstract

The application belongs to the field of underground hydrogen production, and particularly relates to a hydrogen storage and transportation system for underground hydrogen production, which comprises a hydrogen storage space in communication with a hydrogen production stratum for storing hydrogen, the inner wall of the hydrogen storage space is provided with a sealing isolation layer for sealing and isolating hydrogen in the hydrogen storage space; a purification device, which is in communication with the hydrogen production stratum and the hydrogen storage space respectively, can purify hydrogen produced by the hydrogen production stratum and transport the hydrogen into the hydrogen storage space; and the system further comprises a gas recycling device, which can receive and store inert gas separated in the process of purifying hydrogen by the purification device, and can transport the inert gas into the hydrogen production stratum for oil-water interface pretreatment and / or transport the inert gas into the hydrogen storage space for a cushion layer. The above scheme can reduce hydrogen loss caused by biochemical reactions, improve the volume hydrogen storage efficiency and the utilization efficiency of byproduct gas, and has significant economic and safety.

Description

Technical Field

[0001] This invention belongs to the field of underground hydrogen production technology, specifically relating to an underground hydrogen production storage and transportation system. Background Technology

[0002] The excessive use of fossil fuels has led to excessive carbon dioxide emissions, and the resulting global warming has made the energy transition a critical global issue. Hydrogen is the most abundant element in nature, with a wide range of sources. One cubic meter of hydrogen produces 12.7 megajoules of energy through combustion, while one cubic meter of methane produces 40 megajoules of heat. Although hydrogen has a low calorific value, it has the highest specific energy among all fuels, and the final product of hydrogen in fuel cells or combustion is water, with no carbon dioxide or other pollutants emitted during the process. Therefore, hydrogen energy is considered the best clean energy source for the future and has great development potential. Using the non-recurring electricity generated from renewable energy sources such as solar, wind, hydro, and geothermal energy for hydrogen production through water electrolysis, storage, and stable supply is one of the important solutions to mitigate global warming and its negative impacts.

[0003] However, hydrogen has a low energy density, making its storage a global challenge, especially for large-scale storage. Due to significant losses during hydrogen liquefaction, the process is complex and costly, making compressed gaseous storage the only viable option for large-scale hydrogen storage. Compared to above-ground storage, underground hydrogen storage offers advantages in terms of safety, environmental friendliness, storage capacity, and investment costs. Furthermore, underground hydrogen storage can ensure national energy security, fully utilize underground storage space, and play a crucial role in improving energy efficiency, reducing emissions, lowering storage costs, peak shaving, and ensuring a safe and stable gas supply.

[0004] The scheme disclosed in Chinese invention patent (CN108529124A) involves preparatory work such as geological selection, tubing material selection, cavity airtightness testing, and stability and airtightness analysis and evaluation to store hydrogen in a salt cavern cavity. This method can prevent problems such as hydrogen leakage and hydrogen embrittlement of tubing materials that may occur during salt cavern hydrogen storage. However, salt cavern cavities have high requirements for geological conditions, requiring the existence of a very thick salt dome stratum for cavity operation. It is evident that existing underground hydrogen storage methods suffer from problems such as significant hydrogen loss or being constrained by geological conditions. For the underground hydrogen production industry, the geological conditions of hydrogen-producing strata are usually insufficient to meet the requirement of immediate production and storage. Furthermore, transporting and storing the produced hydrogen after extraction will cause certain losses during the transportation process, and the extraction and transportation processes also consume certain resources.

[0005] Therefore, there is an urgent need to provide a new method for hydrogen storage and transportation to solve the aforementioned problems in existing technologies. Summary of the Invention

[0006] The purpose of this invention is to provide a storage and transportation system for underground hydrogen production, in order to solve the problem that the geological conditions of hydrogen-producing strata in the existing underground hydrogen production industry are usually unable to meet the requirements of immediate production and storage, and that hydrogen transfer and storage will cause gas loss and cost consumption.

[0007] To achieve the above objectives, the present invention provides an underground hydrogen production and storage system, comprising a hydrogen transportation system and a hydrogen storage space connected to the hydrogen-producing geological layer for storing hydrogen. The inner wall of the hydrogen storage space is provided with a sealing isolation layer for sealing and isolating the hydrogen within the hydrogen storage space. A purification device is connected to both the hydrogen-producing geological layer and the hydrogen storage space, and the purification device is capable of purifying the hydrogen produced by the hydrogen-producing geological layer and transporting it to the hydrogen storage space.

[0008] It also includes a gas recycling device, which is connected to the hydrogen delivery system, the purification device, the hydrogen storage space and the hydrogen-producing reservoir. The gas recycling device can receive and store the inert gas separated during the hydrogen purification process of the purification device. The gas recycling device can transport the inert gas to the oil-water interface in the hydrogen-producing reservoir and continuously introduce inert gas for improvement treatment, so as to achieve oil-water interface pretreatment.

[0009] The hydrogen delivery system, in conjunction with the gas recycling device, can inject an iron ion solution into the hydrogen-producing reservoir for sterilization, and then introduce a reducing gas into the oil-water interface to achieve pre-sterilization treatment; the hydrogen delivery system, in conjunction with the gas recycling device, can inject hydrogen-producing bacteria into the hydrogen-producing reservoir while maintaining the introduction of inert gas.

[0010] And / or, the gas recycling device can deliver the inert gas to the hydrogen storage space for use as a padding layer, so as to stabilize the pressure inside the hydrogen storage space.

[0011] In a preferred embodiment of this application, the hydrogen storage space is formed by modifying a depleted / abandoned oil reservoir, and the hydrogen storage space is located adjacent to the hydrogen-producing reservoir.

[0012] In a preferred embodiment of this application, the sealing isolation layer includes a sealing layer and an isolation layer. The isolation layer is disposed between the sealing layer and the rock wall of the depleted / abandoned oil reservoir, and the sealing layer is fixed to the rock wall of the depleted / abandoned oil reservoir through the isolation layer.

[0013] In a preferred embodiment of this application, the sealing layer is a steel sealing layer, and the isolation layer includes a connecting layer and a skeleton layer arranged sequentially from the inside out. The skeleton layer is fixedly connected to the rock wall of the depleted / abandoned oil reservoir, and the sealing layer is locked and fixed to the skeleton layer through the connecting layer.

[0014] In a preferred embodiment of this application, the steel sealing layer is made of L80 steel.

[0015] In a preferred embodiment of this application, the hydrogen storage space is further provided with a drainage and exhaust system, which includes a gas collection pipe, an exhaust pipe and a drainage pipe. The gas collection pipe includes an annular gas collection pipe, which is arranged horizontally inside the hydrogen storage space. The exhaust pipe connects the annular gas collection pipe and the ground exhaust gas treatment device, and extends vertically.

[0016] As a preferred embodiment of this application, it also includes a hydrogen delivery system, which includes a vertical shaft and a gas extraction pipe and an injection pipe connected to the vertical shaft. The bottom end of the vertical shaft is connected to the hydrogen storage space in the vertical direction, and the top end of the vertical shaft is located on the ground surface and can be connected to the hydrogen transmission network through the gas extraction pipe.

[0017] In a preferred embodiment of this application, a sealing connection device is provided at the top of the shaft. The sealing connection device is provided with a gas sampling interface and a gas injection interface. The gas sampling pipe is sealed to the sealing connection device through the gas sampling interface. The gas injection pipe is sealed to the sealing connection device through the gas injection structure. The gas recycling device is connected to the gas injection pipe.

[0018] As a preferred embodiment of this application, a maintenance system is also included, comprising a detection unit and a maintenance unit; the detection unit is connected to the hydrogen-producing reservoir, the hydrogen storage space, the hydrogen recycling device, and the hydrogen delivery system, respectively, for monitoring the internal operating conditions of the hydrogen-producing reservoir, the hydrogen storage space, and the hydrogen delivery system; the maintenance unit includes a maintenance tunnel for maintenance personnel and equipment to enter and exit, and a construction tunnel for operations, the top of the maintenance tunnel being connected to the vertical shaft, and the construction tunnel being connected to the maintenance tunnel.

[0019] In a preferred embodiment of this application, the detection unit includes a monitoring component and a ground receiving terminal connected to the monitoring component; the monitoring component includes multiple sensors distributed inside the hydrogen-producing reservoir and around the inner and outer sides of the sealing layer; the sensors include at least a pressure sensor for monitoring the pressure inside the hydrogen-producing reservoir and the hydrogen storage space, a gas sensor for monitoring the concentration of gas components inside the hydrogen-producing reservoir and the hydrogen storage space, a bioactive sensor for monitoring the activity of hydrogen-producing bacteria inside the hydrogen-producing reservoir, and a water level sensor for monitoring the groundwater level inside the hydrogen-producing reservoir.

[0020] Due to the adoption of the above technical solution, the beneficial effects achieved by this application are as follows:

[0021] 1. The underground hydrogen production and storage system in this application enables the immediate production and storage of underground hydrogen, and also enables large-scale hydrogen storage. The sealed isolation layer can minimize hydrogen loss caused by biochemical reactions and improve volumetric hydrogen storage efficiency. Moreover, it has low requirements for geological conditions, has significant site selection flexibility, and is not constrained by thick salt rock strata, thus exhibiting significant economic and safety advantages.

[0022] 2. By coordinating gas recovery devices and injection pipes, byproducts or excess inert gases generated during hydrogen production can be reused. This not only assists in the pretreatment of the oil-water interface in the reservoir, thereby improving the contact between the oil and water layers, reducing the contact distance between hydrogen-producing bacteria and the oil layer, and increasing the efficiency of hydrogen-producing bacteria in utilizing hydrocarbons in crude oil to produce hydrogen, but also serves as a hydrogen cushion layer in the hydrogen storage space, ensuring the safety of hydrogen storage. Simultaneously, the above scheme also improves gas utilization efficiency. Furthermore, the gas recovery device in this application can also be coordinated with a hydrogen delivery system to achieve sterilization pretreatment of the hydrogen-producing reservoir and the injection of hydrogen-producing bacteria.

[0023] 3. By setting up the maintenance system, it is possible to accurately monitor the hydrogen production conditions within the hydrogen-producing reservoir, as well as the conditions of the hydrogen storage space and the hydrogen transportation system. This allows for convenient adaptation and adjustment of the underground hydrogen production system and the aforementioned storage and transportation system based on actual production conditions, ensuring the safe, stable, and efficient operation of hydrogen production, storage, and transportation. Attached Figure Description

[0024] The accompanying drawings, which are included to provide a further understanding of the invention and form part of this invention, illustrate exemplary embodiments of the invention and are used to explain the invention, but do not constitute an undue limitation of the invention. In the drawings:

[0025] Figure 1 This is a schematic diagram of the underground hydrogen production storage and transportation system in this invention;

[0026] Figure 2 This is a schematic diagram of the sealing and isolation layer in this invention;

[0027] Figure 3 This is a schematic diagram of the vertical shaft portion in this invention;

[0028] Figure 4 This is a schematic diagram of the electrical control system for the underground hydrogen production and storage system in this invention.

[0029] List of components and reference numerals:

[0030] 1. Hydrogen-producing reservoir;

[0031] 21 Hydrogen storage space, 22 Hydrogen delivery system, 221 Shaft, 222 Gas collection pipe, 223 Gas injection pipe, 224 Sealing connection device, 225 Gas collection interface, 226 Gas injection interface, 231 Detection unit, 232 Maintenance unit, 233 Maintenance roadway, 234 Construction roadway, 235 Monitoring components, 236 Ground receiving end;

[0032] 3. Purification device;

[0033] 4. Gas recovery device;

[0034] 5 sealing and isolation layer, 51 sealing layer, 52 isolation layer, 521 skeleton layer, 522 connecting layer;

[0035] 6. Drainage and exhaust system; 61. Annular gas collection pipe; 62. Exhaust pipe; 63. Ground exhaust gas treatment device.

[0036] 7. Rock wall. Detailed Implementation

[0037] To more clearly illustrate the overall concept of the present invention, a detailed description will be provided below with reference to the accompanying drawings and examples.

[0038] It should be noted that many specific details are set forth in the following description in order to provide a full understanding of the present invention. However, the present invention may also be implemented in other ways different from those described herein. Therefore, the scope of protection of the present invention is not limited to the specific embodiments disclosed below.

[0039] like Figure 1-4 As shown, this application discloses a hydrogen storage and transportation device for underground hydrogen production, adapted to underground hydrogen production processes utilizing underground abandoned oil reservoirs. It mainly includes a hydrogen storage space 21 connected to the hydrogen-producing reservoir 1 for storing hydrogen. The hydrogen storage space 21 is formed by modifying a depleted / abandoned oil reservoir and is located adjacent to the hydrogen-producing reservoir 1. A sealing isolation layer 5 is provided on the inner wall of the hydrogen storage space 21 to seal and isolate the hydrogen within it. A purification device 3 is also disclosed, connected to both the hydrogen-producing reservoir 1 and the hydrogen storage space 21. The purification unit 3 can purify the hydrogen produced by the hydrogen-producing reservoir 1 and transport it to the hydrogen storage space 21; it also includes a gas recovery unit 4, which is connected to the purification unit 3, the hydrogen storage space 21 and the hydrogen-producing reservoir 1 respectively; the gas recovery unit 4 can receive and store the inert gas separated during the hydrogen purification process of the purification unit 3; the gas recovery unit 4 can transport the inert gas to the hydrogen-producing reservoir 1 for oil-water interface pretreatment, and / or the gas recovery unit 4 can transport the inert gas to the hydrogen storage space 21 for the cushion layer.

[0040] In the above-mentioned scheme, the underground hydrogen production and storage system enables on-site hydrogen production and storage, and large-scale hydrogen storage. The sealed isolation layer 5 minimizes hydrogen loss due to biochemical reactions, improving volumetric hydrogen storage efficiency. Furthermore, it has low requirements for geological conditions, offering significant site selection flexibility and is not constrained by thick salt rock strata, resulting in significant economic and safety advantages. Simultaneously, the gas recovery device 4 can recover byproducts or excess inert gases from the hydrogen production process. This not only assists in the pretreatment of the oil-water interface in the reservoir, improving the contact between the oil and water layers, reducing the contact distance between hydrogen-producing bacteria and the oil layer, and increasing the efficiency of hydrogen-producing bacteria in utilizing hydrocarbons in crude oil to produce hydrogen, but also serves as a hydrogen cushion layer in the hydrogen storage space 21, ensuring the safety of hydrogen storage. This scheme also improves gas utilization efficiency.

[0041] Furthermore, referring to Figure 2 As shown, the sealing isolation layer 5 includes a sealing layer 51 and an isolation layer 52. The isolation layer 52 is disposed between the sealing layer 51 and the rock wall 7 of the depleted / abandoned oil reservoir. The sealing layer 51 is fixed to the rock wall 7 of the depleted / abandoned oil reservoir through the isolation layer 52. In a preferred example, the sealing layer 51 is a steel sealing layer 51 welded from L80 steel, which can play a sealing role to prevent hydrogen leakage. Moreover, L80 steel has no obvious hydrogen embrittlement sensitivity when storing hydrogen at low pressure (3-5 MPa) at room temperature, which can ensure the long-term stable use of the sealing layer 51. The isolation layer 52 includes a connecting layer 522 and a skeleton layer 521 arranged sequentially from the inside to the outside. The skeleton layer 521 is a reinforced concrete layer with steel bars as the skeleton. The steel bar skeleton extends into the rock wall 7 of the depleted / abandoned oil reservoir and is fixed and locked to the rock wall 7. The connecting layer 522 is arranged close to the sealing layer 51 and is connected to the steel sealing layer 51 by welding. Through the above-mentioned structure, the isolation layer 52 can effectively support and protect the steel sealing layer 51, which is conducive to ensuring the structural strength of the entire hydrogen storage space 21.

[0042] Furthermore, referring to Figure 1-4 As shown, the hydrogen storage space 21 is also equipped with a drainage and exhaust system 6 and a hydrogen delivery system 22; the drainage and exhaust system 6 includes a gas collection pipe, an exhaust pipe 62, and a drainage pipe. In a preferred example, refer to... Figure 1-3 As shown, the gas collection pipe includes an annular gas collection pipe 61, which is horizontally positioned inside the hydrogen storage space 21. An exhaust pipe 62 connects the annular gas collection pipe 61 to the ground-based exhaust gas treatment device 63, extending vertically. The annular gas collection pipe 61 collects impurities from the hydrogen storage space 21 and transports them through the exhaust pipe 62 to the ground-based exhaust gas treatment device 63 for harmless discharge, ensuring hydrogen storage safety while improving environmental performance.

[0043] Furthermore, referring to Figure 1 As shown, the underground hydrogen production and storage system in this application also includes a hydrogen transportation system 22. The hydrogen transportation system 22 includes a shaft 221 and a gas extraction pipe 222 and an injection pipe 223 connected to the shaft 221. The bottom end of the vertical shaft 221 is connected to the hydrogen storage space 21, and the top end of the shaft 221 is located on the ground surface and can be connected to the hydrogen transmission network through the gas extraction pipe 222. The gas extraction pipe 222 is used to extract the hydrogen stored in the hydrogen storage space 21 and transport it to the hydrogen pipeline network for subsequent hydrogen packaging and transportation. The gas injection pipe 223, together with the aforementioned gas recycling device 4, can realize hydrogen production treatment operations such as nitrogen and sulfur dioxide in the hydrogen-producing reservoir 1. It can also realize the injection of iron ion solution into the hydrogen-producing reservoir 1 for sterilization treatment. Afterwards, reducing gas is introduced into the oil-water interface in the reservoir to realize sterilization pretreatment before hydrogen production. It can also realize the injection of hydrogen-producing bacteria and the introduction of nitrogen into the hydrogen storage space 21 to realize cushion gas operation to ensure hydrogen storage safety and facilitate hydrogen extraction.

[0044] Continue to refer to Figure 1 As shown, a sealing connection device 224 is provided at the top of the vertical shaft 221. The sealing connection device 224 is provided with a gas sampling interface 225 and a gas injection interface 226. The gas sampling pipe 222 is sealed to the sealing connection device 224 through the gas sampling interface 225; the gas injection pipe 223 is sealed to the sealing connection device 224 through a gas injection structure, and the gas recycling device 4 is connected to the gas injection pipe 223. It should be noted that this application does not specifically limit the specific structure of the sealing connection device 224, which can be selected according to the working needs, such as a sealing cover, sealing flange, etc.

[0045] Furthermore, the underground hydrogen production storage and transportation system in this application also includes a maintenance system, which includes a detection unit 231 and a maintenance unit 232. The detection unit 231 is connected to the hydrogen production reservoir 1, the hydrogen storage space 21, and the hydrogen transportation system 22 of the gas recovery device 4, respectively, and is used to monitor the internal working conditions of the hydrogen production reservoir 1, the hydrogen storage space 21, and the hydrogen transportation system 22 of the gas recovery device 4. The maintenance unit 232 includes a maintenance tunnel 233 for maintenance personnel and equipment to enter and exit, and a construction tunnel 234 for operations. The top of the maintenance tunnel 233 is connected to the vertical shaft 221, and the construction tunnel 234 is connected to the maintenance... The protective tunnel 233 is connected; the detection unit 231 includes a monitoring component 235 and a ground receiving end 236 connected to the monitoring component 235; the monitoring component 235 includes multiple sensors, which are distributed inside the hydrogen-producing reservoir 1 and around the inner and outer sides of the sealing layer 51; the sensors include at least a pressure sensor for monitoring the pressure inside the hydrogen-producing reservoir 1 and the hydrogen storage space 21, a gas sensor for monitoring the concentration of gas components inside the hydrogen-producing reservoir 1 and the hydrogen storage space 21, a bioactive sensor for monitoring the activity of hydrogen-producing bacteria inside the hydrogen-producing reservoir 1, and a water level sensor for monitoring the groundwater inside the hydrogen-producing reservoir 1. By adopting the above structure, the hydrogen production conditions inside the hydrogen-producing reservoir 1 and the operating conditions of the hydrogen storage space 21 and the hydrogen transportation system 22 can be accurately monitored, thereby facilitating the adaptation and adjustment of the underground hydrogen production system and the above-mentioned storage and transportation system according to the actual production situation, ensuring the safe, stable, and efficient operation of hydrogen production, hydrogen storage, and hydrogen transportation.

[0046] The underground hydrogen production storage and transportation system described in this application is well-suited for hydrogen production processes in abandoned / depleted oil reservoirs. It facilitates a series of operations, including pre-sterilization treatment, oil-water interface pre-treatment, injection of hydrogen-producing bacteria, hydrogen purification after fermentation, and meeting the anaerobic environment requirements of the hydrogen-producing bacteria. It also enables on-demand storage, avoiding the need for separate storage space and / or the construction of long-distance pipelines, thus offering good economic efficiency and safety. Furthermore, it enables gas reuse during the underground hydrogen production process, improving gas utilization efficiency, reducing emissions, and enhancing environmental performance.

[0047] The technical solutions protected by this invention are not limited to the above embodiments. It should be noted that any combination of the technical solutions of any embodiment with one or more other embodiments is within the protection scope of this invention. Although the invention has been described in detail above with general descriptions and specific embodiments, some modifications or improvements can be made to it, which will be obvious to those skilled in the art. Therefore, all such modifications or improvements made without departing from the spirit of this invention are within the scope of protection claimed by this invention.

Claims

1. An underground hydrogen production and storage system characterized by, The hydrogen delivery system and the hydrogen storage space in communication with the hydrogen production layer for storing hydrogen, the inner wall of the hydrogen storage space is provided with a sealed isolation layer for sealing and isolating the hydrogen in the hydrogen storage space; a purification device, the purification device is respectively in communication with the hydrogen production layer and the hydrogen storage space, the purification device can purify the hydrogen produced by the hydrogen production layer and deliver it to the hydrogen storage space; Also includes a gas recycling device, the gas recycling device is respectively in communication with the hydrogen delivery system, the purification device, the hydrogen storage space and the hydrogen production layer; the gas recycling device can receive and store the inert gas separated in the process of purifying hydrogen by the purification device, the gas recycling device can deliver the inert gas to the oil-water interface in the hydrogen production layer to continuously introduce inert gas for improvement processing, to realize the pretreatment of oil-water interface; The hydrogen delivery system can inject iron ion solution into the hydrogen production layer for sterilization treatment by cooperating with the gas recycling device, and then introduce reducing gas to the oil-water interface to realize sterilization pretreatment; the hydrogen delivery system can inject hydrogen producing bacteria into the hydrogen production layer while maintaining the introduction of inert gas by cooperating with the gas recycling device; And / or, the gas recycling device can deliver the inert gas to the hydrogen storage space for cushioning, so that the pressure inside the hydrogen storage space is stable.

2. The underground hydrogen production and storage system of claim 1, wherein The hydrogen storage space is formed by modifying the depleted / abandoned oil reservoir layer, and the hydrogen storage space is arranged adjacent to the hydrogen production layer.

3. The underground hydrogen production and storage system of claim 2, wherein The sealing and isolation layer includes a sealing layer and an isolation layer, the isolation layer is arranged between the sealing layer and the rock wall of the depleted / abandoned oil reservoir layer, and the sealing layer is fixed on the rock wall of the depleted / abandoned oil reservoir layer through the isolation layer.

4. The underground hydrogen production and storage system of claim 3, wherein The sealing layer is a steel sealing layer, the isolation layer includes a connecting layer and a skeleton layer arranged in sequence from inside to outside, the skeleton layer is fixedly connected with the rock wall of the depleted / abandoned oil reservoir layer, and the sealing layer is locked and fixed with the skeleton layer through the connecting layer.

5. The underground hydrogen production and storage system of claim 4, wherein The steel sealing layer is made of L80 steel material.

6. The underground hydrogen production and storage system of claim 4, wherein The hydrogen storage space is also provided with a drainage and exhaust system, the drainage and exhaust system includes a gas collecting pipe, an exhaust pipe and a drainage pipe, the gas collecting pipe includes an annular gas collecting pipe, the annular gas collecting pipe is arranged inside the hydrogen storage space along the horizontal direction, the exhaust pipe is in communication with the annular gas collecting pipe and a ground exhaust treatment device, and the exhaust pipe extends along the vertical direction.

7. The underground hydrogen producing storage and transportation system of claim 4, wherein, Also includes a hydrogen delivery system, the hydrogen delivery system includes a vertical shaft, a gas extraction pipe and a gas injection pipe in communication with the vertical shaft, the bottom end of the vertical shaft is in communication with the hydrogen storage space along the vertical direction, and the top end of the vertical shaft is located on the ground and can be in communication with a hydrogen delivery pipe network through the gas extraction pipe.

8. The underground hydrogen producing storage and transportation system of claim 7, wherein, The top end of the vertical shaft is provided with a sealing connection device, the sealing connection device is provided with a gas extraction interface and a gas injection interface, the gas extraction pipe is sealingly connected with the sealing connection device through the gas extraction interface; the gas injection pipe is sealingly connected with the sealing connection device through the gas injection structure, and the gas recycling device is in communication with the gas injection pipe.

9. The underground hydrogen producing storage and transportation system of claim 8, wherein, The system further comprises a maintenance system, which comprises a detection unit and a maintenance unit; the detection unit is connected with the hydrogen production stratum, the hydrogen storage space, the gas recycling device and the hydrogen delivery system respectively, and is used for monitoring the internal working conditions of the hydrogen production stratum, the hydrogen storage space, the gas recycling device and the hydrogen delivery system; the maintenance unit comprises a maintenance roadway for the entry and exit of maintenance personnel and maintenance equipment and a construction roadway for operation, the top end of the maintenance roadway is connected with the vertical shaft, and the construction roadway is connected with the maintenance roadway.

10. The underground hydrogen producing storage and transportation system of claim 9, wherein, The detection unit comprises a monitoring assembly and a ground receiving end connected with the monitoring assembly; the monitoring assembly comprises a plurality of sensors, which are distributed inside the hydrogen production stratum and around the inside and outside of the sealing layer; the sensors at least comprise a pressure sensor for monitoring the internal pressure of the hydrogen production stratum and the hydrogen storage space, a gas sensor for monitoring the gas component concentration inside the hydrogen production stratum and the hydrogen storage space, a biological activity sensor for monitoring the hydrogen production bacteria activity inside the hydrogen production stratum, and a water level sensor for monitoring the underground water in the hydrogen production stratum.

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