A cave hydrogen storage structure

Abstract

This invention provides a cavern hydrogen storage structure, including a lining and sealing structure, multiple internal support components, and multiple sealing structures. The lining and sealing structure is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures are spaced apart along the axial direction of the lining and sealing structure, dividing the closed storage space into independent storage units. The multiple internal support components are spaced apart within each storage unit and fixed to the inner wall of the lining and sealing structure to support it. The cavern hydrogen storage structure proposed in this invention uses a lining and sealing structure fixed to the inner wall of the cavern to form a closed storage space. The multiple sealing structures are spaced apart along the axial direction of the lining and sealing structure, dividing the closed storage space into independent storage units. Each storage unit can have a different gas storage pressure and can store a different gas, effectively addressing various gas usage scenarios and pressure requirements.

Description

Technical Field

[0001] This invention relates to the field of cave hydrogen storage technology, and in particular to a cave hydrogen storage structure. Background Technology

[0002] Underground cavern hydrogen storage technology, as an innovative technology with enormous potential in the fields of energy storage and clean energy transition, has attracted widespread research and attention in recent years. Its technological background can be traced back to the recognition of hydrogen as an efficient and clean energy carrier, and the increasing demand for the integration and storage of renewable energy. Against the backdrop of current global energy challenges and climate change, underground cavern hydrogen storage technology has enormous potential to address the volatility of renewable energy, provide stability in energy supply, and reduce carbon emissions. Therefore, the research and development of underground cavern hydrogen storage technology has become an important topic in the energy industry and the scientific community, and its technological background and development trends are attracting considerable attention.

[0003] However, underground cavern hydrogen storage, as an emerging energy storage technology, has some distinct advantages and disadvantages. Firstly, on the advantage side, underground cavern hydrogen storage can effectively address the intermittent supply problem of renewable energy. By using surplus electricity to electrolyze water to produce hydrogen during periods of energy abundance and storing the hydrogen in caverns, hydrogen can be released for energy use during peak demand periods. Furthermore, cavern hydrogen storage allows for long-term hydrogen storage because hydrogen is relatively stable in caverns and less prone to leakage. This technology also has the potential to improve the sustainability of energy systems and reduce dependence on fossil fuels.

[0004] However, underground cavern hydrogen storage also has some disadvantages. First, the cost of constructing and maintaining hydrogen storage caverns is relatively high, requiring rock mining, geological surveys, and ensuring the safety of the hydrogen storage system. Due to the characteristics of large caverns and difficult site selection, there are not many suitable sites for building hydrogen storage facilities. Often, single cavern gas storage facilities are built, and the storage pressure is relatively uniform, making it difficult to meet the demand for efficient filling and releasing of gas under multiple pressure levels. Summary of the Invention

[0005] Therefore, it is necessary to provide a cavern hydrogen storage structure that can effectively solve the problem of relatively single storage pressure.

[0006] A cavern hydrogen storage structure includes: a lining sealing structure, multiple internal support components, and multiple sealing structures. The lining sealing structure is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures are spaced apart along the axial direction of the lining sealing structure, dividing the closed storage space into independent storage units. The multiple internal support components are spaced apart in each storage unit and are fixed to the inner wall of the lining sealing structure to support the lining sealing structure.

[0007] Optionally, the lining sealing structure includes, from the outside to the inside, a surrounding rock concrete lining layer, an asphalt-mixed sliding layer, a steel lining layer, an epoxy resin sealing layer, a hydrogen permeation prevention coating, and a prestressed polymer polyester film. The prestressed polymer polyester film is connected to the inner support component, which is used to adjust the tension of the prestressed polymer polyester film.

[0008] Optionally, the epoxy resin sealing layer anti-hydrogen leakage coating uses a bisphenol A type epoxy resin matrix and is doped with 5% by mass of alumina and 5% by mass of zirconium oxide nanosheets.

[0009] Optionally, the inner support component includes a control component and multiple inner support components. The inner support components are arranged around the control component. One end of the inner support component is fixed to the control component, and the other end abuts against the lining sealing structure. The control component is connected to the inner support component and can drive the inner support component to extend and retract to adjust the length of the inner support component.

[0010] Optionally, a vibration assembly is included. The inner support assembly includes a first connecting rod, a second connecting rod, a washer, and a cylinder. One end of the first connecting rod is fixed to the control assembly, and the other end of the first connecting rod is sleeved on the second connecting rod. The cylinder is fixed inside the first connecting rod, and the movable end of the cylinder is fixed to the second connecting rod. The cylinder is connected to the control assembly, and the washer is fixed on the other end of the second connecting rod.

[0011] Optionally, the gasket has an opening to embed the prestressed high-polymer polyester film. The second connecting rod contains a winch, a pressure sensor, and a tension meter. The pressure sensor contacts the gasket, and the tension meter and the movable end of the winch are connected to the prestressed high-polymer polyester film. The pressure sensor, the tension meter, and the winch are connected to the control component. The tension meter is used to detect the tension of the prestressed high-polymer polyester film. The control component receives the detected pressure and tension results, drives the cylinder to extend and retract to adjust the pressure between the gasket and the lining sealing structure, and drives the winch to rotate to adjust the tension of the prestressed high-polymer polyester film.

[0012] Optionally, the sealing structure includes a pair of oppositely arranged and independent sealing doors, which are used to close the storage unit adjacent to the sealing doors.

[0013] Optionally, the sealed door includes a door frame, a door body, a movable component, an airbag, and an inflation / deflation assembly. The door frame is fixed to the lining sealing structure. The door frame has a hole communicating with the storage unit. The movable component is fixed to the door frame. The door body is fixed to the movable component. The movable component can drive the door body to move relative to the door frame, so that the door body has a closed state that fills and seals the hole and an open state that allows the hole to communicate with the outside. The airbag is embedded in the inner wall of the hole and connected to the inflation / deflation assembly via a pipe. The inflation / deflation assembly is used to inflate the airbag to form a seal between the door body and the door frame when the door is in the closed state, or to deflate the airbag to disengage the seal between the door body and the door frame when the door is in the closed state.

[0014] Optionally, the moving component includes a horizontal moving robotic arm and a vertical moving robotic arm. The vertical moving robotic arm is fixed to the door frame. The horizontal moving robotic arm is fixed to the movable end of the vertical moving robotic arm. The movable end of the horizontal moving robotic arm is fixed to the door body. The horizontal moving robotic arm is used to drive the door body to move horizontally. The vertical moving robotic arm is used to drive the horizontal moving robotic arm and the door body to move vertically.

[0015] Optionally, the sealing structure further includes a concrete filling ring, a circumferential fastening bolt, and an axial fastening bolt. The concrete filling ring fills the space between a pair of sealing doors and is fixed to the lining sealing structure. The circumferential fastening bolt is fixed radially along the concrete filling ring, with one end of the circumferential fastening bolt embedded in the lining sealing structure. The axial fastening bolt is fixed axially along the concrete filling ring, with one end of the axial fastening bolt embedded in the lining sealing structure.

[0016] The beneficial effects of this invention are as follows:

[0017] The proposed cavern hydrogen storage structure includes a lining and sealing structure, multiple internal support components, and multiple sealing structures. The lining and sealing structure is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures are spaced apart along the axial direction of the lining and sealing structure, dividing the closed storage space into independent storage units. Each storage unit can have a different gas storage pressure and can store a different gas, which can effectively cope with various gas usage scenarios and rapid refueling requirements at various pressures. Attached Figure Description

[0018] To more clearly illustrate the technical solutions in the embodiments of the present invention, the accompanying drawings used in the description of the embodiments will be briefly introduced below. Obviously, the accompanying drawings described below are only some embodiments of the present invention. For those skilled in the art, other drawings can be obtained based on these drawings without creative effort.

[0019] Figure 1 This is a schematic diagram of the cave hydrogen storage structure in this invention;

[0020] Figure 2 This is a cross-sectional schematic diagram of the cave hydrogen storage structure in this invention;

[0021] Figure 3 for Figure 1 Schematic diagram of the internal support component;

[0022] Figure 4 for Figure 1 Schematic diagram of the central sealing structure;

[0023] Figure 5 for Figure 2 Enlarged schematic diagram of the connection between the central sealing structure and the lining sealing structure;

[0024] Wherein: 1-lining sealing structure, 11-surrounding rock concrete lining layer, 12-asphalt mixed sliding layer, 13-steel lining layer, 14-epoxy resin sealing layer anti-hydrogen leakage coating, 15-prestressed high-molecular polyester film, 2-internal support component, 21-control component, 22-internal support component, 221-first connecting rod, 222-second connecting rod, 223-gasket, 3-sealing structure, 31-sealing door, 311-door frame, 312-door body, 313-moving component, 314-airbag, 315-inflation and deflation component, 316-boob, 32-concrete filling ring, 321-pipeline channel, 33-circumferential fastening bolt, 34-axial fastening bolt. Detailed Implementation

[0025] Preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which form part of this application and are used together with the embodiments of the present invention to illustrate the principles of the present invention, but are not intended to limit the scope of the present invention.

[0026] like Figure 1-5 As shown, an embodiment of the present invention provides a cave hydrogen storage structure for storing hydrogen gas inside a cave, comprising:

[0027] The system comprises a lining sealing structure 1, multiple internal support components 2, and multiple sealing structures 3. The lining sealing structure 1 is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures 3 are spaced apart along the axial direction of the lining sealing structure 1, dividing the closed storage space into independent storage units. The multiple internal support components 2 are spaced apart in each storage unit and are fixed to the inner wall of the lining sealing structure 1 to support the lining sealing structure 1.

[0028] The proposed cavern hydrogen storage structure includes a lining sealing structure 1, multiple internal support components 2, and multiple sealing structures 3. The lining sealing structure 1 is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures 3 are spaced apart along the axial direction of the lining sealing structure 1, dividing the closed storage space into independent storage units. Each storage unit can have a different gas storage pressure and can store a different gas, which can effectively cope with various gas usage scenarios and rapid refueling requirements at various pressures.

[0029] Specifically, the lining sealing structure 1 includes, from the outside to the inside, a surrounding rock concrete lining layer 11, an asphalt-mixed sliding layer 12, a steel lining layer 13, an epoxy resin sealing layer hydrogen permeation prevention coating 14, and a prestressed polymer polyester film 15.

[0030] Furthermore, the prestressed polymer polyester film 15 is connected to the inner support component 2, and the inner support component 2 is used to adjust the tension of the prestressed polymer polyester film 15.

[0031] Furthermore, the epoxy resin sealing layer hydrogen leakage prevention coating 14 uses a bisphenol A type epoxy resin matrix and is doped with 5% by mass of alumina and 5% by mass of zirconium oxide nanosheets. Alumina can effectively improve hydrogen barrier performance, and zirconium oxide can significantly improve the adhesion of the epoxy resin sealing layer hydrogen leakage prevention coating to the steel lining layer 13.

[0032] Specifically, the inner support component 2 includes a control component 21 and a plurality of inner support components 22. The inner support components 22 are arranged around the control component 21. One end of the inner support component 22 is fixed to the control component 21, and the other end abuts against the lining sealing structure 1. The control component 21 is connected to the inner support component 22 and can drive the inner support component 22 to extend and retract to adjust the length of the inner support component 22.

[0033] Furthermore, the inner support assembly 22 includes a first connecting rod 221, a second connecting rod 222, a washer 223, and a cylinder. One end of the first connecting rod 221 is fixed to the control assembly 21, and the other end of the first connecting rod 221 is sleeved on the second connecting rod 222. The cylinder is fixed inside the first connecting rod 221, and the movable end of the cylinder is fixed to the second connecting rod 222. The cylinder is connected to the control assembly 21, and the washer 223 is fixed to the other end of the second connecting rod 222. The control assembly 21 can drive the movable end of the cylinder to extend and retract, thereby causing the second connecting rod 222 to extend and retract relative to the first connecting rod 221, thus realizing the adjustment of the length of the inner support assembly 22.

[0034] Furthermore, the gasket 223 has an opening to embed the prestressed polymer polyester film 15. The second connecting rod 222 is equipped with a winch, a pressure sensor, and a tension meter. The pressure sensor is in contact with the gasket 223. The tension meter and the movable end of the winch are connected to the prestressed polymer polyester film 15. The pressure sensor, the tension meter, and the winch are connected to the control component 21. The tension meter is used to detect the tension of the prestressed polymer polyester film 15. The control component 21 receives the detected pressure and tension results and drives the cylinder to extend and retract to adjust the pressure between the gasket 223 and the lining sealing structure 1, ensuring that the gasket 223 can be tightly attached to the lining sealing structure 1 during the gas storage tank filling and releasing cycle. The winch is driven to rotate to adjust the tension of the prestressed polymer polyester film 15.

[0035] Specifically, the sealing structure 3 includes a pair of oppositely arranged and independent sealing doors 31, which are used to close the storage unit adjacent to the sealing door 31.

[0036] Furthermore, the sealing door 31 includes a door frame 311, a door body 312, a movable component 313, an airbag 314, and an inflation / deflation assembly 315. The door frame 311 is fixed to the lining sealing structure 1. The door frame 311 has a hole communicating with the storage unit. The movable component 313 is fixed to the door frame 311. The door body 312 is fixed to the movable component 313. The movable component 313 can drive the door body 312 to move relative to the door frame 311, so that the door body 312 can move relative to the door frame 311. The body 312 has a closed state that fills and seals the hole and an open state that allows the hole to communicate with the outside. The airbag 314 is embedded in the inner wall of the hole and connected to the inflation / deflation assembly 315. The inflation / deflation assembly 315 is used to inflate the airbag 314 to form a seal between the door body 312 and the door frame 311 in the closed state, or to deflate the airbag 314 to disengage the seal between the door body 312 and the door frame 311 in the closed state.

[0037] Furthermore, the contact surface between the door frame 311 and the lining sealing structure 1 forms a protruding boss 316 relative to the door frame 311. The contact surface between the boss 316 and the lining sealing structure 1 is inclined, and the surface of the boss 316 is provided with threads, corresponding to the threads on the lining sealing structure 1. After the boss 316 and the lining sealing structure 1 are tightly connected, the top surface of the boss 316 will be higher than the joint. At the same time, by applying stress to the lining sealing structure 1 with screws, the boss 316 and the lining sealing structure 1 are made to fit more tightly. At the same time, sufficient space is left for internal welding, so that the gas storage tank as a whole has better airtightness.

[0038] Furthermore, the door body 312 is provided with a valve for gas injection or extraction.

[0039] Furthermore, the moving component 313 includes a horizontal moving robotic arm and a vertical moving robotic arm. The vertical moving robotic arm is fixed to the door frame 311, and the movable ends of the horizontal moving robotic arm and the vertical moving robotic arm are fixed. The movable end of the horizontal moving robotic arm is fixed to the door body 312. The horizontal moving robotic arm is used to drive the door body 312 to move horizontally, and the vertical moving robotic arm is used to drive both the horizontal moving robotic arm and the door body 312 to move vertically. When the door body 312 switches from the closed state to the open state, the horizontal moving robotic arm moves to pull the door body 312 out of the hole, and the vertical moving robotic arm moves vertically, causing the door body to be offset from the hole. The purpose of this design is to reduce the lateral space occupied by the door body 312 when the door is open, so that the distance between the relatively arranged and independent sealing doors 31 can be minimized, thereby maximizing the space of the storage unit.

[0040] Furthermore, the sealing structure 3 also includes a concrete filling ring 32, a circumferential fastening bolt 33, and an axial fastening bolt 34. The concrete filling ring 32 fills between a pair of sealing doors 31 and is fixed to the lining sealing structure 1. The circumferential fastening bolt 33 is fixed radially along the concrete filling ring 32, and one end of the circumferential fastening bolt 33 away from the concrete filling ring 32 is pre-embedded in the lining sealing structure 1. The axial fastening bolt 34 is fixed axially along the concrete filling ring 32, and one end of the axial fastening bolt 34 away from the concrete filling ring 32 is pre-embedded in the lining sealing structure 1.

[0041] Furthermore, the concrete filling ring 32 is provided with pipeline channels 321 to facilitate the arrangement of pipelines in the sealing door 31. This eliminates the need for pipeline installation within the cavern, significantly increasing the airtightness of the cavern gas storage facility.

[0042] In use, the movable component 313 drives the door body 312 to move relative to the door frame 311, so that the door body 312 enters the closed state, filling and sealing the hole. The inflation / deflation component 315 inflates the airbag 314 to form a seal between the door body 312 and the door frame 311 in the closed state. Gas is injected into the storage unit through the valve. Since each storage unit is independent, the gas storage pressure and the stored gas can be different, which can effectively cope with various gas usage scenarios and the need for rapid filling of various pressures. The control component 21 can adjust the length of the inner support component 22 and drive the inner support component 22 to pull the pre-stressed polymer polyester film 15 to adjust the inner support force on the lining sealing structure 1 and the tension of the pre-stressed polymer polyester film 15.

[0043] The beneficial effects of this invention are:

[0044] The proposed cavern hydrogen storage structure includes a lining and sealing structure, multiple internal support components, and multiple sealing structures. The lining and sealing structure is fixed to the inner wall of the cavern and forms a closed storage space. The multiple sealing structures are spaced apart along the axial direction of the lining and sealing structure, dividing the closed storage space into independent storage units. Each storage unit can have a different gas storage pressure and can store a different gas, which can effectively cope with various gas usage scenarios and rapid refueling requirements at various pressures.

[0045] The above are merely preferred embodiments of the present invention, but the scope of protection of the present invention is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the scope of the technology disclosed in the present invention should be included within the scope of protection of the present invention.

Claims

1. A cavern hydrogen storage structure, characterized in that, include: The system comprises a lining sealing structure, multiple internal support components, and multiple sealing structures. The lining sealing structure is fixed to the inner wall of the cavern and forms a closed storage space. Multiple sealing structures are spaced apart along the axial direction of the lining sealing structure, dividing the closed storage space into independent storage units. Multiple internal support components are spaced apart within each storage unit and fixed to the inner wall of the lining sealing structure to support it. Each sealing structure includes a pair of opposite and independent sealing doors for sealing the storage unit adjacent to the sealing door. Each sealing door includes a door frame, a door body, a movable component, an airbag, and an inflation / deflation assembly. The door frame is fixed to the lining sealing structure and has holes communicating with the storage units. The movable component is fixed to the door frame. The door body and the movable component... The movable component is fixed and can drive the door body to move relative to the door frame, so that the door body has a closed state that fills and seals the hole and an open state that allows the hole to communicate with the outside. The airbag is embedded in the inner wall of the hole and connected to the inflation / deflation assembly pipe. The inflation / deflation assembly is used to inflate the airbag to form a seal between the door body and the door frame when the door is in the closed state, or to deflate the airbag to disengage the seal between the door body and the door frame when the door is in the closed state. The contact surface between the door frame and the lining sealing structure forms a boss that protrudes relative to the door frame. The contact surface between the boss and the lining sealing structure is inclined. The surface of the boss is provided with threads, and there are corresponding threads at the location of the lining sealing structure. After the boss and the lining sealing structure are tightly connected, the top surface of the boss is higher than the joint.

2. The cavern hydrogen storage structure as described in claim 1, characterized in that, The lining sealing structure includes, from the outside to the inside, a surrounding rock concrete lining layer, an asphalt-mixed sliding layer, a steel lining layer, an epoxy resin sealing layer, a hydrogen permeation prevention coating, and a prestressed polymer polyester film. The prestressed polymer polyester film is connected to the inner support component, which is used to adjust the tension of the prestressed polymer polyester film.

3. The cavern hydrogen storage structure as described in claim 2, characterized in that, The epoxy resin sealing layer anti-hydrogen leakage coating uses a bisphenol A type epoxy resin matrix and is doped with 5% by mass of alumina and 5% by mass of zirconium oxide nanosheets.

4. The cave hydrogen storage structure as described in claim 2, characterized in that, The inner support component includes a control component and multiple inner support components. The inner support components are arranged around the control component. One end of the inner support component is fixed to the control component, and the other end abuts against the lining sealing structure. The control component is connected to the inner support component and can drive the inner support component to extend and retract to adjust the length of the inner support component.

5. The cavern hydrogen storage structure as described in claim 4, characterized in that, The device includes a vibration assembly. The inner support assembly includes a first connecting rod, a second connecting rod, a washer, and a cylinder. One end of the first connecting rod is fixed to the control assembly, and the other end of the first connecting rod is sleeved on the second connecting rod. The cylinder is fixed inside the first connecting rod, and the movable end of the cylinder is fixed to the second connecting rod. The cylinder is connected to the control assembly, and the washer is fixed to the other end of the second connecting rod.

6. The cavern hydrogen storage structure as described in claim 5, characterized in that, The gasket has an opening to embed the prestressed high-polymer polyester film. The second connecting rod contains a winch, a pressure sensor, and a tension meter. The pressure sensor contacts the gasket. The tension meter and the movable end of the winch are connected to the prestressed high-polymer polyester film. The pressure sensor, tension meter, and winch are connected to the control component. The tension meter is used to detect the tension of the prestressed high-polymer polyester film. The control component receives the detected pressure and tension results, drives the cylinder to extend and retract to adjust the pressure between the gasket and the lining sealing structure, and drives the winch to rotate to adjust the tension of the prestressed high-polymer polyester film.

7. The cavern hydrogen storage structure as described in claim 1, characterized in that, The moving component includes a horizontal moving robotic arm and a vertical moving robotic arm. The vertical moving robotic arm is fixed to the door frame. The horizontal moving robotic arm is fixed to the movable end of the vertical moving robotic arm. The movable end of the horizontal moving robotic arm is fixed to the door body. The horizontal moving robotic arm is used to drive the door body to move horizontally. The vertical moving robotic arm is used to drive the horizontal moving robotic arm and the door body to move vertically.

8. The cavern hydrogen storage structure as described in claim 1, characterized in that, The sealing structure further includes a concrete filling ring, a circumferential fastening bolt, and an axial fastening bolt. The concrete filling ring fills the space between a pair of sealing doors and is fixed to the lining sealing structure. The circumferential fastening bolt is fixed radially along the concrete filling ring, with one end of the circumferential fastening bolt embedded in the lining sealing structure. The axial fastening bolt is fixed axially along the concrete filling ring, with one end of the axial fastening bolt embedded in the lining sealing structure.

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