Pouring system and pouring method of cavern hydrogen storage bank

Abstract

The invention discloses a pouring system and a pouring method for a cavern hydrogen storage bank. The pouring system of the cavern hydrogen storage library comprises a cavern hydrogen storage structure and telescopic pouring equipment. The cavern hydrogen storage structure comprises a cavern, a steel lining layer and a concrete lining layer, and the steel lining layer is divided into multiple sections of steel linings in the axis direction of the cavern. The telescopic pouring equipment comprises a concrete storage tank, a grouting pipe and a pull wire, the grouting pipe comprises a plurality of sub-pipes extending in the axis direction of the cavern, every two adjacent sub-pipes are sleeved with each other and connected in a sliding mode, and at least part of the sub-pipes are connected with the pull wire. According to the embodiment of the invention, the steel lining layer and the concrete lining layer are divided into a plurality of sections, so that quality reduction, process complexity and cost increase caused by one-time construction are avoided; grouting holes are not formed in the multiple sections of steel linings, multiple sections of concrete linings are poured every time one section of steel lining is pushed, the concrete pouring quality can be improved through segmented construction, the concrete pouring speed can be increased, and a high-density, large-scale and low-cost deep hydrogen energy storage system can be constructed.

Description

Technical Field

[0001] The present invention relates to the field of new energy storage technology, and in particular to a casting system and a casting method for a cave hydrogen storage tank. Background Art

[0002] For a long time, the use of fossil energy has caused many environmental problems such as climate warming and ecological damage. It is urgent to find clean and low-carbon alternative energy sources and optimize the energy structure. Hydrogen energy is a clean and efficient secondary energy source that can realize the mutual conversion of different energy forms such as electricity, gas, and heat. It can play a positive role in power generation, transportation, energy storage, smart grids and other fields, and is an important part of building a global low-carbon energy system. However, considering the physical and chemical characteristics of hydrogen, such as "small molecules, high activity, and strong penetration", its large-scale storage has always been a global problem and has become a technical bottleneck restricting the rapid development of the hydrogen energy industry.

[0003] With the continuous advancement of underground space development and utilization technology, deep underground hydrogen storage is regarded as the most feasible development direction in large-scale hydrogen storage technology. Compared with other storage methods, underground rock cavern hydrogen storage technology, as an innovative technology with great potential in the field of energy storage and clean energy transformation, has attracted extensive research and attention in recent years. However, underground hydrogen storage technology still faces some technical challenges and shortcomings. First, the research on underground hydrogen storage is still in its early stages, especially the serious lack of data on brine / hydrogen / rock interactions, which limits the specific implementation of underground hydrogen storage depots. Secondly, the cost of underground hydrogen storage is relatively high. In addition, underground hydrogen storage also faces challenges such as microbial growth, well integrity, and geochemical reactions.

[0004] In summary, the existing underground rock cavern hydrogen storage technology has potential, but there are technical problems such as water-rock-gas interaction and high cost. Summary of the invention

[0005] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a casting system and casting method for a cave hydrogen storage reservoir, and solve the technical problems of water-rock-gas interaction and high cost in the prior art.

[0006] In order to achieve the above technical objectives, this application adopts the following technical solutions: In a first aspect, the present application provides a casting system for a cave hydrogen storage reservoir, including a cave hydrogen storage structure and a telescopic casting device: A cave hydrogen storage structure, the cave hydrogen storage structure comprising a cave, a steel lining and a concrete lining, the steel lining is located inside the cave, the concrete lining is filled between the cave and the steel lining, and the steel lining is divided into multiple sections along the axial direction of the cave; and A telescopic casting device, the telescopic casting device comprising a concrete storage tank, a grouting pipe and a traction line, one end of the grouting pipe is connected to the concrete storage tank, and the other end faces the concrete lining layer, the grouting pipe comprises a plurality of sub-pipes extending along the axial direction of the cave, two adjacent sub-pipes are mutually nested and slidably connected, and at least some of the sub-pipes are connected to the traction line.

[0007] In some embodiments of the present application, the rock cave hydrogen storage structure further includes a friction reduction layer and a hydrogen barrier layer, the friction reduction layer is bonded to the outer side of the steel lining, and the hydrogen barrier layer is bonded to the inner side of the steel lining.

[0008] In some embodiments of the present application, the concrete lining layer includes a steel skeleton and concrete slurry, the steel skeleton is located between the rock cave and the steel lining layer, and the concrete slurry is filled in the steel skeleton.

[0009] In some embodiments of the present application, the telescopic casting equipment also includes a concrete diversion bin and a concrete delivery pipe, the concrete diversion bin has an inlet and multiple outlets, the concrete storage tank is connected to the inlet of the concrete diversion bin, and the multiple outlets of the concrete diversion bin are respectively connected to multiple concrete delivery pipes, and each concrete delivery pipe is connected to one grouting pipe.

[0010] In some embodiments of the present application, the telescopic casting equipment further includes a plurality of valves, and each of the concrete delivery pipes is provided with one valve.

[0011] In some embodiments of the present application, the telescopic casting equipment also includes a disc template, which has a plurality of through holes extending therethrough, and the plurality of through holes are distributed along the circumference of the disc template, and the concrete delivery pipe or the grouting pipe passes through the through holes.

[0012] In some embodiments of the present application, the disc template includes a coaxially arranged inner supporting structure and a fastening plate, the inner supporting structure and the fastening plate are both annular, the through hole is arranged on the inner supporting structure, the outer edge of the inner supporting structure coincides with the inner edge of the fastening plate, the inner edge of the inner supporting structure abuts against the steel lining, and the outer edge of the fastening plate is connected to the rock cave bolts.

[0013] In some embodiments of the present application, the multiple sub-pipes include at least a top pipe, a middle pipe and a tail pipe, the outer diameter of the top pipe is equal to the inner diameter of the middle pipe, the outer diameter of the middle pipe is equal to the inner diameter of the tail pipe, the tail pipe is threadedly connected to the inner supporting structure and the concrete conveying pipe, respectively, the end of the middle pipe facing the tail pipe is connected to the traction line, the end of the top pipe facing the middle pipe is connected to the traction line, and a miniature camera is provided at the end of the top pipe facing away from the middle pipe.

[0014] In a second aspect, the present application further provides a method for casting a cave hydrogen storage reservoir, using a casting system for a cave hydrogen storage reservoir as described in any embodiment of the first aspect, comprising the following steps: Pushing a section of steel lining into the inner side of the cave, adjusting the length of the grouting pipe by telescopic pouring equipment, and pouring multiple sections of concrete lining using the section of steel lining as the inner formwork; Pushing the next section of the steel lining until it abuts against the previous section of the steel lining, adjusting the length of the grouting pipe by the telescopic casting equipment, and casting a plurality of the concrete linings using the next section of the steel lining as an inner formwork; Repeat the above steps section by section until the steel lining and concrete lining are formed.

[0015] In some embodiments of the present application, the casting method further comprises: Welding and pasting a friction-reducing layer on the outer side of each section of the steel lining; The hydrogen barrier layer is pasted and welded in sections on the inner side of the steel lining.

[0016] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: In the embodiment of the present application, the steel lining and the concrete lining layer are divided into multiple sections. The construction of multiple sections of steel lining can jointly construct a hydrogen storage tank with a total depth of greater depth. A single section of steel lining corresponds to multiple sections of concrete lining, so that the length of the single section of steel lining can be longer, and the structural strength, durability and sealing can be better, while avoiding the quality degradation, process complexity and cost increase caused by the one-time construction of the steel lining and the concrete lining layer. At the same time, no grouting holes are arranged on the multiple sections of steel lining. In conjunction with the telescopic casting equipment, each time a section of steel lining is advanced, the length of the grouting pipe of the telescopic casting equipment is adjusted to cast multiple sections of concrete lining. The segmented construction can not only improve the quality of concrete casting, accelerate the concrete casting speed, but also build a high-density, large-scale, low-cost deep underground hydrogen energy storage system. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solution in this application, the following is a brief introduction to the drawings required for use in the embodiments: Figure 1 It is a structural schematic diagram of a casting system of a cave hydrogen storage tank provided in an embodiment of the present application; Figure 2 It is a structural schematic diagram of a telescopic concrete pouring equipment provided in an embodiment of the present application; Figure 3 It is a structural schematic diagram of a disc template provided in an embodiment of the present application; Figure 4 It is a structural schematic diagram of a grouting pipe provided in an embodiment of the present application.

[0018] Reference numerals: 1- rock cave, 2- steel lining, 3- concrete lining, 4- concrete storage tank, 5- grouting pipe, 6- traction line, 7- anti-friction layer, 8- concrete diversion bin, 9- concrete delivery pipe, 10- valve, 11- disc template, 12- bolt, 13- camera; 51 - top pipe, 52 - middle pipe, 53 - tail pipe, 121 - inner supporting structure, 122 - fastening plate. DETAILED DESCRIPTION

[0019] In order to make the purpose, technical solution and advantages of the present application more clearly understood, the present application is further described in detail below in conjunction with the accompanying drawings and embodiments. It should be understood that the specific embodiments described herein are only used to explain the present application and are not used to limit the present application.

[0020] Those skilled in the art will appreciate that in this specification, the wording "including" is an open-ended expression, which means that the described features exist but does not exclude other features. The directional words "up", "down", "left", "right", etc. are exemplary directions based on the drawings. Features defined as "first" and "second" implicitly include one or more of the features. Singular expressions can also be used in the plural. "Multiple" means two or more. The terms "installed", "connected", and "connected" can be fixed connections, detachable connections, or integrated connections; they can be directly connected, or indirectly connected through an intermediate medium, or they can be internal connections between two elements. In addition, "connected" can include wireless connections.

[0021] The purpose of this application is to overcome the above-mentioned technical deficiencies, propose a casting system and casting method for a cave hydrogen storage reservoir, and solve the technical problems of water-rock-gas interaction and high cost in the prior art.

[0022] In order to achieve the above technical objectives, this application adopts the following technical solutions: In the first aspect, the present application provides a casting system for a cave hydrogen storage reservoir, such as Figure 1 As shown, Figure 1 It is a structural schematic diagram of a casting system for a cave hydrogen storage tank provided in an embodiment of the present application.

[0023] A casting system for a cave hydrogen storage tank, comprising a cave hydrogen storage structure and a telescopic casting device: A cave hydrogen storage structure, comprising a cave 1, a steel lining 2 and a concrete lining 3, wherein the steel lining 2 is located inside the cave 1, the concrete lining 3 is filled between the cave 1 and the steel lining 2, and the steel lining 2 is divided into multiple sections along the axis of the cave 1; and A telescopic casting equipment, the telescopic casting equipment includes a concrete storage tank 4, a grouting pipe 5 and a traction line 6, one end of the grouting pipe 5 is connected to the concrete storage tank 4, and the other end is toward the concrete lining layer 3, the grouting pipe 5 includes a plurality of sub-pipes extending along the axial direction of the cave 1, two adjacent sub-pipes are mutually nested and slidably connected, and at least part of the sub-pipes are connected to the traction line 6.

[0024] In the embodiment of the present application, the steel lining 2 and the concrete lining layer 3 are divided into multiple sections. The construction of multiple sections of steel lining can jointly construct a hydrogen storage reservoir with a total depth of greater depth. A single section of steel lining corresponds to multiple sections of concrete lining, so that the length of the single section of steel lining can be longer, and the structural strength, durability and sealing can be better, while avoiding the quality degradation, process complexity and cost increase caused by the one-time construction of the steel lining 2 and the concrete lining layer 3. At the same time, no grouting holes are arranged on the multiple sections of steel lining. In conjunction with the telescopic casting equipment, each time a section of steel lining is advanced, the length of the grouting pipe 5 of the telescopic casting equipment is adjusted to cast multiple sections of concrete lining. The segmented construction can not only improve the quality of concrete casting, accelerate the concrete casting speed, but also build a high-density, large-scale, low-cost deep underground hydrogen energy storage system.

[0025] In some embodiments of the present application, the rock cave hydrogen storage structure further includes a friction reduction layer 7 and a hydrogen barrier layer, the friction reduction layer 7 is bonded to the outer side of the steel lining 2 , and the hydrogen barrier layer is bonded to the inner side of the steel lining 2 .

[0026] In this embodiment, each section of the steel lining is a complete steel plate rolled and welded into a ring and then placed in the hole one by one until multiple sections of the steel lining are arranged in parallel to form a complete steel lining layer 2. As an inner template for concrete pouring, no grouting holes are set on the steel plate. The friction-reducing layer 7 is pasted on the outer surface of the steel lining, and the hydrogen barrier layer is formed by welding a plurality of arc-shaped polymer materials and pasted on the inner surface of the steel lining. After each section of the steel lining is placed in the hole, the concrete of that section is poured, and then the next section of the steel lining is pushed.

[0027] The friction-reducing layer 7 can reduce the friction between the steel lining 2 and the wall of the cave 1, thereby extending the service life of the structure. Meanwhile, the hydrogen barrier layer can effectively prevent hydrogen from reacting with the inner surface of the steel lining 2, thereby reducing the risk of corrosion.

[0028] The steel lining 2 plays a certain role in hydrogen sealing and serves as a concrete inner formwork. The surface of the steel lining is complete and smooth without grouting holes. The structural integrity of the steel plate is maintained, thereby improving the strength and durability of the structure. The sealing of the steel plate can be improved and possible leakage points can be reduced. The concrete is poured into the warehouse outside the steel lining through the telescopic concrete pouring equipment.

[0029] In some embodiments of the present application, the concrete lining layer 3 includes a steel skeleton and concrete slurry, the steel skeleton is located between the rock cave 1 and the steel lining layer 2, and the concrete slurry is filled in the steel skeleton.

[0030] In this embodiment, the concrete lining layer 3 is located between the steel lining layer 2 and the friction reducing layer 7. The cross section of the concrete lining layer 3 is a circular ring, and the concrete is poured into the warehouse in sections by a telescopic concrete pouring device.

[0031] After each section of the annular steel lining enters the hole, it is poured to obtain multiple sections of concrete lining. Then it enters the next section of the steel lining and pours multiple sections of concrete lining. This is repeated several times in sequence to obtain multiple sections of parallel concrete lining to form a complete concrete lining layer 3.

[0032] The combination of steel skeleton and concrete slurry provides additional structural support, enhancing the stability and bearing capacity of the entire cave hydrogen storage tank. The steel skeleton can be used as a template for concrete pouring, simplifying the construction process and improving construction efficiency.

[0033] like Figure 2 As shown, Figure 2 It is a structural schematic diagram of a telescopic concrete pouring equipment provided in an embodiment of the present application.

[0034] In some embodiments of the present application, the telescopic casting equipment also includes a concrete diversion bin 8 and a concrete delivery pipe 9, the concrete diversion bin 8 has an inlet and multiple outlets, the concrete storage tank 4 is connected to the inlet of the concrete diversion bin 8, and the multiple outlets of the concrete diversion bin 8 are respectively connected to multiple concrete delivery pipes 9, and each concrete delivery pipe 9 is connected to one grouting pipe 5.

[0035] In some embodiments of the present application, the telescopic casting equipment further includes a plurality of valves 10 , and each of the concrete delivery pipes 9 is provided with one valve 10 .

[0036] like Figure 3 As shown, Figure 3 It is a structural schematic diagram of a disc template 11 provided in an embodiment of the present application.

[0037] In some embodiments of the present application, the telescopic casting equipment also includes a disc template 11, which has a plurality of through holes, and the plurality of through holes are distributed along the circumference of the disc template 11, and the concrete delivery pipe 9 or the grouting pipe 5 passes through the through holes.

[0038] In some embodiments of the present application, the disc template 11 includes a coaxially arranged inner supporting structure 121 and a fastening plate 122, the inner supporting structure 121 and the fastening plate 122 are both annular, the through hole is arranged on the inner supporting structure 121, the outer edge of the inner supporting structure 121 coincides with the inner edge of the fastening plate 122, the inner edge of the inner supporting structure 121 abuts against the steel lining 2, and the outer edge of the fastening plate 122 is connected to the bolt 12 of the rock cave 1.

[0039] In this embodiment, since each section of the steel lining is very long and no grouting holes are provided on the steel lining, concrete pouring is difficult, so a retractable concrete pouring device is required. The disc template 11 is used as a concrete pouring port template, and the concrete pouring device pumps the concrete transported from the outside of the cave to the diversion bin 8 through the concrete storage tank 4, and disperses the concrete through the diversion bin 8 to the grouting pipes 5 at four different positions.

[0040] The concrete storage tank 4 is connected to one end of the concrete diversion bin 8 through a concrete delivery pipe 9, and the other end of the concrete diversion bin 8 is connected to four grouting pipes 5 through four concrete delivery pipes 9, each of which is provided with a valve 10, and the tail ends of the four grouting pipes 5 are threadedly connected to the disc template 11. A hole is reserved on the top, bottom, left and right of the disc template 11, and the diameter is the same as the outer diameter of the grouting tail pipe 53 and the concrete delivery pipe 9, and the hole is threadedly connected to the grouting tail pipe 53. The disc template 11 is annular, and an inner supporting structure 121 is provided at the inner ring to the inside of the steel lining, which supports the steel lining during the concrete pouring process; a fastening plate 122 extending outward along the inner wall of the rock cave 1 is provided at the outer ring, and the connecting plate is anchored to the inner wall of the rock cave 1 by bolts 12, and the overall disc template 11 serves as a concrete outer mold.

[0041] The design of the disc formwork 11 provides a stable platform for concrete pouring, which helps to ensure the uniform distribution of concrete and the stability of the structure. The design of the concrete diversion bin 8 and the concrete delivery pipe 9 can achieve rapid distribution and transportation of concrete, thereby improving construction efficiency. Through the connection of multiple discharge ports and the concrete delivery pipe 9, the distribution of concrete can be accurately controlled to ensure that each position can be fully poured. Through the connection of multiple discharge ports and the concrete delivery pipe 9, the distribution of concrete can be accurately controlled to ensure that each position can be fully poured. The design of the telescopic concrete pouring equipment enables it to adapt to steel linings of different lengths, and even if grouting holes are not provided on the steel lining, uniform concrete pouring can be achieved. The design of the valve 10 can control the flow of concrete, prevent concrete from overflowing and losing, and improve the safety of construction.

[0042] like Figure 4 As shown, Figure 4 It is a schematic structural diagram of a grouting pipe 5 provided in an embodiment of the present application.

[0043] In some embodiments of the present application, the plurality of sub-pipes include at least a top pipe 51, a middle pipe 52 and a tail pipe 53, the outer diameter of the top pipe 51 is equal to the inner diameter of the middle pipe 52, the outer diameter of the middle pipe 52 is equal to the inner diameter of the tail pipe 53, the tail pipe 53 is threadedly connected to the inner supporting structure 121 and the concrete conveying pipe 9, respectively, the end of the middle pipe 52 facing the tail pipe 53 is connected to the traction line 6, the end of the top pipe 51 facing the middle pipe 52 is connected to the traction line 6, and a miniature camera 13 is provided at the end of the top pipe 51 facing away from the middle pipe 52.

[0044] In this embodiment, the structure hole of the grouting pipe 5 includes a top pipe 51, a middle pipe 52, and a tail pipe 53 from the inside to the outside of the hole. The outer diameter of the top pipe 51 is the same as the inner diameter of the middle pipe 52, and the outer diameter of the middle pipe 52 is the same as the inner diameter of the tail pipe 53. The tail pipe 53 is connected to the disc template 11 and the concrete delivery pipe 9 through threads; the tail of the middle pipe 52 is connected to one end of the traction line 6, and the other end is connected to the outside world for recovering the middle pipe 52; the tail of the top pipe 51 is connected to the outside world through a traction line 6 for recovering the top pipe 51, and the head is a concrete discharge port, and a micro camera 13 is set next to the discharge port for observing the concrete pouring situation.

[0045] When the concrete is grouted to the grouting port of the top pipe 51, the middle pipe 52 is pulled back to the position of the tail pipe 53 by the traction line 6 to continue pouring the next section. The pouring position can be flexibly adjusted to achieve concrete pouring in different depth areas.

[0046] Since the length of a single section of steel lining is relatively long, it is difficult to construct using the traditional grouting pipe 5 whose length cannot be changed. In the present embodiment, at least three sub-pipes are provided, and the lengths of the three sub-pipes are adjustable. In fact, at least three sections of concrete lining can be formed by pouring in at least three times. The combination of three sections of concrete lining corresponds to one section of steel lining, which reduces the difficulty of construction.

[0047] In a second aspect, the present application further provides a method for casting a cave hydrogen storage reservoir, using a casting system for a cave hydrogen storage reservoir as described in any embodiment of the first aspect, comprising the following steps: Push a section of steel lining to the inside of the cave 1, adjust the length of the grouting pipe 5 by telescopic pouring equipment, and pour multiple sections of concrete lining using the section of steel lining as the inner template; Push the steel lining of the next section forward until it abuts against the steel lining of the previous section, adjust the length of the grouting pipe 5 by the telescopic casting device, and then cast multiple sections of concrete lining using the steel lining of the next section as the inner formwork; The above step is repeated section by section until the steel lining layer 2 and the concrete lining layer 3 are formed.

[0048] In some embodiments of the present application, the casting method further comprises: Welding and pasting a friction-reducing layer 7 on the outer side of each section of the steel lining; The hydrogen barrier layer is pasted and welded in sections on the inner side of the steel lining 2 .

[0049] In this embodiment, the construction of the steel lining 2 includes: rolling, ringing, welding and pasting the friction-reducing layer 7 on the steel plate in the factory according to the design requirements, and using mechanical equipment to push each section of the steel lining into the cave 1 and fix it, thereby completing the construction of the steel lining 2.

[0050] The construction of the concrete lining layer 3 includes: erecting multiple annular supports inside the steel lining 2 according to design requirements to support and strengthen the steel lining 2, using the steel lining 2 as an inner template for concrete pouring, setting a retractable concrete pouring equipment at the outer end of the steel lining, fixing the equipment with bolts 12, and pouring concrete in sections.

[0051] The construction of the polymer hydrogen barrier layer includes: removing the annular support inside the steel lining 2 from the inside to the outside, then grinding and cleaning the inside of the steel lining 2, pasting and welding the hydrogen barrier layer in sections, cleaning the equipment in the cave and leaving the site after welding, and the construction of the rock cave hydrogen storage tank is completed.

[0052] Compared with the prior art, the technical solution provided by this application has the following beneficial technical effects: In the embodiment of the present application, the steel lining 2 and the concrete lining layer 3 are divided into multiple sections. The construction of multiple sections of steel lining can jointly construct a hydrogen storage reservoir with a total depth of greater depth. A single section of steel lining corresponds to multiple sections of concrete lining, so that the length of the single section of steel lining can be longer, and the structural strength, durability and sealing can be better, while avoiding the quality degradation, process complexity and cost increase caused by the one-time construction of the steel lining 2 and the concrete lining layer 3. At the same time, no grouting holes are arranged on the multiple sections of steel lining. In conjunction with the telescopic casting equipment, each time a section of steel lining is advanced, the length of the grouting pipe 5 of the telescopic casting equipment is adjusted to cast a section of concrete lining. The segmented construction can not only improve the quality of concrete casting, accelerate the concrete casting speed, but also build a high-density, large-scale, low-cost deep underground hydrogen energy storage system.

[0053] Those skilled in the art will appreciate that the various operations, methods, steps, measures, and schemes in the processes discussed in this application may be alternated, modified, rearranged, decomposed, combined, or deleted.

[0054] The specific implementation methods of the present application described above do not constitute a limitation on the protection scope of the present application. Any other corresponding changes and modifications made according to the technical concept of the present application should be included in the protection scope of the claims of the present application.

Claims

1. A casting system for a cave hydrogen storage tank, characterized in that: include: A cave hydrogen storage structure, the cave hydrogen storage structure comprising a cave, a steel lining and a concrete lining layer, the steel lining layer being located inside the cave, the concrete lining layer being filled between the cave and the steel lining layer, and the steel lining layer being divided into multiple sections along the axial direction of the cave; as well as A telescopic casting device, the telescopic casting device comprising a concrete storage tank, a grouting pipe and a traction line, one end of the grouting pipe is connected to the concrete storage tank, and the other end faces the concrete lining layer, the grouting pipe comprises a plurality of sub-pipes extending along the axial direction of the cave, two adjacent sub-pipes are mutually nested and slidably connected, and at least some of the sub-pipes are connected to the traction line.

2. A casting system for a cave hydrogen storage tank according to claim 1, characterized in that: The rock cave hydrogen storage structure further comprises a friction reduction layer and a hydrogen barrier layer, wherein the friction reduction layer is bonded to the outer side of the steel lining layer, and the hydrogen barrier layer is bonded to the inner side of the steel lining layer.

3. A casting system for a cave hydrogen storage tank according to claim 1, characterized in that: The concrete lining layer comprises a steel skeleton and concrete slurry. The steel skeleton is located between the rock cave and the steel lining layer, and the concrete slurry is filled in the steel skeleton.

4. A casting system for a cave hydrogen storage tank according to claim 1, characterized in that: The telescopic casting equipment also includes a concrete diversion bin and a concrete delivery pipe. The concrete diversion bin has an inlet and multiple outlets. The concrete storage tank is connected to the inlet of the concrete diversion bin. The multiple outlets of the concrete diversion bin are respectively connected to multiple concrete delivery pipes, and each concrete delivery pipe is connected to one grouting pipe.

5. A casting system for a cave hydrogen storage tank according to claim 4, characterized in that: The telescopic pouring equipment also includes a plurality of valves, and each of the concrete delivery pipes is provided with one valve.

6. A casting system for a cave hydrogen storage tank according to claim 4, characterized in that: The telescopic casting equipment also includes a disc template, which has a plurality of through holes, and the plurality of through holes are distributed along the circumference of the disc template, and the concrete delivery pipe or the grouting pipe passes through the through holes.

7. A casting system for a cave hydrogen storage tank according to claim 6, characterized in that: The disc template includes a coaxially arranged inner supporting structure and a fastening plate, both of which are annular. The through hole is arranged on the inner supporting structure, the outer edge of the inner supporting structure coincides with the inner edge of the fastening plate, the inner edge of the inner supporting structure abuts against the steel lining, and the outer edge of the fastening plate is connected to the rock cave bolts.

8. A casting system for a cave hydrogen storage tank according to claim 7, characterized in that: The multiple sub-pipes at least include a top pipe, a middle pipe and a tail pipe. The outer diameter of the top pipe is equal to the inner diameter of the middle pipe, the outer diameter of the middle pipe is equal to the inner diameter of the tail pipe, the tail pipe is threadedly connected to the inner supporting structure and the concrete conveying pipe respectively, one end of the middle pipe facing the tail pipe is connected to the traction line, one end of the top pipe facing the middle pipe is connected to the traction line, and a miniature camera is provided on the end of the top pipe facing away from the middle pipe.

9. A method for casting a cave hydrogen storage tank, characterized in that: The pouring system of the cave hydrogen storage tank according to any one of claims 1 to 8 comprises the following steps: Pushing a section of steel lining into the inner side of the rock cave, adjusting the length of the grouting pipe by telescopic pouring equipment, and pouring multiple sections of concrete lining using the steel lining as an inner formwork; Pushing the steel lining of the next section forward until it abuts against the steel lining of the previous section, adjusting the length of the grouting pipe by the telescopic casting equipment, and casting a plurality of the concrete linings using the steel lining of the next section as an inner formwork; Repeat the above steps section by section until the steel lining and concrete lining are formed.

10. A method for casting a cave hydrogen storage tank according to claim 9, characterized in that: The pouring method also includes: Welding and pasting a friction-reducing layer on the outer side of each section of the steel lining; The hydrogen barrier layer is pasted and welded in sections on the inner side of the steel lining.

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