Underground large-scale hydrogen storage warehouse structure

Abstract

The utility model relates to an underground large-scale hydrogen storage warehouse structure, the underground large-scale hydrogen storage warehouse structure comprises a warehouse body, a sealing structure and a sealing device, the warehouse body is used for being arranged underground, the warehouse body comprises a concrete lining layer and a concrete bottom plate, the concrete lining layer is provided with a cavity with openings at the upper end and the lower end, and the concrete bottom plate is arranged at the bottom of the concrete lining layer. The lower end of the cavity is blocked; the sealing structure is laid on the inner side of the cavity and used for sealing the cavity. And the sealing device is arranged at the top of the concrete lining layer and is in sealed connection with the upper end of the cavity, the sealing device and the warehouse body jointly define a hydrogen storage space, and the sealing device is further provided with an inflation and deflation channel communicating with the hydrogen storage space. The underground hydrogen storage device can be pre-buried under various landforms to form a hydrogen storage bank, the structure of the hydrogen storage bank is located underground, the advantage that environmental factors such as underground temperature and humidity are stable can be utilized, safe storage is achieved, and meanwhile the surrounding rock-soil body can provide a natural enclosure effect.

Description

Technical Field

[0001] This utility model relates to the field of hydrogen storage technology, and in particular to a structure for a large-scale underground hydrogen storage facility. Background Technology

[0002] Hydrogen energy is widely recognized as one of the most promising clean energy sources of the 21st century. At this crossroads of the "dual-carbon era," various energy sectors are vigorously promoting transformation and upgrading. For example, the coal chemical industry is undergoing significant technological transformation to achieve carbon reduction goals, developing clean energy power generation for hydrogen production and adopting green hydrogen-to-olefins technology. The power energy industry is utilizing domestic wind and electricity curtailment and off-peak electricity for water electrolysis to produce hydrogen. The transportation and logistics industry is promoting the construction of hydrogen refueling stations. The increasing demand for various hydrogen energy applications places higher demands on the safety and efficient storage of hydrogen energy.

[0003] Patent CN219139138U discloses an underground hydrogen storage device, comprising a hydrogen storage cavern for storing hydrogen gas, the cavern being located in an underground rock formation; a sealing lining layer is provided on the inner wall of the cavern, the sealing lining layer comprising a sealing inner lining layer and a lining layer arranged sequentially from the inside to the outside, the sealing inner lining layer being capable of sealing the hydrogen gas inside the cavern, and the lining layer being located between the sealing inner lining layer and the inner wall of the cavern, capable of fixing the sealing inner lining layer.

[0004] However, the hydrogen storage caverns mentioned above require specific geological conditions to meet hydrogen storage requirements and cannot be applied to various landforms. Utility Model Content

[0005] In view of this, it is necessary to provide a large-scale underground hydrogen storage structure to solve the technical problem that existing hydrogen storage caverns require specific geological conditions to meet hydrogen storage requirements and are not applicable to various landforms.

[0006] This utility model provides a structure for a large-scale underground hydrogen storage facility, which includes:

[0007] The tank body is designed for underground installation. The tank body includes a concrete lining layer and a concrete base slab. The concrete lining layer has a cavity with openings at both the top and bottom. The concrete base slab is located at the bottom of the concrete lining layer to seal the lower end of the cavity.

[0008] A sealing structure, laid inside the cavity, is used to seal the cavity; and

[0009] A sealing device is located on top of the concrete lining layer and is sealed to the upper end of the cavity. The sealing device and the storage body together enclose a hydrogen storage space. The sealing device is also provided with a gas filling and releasing channel that connects to the hydrogen storage space.

[0010] In some embodiments, the concrete lining layer includes a plurality of cylindrical structures, which are sequentially connected in a vertical direction, and a connecting structure is provided between two adjacent cylindrical structures. The connecting structure includes a tenon and a mortise that cooperate with each other, wherein the tenon is provided in the upper cylindrical structure of the two cylindrical structures, and the mortise is provided in the lower cylindrical structure of the two cylindrical structures.

[0011] In some embodiments, the cylindrical structure includes multiple precast cylindrical segments and multiple prestressing tendons. The precast cylindrical segments are arranged in an arc shape and are connected sequentially along the circumference. Each precast cylindrical segment has a prestressing tendon channel passing through it along the circumference. The outer sides of both ends of the precast cylindrical segment are provided with grooves that communicate with the prestressing tendon channels. Each prestressing tendon passes through two adjacent prestressing tendon channels. Both ends of the prestressing tendon are fixed to the sidewall of the groove by anchors. The prestressing tendon is used to fix two adjacent precast cylindrical segments.

[0012] In some embodiments, the sealing device further includes an opening communicating with the hydrogen storage space;

[0013] The underground large-scale hydrogen storage structure also includes a sealed door structure, which is located at the opening and used to open and close the opening.

[0014] In some embodiments, the sealing door structure includes a door frame, a sealing door, a drive mechanism, and a sealing ring. The door frame is disposed around the periphery of the opening, and a sealing groove is provided around the circumference of the door frame. One end of the sealing door is rotatably mounted on one side of the door frame along a horizontal axis. The drive mechanism is connected to the sealing door and is used to drive the sealing door to rotate. The sealing ring is disposed in the sealing groove so that when the sealing door closes the opening, a portion of the sealing door extends into the sealing groove and abuts against the sealing ring.

[0015] In some embodiments, a pivot hole is provided on one side of the door frame, and a pivot is provided at one end of the sealed door, the pivot being rotatably installed in the pivot hole;

[0016] The driving mechanism includes a first gear, a second gear, and a drive motor. The first gear is rotatably mounted on the door frame, and the second gear is fixedly mounted on the rotating shaft. The first gear and the second gear mesh with each other. The drive motor is connected to the first gear and is used to drive the first gear to rotate.

[0017] In some embodiments, the sealing structure includes a sliding buffer layer and a hydrogen barrier sealing layer. The sliding buffer layer is bonded to the inner surface of the cavity with epoxy resin adhesive, and the hydrogen barrier sealing layer is bonded to the hydrogen-facing side of the sliding buffer layer with epoxy resin adhesive.

[0018] The sliding buffer layer is made of high-damping rubber with a thickness of 10-50 mm; the hydrogen-blocking sealing layer is made of polyvinyl alcohol film with a thickness of 3-10 mm; and the epoxy resin adhesive uses bisphenol A type epoxy resin matrix and is doped with 5% by mass of alumina and 5% by mass of boron nitride nanosheets.

[0019] In some embodiments, a plurality of anti-pull-out composite anchor piles are provided at the bottom of the concrete base slab and at the bottom of the sealing device. The anti-pull-out composite anchor piles are used to be embedded in the ground to fix the concrete base slab and the sealing device.

[0020] In some embodiments, the sealing device is a reinforced concrete structure, and the cross-sectional area of ​​the sealing device is larger than the cross-sectional area of ​​the concrete lining layer.

[0021] Furthermore, this utility model also provides a construction method for an underground large-scale hydrogen storage structure, which includes the following steps:

[0022] Fabricate precast cylindrical sections and sealing devices, and use the precast cylindrical sections to create the cylindrical structure;

[0023] The site was leveled, a guide trench was excavated, and multiple sets of dewatering wells were set up around the concrete lining layer to reduce groundwater levels. The dewatering wells were then used to make anti-pull-out composite anchor piles.

[0024] The cylindrical structure is laid down and then spliced ​​together in sequence to form a concrete lining layer.

[0025] Multiple sets of dewatering wells are set at the bottom of the concrete lining layer to reduce groundwater, and anti-uplift composite anchor piles are made using the dewatering wells. The concrete base slab is then poured so that the concrete base slab and the anti-uplift composite anchor piles form an integral whole.

[0026] A sealing structure is attached to the inside of the concrete lining layer and the concrete base slab;

[0027] Multiple sets of dewatering wells are installed on the top periphery of the concrete lining layer to reduce groundwater levels, and these dewatering wells are used to construct anti-uplift composite anchor piles.

[0028] The sealing device is installed on top of the concrete lining layer and fixed to the pull-out composite anchor pile to form the entire hydrogen storage structure.

[0029] Compared with existing technologies, the underground large-scale hydrogen storage structure provided by this utility model includes a concrete lining layer and a concrete base slab. The concrete lining layer has a cavity with openings at both the top and bottom. The concrete base slab is located at the bottom of the concrete lining layer to seal the lower end of the cavity. A sealing structure is laid inside the cavity to seal it. A sealing device is located at the top of the concrete lining layer and is sealed to the upper end of the cavity. The sealing device and the storage body together enclose a hydrogen storage space. The sealing device also has a gas filling and releasing channel connecting the hydrogen storage space. The storage body made by the concrete lining layer and the concrete base slab can be pre-buried in various terrains regardless of topography to form a hydrogen storage tank. Since the hydrogen storage structure is located underground, it can take advantage of the relatively stable underground temperature, humidity and other environmental factors to achieve safe storage. At the same time, the surrounding rock and soil can provide natural protection, improving the safety and reliability of the hydrogen storage structure.

[0030] The above description is merely an overview of the technical solution of this utility model. To better understand the technical means of this utility model and to enable its implementation according to the description, the preferred embodiments of this utility model are described in detail below with reference to the accompanying drawings. Specific implementation methods of this utility model are given in detail in the following embodiments and their accompanying drawings. Attached Figure Description

[0031] The accompanying drawings, which are included to provide a further understanding of the present invention and form part of this application, illustrate exemplary embodiments of the present invention and, together with the description thereof, serve to explain the present invention and do not constitute an undue limitation thereof. In the drawings:

[0032] Figure 1 A schematic diagram of an embodiment of the underground large-scale hydrogen storage structure provided by this utility model;

[0033] Figure 2 for Figure 1 Top view of the middle cylinder structure;

[0034] Figure 3 for Figure 1 A three-dimensional schematic diagram of prefabricated cylindrical segments;

[0035] Figure 4 for Figure 1 A three-dimensional schematic diagram of the structure of the central sealing door;

[0036] Figure 5 for Figure 1 Top view of the central sealing door structure;

[0037] Figure 6 for Figure 1 Front view of the pull-out anchor bolt and filter pipe;

[0038] Figure 7 for Figure 1 A three-dimensional schematic diagram of the pull-out anchor bolt and filter pipe;

[0039] Figure 8 for Figure 1 A partial schematic diagram of a pull-out anchor bolt;

[0040] Figure 9 for Figure 1 Schematic diagram of the construction process of medium-strength composite anchor piles.

[0041] Explanation of reference numerals in the attached figures:

[0042] 1-Concrete lining layer, 11-Cylinder structure, 111-Precast cylinder segment, 1111-Groove, 1112-Prestressed tendon duct, 112-Prestressed tendon;

[0043] 2- Concrete base slab;

[0044] 3-Sealed structure, 31-Sliding buffer layer, 32-Hydrogen barrier sealing layer;

[0045] 4-Sealing device; 41-Inflation / depression channel;

[0046] 5-Sealed door structure, 51-Door frame, 52-Sealed door, 521-Rotating shaft, 53-Drive mechanism, 531-First gear, 532-Second gear, 533-Drive motor, 54-Sealing ring;

[0047] 6-Anti-pull-out composite anchor pile, 61-Anti-pull-out anchor, 611-Conical end plate;

[0048] 7-Filter pipe;

[0049] 8-Filter media. Detailed Implementation

[0050] The preferred embodiments of the present invention will now be described in detail with reference to the accompanying drawings, which constitute a 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.

[0051] Please see Figure 1The local large-scale underground hydrogen storage structure includes a storage body, a sealing structure 3, and a sealing device 4. The storage body is for underground installation and includes a concrete lining layer 1 and a concrete base slab 2. The concrete lining layer 1 has a cavity with openings at both the top and bottom. The concrete base slab 2 is located at the bottom of the concrete lining layer 1 to seal the lower end of the cavity. The sealing structure 3 is laid inside the cavity to seal it. The sealing device 4 is located at the top of the concrete lining layer 1 and is sealed to the upper end of the cavity. The sealing device 4 and the storage body together enclose a hydrogen storage space. The sealing device 4 also has a gas filling and releasing channel 41 that connects to the hydrogen storage space.

[0052] The underground large-scale hydrogen storage structure provided by this utility model includes a concrete lining layer 1 and a concrete base slab 2. The concrete lining layer 1 has a cavity with openings at both the top and bottom. The concrete base slab 2 is located at the bottom of the concrete lining layer 1 to seal the lower end of the cavity. A sealing structure 3 is laid inside the cavity to seal it. A sealing device 4 is located at the top of the concrete lining layer 1 and is sealed to the upper end of the cavity. The sealing device 4 and the storage body together enclose a hydrogen storage space. The sealing device 4 also has a gas filling and releasing channel 41 connecting the hydrogen storage space. The storage body made by the concrete lining layer 1 and the concrete base slab 2 can be pre-buried in various terrains regardless of topography to form a hydrogen storage tank. Since the hydrogen storage structure is located underground, it can take advantage of the relatively stable underground temperature, humidity and other environmental factors to achieve safe storage. At the same time, the surrounding rock and soil can provide natural protection, improving the safety and reliability of the hydrogen storage structure.

[0053] Further, please see Figures 1 to 3In this embodiment, the concrete lining layer 1 includes a plurality of cylindrical structures 11, which are sequentially connected in a vertical direction, and a connecting structure is provided between two adjacent cylindrical structures 11. The connecting structure includes a tenon and a mortise that cooperate with each other. The tenon is provided in the upper cylindrical structure 11 of the two cylindrical structures 11, and the mortise is provided in the lower cylindrical structure 11 of the two cylindrical structures 11. Specifically, the cylindrical structure 11 is generally annular, and multiple cylindrical structures 11 are sequentially spliced ​​along the vertical direction to form the main structure of the concrete lining layer 1. Each cylindrical structure 11 has a tenon on its lower end face and a mortise on its upper end face. The tenon and the mortise are fitted together to limit the circumferential movement of the cylindrical structure 11 and prevent it from moving horizontally. Since the uppermost and lowermost cylindrical structures 11 do not require mortise and tenon fitting, the uppermost cylindrical structure 11 does not have a mortise, and the lowermost cylindrical structure 11 does not have a tenon.

[0054] Furthermore, an asphalt layer is laid inside the tenon groove, which enhances the overall structural integrity.

[0055] Further, please see Figure 3 In this embodiment, the specific composition of the cylindrical structure 11 is not limited. In this embodiment, the cylindrical structure 11 includes multiple precast cylindrical segments 111 and multiple prestressing tendons 112. The precast cylindrical segments 111 are arranged in an arc shape. The multiple precast cylindrical segments 111 are connected sequentially along the circumference. Each precast cylindrical segment 111 has a prestressing tendon 112 channel 1112 passing through it along its circumference. The outer sides of both ends of the precast cylindrical segment 111 are provided with grooves 1111. The grooves 1111 communicate with the prestressing tendon 112 channels 1112. Each prestressing tendon 112 passes through two adjacent prestressing tendon 112 channels 1112. Both ends of the prestressing tendon 112 are fixed to the sidewall of the groove 1111 by anchors. The prestressing tendon 112 is used to fix two adjacent precast cylindrical segments 111. A ring structure is formed by splicing multiple prefabricated cylindrical sections 111 circumferentially, and then the prestressed tendons 112 are connected and fixed in pairs, thereby fixing the entire cylindrical structure 11. The grooves 1111 are provided to facilitate the anchorage to fix the prestressed tendons 112.

[0056] Specifically, each of the precast cylindrical pieces 111 has an arc-shaped groove at its top and an arc-shaped protrusion at its bottom. Multiple arc-shaped grooves together form the tenon groove, and multiple arc-shaped protrusions together form the tenon.

[0057] Specifically, in this embodiment, there are four precast cylindrical segments 111 and four prestressing tendons 112.

[0058] Furthermore, in order to improve the connection strength between two adjacent precast cylindrical segments 111, two prestressing tendon 112 channels 1112 are provided, and the two prestressing tendon 112 channels 1112 are arranged at intervals in the vertical direction. That is, each prestressing tendon 112 channel 1112 is provided with a prestressing tendon 112. The two prestressing tendons 112 connect the two adjacent precast cylindrical segments 111, thereby enhancing their connection strength.

[0059] Furthermore, in order to improve the waterproofing effect, in this embodiment, a slow-expansion water-swellable waterstop strip is also pre-embedded in the splice joint between two adjacent precast cylindrical sections 111. This setting can improve its waterproofing effect.

[0060] Furthermore, to facilitate subsequent maintenance of the storage chamber, in this embodiment, the sealing device 4 is also provided with an opening connecting to the hydrogen storage space; the underground large-scale hydrogen storage structure also includes a sealing door 52 structure 5, which is located at the opening and used to open and close the opening. By providing the opening, it is convenient for personnel to enter the storage chamber for maintenance in the future, while the sealing door 52 structure 5 can seal the opening when storing hydrogen.

[0061] Further, please see Figures 4 to 5 In this embodiment, the sealing door 52 structure 5 includes a door frame 51, a sealing door 52, a drive mechanism 53, and a sealing ring 54. The door frame 51 is located on the periphery of the opening, and a sealing groove is provided around the circumference of the door frame 51. One end of the sealing door 52 is rotatably mounted on one side of the door frame 51 along a horizontal axis. The drive mechanism 53 is connected to the sealing door 52 and is used to drive the sealing door 52 to rotate. The sealing ring 54 is located in the sealing groove so that when the sealing door 52 closes the opening, a portion of the sealing door 52 extends into the sealing groove and abuts against the sealing ring 54.

[0062] Furthermore, in order to improve the connection strength between the door frame 51 and the sealing device 4, in this embodiment, the door frame 51 is provided with connectors on all four sides, and the connectors are located inside the sealing device 4. This arrangement can enhance the connection strength between the door frame 51 and the sealing device 4.

[0063] Further, please see Figures 4 to 5The door frame 51 has a pivot hole 521 on one side, and the sealing door 52 has a pivot hole 521 at one end. The pivot hole 521 is rotatably installed in the pivot hole 521. The drive mechanism 53 includes a first gear 531, a second gear 532, and a drive motor 533. The first gear 531 is rotatably installed on the door frame 51, and the second gear 532 is fixedly installed on the pivot hole 521. The first gear 531 and the second gear 532 mesh. The drive motor 533 is connected to the first gear 531 and is used to drive the first gear 531 to rotate. Specifically, the sealing door 52 is semi-circular in shape. The rotating shaft 521 is located at one end of the sealing door 52 in a straight line. Both ends of the door frame 51 have protrusions, and each protrusion has a hole for the rotating shaft 521. The rotating shaft 521 is located between two holes, and both ends of the rotating shaft 521 are rotatably mounted in the holes via bearings. One end of the rotating shaft 521 extends out of the hole and is fixedly connected to the second gear 532. Since the first gear 531 meshes with the second gear 532, when the drive motor 533 drives the first gear 531 to rotate, it can drive the rotating shaft 521 to rotate, thereby driving the sealing door 52 to rotate, achieving the purpose of opening and closing the opening. When the sealing door 52 closes the opening, part of the sealing door 52 can penetrate into the sealing groove and abut against the sealing ring 54, achieving a better sealing effect.

[0064] Further, please see Figure 1 In this embodiment, the sealing structure 3 includes a sliding buffer layer 31 and a hydrogen barrier sealing layer 32. The sliding buffer layer 31 is bonded to the inner surface of the cavity with epoxy resin adhesive, and the hydrogen barrier sealing layer 32 is bonded to the hydrogen-facing side of the sliding buffer layer 31 with epoxy resin adhesive. The sliding buffer layer 31 is a high-damping rubber with a thickness of 10-50 mm; the hydrogen barrier sealing layer 32 is a polyvinyl alcohol film with a thickness of 3-10 mm; the epoxy resin adhesive uses a bisphenol A type epoxy resin matrix and is doped with 5% by mass of alumina and 5% by mass of boron nitride nanosheets.

[0065] Further, please see Figure 1 , Figure 6 and Figure 9In this embodiment, multiple anti-pull-out composite anchor piles 6 are provided at the bottom of the concrete base slab 2 and the bottom of the sealing device 4. The anti-pull-out composite anchor piles 6 are used to be embedded in the ground to fix the concrete base slab 2 and the sealing device 4. Specifically, before pouring the concrete base slab 2, multiple dewatering wells are first set at the bottom of the foundation pit. Anti-pull-out anchor rods 61 and filter pipes 7 are inserted in the middle of the dewatering wells. The filter pipes 7 have multiple filter holes around their circumference. Then, filter material 8 is filled into the gap between the anti-pull-out anchor rods 61, the filter pipes 7, and the dewatering wells. By setting the filter pipes 7, groundwater flows through the filter material 8 into the filter pipes 7. The groundwater in the filter pipes 7 is then pumped away by a water pump, thus lowering the groundwater level. After dewatering is completed, the filter pipes 7 are removed, and cement grout is injected into the remaining holes in the filter pipes 7 to form an anti-pull-out composite anchor pile 6 with the anti-pull-out anchor rods 61. Similarly, the same construction method is used when installing the sealing device 4, which will not be elaborated here.

[0066] Furthermore, the filter media 8 is medium-coarse sand with a particle size of 2mm to 5mm.

[0067] Furthermore, for the convenience of installing the pull-out anchor 61 and the filter pipe 7, please refer to [link to relevant documentation]. Figures 7 to 8 In this embodiment, the outer side of the filter pipe 7 is provided with a plurality of fixing rings with a diameter matching that of the pull-out anchor rod 61. The plurality of fixing rings are arranged at intervals in the vertical direction, and the pull-out anchor rod 61 passes through the plurality of fixing rings.

[0068] Furthermore, the pull-out anchor 61 is a prestressed steel strand or a high-strength steel bar.

[0069] Further, please see Figures 7 to 8 The lower end of the anti-pull-out anchor rod 61 is provided with a tapered end plate 611, and the surface of the tapered end plate 611 is provided with a positioning groove, and the lower end of the filter pipe 7 is embedded in the positioning groove.

[0070] Furthermore, the plurality of filter holes are arranged in multiple spiral rows, and the outer side of the filter pipe 7 is wrapped with a filter screen, which is used for filtration.

[0071] Further, please see Figure 1 In this embodiment, the sealing device 4 is a reinforced concrete structure, and the cross-sectional area of ​​the sealing device 4 is larger than the cross-sectional area of ​​the concrete lining layer 1. This arrangement facilitates the installation of the tension-resistant composite anchor pile 6 at the bottom of the sealing device 4, avoiding interference between the tension-resistant composite anchor pile 6 and the concrete lining layer.

[0072] Furthermore, the connection method between the sealing device 4 and the anti-pull-out composite anchor pile 6 is not limited. In this embodiment, the circumference of the sealing device 4 is provided with multiple anchoring grooves. One end of the anti-pull-out anchor 61 is fixed in the anchoring groove by an anchor, and the other end extends through the sealing device 4 into the ground. The anchoring groove is filled and smoothed with micro-expansion concrete after the anti-pull-out anchor 61 is tensioned.

[0073] In addition, this utility model also provides a construction method for an underground large-scale hydrogen storage structure, which includes the following steps:

[0074] S1. Fabricate precast cylindrical plates 111 and sealing device 4, and fabricate cylindrical structure 11 using precast cylindrical plates 111;

[0075] Specifically, the precast cylindrical segment 111 is fabricated as follows: according to the design drawings, the steel bars of the precast cylindrical segment 111 are cut and tied to complete the fabrication of the steel cage of the precast cylindrical segment 111; then the wooden formwork is processed and installed, and the prestressing tendon 112 holes 1112, grooves 1111, arc-shaped protrusions and arc-shaped grooves of the precast cylindrical segment 111 are reserved; finally, the precast cylindrical segment 111 is poured with concrete, vibrated to compact, and watered for curing.

[0076] Fabrication of sealing device 4: According to the design drawings, the steel bars of sealing device 4 are cut and tied to complete the fabrication of the steel cage of sealing device 4. Then, the wooden template is processed and installed. The sealing door 52 structure 5 is installed at the corresponding position of sealing device 4 and the anchoring groove is reserved. Finally, concrete is poured into sealing device 4, vibrated to compact and watered for curing.

[0077] Fabrication of the cylindrical structure 11: Precast cylindrical segments 111 are spliced ​​together in pairs in a circumferential manner and fixed by prestressing tendons 112 passing through them to form a cylindrical structure 11. After the prestressing tendons 112 are tensioned, the grooves 1111 are filled and smoothed with micro-expansion concrete.

[0078] S2. Level the site, excavate the guide trench, and set up multiple sets of dewatering wells around the concrete lining layer to reduce groundwater, and use the dewatering wells to make anti-pull-out composite anchor piles 6.

[0079] Specifically, the site is leveled, the construction axis of the cylindrical structure 11 is positioned, a guide trench is excavated, multiple sets of dewatering wells are set around the concrete lining layer 1 to reduce groundwater, a drilling rig is used to construct the dewatering well holes, after the well holes are constructed, anti-pull-out anchor rods 61 and filter pipes 7 are lowered, then filter material 8 is added to filter impurities, and pumping pipes and pumping pumps are installed for dewatering.

[0080] S3. Immerse the cylindrical structure 11 and splice the cylindrical structure 11 in sequence to form a concrete lining layer.

[0081] Specifically, the soil inside the cylindrical structure 11 is excavated, the cylindrical structure 11 is slowly lowered, and an asphalt layer is applied to the tenon and groove surface of the cylindrical structure 11. The cylindrical structure 11 is spliced ​​and positioned vertically through the tenon and groove, and finally a concrete lining layer 1 is formed.

[0082] S4. Multiple sets of dewatering wells are set at the bottom of the concrete lining layer 1 to reduce groundwater, and anti-uplift composite anchor piles 6 are made using the dewatering wells. The concrete base slab 2 is then poured so that the concrete base slab 2 and the anti-uplift composite anchor piles 6 form an integral whole.

[0083] Specifically, multiple sets of dewatering wells are set at the bottom of the concrete lining layer 1 to lower the groundwater level. A drilling rig is used to construct the dewatering well holes. After the well holes are constructed, anti-pull anchor rods 61 and filter pipes 7 are lowered. Then, filter material 8 is added to filter impurities. A pumping pipe and a pumping pump are installed to dewater. After dewatering is completed, the filter pipe 7 is pulled out. Cement grout is injected into the gap left after the filter pipe 7 is pulled out using a grouting machine. Then, the anti-pull anchor rods 61 are tensioned and anchored to form an anti-pull composite anchor pile 6. Finally, the concrete base slab 2 is poured to form an integral structure.

[0084] S5. Adhere the sealing structure 3 to the inner side of the concrete lining layer 1 and the concrete base slab 2.

[0085] Specifically, the inner side of the concrete lining layer 1 is ground and cleaned, epoxy resin is applied to attach and fix the sliding buffer layer 31, and then the hydrogen barrier sealing layer 32 is attached and fixed with epoxy resin.

[0086] S6. Multiple sets of dewatering wells are set on the top periphery of the concrete lining layer 1 to reduce groundwater, and the dewatering wells are used to make anti-uplift composite anchor piles 6.

[0087] The site was leveled, and the sealing device 4 was installed at the open face of the hydrogen storage structure. Multiple sets of dewatering wells were set up around the sealing device 4 to lower the groundwater level. The well holes of the dewatering wells were constructed using a drilling rig. After the well holes were constructed, the pull-out anchor rods 61 and the filter pipes 7 were lowered. Then, the filter material 8 was put in to filter impurities. The pumping pipes and pumping pumps were installed to dewater the area. After the dewatering was completed, the filter pipes 7 were pulled out. Cement grout was injected into the gap left after the filter pipes 7 were pulled out using a grouting machine. Then, the pull-out anchor rods 61 were tensioned and anchored to form the pull-out composite anchor piles 6. Finally, the anchoring grooves were filled and smoothed with micro-expansion concrete.

[0088] S7. Install the sealing device 4 on the top of the concrete lining layer 1, and fix the sealing device 4 to the pull-out composite anchor pile 6 to form the entire hydrogen storage structure.

[0089] The hydrogen storage structure of this utility model is located underground, which can take advantage of the relatively stable environmental factors such as underground temperature and humidity to achieve safe storage. At the same time, the surrounding rock and soil can provide a natural enclosure effect, improving the safety and reliability of the hydrogen storage structure.

[0090] The hydrogen storage structure in this utility model is a prefabricated structure, manufactured in a factory assembly line, ensuring stable and controllable quality. Simultaneously, prestressing is applied through unbonded prestressed tendons 112 to increase the rigidity of the components, thereby offsetting or reducing the internal forces generated by hydrogen and enhancing the safety and stability of the structure. Furthermore, the use of mortise and tenon joints effectively prevents horizontal slippage and separation between the two parts at the interface of the cylinder structure 11, ensuring that the concrete lining layer 1 functions as a unified whole. The addition of an asphalt layer at the mortise and tenon joints enhances overall integrity and provides waterproofing, improving the structure's durability.

[0091] In this invention, the hydrogen storage structure is reinforced by the pull-out anchor 61. The bottom of the pull-out anchor 61 is provided with a tapered end plate 611. When the pull-out anchor 61 is subjected to a pull-out force, in addition to the side friction of the pull-out anchor 61 playing a pull-out role, the resistance of the tapered end plate 611 also plays a pull-out role, thereby improving the stability of the pull-out anchor 61 and solving the problem that the anchor cannot withstand large tensile stress. This effectively prevents the sealing device 4 from being blown out during the circulation injection and extraction of hydrogen, thus preventing a safety accident.

[0092] In this invention, the pull-out anchor 61 and the filter pipe 7 are lowered together into the dewatering well. After dewatering is completed, the filter pipe 7 is pulled out. The pores formed after the filter pipe 7 is pulled out can be filled with cement grout. The cement grout seeps into the pores of the filter material 8 and solidifies, effectively connecting the pull-out anchor 61 and the cement pile as one unit, making it also serve as a pull-out composite anchor pile 6 during the project operation period. This reduces the investment in pull-out measures and greatly saves construction time and project costs.

[0093] This utility model features a hydrogen storage structure with strong on-site construction operability, high degree of component assembly, high work efficiency, excellent waterproofing, good overall structural performance and construction quality. It also incorporates dewatering wells as anti-pull-out composite anchor piles, enhancing pull-out resistance. The project cost is relatively low, and it is energy-saving and environmentally friendly, making it highly valuable for widespread application.

[0094] The hydrogen storage structure of this invention enables large-scale hydrogen storage, making up for the weakness in hydrogen storage in the hydrogen energy industry and promoting the rapid development of my country's hydrogen energy industry.

[0095] In the description of this application, it should be noted that directional indicators (such as up, down, left, right, front, back, etc.) are used only to explain the relative positional relationships and movement of the components in a specific posture (as shown in the accompanying drawings). If the specific posture changes, the directional indicators will also change accordingly. Unless otherwise explicitly specified and limited, the terms "installed," "connected," and "linked" should be interpreted broadly. For example, they can refer to fixed connections, detachable connections, or integral connections; they can refer to mechanical connections or electrical connections; they can refer to direct connections or indirect connections through an intermediate medium; and they can refer to the internal communication between two components. Those skilled in the art can understand the specific meaning of the above terms in this application according to the specific circumstances.

[0096] It should be noted that in this application, relational terms such as "first" and "second" are used merely to distinguish one entity or operation from another, and do not necessarily require or imply any such actual relationship or order between these entities or operations. Furthermore, the terms "comprising," "including," or any other variations thereof are intended to cover non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements includes not only those elements but also other elements not expressly listed, or elements inherent to such a process, method, article, or apparatus. Without further limitations, an element defined by the phrase "comprising one..." does not exclude the presence of other identical elements in the process, method, article, or apparatus that includes said element. Additionally, the meaning of "and / or" throughout the text includes three parallel options; for example, "A and / or B" includes option A, option B, or options where both A and B are satisfied simultaneously. Furthermore, the technical solutions of the various embodiments can be combined with each other, but this must be based on the ability of those skilled in the art to implement them. When the combination of technical solutions is contradictory or cannot be implemented, it should be considered that such combination of technical solutions does not exist and is not within the scope of protection claimed by this utility model.

[0097] The above description is only a preferred embodiment of the present utility model, but the protection scope of the present utility model is not limited thereto. Any changes or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in the present utility model should be included within the protection scope of the present utility model.

Claims

1. A structure for a large-scale underground hydrogen storage facility, characterized in that, It includes: The tank body is designed for underground installation. The tank body includes a concrete lining layer and a concrete base slab. The concrete lining layer has a cavity with openings at both the top and bottom. The concrete base slab is located at the bottom of the concrete lining layer to seal the lower end of the cavity. A sealing structure is laid inside the cavity to seal the cavity; as well as A sealing device is located on top of the concrete lining layer and is sealed to the upper end of the cavity. The sealing device and the storage body together enclose a hydrogen storage space. The sealing device is also provided with a gas filling and releasing channel that connects to the hydrogen storage space.

2. The underground large-scale hydrogen storage structure according to claim 1, characterized in that, The concrete lining layer includes multiple cylindrical structures, which are connected sequentially in a vertical direction. A connecting structure is provided between two adjacent cylindrical structures. The connecting structure includes a tenon and a mortise that cooperate with each other. The tenon is located on the upper cylindrical structure of the two cylindrical structures, and the mortise is located on the lower cylindrical structure of the two cylindrical structures.

3. The underground large-scale hydrogen storage structure according to claim 2, characterized in that, The cylindrical structure includes multiple precast cylindrical segments and multiple prestressing tendons. The precast cylindrical segments are arranged in an arc shape and are connected sequentially along the circumference. Each precast cylindrical segment has a prestressing tendon channel passing through it along the circumference. The outer sides of both ends of the precast cylindrical segment are provided with grooves that connect to the prestressing tendon channels. Each prestressing tendon passes through two adjacent prestressing tendon channels. Both ends of the prestressing tendon are fixed to the sidewall of the groove by anchors. The prestressing tendon is used to fix two adjacent precast cylindrical segments.

4. The underground large-scale hydrogen storage structure according to claim 1, characterized in that, The sealing device is also provided with an opening that connects to the hydrogen storage space; The underground large-scale hydrogen storage structure also includes a sealed door structure, which is located at the opening and used to open and close the opening.

5. The underground large-scale hydrogen storage structure according to claim 4, characterized in that, The sealing door structure includes a door frame, a sealing door, a drive mechanism, and a sealing ring. The door frame is located around the opening, and a sealing groove is provided around the circumference of the door frame. One end of the sealing door is rotatably mounted on one side of the door frame along a horizontal axis. The drive mechanism is connected to the sealing door and is used to drive the sealing door to rotate. The sealing ring is located in the sealing groove so that when the sealing door closes the opening, a portion of the sealing door extends into the sealing groove and abuts against the sealing ring.

6. The underground large-scale hydrogen storage structure according to claim 5, characterized in that, A pivot hole is provided on one side of the door frame, and a pivot is provided at one end of the sealed door. The pivot is rotatably installed in the pivot hole. The driving mechanism includes a first gear, a second gear, and a drive motor. The first gear is rotatably mounted on the door frame, and the second gear is fixedly mounted on the rotating shaft. The first gear and the second gear mesh with each other. The drive motor is connected to the first gear and is used to drive the first gear to rotate.

7. The underground large-scale hydrogen storage structure according to claim 1, characterized in that, The sealing structure includes a sliding buffer layer and a hydrogen barrier sealing layer. The sliding buffer layer is bonded to the inner surface of the cavity with epoxy resin adhesive, and the hydrogen barrier sealing layer is bonded to the hydrogen-facing side of the sliding buffer layer with epoxy resin adhesive. The sliding buffer layer is made of high-damping rubber with a thickness of 10–50 mm; the hydrogen-blocking sealing layer is made of polyvinyl alcohol film with a thickness of 3–10 mm.

8. The underground large-scale hydrogen storage structure according to claim 1, characterized in that, The bottom of the concrete base slab and the bottom of the sealing device are provided with multiple anti-pull-out composite anchor piles, which are used to be embedded in the ground to fix the concrete base slab and the sealing device.

9. The underground large-scale hydrogen storage structure according to claim 1, characterized in that, The sealing device is a reinforced concrete structure, and the cross-sectional area of ​​the sealing device is larger than the cross-sectional area of ​​the concrete lining layer.

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