LNG storage tank

Abstract

The invention relates to the technical field of energy storage, in particular to an LNG storage tank which comprises a tank body, the tank body comprises an inner tank and an outer tank arranged on the outer side of the inner tank in a sleeving mode, a heat insulation layer is arranged between the outer side of the inner tank and the inner side of the outer tank, and the outer tank is of a multi-layer structure; the multi-layer structure comprises an inner steel plate, an outer steel plate and core filling concrete filled between the inner steel plate and the outer steel plate; the dome structure is arranged at the tops of the inner tank and the outer tank; and the bottom supporting structure is located below the tank body, the top of the bottom supporting structure is connected with the bottom of the inner tank through a heat insulation layer, and the bottom of the bottom supporting structure is connected to a pile group foundation structure fixed to the ground. The LNG storage system is used for overcoming the defect that in the prior art, the structural strength and the construction period are difficult to consider at the same time, and a more efficient, safer and economical LNG storage solution is achieved.

Description

Technical Field

[0001] The present invention relates to the technical field of energy storage, and particularly to an LNG storage tank. Background Art

[0002] With the increasing global emphasis on energy environmental protection, the demand for clean energy has been continuously growing, which has promoted the development of safe and efficient energy storage technologies. Liquefied natural gas (LNG), as an important clean energy, has received particular attention in its storage technology. Currently, the design of LNG storage tanks mainly focuses on two types: fully contained prestressed concrete storage tanks and membrane tanks.

[0003] Fully contained prestressed concrete storage tanks are the most widely used LNG storage solutions at present. They usually use specific alloy steel as the material for the inner tank, while the outer tank is constructed of prestressed concrete. In contrast, membrane tanks use a thinner and lighter stainless steel structure as the inner tank, which only responsible for maintaining airtightness and liquid tightness, and transfer the load to the external load-bearing structure through the insulation layer.

[0004] Due to the characteristics of less consumption of inner tank materials, shorter construction period and theoretically greater expansion possibility, membrane tanks have become an attractive option. However, when it comes to large storage tanks, this design places higher requirements on the outer tank that supports it, because the inner tank does not directly bear the structural load. This means that traditional prestressed concrete structures must continuously strengthen their own size, steel bar configuration and prestress setting when facing larger capacity storage tanks, thus making it difficult to balance the relationship between structural performance and construction efficiency. Summary of the Invention

[0005] The present invention provides an LNG storage tank to solve the defect in the prior art that it is difficult to balance structural strength and construction period, and to achieve a more efficient, safe and economical LNG storage solution.

[0006] The present invention provides an LNG storage tank, including: a tank body, the tank body includes an inner tank and an outer tank sleeved outside the inner tank, an insulation layer is provided between the outer side of the inner tank and the inner side of the outer tank, the outer tank has a multi-layer structure, the multi-layer structure includes an inner steel plate, an outer steel plate and core-filled concrete filled between the inner steel plate and the outer steel plate; a dome structure, arranged at the top of the inner tank and the outer tank; a bottom support structure, located below the tank body, the top of the bottom support structure is connected to the bottom of the inner tank through the insulation layer, and the bottom of the bottom support structure is connected to a group pile foundation structure fixed to the ground.

[0007] According to an embodiment of the present invention, the insulation layer is made of polyurethane foam material.

[0008] According to an embodiment of the present invention, the dome structure includes: an aluminum alloy ceiling, disposed at the top of the inner tank; and a concrete dome, disposed above the aluminum alloy ceiling.

[0009] According to an embodiment of the present invention, the cross-sectional shape of the inner tank is polygonal, and the polygonal inner tank is formed by splicing a plurality of corrugated stainless steel thin-layer units.

[0010] According to an embodiment of the present invention, the thickness of the corrugated stainless steel thin-layer unit is 1.2 - 2 mm; and / or, the number of sides of the polygon of the cross-section of the inner tank is a multiple of 12.

[0011] According to an embodiment of the present invention, the thickness of the inner steel plate and the outer steel plate is 5 - 10 mm; and / or, the thickness of the core-filled concrete is 400 - 1000 mm.

[0012] According to an embodiment of the present invention, the outer tank is formed by splicing a plurality of precast double-steel plate concrete units; each of the double-steel plate concrete units includes the multi-layer structure, and a corresponding connection structure is provided between adjacent double-steel plate concrete units.

[0013] According to an embodiment of the present invention, the types of the double-steel plate concrete units include: corner units, the cross-section of the corner units is in a broken line shape, corresponding to the polygonal corner parts of the outer tank; flat units, the cross-section of the flat units is in a straight line shape, and are spliced between the corner units.

[0014] According to an embodiment of the present invention, the connection structure includes: butt welds; and / or, in two adjacent double-steel plate concrete units, one is provided with connecting steel bars extending towards the other, and the other is provided with reserved holes matching the connecting steel bars, and the reserved holes are coated with an adhesive for bonding the connecting steel bars.

[0015] According to an embodiment of the present invention, a positioning structure is further provided on the double-steel plate concrete unit, and the positioning structure includes: positioning ear plates, symmetrically disposed on the inner and outer sides of the double-steel plate concrete unit; positioning bolts, for passing through the positioning ear plates of two adjacent double-steel plate concrete units and being fixed by nuts.

[0016] The LNG storage tank provided by the present invention, through the double-layer structure design of the inner tank and the outer tank, and introducing a multi-layer structure (including the inner steel plate, the outer steel plate and the core concrete between the two) in the outer tank, not only enhances the overall structural strength of the storage tank, but also effectively solves the structural safety risks and size increase problems faced by traditional prestressed reinforced concrete outer tanks during the process of large-scale development. In addition, the design of the dome structure and the bottom support structure further improves the stability and safety of the storage tank. At the same time, the application of the insulation layer ensures the thermal insulation effect between the inner and outer tanks and reduces the cold loss. Since both the outer tank and the inner tank can be prefabricated in large-scale factories, the on-site construction time and complexity are significantly reduced, thus shortening the construction period and improving the controllability of the project quality. Therefore, this LNG storage tank achieves an effective balance between structural strength and construction efficiency, providing a more efficient, safer and more economical LNG storage solution. BRIEF DESCRIPTION OF THE DRAWINGS

[0017] In order to more clearly illustrate the technical solutions in the present invention or the prior art, the following will briefly introduce the drawings required for use in the description of the embodiments or the prior art. Obviously, the drawings in the following description are some embodiments of the present invention. For those of ordinary skill in the art, without creative efforts, other drawings can be obtained based on these drawings.

[0018] Figure 1 It is a schematic structural diagram of the LNG storage tank provided by the present invention.

[0019] Figure 2 It is a schematic partial sectional structural diagram of the LNG storage tank provided by the present invention.

[0020] Figure 3 It is a schematic cross-sectional structural diagram of the LNG storage tank provided by the present invention.

[0021] Figure 4 It is one of the schematic diagrams of the splicing of the corner of the polygonal outer tank and the flat plate unit of the LNG storage tank provided by the present invention.

[0022] Figure 5 It is another schematic diagram of the splicing of the corner of the polygonal outer tank and the flat plate unit of the LNG storage tank provided by the present invention.

[0023] Figure 6 It is one of the schematic diagrams of the connection and positioning structure of the double-steel plate concrete outer tank of the LNG storage tank provided by the present invention.

[0024] Figure 7 It is another schematic diagram of the connection and positioning structure of the double-steel plate concrete outer tank of the LNG storage tank provided by the present invention.

[0025] Reference numerals: 10. Inner tank; 11. Thermal insulation layer; 20. Outer tank; 21. Inner steel plate; 22. Outer steel plate; 23. Filled core concrete; 24. Corner unit; 25. Flat plate unit; 26. Connecting steel bars; 27. Reserved hole; 28. Positioning ear plate; 29. Positioning bolt; 291. Nut; 30. Bottom support structure; 41. Aluminum alloy ceiling; 42. Concrete dome. Detailed implementation manners

[0026] To make the objectives, technical solutions and advantages of the present invention clearer, the technical solutions in the present invention will be clearly and completely described below with reference to the accompanying drawings in the present invention. Apparently, the described embodiments are some but not all of the embodiments of the present invention. All other embodiments obtained by those of ordinary skill in the art without making creative efforts based on the embodiments in the present invention belong to the scope of protection of the present invention.

[0027] In the description of the embodiments of the present invention, it should be noted that the orientation or positional relationships indicated by the terms "center", "longitudinal", "transverse", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the orientation or positional relationships shown in the drawings, and are only for the convenience of describing the embodiments of the present invention and simplifying the description, rather than indicating or implying that the device or element referred to must have a specific orientation, be constructed and operated in a specific orientation, and thus should not be construed as a limitation to the embodiments of the present invention. In addition, the terms "first", "second", and "third" are only used for descriptive purposes and cannot be construed as indicating or implying relative importance. It should also be noted that in the description of the present invention, unless otherwise clearly defined and limited, the terms "set", "installed", and "connected" should be understood in a broad sense. For example, it can be a fixed connection, a detachable connection, or an integral connection. For those skilled in the art, the specific meanings of the above terms in the present invention can be understood according to specific situations.

[0028] The present invention proposes an innovative LNG storage tank structure, which combines a stainless steel thin-film inner tank and a double-steel-plate concrete outer tank, aiming to meet the development needs of large-scale LNG storage tanks, improve safety and efficiency. By giving full play to the expandability of the stainless steel thin-film inner tank and the excellent bearing capacity and safety of the double-steel-plate concrete outer tank, the present invention not only solves the problem of excessive pressure on the traditional prestressed reinforced concrete outer tank caused by ultra-large LNG thin-film tanks, but also effectively addresses the challenges such as structural safety risks, size increase, and construction period extension caused thereby. In addition, the large-scale prefabrication method of the inner and outer tanks in engineering factories greatly reduces the on-site operation volume and improves the controllability of the engineering quality, thus providing a more efficient, safer and more economical LNG storage solution.

[0029] The following combinationFigures 1 to 7 Describe the specific implementation of the LNG storage tank of the present invention.

[0030] As Figure 1 and Figure 2 shown, the present invention provides an LNG storage tank, including: a tank body, the tank body includes an inner tank 10 and an outer tank 20 sleeved outside the inner tank 10, an insulating layer 11 is provided between the outside of the inner tank 10 and the inside of the outer tank 20, the outer tank 20 has a multi-layer structure, the multi-layer structure includes an inner steel plate 21, an outer steel plate 22, and core-filled concrete 23 filled between the inner steel plate 21 and the outer steel plate 22; a dome structure, arranged at the top of the inner tank 10 and the outer tank 20; a bottom support structure 30, located below the tank body, the top of the bottom support structure 30 is connected to the bottom of the inner tank 10 through the insulating layer 11, and the bottom of the bottom support structure 30 is connected to a group pile foundation structure fixed on the ground. Among them, the inner steel plate 21 constitutes the inner structure of the outer tank 20, and the outer steel plate 22 constitutes the outer structure of the outer tank 20. Both can be made of steel materials, such as stainless steel or carbon steel, etc. The core-filled concrete 23 is filled between the inner and outer steel plates 22, and usually concrete materials with a strength grade of C30 to C50 are used. The above combination ensures that the outer tank 20 has excellent structural strength and durability.

[0031] Specifically, the inner tank 10 adopts stainless steel film technology, ensuring the airtightness and liquid tightness inside the tank, and due to its lightweight characteristics, it can reduce the overall structural burden. The outer tank 20 adopts a double-steel plate sandwich structure, with high-strength core-filled concrete 23 filled in the middle, which not only enhances the structural stability of the storage tank, but also provides good heat insulation effect, effectively preventing external heat from invading, and ensuring the safety and efficiency of LNG storage. The presence of the insulating layer 11 further improves the heat insulation performance, reduces energy loss, and at the same time isolates the direct contact between the inner and outer tanks 20, avoiding potential damage to the structure caused by cold transfer. In addition, the combination of the bottom support structure 30 and the group pile foundation structure ensures the stability and safety of the storage tank under various environmental conditions.

[0032] Furthermore, the LNG storage tank of the present invention can introduce prefabrication technology and modular construction methods to achieve large-scale factory prefabrication of the inner and outer tanks 20, so as to simplify the on-site installation process, shorten the construction period, and reduce the construction difficulty and cost. Especially for the double-steel plate concrete structure of the outer tank 20, most of the manufacturing processes are completed in the factory in advance, which can better control the quality and improve the reliability and consistency of the project. In addition, for different geological conditions, the bottom support structure 30 and the group pile foundation can be customized according to actual needs to ensure the firm foundation of the storage tank and adapt to various complex geographical environments.

[0033] The above-mentioned thermal insulation layer 11 can be made of various high-efficiency heat insulation materials, such as foam glass, expanded perlite, polystyrene foam (EPS), extruded polystyrene foam (XPS), etc. Preferably, for an LNG storage tank according to the present invention, the thermal insulation layer 11 is made of polyurethane foam, because it has excellent heat insulation performance, good mechanical strength and durability, can effectively reduce cold loss, and ensure the safety and efficiency of LNG storage.

[0034] For an LNG storage tank according to the present invention, the dome structure includes: an aluminum alloy ceiling 41, arranged at the top of the inner tank 10; a concrete dome 42, arranged above the aluminum alloy ceiling 41, serving as the outer top structure of the LNG storage tank. Specifically, the aluminum alloy ceiling 41 not only has a light weight and corrosion resistance, but also can effectively support and protect the top of the inner tank 10, while providing good airtightness and thermal insulation performance. The concrete dome 42 is constructed on the aluminum alloy ceiling 41, serving as the external protective layer of the storage tank, providing additional structural strength and stability, and being able to withstand external environmental pressures, such as wind load, snow load and seismic force, etc. In addition, the combined design between the concrete dome 42 and the aluminum alloy ceiling 41 ensures the effective isolation of the internal and external structures, reduces the influence of external temperature changes on the LNG storage conditions inside the tank, and further enhances the safety and heat preservation effect of the storage tank. Through the design of the double-layer dome structure, both the firmness and durability of the top of the storage tank are guaranteed, and high-efficiency heat insulation is achieved.

[0035] As Figure 3 shown, for an LNG storage tank according to the present invention, the cross-sectional shape of the inner tank 10 is a polygon, and the polygonal inner tank 10 is composed of a plurality of corrugated stainless steel thin-layer units spliced together. Specifically, by adopting the method of prefabrication in the factory and on-site splicing, not only the on-site installation process is simplified, but also the quality and precision of each unit are strictly controlled in a controlled factory environment. The prefabricated production of the corrugated stainless steel thin-layer units can achieve standardization and batch production, reduce material waste and speed up the production speed. On-site, these prefabricated units can be quickly assembled into a complete inner tank 10 structure through efficient splicing technology, greatly shortening the construction period. In addition, the polygonal design helps to optimize the internal space utilization, while the corrugated structure increases the rigidity of the inner tank 10 wall, enhances its ability to resist the internal and external pressure difference, and thus improves the overall safety and stability.

[0036] An LNG storage tank according to the present invention, the thickness of the corrugated stainless steel thin layer unit is preferably 1.2 to 2 mm. This thickness range of the corrugated stainless steel thin layer unit maximally reduces the material weight while ensuring the structural strength, making each unit both strong and easy to handle and install. On the other hand, for the consideration of optimizing space utilization and structural stability, the number of polygon sides of the cross-section of the inner tank 10 is preferably a multiple of 12. The geometric shape of the polygon helps to disperse the external load and improve the compressive capacity of the overall structure. In addition, choosing a multiple of 12 facilitates modular design and standardized production, simplifying the mold making and quality control in the prefabrication process.

[0037] Furthermore, for an LNG storage tank according to the present invention, the thickness of the inner steel plate 21 and the outer steel plate 22 is preferably 5 - 10 mm, which minimizes the overall weight and optimizes the material usage while ensuring the structural strength and durability. This thickness range can provide sufficient rigidity to resist the internal and external pressure difference, while maintaining good weldability and workability, facilitating factory prefabrication and on-site installation. On the other hand, to ensure that the outer tank 20 has excellent load-bearing capacity and heat insulation effect, the thickness of the core-filled concrete 23 is preferably 400 - 1000 mm, which not only enhances the overall structural stability of the storage tank, but also effectively isolates the influence of external temperature changes on the internal LNG storage conditions, reducing the cold loss. It can be understood that by adjusting the thickness of the core-filled concrete 23, it can be flexibly designed according to specific engineering requirements and geological conditions to adapt to LNG storage tank projects with different scales and environmental requirements. The thick core-filled concrete 23 layer can provide an additional safety barrier and improve the ability of the storage tank to resist natural disasters (such as earthquakes, storms, etc.).

[0038] As Figure 6 and Figure 7 shown, for an LNG storage tank according to the present invention, the outer tank 20 is composed of a plurality of prefabricated double-steel-plate concrete units spliced together; each double-steel-plate concrete unit includes a multi-layer structure, and a corresponding connection structure is provided between adjacent double-steel-plate concrete units. Among them, each double-steel-plate concrete unit adopts a multi-layer structure design inside, including an inner steel plate 21, an outer steel plate 22, and core-filled concrete 23 filled between the two. This structure not only provides excellent mechanical strength and stability, but also achieves good heat insulation performance through the thick concrete layer, effectively isolating the influence of external temperature changes on the LNG inside the tank. The selection of the inner steel plate 21 and the outer steel plate 22 ensures the corrosion resistance and compressive capacity of the unit, while the core-filled concrete 23 with a thickness range of 400 - 1000 mm further enhances the overall rigidity and heat insulation effect of the unit.

[0039] Preferably, a specially designed connection structure is provided between adjacent double - steel - plate concrete units to ensure that each unit can form an integral whole after splicing, guaranteeing the sealing performance, stability, and bearing capacity of the outer tank 20. The connection structure can be high - strength bolt connection, welded joints, or special mechanical connectors, etc. The specific choice depends on engineering requirements and construction conditions. The design of the connection structure should not only meet mechanical requirements but also consider the convenience of construction and the possibility of later maintenance. For example, high - strength bolt connection can facilitate disassembly and inspection while ensuring connection strength, which is beneficial to the long - term maintenance and management of the storage tank. In addition, to improve the splicing quality, sealing materials or construction measures can be added to the connection part, such as rubber gaskets or sealant strips, to ensure the airtightness and liquid - tightness of the connection and prevent any possible leakage risks.

[0040] As Figure 4 and Figure 5 shown, for an LNG storage tank according to the present invention, the types of double - steel - plate concrete units include: corner units 24, the cross - section of the corner units 24 is in a broken - line shape, corresponding to the polygonal corner parts of the outer tank 20; flat units 25, the cross - section of the flat units 25 is in a straight - line shape, spliced between the corner units 24. Specifically, the cross - section of the corner units 24 is in a broken - line shape, designed to correspond to the polygonal corner parts of the outer tank 20. Its unique geometric shape enables precise adaptation to the requirements of the polygonal design of the outer tank 20, thus optimizing the mechanical properties of the entire storage tank. The cross - section of the flat units 25 is in a straight - line shape, mainly used for splicing between the corner units 24 to form the main body part of the outer tank 20. The above - mentioned units preferably have a standardized design, which is convenient for factory prefabrication and on - site assembly, simplifies the construction process, and improves efficiency. The close cooperation between the flat units 25 and the corner units 24 not only enhances the continuity and consistency of the overall structure but also ensures a smooth transition on the surface of the storage tank, reduces the thermal bridge effect, and improves the heat insulation performance.

[0041] As Figure 6 and Figure 7 shown, for an LNG storage tank according to the present invention, the connection structure includes: butt welds, used to directly weld the steel - plate edges of adjacent double - steel - plate concrete units to ensure seamless connection between the two. The connection method by butt welds can provide high mechanical strength and sealing performance, and is particularly suitable for parts that require high strength and high durability, such as the junction of the corner units 24 and the flat units 25.

[0042] On the other hand, in order to further enhance the connection strength and simplify the on-site installation process, in two adjacent double steel plate concrete units, one is preferably provided with connecting steel bars 26 extending towards the other, and the other is correspondingly provided with reserved holes 27 matching the connecting steel bars 26, and an adhesive for bonding the connecting steel bars 26 is coated in the reserved holes 27. Specifically, on one side of one unit, connecting steel bars 26 (preferably of HRB400 type with a diameter of 12 - 18 mm) extending towards the other unit are pre-installed, and the other unit is provided with reserved holes 27 precisely matching these steel bars. The inside of the reserved holes 27 is pre-coated with a special adhesive. When the two units are spliced, the connecting steel bars 26 are inserted into the reserved holes 27 and firmly bonded through the adhesive, which not only ensures the reliability and durability of the connection, but also reduces the on-site welding workload and improves the construction efficiency.

[0043] According to an LNG storage tank of the present invention, a positioning structure is further provided on the double steel plate concrete unit as a temporary positioning device. The positioning structure preferably includes: positioning ear plates 28 symmetrically arranged on the inner and outer sides of the double steel plate concrete unit; positioning bolts 29 for passing through the positioning ear plates 28 of two adjacent double steel plate concrete units and being fixed by nuts 291. The nuts 291, as a supporting structure of the positioning bolts 29, act together on the positioning ear plates 28 of the adjacent units. Among them, the positioning bolts 29 and the nuts 291 can be of M10 - M16 grade.

[0044] Specifically, during the installation process, first, the positioning bolts 29 are passed through the positioning ear plates 28 of two adjacent units, and then tightened and fixed with the nuts 291 to achieve preliminary positioning. This step can provide the necessary stability before the welding or bonding connection is completed, and avoid misalignment caused by external forces. The temporary positioning structure not only improves the splicing accuracy and reduces the workload of subsequent adjustments during the construction process, but also enhances the safety of the construction site and reduces the accident risk. In addition, the use of the positioning bolts 29 and the nuts 291 makes the entire installation process more flexible and controllable, and can ensure efficient operation even under complex on-site conditions. Once the permanent connection (such as butt welds, steel bar connections, etc.) is completed, these temporary positioning devices can be conveniently removed or retained depending on the specific situation.

[0045] The construction method of the LNG storage tank according to the preferred embodiment of the present invention is as follows.

[0046] First, the outer tank 20 and the inner tank 10 of the LNG storage tank are divided into units according to the design drawings. Subsequently, in the factory, according to the divided units, the inner steel plate 21 and the outer steel plate 22 are formed into a hollow frame by welding, and the core concrete 23 is filled inside; in this process, in order to match the polygonal structure of the inner tank 10, the outer tank 20 is further subdivided into corner units 24 and flat plate units 25 for production, and the positioning ear plates 28 are welded at the designated positions of the double-steel plate concrete units. At the same time, the corrugated stainless steel thin layer units are also manufactured in the factory according to the divided units for the subsequent assembly of the inner tank 10.

[0047] After the prefabrication work is completed, the construction of the bottom support structure 30 begins at the construction site. When each unit of the outer tank 20 is transported to the site, it is hoisted according to the principle that the corner units 24 and the flat plate units 25 are adjacent to each other. After filling a certain amount of bonding glue into the cavity of the reserved hole 27 in the double-steel plate concrete unit, the adjacent double-steel plate concrete units with connecting steel bars 26 are inserted into the reserved hole 27 coated with bonding glue to achieve preliminary fixation.

[0048] Next, the positioning bolts 29 are inserted into the positioning ear plates 28 of the adjacent double-steel plate concrete units, and after adjusting the flatness, they are connected and tightened by nuts 291; the same connection operation method is adopted at the same position on the inner and outer sides to ensure the stable connection between the units. To strengthen the overall structure, at the connection part of the corner unit 24 and the flat plate unit 25, the double-steel plate concrete units are formed into a whole by welding, and the vertical welds need to be staggered between the upper and lower layers to ensure the structural strength and stability.

[0049] After the above steps are completed on-site, the construction operation of the concrete dome 42 is immediately carried out to construct a solid protective layer on the top of the storage tank. Inside the outer tank 20, the construction operation of the insulation layer 11 is continued to ensure good heat insulation effect. Finally, the splicing and welding operations of the corrugated stainless steel thin layer units are carried out inside the insulation layer 11 to form the complete structure of the inner tank 10. After the ceiling operation is completed, the overall construction operation of the LNG storage tank is finally realized.

[0050] In the description of this specification, the descriptions referring to terms such as "one embodiment", "some embodiments", "way", "specific way", or "some ways" mean that the specific features, structures, materials, or characteristics described in connection with the embodiment or way are included in at least one embodiment or way of the embodiments of the present invention. In this specification, the schematic expressions of the above terms do not necessarily refer to the same embodiment or way. Moreover, the specific features, structures, materials, or characteristics described can be combined in a suitable manner in any one or more embodiments or ways. In addition, without contradiction, those skilled in the art can combine and combine the different embodiments or ways described in this specification and the features of different embodiments or ways.

[0051] Finally, it should be noted that the above embodiments are only used to illustrate the technical solutions of the present invention and are not intended to limit them; although the present invention has been described in detail with reference to the foregoing embodiments, those of ordinary skill in the art should understand that they can still modify the technical solutions described in the foregoing embodiments, or perform equivalent replacements on some of the technical features; and these modifications or replacements do not cause the essence of the corresponding technical solutions to deviate from the spirit and scope of the technical solutions of the various embodiments of the present invention.

Claims

1. An LNG storage tank, characterized in that, Comprising: A tank body, the tank body comprising an inner tank and an outer tank sleeved outside the inner tank, an insulating layer being provided between the outer side of the inner tank and the inner side of the outer tank, the outer tank having a multi-layer structure, the multi-layer structure comprising an inner steel plate, an outer steel plate, and core-filled concrete filled between the inner steel plate and the outer steel plate; A dome structure, arranged at the top of the inner tank and the outer tank; A bottom support structure, located below the tank body, the top of the bottom support structure being connected to the bottom of the inner tank through the insulating layer, and the bottom of the bottom support structure being connected to a group pile foundation structure fixed to the ground.

2. The LNG storage tank according to claim 1, wherein, The insulating layer is made of polyurethane foam material.

3. The LNG storage tank according to claim 1, characterized in that, The dome structure comprises: An aluminum alloy ceiling, arranged at the top of the inner tank; A concrete dome, arranged above the aluminum alloy ceiling.

4. The LNG storage tank according to claim 1, characterized in that, The cross-sectional shape of the inner tank is polygonal, and the polygonal inner tank is spliced by a plurality of corrugated stainless steel thin-layer units.

5. The LNG storage tank according to claim 4, wherein, The thickness of the corrugated stainless steel thin-layer unit is 1.2 - 2 mm; And / or, the number of sides of the polygon of the cross-section of the inner tank is a multiple of 12.

6. The LNG storage tank according to claim 1, characterized in that, The thickness of the inner steel plate and the outer steel plate is 5 - 10 mm; And / or, the thickness of the core-filled concrete is 400 - 1000 mm.

7. The LNG storage tank according to any one of claims 1 to 6, characterized in that, The outer tank is spliced by a plurality of precast double-steel-plate concrete units; Each of the double-steel-plate concrete units comprises the multi-layer structure, and a corresponding connecting structure is provided between adjacent double-steel-plate concrete units.

8. The LNG storage tank according to claim 7, wherein, The types of the double-steel-plate concrete units include: Corner units, the cross-section of the corner units being zigzag, corresponding to the polygonal corner parts of the outer tank; Flat units, the cross-section of the flat units being linear, spliced between the corner units.

9. The LNG storage tank according to claim 7, wherein The connecting structure comprises: Butt welds; And / or, in two adjacent double-steel-plate concrete units, one is provided with connecting steel bars extending towards the other, and the other is provided with reserved holes matching the connecting steel bars, and an adhesive for bonding the connecting steel bars is coated in the reserved holes.

10. The LNG storage tank according to claim 7, characterized in that, A positioning structure is further provided on the double-steel-plate concrete unit, and the positioning structure comprises: Positioning ear plates, symmetrically arranged on the inner and outer sides of the double-steel-plate concrete unit; Positioning bolts, used to pass through the positioning ear plates of two adjacent double-steel-plate concrete units and fixed by nuts.

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