A type B storage tank for liquefied natural gas storage

Abstract

The present invention discloses a type B storage tank for liquefied natural gas, which comprises a main shielding tank, an insulating layer, a channel, a secondary shielding film, a moisture-proof layer, a concrete outer tank and a concrete bottom plate. An insulating layer is connected to the channel on the outer side of the main shielding tank. The bottom of the inner side of the channel is connected to the secondary shielding film. The inner side of the secondary shielding film is connected to a support plate, and the inner side of the support plate is connected to the insulating layer. The secondary shielding film is installed in partial areas and can be bent to form a liquid accumulation tray mode. The main shielding tank is an independent structure with reinforcing ribs on the inner layer and contains liquefied natural gas. The secondary shielding film is formed by overlapping and welding continuous arched corrugated plates. The present invention realizes a completely independent main shielding layer and a partial secondary shielding film, with a 600-mm nitrogen channel in the middle, thereby reducing the construction workload, shortening the construction period, improving the equipment safety, and realizing the concept of green environmental protection.

Description

Technical Field

[0001] The present invention relates to the technical field of liquefied natural gas (LNG) cryogenic storage devices, and in particular to a B-type storage tank for storing liquefied natural gas. Background Art

[0002] Liquefied natural gas (LNG) has been the preferred energy source to replace oil for its advantages of being green, environmentally friendly and efficient, and has become one of the fastest growing energy industries in the world. With the rapid development of my country's economy and the continuous improvement of environmental governance requirements, the application and development of LNG has received more and more attention from all parties, thus triggering a rapid growth in the demand for clean energy in society. One of the key directions for the development of clean energy in China in the future is LNG.

[0003] The main components of an LNG receiving station are terminal unloading, LNG storage, process processing and external transmission. Among them, the LNG storage tanks that undertake the storage task have the longest construction period, the most advanced technology and the most difficulties in the construction process, and have always been managed as the key path of the entire project.

[0004] At present, the standardization prefabrication degree of 9% nickel steel storage tank is low, and the automatic welding rate is low, which increases the construction difficulty of 9% Ni storage tank. At the same time, the construction process limits the volume of 9% nickel steel storage tank, and the tank bottom uses foam glass bricks to achieve the cold insulation effect, which needs to be laid in 4 layers. The thickness plus the moisture-proof layer must reach 0.6m, resulting in different thicknesses between the tank bottom and the tank wall, which greatly increases the construction period. Therefore, a new technical solution needs to be designed to solve the problem.

[0005] The existing technologies are all monopolized by foreign technology companies, and domestic technology breakthroughs are urgently needed. The existing technology construction process is complicated, and the secondary shield welding workload is large. Therefore, it is necessary to design corresponding technical solutions to solve the existing technical problems. Summary of the invention

[0006] The object of the present invention is to provide a type B storage tank for liquefied natural gas storage, which solves the problems in the prior art that the existing protective device construction process is complicated, the dependence on the original storage tank form is relatively high, the production and manufacturing cost of the film is relatively high and the supply is extremely limited, the workload on site of the prior art is large, and its shielding system structure is relatively complex and the installation process requirements are relatively high.

[0007] To achieve the above-mentioned object, the present invention provides the following technical scheme: a type B storage tank for storing liquefied natural gas, comprising a concrete bottom plate, a moisture-proof layer, a dome, and a main shielding tank, wherein the type B storage tank is provided with a concrete bottom plate, a moisture-proof layer, an epoxy resin adhesive layer, a first support plate, a first insulating plate, a second support plate, a second insulating plate, a third support plate, a secondary shielding film, a nitrogen air chamber, a third insulating plate, a composite material layer, a fourth insulating plate, a fourth support plate and a main shielding tank from the outside to the inside, wherein the first support plate, the first insulating plate, the second support plate, the second insulating plate, the third support plate, the secondary shielding film, the nitrogen air chamber, the third insulating plate, the composite material layer, the fourth insulating plate, the fourth support plate and the main shielding tank, wherein the first support plate, the first insulating plate, the second support plate, the second insulating plate The board, the third support board, and the secondary shielding film are bonded to each other to prefabricate a standard insulation module to form the entire secondary insulation layer. The secondary insulation layer has several groups of studs built in and is fixed to the concrete base plate through the studs and the epoxy resin adhesive layer. The periphery of several groups of the studs is filled with filling insulation blocks. The secondary insulation layer is composed of a plurality of standard module insulation modules spliced ​​together. The periphery of the module at the gap between two adjacent insulation boards is also filled with filling insulation blocks. The inner side of the third support board is bonded to the secondary shielding film and several groups of strip steel plates are pre-buried at the connection. The thickness of the strip steel plates is 3mm-15mm. The material used is stainless steel plate, 9% nickel steel plate, Invar steel plate or aluminum alloy plate. The boundary corners of the second insulating plate are provided with L-shaped corner bodies and T-shaped corner bodies, with an angle range of 90 degrees to 135 degrees. The L-shaped corner bodies and T-shaped corner bodies are respectively used for connecting the corners of the secondary shielding membrane. The secondary shielding membrane is installed in a partial area and can be bent to form a liquid accumulation tray mode; the nitrogen air cabin is a space reserved for inspection and maintenance between the main shielding tank and the secondary shielding membrane, which will be filled with nitrogen during operation. The main shielding tank is an independent structure welded from steel plates, and the inner layer has horizontal and vertical The staggered reinforcing ribs are connected to the concrete base plate via a fixing device, wherein the fixing device is composed of an upper support block, a lower support block and an insulation block; the outer side of the main shielding tank is connected to a main insulation layer composed of a fourth support plate, a fourth insulation plate, a composite material layer and a third insulation plate, wherein the main insulation layer has several groups of studs built in and is fixed to the main shielding tank via studs and an epoxy resin adhesive layer, wherein the peripheries of several groups of the studs are filled with filling insulation blocks, and the secondary insulation layer is composed of a plurality of standard module insulation modules spliced ​​together, and the peripheries of the modules at the gaps between two adjacent insulation plates are also filled with filling insulation blocks.

[0008] As a preferred embodiment of the present invention, the first support plate and the first insulating plate are laid on the moisture-proof layer and the concrete bottom plate and fixed by studs and an epoxy resin adhesive layer; the outer side of the main shielding tank is connected to a main insulating layer composed of a fourth support plate, a fourth insulating plate, a composite material layer and a third insulating plate, the main insulating layer has several groups of studs built in and is fixed to the main shielding tank by studs and an epoxy resin adhesive layer, and the epoxy resin adhesive layer is formed by mixing a special material and an adhesive.

[0009] As a preferred embodiment of the present invention, the first plywood and the first foamed insulation board are laid on the moisture-proof layer and the concrete outer tank and fixed by studs and an epoxy resin adhesive layer, wherein the epoxy resin adhesive layer is formed by mixing a high molecular polymer and a curing agent.

[0010] As a preferred embodiment of the present invention, the secondary shielding membrane is composed of a composite material with an aluminum foil in the middle and a layer of glass fiber pasted on the inside and outside, or is a stainless steel plate, 9% nickel steel plate, Invar steel plate or aluminum alloy steel plate with a thickness of 0.8mm-3.0mm, and the shape is a continuous arched corrugated convex structure.

[0011] As a preferred embodiment of the present invention, the composite material layer is composed of a composite material with an aluminum foil in the middle and a layer of glass fiber pasted on the inner and outer sides.

[0012] As a preferred embodiment of the present invention, the materials of the first support plate, the second support plate, the third support plate and the fourth support plate are all wood plywood, fiberglass, tetrafluoroethylene (PFA), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK) materials, and their thicknesses are 2mm-30mm, which serves to increase the strength of the insulation board.

[0013] As a preferred embodiment of the present invention, the L-shaped corner body and T-shaped corner body adopt L-shaped and T-shaped insulating plates and are fixed at the corner of the second insulating plate. The L-shaped corner body and T-shaped corner body are made of stainless steel, 9% nickel steel plate, Invar steel or aluminum alloy.

[0014] As a preferred embodiment of the present invention, the first insulating board, the second insulating board, the third insulating board and the fourth insulating board are all made of reinforced polyurethane foam material and glass fiber material with a density of 20-300 kg / m 3 , the thickness of the first insulating plate is 50mm-500mm, the thickness of the second insulating plate is 50mm-500mm, the thickness of the third insulating plate is 50mm-500mm and the thickness of the fourth insulating plate is 50mm-500mm.

[0015] As a preferred embodiment of the present invention, the material of the first insulating board, the second insulating board, the third insulating board and the fourth insulating board is glass fiber reinforced polyurethane foam, the strength of the foamed insulating board is increased by adding glass fiber inside, and the reinforced polyurethane foam is formed by mixing and heating a variety of chemical material formulas, which can play a good thermal insulation effect. The first insulating board, the second insulating board, the third insulating board and the fourth insulating board are all composed of a plurality of standard module insulating boards spliced ​​together, and the gap between two adjacent foamed insulating boards and the periphery of the studs are also filled with filling insulation blocks. The filling insulation blocks are made of flexible insulation or rigid insulation or glass fiber insulation materials, so as to enhance the insulation effect and reduce heat transfer inside and outside the cargo hold.

[0016] As a preferred embodiment of the present invention, the main shielding tank is made of stainless steel, nickel steel or aluminum alloy plate.

[0017] As a preferred embodiment of the present invention, the connecting device between the main shielding tank and the concrete bottom plate is composed of an upper support block, a lower support block and a middle insulation block, the upper support block is welded to the bottom, side and top of the main shielding tank, the lower support blocks are respectively welded to the concrete bottom plate, and an insulation block is installed between the upper support block and the lower support block.

[0018] Compared with the prior art, the present invention has the following beneficial effects:

[0019] The protective device of the present invention is composed of a completely enclosed main shielding tank and a part of the secondary shielding membrane. The main shielding tank can bear the sloshing and impact capabilities during continuous loading.

[0020] The design of the present invention adopts a complete main shielding tank and a partial secondary shielding, and the insulating materials are insulating plates and glass fibers, which improves the overall strength and increases the reliability and safety of the tank body.

[0021] The secondary shielding membrane of the present invention adopts a high-strength composite material or corrugated steel plate, which can absorb the deformation of the membrane due to thermal expansion and contraction in the longitudinal and transverse directions. The continuous arched corrugation increases the ductility of the film plate. The design is simpler than the existing technology and reduces the cost. The continuous arched corrugation design can select the specific plate thickness and size according to calculation and experiment, which is more flexible.

[0022] The patented invention can be supplied in modular form, and most of the prefabrication work can be done before the tank body is closed, thereby reducing the construction period.

[0023] The B-type storage tank of the present invention is a fully enclosed form, and has higher structural stability and better protection performance. BRIEF DESCRIPTION OF THE DRAWINGS

[0024] Figure 1 It is a schematic diagram of the structure of the components of the B-type storage tank of the present invention;

[0025] Figure 2 It is a structural diagram of the secondary shielding film of the present invention;

[0026] Figure 3 It is a partial structural diagram of the secondary shielding film of the present invention;

[0027] Figure 4 is a schematic cross-sectional view of the secondary shielding film of the present invention;

[0028] Figure 5 It is a schematic diagram of the composition of the B-type storage tank of the present invention;

[0029] Figure 6 It is a schematic diagram of the T-shaped corner body of the present invention.

[0030] In the figure: 1. concrete outer tank; 2. epoxy resin adhesive layer; 3. first plywood; 4. first foam insulation board; 5. second plywood; 6. second foam insulation board; 7. third plywood; 8. secondary shielding membrane; 9. nitrogen air chamber; 10. third insulation board; 11. composite material layer; 12. fourth insulation board; 13. fourth support board; 14. main shielding tank; 15. bolts; 16. L-shaped corner body; 17. concrete bottom plate; 18. moisture-proof layer; 19. dome; 20. filling insulation block; 21. upper support block; 22. lower support block; 23. insulation block; 26. T-shaped corner body. DETAILED DESCRIPTION

[0031] The following will be combined with the drawings in the embodiments of the present invention to clearly and completely describe the technical solutions in the embodiments of the present invention. Obviously, the described embodiments are only part of the embodiments of the present invention, not all of the embodiments. Based on the embodiments of the present invention, all other embodiments obtained by ordinary technicians in this field without creative work are within the scope of protection of the present invention.

[0032] See also Figure 1-Figure 5The present invention provides a technical solution: a type B storage tank for storing liquefied natural gas, comprising a concrete bottom plate 17, a moisture-proof layer 18, a dome 19, and a main shielding tank 15. The type B storage tank is provided with a concrete bottom plate 17, a moisture-proof layer 18, an epoxy resin adhesive layer 2, a first support plate 3, a first insulating plate 4, a second support plate 5, a second insulating plate 6, a third support plate 7, a secondary shielding film 8, a nitrogen air cabin 9, a third insulating plate 10, a composite material layer 11, a fourth insulating plate 12, a fourth support plate 13 and a main shielding tank 14 from the outside to the inside. The first support plate 3, the first insulating plate 4, the second support plate 5, The second insulating plate 6, the third supporting plate 7, and the secondary shielding film 8 are bonded to each other to form a standard insulating module to form the entire secondary insulating layer. The secondary insulating layer has several groups of studs 15 built in and is fixed to the concrete base plate 17 through the studs 15 and the epoxy resin adhesive layer 2. The periphery of several groups of the studs 15 is filled with filling insulating blocks 20. The secondary insulating layer is composed of a plurality of standard module insulating modules. The periphery of the module at the gap between two adjacent insulating plates is also filled with filling insulating blocks 20. The inner side of the third supporting plate 7 is bonded to the secondary shielding film 8 and several groups of strip steel plates are pre-buried at the connection. The thickness of the strip steel plates is 3mm-15mm. The material used is stainless steel plate, 9% nickel steel plate, Invar steel plate or aluminum alloy plate. The boundary corners of the second insulating plate 6 are provided with L-shaped corner bodies 16 and T-shaped corner bodies 26, with an angle range of 90-135 degrees. The L-shaped corner bodies 16 and T-shaped corner bodies 26 are respectively used for connecting the corners of the secondary shielding membrane 8. The secondary shielding membrane 8 is installed in a partial area and can be bent to form a liquid accumulation tray mode; the nitrogen air cabin 9 is a space reserved for inspection and maintenance between the main shielding tank 14 and the secondary shielding membrane 8, which will be filled with nitrogen during operation. The main shielding tank 14 is an independent structure welded from steel plates, and the inner layer has horizontal and vertical crisscross reinforcement ribs. , connected to the concrete bottom plate through a fixing device, the fixing device is composed of an upper support block 21, a lower support block 22 and an insulation block 23; the outer side of the main shielding tank 14 is connected to a main insulation layer composed of a fourth support plate 13, a fourth insulation plate 12, a composite material layer 11 and a third insulation plate 10, the main insulation layer has several groups of studs 15 built in and is fixed to the main shielding tank 14 through the studs 15 and the epoxy resin adhesive layer 2, the periphery of several groups of the studs 15 is filled with filling insulation blocks 20, the secondary insulation layer is composed of a plurality of standard module insulation modules spliced ​​together, and the periphery of the module at the gap between two adjacent insulation plates is also filled with filling insulation blocks 20.

[0033] Further improvement, such as Figure 1As shown: the first support plate 3 and the first insulating plate 4 are laid on the moisture-proof layer 18 and the concrete bottom plate 17 and fixed by studs 15 and the epoxy resin adhesive layer 2; the outer side of the main shielding tank 14 is connected to the main insulating layer composed of the fourth support plate 13, the fourth insulating plate 12, the composite material layer 11 and the third insulating plate 10, and the main insulating layer has several groups of studs 15 built in and is fixed to the main shielding tank 14 by the studs 15 and the epoxy resin adhesive layer 2, and the epoxy resin adhesive layer 2 is made of a mixture of a high molecular polymer and a curing agent.

[0034] Further improvement, such as Figure 1 As shown: the secondary shielding membrane 8 is composed of a composite material with an aluminum foil in the middle and a layer of glass fiber pasted on the inside and outside, or a stainless steel plate, 9% nickel steel plate, Invar steel plate or aluminum alloy steel plate with a thickness of 0.8mm-3.0mm, and the shape is a continuous arched corrugated convex structure.

[0035] Further improvement, such as Figure 1 As shown: the composite material layer 11 is composed of a composite material with an aluminum foil in the middle and a layer of glass fiber pasted on the inner and outer sides.

[0036] Further improvement, such as Figure 1 As shown: the materials of the first support plate 3, the second support plate 5, the third support plate 7 and the fourth support plate 13 are all wood plywood, fiberglass, tetrafluoroethylene (PFA), polytetrafluoroethylene (PTFE), polyetheretherketone (PEEK) materials, and their thicknesses are 2mm-30mm, which serve to increase the strength of the insulation board.

[0037] Further improvement, such as Figure 1 As shown: the L-shaped corner body 16 and the T-shaped corner body 26 adopt L-shaped and T-shaped insulating plates and are fixed at the corners of the second insulating plate 6. The L-shaped corner body 16 and the T-shaped corner body 26 are made of stainless steel, 9% nickel steel plate, Invar steel or aluminum alloy.

[0038] Further improvement, such as Figure 1 As shown: the first insulating board 4, the second insulating board 6, the third insulating board 10, and the fourth insulating board 12 are all made of reinforced polyurethane foam material and glass fiber material with a density of 20-300kg / m3, the thickness of the first insulating board 4 is 50mm-500mm, the thickness of the second insulating board 6 is 50mm-500mm, the thickness of the third insulating board 10 is 50mm-500mm, and the thickness of the fourth insulating board 12 is 50mm-500mm.

[0039] Further improvement, such as Figure 1As shown: the material of the first insulating board 4, the second insulating board 6, the third insulating board 10 and the fourth insulating board 12 is glass fiber reinforced polyurethane foam, and the strength of the foamed insulating board is increased by adding glass fiber inside. The reinforced polyurethane foam is formed by mixing and heating a variety of chemical material formulas, which can play a good role in thermal insulation. The first insulating board 4, the second insulating board 6, the third insulating board 10 and the fourth insulating board 12 are all composed of a plurality of standard module insulating boards. The gap between two adjacent foamed insulating boards and the periphery of the stud 15 are also filled with filling insulation blocks 20. The filling insulation blocks 20 are made of flexible insulation or rigid insulation or glass fiber insulation materials, so as to enhance the insulation effect and reduce heat transfer inside and outside the cargo hold.

[0040] Further improvement, such as Figure 1 As shown, the main shielding tank 14 is made of stainless steel or 9% nickel steel or aluminum alloy plate.

[0041] Further improvement, such as Figure 1 As shown, the connecting device between the main shielding tank 14 and the concrete bottom plate 17 is composed of an upper support block 21, a lower support block 22 and a middle heat insulation block 23. The upper support block 21 is welded to the bottom, side and top of the main shielding tank 14, and the lower support block 22 is welded to the concrete bottom plate 17 respectively. A heat insulation block is installed between the upper support block and the lower support block.

[0042] The secondary shielding membrane 8 designed by the present invention is composed of a composite material with a layer of glass fiber pasted on the inner and outer sides of aluminum foil in the middle, or a continuous arched corrugation is adopted to increase the ductility of the film plate. The design is simpler than the existing technology and reduces the cost. The continuous arched corrugation design can select the specific plate thickness and size based on calculation and experiment, which is more flexible. The continuous arched corrugation increases the area of ​​a single plate and reduces the workload of cargo hold welding. Fillers are installed on the inside of the corrugated plate, there is no loading limit, and the film is not easily damaged.

[0043] Finally, it should be noted that the above description is only a preferred embodiment of the present invention and is not intended to limit the present invention. Although the present invention has been described in detail with reference to the aforementioned embodiments, those skilled in the art can still modify the technical solutions described in the aforementioned embodiments or replace some of the technical features therein by equivalents. Any modification, equivalent replacement, improvement, etc. made within the spirit and principle of the present invention shall be included in the protection scope of the present invention.

Claims

1. A type B storage tank for liquefied natural gas storage, Features: The B-type storage tank comprises a concrete bottom plate (17), a moisture-proof layer (18), a dome (19), and a main shielding tank (14). The B-type storage tank is provided with a concrete bottom plate (17), a moisture-proof layer (18), an epoxy resin adhesive layer (2), a first support plate (3), a first insulating plate (4), a second support plate (5), a second insulating plate (6), a third support plate (7), a secondary shielding membrane (8), a nitrogen air chamber (9), a third insulating plate (10), a composite material layer (11), a fourth insulating plate (12), a fourth support plate (13) and a main shielding tank (14) from the outside to the inside. The first support plate (3), the first insulating plate (4), the second support plate (5), the second insulating plate (6), The third support plate (7) and the secondary shielding film (8) are bonded to each other to form a standard insulation module to form the entire secondary insulation layer. The secondary insulation layer has a plurality of groups of studs (15) built in and is fixed to the concrete base plate (17) through the studs (15) and the epoxy resin adhesive layer (2). The periphery of the plurality of groups of the studs (15) is filled with filling insulation blocks (20). The secondary insulation layer is composed of a plurality of standard module insulation modules spliced ​​together. The periphery of the modules at the gap between two adjacent insulation plates is also filled with filling insulation blocks (20). The inner side of the third support plate (7) is bonded to the secondary shielding film (8) and a plurality of groups of strip steel plates are pre-buried at the connection. The thickness of the strip steel plates is 3 mm-15 mm and the material used is stainless steel. Steel plate, 9% nickel steel plate, Invar steel plate or aluminum alloy plate, the boundary corners of the second insulating plate (6) are provided with L-shaped corner bodies (16) and T-shaped corner bodies (26), the angle range is 90 degrees-135 degrees, the L-shaped corner bodies (16) and T-shaped corner bodies (26) are respectively used for connecting the corners of the secondary shielding membrane (8), the secondary shielding membrane (8) is installed in a partial area and can be bent to form a liquid accumulation tray mode; the nitrogen air cabin (9) is a space reserved for inspection and maintenance between the main shielding tank (14) and the secondary shielding membrane (8), which will be filled with nitrogen during operation, the main shielding tank (14) is an independent structure welded from steel plates, the inner layer has reinforcing ribs that are staggered horizontally and vertically, and is fixed by a fixing device and a mixing The main shielding tank (14) is connected to a concrete bottom plate, the fixing device is composed of an upper support block (21), a lower support block (22) and an insulation block (23); the outer side of the main shielding tank (14) is connected to a main insulation layer composed of a fourth support plate (13), a fourth insulation plate (12), a composite material layer (11) and a third insulation plate (10); the main insulation layer has a plurality of groups of studs (15) built in and is fixed to the main shielding tank (14) through the studs (15) and an epoxy resin adhesive layer (2); the peripheries of the plurality of groups of studs (15) are filled with filling insulation blocks (20); the secondary insulation layer is composed of a plurality of standard module insulation modules spliced ​​together, and the peripheries of the modules at the gaps between two adjacent insulation plates are also filled with filling insulation blocks (20); The composite material layer (11) is composed of a composite material with an aluminum foil in the middle and a layer of glass fiber pasted on the inner and outer sides; The material of the main shielding tank (14) is stainless steel, 9% nickel steel, or aluminum alloy plate.

2. A type B storage tank for liquefied natural gas according to claim 1, wherein: The first support plate (3) and the first insulating plate (4) are laid on the moisture-proof layer (18) and the concrete bottom plate (17) and fixed by studs (15) and epoxy resin adhesive layers (2); the outer side of the main shielding tank (14) is connected to a main insulating layer composed of a fourth support plate (13), a fourth insulating plate (12), a composite material layer (11), and a third insulating plate (10). A number of groups of studs (15) are built into the main insulating layer and fixed to the main shielding tank (14) by studs (15) and epoxy resin adhesive layers (2).

3. A type B storage tank for liquefied natural gas according to claim 1, wherein: The secondary shielding film (8) is composed of a composite material with aluminum foil in the middle and a layer of glass fiber pasted on each of the inner and outer sides, or is made of a stainless steel plate, 9% nickel steel plate, Invar steel plate, or aluminum alloy steel plate with a thickness of 0.8 mm - 3.0 mm and has a continuous arched corrugated convex structure.

4. A type B storage tank for liquefied natural gas according to claim 1, wherein: The materials of the first support plate (3), the second support plate (5), the third support plate (7), and the fourth support plate (13) are all wood plywood, fiberglass, polytetrafluoroethylene, PTFE, or polyether ether ketone materials, and their thicknesses are all 2 mm - 30 mm.

5. A type B storage tank for liquefied natural gas according to claim 1, wherein: The L-shaped corner body (16) and the T-shaped corner body (26) adopt L-shaped and T-shaped insulating plates and are fixed at the corners of the second insulating plate (6). The materials of the L-shaped corner body (16) and the T-shaped corner body (26) are stainless steel, 9% nickel steel plate, Invar steel, or aluminum alloy.

6. A type B storage tank for liquefied natural gas according to claim 1, wherein: The first insulating plate (4), the second insulating plate (6), the third insulating plate (10), and the fourth insulating plate (12) all adopt reinforced polyurethane foam material and glass fiber material, with a density of 20 - 300 kg / m3. The thickness of the first insulating plate (4) is 50 mm - 500 mm, the thickness of the second insulating plate (6) is 50 mm - 500 mm, the thickness of the third insulating plate (10) is 50 mm - 500 mm, and the thickness of the fourth insulating plate (12) is 50 mm - 500 mm.

7. A type B storage tank for liquefied natural gas according to claim 1, wherein: The materials of the first insulating plate (4), the second insulating plate (6), the third insulating plate (10) and the fourth insulating plate (12) are glass fiber reinforced polyurethane foam. Glass fibers are added inside to increase the strength of the foamed insulating plate. The reinforced polyurethane foam is formed by mixing and heating with a variety of chemical material formulations, which can achieve a good heat insulation effect. The first insulating plate (4), the second insulating plate (6), the third insulating plate (10) and the fourth insulating plate (12) are all composed of multiple standard modular insulating plates spliced together. Filling insulating blocks (20) are also stuffed at the gaps between adjacent two foamed insulating plates and around the studs (15). The filling insulating blocks (20) are made of flexible insulation or rigid insulation or glass fiber insulation materials.

8. A type B storage tank for liquefied natural gas storage according to claim 1, characterized in that: The connecting device between the main shielding tank (14) and the concrete bottom plate (17) is composed of an upper support block (21), a lower support block (22) and an intermediate heat insulation block (23). The upper support block (21) is welded to the bottom, side and top of the main shielding tank (14). The lower support block (22) is welded to the concrete bottom plate (17) respectively, and a heat insulation block is installed between the upper support block and the lower support block.

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