JP2023122758A - Low temperature liquefied gas tank and construction method of the same - Google Patents

Abstract

To provide a low temperature liquefied gas tank including a vacuum heat insulation structure which is excellent in processability and ease of assembly of outer tank panels and may be applied to achieve high capacity, and to provide a construction method of the low temperature liquefied gas tank.SOLUTION: A low temperature liquefied gas tank 1 includes: an inner tank 12 in which a low temperature liquefied gas LG is stored; an outer tank 11 formed by an assembly of multiple outer tank panels 2 and enclosing the inner tank 12; and a vacuum heat insulation layer 13 between the inner tank 12 and the outer tank 11. The outer tank panels 2 include: an inner panel 21 and an outer panel 22 which face each other while forming a predetermined space therebetween; and a honeycomb structure 23 disposed between the inner panel 21 and the outer panel 22. The honeycomb structure 23 is formed by an aggregate of multiple honeycomb hollow columns 24 arranged in a honeycomb form.SELECTED DRAWING: Figure 1

Description

The present disclosure relates to a cryogenic liquefied gas tank for storing cryogenic liquefied gas and a construction method thereof.

A multi-shell tank is known as a facility for storing low-temperature liquefied gas. A multi-shell tank generally includes an inner tank for storing cryogenic liquefied gas, an outer tank surrounding the inner tank, and a heat insulating layer between the inner tank and the outer tank. From the viewpoint of reducing the evaporation rate (BOR value) of the stored low-temperature liquefied gas, it is desirable that the heat insulating layer has a vacuum heat insulating structure (for example, Patent Document 1).

JP 2020-104884 A

When adopting a vacuum insulation structure, it is necessary to increase the plate thickness of the outer tank so as to withstand the external vacuum pressure. When constructing a tank with a large capacity, it is necessary to increase the thickness of the outer tank. The outer tank is assembled by welding a plurality of steel panels with spherical surfaces. However, if the steel plate panel is excessively thickened, spherical processing and welding become difficult.

An object of the present disclosure is to provide a low-temperature liquefied gas tank having excellent workability and assembling properties of the outer tank panel, and having a vacuum insulation structure that can be adapted to increase in capacity, and a method of constructing the same.

A cryogenic liquefied gas tank according to one aspect of the present disclosure includes an inner tank for storing cryogenic liquefied gas, an assembly of a plurality of panels, an outer tank surrounding the inner tank, and a space between the inner tank and the outer tank. the panel includes an inner plate and an outer plate facing each other at a predetermined interval, and a plurality of tubular bodies disposed between the inner plate and the outer plate .

A method for constructing a cryogenic liquefied gas tank according to another aspect of the present disclosure includes an inner tank for storing cryogenic liquefied gas, an outer tank surrounding the inner tank, a vacuum layer between the inner tank and the outer tank, A method for constructing a low-temperature liquefied gas tank comprising: preparing a cylindrical body having a first open end on one end side and a second open end on the other end side; A plurality of panel intermediate bodies are produced by fixing the first opening ends of the plurality of cylindrical bodies to an inner plate made of The outer tank is produced by assembling the panel intermediate body of No. and fixing a lid piece to each of the second open ends of the cylindrical body.

According to the present disclosure, it is possible to provide a low-temperature liquefied gas tank having excellent workability and assembling properties of the outer tank panel and having a vacuum insulation structure suitable for increasing the capacity, and a method for constructing the same.

1 is a cross-sectional view of a cryogenic liquefied gas tank according to one embodiment of the present disclosure; FIG. FIG. 2 is an exploded perspective view of an outer tank panel that constitutes the outer tank of the low-temperature liquefied gas tank. FIG. 3 is a perspective view of the outer tub panel. FIG. 4 is a perspective view showing a honeycomb hollow column, an inner plate and a hexagonal lid piece that constitute the outer tank panel. FIG. 5 is a plan view of a honeycomb structure constituting the outer tank panel. FIG. 6 is a schematic diagram for explaining an example of a method for constructing a cryogenic liquefied gas tank according to the present disclosure.

Hereinafter, embodiments of a cryogenic liquefied gas tank and a construction method thereof according to the present disclosure will be described in detail with reference to the drawings. The cryogenic liquefied gas tank of the present disclosure is a tank that stores cryogenic liquefied gas and has a multi-shell structure. In the embodiments shown below, a spherical double shell tank is exemplified. The present disclosure is not limited to tank configurations, but is also applicable to triple-hulled tanks and flat-bottom multi-hulled tanks. The stored liquefied gas is a cryogenic liquefied gas such as, for example, liquefied hydrogen, liquid helium, liquid nitrogen, liquefied natural gas or liquefied petroleum gas. In particular, the cryogenic liquefied gas tank according to the present disclosure is suitable for storing liquefied hydrogen.

[Tank structure]
FIG. 1 is a cross-sectional view showing a cryogenic liquefied gas tank 1 according to a first embodiment of the present disclosure. The cryogenic liquefied gas tank 1 is a multi-shell tank that stores cryogenic liquefied gas LG. The cryogenic liquefied gas tank 1 includes a tank body 10 having a spherical double-shell structure, and struts 14 supporting the tank body 10 at a position higher than the tank base GL.

The tank main body 10 is a tank having a storage space 1A for storing the low-temperature liquefied gas LG. and a vacuum heat insulating layer 13 (vacuum layer) disposed between. The outer tank 11 is supported by supports 14 near its equator. The inner tub 12 is supported by the outer tub 11 via hanger rods 15 . Specifically, a hanger rod 15 having one end fixed to the outer tub 11 has its other end fixed to the inner tub 12 , whereby the inner tub 12 is suspended and supported by the outer tub 11 .

The outer tank 11 is a sealed body made of metal such as carbon steel. The outer tank 11 is composed of an assembly of a plurality of outer tank panels 2 assembled by butt welding or the like so as to surround the inner tank 12 . In FIG. 1, some of the plurality of outer tub panels 2 are illustrated. Each outer tank panel 2 is bent to have a spherical surface in order to constitute a part of the spherical outer tank 11 . As will be described in detail later, the outer tank 11 of this embodiment includes an inner plate 21 and an outer plate 22 facing each other at a predetermined interval, and a plurality of inner plates 21 and 22 disposed between the inner plate 21 and the outer plate 22. and a tubular body.

The inner tank 12 is a tank that actually stores the low-temperature liquefied gas LG, and is a closed body made of metal such as a stainless steel plate. The inner tub 12 also consists of an assembly of multiple panels. The inner tank 12 is surrounded by the outer tank 11 with a predetermined space serving as a vacuum insulation layer 13 . The inner tank 12 has a storage space 1A in which the low-temperature liquefied gas LG is stored. Gas vaporized from the low-temperature liquefied gas LG is stored in the upper layer of the storage space 1A.

The vacuum heat insulating layer 13 is a layer for enhancing the cold insulating property of the inner tank 12 by using the gap between the outer tank 11 and the inner tank 12 as a vacuum heat insulating space. By forming a vacuum insulation space around the inner tank 12, even if the low-temperature liquefied gas LG stored in the inner tank 12 is liquefied hydrogen gas, it is possible to suppress the BOR value to a predetermined low rate. . The vacuum insulation layer 13 may contain powder insulation or solid insulation. For example, the vacuum heat insulating layer 13 may be filled with a heat insulating material such as granular perlite or glass wool.

The strut 14 is a metal pillar erected vertically from the tank foundation GL. The tank foundation GL is a concrete layer placed at least at the erected positions of the pillars 14 . A plurality of struts 14 are erected so as to surround the tank body 10 at a predetermined pitch in the circumferential direction. It is desirable to connect adjacent struts 14 with braces to reinforce strength. Note that the tank body 10 may be supported by a skirt structure instead of the struts 14 .

As described above, the low-temperature liquefied gas tank 1 of the present embodiment is a vacuum insulation type tank having the vacuum insulation layer 13 . As another tank type, there is a normal pressure adiabatic type tank. In the normal pressure insulation tank, the heat insulation space of the multi-shell tank structure is kept at normal pressure, and the heat insulation space is filled with a heat insulation material for cold storage, and has a boiling point equal to or lower than that of the stored low temperature liquefied gas LG. Gas is enclosed. When the low-temperature liquefied gas LG to be stored is liquefied natural gas or the like, it is possible to suppress the BOR value to a low rate in the above-described normal-pressure adiabatic tank. This is the same for large tanks with a tank capacity exceeding 10,000 ^m3 .

On the other hand, when the stored low-temperature liquefied gas LG is liquefied hydrogen gas that needs to be stored at minus 253° C., the situation is different. In the case of storing liquefied hydrogen gas, in order to obtain a low BOR value, a tank with high insulation specifications, that is, the low-temperature liquefied gas tank 1 of the above vacuum insulation type is required. In the vacuum insulated tank, the space between the outer tank 11 and the inner tank 12 is evacuated, so the external vacuum pressure is applied to the outer tank 11 which is in contact with the atmospheric pressure. Therefore, the outer tank 11 must have a plate thickness that can withstand the external vacuum pressure.

The required plate thickness of the outer tank 11 increases as the tank capacity increases. If the vacuum insulation tank is a small tank with a small tank capacity, the required plate thickness of the outer tank 11 can be set to a size that can be manufactured relatively easily. However, a large tank with a large tank capacity is more difficult to manufacture. Specifically, in the outer tank panel 2 constituting the outer tank 11, it is difficult to bend the outer tank panel 2 to have a spherical surface because the required plate thickness is too thick, and it is difficult to butt weld the outer tank panels 2 together. A problem arises. In view of such problems, the cryogenic liquefied gas tank 1 of the present embodiment employs a vacuum insulation system, but the outer tank panel 2 is devised so as to be able to cope with an increase in tank capacity. The outer tank panel 2 of this embodiment will be described in detail below.

[Outer tank panel structure]
2 is an exploded perspective view of the outer tank panel 2 constituting the outer tank 11 of the low-temperature liquefied gas tank 1, and FIG. 3 is a perspective view of the outer tank panel 2 in an assembled state. The outer tank panel 2 includes an inner plate 21 and an outer plate 22 facing each other with a predetermined interval, and a honeycomb structure 23 disposed between the inner plate 21 and the outer plate 22 .

The honeycomb structure 23 is composed of an assembly of honeycomb hollow columns 24 . That is, the outer tank panel 2 has a honeycomb sandwich structure in which a plurality of honeycomb hollow columns 24 arranged in honeycomb are sandwiched between the inner plate 21 and the outer plate 22 . The honeycomb hollow pillars 24 are prismatic bodies having a regular hexagonal cross section, and the honeycomb structure 23 is formed by arranging a plurality of honeycomb hollow pillars 24 in a honeycomb shape without gaps. The inner plate 21, the outer plate 22 and the honeycomb hollow column 24 can be made of a highly rigid metal such as carbon steel.

The honeycomb hollow pillar 24 has a first open end 241 on one end side that is fixed to the inner plate 21 and a second open end 242 on the other end side that is fixed to the outer plate 22 . The inner plate 21 is formed of a flat plate material to which the first open ends 241 of the plurality of honeycomb hollow columns 24 can be fixed by welding or the like. The inner plate 21 is bent so as to have a spherical surface along the inner diameter of the outer tank 11 . The outer plate 22 may be composed of a single plate similarly to the inner plate 21. Alternatively, as will be described later with reference to FIGS. It is good also as a mode which fixes a piece.

The honeycomb structure 23 is not limited to the honeycomb hollow column 24 having a regular hexagonal cross section, and may be a cylindrical body having another shape. However, it is desirable that the tubular body is a square tubular body, and that the square tubular bodies have a shape in which a plurality of square tubular bodies can be arranged without gaps. For example, the honeycomb structure 23 may be formed by densely arranging a plurality of prismatic bodies each having a square cross section, a hexagonal cross section, or a triangular cross section. In this case, the side surfaces of the adjacent rectangular tubes are arranged in contact with each other, and the honeycomb structure 23 in which a plurality of rectangular tubes are arranged at high density can be realized. Alternatively, the honeycomb structure 23 may be formed by arranging a plurality of cylindrical bodies as densely as possible. Among these, the outer tank panel 2, in which a honeycomb structure 23 in which honeycomb hollow columns 24 having a regular hexagonal cross section are arranged in a honeycomb manner, is sandwiched between an inner plate 21 and an outer plate 22 is the most rigid and can be used as a tank. It is preferable because it is easy to cope with an increase in capacity.

[Manufacturing example of outer tank panel]
Next, a preferable manufacturing example of the outer tub panel 2 will be described with reference to FIGS. 4 and 5. FIG. Here, an example in which the outer plate 22 is formed by a set of hexagonal lid pieces 25 (lid pieces) individually fixed to the second open ends 242 of the honeycomb hollow columns 24 is shown. FIG. 4 is a diagram showing the manufacturing process of the outer tank panel 2, and is a perspective view showing the honeycomb hollow column 24, the inner plate 21 and the hexagonal lid piece 25. FIG. FIG. 5 is a plan view of the outer tub panel 2 viewed from the outer plate 22 side.

First, a plurality of honeycomb hollow columns 24 are fixed to the inner plate 21 in a honeycomb arrangement. The inner plate 21 is bent in advance so as to have the shape of a spherical piece of a predetermined size forming part of the outer tank 11 . Since the size of the outer tank panel 2 is smaller than the size of the tank main body 10, the bending process for one inner plate 21 is a bending process with a small curvature. The first open end 241 of the honeycomb hollow column 24 is fixed to the inner plate 21 by welding.

One honeycomb hollow column 24 is formed by combining a pair of half pieces 24A. One half piece 24A has three sides of the honeycomb hollow column 24 having six sides. It is desirable that the upper and lower ends of the half pieces 24A are grooved for welding. To give an example of assembly, first, one half piece 24A is erected on the inner plate 21 and the lower end of the half piece 24A is welded to the inner plate 21 . In FIG. 4, the welded portion is illustrated as welded portion WE. The welded portion WE may be formed by fillet welding without beveling.

Subsequently, the other half piece 24A is placed against the fixed one half piece 24A so that one honeycomb hollow column 24 is formed. The lower end of the other half piece 24A is welded to the inner plate 21 to form the welded portion WE. Further, the side edge 243 of one half piece 24A and the side edge 243 of the other half piece 24A facing each other are welded to form a welded portion WE for fixing the half pieces 24A. The side edges 243 of the half pieces 24A are desirably shaped so that a natural bevel is formed where the one side edge 243 and the other side edge 243 meet. Alternatively, the honeycomb hollow column 24 may be welded to the inner plate 21 after the honeycomb hollow column 24 is formed by welding the pair of half pieces 24A.

After one honeycomb hollow column 24 is formed, another honeycomb hollow column 24 is formed adjacent thereto in the same procedure. Finally, as shown in FIG. 5 , a plurality of honeycomb hollow columns 24 are densely arranged in a honeycomb shape on the inner plate 21 to form a honeycomb structure 23 . In the vicinity of the peripheral edge of the inner plate 21, there may be a place where one honeycomb hollow column 24 cannot be accommodated. At such locations, only the half pieces 24A can be placed as shown in FIG. Alternatively, after the inner plate 21 and the inner plate 21 of the other outer tank panel 2 are welded to each other, the honeycomb hollow column 24 may be inserted into the space.

After that, the hexagonal lid piece 25 is fixed to the second open end 242 of each honeycomb hollow column 24 . The hexagonal lid piece 25 is a flat plate having a hexagonal shape in a plan view and having a size that closes the opening of the second open end 242 . The fixation of the hexagonal lid piece 25 can be achieved by welding using the groove formed in the second open end 242 or the groove formed in the side edge of the hexagonal lid piece 25 . Instead of welding, the hexagonal lid piece 25 may be fixed to the second open end 242 using fasteners such as fastening bolts.

By fixing the hexagonal lid pieces 25 to all of the honeycomb hollow columns 24 fixed to the inner plate 21 , an assembly of these hexagonal lid pieces 25 constitutes the outer plate 22 of the outer tank panel 2 . In order to improve the strength of the outer plate 22, which is an assembly of the hexagonal lid pieces 25, it is desirable to form a welded portion WE by welding the edges of the adjacent hexagonal lid pieces 25 together, as shown in FIG. .

An example of the dimensions of each part constituting the outer tank panel 2 is shown. The thickness t1 of the inner plate 21 is desirably a thickness that facilitates bending or butt welding with the adjacent inner plate 21, and can be selected from a range of 15 mm to 40 mm, for example. The thickness t2 of the outer plate 22, that is, the hexagonal lid piece 25 can be selected from a range of 10 mm to 30 mm, for example. The thickness t3 of the honeycomb hollow column 24 can be selected from a range of approximately 8 mm to 15 mm, and the height h of the honeycomb hollow column 24 can be selected from a range of 100 mm to 200 mm. Further, the width w of one honeycomb hollow column 24 depends on the diameter of the tank body 10, but can be set to approximately 2.0 m to 3.0 m.

As described above, in the present embodiment, the outer tank panel 2 used as a segment of the outer tank 11 has a sandwich structure composed of the honeycomb structure 23 composed of the inner plate 21, the outer plate 22, and the plurality of honeycomb hollow columns 24. have. The outer tank panel 2 having such a sandwich structure is lightweight due to the use of a plurality of honeycomb hollow columns 24 having hollow portions, and has high rigidity due to the honeycomb structure. Processing such as spherical surface processing of the outer tank panel 2 can be performed on the inner plate 21 or the outer plate 22 alone, and connection by welding can be performed between adjacent inner plates 21 or outer plates 22 . In addition, the rigidity of the outer tank panel 2 can be ensured by the honeycomb-arranged honeycomb hollow columns 24, so that the thickness of the inner plate 21 and the outer plate 22 can be reduced. Therefore, it is possible to provide the low-temperature liquefied gas tank 1 excellent in workability and assembly.

[How to build a tank]
FIG. 6 is a schematic diagram for explaining an example of a construction method of the low-temperature liquefied gas tank 1. As shown in FIG. Here, only the construction procedure of the tank body 10 is shown. In FIG. 6, the work is divided into work on the factory side and work on the tank installation site side. At the factory, a process S11 of fabricating a plurality of inner tank panels, which are segments of the inner tank 12, and a process S12 of fabricating an outer tank panel intermediate body 20, which is an intermediate product before completion of the outer tank panel 2, are performed. will be At the tank installation site, a process S21 of assembling the inner tank 12 using the inner tank panel and a process S22 of assembling the outer tank 11 using the outer tank panel intermediate body 20 are performed.

In step S<b>11 , an inner tank panel is produced by bending a rectangular flat plate made of, for example, a stainless steel plate and having a predetermined size along the spherical diameter of the inner tank 12 . The required number of manufactured inner tank panels are carried to the tank installation site. In step S21, the prepared inner tank panel group is sequentially assembled and welded so as to form a spherical shape, and the inner tank 12 is assembled. Since the construction method of the inner tank 12 is the same as before, its details are omitted.

In step S12, the inner plate 21 and the honeycomb hollow columns 24 that constitute the outer tank panel 2 are prepared. The inner plate 21 is a rectangular flat plate of a predetermined size made of carbon steel, for example. The inner plate 21 is bent so as to have a spherical surface along the inner diameter of the outer tank 11 to form a spherical piece. The honeycomb hollow column 24 is made of, for example, carbon steel, and as illustrated in FIG. It is a hexagonal cylindrical body having

When manufacturing the outer tank panel intermediate body 20, a plurality of honeycomb hollow columns 24 are arranged in a honeycomb pattern on the convex surface of the inner plate 21 that has been bent, and the first open ends 241 thereof are welded. to secure it. As illustrated in FIG. 4, when a pair of half pieces 24A constitutes one honeycomb hollow column 24, the pair of half pieces 24A are integrated in advance by welding to produce the honeycomb hollow column 24, and then the inner plate is The honeycomb hollow column 24 may be welded and fixed to the inner plate 21, or may be welded and fixed to the inner plate 21 in units of half pieces 24A. By fixing the required number of honeycomb hollow columns 24 to the inner plate 21 to form the honeycomb structure 23, the manufacture of the outer tank panel intermediate body 20 is completed. At the stage of this step S12, the hexagonal lid piece 25 that constitutes the outer plate 22 is not attached to the second open end 242 of the honeycomb hollow column 24 . The manufactured outer tank panel intermediate body 20 is carried to the tank installation site.

The assembly of the outer tub 11 in step S22 includes a step S23 of welding the inner plates 21 of the adjacent outer tub panel intermediates 20 together and a step S24 of welding and fixing the hexagonal lid pieces 25 to the honeycomb hollow columns 24 . In step S23, while a plurality of outer tank panel intermediate bodies 20 are assembled into a spherical shape so as to surround the inner tank 12, side edges of adjacent inner plates 21 are joined by, for example, butt welding. FIG. 6 schematically shows a state in which three outer tub panel intermediate bodies 20 are joined together at the welded portion WE. Actually, the joined body of the outer tub panel intermediate body 20 has a spherically curved shape along the shape of the outer tub 11 . The outer tank panel intermediate body 20 is assembled in a spherical shape so that adjacent inner plates 21 do not form a cross joint.

In step S<b>24 , hexagonal lid pieces 25 are prepared for each honeycomb hollow column 24 . A hexagonal lid piece 25 is fixed by welding to each of the second open ends 242 of the honeycomb hollow columns 24 . Also, as shown in FIG. 5, adjacent hexagonal lid pieces 25 are also fixed by welding. The outer tank 11 is produced by the above operations. If there is a portion near the peripheral edge of the inner plate 21 where the honeycomb hollow column 24 is not loaded, the honeycomb hollow column 24 is welded so as to straddle the adjacent inner plates 21 . At this time, it is desirable to remove scallops so that the welded portion WE between the inner plates 21 and the welded portion WE between the honeycomb hollow column 24 and the inner plate 21 do not overlap.

According to the method for constructing the cryogenic liquefied gas tank 1 described above, part of the work for constructing the outer tank 11 using the outer tank panel 2 having a sandwich structure composed of the inner plate 21, the outer plate 22, and the honeycomb structure 23 can be done at the factory and the rest of the work can be done at the tank installation site. That is, since the outer tank panel intermediate body 20 is factory-manufactured, the workability of manufacturing the outer tank panel 2 is improved, and the welding work at the tank installation site can be suppressed. As a result, the workability of tank construction can be improved. Further, the outer tank 11 using the outer tank panel 2 having a sandwich structure is lightweight, can be easily bent and welded, and has strength to withstand a large external vacuum pressure. Therefore, the low-temperature liquefied gas tank 1 of this embodiment is suitable as a large-capacity tank adopting a vacuum insulation type for storing liquefied hydrogen gas, for example.

[Summary of this disclosure]
The specific embodiments described above include disclosures having the following configurations.

A cryogenic liquefied gas tank according to one aspect of the present disclosure includes an inner tank for storing cryogenic liquefied gas, an assembly of a plurality of panels, an outer tank surrounding the inner tank, and a space between the inner tank and the outer tank. the panel includes an inner plate and an outer plate facing each other at a predetermined interval, and a plurality of tubular bodies disposed between the inner plate and the outer plate .

According to this cryogenic liquefied gas tank, a panel having a sandwich structure composed of an inner plate, an outer plate, and a plurality of cylindrical bodies is used as a constituent member of the outer tank. Such a sandwich-structured panel is lightweight due to the use of a plurality of cylindrical bodies, and has high rigidity. Processing such as spherical surface processing of the panel can be performed on the inner plate or outer plate alone, and welding connection or the like can be performed on adjacent inner plates or outer plates. In addition, since the rigidity of the panel can be ensured with a plurality of cylindrical bodies, the thickness of the inner plate and the outer plate can be reduced. Therefore, it is possible to provide a low-temperature liquefied gas tank which is excellent in workability and assembling property of the panel.

In the low-temperature liquefied gas tank described above, the cylindrical body has a first open end that is fixed to the inner plate and a second open end that is fixed to the outer plate, and the inner plate is , the first open ends of the plurality of cylindrical bodies are formed of a plate material to which the first open ends can be fixed, and the outer plate is a set of lid pieces individually fixed to the second open ends of the respective cylindrical bodies. preferably formed.

According to this low-temperature liquefied gas tank, since the outer plate consists of a set of lids fixed to the individual cylindrical bodies, the bonding between the outer plate and the cylindrical body is more difficult than in the case of using a single outer plate. Work can be facilitated. Alternatively, for example, by manufacturing a panel intermediate body in which a plurality of cylindrical bodies are attached to an inner plate at a factory, assembling the panel intermediate body at the tank installation site, and attaching a lid piece to the second open end of the cylindrical body It is possible to construct an outer tank with excellent workability.

In the low-temperature liquefied gas tank described above, it is preferable that the cylindrical body is a square cylinder, and that the square cylinders have a shape that allows a plurality of square cylinders to be arranged without gaps.

According to this low-temperature liquefied gas tank, the outer tank panel can have a honeycomb sandwich structure in which the honeycomb-arranged rectangular cylinders are sandwiched between the inner and outer plates. Therefore, it is possible to increase the rigidity of the panel, and it is easier to cope with an increase in tank capacity.

In particular, it is desirable that the rectangular tubular body is a honeycomb hollow column having a regular hexagonal cross section. With this aspect, it is possible to further increase the rigidity of the panel.

A method for constructing a cryogenic liquefied gas tank according to another aspect of the present disclosure includes an inner tank for storing cryogenic liquefied gas, an outer tank surrounding the inner tank, a vacuum layer between the inner tank and the outer tank, A method for constructing a low-temperature liquefied gas tank comprising: preparing a cylindrical body having a first open end on one end side and a second open end on the other end side; A plurality of panel intermediate bodies are produced by fixing the first opening ends of the plurality of cylindrical bodies to an inner plate made of The outer tank is produced by assembling the panel intermediate body of No. and fixing a lid piece to each of the second open ends of the cylindrical body.

According to this method of constructing a low-temperature liquefied gas tank, part of the work for constructing the outer tank can be carried out as factory work, and the rest of the work can be carried out at the tank installation site, thereby improving the workability of constructing the tank. That is, a panel intermediate body in which a plurality of cylindrical bodies are attached to an inner plate is manufactured in a factory and carried to the tank installation site. Then, the inner plates are joined together to assemble the panel intermediate body into the shape of the outer tank, and the outer tank can be manufactured by attaching a lid piece constituting the outer plate to the second opening end.

1 low-temperature liquefied gas tank 11 outer tank 12 inner tank 13 vacuum insulation layer (vacuum layer)
2 Outer tank panel (panel)
20 outer tank panel intermediate (panel intermediate)
21 inner plate 22 outer plate 23 honeycomb structure 24 honeycomb hollow column (square cylinder)
241 First open end 242 Second open end 25 Hexagonal lid piece (lid piece)
LG Cryogenic liquefied gas

Claims (5)

an inner tank for storing cryogenic liquefied gas;
an outer tank comprising an assembly of a plurality of panels and surrounding the inner tank;
a vacuum layer between the inner tank and the outer tank;
The low-temperature liquefied gas tank, wherein the panel includes an inner plate and an outer plate facing each other with a predetermined gap therebetween, and a plurality of cylindrical bodies disposed between the inner plate and the outer plate. In the cryogenic liquefied gas tank according to claim 1,
The cylindrical body has a first open end that is fixed to the inner plate and a second open end that is fixed to the outer plate,
The inner plate is formed of a plate material to which the first open ends of the plurality of cylindrical bodies can be fixed,
The low-temperature liquefied gas tank, wherein the outer plate is formed by a set of lid pieces individually fixed to the second opening end of each of the cylindrical bodies. In the cryogenic liquefied gas tank according to claim 1 or 2,
The low-temperature liquefied gas tank, wherein the tubular body is a square tubular body, and a plurality of square tubular bodies can be arranged without gaps. In the cryogenic liquefied gas tank according to claim 3,
The low-temperature liquefied gas tank, wherein the square cylinder is a honeycomb hollow column having a regular hexagonal cross section. A method for constructing a cryogenic liquefied gas tank comprising an inner tank for storing cryogenic liquefied gas, an outer tank surrounding the inner tank, and a vacuum layer between the inner tank and the outer tank,
preparing a cylindrical body having a first open end on one end side and a second open end on the other end side;
Producing the inner tank,
preparing a plurality of panel intermediates each having the first opening ends of the plurality of cylindrical bodies fixed to an inner plate made of a spherical piece of a predetermined size;
By joining the inner plates together, a plurality of the panel intermediate bodies are assembled so as to surround the inner tank, and the outer tank is formed by fixing a cover piece to each of the second open ends of the cylindrical body. A method of constructing a cryogenic liquefied gas tank.

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