KR101131536B1 - Membrane Type Cargo Tank For Liquefied Gas, Method of Manufacturing the same and Ship Having the Same - Google Patents

Abstract

A membrane type liquefied gas storage container, a manufacturing method thereof, and a vessel having the same are disclosed. According to an aspect of the present invention, the insulation layer coupled to the hull, a sandwich plate laminated on the insulation layer to partition the space for storing the liquefied gas, and both ends are respectively coupled to the hull and sandwich plate sandwich A spring for providing elasticity to the plate, wherein the sandwich plate comprises a pair of metal layers and a core layer interposed between the metal layers and comprising a partition wall and a plurality of cells partitioned by the partition walls. There is provided a membrane type liquefied gas storage container comprising a). According to this, by preventing the problem that the membrane-type liquefied gas storage container is fatigue-damaged early by the operating stress due to thermal deformation and the hull behavior, durability of the membrane-type liquefied gas storage container can be improved.

Membrane, Liquefied Gas, Storage, Sandwich Plate

Description

Membrane Type Cargo Tank For Liquefied Gas, Method of Manufacturing the same and Ship Having the Same}

The present invention relates to a membrane-type liquefied gas storage container, a method of manufacturing the same and a vessel having the same.

Inside the LNG vessel carrying liquefied gas, a cargo hold which is a container for storing liquefied gas is provided. These cargo holds are divided into membrane and self-supporting methods, depending on their structure.

1 shows a vessel 1 and a membrane type liquefied gas storage vessel 2 according to the prior art.

Referring to FIG. 1, the conventional membrane-type liquefied gas storage container 2 includes a secondary barrier layer 4 and a secondary barrier adhesively coated on the secondary insulation layer 4 fixed inside the hull 3. (5), consisting of a primary insulation layer 6 adhesively fixed on the secondary barrier 5, and a primary barrier 7 fixed on the primary insulation layer 6, wherein the double insulation and 2 It forms a barrier structure. In this case, a corrugated membrane sheet made of stainless steel was used as the primary barrier 7.

However, according to this prior art, since the corrugated portion of the primary barrier acts as a stress concentration point due to its structure, the repetitive load acts on the primary barrier due to the hull behavior and other factors, or with the cold liquefied gas. There was a problem that the corrugated portion of the primary barrier breaks fatigue early due to a high static stress exceeding the yield strength of the material on the primary barrier due to the thermal stress caused by the contact.

In addition, the corrugated portion of the primary barrier formed in the lattice structure should be perfectly matched three-dimensionally in the storage container, and thus, the primary and secondary insulation layers and the secondary barrier, which are disposed below, are primary. Since there is a restriction to be arranged in correlation with the arrangement of the corrugated portion of the barrier, there is a difficulty in the design of the membrane-type liquefied gas storage container, there is a problem that also increases the process cost and time.

The present invention provides a membrane-type liquefied gas storage container, a manufacturing method thereof, and a ship having the same, which can prevent a problem of premature fatigue failure and improve durability, and reduce manufacturing cost and time.

According to an aspect of the present invention, the insulation layer coupled to the hull, a sandwich plate laminated on the insulation layer to partition the space for storing the liquefied gas, and both ends are respectively coupled to the hull and sandwich plate sandwich A spring for providing elasticity to the plate, wherein the sandwich plate comprises a pair of metal layers and a core layer interposed between the metal layers and comprising a partition wall and a plurality of cells partitioned by the partition walls. There is provided a membrane type liquefied gas storage container comprising a).

The membrane-type liquefied gas storage container may further include a stopper for restricting the movement of the sandwich plate beyond a preset range.

The stopper may be a wire at both ends coupled to the hull and the sandwich plate, respectively.

The stopper may be a restraining member installed below the sandwich plate.

The membrane-type liquefied gas storage container may further include a damper interposed between the hull and the sandwich plate to dampen the impact acting on the sandwich plate.

The sandwich plate may be disposed in plural to be spaced apart from each other, and the membrane-type liquefied gas storage container may further include a connection member connecting the plurality of sandwich plates.

Any one of the pair of metal layers extends to protrude from the core layer, and the spring may be coupled to the protruding portion of any one of the pair of metal layers.

The connection member may include a lower plate connecting lower portions of the plurality of sandwich plates, and an upper plate connecting upper portions of the plurality of sandwich plates.

The metal layer and the connection member may be made of the same material.

The membrane type liquefied gas storage container may further include a first heat insulating member inserted into a space where the plurality of sandwich plates are spaced apart from each other.

The partition wall may extend along the thickness direction of the metal layer so that the core layer has a honeycomb structure.

The partition wall may extend along the width direction of the metal layer.

The partition wall may be a rib including a plurality of partitions for partitioning a plurality of cells and a plurality of connecting portions for connecting end portions of the plurality of partitions.

The partition wall may be a plurality of section steels arranged side by side along a direction perpendicular to the width direction of the metal layer.

The metal layer and the partition wall may be integrally formed by an extrusion process.

The metal layer and the core layer may be made of the same material.

The metal layer and the core layer may be made of a material including aluminum (Al) or stainless steel.

The membrane type liquefied gas storage container may further include an adhesive layer interposed between the metal layer and the core layer to adhere the metal layer and the core layer.

The membrane type liquefied gas storage container may further include a second heat insulating member filled in the plurality of cells.

The insulation layer and the second insulation member may be made of the same material.

In addition, according to another aspect of the present invention, there is provided a vessel including the membrane-type liquefied gas storage container described above.

Also according to another aspect of the invention, a sandwich plate comprising a pair of metal layers and a core layer interposed between the metal layers and comprising a partition wall and a plurality of cells partitioned by the partition walls. A method of manufacturing a membrane-type liquefied gas storage container is provided that includes providing a sandwich plate, bonding an insulation layer inside the hull, and stacking a sandwich plate on the insulation layer.

The method for manufacturing a membrane-type liquefied gas storage container further includes coupling one end of the spring to the hull prior to laminating the sandwich plate, and after laminating the sandwich plate, coupling the other end of the spring to the sandwich plate. It may further comprise the step.

The sandwich plates are arranged in plural so as to be spaced apart from each other, and the method of manufacturing a membrane-type liquefied gas storage container may further include connecting the plurality of sandwich plates to the connecting member after the step of stacking the sandwich plates.

Connecting the plurality of sandwich plates may include connecting the lower portions of the plurality of sandwich plates to the lower plate, and connecting the upper portions of the plurality of sandwich plates to the upper plate.

The metal layer and the connection member may be made of the same material.

The method for manufacturing a membrane-type liquefied gas storage container includes inserting a first heat insulating member into a space spaced from a plurality of sandwich plates between connecting a lower portion of the plurality of sandwich plates and connecting an upper portion of the plurality of sandwich plates. It may further comprise a step.

Any one of the pair of metal layers extends to protrude from the core layer, and the step of coupling the other end of the spring to the sandwich plate may be performed by coupling the spring to the protruding portion of any one of the pair of metal layers.

The method for manufacturing a membrane-type liquefied gas storage container may further include installing a stopper to restrict the sandwich plate from moving beyond a preset range before the connecting of the plurality of sandwich plates.

Installing the stopper may be performed by coupling both ends of the wire to the hull and the sandwich plate, respectively.

The step of installing the stopper may be performed by installing the restraint member at the bottom of the sandwich plate.

The method for manufacturing a membrane-type liquefied gas storage container may further include installing a damper between the hull and the sandwich plate before the step of connecting the plurality of sandwich plates to mitigate the impact acting on the sandwich plate. have.

The partition wall may extend along the thickness direction of the metal layer so that the core layer has a honeycomb structure.

The partition wall may extend along the width direction of the metal layer.

The partition wall may be a rib including a plurality of partitions for partitioning a plurality of cells and a plurality of connecting portions for connecting end portions of the plurality of partitions.

The partition wall may be a plurality of section steels arranged side by side along a direction perpendicular to the width direction of the metal layer.

The metal layer and the partition wall may be integrally formed by an extrusion process.

The metal layer and the core layer may be made of the same material.

The metal layer and the core layer may be made of a material including aluminum (Al) or stainless steel.

The sandwich plate may further include an adhesive layer interposed between the metal layer and the core layer to adhere the metal layer and the core layer.

The sandwich plate further comprises a second heat insulating member filled in the plurality of cells.

The insulation layer and the second insulation member may be made of the same material.

According to the present invention, the durability of the membrane-type liquefied gas storage container can be improved by preventing the membrane-type liquefied gas storage container from fatigue failure early due to the working stress caused by thermal deformation and hull behavior.

In addition, the layout and design of the sandwich plate can be facilitated, thereby reducing the manufacturing cost and time of the membrane-type liquefied gas storage container.

The membrane-type liquefied gas storage container according to the present invention, a method for manufacturing the same and an embodiment of a ship having the same will be described in detail with reference to the accompanying drawings, in the following description, the same or corresponding components The same reference numerals will be given and redundant description thereof will be omitted.

2 is a view showing an embodiment of a membrane-type liquefied gas storage container 100 and a vessel 10 having the same according to an aspect of the present invention. Figure 3 is a schematic diagram showing an embodiment of a membrane type liquefied gas storage container 100 according to an aspect of the present invention. Figure 4 is a perspective view showing an embodiment of a membrane type liquefied gas storage container 100 according to an aspect of the present invention.

According to the present embodiment, as shown in FIGS. 2 to 4, the insulation plate 120, the sandwich plate 110 having the metal layers 111 and 112 and the core layer 113, and the spring 130 are provided. A membrane type liquefied gas storage container 100 is provided that includes.

And, as shown in Figure 2, the vessel 10 is provided with such a membrane-type liquefied gas storage container 100 inside the hull (15).

According to the present embodiment as described above, unlike the prior art, by placing the sandwich plate 110 without the separate wrinkles while having the function of the double barrier itself on the heat insulating material layer double insulation and double barrier. And the sandwich plate 110 is coupled to the hull 15 by the spring 130 so that the sandwich plate 110 can flow on the heat insulation layer 120, thereby the heat deformation and the hull by contact with the cryogenic liquefied gas. Since the membrane liquefied gas storage container 100 can be prevented from fatigue damage early due to the stress applied according to the behavior of 15, and as a result, the durability of the membrane liquefied gas storage container 100 can be improved. Can be.

In addition, by implementing a double barrier with a sandwich plate 110 having no separate wrinkles, the degree of freedom in the arrangement and design of the insulation layer 120 and the sandwich plate 110 is increased, the layout and design of the sandwich plate 110 Since it becomes easy, as a result, the manufacturing cost and time of the membrane-type liquefied gas storage container 100 can be reduced.

Hereinafter, with reference to FIGS. 2 to 21, each configuration of the membrane type liquefied gas storage container 100 will be described in more detail.

5 is an exploded perspective view showing a part of an embodiment of the membrane-type liquefied gas storage container 100 according to an aspect of the present invention. 6 is an exploded perspective view showing a part of an embodiment of the membrane-type liquefied gas storage container 100 according to an aspect of the present invention. 7 is a cross-sectional view showing an embodiment of the membrane-type liquefied gas storage container 100 according to an aspect of the present invention.

As shown in FIGS. 5 to 7, the heat insulating material layer 120 is coupled to the hull 15 to perform a function of secondary heat insulation. That is, after the studs formed in the inner hull of the hull 15 are inserted into the holes formed in the heat insulating material layer 120, the bolts 192 are fastened to the end portions of the studs, whereby the heat insulating material layer 120 is hull ( 15) It can be fixed inside.

In this case, as shown in FIG. 7, a mastic 190 is formed on the inner hull surface of the hull 15 to transfer the load of the liquefied gas storage container and the liquefied gas stored therein to the hull 15. .

In addition, as illustrated in FIGS. 5 to 7, a plurality of insulation layers 120 are disposed in the hull 15 and spaced apart from each other, and the first insertion member 196 may be inserted into the spaces in which the insulation layers 120 are spaced apart from each other. have. The first insertion member 196 may be made of, for example, polyurethane.

5 to 7, the sandwich plate 110 is stacked on the heat insulating material layer 120 to define a space for storing the liquefied gas. That is, the plurality of sandwich plates 110 are disposed on the insulation layer 120 so as to be spaced apart from each other by a predetermined interval, and connected to each other by the connecting member 170, the membrane type having a space for storing the liquefied gas therein Liquefied gas storage container 100 may be implemented.

In this case, as shown in FIGS. 5 to 7, the first heat insulating member 180 may be inserted into a space where the plurality of sandwich plates 110 are spaced apart from each other. The first heat insulating member 180 may be made of, for example, polyurethane. Of course, the first heat insulating member 180 may be omitted, which will be described later in the description of another embodiment of the present invention with reference to FIG. 9.

5 to 7, the sandwich plate 110 may be formed of the metal layers 111 and 112, the core layer 113, and the second heat insulating member 118.

As shown in FIGS. 5 to 7, the pair of metal layers 111 and 112 are disposed to be spaced apart from each other by a predetermined distance. As such, since the sandwich plate 110 has a double structure in which the metal layers 111 and 112 are disposed in pairs, the sandwich plate 110 forms the membrane-type liquefied gas storage container 100 using the sandwich plate 110 itself. Can function as a double barrier.

Unlike the conventional primary barrier, the pair of metal layers 111 and 112 do not have wrinkles and have a flat surface, and thus there is no stress concentration part. Therefore, the heat deformation and the hull 15 by contact with the cryogenic liquefied gas It is possible to prevent the problem that the membrane-type liquefied gas storage container 100 is fatigue-damaged early by the stress applied according to the behavior of the.

In addition, since there are no separate wrinkles in the metal layers 111 and 112, a design for matching the shape of the wrinkles is unnecessary, so that the insulation layer 120 and the sandwich plate 110 are easily disposed and designed. As a result, manufacturing cost and time of the membrane type liquefied gas storage container 100 can be reduced.

As illustrated in FIGS. 5 to 7, the core layer 113 may be disposed between the metal layers 111 and 112 and may be bonded to the metal layers 111 and 112 by welding or adhesive. The core layer 113 may include a partition wall 114 and a plurality of cells 115 partitioned by the partition wall 114, as shown in FIGS. 5 to 7.

In this case, the partition wall 114 may extend in the vertical direction along the thickness direction of the metal layers 111 and 112 or may extend in the horizontal direction along the width direction, and the partition wall 114 may allow the metal layer 111, The spaces between the 112 may be divided into a plurality of sections and partitioned to form a plurality of cells 115.

As the core layer 113 is composed of the partition wall 114 and the plurality of cells 115 partitioned by the core layer 113, the structural rigidity of the sandwich plate 110 may be significantly improved relative to its weight.

The core layer 113 has the same thermal characteristics (coefficient of thermal expansion, thermal conductivity, and the like) of the metal layers 111 and 112. More specifically, the core layer 113 and the metal layers 111 and 112 may be made of the same material including, for example, aluminum (Al) or stainless steel.

As such, the core layer 113 and the metal layers 111 and 112 are made of the same material having the same thermal expansion coefficient and thermal conductivity, so that the sandwich plate 110 is welded when the membrane-type liquefied gas storage container 100 is manufactured. Thermal stress generated at the bonding interface between the metal layers 111 and 112 and the core layer 113 even when the sandwich plate 110 is heated or cooled by the cryogenic liquefied gas inside the membrane-type liquefied gas storage container 100. This can be minimized, and thus, breakage of the membrane type liquefied gas storage container 100 can be minimized.

As shown in FIGS. 5 to 7, the second heat insulating member 118 is filled in the plurality of cells 115, and the second heat insulating member 118 performs the function of primary heat insulation. The second heat insulating member 118 may be made of the same material as the heat insulating material layer 120. Of course, the second heat insulating member 118 may be omitted, which will be described later in the description of another embodiment of the present invention with reference to FIG. 9.

Although the basic configuration of the sandwich plate 110 has been described above, the configuration of the sandwich plate 110 of the present embodiment can be variously modified. A representative example thereof will be described later with reference to FIGS. 10 to 21.

As illustrated in FIGS. 5 to 7, the connection member 170 may include a plurality of sandwich plates 110 arranged in a polyhedron shape on the heat insulating material layer 120 to partition a space for storing liquefied gas. As a means for connecting, it may be bonded to the metal layers 111 and 112 of each sandwich plate 110 by welding.

In this case, the connecting member 170 also has the same thermal characteristics as the metal layers 111 and 112 and the core layer 113, that is, the same coefficient of thermal expansion and the same thermal conductivity. That is, the connection member 170 may be made of the same material as the metal layers 111 and 112 and the core layer 113, and may be made of, for example, a material including aluminum or stainless steel.

As described above, the connection member 170 has the same thermal characteristics (coefficient of thermal expansion and thermal conductivity) as the metal layers 111 and 112 and the core layer 113, so that the connection member 170 is connected to the sandwich plate 110 by welding. Heat generated between the sandwich plate 110 and the connection member 170 even when the member 170 is heated, or the sandwich plate 110 and the connection member 170 are cooled by the cryogenic liquefied gas inside the liquefied gas storage container. The stress may be minimized, and thus, breakage of the membrane type liquefied gas storage container 100 may be minimized.

5 to 7, the connecting member 170 includes a lower plate 172 connecting lower portions of the plurality of sandwich plates 110 and an upper plate connecting upper portions of the plurality of sandwich plates 110. 174.

In this case, as shown in FIG. 7, one of the pair of metal layers 111 and 112, that is, the lower metal layer 111 may extend to protrude in the horizontal direction from the core layer 113. Likewise, the ends of the springs 130 to be described later are joined by the bolts 194 between the protruding portions of the metal layer 111, and the lower plate 172 covers the ends of the springs 130 and the bolts 194. While being coupled to the protruding portion of the metal layer 111 by welding or the like.

On the lower plate 172, as shown in FIG. 7, the above-described first heat insulating member 180 is inserted, and the upper plate 174 covers the first heat insulating member 180 and the upper side metal layer 112. ) And by welding or the like.

As shown in FIGS. 5 to 7, the spring 130 is coupled to the hull 15 and the sandwich plate 110 to provide elastic force to the sandwich plate 110, respectively. That is, the spring 130 is interposed between the hull 15 and the sandwich plate 110 to provide an elastic force therebetween, so that the sandwich plate 110 can flow to the hull 15 within a predetermined range. Supported.

As shown in FIG. 3, the membrane type liquefied gas storage container 100 may be contracted or expanded under the influence of liquefied gas therein. At this time, the sandwich plate 110 is not firmly fixed on the hull 15 or the heat insulating material layer 120, but is coupled to the hull 15 by the spring 130, so that such contraction and expansion occurs. Since the sandwich plate 110 may move by the displacement due to the thermal deformation, the stress applied to the sandwich plate 110 may be minimized.

More specifically, the spring 130 is disposed in the hole formed in the first insertion member 196 to correspond to the position of the spring 130, as shown in Figures 5-7, the hole and the spring 130 The second inserting member 198 is inserted into the free space between the. The second insertion member 198 may be made of, for example, glass wool.

The stopper may restrict the sandwich plate 110 from moving beyond the preset range. That is, the sandwich plate 110 is not firmly fixed on the heat insulating material layer 120, but is coupled to flow to some extent by the spring 130, so as to restrain the maximum displacement of the sandwich plate 110. The stopper is installed.

In the present embodiment, as a stopper, as shown in FIG. 7, a wire 140 coupled to the hull 15 and the sandwich plate 110 and more specifically to both ends of the spring 130 may be used. Can be. As shown in FIG. 7, the wire 140 has a length greater than the length of the spring 130, thereby restraining the sandwich plate 110 from moving beyond the maximum displacement.

Meanwhile, as shown in FIG. 3, a restraining member 150 installed below the sandwich plate 110 may be used as a stopper, and the restraining member 150 may be installed below the sandwich plate 110. The sandwich plate 110 may be constrained to move more than the maximum movement displacement in the downward direction.

The damper 160 is interposed between the hull 15 and the sandwich plate 110 to mitigate the impact acting on the sandwich plate 110. That is, since the impact may be applied to the sandwich plate 110 by sloshing or the like of the liquefied gas stored inside the sandwich plate 110, the hull 15 and the sandwich plate 110 may be buffered against such impact. The damper 160 may be installed therebetween.

Here, the damper 160 may be an air damper 160 and may be coupled to the inside of the spring 130 as shown in FIG. 8. 8 is a perspective view showing an embodiment of a spring 130 constituting the membrane type liquefied gas storage container 100 according to an aspect of the present invention.

Meanwhile, FIG. 9 illustrates another embodiment of the membrane type liquefied gas storage container 100 according to an aspect of the present invention. 9 is a cross-sectional view showing another embodiment of the membrane-type liquefied gas storage container 100 according to an aspect of the present invention.

Referring to FIG. 9, the second heat insulating member 118 is not filled in the cell 115 of the core layer 113, and the first heat insulating member 180 is inserted into the spaced space between the sandwich plates 110. A membrane type liquefied gas storage container 100 is presented.

In the cell 115 of the core layer 113 of the sandwich plate 110, as shown in FIG. 9, a space may be maintained without filling the second heat insulating member 118, and thus, a plurality of cells So-called nitrogen purging (N ₂ purging), for example, filling nitrogen gas or the like into the inside is possible.

In this case, even between the sandwich plates 110, as shown in FIG. 9, the space partitioned by the upper plate 174 and the lower plate 172 may be maintained without filling the second heat insulating member 118. The space may be provided as a flow path for filling nitrogen gas into each cell 115.

Since the liquefied gas injected into the membrane-type liquefied gas storage container 100 is a cryogenic state of, for example, -45 to -196 degrees Celsius, when air flows into the cell 115 inside the core layer 113, moisture in the air freezes. Since the membrane type liquefied gas storage container 100 may be damaged, such breakage may be prevented by filling a gas such as nitrogen into each cell 115 of the core layer 113 through nitrogen purging.

10 to 21, the sandwich plate 110 constituting the membrane type liquefied gas storage container 100 according to the present embodiment will be described in more detail with reference to the core layer 113.

The core layer 113 of the sandwich plate 110 may have a honeycomb structure, a rib structure, or a shaped steel structure, referring to FIGS. 10 to 12, 13 to 16, and 17 to 19, respectively. Explain each case.

In addition, the metal layers 111 and 112 and the partition wall 114 of the sandwich plate 110 may be integrally formed by an extrusion process, which will be described below with reference to FIGS. 20 and 21.

First, Figures 10 and 12 is a view showing an embodiment of a sandwich plate 110 constituting the membrane-type liquefied gas storage container 100 according to an aspect of the present invention.

The core layer 113 includes a partition wall 114 and a plurality of cells 115 partitioned thereby, as shown in FIGS. 10 and 11. Here, the partition wall 114 extends in the vertical direction along the thickness direction of the metal layers 111 and 112 so that the core layer 113 has a honeycomb structure. A plurality of cells 115 arranged in a lattice structure may be formed by dividing and partitioning the space between the metal layers 111 and 112 into a plurality.

More specifically, as shown in FIGS. 10 and 11, the partition wall 114 has a hexagonal column shape disposed in the thickness direction of the metal layers 111 and 112, that is, perpendicular to the surfaces of the metal layers 111 and 112. The unit walls of are in continuous contact with each other, and partitions a plurality of spaces between the metal layers (111, 112), thereby forming a plurality of cells 115 having a hexagonal cross section inside the partition wall 114. have.

Since the partition wall 114 is disposed perpendicularly to the metal layers 111 and 112, the sandwich plate 110 may further improve stiffness with respect to a load acting perpendicularly to the metal layers 111 and 112. In addition, since the flexural strength may also be improved due to the presence of spaces in the plurality of cells 115 of the core layer 113, the overall structural rigidity of the sandwich plate 110 may be significantly improved relative to its weight.

In addition, the metal layers 111 and 112 and the core layer 113 may be joined by welding or an adhesive. In the present embodiment, the metal layers 111 and 112 and the core layer 113 are interposed between the adhesive layers 116 and 117. Are bonded to each other by

As shown in FIGS. 10 and 11, the pair of adhesive layers 116 and 117 are interposed between the pair of metal layers 111 and 112 and the core layer 113, respectively, to form the metal layers 111 and 112 and the core. The layer 113 is bonded. That is, as shown in FIG. 11, by placing a pair of adhesive layers 116 and 117 between the upper and lower surfaces of the core layer 113 and the metal layers 111 and 112, respectively, and then heating and compressing them. The sandwich plate 110 may be manufactured. In this case, for example, thin adhesive layers 116 and 117 in the form of a film may be used.

Meanwhile, as shown in FIG. 12, the core layer 113 may be filled with a second heat insulating member 118 inside the plurality of cells 115, and the second heat insulating member 118 may be formed of primary heat insulating material. It will perform the function.

13 to 16 are views showing another embodiment of the sandwich plate 110 constituting the membrane-type liquefied gas storage container 100 according to an aspect of the present invention.

The core layer 113 includes a partition wall 114 and a plurality of cells 115 partitioned thereby, as shown in FIGS. 13-15. Here, the partition wall 114 extends in the horizontal direction along the width direction of the metal layers 111 and 112, and the partition wall 114 divides and partitions a plurality of spaces between the metal layers 111 and 112. A plurality of cells 115 arranged side by side in the horizontal direction may be formed.

More specifically, as shown in FIGS. 13 to 15, the partition wall 114 connects the end portions of the plurality of partitions 114a and the plurality of partitions 114a that partition the plurality of cells 115. It is a rib including a plurality of connecting portions (114b). That is, one end and the other end of the two partition parts 114a adjacent to each other among the plurality of partition parts 114a for partitioning the spaces are alternately connected by the connecting part 114b, and both sides of the partition wall 114 have recesses and The uneven pattern in which the convex portions are repeated is formed.

As shown in FIG. 14, a partition wall 114 having a plurality of valleys may be formed by repeatedly bending the plate. By arranging the partition wall 114 between the metal layers 111 and 112, the space between the metal layers 111 and 112 is divided into a plurality of cells, so that the cell 115 having a parallelogram cross section is formed in the partition wall 114. ) May be formed in plural.

Since the partition wall 114 is disposed between the metal layers 111 and 112, the sandwich plate 110 may further improve rigidity with respect to the load applied to the metal layers 111 and 112, and the core layer 113. Since the flexural strength may also be improved due to the presence of spaces in the plurality of cells 115, the overall structural rigidity of the sandwich plate 110 may be significantly improved relative to its weight.

In addition, the metal layers 111 and 112 and the core layer 113 may be bonded by welding or an adhesive. In the present embodiment, the metal layers 111 and 112 and the core layer 113 are bonded to each other by welding.

Meanwhile, as illustrated in FIG. 16, the core layer 113 may be filled with a second heat insulating member 118 inside the plurality of cells 115, and the second heat insulating member 118 may be formed of primary heat insulating material. It will perform the function.

17 to 19 are views showing another embodiment of the sandwich plate 110 constituting the membrane-like liquefied gas storage container 100 according to an aspect of the present invention.

The core layer 113 includes a partition wall 114 and a plurality of cells 115 partitioned by it, as shown in FIGS. 17 and 18. Here, the partition wall 114 extends in the horizontal direction along the width direction of the metal layers 111 and 112, and the space between the metal layers 111 and 112 is divided and partitioned by the partition wall 114. A plurality of cells 115 disposed side by side in the longitudinal direction of the metal layers 111 and 112 may be formed.

More specifically, as shown in FIGS. 17 and 18, the partition wall 114 is along a direction perpendicular to the width direction of the metal layers 111 and 112, that is, along the length direction of the metal layers 111 and 112. A plurality of section steels arranged side by side. For example, a partition wall 114 may be formed by arranging section steels having an I, II, or III shape in a line in a direction perpendicular to the longitudinal direction thereof, thereby forming a rectangular cross section inside the partition wall 114. A plurality of cells 115 may be formed.

Since the partition wall 114 is disposed between the metal layers 111 and 112, the sandwich plate 110 may further improve rigidity with respect to the load applied to the metal layers 111 and 112, and the core layer 113. Since the flexural strength may also be improved due to the presence of spaces in the plurality of cells 115, the overall structural rigidity of the sandwich plate 110 may be significantly improved relative to its weight.

In addition, the metal layers 111 and 112 and the core layer 113 may be bonded by welding or an adhesive. In the present embodiment, the metal layers 111 and 112 and the core layer 113 are bonded to each other by welding.

Meanwhile, as illustrated in FIG. 19, the core layer 113 may be filled with a second heat insulating member 118 inside the plurality of cells 115, and the second heat insulating member 118 may be formed of primary heat insulating material. It will perform the function.

20 and 21 are cross-sectional views showing another embodiment of the sandwich plate 110 constituting the membrane-like liquefied gas storage container 100 according to an aspect of the present invention.

As shown in FIGS. 20 and 21, the metal layers 111 and 112 and the partition walls 114 may be integrally formed by an extrusion process. That is, the sandwich plate 110 in which the metal layers 111 and 112 and the partition wall 114 are integrally formed by pushing an extruded material such as aluminum by using an extrusion die having a pattern having a shape corresponding to the plurality of cells 115. Can be produced.

20 and 21, the plurality of cells 115 each show a sandwich plate 110 having a triangle or an octagon as an example. In addition, the plurality of cells 115 may have various cross-sectional shapes. The metal layers 111 and 112 and the partition wall 114 may be integrally formed to have a shape, which is also included in the scope of the present invention.

Hereinafter, a method of manufacturing a membrane type liquefied gas storage container 200 according to another aspect of the present invention will be described with reference to FIGS. 22 to 27.

22 is a flow chart showing an embodiment of a method for manufacturing a membrane-type liquefied gas storage container 200 according to another aspect of the present invention. 23 to 27 is a cross-sectional view showing each process of one embodiment of a method for manufacturing a membrane-type liquefied gas storage container 200 according to another aspect of the present invention.

According to the present embodiment, as shown in FIGS. 22 to 27, a step of providing a sandwich plate 210 including a pair of metal layers 211 and 212 and a core layer 213 (S110) and a hull ( 25) installing the stopper between the sandwich plate 210 (S120), installing a damper (160 in FIG. 8) between the hull 25 and the sandwich plate 210 (S130), the spring 230 Coupling one end of the hull (25) (S140), Coupling the insulation layer 220 inside the hull (25) (S150), Laminating the sandwich plate 210 on the insulation layer 220 ( S160), the other end of the spring 230 is coupled to the sandwich plate 210 (S170), and connecting the plurality of sandwich plates 210 to the connection member 270 (S180) including a liquefied membrane A method of manufacturing the gas storage container 200 is provided.

According to the present embodiment as described above, by implementing a double barrier with a sandwich plate 210 having no separate wrinkles, the degree of freedom in the arrangement and design of the insulation layer 220 and the sandwich plate 210 increases the sandwich plate ( Since the arrangement and design of the 210 may be facilitated, the manufacturing cost and time of the membrane type liquefied gas storage container 200 may be reduced as a result.

Hereinafter, each process will be described in more detail with reference to FIGS. 22 to 27.

In the present embodiment, the specific structure and the function thereof of the membrane-type liquefied gas storage container 200 has been described with reference to FIGS. 2 to 19 through the above-described embodiment, so the membrane-type liquefied gas storage container Detailed description of each configuration of 200 will be omitted, and will be described below with reference to the manufacturing process itself of the membrane-type liquefied gas storage container 200.

First, as shown in FIG. 23, a sandwich plate 210 including a pair of metal layers 211 and 212 and a core layer 213 is provided (S110). As shown in the above embodiment, the sandwich plate is interposed between the pair of metal layers 211 and 212 and the metal layers 211 and 212 and divided by the partition wall 214 and the partition wall 214. The core layer 213 may include a cell 215, and a second heat insulating member 118 may be filled in the plurality of cells 215.

The metal layers 211 and 212 and the core layer 213 may be bonded to each other by a welding or adhesive layer 117 of FIG. 10.

In this case, the core layer 213 has the same thermal characteristics (thermal expansion coefficient, thermal conductivity, and the like) as the metal layers 211 and 212. More specifically, the core layer 213 and the metal layers 211 and 212 may be made of the same material including, for example, aluminum (Al) or stainless steel.

As such, since the core layer 213 and the metal layers 211 and 212 are made of the same material having the same thermal expansion coefficient and thermal conductivity, the sandwich plate 210 is welded when the membrane-type liquefied gas storage container 200 is manufactured. Heat generated at the bonding interface between the metal layers 211 and 212 and the core layer 213 even when the sandwich plate 210 is heated or cooled by the cryogenic liquefied gas inside the membrane-type liquefied gas storage container 200. Stress may be minimized, and thus, breakage of the membrane type liquefied gas storage container 200 may be minimized.

Meanwhile, the partition walls 214 of the metal layers 211 and 212 and the core layer 213 may be integrally formed by an extrusion process, as shown in FIGS. 20 and 21. As such, by forming the metal layers 211 and 212 and the partition wall 214 integrally by the extrusion process, the bonding process or the welding process using the adhesive can be omitted, and thus the manufacturing cost and time can be further reduced.

Next, a stopper is installed between the hull 25 and the sandwich plate 210 (S120). In the present embodiment, as a stopper, as shown in FIG. 23, wires 240 each of which is coupled to the hull 25 and the sandwich plate 210, and more specifically, to both ends of the spring 230 may be used. Can be. The wire 240 may be installed inside the spring 230 before the spring 230 is mounted to the hull 25.

Meanwhile, as shown in FIG. 3, a restraining member (150 of FIG. 3) installed below the sandwich plate 210 may be used as a stopper, and the restraining member (150 of FIG. 3) may be used as the sandwich plate 210. ) May be installed at the bottom of the sandwich plate 210 before being stacked on the insulation layer 220.

Meanwhile, a damper (160 in FIG. 8) may be installed between the hull 25 and the sandwich plate 210 (S130). The damper 160 160 of FIG. 8 may be an air damper 160 160 of FIG. 8, and as shown in FIG. 8, coupled to the interior of the spring 230 before the spring 230 is mounted to the hull 25. Can be.

Next, as shown in Figure 23, one end of the spring 230 is coupled to the hull 25 (S140). As described above, one end of the spring 230 having the wire 240 installed therein is fixed to the inner hull of the hull 25.

Next, as shown in FIG. 24, the insulation layer 220 is coupled to the hull 25 (S150). Since the mastic 290 is disposed on the inner hull surface of the hull 25, the plurality of insulation layers 220 are disposed on the mastic 290 so as to be spaced apart from each other about the spring 230, and then the bolts are attached to the studs. By fastening 294, the heat insulating material layer 220 can be fixed to the hull 25.

The first inserting member (196 of FIG. 5) is inserted into the space between the spring 230 and the heat insulating material layer 220, and the first inserting member (196 of FIG. 5) is inserted into the free space between the spring 230 and the spring 230. 2 Insert insertion member 298.

Next, as shown in FIG. 25, the sandwich plate 210 is stacked on the insulation layer 220 (S160), and the other end of the spring 230 is coupled to the sandwich plate 210 (S170). The plurality of sandwich plates 210 are disposed to be spaced apart from each other on the insulation layer 220 with respect to the spring 230. Since the sandwich plate 210 extends so that the lower metal layer 211 protrudes from the core layer 213, the sandwich plate 210 is disposed such that the other end of the spring 230 is positioned between the protruding portions. The spring 230 is fixed to the protruding portion of the metal layer 211 by fastening the bolt 292 to the back and the other end of the spring 230.

Next, as shown in FIG. 26, the plurality of sandwich plates 210 are connected to the connection member 270 (S180). For example, by connecting the plurality of sandwich plates 210 spaced apart from each other by the connecting member 270 by welding or the like, the primary and secondary barriers are completed.

In this case, the connection member 270 may have the same thermal characteristics as that of the metal layers 211 and 212 and the core layer 213, that is, the same thermal expansion coefficient and the same thermal conductivity. That is, the connection member 270 is made of the same material as the metal layers 211 and 212 and the core layer 213, and may be made of, for example, a material including aluminum or stainless steel.

As described above, the connection member 270 has the same thermal characteristics (coefficient of thermal expansion and thermal conductivity) as the metal layers 211 and 212 and the core layer 213, so that the connection member 270 is connected to the sandwich plate 210 by welding. Between the sandwich plate 210 and the connection member 270, even when the member 270 is heated or the sandwich plate 210 and the connection member 270 are cooled by the cryogenic liquefied gas in the liquefied gas storage container 200. Thermal stress generated may be minimized, and thus, breakage of the membrane type liquefied gas storage container 200 may be minimized.

Since the connecting member 270 may be formed of the lower plate 272 and the upper plate 274, the present process also includes a process of connecting lower portions of the plurality of sandwich plates 210 to the lower plate 272, and an upper plate ( 274 may be divided into a process of connecting the upper portions of the plurality of sandwich plates 210.

First, the lower plate 272 is disposed to cover the protruding portion of the lower metal layer 211 and the other end of the spring 230, and then the lower plate 272 and the lower metal layer 211 are connected by welding. The upper plate 274 is disposed to cover the edge of the upper metal layer 212, and then the upper plate 274 and the upper metal layer 212 are connected by welding.

In this case, a first heat insulating member 280 may be inserted between the top plate 274 and the bottom plate 272, and the first heat insulating member 280 may be lowered before the top plate 274 is disposed. May be stacked on plate 272.

As mentioned above, although an embodiment of the present invention has been described, those of ordinary skill in the art may add, change, delete or add components within the scope not departing from the spirit of the present invention described in the claims. The present invention may be modified and changed in various ways, etc., which will also be included within the scope of the present invention.

1 is a view showing a vessel and a membrane-type liquefied gas storage container according to the prior art.

2 is a view showing an embodiment of a membrane-type liquefied gas storage container and a vessel provided with the same according to an aspect of the present invention.

3 is a schematic view showing one embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

Figure 4 is a perspective view showing one embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

5 is an exploded perspective view showing a part of an embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

Figure 6 is an exploded perspective view showing an enlarged portion of an embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

7 is a cross-sectional view showing an embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

8 is a perspective view showing an embodiment of a spring constituting the membrane-type liquefied gas storage container according to an aspect of the present invention.

9 is a cross-sectional view showing another embodiment of a membrane-type liquefied gas storage container according to an aspect of the present invention.

10 to 12 is a view showing an embodiment of a sandwich plate constituting a membrane-type liquefied gas storage container according to an aspect of the present invention.

13 to 16 show another embodiment of the sandwich plate constituting the membrane-type liquefied gas storage container according to an aspect of the present invention.

17 to 19 show another embodiment of a sandwich plate constituting a membrane-type liquefied gas storage container according to an aspect of the present invention.

20 and 21 are cross-sectional views showing another embodiment of the sandwich plate constituting the membrane-type liquefied gas storage container according to an aspect of the present invention.

22 is a flow chart showing an embodiment of a method for manufacturing a membrane-type liquefied gas storage container according to another aspect of the present invention.

23 to 27 is a cross-sectional view showing each process of one embodiment of a method for manufacturing a membrane-type liquefied gas storage container according to another aspect of the present invention.

<Explanation of symbols for the main parts of the drawings>

10: ship

15: hull

100: membrane type liquefied gas storage container

120: insulation layer

110: sandwich plate

111 and 112: metal layer

113: core layer

114: partition wall

114a: compartment

114b: connection

115: cell

116, 117: adhesive layer

118: second heat insulating member

130: spring

140: wire

150: restraint member

160: damper

170: connecting member

172: lower plate

174: upper plate

180: first heat insulating member

190: mastic

192, 194 bolts

196: first insertion member

198: second insertion member

Claims (42)

Insulation layer coupled to the hull; A sandwich plate laminated on the insulation layer and partitioning a space for storing liquefied gas; And Both ends are coupled to the hull and the sandwich plate, respectively, and include a spring to provide elastic force to the sandwich plate, The sandwich plate, A pair of metal layers; And And a core layer interposed between the metal layers and including a partition wall and a plurality of cells partitioned by the partition walls. The method of claim 1, Membrane type liquefied gas storage container further comprises a stopper for limiting movement of the sandwich plate beyond a predetermined range. 3. The method of claim 2, The stopper is a membrane type liquefied gas storage container, characterized in that both ends of the wire (wire) coupled to the hull and the sandwich plate. 3. The method of claim 2, The stopper is a membrane type liquefied gas storage container, characterized in that the restraining member is installed below the sandwich plate. The method of claim 1, Membrane type liquefied gas storage container further comprises a damper interposed between the hull and the sandwich plate to dampen the impact acting on the sandwich plate. 6. The method according to any one of claims 1 to 5, The sandwich plate is disposed in plurality to be spaced apart from each other, Membrane type liquefied gas storage container further comprises a connecting member for connecting the plurality of sandwich plates. The method of claim 6, Any one of the pair of metal layers extends from the core layer, Membrane type liquefied gas storage container, characterized in that the spring is coupled to the protruding portion of any one of the pair of metal layers. The method of claim 6, The connecting member, A lower plate connecting lower portions of the plurality of sandwich plates; And Membrane type liquefied gas storage container characterized in that it comprises a top plate for connecting the top of the plurality of sandwich plate. The method of claim 6, The membrane-type liquefied gas storage container, characterized in that the metal layer and the connecting member is made of the same material. The method of claim 6, Membrane type liquefied gas storage container further comprises a first insulating member is inserted into the space spaced apart the plurality of sandwich plates. 6. The method according to any one of claims 1 to 5, And the partition wall extends along the thickness direction of the metal layer such that the core layer has a honeycomb structure. The method of claim 11, The partition wall is a liquefied gas storage container, characterized in that extending along the width direction of the metal layer. The method of claim 12, The partition wall is a rib-like liquefied gas storage container, characterized in that the rib including a plurality of partitions for partitioning the plurality of cells and a plurality of connecting portions connecting the ends of the plurality of partitions. The method of claim 12, The partition wall is a membrane-type liquefied gas storage container, characterized in that a plurality of section steel disposed side by side in a direction perpendicular to the width direction of the metal layer. The method of claim 12, And the metal layer and the partition wall are integrally formed by an extrusion process. 6. The method according to any one of claims 1 to 5, Membrane type liquefied gas storage container, characterized in that the metal layer and the core layer made of the same material. The method of claim 16, The metal layer and the core layer is a membrane-type liquefied gas storage container, characterized in that made of a material containing aluminum (Al) or stainless steel (stainless steel). 6. The method according to any one of claims 1 to 5, The membrane-type liquefied gas storage container further comprises an adhesive layer interposed between the metal layer and the core layer to adhere the metal layer and the core layer. 6. The method according to any one of claims 1 to 5, Membrane type liquefied gas storage container further comprises a second heat insulating member filled in the plurality of cells. The method of claim 19, Membrane type liquefied gas storage container, characterized in that the heat insulating material layer and the second heat insulating member made of the same material. Ship comprising the membrane-type liquefied gas storage container of any one of claims 1 to 5. Providing a sandwich plate comprising a pair of metal layers and a core layer interposed between the metal layers and a core layer comprising a partition wall and a plurality of cells partitioned by the partition walls. ; Combining the insulation layer inside the hull; And Method of manufacturing a membrane-type liquefied gas storage container comprising the step of laminating the sandwich plate on the insulation layer. The method of claim 22, Before laminating the sandwich plate, Coupling one end of the spring to the hull, After laminating the sandwich plate, Membrane liquefied gas storage container manufacturing method further comprising the step of coupling the other end of the spring to the sandwich plate. 24. The method of claim 23, The sandwich plate is disposed in plurality to be spaced apart from each other, After laminating the sandwich plate, And connecting the plurality of sandwich plates to a connecting member. The method of claim 24, Connecting the plurality of sandwich plates, Connecting lower portions of the plurality of sandwich plates to lower plates; And And connecting the upper portions of the plurality of sandwich plates to an upper plate. The method of claim 24, The method of manufacturing a membrane-type liquefied gas storage container, characterized in that the metal layer and the connecting member is made of the same material. The method of claim 24, Between connecting the bottom of the plurality of sandwich plate and the top of the plurality of sandwich plate, Membrane type liquefied gas storage container manufacturing method further comprising the step of inserting the first heat insulating member in the space spaced apart the sandwich plate. The method of claim 24, Any one of the pair of metal layers extends from the core layer, Coupling the other end of the spring to the sandwich plate, Membrane-type liquefied gas storage container manufacturing method characterized in that by coupling the spring to any one of the projecting portion of the pair of metal layers. The method of claim 24, Prior to connecting the plurality of sandwich plates, And installing a stopper to limit the sandwich plate from moving beyond a preset range. 30. The method of claim 29, The step of installing the stopper, Membrane type liquefied gas storage container manufacturing method characterized in that it is performed by coupling both ends of the wire to the hull and the sandwich plate, respectively. 30. The method of claim 29, The step of installing the stopper, Membrane type liquefied gas storage container manufacturing method characterized in that it is carried out by installing a restraining member in the lower portion of the sandwich plate. The method of claim 24, Prior to connecting the plurality of sandwich plates, And installing a damper between the hull and the sandwich plate to mitigate the impact acting on the sandwich plate. The method according to any one of claims 22 to 32, And the partition wall extends along the thickness direction of the metal layer such that the core layer has a honeycomb structure. The method according to any one of claims 22 to 32, And the partition wall extends along the width direction of the metal layer. The method of claim 34, wherein The partition wall is a rib including a plurality of partitions for partitioning the plurality of cells and a plurality of connecting portions for connecting end portions of the plurality of partitions. The method of claim 34, wherein The partition wall is a membrane-type liquefied gas storage container manufacturing method, characterized in that a plurality of section steel disposed side by side in a direction perpendicular to the width direction of the metal layer. The method of claim 34, wherein And said metal layer and said partition wall are integrally formed by an extrusion process. The method according to any one of claims 22 to 32, Membrane type liquefied gas storage container manufacturing method characterized in that the metal layer and the core layer made of the same material. 39. The method of claim 38, The metal layer and the core layer is a membrane-type liquefied gas storage container manufacturing method, characterized in that made of a material containing aluminum (Al) or stainless steel (stainless steel). The method according to any one of claims 22 to 32, The sandwich plate is a membrane-type liquefied gas storage container manufacturing method further comprises an adhesive layer interposed between the metal layer and the core layer to adhere the metal layer and the core layer. The method according to any one of claims 22 to 32, The sandwich plate further comprises a second heat insulating member filled in the plurality of cells. The method of claim 41, wherein Membrane type liquefied gas storage container manufacturing method characterized in that the heat insulating material layer and the second heat insulating member made of the same material.

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