KR20190114485A - Cargo of liguefied natural gas and method for manufacturing thereof - Google Patents

Abstract

The present invention discloses a liquefied natural gas cargo hold and a manufacturing method thereof. According to one embodiment of the present invention, the liquefied natural gas cargo hold includes: a first barrier forming a storage space of liquefied natural gas and including a flat surface part and a first corrugated part and a second corrugated part connected to the flat surface part and provided to cross over each other; and a reinforcing member provided in the first barrier and adhering to at least one of the first corrugated part and the second corrugated part.

Description

LNG cargo hold and its manufacturing method {CARGO OF LIGUEFIED NATURAL GAS AND METHOD FOR MANUFACTURING THEREOF}

The present invention relates to a LNG cargo hold and a method of manufacturing the same.

In general, liquefied natural gas (LNG) is a fossil fuel containing methane as a main component and a small amount of ethane, propane, etc., and has recently been spotlighted as a low pollution energy source in various technical fields. .

As liquefied natural gas is spotlighted as an energy resource, an efficient transportation method for transporting liquefied natural gas in a large amount from the place of production to the demand site has been continuously reviewed. LNG carriers have been developed.

On the other hand, such a LNG carrier is provided with a cargo (Cargo) that can store and store the liquefied natural gas liquefied in a cryogenic state, in general, the cargo hold is made of a spherical type and a membrane type have.

In particular, membrane-type cargo hold is more widely used than the old type cargo hold because it has a larger loading capacity and easier to manufacture. These membrane-type cargo holds include the Gaz Transport System (NO 96) from the Gaz Transport Et Technigaz (GTT, France) and the Technics System (Mark III). (Technigaz System) is being applied.

Among these, the cargo holds to which the 'Mark III' system is applied (hereinafter referred to as 'Mark III' cargo hold) are described as an example. The Mark III cargo hold is made of a primary barrier made of a stainless steel membrane corrugated barrier and a triplex composite material. A secondary barrier is provided.

In the case of such a conventional LNG cargo hold, when the cryogenic liquefied natural gas is stored, heat shrinkage may occur in the primary barrier. In order to reduce the heat shrinkage phenomenon, wrinkles may be formed in the primary barrier.

However, sloshing caused by movements such as rolling, pitching, etc. generated during the operation of the LNG carrier exerts a large compressive force on the primary barrier. If exceeded, there is a problem that the wrinkles most susceptible to deformation are permanently deformed and the stability of the primary barrier is lowered.

Domestic Patent Publication No. 10-1434150 (registered Aug. 20, 2014)

Embodiments of the present invention have been proposed in view of the problems of the prior art as described above, to provide a liquefied natural gas cargo hold and a method for manufacturing the same that can improve the stability of the primary barrier.

According to an aspect of the invention, the primary barrier to form a storage space for the liquefied natural gas, the first barrier including a first corrugated portion and a second corrugated portion that is connected to and intersect with the plane portion; And a reinforcing member provided inside the first barrier and in close contact with at least one of the first and second wrinkles.

The reinforcing member may further include: a curved portion formed to be bent to be in close contact with at least one of the first and second wrinkles portions; And extending from the curved portion and extending horizontally to be in close contact with the flat portion.

In addition, the primary barrier may include an intersection formed at a portion where the first wrinkle portion and the second wrinkle portion cross each other, and the reinforcing member may be disposed except a portion corresponding to the intersection portion.

The reinforcing member may further include a connecting portion extending from an end portion of the extension portion.

In addition, the reinforcing member may be formed of the same material as the primary barrier.

According to another aspect of the invention, the step of installing a secondary insulating wall inside the hull; Installing a secondary barrier on the secondary insulating wall; Installing a primary insulating wall on the secondary barrier; Installing a bridge panel between two insulation panels disposed adjacent to each other among a plurality of insulation panels constituting the primary insulating wall; Installing a primary barrier on the primary insulating wall and the bridge panel; Installing a flat joint on a separation portion formed between two insulation panels disposed adjacent to each other among a plurality of insulation panels constituting the secondary insulating wall, and installing a reinforcing member on the primary barrier. There can be provided a method for producing a LNG cargo hold.

The installing of the reinforcing member may cover at least a portion of an inner side surface of the planar portion of the primary barrier and at least one inner side surface of the first and second wrinkles portions of the primary barrier. Fabricating the reinforcing member; And coupling the reinforcing member on the primary barrier.

In addition, the step of installing the reinforcing member, the step of manufacturing a reinforcing member that can cover the whole of the planar portion, the first corrugation portion, the second corrugation portion, and the intersection of the primary barrier; Cutting a portion of the reinforcing member corresponding to the intersection; Cutting a portion of the reinforcing member corresponding to a portion of the planar portion; And coupling the reinforcing member on which the portion corresponding to the intersection portion is cut and the portion corresponding to the portion of the plane portion is cut off on the primary barrier.

According to embodiments of the present invention, there is an effect that the stability of the primary barrier can be improved.

In addition, according to embodiments of the present invention, even if breakage occurs in the primary barrier during operation of the LNG carrier, it is possible to quickly and conveniently reinforce the primary barrier by installing a reinforcing member inside the primary barrier. It works.

1 is a cross-sectional view showing a liquefied natural gas cargo hold according to an embodiment of the present invention.
FIG. 2 is a cross-sectional view taken along AA of FIG. 1.
3 is a perspective view illustrating an example of a reinforcing member of the LNG natural cargo hold of FIG. 1.
4 is a perspective view showing a modification of the reinforcing member of the LNG natural cargo hold of FIG.
5 to 8 are views showing a method of manufacturing a liquefied natural gas cargo hold of FIG.

Hereinafter, with reference to the accompanying drawings will be described in detail the configuration and operation according to the embodiment of the present invention. The following description is one of several aspects of the patentable invention and the following description may form part of the detailed description of the invention.

However, in describing the present invention, a detailed description of known configurations or functions may be omitted to clarify the present invention.

As the invention allows for various changes and numerous embodiments, particular embodiments will be illustrated in the drawings and described in detail. However, this is not intended to limit the present invention to specific embodiments, it should be understood as including all modifications, equivalents, and substitutes included in the spirit and scope of the present invention.

Terms including ordinal numbers such as first and second may be used to describe various components, but the components are not limited by such terms. These terms are only used to distinguish one component from another.

When a component is said to be 'connected' or 'connected' to another component, it may be directly connected to or connected to that other component, but it may be understood that another component may exist in between Should be.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. Singular expressions include plural expressions unless the context clearly indicates otherwise.

Hereinafter, a LNG storage window 10 according to embodiments of the present invention will be described with reference to the drawings.

1, a liquefied natural gas cargo hold 10 according to an embodiment of the present invention is a cargo hold for storing cryogenic materials therein, for example, liquefied natural gas installed in the hull 20 of the liquefied natural gas carrier It may be a cargo hold for storage.

Hereinafter, the liquefied natural gas cargo hold 10 according to an embodiment of the present invention has a double barrier structure having a primary barrier made of a stainless steel membrane corrugated barrier and a secondary barrier made of a triplex composite material. For example, the cargo hold is described as an example, but the idea of the present invention is applicable to other cargo hold designed to store not only liquefied natural gas but also cryogenic or high temperature materials.

2 and 3, the liquefied natural gas cargo hold 10 according to an embodiment of the present invention includes a primary barrier 100, a reinforcing member 200, a primary insulating wall 300, and a bridge panel ( 400), secondary barrier 500, secondary insulation wall 600, and flat joint 700.

The primary barrier 100 may form an inner wall surface of the liquefied natural gas cargo hold 10 to provide a storage space of the liquefied natural gas.

In detail, the primary barrier 100 may form an inner wall surface of the LNG cargo hold 10 by welding pieces having a material such as stainless steel to each other.

The primary barrier 100 may be provided to prevent cracks in the welded portion due to heat shrinkage due to contact with the planar portion 110 and the liquefied natural gas. The primary barrier 100 may include a planar portion 110, a first wrinkle portion 120 and a second wrinkle portion 130 that cross each other to form an intersection portion 140.

In this case, the first wrinkle part 120 may extend in a first direction (y-axis direction of FIG. 3). The first wrinkles 120 may be provided in plurality, and the plurality of first wrinkles 120 may be spaced apart from each other along a second direction perpendicular to the first direction (the x-axis direction of FIG. 3). Can be.

The second wrinkles 130 may extend in a second direction (the x-axis direction of FIG. 3). In addition, the plurality of second wrinkles 130 may be provided, and the plurality of second wrinkles 130 may be spaced apart at predetermined intervals along the first direction (y-axis direction of FIG. 3).

Accordingly, even if the primary barrier 100 is heat-shrinked and deformed by the liquefied natural gas, since the deformation is concentrated on the first wrinkle part 120 and the second wrinkle part 130, the flat part 110 continues. The amount of heat shrink at the welded site can be minimized.

However, the first wrinkle portion 120 and the second wrinkle portion 130 has a problem that is vulnerable to breakage when sloshing occurs. Accordingly, the reinforcing member 200 may be disposed inside the primary barrier 100.

The reinforcing member 200 may prevent the first wrinkle part 120 and the second wrinkle part 130 of the primary barrier 100 from being permanently deformed by stress generated by sloshing or the like. To this end, the reinforcing member 200 may be coupled to the inner side of the primary barrier 100, and closely adhered to any one of the first and second wrinkles 120 and 130 of the primary barrier 100. It may be formed to.

On the other hand, the intersection portion 140 formed at the portion where the first wrinkle portion 120 and the second wrinkle portion 130 of the primary barrier 100 intersects the flat portion 110 and the first wrinkle portion 120. Since the sloshing strength is higher than that of the second pleats 130, the reinforcing member 200 may be disposed except for a portion corresponding to the intersection 140.

Specifically, the reinforcing member 200 may include a curved portion 210 and an extension 220.

The curved portion 210 may be formed to be bent to be in close contact with an inner surface of any one of the first wrinkle portion 120 and the second wrinkle portion 130 of the primary barrier 100. As a result, the liquefied natural gas may contact the curved portion 210 earlier than the first and second wrinkle portions 120 and 130 of the primary barrier 100. That is, since the stress generated by the sloshing or the like is applied to the curved portion 210 rather than the first wrinkle portion 120 and the second wrinkle portion 130 of the primary barrier 100, the primary barrier by liquefied natural gas Breakage of 100 can be minimized.

The extension part 220 may extend from the curved part 210 and may be horizontally formed to be in close contact with the inner surface of the planar part 110 of the primary barrier 100. In this case, the extension part 200 may extend from both end portions of the curved part 210. Here, the extension part 200 is not entirely covered by the extension part 200 of the plane part 110 of the primary barrier 100, but is partially covered by the extension part 200. It may extend from both ends of the curved portion 210 to the extent possible.

On the other hand, the extension 220 may be coupled to the inner surface of the planar portion 110 of the primary barrier 100 by an intermittent welding method or by a tech welding method. As such, since the extension part 220 is welded to the inner side of the flat part 110 of the primary barrier 100, after the primary barrier 100 installed inside the primary insulation wall 200 is separately removed, Compared with the conventional installation of the reinforcing material between the primary insulation wall 200 and the primary barrier 100, that is, the pleats 120, the primary barrier 100 does not need to be removed.

However, in the present embodiment, the case in which the reinforcing member 200 is coupled to the primary barrier 100 by a welding coupling method has been described as an example, but this is only an example, and the extension part 220 may be the primary barrier ( Coupled to the planar portion 110 of the 100 may be variously modified.

On the other hand, the reinforcing member 200 may be formed of the same material as the primary barrier (100). Accordingly, the reinforcing member 200 positioned inside the primary barrier 100 may substantially increase the thickness of the primary barrier 100. In other words, the reinforcing member 200 may serve as the primary barrier 100 inside the primary barrier 100, thereby improving the sloshing strength of the primary barrier 100.

In addition, even if the sloshing generated by the rolling, pitching, etc. generated during the operation of the liquefied natural gas carriers apply a large compressive force to the primary barrier 100, the primary barrier 100 is damaged, the primary barrier 100 By installing the reinforcing member 200 inside the) can be quickly and conveniently reinforce the primary barrier (100).

However, in the present embodiment, the case in which the reinforcing member 200 is composed of the curved portion 210 and the extension 220 has been described as an example, but this is only one example, and thus, the spirit of the present invention is limited. It doesn't happen.

Hereinafter, with reference to FIG. 4, the modification of the reinforcement member 200 is demonstrated.

Referring to FIG. 4, the reinforcing member 200 may include a curved portion 210, an extension portion 220, and a connection portion 230. However, since the curved part 210 and the extension part 220 have been described with reference to FIGS. 1 to 3, overlapping descriptions of the curved part 210 and the extension part 220 are omitted, and the connection part 230 will be described below. I will explain mainly.

The connection part 230 may extend from an end of the extension part 220. By the connection part 230, extension parts 220 arranged in different directions may be connected to each other. For example, two extensions 220 disposed adjacently along the first direction (y-axis direction in FIG. 4) and two extensions disposed adjacently along the second direction (x-axis direction in FIG. 4). All of the 220 may be connected by the connection unit 230.

The primary insulation wall 300 is provided on the outer side of the primary barrier 100 and may include a plurality of insulation panels 310. In this case, the bridge panel 400 may be provided between two insulation panels 310 disposed adjacent to each other among the plurality of insulation panels 310.

The secondary barrier 500 is provided on the outer side of the primary heat insulation wall 300, it may form the outer wall surface of the LNG cargo hold (10). In addition, the secondary barrier 500 may have a function of sealing the secondary insulation wall 600 to prevent the material inside the liquefied natural gas cargo hold 10 from penetrating into the secondary insulation wall 600. For example, the secondary barrier 500 may be formed by stacking a triplex of a glass fiber composite material bonded to both sides of an aluminum foil on the secondary insulating wall 600 via an epoxy glue (not shown). have.

The secondary insulating wall 600 is provided on the outside of the secondary barrier 500 and may include a plurality of insulation panels 610 spaced apart from each other.

The flat joint 700 may be filled in the spacer 620. In this case, the flat joint 700 may be made of glass wool as an example.

Hereinafter, a method of manufacturing a LNG cargo hold having the configuration as described above will be described with reference to FIGS. 5 to 8.

5 to 8, first, the secondary heat insulation wall 600 is installed on the inner wall surface of the hull 20. Specifically, the secondary insulation wall 600 may be fixed to the inner wall surface of the hull 20 by the reinforcing plate 40 by the epoxy mastic 30 and the stud bolt (not shown).

In this case, as the plurality of insulation panels 610 constituting the secondary insulation wall 600 are spaced apart from each other, the spaced portion between two insulation panels 610 disposed adjacent to each other among the plurality of insulation panels 610. 620 is formed.

After the secondary insulation wall 600 is installed, a step of installing the secondary barrier 500 on the secondary insulation wall 600 is performed. In this case, the secondary barrier 500 may have a form in close contact with the upper side of the spacer 620 of the secondary insulation wall 600.

When the secondary barrier 500 is installed on the secondary insulation wall 600, the primary insulation wall 300 is installed on the secondary barrier 500. When the installation of the primary insulation wall 300 is completed, the bridge panel 400 is installed between the plurality of insulation panels 310 constituting the primary insulation wall 300.

When the bridge panel 400 is installed between the plurality of insulation panels 310, the primary barrier wall 100 is installed on the primary insulation wall 300 and the bridge panel 400, and two adjacently arranged panels are disposed. For example, the glass wool is filled in the spacer 620 provided between the insulation panels 610 to form a flat joint 700.

Finally, the reinforcing member 200 is installed on the primary barrier 100. Specifically, at least one of at least a portion of the inner side surface of the planar portion 110 of the primary barrier 100, and at least one of the first wrinkle portion 120 and the second wrinkle portion 130 of the primary barrier 100. After manufacturing the reinforcing member 200 having the curved portion 210 and the extension portion 220 to cover the inner surface, it is installed on the primary barrier 100 to install the liquefied natural gas cargo hold 10 To complete.

However, the method of installing the reinforcing member 200 on the primary barrier 100 is not limited thereto. For example, the reinforcing member which may cover the inner surface of the planar portion 110, the first corrugation portion 120, the second corrugation portion 130, and the intersection portion 140 of the primary barrier 100 ( 200).

Next, the portion corresponding to the intersection portion 140 of the primary barrier 100 in the reinforcing member 200 is cut, and the portion corresponding to the portion of the planar portion 110 is cut out.

Finally, the liquefied natural gas is provided by installing the reinforcing member 200 on which the portion corresponding to the intersection portion 140 is cut and the portion corresponding to the portion of the flat portion 110 is cut off on the primary barrier 100. The installation of the cargo hold 10 is completed.

According to the liquefied natural gas cargo hold 10 and the manufacturing method thereof according to the embodiments of the present invention as described above, the reinforcing member 200 of the same material as the material of the primary barrier 100, the primary barrier 100 As installed on the inner side, since the reinforcing member 200 may play a role of increasing the thickness of the primary barrier 100, there is an effect that the sloshing strength of the primary barrier 100 may be increased.

In addition, according to embodiments of the present invention, even if damage occurs in the primary barrier 100 during operation of the liquefied natural gas carrier, by installing the reinforcing member 200 inside the primary barrier 100, the primary barrier There is an effect that can quickly and conveniently reinforce (100).

Although embodiments of the present invention have been described above with reference to the accompanying drawings, those skilled in the art to which the present invention pertains may implement the present invention in other specific forms without changing the technical spirit or essential features thereof. I can understand that. For example, those skilled in the art can change the material, size, etc. of each component according to the application field, or combine or replace the embodiments in a form that is not clearly disclosed in the embodiments of the present invention, but this also It does not depart from the scope of the invention. Therefore, the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and such modified embodiments should be included in the technical spirit described in the claims of the present invention.

10: LNG cargo hold 20: Hull
30: epoxy mastic 40: gusset
100: primary barrier 110: flat portion
120: first wrinkles 130: second wrinkles
140: intersection 200: reinforcing member
210: curved portion 220: extension portion
230: connection portion 300: primary insulation wall
400: bridge panel 500: secondary barrier
600: secondary insulation wall 700: flat joint

Claims (8)

A primary barrier forming a storage space of the liquefied natural gas, the first barrier including a flat part and a first wrinkle part and a second wrinkle part arranged to be connected to and intersect with the plane part; And
A reinforcing member provided inside the primary barrier and in close contact with at least one of the first and second wrinkles,
LNG cargo hold. The method of claim 1,
The reinforcing member,
A curved portion formed to be bent to be in close contact with at least one of the first wrinkle portion and the second wrinkle portion; And
Is formed extending from the curved portion, including an extended portion formed horizontally to be in close contact with the planar portion,
LNG cargo hold. The method of claim 1,
The primary barrier includes an intersection portion formed at a portion where the first wrinkle portion and the second wrinkle portion intersect,
The reinforcing member is disposed except for a portion corresponding to the intersection portion,
LNG cargo hold. The method of claim 2,
The reinforcing member,
Further comprising a connecting portion extending from the end of the extension,
LNG cargo hold. The method according to claim 1 or 4,
The reinforcing member is formed of the same material as the primary barrier,
LNG cargo hold. Installing a secondary insulating wall inside the hull;
Installing a secondary barrier on the secondary insulating wall;
Installing a primary insulating wall on the secondary barrier;
Installing a bridge panel between two insulation panels disposed adjacent to each other among a plurality of insulation panels constituting the primary insulating wall;
Installing a primary barrier on the primary insulating wall and the bridge panel;
Installing a flat joint in a separation portion formed between two insulation panels disposed adjacent to each other among a plurality of insulation panels constituting the secondary insulation wall; And
Installing a reinforcing member on the primary barrier,
Method for producing LNG cargo hold. The method of claim 6,
Installing the reinforcing member,
Fabricating the reinforcing member capable of covering at least a portion of an inner side surface of the planar portion of the primary barrier and at least one inner side surface of at least one of the first corrugation portion and the second corrugation portion of the primary barrier; And
Coupling the reinforcing member on the primary barrier,
Method for producing LNG cargo hold. The method of claim 6,
Installing the reinforcing member,
Fabricating the reinforcing member capable of covering the planar portion, the first wrinkle portion, the second wrinkle portion, and the intersection of the primary barrier as a whole;
Cutting a portion of the reinforcing member corresponding to the intersection;
Cutting a portion of the reinforcing member corresponding to a portion of the planar portion; And
Coupling the reinforcing member on which the portion corresponding to the intersection is cut and the portion corresponding to the portion of the planar portion is cut out on the primary barrier,
Method for producing LNG cargo hold.

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