KR20190143711A - Lng cargo and method for manufacturing same - Google Patents

Abstract

The present invention relates to a liquefied natural gas cargo hold. Specifically, according to one embodiment of the present invention, provided is a liquefied natural gas cargo hold, which includes: a plurality of corner insulation panels having a curved shape, arranged in a row, and spaced apart by a predetermined interval; and a reinforcing panel provided on an inner surface of the plurality of corner insulation panels, wherein the reinforcing panel is formed with a penetration hole communicating with a spaced space formed between two adjacent corner insulation panels of the plurality of corner insulation panels.

Description

Liquefied natural gas cargo hold and its manufacturing method {LNG CARGO AND METHOD FOR MANUFACTURING SAME}

The present invention relates to an anchor strip and a liquefied natural gas cargo hold including the same.

In general, liquefied natural gas (LNG) is a fossil fuel mainly composed of methane and containing a small amount of ethane, propane, and the like, 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, efficient transportation methods for transporting liquefied natural gas in large quantities from the production site to the demand site have been continuously studied. As one of several transportation methods, liquefied natural gas is liquefied. Liquefied natural gas carriers have been developed to transport large quantities.

On the other hand, such a liquefied natural gas carrier is provided with a cargo hold (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 (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.

The membrane type cargo hold is provided with an insulating layer on the outside and the inside. In the flat part, the inner heat insulating layer can be easily fixed by fixing means such as studs and bolts. However, due to the spatial narrowness of the corner portion and the vicinity thereof, the inner heat insulating layer cannot be fixed with studs, bolts, etc., and other fixing means such as a slide member must be used, and space for operating the fixing means is required. In addition, the inner heat insulating layer at the corner portion should be provided with a reinforcing material to withstand the sloshing load, the reinforcing material is to be fixed after the heat insulating panel installation of the inner heat insulating layer in order to secure the space required for the operation and installation of the fixing means. However, attaching the reinforcing material after the insulation panel is installed takes too much manpower and time as compared with installing the reinforcing material in advance after attaching it to the insulation panel.

Embodiments of the present invention have been invented to solve the above-described problem, the wall of the liquefied natural gas cargo hold and its manufacture that can reduce the manpower and time required to construct the reinforcement and insulation panels in the corner portion of the liquefied natural gas cargo hold and To provide a method.

According to an aspect of the present invention, a corner insulation panel having a curved shape and provided in plurality and arranged in a line but spaced at predetermined intervals; And a reinforcement panel provided on an inner side surface of the plurality of corner insulation panels, wherein the reinforcement panel is formed with a through hole communicating with a separation space formed between any two adjacent corner insulation panels of the plurality of corner insulation panels. A liquefied natural gas cargo hold may be provided.

In addition, the through hole may be provided with a liquefied natural gas cargo hold formed inwardly from the edge of the reinforcement panel.

In addition, a flat insulation panel disposed adjacent the corner insulation panel and having a flat shape; And fixing means installed on the barrier to fix the flat insulation panel, wherein the through hole is provided on one side of the fixing means so that the fixing means can be adjusted while the reinforcing panel is installed on the corner insulation panel. A liquefied natural gas cargo hold may be provided.

In addition, the flat insulation panel includes a bottom panel portion disposed on the outer insulation layer side to be fixed by the fixing means, the fixing means is configured to be slidable to the flat insulation panel side to press the bottom panel portion liquefied natural A gas hold may be provided.

In addition, a liquefied natural gas cargo hold may be provided further comprising a membrane sheet installed on the reinforcement panel to cover the through hole.

In addition, the two corner insulation panels liquefied natural comprising a first corner insulation panel having three or more sides extending in different directions, and a second corner insulation panel having two or more sides extending in different directions A gas hold may be provided.

In addition, the reinforcing panel is installed on the inner surface, the corner insulation panel preparation step of preparing a plurality of corner insulation panels having a curved shape at a predetermined angle; A corner insulation panel installation step of arranging the plurality of corner insulation panels in a line but spaced at a predetermined interval; And a corner insulation panel fixing step of fixing the plurality of corner insulation panels to an inner insulation layer or a barrier sheet, wherein the reinforcement panel has a separation space formed between any two adjacent corner insulation panels of the plurality of corner insulation panels. There may be provided a method of manufacturing a liquefied natural gas cargo hold is formed through the communication hole.

In addition, the through hole may be provided with a method for producing a liquefied natural gas cargo hold formed inwardly from the edge of the reinforcement panel.

In addition, the flat insulation panel arrangement step of placing the flat insulation panel on the reinforcement panel adjacent to the corner insulation panel; And a flat thermal insulation panel fixing step of fixing the flat thermal insulation panel by inserting a tool through the through hole.

The flat insulation panel fixing step may further include: a fixing means operating step of moving the fixing means such that the fixing means provided on the barrier presses the bottom panel portion disposed on the outer heat insulating layer side of the flat insulation panel; And the tool is inserted through the through-hole can be provided a method for producing a liquefied natural gas cargo hold comprising a step of tightening the fixing means for tightening the fixing means installed on the barrier.

In addition, the method of manufacturing a liquefied natural gas cargo hold further comprises a membrane sheet fixing step of fixing the membrane sheet covering the through hole on the reinforcing panel after the flat insulation panel is fixed.

According to the embodiment of the present invention, there is an effect that the reinforcement and the insulation panel can be installed at the corner of the liquefied natural gas cargo hold with a small manpower and a short time.

1 is a perspective view of a wall of a liquefied natural gas cargo hold according to an embodiment of the present invention.
2 is a perspective view of the membrane sheet separated from the wall of the liquefied natural gas cargo hold of FIG.
3 is an exploded perspective view of a wall of the liquefied natural gas cargo hold of FIG.
4 is a plan view illustrating a through hole of the reinforcement panel of FIG. 2.
FIG. 5 is a perspective view from the opposite side of which the fixing means of FIG. 2 fixes the flat thermal insulation panel. FIG.
6 is a flowchart illustrating a method of manufacturing a liquefied natural gas cargo hold of FIG.

Hereinafter, specific embodiments for implementing the spirit of the present invention will be described in detail with reference to the accompanying drawings.

In addition, in describing the present invention, when it is determined that the detailed description of the related well-known configuration or function may obscure the gist of the present invention, the detailed description thereof will be omitted.

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.

The liquefied natural gas cargo hold may be installed in the hull of the hull, and has an accommodation space for accommodating liquefied natural gas therein. The wall 2 of the liquefied natural gas cargo hold includes an outer reinforcement panel 10, an outer insulation layer 20, a barrier sheet 30, an inner insulation layer 40, a fixing means 43, an auxiliary panel 51, and a reinforcement panel ( 52, and membrane sheet 70. The outer reinforcement panel 10, the outer insulation layer 20, the inner insulation layer 40, the auxiliary panel 51, the reinforcement panel 52, the anchor strip 60, and the membrane sheet 70 may be sequentially stacked. .

The outer reinforcement panel 10 may support the outer heat insulating layer 20 to prevent the outer heat insulating layer 20 from being deformed due to heat shrinkage and expansion. The outer reinforcement panel 10 may be formed of a material such as plywood.

The outer insulation layer 20 may insulate the liquefied natural gas from the outside to maintain the liquefied natural gas in an ultra low temperature state. The outer insulation layer 20 may be disposed between the outer reinforcement panel 10 and the barrier sheet 30 and may be fixed to the upper surface of the outer reinforcement panel 10 through a stud bolt or the like. The outer heat insulation layer 20 may be provided in plurality and spaced apart from each other. The outer insulation layer 20 may be made of a lightweight material with excellent insulation performance, such as polyurethane foam (PUF) or reinforced polyurethane foam (Reinforced PUF; R-PUF).

The barrier sheet 30 may function as a preliminary means for preventing the leakage of liquefied natural gas. The barrier sheet 30 may be installed between the outer heat insulating layer 20 and the inner heat insulating layer 40. The barrier sheet 30 may be made of, for example, a metal material such as INVAR, stainless steel, or aluminum alloy, or may be made of rigid triplex and supple triplex. Can be.

The inner insulation layer 40 may insulate the liquefied natural gas from the outside to maintain the liquefied natural gas in an ultra low temperature state. The inner insulation layer 40 may be disposed between the barrier sheet 30 and the auxiliary panel 51, and may be fixed to the outer insulation layer 20 or the upper surface of the barrier sheet 30. The inner insulation layer 40 may be made of a lightweight material with excellent insulation performance, such as polyurethane foam (PUF) or reinforced polyurethane foam (Reinforced PUF; R-PUF).

The inner insulation layer 40 may include a corner insulation panel 41 and a flat insulation panel 42 disposed at the corners of the cargo hold.

The corner insulation panel 41 may have a curved shape corresponding to the shape of the corner portion of the liquefied natural gas cargo hold. The corner insulation panel 41 may be assembled with the reinforcement panel 52 before being installed in the outer insulation layer 20 or the barrier sheet 30 to constitute one panel module. The corner insulation panel 41 is fastened to the outer insulation layer 20 or the barrier sheet 30 by a fixing means such as a bolt penetrating the corner insulation panel 41 and the reinforcement panel 52 while being engaged with the reinforcement panel 52. Can be installed. In addition, the corner insulation panel 41 may be provided in plurality, and may be arranged in a line. In the present specification, being arranged in a line is not necessarily limited to being arranged in a straight line, and may include arranged to be bent or bent. Of these, the adjacent corner insulation panels 41 may be spaced apart from each other at predetermined intervals. An insertion insulator (not shown) having a shape corresponding to the spaced space may be provided to be embedded in the spaced space.

The corner insulation panel 41 includes a first corner insulation panel 41a having three or more faces extending in different directions and a second corner insulation panel 41b having two or more faces extending in different directions. can do. For example, the first corner insulation panel 41a may be a three-sided panel having three sides extending in different directions or a four-sided panel having four sides extending in different directions. In addition, the second corner insulation panel 41b may be a two-sided panel having two surfaces, a horizontal surface and a vertical surface, or a three-sided panel having three surfaces extending in different directions. Before the first corner insulation panel 41a and the second corner insulation panel 41b are fixed to the outer insulation layer 20 or the barrier sheet 30, the reinforcement panel 52 is formed of the first corner insulation panel 41a and the first corner insulation panel 41a. It may be installed on the upper surface of the two-corner insulation panel 41b.

The flat insulation panel 42 may have a flat shape to cover the flat portion of the liquefied natural gas cargo hold, and may be installed on the outer insulation layer 20 or the barrier sheet 30. In addition, the flat insulation panel 42 may be disposed adjacent to the corner insulation panel 41. The flat insulation panel 42 may include a bottom panel portion 42a disposed on the outer insulation layer 20 side. The flat thermal insulation panel 42 arranged adjacent to the corner thermal insulation panel 41 can be fixed by the fixing means 43 which will be described later by pressing the bottom panel portion 42a.

The fixing means 43 may be disposed in the spaced space between the adjacent corner insulation panels 41 and may be installed in the barrier sheet 30, and may be configured to be movable toward the flat insulation panel 42.

The fixing means 43 may include a fixing body 43a and a fastening member 43b. The fixed body 43a may be formed as an elongate member extending in one direction, and the cross section may have a U shape. In addition, the fixing body 43a may be configured to be selectively movable in one direction. Therefore, the fixing body 43a may be installed to be positioned between the corner insulation panels 41 before the flat insulation panels 42 are installed, and slide toward the bottom panel portion 42a of the flat insulation panels 42. I can move it. To this end, a slide hole 43a-1 may be formed in the fixed body 43a, and the slide hole 43a-1 may be formed to extend in the direction in which the fixed body 43a extends.

The tightening member 43b serves to fix the fixing body 43a so as not to move. The fastening member 43b may include a bolt inserted through the slide hole 43a-1 and a nut engaged with the bolt. The tightening member 43b may be fixed to the outer heat insulating layer 20 or the barrier sheet 30.

The auxiliary panel 51 may be installed on the inner side of the inner heat insulating layer 40 to support the inner heat insulating layer 40. In this specification, the inner side is defined as the side facing the inner space side where the liquefied natural gas is accommodated in the liquefied natural gas cargo hold. The auxiliary panel 51 may prevent the inner heat insulating layer 40 from being deformed by shrinkage and expansion due to heat. The auxiliary panel 51 may be formed of a material such as plywood. The auxiliary panel 51 may be attached to the inner heat insulating layer 40 using an adhesive such as epoxy glue.

The reinforcement panel 52 may be disposed on an inner side surface of at least one of the plurality of corner insulation panels 41, and may be provided in plurality. In addition, the reinforcement panel 52 may have a shape corresponding to the top surface of the corner insulation panel 41. Since the reinforcement panel 52 is provided at the corner of the liquefied natural gas cargo hold, it is possible to stably withstand the load generated due to the slewing (sloshing) of the liquefied natural gas accommodated in the liquefied natural gas cargo hold. To this end, the reinforcement panel 52 may have a thickness of 6 mm or more and 10 mm or less. In addition, the reinforcement panel 52 may be made of a metal material such as INVAR, stainless steel, or aluminum alloy, or may be made of rigid triplex and supple triplex. Can be.

The reinforcement panel 52 may be configured to extend from the inner side of the corner insulation panel 41 to partially cover the space formed between the plurality of corner insulation panels 41. In addition, the reinforcing panel 52 may be formed with a through hole 52a which may communicate with a space formed between the plurality of corner insulation panels 41. The through hole 52a may have a shape such as a groove drawn inwardly from an edge of the reinforcing panel 52. The through hole 52a may be formed in at least some of the plurality of corner insulation panels 41.

The through hole 52a may be formed at a position corresponding to the fixing means 43 so that the fixing fixing means 43 can be adjusted while the reinforcing panel 52 is installed in the corner insulation panel 41. Therefore, the fixing means 43 may be exposed through the through hole 52a when viewed from the inner space side of the liquefied natural gas cargo hold. For example, the through hole 52a may be formed at a position corresponding to the fastening member 43b of the fixing means 43. In addition, the through hole 52a may be formed to a size such that a fixed tool such as a torque wrench or a manipulation tool such as a ring can be inserted therein.

The membrane sheet 70 may form an inner wall of the liquefied natural gas cargo hold, and primarily insulates the liquefied natural gas cargo hold and blocks its outflow. The membrane sheet 70 may be disposed on an inner side surface of the reinforcing panel 52 to cover the through hole 52a.

The membrane sheet 70 is exposed to rapid contraction and expansion because it is in direct contact with the cryogenic storage fluid. Accordingly, it is necessary to prevent fatigue accumulation and breakage of the membrane sheet 70 while repeated thermal contraction and thermal expansion, and to prevent damage to the welded portion of the membrane sheet 70 and deterioration of airtightness during thermal contraction. Therefore, the membrane sheet 70 may be made of a metal material such as Invar alloy (INVAR), stainless steel (SUS), or aluminum alloy so as to maintain physical and chemical states even in an ultra low temperature state. In addition, the membrane sheet 70 may include a flat portion 71 and a pleat portion 72 disposed alternately with each other. The pleats 72 may reduce the thermal stress and the in-plane stiffness of the welded portion by elastically deforming the shape corresponding to the thermal stress applied to the membrane sheet 70.

The membrane sheet 70 may include wrinkles arranged in different directions. Thermal stress acting in the in-plane direction of the membrane sheet 70 may be solved by wrinkles formed in different directions.

On the other hand, since the liquefied gas cargo hold is very large, the insulation structure including the membrane sheet 70 is made through the operation of arranging tens of thousands in a unit box and connecting each other. Accordingly, the membrane sheet 70 may be closely attached to each other in a state where the adjacent membrane sheet 70 and the edge portion overlap each other, and may be welded and installed on the inner heat insulation layer 40 or the reinforcement panel 52 on the auxiliary panel 51. have.

Referring to Figure 6 will be described the construction method of the wall 2 of the LNG cargo hold according to an embodiment of the present invention.

Referring to FIG. 6, first, the outer reinforcement panel 10, the outer heat insulation layer 20, and the barrier sheet 30 may be installed on the hull of the hull. At this time, the outer reinforcing panel 10, the outer heat insulating layer 20, and the barrier sheet 30 can be laminated sequentially (outer heat insulating portion installation step (S100)). The fixing means 43 can be provided on the barrier sheet 30 (fixing means installation step S200).

Thereafter, the inner heat insulating layer 40 is installed on the barrier sheet 30 (inner heat insulating layer installing step S300). The inner insulation layer installation step S300 may include installing a corner insulation panel 41 and installing a flat insulation panel 42.

In order to install the corner insulation panel 41, the corner insulation panel 41 with the reinforcement panel 52 installed on the inner side can be prepared (corner insulation panel preparation step S310). In other words, the reinforcement panel 52 may be fixed to the corner insulation panel 41 before the corner insulation panel 41 is installed and fixed to the outer insulation layer 20 or the barrier sheet 30, and the corner insulation panel 41 may be fixed. ) And the reinforcement panel 52 may be provided as one panel module.

When the corner insulation panel 41 and the reinforcement panel 52 are prepared in a state where they are coupled to each other, the corner insulation panel 41 is disposed at the corner of the cargo hold to be installed, and the corner insulation panel 41 is secured by a bolt or the like. ) Is fixed (corner insulation panel fixing step (S320)). The corner insulation panel 41 and the reinforcement panel 52 may be provided with holes for inserting fixing means such as bolts.

When the corner insulation panel 41 is fixed, the flat insulation panel 42 is installed adjacent to the corner insulation panel 41. To this end, first, the flat insulation panel 42 is disposed adjacent to the corner insulation panel 41 that is already fixed (flat insulation panel arrangement step S330). Thereafter, the tool is inserted through the through hole 52a to fix the flat insulation panel 42 by manipulating the fixing means 43 (flat insulation panel fixing step S340).

The flat insulation panel fixing step S340 includes a fixing means operating step S341 for manipulating the fixing means 43 to move and a tightening means tightening step S342 for tightening the fixing means 43 not to move. After placing the flat insulation panel 42 in the position to be installed, in the fixing means operating step S341, the fixing body 43a, which was positioned between the corner insulation panels 41 before the flat insulation panel 42 is installed, is penetrated. The tool is inserted into the hole 52a and moved. The fixing body 43a is slid to the bottom panel portion 42a side of the flat insulation panel 42, and the nut of the fixing means 43 is tightened. The fixed body 43a can be fixed by being pressed to the bottom by a nut. In this case, the fixing body 43a may fix the flat insulation panel 42 by pressing the bottom panel portion 42a toward the outer insulation layer 20 side.

Thereafter, the membrane sheet 70 is installed on the upper surface of the reinforcing panel 52. The membrane sheet 70 may cover the through hole 52a.

On the other hand, while the embodiments of the present invention have been described as specific embodiments, which are only examples, the present invention is not limited thereto, and should be construed as having the broadest scope in accordance with the basic idea disclosed herein. Those skilled in the art can combine / substitute the disclosed embodiments to implement a pattern of a timeless shape, but this also does not depart from the scope of the present invention. In addition, those skilled in the art can easily change or modify the disclosed embodiments based on the present specification, it is apparent that such changes or modifications belong to the scope of the present invention.

2: liquefied natural gas cargo hold
10: outer reinforcement panel 20: outer insulation layer
30: barrier sheet 40: inner heat insulating layer
41: corner insulation panel 41a: first corner insulation panel
41b: second corner insulation panel 42: flat insulation panel
42a: bottom panel portion 43: fixing means
43a: fixed body 43a-1: slide hole
43b: tightening member 51: auxiliary panel
52: reinforcing panel 52a: through hole
70: membrane sheet

Claims (11)

A corner insulation panel having a curved shape and provided in plurality and arranged in a row, spaced at predetermined intervals; And
A reinforcement panel provided on an inner side surface of the plurality of corner insulation panels,
The reinforcement panel is a liquefied natural gas cargo hold formed with a through-hole communicating with the separation space formed between any two adjacent corner insulation panels of the plurality of corner insulation panels. The method of claim 1,
The through-hole is a liquefied natural gas cargo hold formed inward from the edge of the reinforcement panel. The method of claim 1,
A flat thermal insulation panel disposed adjacent the corner thermal insulation panel and having a flat shape; And
A fixing means installed on the barrier sheet or the outer insulation layer to fix the flat insulation panel,
The through hole is a liquefied natural gas cargo hold formed in a position corresponding to the fixing means so that the fixing means can be adjusted in a state where the reinforcing panel is installed in the corner insulation panel. The method of claim 3, wherein
The flat insulation panel includes a bottom panel portion provided on the outer heat insulation layer side to be fixed by the fixing means,
The holding means is a liquefied natural gas cargo hold configured to be slidable to the flat insulation panel side to selectively press the bottom panel portion. The method of claim 1,
Liquefied natural gas cargo hold further comprises a membrane sheet installed on the inner surface of the reinforcement panel to cover the through hole. The method of claim 1,
The two corner insulation panels
A first corner insulation panel having three or more faces extending in different directions, and
A liquefied natural gas cargo hold comprising a second corner insulation panel having two or more faces extending in different directions. A corner insulation panel preparation step of providing a plurality of corner insulation panels having a reinforcement panel installed on an inner side and having a curved shape at a predetermined angle;
A corner insulation panel installation step of arranging the plurality of corner insulation panels in a line but spaced at a predetermined interval; And
And a corner insulation panel fixing step of fixing the plurality of corner insulation panels to an inner insulation layer or a barrier sheet.
The reinforcement panel is a method of manufacturing a liquefied natural gas cargo hold is formed with a through-hole communicating with the separation space formed between any two adjacent corner insulation panels of the plurality of corner insulation panels. The method of claim 7, wherein
The through-hole is formed in the liquefied natural gas cargo hold formed inward from the edge of the reinforcement panel. The method of claim 7, wherein
Placing a flat insulation panel in the reinforcement panel adjacent to the corner insulation panel; And
And a flat insulating panel fixing step of fixing the flat insulating panel by inserting a tool through the through hole. The method of claim 9,
The flat insulation panel fixing step,
A fixing means operating step of moving the fixing means such that the fixing means provided on the barrier presses the bottom panel portion disposed on the outer heat insulating layer side of the flat insulation panel; And
The tool inserted into the through-hole is a manufacturing method of a liquefied natural gas cargo hold comprising the step of tightening the fixing means for tightening the fixing means installed on the barrier. The method of claim 7, wherein
And a membrane sheet fixing step of fixing the membrane sheet covering the through hole on the reinforcing panel after the flat insulation panel is fixed.

Images