KR20220063689A - Membrane-type Liquefied Gas Insulation System with Double Metal Barrier Structure - Google Patents

Abstract

An objective of the present invention is to provide a membrane-type liquefied gas insulation system capable of securing better performance than a conventional technique in the aspect of both insulation and airtightness. The membrane-type liquefied gas insulation system of a double metal barrier structure has a double sealing structure in which a secondary insulation layer, a secondary membrane, a primary insulation layer, and a primary membrane are sequentially stacked from an inner wall of a storage container toward the inside of the storage container and comprises: a plurality of secondary insulation panels continuously arranged on the inner wall of the storage container to make up the secondary insulation layer; a plurality of primary insulation panels continuously arranged on the secondary membrane to make up the primary insulation layer; a secondary membrane fixing unit installed on an upper portion of the secondary insulation panels to fix the secondary membrane; a primary membrane fixing unit installed on an upper portion of the primary insulation panels to fix the primary membrane; an insulation layer fixing device fixing the primary insulation panels on an upper portion of the secondary insulation layer; and a spacer arranged in a space vertically created in the insulation system by the installation of at least one among the secondary membrane fixing unit, the primary membrane fixing unit, and the insulation layer fixing device. A compressible elastic surface layer is attached to at least one between the upper and lower surfaces of the spacer.

Description

Membrane-type Liquefied Gas Insulation System with Double Metal Barrier Structure}

The present invention relates to a membrane type liquefied gas insulation system of a double metal barrier structure built inside a liquefied gas cargo hold or fuel tank provided on a liquefied gas carrier or the like.

Natural gas is transported in gaseous form through onshore or offshore gas pipelines or stored in LNG carriers as liquefied natural gas (hereinafter 'LNG') and transported to remote consumers. LNG is obtained by cooling natural gas to a cryogenic temperature (about -163°C), and its volume is reduced to about 1/600 of that of gaseous natural gas, so it is very suitable for long-distance transportation by sea.

In offshore structures for transporting or storing LNG, such as an LNG carrier for loading and unloading LNG to an onshore destination by navigating the sea, a specially designed storage tank (often called a ‘cargo hold’) that can safely store cryogenic LNG for a considerable period of time also called) is installed.

LNG storage tanks can be classified into independent type and membrane type depending on whether the load of cargo acts directly on the insulation. In general, membranous storage tanks have a double sealing structure in which a secondary insulation layer, a secondary barrier, a primary insulation layer, and a primary barrier are sequentially stacked on the inner wall of the hull. There is this.

The NO 96 type storage tank consists of insulation boxes in which the primary and secondary insulating layers are filled with insulating materials such as perlite powder or glass wool inside the plywood box, and each A barrier is formed by installing an invar steel (36% nickel steel) membrane with a thickness of 0.5 to 0.7 mm on the top of the insulation box constituting the insulation layer.

In this NO 96 type storage tank, the primary and secondary barriers have almost the same level of liquid-tightness and strength, so in the event of leakage of the primary barrier, only the secondary barrier can safely support cargo for a considerable period of time, and it is composed of an insulated box. The insulating layer to be used can have high compressive strength and rigidity, and has the advantage of high welding automation rate.

On the other hand, the MARK Ⅲ type storage tank is composed of insulation panels in which the insulation layer is formed by bonding wood plywood to the upper or lower surface of polyurethane foam (PUF), and the upper portion of the primary insulation layer is approximately 1.2 mm thick. A first barrier is formed by installing a stainless steel (SUS) membrane of

This MARK Ⅲ type storage tank has the advantage of excellent insulation effect of insulation panels based on polyurethane foam insulation, but the insulation panel has flexible properties and is vulnerable to thermal deformation or hull deformation. As such, it is difficult to apply an Inba steel membrane with a small coefficient of heat shrinkage. Therefore, in the MARK Ⅲ type storage tank, a stainless steel membrane with corrugated corrugations is applied as the primary barrier to form an insulation system to absorb the deformation of the membrane.

In addition, since the corrugated membrane is not easy to install between the insulating layers disposed on top and bottom due to its structural characteristics (there is a difficulty in construction due to interference between the corrugation of the membrane and the insulating layer), in the current MARK Ⅲ type storage tank, a tree instead of a metal membrane A secondary barrier is constructed using a flex, but this structure has a disadvantage in that the primary and secondary barriers are both vulnerable to airtightness compared to an insulating system made of a metal material.

An object of the present invention is, in a liquefied gas cargo hold or fuel tank provided in a liquefied gas carrier, etc., the primary and secondary insulation layers are composed of insulation panels with excellent thermal insulation performance, and both the primary and secondary barriers are made of metal membranes. By enabling application, it is intended to provide a membrane type liquefied gas insulation system that can secure superior performance compared to the existing ones in terms of both insulation and airtightness.

In addition, the present invention makes it possible to use the insulating panels constituting the primary and secondary insulating layers in the same manner without dividing the insulating layers, thereby greatly improving the workability from the viewpoint of manufacturing and installation, shortening the drying period and reducing the price. Another object of the present invention is to provide a membrane type liquefied gas insulation system that can secure a competitive edge.

In addition, the present invention embodies the structure of the insulation system to enable more flexible and stable behavior against various loads generated inside the liquefied gas cargo hold or fuel tank, so that it has remarkable performance in terms of insulation performance and airtightness as well as structural stability. An object of the present invention is to provide a membrane type liquefied gas insulation system.

According to one aspect of the present invention for achieving the above object, a double sealing structure in which a secondary heat insulating layer, a secondary membrane, a primary heat insulating layer and a primary membrane are sequentially stacked from the inner wall surface of the storage container to the inner direction of the storage container In the membranous liquefied gas insulation system having a plurality of primary heat insulating panels arranged in series on the secondary membrane to constitute the primary heat insulating layer; a secondary membrane fixing part installed on the secondary insulation panel to fix the secondary membrane; a primary membrane fixing part installed on the primary insulation panel to fix the primary membrane; a heat-insulating layer fixing device for fixing the first heat-insulating panel on top of the second heat-insulating layer; and a spacer disposed in a space generated in a vertical direction in the heat insulation system by installing at least one of the secondary membrane fixing part, the primary membrane fixing part, and the heat insulating layer fixing device, wherein the upper surface of the spacer And a membrane-type liquefied gas insulation system of a double metal barrier structure may be provided, characterized in that a compressible elastic surface layer is attached to at least one surface of the lower surface.

The spacer may be made of a composite material reinforced with plywood or glass fiber, and the elastic surface layer may be made of a wool material.

The glass fiber-reinforced composite material may be a glass fiber-reinforced epoxy or glass fiber-reinforced polypropylene material.

The spacer including the elastic surface layer is installed in a compressed state in the space generated in the vertical direction in the insulation system, and the space additionally generated when deformation occurs in the insulation system is filled by the expansion action of the elastic surface layer. can

The spacer including the elastic surface layer may include at least any one of between the secondary insulation panel and the secondary membrane, between the primary insulation panel and the primary membrane, and between the secondary insulation panel and the primary insulation panel It can be placed in a space that occurs in

The spacer including the elastic surface layer is arranged to correspond to the upper surface of the secondary insulating panel or the primary insulating panel, or up to the boundary of the secondary insulating panel adjacent to each other or the primary insulating panel neighboring each other It may be arranged to cover at the same time.

In addition, according to another aspect of the present invention for achieving the above object, a secondary insulating layer, a secondary membrane, a primary insulating layer and a primary membrane are sequentially stacked in the inner direction of the storage vessel from the inner wall surface of the storage vessel. In the membranous liquefied gas thermal insulation system having a sealing structure, by installing a member for fixing the secondary membrane or the primary membrane on the secondary insulating layer or the primary insulating layer or on the upper part of the secondary insulating layer A spacer composed of a composite material reinforced with plywood or glass fiber is placed in a space generated in the vertical direction within the insulation system by the installation of a member for fixing the primary heat insulation layer to support the load, but the spacer By attaching an elastic surface layer of a wool material attached to at least one of the upper and lower surfaces of the A membrane-type liquefied gas insulation system of a double metal barrier structure may be provided.

Membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention applies a metal membrane as both a primary and a secondary barrier to form a seal by welding, thereby providing not only liquid tightness but also perfect gas tightness (gas tightness) ) is possible.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has an advantage in that the insulation layer is composed of an insulation panel based on a polyurethane foam-based insulation material, so that the insulation performance is excellent.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has a structure in which the primary insulation layer and the secondary insulation layer are cross-arranged with each other, and can minimize thermal bridges occurring in the insulation layer, Alternatively, it may have an effect of dispersing/reducing deformation in the thickness direction of the heat insulating layer with respect to various loads generated inside the fuel tank.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention can design the size and processing form of the insulation panel constituting the first insulation layer and the second insulation layer to be completely the same, so that the production, installation and In terms of management, cost reduction is possible.

In addition, the membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention enables a more flexible and stable behavior with respect to various loads generated inside a cargo hold or fuel tank, thereby significantly improving structural stability. .

The effects of the present invention are not limited to the above-described effects, and other effects not mentioned will be clearly understood from the following description.

1 is a perspective view schematically showing the structure of a liquefied gas insulation system according to the present invention.
Figure 2 is a perspective view showing the insulation panel constituting the insulation layer in the liquefied gas insulation system according to the present invention.
3 is a perspective view showing the cross-arranged structure of the primary and secondary thermal insulation layers in the liquefied gas thermal insulation system according to the present invention.
4 is a plan view showing the cross-arranged structure of the primary and secondary thermal insulation layers in the liquefied gas thermal insulation system according to the present invention.
5 is a diagram schematically showing the structure of a liquefied gas insulation system according to the present invention, and is a side cross-sectional view taken along line AA of FIG. 1 .
6 is a side cross-sectional view showing a structure in which the primary insulating layer is fixed on top of the secondary insulating layer in the liquefied gas insulating system according to the present invention.
7 is a perspective view showing a structure in which the secondary barrier is installed on the upper portion of the secondary heat insulating layer in the liquefied gas thermal insulation system according to the present invention.
8 is a plan view showing a state in which the secondary membrane fixing part is installed on the upper part of the secondary insulating layer in the liquefied gas thermal insulation system according to the present invention.
9 is a perspective view showing the secondary strip of the secondary membrane fixing part according to the present invention.
10 is a perspective view showing a modified example of the secondary barrier installation structure according to the present invention.
11 is a perspective view showing a state in which the arm rail strip of the primary membrane fixing part is installed on the upper part of the primary insulating layer in the liquefied gas thermal insulation system according to the present invention.
12 is a plan view showing a state in which the arm rail strip of the primary membrane fixing part is installed on the upper part of the primary insulating layer in the liquefied gas thermal insulation system according to the present invention.
13 is a view showing a primary strip of a primary membrane fixing part according to the present invention, (a) is a perspective view (b) is a cross-sectional view.
14 is a perspective view showing a structure in which the primary barrier is installed on the upper portion of the primary heat insulating layer in the liquefied gas thermal insulation system according to the present invention.
15 is a perspective view showing a modified example of the primary barrier installation structure according to the present invention.
16 is a perspective view showing a spacer installed in the liquefied gas insulation system according to the present invention.
17 is a side view illustrating various modifications of a spacer according to the present invention.
18 is a view for explaining a structure in which a secondary spacer is installed on an upper portion of the secondary heat insulating layer in the liquefied gas insulating system according to the present invention, (a) is a view showing the secondary heat insulating layer before the secondary spacer is installed , (b) shows the secondary insulation layer in which the installation of the secondary spacer is completed.
19 is a view for explaining a structure in which a primary spacer is installed on an upper portion of a primary insulating layer in a liquefied gas thermal insulation system according to the present invention, (a) shows the primary insulating layer before the primary spacer is installed; , (b) shows the primary insulation layer in which the installation of the primary spacer is completed.
20 is a side view showing a structure in which an insulating-type gap insulating material is disposed between secondary insulating panels adjacent to each other in the liquefied gas insulating system according to the present invention.
21 is a view showing various modifications of the insulating gap insulating material according to the present invention.
22 is a side view showing a structure in which a support-type gap insulator is disposed between the primary insulation panels adjacent to each other in the liquefied gas insulation system according to the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings illustrating preferred embodiments of the present invention and the contents described in the accompanying drawings.

In the present specification, liquefied gas is stored at a low temperature such as LPG (Liquefied petroleum gas), LEG (Liquefied Ethane Gas), liquefied ethylene gas, liquefied propylene gas, etc., including the most representative LNG. / It can be transported and can be interpreted as meaning including all of various types of liquefied gas that can be consumed as fuel for engines, etc. in a vaporized state.

In the present invention, the use of the terms 'primary' and 'secondary' refers to whether the primary sealing or insulation function is based on the liquefied gas stored in the storage container (or storage tank) constituting the cargo hold or fuel tank. It is used as a classification standard for whether it functions as a secondary sealing or insulation.

Also, the customarily applied terms 'top' or 'above' refer to the direction toward the inside of the reservoir irrespective of the direction to gravity, likewise the terms 'bottom' or 'down' are related to the direction to gravity. It refers to the direction toward the outside of the storage container without

Hereinafter, the present invention will be described in detail by describing preferred embodiments of the present invention with reference to the accompanying drawings. Like reference numerals in each figure indicate like elements.

According to the present invention, in liquefied gas cargo holds and fuel tanks provided in liquefied gas carriers, etc., the primary and secondary insulating layers are composed of insulating panels with excellent thermal insulation performance, and metal membranes can be applied as both primary and secondary barriers. It is to specify the structure of the insulation system that makes it possible. Hereinafter, the barrier will be described with the term 'membrane' unified.

The structure of the liquefied gas insulation system according to the present invention will be described in detail with reference to FIGS. 1 to 22 . For reference, in the drawings attached to the specification, it is revealed that some components may be excluded from the illustration or the sizes of components may be exaggerated so that the structure of the insulation system can be clearly understood. Specifically, in FIG. 1, the configuration of the secondary membrane 200 and the primary membrane 400 is excluded from the illustration, and in FIGS. 3 and 4, in order to clearly show the structure of the cross arrangement between the heat insulating layers 100 and 300, the heat insulating layer 100 , 300) except for the insulating panels 110 and 310 constituting the other components are excluded.

Referring to the accompanying drawings, the liquefied gas insulation system according to the present invention is a secondary heat insulating layer 100, secondary It has a double sealing structure in which the membrane (Secondary membrane, 200), the primary heat insulating layer 300 and the primary membrane (Primary membrane, 400) are sequentially stacked.

The insulation layers 100 and 300 are the main insulation functions in the present insulation system, that is, to prevent heat intrusion from the outside of the storage container, and are installed between the inner wall surface H of the storage container and the secondary membrane 200 . It may be divided into a double heat insulating layer including the secondary heat insulating layer 100 that is used, and the primary heat insulating layer 300 installed between the secondary membrane 200 and the first membrane 400 .

The heat insulating layers 100 and 300 may be composed of a plurality of heat insulating panels 110 and 310, respectively, and a plurality of heat insulating panels 110 and 310 are disposed on the inner wall surface H of the storage container in the longitudinal and transverse directions. Each of the heat insulating layers 100 and 300 may be formed by being sequentially arranged.

Referring to FIG. 2 , the heat insulation panel 110/310 constituting each heat insulation layer 100 and 300 uses glass fiber reinforced polyurethane foam (R-PUF) as a core material 111/311, and plywood and / Alternatively, it may be manufactured in the form of a sandwich panel using a composite material reinforced with glass fiber as the surface layer portions 112/312. Here, as the 'glass fiber-reinforced composite material', an epoxy in which glass fibers are reinforced as a thermosetting material or polypropylene in which glass fibers are reinforced as a thermoplastic material may be exemplified.

In the insulation panel (110/310), the insulation performance and the load bearing function in the thickness direction of the insulation layers (100, 300) are mainly contributed by the glass fiber reinforced polyurethane foam, which is the core material (111/311). In consideration of the temperature and load conditions applied to the wall, materials suitable for insulation and load support can be selected and selected. can utilize That is, the core material 111/311 of the heat insulation panel 110/310 may be selected as a material corresponding thereto based on the thermal conductivity and mechanical properties of the glass fiber reinforced polyurethane foam.

In addition, as the surface layer parts 112/312 of the heat insulation panel 110/310, not only plywood commonly used in liquefied gas storage technology, but also glass fiber reinforced composite material is selected and used, so that the heat insulation layers 100 and 300 are It is possible to remarkably improve the safety in response to the stress concentration locally acting on the bending rigidity in the in-plane direction and the fixing portion of the heat insulating layer.

In this thermal insulation system, the primary thermal insulation layer 300 and the secondary thermal insulation layer 100 may be cross-arranged with each other for the purpose of minimizing the thermal bridge phenomenon and promoting structural stability. The vertices of the primary insulating panel 310 constituting the primary insulating layer 300 are, as shown in FIGS. 3 and 4 , that the primary insulating layer 300 and the secondary insulating layer 100 are intersected with each other. The position is located in the upper central portion of the secondary thermal insulation panel 110 constituting the secondary thermal insulation layer 100, and the vertex position of the secondary thermal insulation panel 110 is located in the lower central portion of the primary thermal insulation panel 310. means to be placed.

In addition, in the present thermal insulation system, the primary thermal insulation panel 310 and the secondary thermal insulation panel 110 may be manufactured to have the same length, width, and thickness of the panel (the difference is within a maximum of 25%), and most preferably can configure the insulation system so that the length, width, and thickness of the primary insulation panel 310 and the secondary insulation panel 110 are all the same, so that they can be used in common.

That is, in the present insulation system, the insulation panel 110/310 is manufactured in the same manner and in the same size using the core material 111/311 and the surface layer part 112/312 of the same material, so that the secondary insulation layer 100 and the primary insulation layer 100 are used. It can be used in common without distinction of the heat insulating layer 300 .

At this time, in consideration of the temperature and load conditions applied to each wall surface of the storage container constituting the liquefied gas cargo hold or fuel tank, the type or physical properties (density, etc.) of the material constituting the insulation panel 110/310 may be changed. Irrespective of this, the insulating panels 110/310 manufactured in the same way may be commonly used for the primary insulating layer 300 and the secondary insulating layer 100 installed in the same area.

In addition, the shape of the insulation panel 110/310 may be slightly changed at the boundary portion between the corner portion where any one wall surface and the other wall surface of the storage container meet and the adjacent flat portion thereof, but also in the corresponding area with the primary insulation layer 300 and As the insulation panels 110/310 constituting the secondary heat insulation layer 100, a common one may be used.

In the accompanying drawings, the width and length of the heat insulation panel 110/310 are 1:1 ratio, and the cross section of the square shape is presented as an embodiment, but the present invention is not limited thereto. The cross section may be provided in a rectangular shape. However, even in such a case, it would be preferable from the viewpoint of installation such as cross arrangement that the length of the heat insulating panel 110/310 is formed to be an integer multiple of the width.

In addition, in the case of an insulation system having a shape of a double insulation layer divided up and down like this insulation system, if the densities of the upper and lower insulation panels are differently formed, the load is concentrated on the side with the lower density, which may cause a larger deformation. , in the present invention, the size as well as the physical properties of the secondary insulation panel 110 and the primary insulation panel 310 installed in the same area are configured to be the same to prevent the above-mentioned problems from occurring and improve the structural stability of the insulation system can be promoted

On the other hand, in the present invention, the fixing method of the primary insulating panel 310 and the secondary insulating panel 110 is also the same (or almost at a similar level) by using the characteristics of the primary and secondary insulating layers 300 and 100 having the same shape. ), and through this, the primary insulation panel 310 and the secondary insulation panel 110 can be completely identically manufactured not only in the external form but also in the detailed form such as processing for fixing. make it a task

That is, the present invention provides the insulating panel 110/310 implemented in the same way not only in the external scope, such as material and size, but also in the detailed processing form, so that the secondary insulating layer 100 and the primary insulating layer 300 are separated. By completely unifying the constituent members, the installation workability is improved and the effect of cost reduction is sought.

Specifically, the heat insulation panel 110/310 is required to be firmly fixed on the lower structure, and for this purpose, a hole processing for fastening with a fixing member may be made on the heat insulation panel 110/310. . The present invention implements the fixing structure of the secondary heat insulation panel 110 and the first heat insulation panel 310 in the same way, such as hole processing made in the heat insulation panel 110/310 constituting the heat insulation layers 100 and 300, etc. It makes it possible to configure all the detailed machining forms in the same way.

Looking at the installation and fixing structure of each heat insulation layer 100 and 300 , first, the secondary heat insulation panel 110 constituting the second heat insulation layer 100 includes a stud bolt and a resin or mastic. ) can be fixed and supported on the inner wall surface (H) of the storage container using adhesive and load-bearing materials such as.

At this time, the stud bolts provided on the inner wall surface (H) of the storage container fix the four corner portions of the secondary insulation panel 110, and for this purpose, the four corners of the secondary insulation panel 110 have studs of the storage container, respectively. The through hole 114 may be machined so that the bolt may be inserted therethrough.

In the case of the first heat insulation panel 310 constituting the first heat insulation layer 300 , after the second membrane 200 is installed on the second heat insulation layer 100 , the installation is made on the second membrane 200 . However, in the present invention, the fixing structure of the primary insulating panel 310 is implemented in the following way so that the shape of the primary insulating panel 310 can be completely identical to that of the secondary insulating panel 110 .

Referring to FIGS. 1 and 6 , a disk-shaped fixing plate 720 including four studs 721 is installed in the upper center of the secondary insulation panel 110 , and provided on the fixing plate 720 . A corner portion of the primary insulation panel 310 may be fixed by each stud 721 .

Although not specifically shown in the drawings, the stud bolts provided on the inner wall surface (H) of the storage container or the studs 721 provided on the fixing plate 720 are, respectively, the secondary insulation panel 110 and the primary insulation. It is inserted into the through-holes 114 and 314 formed in the corner portion of the panel 310, and members such as washers and nuts are inserted from the upper side of the through-holes 114 and 314 and fastened to the stud member, thereby insulating panels 110 and 310 ) can be fixed.

For reference, the reason that the fixing plate 720 is installed in the upper center of the secondary heat insulation panel 110 is to implement a cross-arranged structure between the first heat insulation layer 300 and the second heat insulation layer 100 as described above.

In addition, the fixing plate 720 may be fastened using a fixing nut 730 on the collar stud 710 installed on the upper portion of the secondary insulation panel 110, and the insulation layer fixing device 700 including these configurations ) structure will be discussed in more detail later.

As described above, in the present thermal insulation system, the primary insulating panel 310 is individually fixed by the studs 721 provided on the corner portions of the fixing plate 720, and therefore the corner portions of the primary insulating panel 310. Also, a through hole 314 having the same shape as the through hole 114 processed in the secondary heat insulating panel 110 may be formed.

That is, in the liquefied gas insulation system according to the present invention, the insulation panels 110/310 constituting the second insulation layer 100 and the first insulation layer 300 have the same size and shape as well as the processing form for fixing completely. It can be designed in the same way, and through this, it is possible to achieve the effect of reducing the cost in terms of manufacturing, installation and management of the heat insulating panel 110/310.

On the other hand, as a prior art, a whole semicircle or fan-shaped groove is cut out and processed in the corner or corner portion of the primary insulation panel, and a technical configuration for fixing the corners or corner portions of adjacent primary insulation panels at the same time is known. there is. According to this prior art, the grooves processed in the corners or corners of the primary insulating panel for fastening with the fixing member occupy a considerable area when viewed as a whole of the primary insulating layer, thereby weakening the load bearing capacity of the insulating layer in the corresponding part, and There was a disadvantage that additional finishing construction for insulation in the empty space had to be done excessively.

However, in this thermal insulation system, since the through-hole 314 is formed in the inner corner of the corner portion of the primary thermal insulation panel 310 while maintaining the angular shape, a more advantageous advantage in terms of the strength maintaining ability of the primary thermal insulation layer 300 can have

In this insulation system, the membranes 200 and 400 are installed on top of each insulation layer 100 and 300 to seal the liquefied gas, and the primary membrane 400 is in direct contact with the cryogenic liquefied gas to provide Sealing is performed, and the secondary membrane 200 performs secondary sealing of the liquefied gas in preparation for occurrence of leakage in the primary membrane 400 . The secondary membrane 200 is designed to support the load of the liquefied gas for a considerable period of time when the primary membrane 400 leaks and to be liquid-tight.

The liquefied gas insulation system according to the present invention is mainly characterized by using a membrane made of a metal material as the primary and secondary membranes 400 and 200 to ensure perfect airtightness of the liquefied gas accommodated therein.

The primary and secondary membranes 400 and 200 may be made of a metal material with strong low-temperature brittleness to cope with stress changes caused by cryogenic liquefied gas, for example, low-temperature steel such as stainless steel, Invar steel, or aluminum alloy is used. can be

Preferably, the primary and secondary membranes 400 and 200 may be configured by using a membrane made of stainless steel or Invar steel, which is a metal that can be used up to cryogenic temperatures, in a corrugated form or a flat plate form.

More preferably, in the present thermal insulation system, the primary and secondary membranes 400 and 200 may be made of a stainless steel membrane, and as shown in FIG. By having it, it is possible to easily absorb the heat shrinkage deformation caused by the cryogenic temperature of the liquefied gas.

The corrugations formed in the membranes 200 and 400 may include longitudinal corrugations formed in the longitudinal direction of the storage container and transverse corrugations formed in a direction perpendicular thereto, and longitudinal corrugations. A plurality of and transverse wrinkles are formed side by side on the membranes 200 and 400, respectively, and may have a lattice shape as a whole. A cross corrugation may be formed at a portion where the bidirectional wrinkles cross each other.

In this thermal insulation system, the wrinkles formed on the primary membrane 400 are formed in a raised shape in the inner direction of the storage container, and the wrinkles formed in the secondary membrane 200 are formed in a raised shape in the inner direction of the storage container. Thus, the direction of the wrinkles formed on the two membranes 200 and 400 may be formed in opposite directions.

Here, the wrinkles formed on the primary membrane 400 are raised in the inner direction of the storage container, and there is no need to discuss whether to interfere with the primary heat insulating layer 300, but in the case of the secondary membrane 200, it is disposed at the bottom Interference with the secondary heat insulating layer 100 may be a problem.

In order to solve this problem, the present invention forms the gap between the wrinkles formed in the secondary membrane 200 to correspond to the width or length of the secondary thermal insulation panel 110 constituting the secondary thermal insulation layer 100, 2 The corrugations of the primary membrane 200 may be disposed within the gap between the secondary insulating panels 110 .

That is, the present insulation system allows the wrinkles formed in the secondary membrane 200 to be naturally accommodated within the gap between the secondary insulation panels 110 adjacent to each other, thereby avoiding interference with the wrinkles of the secondary membrane 200 . No separate processing is required for the secondary heat insulation layer 100 or the first heat insulation layer 300, so the secondary membrane 200 made of a metal material between the second heat insulation layer 100 and the first heat insulation layer 300 is formed in a shape. It has the effect that it can be easily installed without any restrictions (regardless of whether wrinkles are included).

Liquefied gas insulation system according to the present invention, the secondary membrane fixing part 500 for fixing the secondary membrane 200 on the upper portion of the secondary insulation layer 100, and the primary on the upper portion of the primary insulation layer 300 It may include a primary membrane fixing part 600 for fixing the membrane 400 .

In this case, as described above, in this thermal insulation system, both the secondary thermal insulation panel 110 constituting the secondary thermal insulation layer 100 and the primary thermal insulation panel 110 constituting the primary thermal insulation layer 300 can be used as common ones. Since it is a feature of implementing a thermal insulation system so that it is possible, the membrane fixing parts 500 and 600 are attached to the insulation panels 110 and 310 so that additional processing is not required even on the upper surface of each insulation panel 110 , 310 . It can be installed in the form of placing it on top.

That is, in the present insulation system, the membrane fixing units 500 and 600 may be installed in a protruding form on the insulation panels 110 and 310 constituting the insulation layers 100 and 300, and the The space can be supplemented by the arrangement of spacers 120 and 320 to be described later.

However, the present invention is not limited thereto, and as will be described later, the shape or installation position of the secondary strip 510 and the secondary strip fixing member 520 of the secondary membrane fixing unit 500 is different from the primary membrane fixing unit 600 . ) is similar to the arm rail strip 611 and the primary strip fixing member 620, so the upper surfaces of the secondary insulating panel 110 and the primary insulating panel 310 are designed to have the same size of the corresponding components. The same type of processing for installation of the membrane fixing parts 500 and 600 may be performed.

Hereinafter, specific structures of the secondary membrane fixing unit 500 and the primary membrane fixing unit 600 will be sequentially described.

Referring to FIGS. 1 and 7 to 10 , the secondary membrane fixing unit 500 includes a secondary strip 510 disposed over the upper surface of the secondary thermal insulation panel 110 adjacent to each other, and the secondary insulation It may include a secondary strip fixing member 520 installed in the center of the upper surface of the panel 110 to fix the end of the secondary strip 510 .

The secondary strip 510 is a metal plate in the form of a flat band, and may be arranged to extend from the center of the secondary insulating panel 110 to the center of the other neighboring secondary insulating panels 110 . At this time, in order to avoid interference with the lower folds formed in the secondary membrane 200 in the portion positioned at the boundary of the secondary insulation panel 110 adjacent to each other on the secondary strip 510, a 'V' shape is formed. A bending part 511 may be formed.

The secondary strip fixing member 520 may be bonded to the upper surface of the secondary insulation panel 110 and/or fastened in a mechanical manner using screws, rivets, staples, etc., It serves to fix the end of the secondary strip (510).

The secondary strip fixing member 520 may be installed in the center of the upper surface of the secondary insulating panel 110, considering that the central part of the secondary insulating panel 110 undergoes the least deformation due to heat shrinkage. .

The end of the secondary strip 510 may be inserted into a fixing groove formed on the side of the secondary strip fixing member 520 or fixed through welding with the secondary strip fixing member 520 .

When the secondary strip 510 is configured to be inserted into the secondary strip fixing member 520 , a predetermined distance is formed between the fixing groove formed in the secondary strip fixing member 520 and the end of the secondary strip 510 . It is possible to allow some sliding (sliding) of the secondary strip 510 by giving a tolerance of The structural stability of the system may have the effect of further improving.

Only the end of the secondary strip 510 is fixed by the secondary strip fixing member 520 , and the secondary strip 510 may not be separately fixed to the upper surface of the secondary heat insulating panel 110 . This is to configure the insulation system to minimize the portion where the secondary strip 510 receives mechanical force, as will be described later, and to enable the secondary insulation panel 110 and the secondary membrane 200 to move relatively flexible with each other. .

The secondary strip 510 is installed between the secondary insulating panels 110 positioned on the front, back, left and right with respect to any one secondary insulating panel 110 , crossing the center of the secondary insulating panel 110 . It can be arranged in the form, and therefore, when viewed as a whole of the secondary heat insulating layer 100, has a lattice-shaped arrangement structure.

The secondary membrane 200 may be configured by continuously connecting unit membrane sheets 201 as shown in FIG. 7 , and the unit membrane sheet 201 is a lattice formed by a plurality of secondary strips 510 . It is disposed in the space so that the edge portion may be welded onto the secondary strip 510 . In this case, the edges of the adjacent unit membrane sheets 201 may be overlapped and welded to form a seal of the secondary membrane 200 .

On the other hand, in the present insulation system, the secondary strips 510 may be individually detachably provided, and depending on the size of the unit membrane sheet 201 constituting the secondary membrane 200 , the secondary strip 510 may be installed in an unnecessary area. By removing the strip 510, the effect of cost reduction according to the quantity reduction can be further maximized.

For example, referring to FIG. 10 , when the unit membrane sheet 201 having twice the length as compared to that shown in FIG. 7 is installed, 2 of a portion other than the area corresponding to the edge of the unit membrane sheet 201 is provided. It is possible to delete the tea strip 510 .

1 and 11 to 15 , the primary membrane fixing unit 600 includes a primary strip 610 disposed over the upper surface of the primary insulating panel 310 adjacent to each other, and primary insulation It may include a primary strip fixing member 620 installed in the center of the upper surface of the panel 310 to fix the end of the primary strip 610 .

Similar to that described in the secondary membrane fixing unit 500, the primary strip 610 may be arranged to extend from the center of the primary insulating panel 310 to the center of another neighboring primary insulating panel 310, and , the primary strip fixing member 620 may serve to fix the end portion of the primary strip 610 by being bonded and/or mechanically fastened to the upper surface of the primary insulating panel 310 .

In addition, the end portion of the primary strip 610 may be inserted into a fixing groove formed in the primary strip fixing member 620 or fixed through welding with the primary strip fixing member 620, and is fixed in the inserted form. In a similar case, some sliding (sliding) of the primary strip 610 may be allowed.

However, in the case of the primary membrane 400 fixed by the primary membrane fixing part 600 , as it performs a sealing function by direct contact with liquefied gas, the degree of heat shrinkage deformation due to cryogenic temperature is higher than that of the secondary membrane 200 . Since it can be large, in consideration of this, the primary strip 610 in the present insulation system may be provided in the form of a rail rather than a flat plate like the secondary strip 510 .

The primary strip 610 is, as shown in FIG. 13, the end is fixed by the primary strip fixing member 620 and the arm rail strip 611 having an arm rail 611R in the center along the longitudinal direction and , it has an arm rail 611R formed on the arm rail strip 611 and a male and female rail 612R coupled thereto, and may include a wheel strip 612 to which the primary membrane 400 is fixed by welding. .

The arm rail strip 611 is configured to be installed in a position similar to the above-described secondary strip 610, and the end is directly by the primary strip fixing member 620 installed in the center of the upper surface of the primary insulating panel 310. is fixed An arm rail 611R is formed on a center line along the longitudinal direction of the arm rail strip 611 .

In addition, only the end of the arm rail strip 611 is fixed by the primary strip fixing member 620 , and may not be separately fixed to the upper surface of the primary heat insulating panel 310 , and accordingly, the primary strip The thermal insulation system may be configured such that the portion 610 receives a mechanical force is minimized, and the primary insulation panel 310 and the primary membrane 400 are relatively flexible with each other.

The wheel strip 612 is a plate-shaped metal plate having a predetermined area, and provides a portion to which the primary membrane 400 is fixed by welding.

The water rail 612R protruding from the lower surface of the vehicle rail strip 612 may be coupled to the female rail 611R formed in the center line along the longitudinal direction of the female rail strip 611 by male and female coupling. Here, 'male and female coupling' may refer to a form in which the male rail 612R is coupled to the female rail 611R in a fitting manner to be caught and supported by the step structure of the female rail 611R, and thus the vehicle rail strip 612 ) is constrained in the vertical direction, but has a structure in which sliding flow is possible along the longitudinal direction of the arm rail strip 611 .

The water rail strip 612 coupled to one arm rail strip 611 may be configured as a single piece or as a plurality of separate pieces. When a plurality of trailer strips 612 are separately configured, the plurality of truck strips 612 may be fastened along the longitudinal direction of the arm rail strip 611, and each of the rail strips 612 is independently formed. Since the sliding flow is possible, it is possible to more easily respond to the thermal contraction deformation of the primary membrane 400 . The allowable sliding distance may be adjusted by a tolerance provided between the plurality of separate wheel strips 612 .

In addition, the water rail strip 612 may be configured in a form separated according to the wrinkle interval of the primary membrane 400 . That is, the boundary portion between the plurality of track strips 612 may be disposed to correspond to the wrinkle position of the primary membrane 400 , and accordingly, each of the trailer strips 612 is formed of the primary membrane 400 . It can move more effectively in response to wrinkle deformation and can absorb deformation caused by thermal and impact loads. As shown in the figure, when the corrugation interval of the primary membrane 400 is uniform, as well as when the corrugation interval of the primary membrane 400 is non-uniform, the wheel strip 612 is configured according to the corresponding length. can do.

The primary membrane fixing part 600 for fixing the primary membrane 400 as described above is in addition to the sliding (sliding) when the arm rail strip 611 is fixed to the primary strip fixing member 620 in an insertion form. By having a slidable structure of the rail strip 612, there is an effect that a more flexible behavior is possible in response to the deformation of the wrinkles when the thermal contraction of the primary membrane 400 due to the cryogenic temperature occurs.

Similar to the secondary strip 510 , the primary strip 610 may be disposed on the entire primary heat insulating layer 300 in a lattice form, and of the unit membrane sheet 401 constituting the primary membrane 400 . The edge portion may be fixed by welding on the rail strip 612 of the primary strip 610 . In this case, the edges of the adjacent unit membrane sheets 401 may be overlap-welded to form a seal of the primary membrane 400 .

In addition, the primary strip 610 may also be individually detachably provided, and as can be seen with reference to FIGS. 14 and 15 , the size of the unit membrane sheet 401 constituting the primary membrane 400 . Accordingly, in the area where installation is unnecessary, the primary strip 610 may be deleted to reduce the quantity and thus reduce the cost.

On the other hand, since the wrinkles formed on the primary membrane 400 have a raised shape toward the inner direction of the storage container, a bending portion 511 such as the secondary strip 510 is formed on the primary strip 610 . No need.

In addition, in the case of the primary membrane 400 that is located closer to the cryogenic liquefied gas, the degree of heat shrinkage load that must be experienced is greater than that of the secondary membrane 200, so the wrinkles formed in the primary membrane 400 are reduced. The number may be greater than the number of secondary membranes 200 . That is, the interval between the wrinkles of the primary membrane 400 may be formed to be narrower than the interval between the wrinkles of the secondary membrane 200 .

As described above, in the liquefied gas insulation system according to the present invention, the end of the secondary strip 510 of the secondary membrane fixing unit 500 and the primary strip 610 of the primary membrane fixing unit 600 is insulated It is only fixed by the strip fixing parts 520 and 620 installed in the center of the upper surface of the panels 110 and 310, and is not directly fixed to the upper surface of the heat insulating panels 110 and 310, but is provided in a sliding flow form.

In the known prior art, the thermal contraction behavior of the membrane and the insulating panel is subordinated by welding the membrane on an anchor strip mechanically fixed on the insulating panel. Therefore, a slit is processed for the purpose of preventing stress concentration due to heat shrinkage on the insulation panel, and a method of matching the position of the slit with the wrinkle position of the membrane is applied.

On the other hand, in this thermal insulation system, the behavior of the respective thermal insulation layers 100 and 300 and the membranes 200 and 400 installed thereon are not dependent on each other and relatively flexible behavior is possible. The slit processing can be eliminated, and even when the slit is processed, it is not necessary to match the position of the slit with the wrinkle position of the membrane, so it is possible to have the effect that a flexible design of the insulation system is possible.

Hereinafter, with reference to FIG. 6 , the structure of the heat insulating layer fixing device 700 provided on the second heat insulating layer 100 for fixing the first heat insulating layer 300 in the liquefied gas heat insulating system according to the present invention will be looked at in more detail. see.

The insulation layer fixing device 700 includes a collar stud 710 installed in the upper center of the secondary insulation panel 110 , a fixing plate 720 coupled to the upper end of the color stud 710 , and a fixing plate 720 . It may include a fixing nut 730 for fixing the on the collar stud (710).

The collar stud 710 may be fixed to the upper portion of the secondary strip fixing member 520 of the above-described secondary membrane fixing unit 500 , for example, the lower end of the collar stud 710 to the secondary strip fixing member 520 . Fixing may be made in a manner such as screwing with a fastening groove formed thereon.

At this time, a part (vertex portion) of the unit membrane sheet 201 constituting the secondary membrane 200 may be positioned on the secondary strip fixing member 520 , which is formed in the horizontal direction from the collar stud 710 . The wing portion is disposed to cover the secondary membrane 200 positioned on the secondary strip fixing member 520 and welded to the upper surface of the secondary membrane 200 , so that sealing is maintained even in a discontinuous section of the secondary membrane 200 . can be

The fixing plate 720 may be fixed by fastening the fixing nut 730 after being fitted on the protrusion formed in the vertical direction from the collar stud 710 . Accordingly, the fixing plate 720 may include a hole through which the protrusion of the collar stud 710 is inserted into the central portion.

The fixing plate 720 may include four studs 721 protruding upward, and each corner of the primary insulation panel 310 is formed by the four studs 721 formed on the fixing plate 720, respectively. Since it has been described above that it can be fixed, a detailed description thereof will be omitted.

In the above example, the collar stud 710 and the fixing plate 720 are provided as separate members, but the collar stud 710 and the fixing plate 720 may be provided as an integral member. Even in this case, the integral member must be welded to the upper surface of the secondary membrane 200 to be sealed, but the fixing nut 730 can be omitted. In addition, it is of course also possible to provide all of the collar stud 710, the fixing plate 720, and the secondary strip fixing member 520 as an integral member.

On the other hand, provided between the primary insulating layer 300 and the secondary insulating layer 100 by deformation due to various loads occurring inside the storage container constituting the liquefied gas cargo hold or fuel tank, and the application of the double metal barrier structure. Depending on the arrangement of the heat insulating layer fixing device 700 and the membrane fixing units 500 and 600 , a space may be generated inside the heat insulating system.

The present insulation system intends to propose a structure in which the spacers 120 and 320 are arranged in the space so as to fill the space that may occur in the insulation system and to serve as a structural support at the same time as described above.

As the spacers 120 and 320, a composite material reinforced with glass fiber may be used, or it is possible to use a plywood material. Here, the 'composite material reinforced with glass fiber' may include, for example, a composite material such as epoxy reinforced with glass fiber as a thermosetting material or polypropylene reinforced with glass fiber as a thermoplastic material as described above. That is, as the material of the spacers 120 and 320 , a material equivalent to or higher than that of the material constituting the surface layer portions 112/312 of the heat insulating panel 110/310 may be used.

In this thermal insulation system, the spacers 120 and 320 are preferably disposed between the primary thermal insulation layer 300 and the secondary thermal insulation layer 100, more preferably the thermal insulation layer fixing device 700 and the membrane fixing parts 500 and 600 Accordingly, it may be disposed in a space generated between the heat insulating layers 100 and 300 or between the heat insulating layers 100 and 300 and the membranes 200 and 400 .

In particular, as described above, the present insulation system has a structure in which the membrane fixing parts 500 and 600 and the insulation layer fixing device 700 are disposed on the upper surface of the insulation panel 110/310 without separate processing. Therefore, it may be essential to arrange a structure capable of supporting a load in the space generated in the insulation system according to such arrangement.

Referring to FIG. 16 , the spacers 120/320 may be manufactured in the form of a plate having a predetermined thickness to fill the space generated in the vertical direction in the thermal insulation system of the stacked structure.

In addition, as shown in FIG. 17, by attaching a material with high elasticity in the form of wool to either one or both surfaces of the upper and lower surfaces of the spacer 120/320 as the elastic surface layer 121/321, installation During this time, the spacer 120/320 including the elastic surface layer 121/321 is maintained in a compressed state, and when deformation occurs in the insulation system later, between the insulation layers 100 and 300 or between the insulation layers 100 and 300 and the membrane 200 , 400) to be filled by the expansion action of the elastic surface layer (121 / 321), it is possible to minimize the performance loss of the insulation system.

18 and 19, the structure in which the secondary spacer 120 is installed on the upper portion of the secondary heat insulating layer 100 and the structure in which the primary spacer 320 is installed on the upper part of the primary heat insulating layer 300 are respectively shown. there is.

Referring to FIG. 18 , in consideration of the fact that the lower wrinkle of the secondary membrane 200 is accommodated in the boundary between the secondary thermal insulation panels 110 in the secondary thermal insulation layer 100 , the boundary portion of the secondary thermal insulation panel 110 is The secondary spacer 120 may be installed in the excluded region. That is, the secondary spacer 120 installed on the secondary heat insulating layer 100 is the remaining area except for the installation area of the secondary membrane fixing part 500 and the insulating layer fixing device 700 on the secondary insulating panel 110 . It can be installed to correspond to

Although the thickness of the secondary spacer 120 is the same as that of the secondary strip 510 of the secondary membrane fixing part 500 in the drawing, as shown in FIG. Of course, when an additional space is further generated between the secondary strip 510 and the primary insulation panel 310, the thickness of the secondary spacer 120 may be formed to be thicker so as to fill all of the space.

Referring to FIG. 19 , since the primary membrane 400 installed on the top of the primary heat insulating layer 300 has wrinkles toward the inside of the storage container, it is necessary to leave a boundary between the primary insulating panels 310 . there is no Accordingly, the primary spacers 320 installed on the primary insulating layer 300 may be disposed to simultaneously cover the adjacent primary insulating panels 310 .

However, the installation structures of the spacers 120 and 320 shown in FIGS. 18 and 19 are not limited to the secondary insulating layer 100 and the primary insulating layer 300, respectively, and may be selectively applied to each insulating layer as necessary. Of course you can. That is, if necessary, the installation structure of the spacer 120 shown in FIG. 18 may be applied to the primary heat insulating layer 300 side, as well as the installation structure of the spacer 320 shown in FIG. 19 is the secondary heat insulating layer 100 . ) can also be applied to the side.

According to the structure of the present invention in which the spacers 120/320 made of a material equivalent to or higher than the surface layer portions 112/312 of the heat insulation panel 110/310 as described above are disposed in the space generated on the thermal insulation system of the laminate type. , it has the effect of increasing the structural safety of the insulation system by performing a supporting role for various load conditions experienced by the insulation system.

In addition, since the present invention can supplement the space generated within the insulation system by arranging the spacers 120/320, as described above, the membrane fixing unit is not separately processed on the insulation panel 110/310. (500, 600) and the installation of the heat insulating layer fixing device 700 is easy, so that additional processing is not required for the heat insulating panel (110/310) and the heat insulating layer (100, 300) is perfectly the same form of insulation without distinction In that it is possible to use the panels 110/310, the advantages in terms of manufacturing, installation and management of the insulation system can be further maximized.

On the other hand, in the present insulation system, between the insulation panels 110 and 310 constituting the insulation layers 100 and 300, the installation space of the insulation layer fixing device 700, the wrinkle accommodation space of the secondary membrane 400, installation tolerance, etc. The arrangement is made with a predetermined gap in consideration. Since such a gap is a factor that may cause heat loss due to convection, a gap insulation is usually disposed in the space between the adjacent insulation panels 110 and 310 for the purpose of preventing heat loss. That is, if the above-described spacers 120/320 are filled in the space generated in the vertical direction in the thermal insulation system of the stacked structure, the gap insulating material is filled in the space generated in the horizontal direction in the thermal insulation system.

The present invention provides two types of gap insulators (800, 900) according to whether a load bearing function is required for the space generated between the insulating panels (110, 310).

First, referring to FIGS. 20 and 21 , the boundary between the secondary insulating panels 110 constituting the secondary thermal insulation layer 100 is a space in which the folds of the secondary membrane 200, which is an upper structure thereof, are accommodated, and the secondary The need to have a load-bearing function for the membrane 200 is not great.

That is, in the gap between the secondary insulating panels 110, the heat insulating function rather than the load bearing function is the top priority, so the present invention arranges the insulating gap insulating material 800 between the secondary insulating panels 110 adjacent to each other. Insulation system can be configured to do this.

The insulating-type gap insulator 800 may be configured by combining the foam-type core 810 and the elastic material 820 with high elasticity, or may be configured as a single elastic material 820, and 2 adjacent to each other in a compressed state. It may be inserted into the space between the car insulation panels 110 . At this time, a membrane (film, etc.) may be attached to the elastic material 820 to limit or prevent ventilation of the material itself.

When the insulating gap insulating material 800 is composed of a combination of the foam-type core material 810 and the elastic material 820, the elastic material 820 may be provided in a form surrounding the outer surface of the core material 810. , As shown in (a) of FIG. 21, the elastic material 820 surrounds all of the upper and lower surfaces and all four sides of the core 810, and as shown in FIG. 21 (b), the elastic material 820 is the core material. The upper and lower surfaces of the core 810 are all open by surrounding only the four sides of the 810 , and the elastic material 820 surrounds the upper and four sides of the core 810 as shown in FIG. 21 ( c ). , or as shown in (d) of FIG. 21 , the elastic material 820 may be provided in any one of the forms surrounding the lower surface and four sides of the core material 810 . In addition, when the insulating gap insulating material 800 is disposed in the space between the secondary insulating panels 110, as shown in FIG. The height of the 810 is reduced and the upper end of the elastic material 820 may be provided in a form including an inclined surface.

In the above, it has been described as a preferred embodiment that the heat-insulating gap insulator 800 is disposed between the secondary heat-insulating panels 110, but this is an example of a preferred arrangement position of the heat-insulating gap insulator 800. However, the arrangement position of the insulating gap insulating material 800 is not necessarily limited thereto. When the gap space generated in the insulation system does not require a load-bearing function, for example, when it is built on the side or upper surface of the storage container, the insulation-type gap insulation 800 is also provided in the space between the primary insulation panels 310. batch can be applied.

Insulation-type gap insulator 800 is a method of compressing and inserting materials with relatively high elasticity into the space between the insulation layers. 820), it is possible to minimize heat loss through the space by filling the space additionally generated by the expansion action.

Next, referring to FIG. 22 , at the boundary between the primary insulating panels 310 constituting the primary insulating layer 300 , there is a possibility that a flat part of the primary membrane 400 , which is an upper structure thereof, is located, and such In this case, there is a need to have a load-bearing function for the primary membrane 400 .

That is, when the flat portion of the primary membrane 400 is disposed above the gap between the primary insulation panels 310, it is structurally advantageous to have a load bearing function as well as a thermal insulation function, so the present invention provides a method for adjacent 1 The insulation system may be configured to dispose the support-type gap insulation 900 between the car insulation panels 310 .

The support-type gap insulator 900 has a core material 910 made of a material equivalent to or higher than glass fiber reinforced polyurethane foam, which is the core material 111/311 of the insulation panel 110/310 with mechanical properties, in the central portion, and the side portion thereof It may be configured by combining an elastic material 920 with a high degree of elasticity capable of being compressed, and may be inserted into the space between the adjacent primary heat insulating panels 310 in a compressed state. In this case, a film (film, etc.) may be attached to the elastic material 920 to limit or prevent ventilation of the material itself.

In the above, it has been described as a preferred embodiment that the support-type gap insulator 900 is disposed between the primary insulation panels 310, but this presents an embodiment for the preferred arrangement position of the support-type gap insulator 900 However, the arrangement position of the support-type gap insulator 00 is not necessarily limited thereto. In this insulation system, the support-type gap insulation 900 can be applied to any area that requires a load bearing function as well as the space between the primary insulation panels 310, for example, the secondary membrane 200 is corrugated. In the case of being composed of a flat membrane without a gap, the support-type gap insulator 900 may be disposed even between the secondary insulation panels 110 .

In addition, it has been described above that the above-described insulating-type gap insulating material 800 can be disposed between the primary insulating panels 310 in an area that does not require a load-bearing function (eg, the side or upper surface of the storage container). , even when the corrugations of the primary membrane 400 are disposed on the upper part of the gap between the primary insulating panels 310 , the insulating gap insulating material 800 may be applied.

That is, in the present thermal insulation system, the arrangement position of the insulating type gap insulating material 800 and the supporting type gap insulating material 900 is not determined by whether the primary insulating layer 300 or the secondary insulating layer 100 is a load bearing function. It can be said that it depends on whether or not this is necessary.

The support-type gap insulator 900 is a method of compressing and inserting a core material 910 with relatively high mechanical properties (strength, etc.) and an elastic material 920 with high elasticity into the space between the insulation layers, and functions as a structural member. The core material 910 not only enables a load bearing function for the upper structure in the space between the heat insulation layers, but also expands the elastic material 920 even if an additional space is generated between the heat insulation layers due to deformation of the panel due to various loads such as heat shrinkage. Heat loss through the space can be minimized by filling the space additionally generated by the

Membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention applies a metal membrane as both a primary and a secondary barrier to form a seal by welding, thereby providing not only liquid tightness but also perfect gas tightness (gas tightness) ) is possible.

In addition, the membrane-type liquefied gas insulation system of the double metal barrier structure according to the present invention has an advantage in that the insulation layer is composed of an insulation panel based on a polyurethane foam-based insulation material, so that the insulation performance is excellent.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention has a structure in which the primary insulation layer and the secondary insulation layer are cross-arranged with each other, and can minimize thermal bridges occurring in the insulation layer, Alternatively, it may have an effect of dispersing/reducing deformation in the thickness direction of the heat insulating layer with respect to various loads generated inside the fuel tank.

In addition, the membrane type liquefied gas insulation system of the double metal barrier structure according to the present invention makes it possible to design the size and processing form of the insulation panel constituting the first insulation layer and the second insulation layer to be exactly the same, so that production, installation and In terms of management, cost reduction is possible.

In addition, the membrane type liquefied gas insulation system having a double metal barrier structure according to the present invention enables a more flexible and stable behavior with respect to various loads generated inside a cargo hold or fuel tank, thereby significantly improving structural stability. .

The present invention is not limited to the described embodiments, and it is apparent to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, it should be said that such modifications or variations belong to the claims of the present invention.

100: secondary insulation layer
110: secondary insulation panel
111: heartwood
112: surface layer
120: secondary spacer
200: secondary barrier
300: primary insulation layer
310: primary insulation panel
311: heartwood
312: surface layer
320: primary spacer
400: primary barrier
500: secondary membrane fixing part
510: secondary strip
511: bending unit
520: secondary strip fixing member
600: primary membrane fixing part
610: secondary strip
611: arm rail strip
612: wagon strip
620: secondary strip fixing member
700: insulation layer fixing device
710: collar stud
720: fixed plate
721: stud
730: fixing nut
800: adiabatic gap insulation
810: heartwood
820: elastic material
900: supported gap insulation
910: heartwood
920: elastic material

Claims (7)

In the membrane type liquefied gas insulation system having a double sealing structure in which a secondary insulating layer, a secondary membrane, a primary insulating layer and a primary membrane are sequentially stacked in an inner direction of the storage vessel from the inner wall surface of the storage vessel,
a plurality of secondary heat insulating panels disposed continuously on the inner wall surface of the storage container to constitute the second heat insulating layer;
a plurality of primary heat insulating panels arranged in series on the secondary membrane to constitute the primary heat insulating layer;
a secondary membrane fixing part installed on the secondary insulation panel to fix the secondary membrane;
a primary membrane fixing part installed on the primary insulation panel to fix the primary membrane;
a heat-insulating layer fixing device for fixing the first heat-insulating panel on top of the second heat-insulating layer; and
and a spacer disposed in a space generated in the vertical direction in the insulation system by installing at least one of the secondary membrane fixing part, the primary membrane fixing part, and the heat insulating layer fixing device,
At least one of the upper and lower surfaces of the spacer is characterized in that a compressible elastic surface layer is attached,
Membrane type liquefied gas insulation system with double metal barrier structure. The method according to claim 1,
The spacer is provided with a composite material reinforced with plywood or glass fiber,
The elastic surface layer is characterized in that provided with a wool (wool) material,
Membrane type liquefied gas insulation system with double metal barrier structure. 3. The method according to claim 2,
The glass fiber-reinforced composite material, characterized in that the glass fiber-reinforced epoxy or glass fiber-reinforced polypropylene material,
Membrane type liquefied gas insulation system with double metal barrier structure. 3. The method according to claim 2,
The spacer including the elastic surface layer is installed in a compressed state in the space generated in the vertical direction in the insulation system,
The space additionally generated when deformation occurs in the insulation system is filled by the expansion action of the elastic surface layer,
Membrane type liquefied gas insulation system with double metal barrier structure. 5. The method according to claim 4,
The spacer including the elastic surface layer may include at least any one of between the secondary insulation panel and the secondary membrane, between the primary insulation panel and the primary membrane, and between the secondary insulation panel and the primary insulation panel characterized in that it is disposed in the space occurring in
Membrane type liquefied gas insulation system with double metal barrier structure. 6. The method of claim 5,
The spacer including the elastic surface layer is arranged to correspond to the upper surface of the secondary insulating panel or the primary insulating panel, or up to the boundary of the secondary insulating panel adjacent to each other or the primary insulating panel neighboring each other Characterized in that it is arranged to cover at the same time,
Membrane type liquefied gas insulation system with double metal barrier structure. In the membrane type liquefied gas insulation system having a double sealing structure in which a secondary insulating layer, a secondary membrane, a primary insulating layer and a primary membrane are sequentially stacked in an inner direction of the storage vessel from the inner wall surface of the storage vessel,
By installing a member for fixing the secondary membrane or the primary membrane on the secondary heat insulating layer or the first insulating layer, or by installing a member for fixing the primary insulating layer on top of the secondary insulating layer By disposing a spacer composed of a composite material reinforced with plywood or glass fiber in the space generated in the vertical direction within the insulation system by
By attaching an elastic surface layer made of a wool material attached to at least one of the upper and lower surfaces of the spacer, the space additionally generated when deformation occurs in the insulation system is filled by the expansion action of the elastic surface layer. characterized in that
Membrane type liquefied gas insulation system with double metal barrier structure.

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