KR20170053774A - Insulation maintaining system for lng cargo - Google Patents

Abstract

Disclosed is a heat insulation performance maintenance system for a liquefied gas holding window. A heat insulating performance holding system of a liquefied gas holding window according to the present invention is a system for holding a heat insulating performance of a liquefied gas holding window according to the present invention comprising a main body wall for preventing leakage of a liquefied gas and a closed type Characterized in that said specific foaming gas comprising a thermal insulation panel assembly and having a thermal conductivity lower than that of nitrogen gas is filled in said sealed thermal insulation panel assembly.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to a liquefied gas

The present invention relates to a system for maintaining a heat insulating performance of a liquefied gas holding window and a liquefied gas holding window using the same. More particularly, the present invention relates to a system for maintaining a heat insulating performance of a liquefied gas holding window having a two-layer structure and a liquefied gas holding window using the same.

Liquefied gas is a liquid made by cooling or compressing gas, and consumption of liquefied gas such as Liquefied Natural Gas (LPG) or LPG (Liquefied Petroleum Gas) is rapidly increasing worldwide.

Liquefied natural gas (LNG), which is an example of liquefied gas, refers to a colorless transparent cryogenic liquid having a volume of methane-based natural gas cooled to -162 ° C and reducing its volume by one-sixth, In order to utilize natural gas as energy, efficient transportation methods have been examined that can be mass-shipped from the production base to the destination of the demand site. As part of this effort, a liquefied natural gas transport vessel capable of transporting large volumes of liquefied natural gas to sea was developed.

The liquefied natural gas transportation vessel must have a cargo which can store and store the liquefied natural gas liquefied at a cryogenic temperature.

That is, since the liquefied natural gas has a higher vapor pressure than the atmospheric pressure and has a boiling temperature of about -162 ° C, in order to safely store and store such liquefied natural gas, For example, it should be made of aluminum steel, stainless steel, 35% nickel steel, etc. It should be designed with a unique insulation panel structure which is resistant to thermal stress and heat shrinkage and prevents heat penetration. Such a cargo hold of a liquefied natural gas transportation vessel can be divided into a self-supporting type and a membrane type depending on its structure. Among them, Korean Patent Laid-Open Publication No. 10-2012-0013233 Feb. 14, 2012) discloses a liquefied natural gas storage tank and a method of manufacturing the same.

This membrane-type liquefied natural gas storage tank is an efficient means of transporting liquefied natural gas. However, the use frequency of the liquefied natural gas storage tank increases with the number of blades. However, the insulation performance of the liquefied gas storage system is deteriorated over time.

This is because the foamed gas which is trapped in the insulation performance maintenance system of the liquefied gas holding window is replaced with the air having a relatively low thermal insulation performance over time (due to the concentration difference of the inside / outside of the cell) Efforts continue to address these problems.

Korean Published Patent Application No. 10-2012-0013233 (2012.02.14.)

DISCLOSURE OF THE INVENTION The present invention has been made in order to solve the above problems, and it is an object of the present invention to provide a system for maintaining a heat insulating performance of a liquefied gas holding cargo with no deterioration in heat insulating performance over time and a liquefied gas holding cargo using the same. have.

According to one aspect of the present invention, there is provided a hermetic adiabatic panel assembly comprising a kitchen wall for preventing leakage of liquefied gas, and a heat insulating panel provided between the inner wall of the hull and the kitchen wall, And the specific foam gas having a thermal conductivity lower than that of the nitrogen gas is filled in the inside of the sealed heat insulating panel assembly.

The closed heat insulating panel assembly may further include a foam gas supply unit for supplying the specific foam gas to the inside of the closed heat insulating panel assembly so that the sealed heat insulating panel assembly maintains a predetermined pressure.

The specific foam gas may include any one of CO 2, Cyclopentane, HBA-2, HCFC-141b and HFC-245fa.

The foam gas supply part may include a gas reservoir for generating the specific foam gas or storing the specific foam gas, and a gas supply part for supplying the specific foam gas supplied from the gas reservoir to the insulation panel assembly .

The system for maintaining the heat insulation performance of the liquefied gas storage cage according to the present invention can reduce the substitution phenomenon of the internal gas due to the elapse of time by filling the insulation panel assembly with the foaming gas to maintain the excellent heat insulation performance for a long time There are advantages to be able to.

Further, by filling the insulating panel assembly with the foaming gas, it is possible to prepare for the risk of fire and explosion due to leakage of liquefied gas as cargo.

Figure 1 shows the thermal conductivity of some foaming gas used in a thermal insulation panel assembly of a closed configuration.
Fig. 2 shows a change with time in the heat insulation performance of a heat insulating panel assembly of a closed structure.
3 is a side cross-sectional view of a liquefied gas holding window including an adiabatic performance holding system of a liquefied gas hold according to an embodiment of the present invention.

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

The embodiments described below are provided by way of example so that those skilled in the art will be able to fully understand the spirit of the present invention. The present invention is not limited to the embodiments described below and may be embodied in other forms. In order to clearly explain the present invention, parts not related to the description are omitted from the drawings, and the width, length, thickness, etc. of the components may be exaggerated for convenience. Like reference numerals designate like elements throughout the specification.

The system for maintaining the adiabatic performance of a liquefied gas hold according to an embodiment of the present invention and the liquefied gas hold using the same are used for storing and / or transporting a cryogenic liquefied gas. The liquefied gas is made of liquid by cooling or compressing the gas, and includes liquefied natural gas (LNG), liquefied petroleum gas (LPG), dimethyl ether (DME) and the like .

A system for maintaining the insulation performance of a liquefied gas hold and a liquefied gas holding window using the same are provided with a carrier carrying liquefied gas such as an LNG carrier, an LNG RV (Regasification Vessel) carrier, an LPG carrier or an ethylene carrier, Unit, Floating Production Storage Offloading (FPSO), or Barge Mounted Power Plant (BMPP), or to a marine floating facility with vaporization facilities. The system for maintaining the heat insulating performance of a liquefied gas holding window and the liquefied gas holding window using the same also include those used for facilities for storing or producing liquefied gas installed on the land as well as facilities installed on the sea.

Hereinafter, a system for maintaining a heat insulating performance of a liquefied gas holding window and a holding type membrane of a liquefied gas holding window using the same will be described as an example.

Fig. 1 shows the thermal conductivity of some foaming gas used in a thermal insulation panel assembly of a hermetic structure, and Fig. 2 shows a change with time in the thermal insulation performance of the hermetically sealed thermal insulation panel assembly.

Referring to FIGS. 1 and 2, a heat insulating panel of a closed cell according to an embodiment of the present invention includes a foamed gas having excellent heat insulation performance inside a single heat insulating panel assembly, cell structure of the heat insulating panel.

In other words, the heat-insulating panel assembly according to an embodiment of the present invention uses foaming gas having excellent heat insulation performance such as CO2, Cyclopentane, HBA-2, HCFC-141b and HFC-245fa, There is a big difference in the insulation performance compared with the method using oxygen.

However, the heat insulating panel assemblies of the closed cells have a characteristic that the heat insulating performance deteriorates with time. This is because the foaming gas, which is trapped in the closed insulation panel assembly and has relatively good thermal insulation performance, is replaced with air having a relatively poor thermal insulation performance over time. This is due to the difference in gas concentration inside and outside the insulation panel assembly.

That is, a closed-panel heat insulating panel assembly is excellent in heat insulation performance but has a characteristic that its performance is lowered with time, and this phenomenon is referred to as aging or aging. PUF (Polyurethane Foam) and R-PUF (Reinforced Polyurethane Foam with Glass fiber), which are used as insulation panels for liquefied gas storage holders, also have such aging characteristics.

When the heat insulating performance of the liquefied gas holding window is deteriorated due to the aging characteristics, the amount of heat input into the liquefied gas holding window increases, and the amount of the evaporated gas generated increases, thereby causing a problem of increasing the loss of the LNG. Hereinafter, the heat insulating performance maintenance system according to an embodiment of the present invention and each configuration of the liquefied gas holding window including the same will be described in detail with reference to the heat insulating characteristics of the foam gas.

3 is a side cross-sectional view of a liquefied gas holding window including an adiabatic performance holding system of a liquefied gas hold according to an embodiment of the present invention.

Referring to the drawings, a liquefied gas holding window in which an adiabatic performance holding system according to an embodiment of the present invention is used includes a kitchen wall 400 surrounding a space capable of accommodating liquefied gas and in direct contact with liquefied gas, A heat insulating panel assembly 100, 300 surrounding the wall 400 to heat the liquefied gas from the outside and an outer wall 10 surrounding and firmly supporting the heat insulating panel assembly 100, 300. Hereinafter, each of the components constituting the liquefied gas holding window will be described in detail.

First, the kitchen wall 400 serves to seal the storage space in which the storage fluid is received. The kitchen wall 400 for this purpose requires airtightness (or watertightness). The damage to the cargo holds a significant amount of time and money in repairs, so the airtightness of the barrier is considered very important.

Here, the above-mentioned airtightness is required because of the pressure change inside the cargo hold caused by vaporization of the liquefied gas. Since the liquefied gas can be kept at a cryogenic temperature below the boiling point, it is usually stored in a liquid state. Depending on the temperature or the pressure, the pressure inside the cargo hold is greatly increased by vaporization of a part of the liquefied gas. The liquid or gaseous liquefied gas flows into the heat insulating panel assemblies 100 and 300 to be described later, thereby damaging the heat insulating panel assembly.

Such a kitchen wall 400 can be made of a metal material such as an invar alloy (INVAR), stainless steel (SUS), or an aluminum alloy so as to maintain its physical and chemical state even at a very low temperature. At this time, the kitchen wall 400 may be formed by connecting a plurality of sheets of the kitchen wall 400 and may be welded to each other to maintain airtightness.

As a method of welding the kitchen wall 400, various welding methods used in the related art can be used and include lap welding or butt welding. An automatic welding apparatus using laser welding or plasma welding may also be used to improve uniformity of work quality while improving welding quality. Above-mentioned lap welding, butt welding, laser welding, plasma welding, etc. are well known in the related art, so a detailed description will be omitted.

Also, since the kitchen wall 400 is in direct contact with the cryogenic storage fluid, it is exposed to abrupt contraction and expansion. The kitchen wall 400 may be damaged due to accumulation of fatigue due to repeated heat shrinkage and thermal expansion, or breakage of the welded portion when heat shrinkage occurs. Because of this problem, the kitchen wall 400 includes a kitchen wall corrugation 410 to have low in-plane stiffness. The kitchen wall corrugation 410 reduces the thermal stress at the welded portion by resiliently deforming the shape corresponding to the thermal stress.

The kitchen wall 400 includes first and second wrinkles 411 and 412 arranged in different directions and an intersection (not shown) where the two kitchen wall wrinkles 410 intersect with each other . The thermal stress acting in the in-plane direction of the kitchen wall 400 can be resolved by the two-directional kitchen wall corrugations 410. That is, the thermal stress acting in the longitudinal direction of the first wrinkled portion 411 is eliminated by the stretchability of the second wrinkled portion 412, and the thermal stress acting in the longitudinal direction of the second wrinkled portion 412 is And is relieved by the stretchability of the wrinkled portion 411.

Next, the heat insulating panel assemblies 100 and 300 include the heat insulating panel assemblies 100 and 300 installed on the flat surface portion and the heat insulating panel assemblies (not shown) installed on the corner portions. The corner portion connects the flat portions disposed at different angles and includes a corner portion to which two different heat insulating panels are connected and a vertex portion to which three different heat insulating panels are connected. Hereinafter, the heat insulating panel assemblies 100 and 300 installed on the flat surface will be described as a basis.

The heat insulating panels 110 and 310 can be generally made of a material having excellent heat insulation performance and light weight such as a polyurethane foam (PUF) or a reinforced polyurethane foam (R-PUF, Reinforced PUF) It can be kept at an ultra-low temperature state by being insulated from the outside. The heat insulation panel assembly is generally made of a double insulation structure including an upper insulation panel 310 and a lower insulation panel 110 for the purpose of improving heat insulation performance and ease of repair.

An inner hull can be used for the outer wall 10 and supports the load of the storage fluid. And the lower insulating panel 110 may be fixed to the outer wall 10.

The lower first reinforcing panel 120 may be coupled to the bottom surface of the lower insulating panel 110 so as to be firmly fixed to the outer wall 10. The lower first reinforcing panel 120 may be formed of plywood or the like and may be attached to the bottom of the lower insulating panel 110 using an adhesive such as an epoxy glue or the like.

The lower insulating panel 110 may be fixed to the outer wall 10 via a lower first reinforcing panel 120 adhered to the bottom surface. The outer wall 10 may be welded with a stud bolt (not shown) for coupling the lower heat insulating panel 110.

A mastic 11 having an adhesive force and / or a level pad 12 for adjusting a level difference may be interposed between the lower first reinforcing panel 120 and the outer wall 10. In particular, since the mastic 11 has both adhesive force and elasticity, it is possible to combine the outer wall 10 and the lower heat insulating panel 110 and mitigate impact transmitted to each other.

The plurality of lower insulating panels 110 may be disposed adjacent to each other, and may be arranged in a grid pattern, for example. Being arranged in a lattice shape means that the lower insulating panels 110 are arranged not only adjacent to each other in the first direction but also adjacent to each other in the second direction.

The gap insulator 140 can be inserted between the adjacent lower insulating panels 110. [ The crevice insulation 140 may be a thermal insulation material capable of filling a gap between the lower thermal insulation panels 110, and a glass wool or the like may be used. The gap insulating material 140 may be inserted after the lower insulating panel 110 is installed or attached to the side of the lower insulating panel 110.

A lower second reinforcing panel 130 may be coupled to an upper portion of the lower insulating panel 110 so as to fix the auxiliary barrier 200 to be described later. The lower second reinforcing panel 130 may be made of plywood or the like and may be attached to the upper surface of the lower heat insulating panel 110 using an adhesive such as epoxy glue. The auxiliary barrier 200 may be connected to the auxiliary barrier fixing member 160 by welding or the like and fixed to the lower second reinforcement panel 130.

The heat insulating panel assembly 100, 300 may include an auxiliary barrier 200 interposed between the upper insulating panel 310 and the lower insulating panel 110. The auxiliary barrier 200 protects the lower insulation panel 110 when the kitchen wall 400 is infiltrated, thereby greatly reducing the time and cost required for the repair.

The auxiliary barrier 200 may be formed of a metal material such as an INVAR, stainless steel or an aluminum alloy as in the case of the kitchen wall 400 or a rigid triplex and a support triple triplex) can be used.

The adhesive type manufacturing method and the welding type manufacturing method are used in accordance with the difference in the method of connecting the auxiliary barrier 200 to the lower insulating panel 110. [ Although not shown in the drawing, in the adhesive type manufacturing method, a rigid triplex is attached by using an adhesive such as an epoxy glue on the lower heat insulating panel 110, and the adjacent rigid triplex is connected by a support triplex, State can be completed. At this time, the shuffle triplex may also be attached to the rigid triplex by an adhesive.

A liquefied gas holding window according to an embodiment of the present invention uses a welded fabrication method in which adjacent auxiliary walls 200 are joined by welding. The welding method is such that the auxiliary barrier 200 is mechanically coupled instead of bonding to the lower insulating panel 110 and the upper insulating panel 310 is also bonded to the lower insulating panel 110 110).

The secondary barrier 200 may include a secondary corrugation 210 to have an in-plane stiffness. The auxiliary barrier ribs 210 are elastically deformed in shape corresponding to thermal stresses, thereby reducing thermal stress at the welded portion. The auxiliary barrier ribs 210 may be formed by a press method or the like.

The auxiliary barrier 200 includes a first wrinkle portion and a second wrinkle portion arranged in different directions and an intersection portion (not shown) where the two auxiliary barrier wrinkle portions 210 intersect with each other. The thermal stress acting in the in-plane direction of the auxiliary barrier 200 can be relieved by the auxiliary barrier ribs 210 in the two directions. That is, the thermal stress acting in the longitudinal direction of the first wrinkle part is canceled by the elasticity of the second wrinkle part, and the thermal stress acting in the longitudinal direction of the second wrinkle part can be solved by the stretchability of the first wrinkle part.

The auxiliary barrier ribs 210 provided in the auxiliary barrier 200 may be convex downward toward the lower insulating panel 110. [ At this time, the lower second reinforcing panel 130 is formed with grooves for receiving the auxiliary barrier ribs 210 of the auxiliary barrier 200, so that interference with the auxiliary barrier ribs 210 can be avoided. The groove may be formed on the upper surface of the lower second reinforcing panel 130 or may be formed to penetrate the lower second reinforcing panel 130.

The auxiliary barrier 200 sheet may be provided to extend over a plurality of lower insulating panels 110. The meaning of being laid across the lower insulating panel 110 includes the case of completely covering and the case of covering only partly.

The auxiliary barrier 200 may be fixed to the auxiliary barrier fixing member 160 provided on the upper portion of the lower insulating panel 110. Particularly, when the lower second reinforcing panel 130 is provided, the auxiliary barrier fixing member 160 can be coupled to the lower second reinforcing panel 130. The auxiliary barrier fixing member 160 may be mechanically coupled to the lower second reinforcing panel 130 by a rivet or the like and may be formed of a metal such as SUS and welded to the auxiliary barrier 200. The auxiliary barrier fixing member 160 may be received in the fixing member coupling groove 130b formed in the lower second reinforcing panel 130 and may not protrude from the upper surface of the lower second reinforcing panel 130. [

In addition, the auxiliary barrier fixing member 160 may be provided in a strip shape and may be arranged in different directions to form an intersection. For example, two strips orthogonal to each other. The auxiliary barrier fixing member 160 may be disposed parallel to the edge of the lower heat insulating panel 110. [ In addition, the auxiliary barrier fixing member 160 may be provided as one strip or may be provided such that a plurality of strips are continuously connected.

The plurality of auxiliary barrier fastening members 160 can form one closed figure by connecting adjacent auxiliary barrier fastening members 160 (including being connected by a virtual extension line without being directly connected).

One auxiliary barrier 200 sheet constituting the auxiliary barrier 200 may have a shape corresponding to the shape of the closed figure formed by the auxiliary barrier fixing member 160. [ The corners of the sheets of the auxiliary barrier 200 can be arranged and fixed so as to overlap the auxiliary barrier fixing member 160, respectively. For example, the sheet of auxiliary barrier 200 may be fixed to the auxiliary barrier fixing member 160 in a tack welding manner.

Next, a process of installing the auxiliary barrier 200 after the lower insulating panel 110 is installed will be described.

The auxiliary barrier 200 may be formed by fixing one auxiliary barrier 200 sheet and then fixing another auxiliary barrier 200 sheet on one adjacent side. At this time, at least one corner of the edge of the auxiliary barrier 200 sheet adjacent to the previously installed auxiliary barrier 200 sheet is disposed to overlap with the sheet of the auxiliary barrier 200 previously provided and the other edge is disposed on the auxiliary barrier fixing member 160 As shown in FIG. For example, the fixing of the auxiliary barrier 200 sheet and the auxiliary barrier 200 sheet and the fixing of the auxiliary barrier 200 sheet and the auxiliary barrier fixing member 160 can be performed using a tack welding method.

The above installation process is continuously performed to fix all the sheets of the auxiliary barrier 200 on the lower insulating panel 110. However, since it is still in the state of being available to be contacted between adjacent auxiliary barrier 200 sheets, it is necessary to perform the main welding in order to maintain airtightness.

Both edges of the sheets of the auxiliary barrier 200 adjacent to each other are welded by lap welding or butt welding, thereby ensuring airtightness. As the welding method which can be used at this time, various welding methods used in the related art can be used. An automatic welding apparatus using laser welding or plasma welding may also be used to improve uniformity of work quality while improving welding quality. Above-mentioned lap welding, butt welding, laser welding, plasma welding, etc. are well known in the related art, so a detailed description will be omitted.

On the other hand, the auxiliary barrier fixing member 160 is positioned below the welding line (or welding seam) when the adjacent auxiliary barrier 200 sheets are welded together, thereby preventing deformation of the auxiliary barrier 200 sheet due to welding heat . It is possible to prevent deformation of the auxiliary barrier 200 sheet, which may be caused by high temperature, particularly when plasma welding is used. At this time, the welding heat is transferred to the auxiliary barrier fixing member 160 during the overlap welding or the butt welding between the auxiliary barrier 200 sheets, so that the auxiliary barrier fixing member 160 and the auxiliary barrier 200, The sheets may be welded together.

The main welding of the auxiliary barrier 200 sheet and the auxiliary barrier sheet 200 can be performed using an automatic welding apparatus. In particular, welding of the corrugated portion of the auxiliary barrier 200 can also be performed using an automatic welding apparatus. In this case, in order to manually weld the auxiliary barrier 200 sheet and the auxiliary barrier 200 sheet by welding, or to use the automatic welding apparatus, Fit-Up. In particular, the use of automatic welding equipment is important to the work of the foot.

Up work may be performed by a fit-up zig (not shown) fixedly installed on the lower insulating panel 110. [ The pick-up jig can be coupled to the stud bolt protruding on the secondary barrier fixing member 160 or fixed on the secondary barrier 200 sheet by a suction type.

The operator can press the sheet of the auxiliary barrier 200 covering the upper side or the sheet of the auxiliary barrier 200 to close the sheet by using the pullup jig. At this time, in order to lift up the auxiliary barrier 200 sheet laid below, an adsorption method and an adhesion method can be used.

Next, the foam gas supply unit 500 will be described. The foam gas supplier 500 serves to enable a specific foam gas used for manufacturing the heat insulating panels 110 and 310 to be supplied to the heat insulating panel assemblies 100 and 300. The foam gas supplier 500 includes a gas supply unit 510 and a gas reservoir 520. As shown in FIG. 1, the specific foam gas may be any one of CO 2, Cyclopentane, HBA-2, HCFC-141b and HFC-245fa having an adiabatic performance higher than that of air.

The gas reservoir 520 and the gas supply source 510 of the foam gas supplier 500 store specific foam gas used for manufacturing the heat insulating panels 110 and 310 and heat the stored specific foam gas to the heat insulating panel assemblies 100 and 300 ). The gas supply station 510 is connected to the first gas supply station 511 and the second gas supply station 512 so as to appropriately distribute the specific foam gas to the upper heat insulating panel assembly 300 and the lower heat insulating panel assembly 100, Two can be provided separately.

The gas supply unit 510 and the gas reservoir 520 may be installed on the deck of the ship to easily supply the specific foam gas to the heat insulating panel assemblies 100 and 300.

As described above, each configuration of the system for maintaining the heat insulating performance of the liquefied gas holding window according to the embodiment of the present invention has been described. Hereinafter, characteristics of such an insulation performance maintenance system will be described.

The liquefied gas holding window having the above-described structure and the adiabatic performance holding system can be largely divided into two spaces. IBS space S1 and IS space S2. The heat insulating panels 110 and 310 provided in the IBS space S1 and the IS space S2 have aging characteristics as described above. Here, the space between the primary barrier and the secondary barrier is referred to as Interbarrier Space (IBS, S1), and the space between the secondary barrier and the inner hull is referred to as an Insulation Space (IS, S2).

That is, when the heat insulating panels 110 and 310 are installed in the IBS space S1 and the IS space S2 of the liquefied gas holding window, the heat insulating panels 110 and 310 are exposed to the surrounding air such as nitrogen gas and the like. 100, 300 are replaced with air or the like due to the difference in concentration, the heat insulating performance is lowered.

Therefore, the heat insulation performance maintenance system of the liquefied gas holding window according to the embodiment of the present invention is characterized in that the insulation panels 110 and 310, that is, the foaming gas used for foaming / manufacturing the PUF or R-PUF in the IBS space S1 and the IS space S2 To prevent a change with time of the heat insulating panels (110, 310).

When the IBS space (S1) and the IS space (S2) are filled with the foaming gas, the foaming gas having better heat insulating performance than the nitrogen gas fills the two spaces while preventing the change with time, .

In order to accomplish this, the closed thermal insulation panel assembly 100, 300 may further include a foam gas supply unit 500 for supplying the specific foam gas into the sealed thermal insulation panel assembly 100, 300, so that the closed thermal insulation panel assembly 100, .

In addition, since the IBS space S1 and the IS space S2 are filled with the specific foaming gas, the risk of fire and explosion due to leakage of the liquefied gas as a cargo can be secured.

While the present invention has been particularly shown and described with reference to exemplary embodiments thereof, it is clearly understood that the same is by way of illustration and example only and is not to be taken by way of limitation, You will understand. Accordingly, the true scope of the invention should be determined only by the appended claims.

S1: IBS space S2: IS space
10: outer wall 100: lower insulation panel assembly
110: lower insulation panel 120: lower first reinforcing panel
130: lower second reinforcing panel 140: crevice insulation
160: auxiliary barrier fixing member 200: auxiliary barrier
210: auxiliary barrier rib 300: upper insulation panel assembly
310: upper insulating panel 320: upper first reinforcing panel
330: upper second reinforcing panel 400:
410: Kitchen wall corrugation part 411: First corrugated part
412: second wrinkle part 500: foam gas providing part
510: gas supply station

Claims (4)

A kitchen wall for preventing leakage of the liquefied gas,
A sealed thermal insulation panel assembly disposed between the kitchen wall and the inner wall of the hull and having a heat insulating panel made of a specific foaming gas,
Wherein said specific foam gas having a thermal conductivity lower than that of nitrogen gas is filled in said sealed heat insulating panel assembly. The method according to claim 1,
Further comprising a foaming gas supply unit for supplying the specific foaming gas into the inside of the sealed thermal insulation panel assembly,
Wherein the sealed thermal insulation panel assembly maintains a constant pressure. 3. The method according to claim 1 or 2,
The specific foaming gas
CO2, Cyclopentane, HBA-2, HCFC-141b, and HFC-245fa. 3. The method of claim 2,
The foam gas supply part
A gas reservoir for generating the specific foam gas or storing the specific foam gas,
And a gas supply unit for supplying the specific foam gas supplied from the gas reservoir to the heat insulating panel assembly.

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