KR102351594B1 - Insulation Box Of Cargo Tank And Manufacturing Method Of The Same - Google Patents

Abstract

Disclosed are an insulation box of a cargo hold and a method for manufacturing the same. The insulation box of the cargo hold of the present invention is an insulation box provided in a cargo hold of a ship or an offshore structure, comprising: upper and lower plates of plate members forming a floor and a ceiling of the insulation box; a plurality of column members provided between the upper and lower plates and spaced apart from each other in the insulation box; and a flexible (flexible) heat insulating material provided to surround each of the pillar members, wherein the remaining space inside the heat insulating box is filled with polyurethane foam for heat insulation.

Description

Insulation Box Of Cargo Tank And Manufacturing Method Of The Same

The present invention relates to an insulation box of a cargo hold and a method for manufacturing the same, and more particularly, a plurality of column members wrapped with a flexible heat insulating material on a lower plate of a plate member constituting the bottom of the insulation box is spaced apart, and an upper plate and a side wall It relates to an insulation box and a method of manufacturing the same, in which the remaining space inside the insulation box is filled with polyurethane foam for insulation after the assembly is finished by covering it with a part.

Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been spotlighted as a low-pollution energy source in various technological fields.

Natural gas is transported in a gaseous state through onshore or offshore gas pipelines, or stored in an LNG carrier in a liquefied liquefied natural gas (LNG) state and transported to a remote consumer. Liquefied natural gas is obtained by cooling natural gas to a cryogenic temperature (about -163℃), 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.

A liquefied natural gas carrier is provided with a cargo hold (also referred to as a storage tank) for storing and storing liquefied natural gas liquefied by cooling the natural gas. Since the boiling point of liquefied natural gas is about -163°C at atmospheric pressure, the cargo hold of liquefied natural gas is made of materials that can withstand extremely low temperatures, such as aluminum steel, stainless steel, and 36% nickel steel, to safely store and store the liquefied natural gas. It is designed to be strong against thermal stress and thermal contraction, and has a structure that can prevent thermal intrusion.

An LNG carrier for loading and unloading LNG to and from an onshore customer by operating the sea; an LNG RV (Regasification Vessel) that loads and operates the sea to arrive at an onshore customer and then regasifies the stored LNG and unloads it into natural gas; recently Floating offshore structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) also include storage tanks installed on LNG carriers or LNG RVs.

As described above, in offshore structures such as LNG carriers, LNG RVs, LNG FPSOs, and LNG FSRUs that transport or store liquid cargo such as LNG at sea, a storage tank for storing LNG in a cryogenic state is installed.

This storage tank can be classified into an independent tank type and a membrane type depending on whether the load of the cargo acts directly on the insulation material. In general, membrane type storage tanks are divided into GTT NO 96 type and TGZ Mark Ⅲ type, and independent tank type storage tanks are divided into MOSS type and IHI-SPB type.

The above-described GTT-type and TGZ-type tank structures are disclosed in U.S. Patent Nos. 6,035,795, 6,378,722, 5,586,513 and U.S. Patent Publication No. 2003-0000949, and Korean Patent Publication Nos. 10-2000-0011347 and 10-2000- 0011346 and the like. In addition, the structure of the independent tank type storage tank is described in Korean Patent Nos. 10-15063 and 10-305513, and the like.

In a cargo hold accommodating liquefied natural gas, thermal insulation and safety are particularly important. Since liquefied natural gas, which is cryogenic, is sensitive to temperature changes, when heat from the outside of the hull penetrates into the cargo hold, the liquefied natural gas is vaporized. used to process it. Therefore, insulation of cargo holds is very important for transport efficiency, and insulation structures are provided in cargo holds. For example, the GTT NO 96 storage tank has a primary sealing wall and a secondary sealing wall made of 0.5 to 0.7 mm thick Invar steel (36% Ni), and pearlite in a plywood box. It is a structure in which the primary insulation box and the secondary insulation box filled with insulation materials such as (perlite) or polyurethane foam are alternately stacked and installed on the inner surface of the hull.

An object of the present invention is to propose a thermal insulation box having excellent thermal insulation performance, structurally stable, and high price competitiveness in the thermal insulation structure provided in such a cargo hold, and a method for manufacturing the same.

According to one aspect of the present invention, in the insulation box provided in the cargo hold of a ship or offshore structure,

Upper and lower plates of the plate member constituting the floor and the ceiling of the insulation box;

a plurality of column members provided between the upper and lower plates and spaced apart from each other in the insulation box; and

Including; a flexible (flexible) insulating material provided to surround each of the pillar members,

There is provided an insulation box of a cargo hold, characterized in that the remaining space inside the insulation box is filled with polyurethane foam for insulation.

Preferably, the insulation box may further include a side wall portion that connects the upper and lower plate ends to form a wall of the insulation box.

Preferably, the side wall portion is provided with a transparent plate material, at least one hole for passing through the nozzle for applying the polyurethane foam to the inside of the insulation box may be provided.

Preferably, a spacer for separation or disassembly of the side wall portion from the polyurethane foam may be applied to the inside of the side wall portion prior to application of the polyurethane foam.

Preferably, the insulation box is disposed at the corners of the upper and lower plates and includes a plurality of T-shaped supports for supporting the upper and lower plates, and supports provided to surround the periphery of the T-shaped support. It may further include a flexible insulating material.

Preferably, the flexible insulating material and the flexible insulating material for the support may be pre-fabricated in a ring shape and assembled by being inserted into the pillar member and the T-shaped support.

According to another aspect of the present invention, in a method for manufacturing an insulation box provided in a cargo hold of a ship or an offshore structure,

1) arranging a plurality of column members to be spaced apart on a lower plate of a plate member constituting the bottom of the insulation box;

2) wrapping each of the pillar members with a flexible heat insulating material;

3) assembling the upper plate by covering the upper part of the pillar member, and finishing assembling the side wall part on the side; and

4) There is provided a method of manufacturing an insulation box of a cargo hold, comprising the step of filling the remaining space inside the insulation box with polyurethane foam for insulation.

Preferably, the flexible insulating material is pre-fabricated in the form of a ring and assembled by inserting the pillar member,

At least one hole for passing the nozzle is provided in the side wall portion, and the polyurethane foam is applied to the hole for passing the nozzle to fill the space of the insulation box.

According to the insulation box of the cargo hold and its manufacturing method of the present invention, it is easy to manufacture due to high workability, and it is possible to increase cost competitiveness. In addition, it is possible to prevent the occurrence of void space in the insulation box, it is possible to provide an insulation box excellent in insulation performance.

1 to 3 show a schematic manufacturing process of the insulation box of the cargo hold according to an embodiment of the present invention, Figures 4 and 5 schematically show a cross section of the completed insulation box.
6 schematically shows a state in which an insulation box is disposed in a cargo hold.

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.

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.

1 to 3 illustrate a schematic manufacturing process of the insulation box of a cargo hold according to an embodiment of the present invention, and FIGS. 4 and 5 schematically illustrate a cross-section of the completed insulation box.

As shown in Figures 1 to 4, the insulation box provided in the cargo hold of a ship or offshore structure according to an embodiment of the present invention, the upper and lower plates (10T, 10B) of the plate member constituting the floor and ceiling of the insulation box ), and a plurality of column members 20 provided between the upper and lower plates and disposed to be spaced apart inside the insulation box, and a flexible heat insulating material 30 provided to surround each column member, and heat insulation The remaining space inside the box is filled with polyurethane foam for insulation.

A plurality of T-shaped supports 25 for supporting the upper and lower plates are disposed at corner portions of the upper and lower plates. The periphery of the T-shaped support is wrapped with a flexible insulating material 35 for support.

The flexible insulating material 30 surrounding the pillar member 20 and the flexible insulating material 35 for the support surrounding the T-shaped support 25 may be, for example, urethane or Basotect, and glass wool. it may be This can be pre-fabricated in a ring shape according to the shape of the column member and the T-shaped support, and then assembled by inserting it into the column member and the T-shaped support.

In the insulation box, the side wall portion 15 forming the wall of the insulation box by connecting the ends of the upper and lower plates is provided on four side surfaces.

The side wall portion 15 may be made of a transparent plate material, for example, transparent acrylic, and a hole (H) for passing the nozzle for applying the polyurethane foam to the inside of the insulation box is provided. By providing the side wall with a transparent plate material, the polyurethane foam foaming process inside the insulation box is made visible, thereby preventing the void space from being generated inside the insulation box due to incomplete foaming and improving the insulation properties of the insulation box. The side wall portion 15 may be removed after curing of the polyurethane foam foamed inside the insulation box is completed.

A plurality of holes for passing the nozzle may be provided. As shown in Fig. 3, the polyurethane stock solution is injected into the insulation box through the hole (H) for passing the nozzle, and the polyurethane foam is used to expand and fill the inner space of the insulation box. The amount of stock solution injected can be calculated based on the volume of the inner space of the insulation box. It is possible to fill the inner space with glass wool, but if glass wool is the main insulation material, it should be composed of several layers to prevent convection, and materials that are not ventilated should be inserted between the layers. It is complicated to do this work in the interior space where the column member is, and it is difficult to insert the glass wool by punching it precisely. In this embodiment, polyurethane foam as the main insulation material is injected into the insulation box to expand and foam, and in particular, the work situation inside can be checked through the transparent acrylic, so the operation is easy. Polyurethane foam also has superior thermal insulation performance compared to glass wool, so it also has the advantage of improving the thermal insulation properties of the insulation box.

In particular, the flexible insulation material or glass wool surrounding the column member may be compressed by the foaming pressure of the polyurethane foam during manufacturing. , it is possible to prevent the occurrence of void space inside the insulation box as the compressed flexible insulation material or glass wool is recovered.

As such, this embodiment is configured to compensate for the amount of heat shrinkage, which is a weakness of polyurethane foam, with a flexible insulating material or glass wool with high elasticity, thereby blocking the occurrence of voids and maintaining the insulation of the insulation box and furthermore the cargo hold to reduce the generation of boil-off gas. make it possible

On the other hand, before applying the polyurethane foam to the inside of the insulation box space, by applying a spacer to the inner surface of the transparent acrylic forming the side wall, it is possible to facilitate the separation or disassembly of the side wall portion 15 from the polyurethane foam. After the curing of the polyurethane foam is completed, the cross-sectional shape of the final insulation box with the side wall portion 15 removed is as shown in FIG. 5 .

Looking briefly at the manufacturing process of the insulation box as described above, 1) on the lower plate 10B of the plate member constituting the bottom of the insulation box, a plurality of column members 20 are spaced apart, and the disposing a T-shaped support (25); 2) wrapping each column member with a pre-fabricated flexible insulating material 30 in the form of a ring, and assembling the T-shaped support by wrapping it with a flexible insulating material 35 for support; 3) assembling by covering the upper plate 10T on the upper part of the column member, and finishing the assembly of the side wall part 15 on the side; and, 4) filling the remaining space inside the insulation box with polyurethane foam for insulation.

Through the hole (H) for passing the nozzle provided in the side wall portion 15 of the insulation box, the polyurethane stock solution is injected and the polyurethane foam can fill the space of the insulation box by foaming and expanding it. When curing of the polyurethane foam is completed, the side wall portion 15 may be removed.

6 schematically shows the arrangement of the insulation box in the cargo hold. In this way, after disposing the insulation box (PB) produced as described above, it is fixed with a securing device (200) at the corners between the insulation boxes, and an insulation material such as glass wool ( 100) to form a cargo hold. By filling the space between the insulation boxes with glass wool compressed in the thickness direction, heat shrinkage in the X and Y axis directions of the insulation box can be offset under operating conditions.

The present invention is not limited to the above embodiments, and it is apparent to those of ordinary skill in the art that various modifications or variations can be implemented without departing from the technical gist of the present invention. did it

10T: top plate
10B: lower plate
15: side wall part
20: column member
25: T-shaped support
30: flexible insulation
35: flexible insulation for support

Claims (8)

In the insulation box provided in the cargo hold of a ship or offshore structure,
Upper and lower plates of the plate member forming the floor and the ceiling of the insulation box;
a plurality of column members provided between the upper and lower plates and spaced apart from each other in the insulation box;
a flexible heat insulating material provided to surround each of the pillar members;
A plurality of T-shaped supports (support) disposed at the corners of the upper and lower plates to support the upper and lower plates; and
A flexible insulating material for support provided to surround the periphery of the T-shaped support; includes,
The insulation box of the cargo hold, characterized in that the polyurethane foam for insulation is filled in the remaining space inside the insulation box. According to claim 1, wherein the insulation box
The insulation box of the cargo hold further comprising a side wall portion forming a wall of the insulation box by connecting the upper and lower plate ends. 3. The method of claim 2,
The side wall portion is provided with a transparent plate material, the insulation box of the cargo hold, characterized in that the at least one nozzle passing hole (hole) for applying the polyurethane foam to the inside of the insulation box is provided. 4. The method of claim 3,
Prior to application of the polyurethane foam to the inside of the side wall portion, a spacer for separation or disassembly of the side wall portion from the polyurethane foam is applied. delete The method of claim 1,
The flexible insulating material and the flexible insulating material for the support are pre-fabricated in the form of a ring, and the insulation box of the cargo hold, characterized in that it is inserted into the column member and the T-shaped support and assembled. delete delete

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