KR101031251B1 - A structure of insulation for lng carrier cargo - Google Patents

Abstract

The present invention relates to an insulating structure of a cargo hold for a LNG carrier, wherein an insulating box having a sealed space therein and having structural rigidity is stacked and filled with airgel, polyurethane foam or polystyrene in the inner space of the insulating box. Insulation. Therefore, according to the present invention, the insulation may be excellently insulated due to the insulation box laminated or filled in a matrix form, and the thickness of the insulation layer is reduced, thereby increasing the storage space of the cargo hold and reducing the weight of the cargo hold, thereby increasing transportation costs. There is an effect that can be reduced.

Cargo hold, Insulation box, Insulation, Freestanding, Membrane

Description

Insulation structure of LNG carrier cargo hold {A STRUCTURE OF INSULATION FOR LNG CARRIER CARGO}

The present invention relates to an insulating structure of the cargo hold of the LNG carrier, and more particularly, the heat insulating material used for the cargo hold for cryogenic liquid storage can be reduced in thickness and lightly formed as a whole while having excellent heat insulating performance. The present invention relates to an insulating structure of a LNG carrier cargo hold.

In general, liquefied natural gas (LNG) refers to a colorless transparent cryogenic liquid whose natural gas containing methane as its main component is cooled to minus 163 ° C and its volume is reduced to one hundredth.

As such liquefied natural gas has emerged as an energy resource, an efficient transportation method that can transport a large amount from the production base to the receiving site of the demand in order to use this gas as energy has been considered. LNG carriers have emerged to transport gas offshore.

By the way, the LNG carrier should be provided with a cargo hold (Cargo) to store and store the liquefied natural gas liquefied in the cryogenic state, there was a lot of difficulties due to the very demanding conditions. That is, since LNG has a vapor pressure higher than atmospheric pressure, and has a boiling temperature of about 163 degrees Celsius, it is possible to safely store and store such LNG, so that the cargo hold storing the LNG is a material that can withstand ultra low temperatures, eg For example, it must be made of aluminum steel, stainless steel, 35% nickel steel, etc., and must be designed with a unique insulation structure that is resistant to other thermal stresses and heat shrinkage and prevents heat intrusion.

Here, the cargo hold applied in the LNG carrier has a membrane type and a stand-alone type, and the stand type is SPB (Self Supporting Prismatic) type and Morse type.

Figure 1 shows the structure of the insulated tank of the conventional independent LNG carriers as one of the cargo hold type. As shown in the figure, the structure of the insulated tank is composed of a double hull outer hull 10 and a hull inner hull 20, and is spaced apart from the inner hull 20 to store the liquefied natural gas. The cargo hold body 30 is located, and the heat insulating member 32 is attached to the outer surface of the cargo hold body 30 made of aluminum alloy. And the cargo hold body 30 has a structure that is supported for the support member 34 located on the inner hull (20).

The heat insulating member 32 comprises a plurality of insulating panels made of, for example, polyurethane foam (R-PUF). Each panel is supported at four corners by stud bolts protruding from the outer surface of each cargo hold body 30 and tightens a nut-like fastening member on the threaded tip end of each stud bolt through a fixing member such as a washer. It is fixed to the cargo hold body (30).

However, the thermal insulation structure composed of polyurethane foam as described above, is insufficient to effectively insulate the cryogenic liquefied natural gas. For this reason, in the related art, the thickness of the cargo hold has been adversely affected by excessively thickening the insulation structure.

In addition, since the thickness of the insulation structure is thick, workability in the space (HOLD) between the outer wall of the cargo hold body is lowered, manufacturing cost is increased, and the transportation cost is increased by the weight of the insulation layer.

Therefore, in the present invention, in the insulating structure constituting the cargo hold by stacking or filling the insulating material inside the insulating box having a structural strength, it is possible to have excellent heat insulating performance, as well as to reduce the thickness of the overall insulating layer space of the cargo hold. It is an object of the present invention to provide an insulating structure of a cargo hold of a LNG carrier that can maximize efficiency.

In order to achieve the above object, the present invention, in the thermal insulation structure of the LNG carrier cargo hold, forming a sealed space therein and having a structural rigidity, and aerogel, polyurethane foam or polystyrene in the inner space of the insulating box Provided is an insulating structure of a LNG carrier cargo hold including the laminated or filled insulation.

And preferably, the insulation box is installed along the outer surface of the cargo hold body independently installed to store the liquefied natural gas in the inner hull of the liquefied natural gas carrier ship, a spacer is installed between the insulating box and the cargo hold body, spacer Nitrogen gas for cargo hold monitoring is filled in the gap formed between the insulation box and the cargo hold body.

In addition, the thermal insulation box is installed along the inner surface of the liquefied natural gas carrier to form a membrane-shaped cargo hold.

And the insulation box has a structure of a polyhedron or a curved body according to the structure of the cargo hold, characterized in that the outer surface of the insulation box is finished with a waterproof coating for the protection of the insulation located inside from the humidity and air from the outside. do.

In addition, when the heat insulating material laminated in the heat insulation box further includes a blocking member for blocking radiant heat.

In addition, the lower edge of the insulation box is formed integrally protruding from the fixing portion for fastening with the inner hull or fastening with an independent cargo body, the fixing portion is formed on two sides or all the edges facing each other.

In addition, a blocking member is installed in the space portion of the insulating box adjacent to the insulating box, the blocking member is characterized in that the airgel or polyurethane foam is laminated or filled inside the box form to form a closed inner space. do.

In addition, the blocking member may be made of glass wool material.

And the upper surface of the blocking member may further include a blocking cover pad, the upper surface of the blocking cover pad is characterized in that the waterproof tape is bonded to prevent the micro-gap.

As described above, according to the insulating structure of the cargo hold of the liquefied natural gas carrier, it is possible to have an excellent insulating effect due to the insulation box laminated or filled in a matrix form therein, the thickness of the insulation layer is reduced, the storage space of the cargo hold This increases the weight of the cargo hold, thereby reducing the cost of transportation.

Hereinafter, the operating principle of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, when it is determined that a detailed description of a known function or configuration may unnecessarily obscure the subject matter of the present invention, the detailed description thereof will be omitted. The following terms are defined in consideration of the functions of the present invention, and may be changed according to the intentions or customs of the user, the operator, and the like. Therefore, the definition should be based on the contents throughout this specification.

Figure 2 is a cross-sectional view of the insulating box in the insulating structure of the LNG carrier cargo hold according to the present invention, Figure 3 is a combined plan view of the insulating structure of the LNG carrier cargo hold according to the present invention, Figure 4 is an embodiment of the present invention Coupling cross-sectional view of the insulating structure of the LNG carrier cargo hold according to the example, Figure 5 is a combined cross-sectional view of the insulating structure of the LNG carrier cargo hold according to another embodiment of the present invention.

Insulation structure of the LNG carrier cargo hold shown in Figures 2 to 3, forming a sealed space therein, the insulation box 100 having a structural rigidity, and the aerogel, polyurethane in the inner space of the insulation box 100 It consists of a heat insulating material 110 in which foam or polystyrene is laminated or filled.

Here, the insulation box 100 may be formed of a metal material or a composite material having structural rigidity, and having no deformation at low temperature. According to the structure of the cargo hold is preferably applied having a structure of a polyhedron of a tetrahedron or a triangular body and a curved body installed in the curved corner of the cargo hold, more preferably, the outer surface of the insulation box 100 in the outside humidity and air Finished with a waterproof coating for protection of the insulation 110 located therein from.

In the inner space of the sealed insulation box 100, the insulation 110 of airgel, polyurethane foam, or polystyrene is laminated in a matrix of a predetermined thickness, or the insulation 110 is molded according to an internal space size. After that is installed in the form of filling in the insulation box 100.

In addition, it is also possible to use a mixture of aerogel, polyurethane foam or polystyrene exemplified as the heat insulator 110, in addition to the material that can exhibit the heat insulating performance is applicable.

In particular, as a feature of the new airgel (Aerogel) used as a heat insulator 110, the term gel (gel) is adhesive, durable and has a continuous three-dimensional shape as a colloidal particles, in general, In the absence of acid, colloidal particles are aggregated under the acidic conditions to form a three-dimensional gel microstructure, and the gel has been described as a low-density aerogel is produced by maintaining a sticky gel microstructure by supercritical drying. Aerogel is a low-density material with nano-porous structure, extremely low thermal conductivity, acoustic wave conductivity, and excellent insulation, soundproof, dustproof, infrared ray blocking, and shock absorption characteristics. There is a problem that the insulation performance is deteriorated when compressed to the fragility and high pressure, there are various problems to apply as a heat insulating material of the LNG carrier.

Therefore, in the present invention, the insulating material 110 of the airgel, which is weak in terms of material, may be embedded in the insulating box 100 having structural rigidity. Moreover, the polyurethane foam used as the heat insulator 110 also has to be thick in order to achieve heat insulation effectively, but by inherent in the heat insulation box 100, it can exhibit an excellent heat insulation effect.

On the other hand, when the heat insulating material 110 is laminated between the heat insulating material 110 further includes a blocking member 112 for blocking radiant heat, and the blocking member 112 of the aluminum foil is positioned on the upper and lower surfaces of the heat insulating material 110. Block radiant heat.

And the edge portion of the bottom lower surface constituting the heat insulating box 100 is fixed to the fixed portion 120 is integrally formed to a predetermined length, it may be formed to protrude on all edges of the two sides or four sides facing as an example.

The fixing part 120 is provided with a fastening hole 122 for screw insertion.

The insulation box 100, as shown in Figure 4 is installed along the outer surface of the cargo hold body 30 independently installed to store the liquefied natural gas in the inner hull 20 of the liquefied natural gas carrier ship, The spacer 140 is installed between the insulating box 100 and the cargo hold body 30. The spacer 140 is made of a material of mastic or bulk.

Furthermore, the gap formed between about 5 to 10 mm between the insulation box 100 and the cargo hold body 30 through the spacer 140 is filled with nitrogen to increase the insulation effect or detect the amount of change in the nitrogen gas that is filled to leak or not. Can be monitored.

In the membrane-type cargo hold shown in FIG. 5, the insulation box 100 is installed along the inner surface of the hull inner hull 200 of the LNG carrier.

In addition, the insulation box 100 installed in the independent cargo hold or the membrane cargo hold is continuously installed to form a space with the adjacent insulation box 100, the blocking member 130 is installed to fill this space.

The blocking member 130 may be installed by laminating or filling an airgel, polyurethane foam, or polystyrene in a box form to form a sealed inner space in the same configuration as the heat insulation box 100. And in some cases it may be installed in a glass wool material of the same size as the size of the space portion as another example.

As described above, when the blocking member 130 is made of glass wool, the upper surface of the blocking member 130 may further include a blocking cover pad 132, and the blocking cover pad 132 may be a hard metal material or a composite material.

In addition, the upper surface of the blocking member 130 filled with a heat insulating material or the upper surface of the blocking member 130 and the blocking cover pad 132 of the glass wool material to prevent the micro-gap in the waterproof tape 134 or similar functions. It has a structure in which the outer skin having the adhesive bonds and is sealed.

The action of the insulating structure of the LNG carrier cargo hold composed of such a structure is made as follows.

First, looking at the installation of the insulating box 100 in the independent cargo hold shown in Figure 4, the inner cargo space (30: shown in Figure 1) spaced apart inside the independent cargo body for storing the liquefied natural gas 30 Is installed, the heat insulation box 100 is installed through the spacer 140 to the outer surface of the cargo body 30.

That is, the outside of the cargo hold body 30 by penetrating the fastening hole 122 of the fixing part 120 to the stud bolt 36 protruding from the cargo hold body 30 and fixing it with a washer and a nut (not shown). The insulation box 100 is installed along the surface.

And the blocking member 130 is installed in the space between the adjacent insulating box 100, the blocking member 130, as described above in the form of a laminated or filled airgel or polyurethane foam inside the box form It can be or glass wool.

When the blocking member 130 is glass wool, the blocking cover pad 132 is installed on the upper surface of the blocking member 130. Waterproofing tape 134 is attached to the interface between the insulating box 100 is installed up to the blocking member 130 to complete the thermal insulation structure on the cargo body 30.

Referring to the installation process of the insulation box 100 in the membrane-shaped cargo hold shown in Figure 5, the epoxy mastic (202: Epoxy Mastic) and the stud bolt (204) along the inner surface of the hull inner hull 200 of the LNG carrier The insulation box 100 is installed by the stud bolt). At this time, the stud bolt 204 is penetrated through the fastening hole 122 of the fixing part 120 is made of a washer and a nut (not shown).

And the blocking member 130 is installed in the space between the adjacent insulating box 100, such as installed in the independent cargo hold, the blocking member 130, as described above in the form of a box aerogel or polyurethane inside The foam may be laminated or filled, or may be glass wool.

When the blocking member 130 is glass wool, the blocking cover pad 132 is installed on the upper surface of the blocking member 130. At the interface between the insulation box 100 installed to the blocking member 130, a waterproof tape is attached to form a secondary barrier.

And the corrugated membrane 140 (Corrugated Membrane) of the corrugated shape is attached to the primary barrier on the upper surface having the same plane of the insulating box 100 and the blocking member 130 to complete the cargo hold wall surface.

Therefore, conventional insulation panel made of polyurethane foam has a thicker thickness of the heat insulation layer to compensate for the insufficient heat insulation effect, thereby increasing the weight of the insulation panel in the present invention. In addition, it is possible to increase the thermal insulation performance using the aerogel insulator 100, moreover.

What has been described above is just one preferred embodiment of the insulating structure of the LNG carrier cargo hold using the airgel according to the present invention, the present invention is not limited to the above embodiment, but is claimed in the following claims As will be apparent to those skilled in the art to which the present invention pertains without departing from the gist of the present invention, the technical spirit of the present invention may be changed to the extent that various modifications can be made.

Figure 1 shows the structure of the insulating tank of the conventional independent LNG carriers as one of the cargo hold type,

2 is a cross-sectional view of the insulating box in the insulating structure of the LNG carrier cargo hold according to the present invention,

3 is a combined plan view of the insulating structure of the LNG carrier cargo hold according to the present invention,

4 is a cross-sectional view of a combined heat insulating structure of the LNG carrier cargo hold according to an embodiment of the present invention,

5 is a combined cross-sectional view of the insulating structure of the LNG carrier cargo hold according to another embodiment of the present invention.

<Description of the symbols for the main parts of the drawings>

100: insulation box 110: insulation

112: blocking member 120: fixed part

122: fastening hole 130: blocking member

132: blocking pad 134: waterproof tape

140: spacer

Claims (14)

It is installed along the outer surface of an independent cargo body provided inside the inner hull of the LNG carrier, and the nitrogen gas for monitoring the cargo is filled in the gap by the spacer of the cargo body. In Airgel or polyurethane that forms an enclosed interior space, and has structural rigidity as a structure of a polyhedron or a curved body according to the structure of the cargo hold, and is laminated or filled in the interior space of an insulation box located inside from outside humidity and air An insulation box whose outer surface is finished by a waterproof coating to protect the insulation having foam or polystyrene, An insulation material in which one of an airgel or polyurethane foam or polystyrene is laminated in an inner space of the insulation box; Includes a blocking member for blocking radiant heat between the insulation Insulation structure of LNG carrier cargo hold. delete delete In the insulation structure of the LNG carrier cargo hold installed along the inner surface of the LNG carrier cargo hull, forming a membrane-shaped cargo hold, Airgel or polyurethane that forms an enclosed interior space, and has structural rigidity as a structure of a polyhedron or a curved body according to the structure of the cargo hold, and is laminated or filled in the interior space of an insulation box located inside from outside humidity and air An insulation box whose outer surface is finished by a waterproof coating to protect the insulation having foam or polystyrene, An insulation material in which one of an airgel or polyurethane foam or polystyrene is laminated in an inner space of the insulation box; Includes a blocking member for blocking radiant heat between the insulation Insulation structure of LNG carrier cargo hold. delete delete delete The method according to claim 1 or 4, At any one of the edges of the bottom bottom surface of the insulation box or all the edges of the two sides or four sides facing the insulation box, Fixed parts for fastening with the inner hull or fastening with the independent cargo hold body are integrally formed Insulation structure of LNG carrier cargo hold. delete The method according to claim 1 or 4, Blocking member is installed in the space portion of the insulating box and the adjacent insulating box, It may be formed of a glass wool material or by laminating one of an airgel or polyurethane foam or polystyrene in a box-shaped interior having a closed inner space, A blocking cover pad installed on an upper surface of the blocking member; It includes a waterproof tape attached to the upper surface of the blocking cover pad to prevent the micro-gap. Insulation structure of LNG carrier cargo hold. delete delete delete delete

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