KR100998554B1 - A structure of insulation for lng carrier cargo - Google Patents

Abstract

The present invention relates to a heat insulating structure of a LNG carrier cargo hold, the heat insulating portion is installed through the stud bolt protruding to the outer surface of the cargo hold; And a cap provided at an upper end of the stud bolt and blocking a cold heat from the cargo hold transmitted through the stud bolt, wherein the heat insulating part is insulated in close contact with an outer surface of the cargo hold, and an upper surface of the insulating material. It is characterized by consisting of a hard cover to be located. Therefore, according to the present invention, by installing a heat insulating part consisting of a hard cover for rigid reinforcement on the upper surface of the heat insulating material and aerogel can have an excellent heat insulating effect, the thickness of the insulating layer is reduced, the storage space of the cargo hold is increased, the weight of the cargo hold is reduced It has the effect of reducing the shipping cost by bringing.

Carrier, cargo hold, insulation, airgel

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, the cargo hold storing the LNG is a material that can withstand ultra low temperatures, for example, to safely store and store such LNG. 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 30 is located, and the heat insulating member 32 is attached to the outer surface of the cargo hold 30 made of aluminum alloy. And the cargo hold 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 30 and by fastening nuts, such as nuts, on the threaded tip ends of each stud bolt through fixing members such as washers. It is fixed to the cargo hold 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, insulated structure is installed in the independent cargo hold, by insulating and insulating the heat insulating material consisting of a hard cover for rigid reinforcement on the upper surface of the insulating material and the insulating material laminated to the stud bolt of the cargo hold, excellent insulation through the airgel It is possible to have a performance, as well as to reduce the thickness of the overall insulation layer is to provide a thermal insulation structure of the cargo hold LNG cargo container can be maximized the space efficiency of the cargo hold.

In order to achieve the above object, the present invention, in the heat insulating structure of the LNG carrier cargo hold, the heat insulating portion is installed through the stud bolt protruding to the outer surface of the cargo hold; And a cap provided at an upper end of the stud bolt and blocking a cold heat from the cargo hold transmitted through the stud bolt, wherein the heat insulating part is insulated in close contact with an outer surface of the cargo hold and is positioned on an upper surface of the insulating material. It provides a thermal insulation structure of the LNG carrier cargo hold is composed of a hard cover.

And preferably, the heat insulating material, the material of the airgel is laminated is installed, the heat insulating material is installed laminated, characterized in that it further comprises a blocking member for blocking radiant heat between the heat insulating material.

In addition, a fastening means composed of a washer and a nut is fastened to the stud bolt protruding from the top surface of the hard cover of the heat insulating part to fix the heat insulating part.

In addition, a gap blocking member is installed in the space portion generated between the heat insulation portion and the adjacent heat insulation portion, and the waterproof tape is adhered to the interface between the heat insulation portions to prevent fine gaps.

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 heat insulating effect by installing a heat insulating part composed of a hard cover for rigid reinforcement on the upper surface of the heat insulating material and the aerogel, the thickness of the insulating layer is As a result, the storage space of the hold is increased and the weight of the hold is reduced, thereby reducing the transportation cost.

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.

2 is a cross-sectional view of the insulating structure of the LNG carrier cargo hold according to the present invention, Figure 3 is an exploded perspective view of the insulating structure of the LNG carrier cargo hold according to the present invention, Figure 4 is a LNG carrier according to the present invention Combined plan view of the insulation of cargo holds.

Insulating structure of the LNG carrier cargo hold shown in Figures 2 to 3, the heat insulating portion 110 is installed through the stud bolt 102 protruding to the outer surface of the cargo hold 100, the heat insulating portion 110 ) Is composed of a heat insulating material 112 and a hard cover 114 located on the upper surface of the heat insulating material 112.

The fastening means is fastened to the stud bolt 102 penetrating the heat insulating part 110 to fix the heat insulating part 110 to the cargo hold 100.

Here, the heat insulating material 112 of the heat insulating part 110 that is installed in close contact with the outer surface of the cargo hold 100 is installed in one or more laminated according to the required heat insulating properties in consideration of this because there is a limitation in the manufacturing thickness due to the characteristics of the airgel material. .

And between the heat insulating material 112 is installed laminated is further included a blocking member 113 for shielding radiant heat, preferably, the blocking member 113 is located on the upper and lower surfaces of the heat insulating material 112 as aluminum foil and radiant heat Will block.

In particular, as a feature of a new airgel (Aerogel) used as a heat insulating material 112, the term gel (gel) has a three-dimensional shape as a colloidal particle that is adhesive, solid, and generally has a neutral salt 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 hard cover 114 is installed on the upper surface of the heat insulating material 112 to protect the heat insulating material 112 of the airgel materially weak.

The hard cover 114 is preferably the same area as the planar area of the heat insulator 112, and the material may be a metal material or a composite material and a hard material that does not cause deformation at low temperatures.

The heat insulating part 110 composed of the heat insulating material 112 and the hard cover 114 is installed through the stud bolt 102, the fastening means is installed on the top of the stud bolt 102 through the heat insulating part 110 is firmly fixed to the cargo hold 100, the fastening means is composed of a washer 120 and the nut (122).

In addition, since the cold heat from the cargo hold 100 can be transferred to the end through the stud bolt 102 to the top of the stud bolt 102 fastened with the washer 120 and the nut 122 (cap for heat protection) 130 is further included, the cap 130 is preferably a plastic material.

On the other hand, a space portion may occur due to an assembly tolerance between the heat insulating portion 110 and the adjacent heat insulating portion 110 installed along the outer surface of the cargo hold 100, and the gap blocking member 140 may be formed in the space portion. Is installed.

The gap blocking member 140 is made of a heat insulating material such as airgel or glass wool.

In addition, as shown in FIG. 4, the boundary surface between the heat insulating parts 110 has a structure in which a waterproof tape 150 or an outer cover having a similar function is adhered and sealed to prevent fine gaps.

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

2 to 3 again, an independent cargo hold 100 for storing liquefied natural gas spaced apart from the inside of the inner hull 20 (shown in FIG. 1) is installed, and the cargo hold 100 Heat insulation 110 is installed to the outer surface of the).

That is, the heat insulating material 112 and the hard cover 114 stacked on the stud bolts 102 protruding from the cargo hold 100 are sequentially positioned, and the washer bolts 102 penetrate the heat insulating parts 110. By inserting and tightening through the nut 120 and 120, the heat insulation 110 is fixed to the cargo hold 100.

And the top of the stud bolt 102 to cover the cap 130 to dissipate the cold heat transmitted from the stud bolt 102 directly welded to the cargo hold 100.

Assembly tolerances may occur between the heat insulating parts 110 installed along the outer surface of the cargo hold 100 as follows. As a result, the gap blocking member 140 is positioned in the space part, and the gap blocking member 140 is formed. The waterproof tape 150 is bonded to the upper surface of the heat insulating part 110 completed until the installation is finished.

Therefore, in the conventional heat insulating structure made of polyurethane foam, the thickness of the heat insulating layer is thickened to compensate for the insufficient heat insulating effect, and thus the weight is also increased. By installing the heat insulating part 110 composed of the hard cover 114 for rigid reinforcement, it is possible to reduce the thickness of the heat insulating layer, such as to improve the heat insulating performance.

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 structure of the LNG carrier cargo hold according to the present invention,

3 is an exploded perspective view of the insulating structure of the LNG carrier cargo hold according to the present invention,

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

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

100: cargo hold 102: stud bolt

110: heat insulation 112: heat insulating material

113: blocking member 114: hard cover

120: washer 122: nut

130: cap 140: gap blocking member

150: waterproof tape

Claims (7)

In the insulation structure of the LNG carrier cargo hold, An insulator installed through the stud bolt protruding to the outer surface of the cargo hold; And It is provided on the top of the stud bolt, and includes a cap for blocking the cold heat from the cargo hold delivered through the stud bolt, The heat insulation unit, Insulation material is installed in close contact with the outer surface of the cargo hold, A hard cover located on an upper surface of the insulation Insulated structure of LNG carrier cargo hold. The method of claim 1, The heat insulating material, Insulating structure of LNG carrier cargo hold in which materials of airgel are stacked and installed. The method according to claim 1 or 2, The heat insulating material laminated is installed, Insulating structure of the LNG carrier cargo hold further comprises a blocking member for blocking radiant heat between the insulation. The method of claim 1, The insulating structure of the LNG carrier cargo hold is fixed to the fastening means consisting of a washer and a nut is fastened to the stud bolt protruding to the upper surface of the hard cover of the heat insulating part. delete The method of claim 1, The insulating structure of the LNG carrier cargo hold is provided with a gap blocking member in the space portion generated between the insulating portion and the adjacent insulating portion. The method of claim 1, Insulation structure of the LNG carrier cargo hold is a watertight tape is bonded to the interface between the insulation to prevent the micro-gap.

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