KR20130075259A - Multiple insulation box for a lng storage tank and its manufacturing method - Google Patents

Abstract

PURPOSE: An insulation box for a hold of an LNG vessel and a manufacturing method thereof are provided to improve the intensity and the performance of insulation and to simplify the manufacturing work of the insulation box. CONSTITUTION: An insulation box (1) for a hold of an LNG vessel comprises a storage tank, a first insulation box (110), a second insulation box (120), and coupling members (130). The storage tank stores LNG therein. The first and second insulation boxes are successively formed between the inner walls of a hull and have a multi-layer structure. The coupling members are supported to coupling areas and couple the insulation boxes to each other.

Description

MULTIPLE INSULATION BOX FOR A LNG STORAGE TANK AND ITS MANUFACTURING METHOD}

The present invention relates to an insulation box for a cargo hold of an LNG ship and a manufacturing method, and more particularly, a gas carrier carrying a liquefied natural gas (LNG), a floating offshore structure (LNG-FPSO, The present invention relates to a heat insulation box for a cargo hold of an LMG vessel having a multi-layered insulation box of an LNG storage tank used for storing liquefied natural gas in an LNG-FSRU) and an LNG regasification vessel (LNG-RV).

In general, natural gas is transported in the form of gas through land or sea gas pipelines, or stored in a LNG carrier in the form of liquefied natural gas (hereinafter referred to as "LNG"), Lt; / RTI >

Such LNG is obtained by cooling natural gas to a cryogenic temperature, for example, approximately -163 DEG C, and its volume is reduced to about 1/600 of that of natural gas in a gaseous state, so that it is suitable for long distance transportation through the sea.

These LNGs are transported through LNG transporting vessels, transported through the sea, unloaded to landfill sites, carried on LNG RV (LNG Regasification Vessel), transported through the sea, reached to land requirements, recharged and unloaded as natural gas LNG carriers and LNG RVs are equipped with LNG storage tanks (also called "cargo holds") that can withstand the extreme temperatures of LNG.

In addition, demand for floating floating structures such as LNG FPSO (Floating Production Storage and Offloading) and LNG FSRU (Floating Storage and Regasification Unit) is increasing, and these floating structures are installed in LNG carriers or LNG RVs LNG storage tanks are included.

Here, LNG FPSO is a floating marine structure that is used to directly liquefy natural gas produced from the sea and store it in a storage tank, and to transfer LNG stored in a storage tank to an LNG transport if necessary.

In addition, the LNG FSRU is a floating type of offshore structure that stores LNG unloaded from an LNG carrier in a sea off the sea, stores it in a storage tank, and vaporizes the LNG as needed to supply it to the customer.

Such LNG storage tanks are classified into independent tank type and membrane type according to whether the insulation material for storing LNG at low temperature directly affects the load of cargo. The tank is divided into MOSS type and IHI-SPB type, and the membrane type storage tank is divided into GT NO 96 type and TGZ Mark III type.

1 is a cross-sectional view schematically showing a cargo hold, that is, a membrane type GT NO 96 type according to an embodiment of the prior art.

As shown in FIG. 1, a barrier of a cargo hold according to an exemplary embodiment of the prior art is stacked and installed on an inner wall H of a hull, and includes a primary insulation box including plywood boxes, perlites, and the like. 10 and the secondary insulation box 20. Prior art related to such cargo holds is disclosed in Korean Patent Registration Publication No. 10-1012644 (2011.01.27).

The primary insulation box 10 of the cargo hold is located on the LNG side, the secondary insulation box 20 is installed to be located on the inner wall (H) side of the hull. The primary sealing wall M1 and the secondary sealing, each made of Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, are formed on each of the primary insulating box 10 and the secondary insulating box 20. Walls M2 are respectively installed.

The cargo hold according to the exemplary embodiment of the prior art fills the insulation space of each of the primary insulation box 10 and the secondary insulation box 20 with particulate pearlite (not shown), and then nitrogen gas (not shown). In order to ensure the insulation performance by filling the and to be used to detect the leaked gas.

The insulation box of the cargo hold according to one embodiment of the prior art has a risk of damage to the insulation box due to the sloshing impact force during operation, to increase the thickness of the insulation box to prevent this risk insulation box To improve the strength.

However, the increase in the thickness of the insulation box has a limit in the relationship with the insulation performance because it leads to a decrease in the insulation material filled in the interior of the insulation box. That is, the LNG Boil Off Rate (BOR) is generated 0.15% or 0.155% on a daily basis.

Korea Patent Registration No. 10-1012644 (Daewoo Shipbuilding & Marine Engineering Co., Ltd.) 2011. 01. 27

Therefore, the technical problem to be achieved by the present invention, by providing a multi-layered insulation box to improve the strength and insulation performance of the insulation box, and also to make the insulation box for the cargo hold of LNG ships and the production of insulation box can be convenient To provide a way.

According to an aspect of the present invention, between the storage tank in which the LNG is stored and the inner wall of the hull for cargo holds of LNG ship comprising a secondary insulation box and a primary insulation box which is provided in turn from the inner wall of the hull In the thermal insulation box, at least one of the primary insulation box and the secondary insulation box has a multi-layered structure by stacking two or more insulation boxes to be laminated and coupled to each other by fastening the two or more insulation boxes to each other by being fastened to a fastening area. An insulation box for a cargo hold of an LNG ship including a fastening member which does not fall in the opposite direction of the fastening direction may be provided.

At least one of the primary insulation box and the secondary insulation box, a first insulation box; And a second heat insulating box laminated to each other by the first heat insulating box and the fastening member, wherein the first heat insulating box and the second heat insulating layer are stacked in a combined region of the first heat insulating box and the second heat insulating box. A plurality of communication holes for communicating the boxes with each other may be provided.

The first heat insulating box and the second heat insulating box may include a plurality of partition members which partition respective internal spaces.

The plurality of partition members provided in the first insulation box and the plurality of partition members provided in the second insulation box may be arranged to cross each other.

The fastening member may include a fastening member body having a horizontal unit member and a bending unit member which is bent and extended at both ends of the horizontal unit member, respectively; And it may include a protrusion provided in each of the bending unit member.

The protrusions may be provided in plural but spaced apart from each other.

The protrusion may have a triangular cross-sectional shape.

The insulation box for cargo hold of the LNG ship may be disposed on the side wall portion of the storage tank.

In addition, according to another aspect of the present invention, in the method of manufacturing a cargo box insulation box of the LNG ship, a plurality of communication holes in each of the laminated area of any one insulation box and the other insulation box of two or more insulation boxes stacked on each other. Forming a; And it can be provided a method of manufacturing a thermal insulation box for the cargo hold of the LNG ship comprising the step of fastening each one of the insulating box and the other one of the insulating box using a fastening member.

The method may further include filling a powder-type heat insulating member to the one heat insulation box and the other heat insulation box.

The one insulation box is sealed in the inner space, the other insulation box is open in one direction for the fastening of the fastening member, the step of sealing the open space of the other insulation box It may further include.

The fastening member includes: a fastening member body having a horizontal unit member and a bending unit member which is bent and extended at both ends of the unit horizontal member, respectively; And projections provided on the bending unit members, respectively, and are supported by the fastening area of the heat insulation box and may not fall in the opposite directions in the mutual fastening direction.

The method may further include providing a plurality of partition members in one of the heat insulation boxes and the other heat insulation box.

In addition, according to another aspect of the present invention, in the insulation box for cargo holds of LNG ships, the insulation box has a multi-layer structure by an interlayer member that partitions the internal space in multiple layers, the interlayer member may be provided in a single layer. .

Embodiments of the present invention, while improving the strength and thermal insulation performance of the thermal insulation box can facilitate the manufacturing work of the thermal insulation box.

1 is a cross-sectional view schematically showing a state in which a heat insulation box is installed in a cargo hold, that is, membrane type GT NO 96 according to an embodiment of the prior art.
2 is a view schematically showing an insulation box for a cargo hold of an LNG ship according to an embodiment of the present invention.
Figure 3 is an exploded perspective view of the insulation box for cargo hold of the LNG ship shown in FIG.
4 is a view schematically showing a state of use of the insulating box for cargo holds of LNG ships according to an embodiment of the present invention.
5 is a view showing a method for manufacturing a heat insulation box for cargo hold of an LNG ship according to another embodiment of the present invention.

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

Hereinafter, the present invention will be described in detail with reference to the preferred embodiments of the present invention with reference to the accompanying drawings. Like reference symbols in the drawings denote like elements.

FIG. 2 is a view schematically showing an insulation box for a cargo hold of an LNG ship according to an embodiment of the present invention, and FIG. 3 is an exploded perspective view of the insulation box for a cargo hold of an LNG ship shown in FIG. 2.

As shown in these figures, the insulation box 1 for cargo hold of an LNG ship according to the present embodiment is provided between a storage tank (not shown) in which liquefied natural gas (LNG) is stored and an inner wall (H) of the hull. By stacking two or more insulating boxes are laminated and provided with a primary insulating box 100 and a secondary insulating box (200, see Fig. 4) having a multi-layer structure.

This embodiment may include at least one of the primary insulation box 100 and the secondary insulation box 200, the primary insulation box 100 and the secondary insulation box 200 all have a multi-layer structure. In addition, since only one of the two may have a multi-layer structure, the scope of the present invention is that both the primary insulation box 100 and the secondary insulation box 200 has a multilayer structure and the primary insulation box 100 and 2 The scope of the right to be applied to all of the car insulation box 200 is not limited.

In the present embodiment, the primary insulation box 100 is disposed close to the inner wall of the hull (H, see FIG. 4) to insulate the liquefied natural gas stored in the storage tank primarily, and the secondary insulation box 200 is It is disposed between the primary insulation box 100 and the inner wall (H) of the hull serves to insulate the liquefied natural gas secondary.

In the present embodiment, since the primary insulation box 100 and the secondary insulation box 200 have the same structure, the primary insulation box 100 and the secondary insulation box 200 have the same structure.

The primary insulation box 100 is not a single layer structure (see FIG. 1) as in the exemplary embodiment of the prior art, but a multilayer structure provided by integrally stacking and combining the first insulation box 110 and the second insulation box 120. Has

As a result, unlike one embodiment of the prior art having a single-layer structure, it is possible to secure the stability of the vessel structurally and to improve the strength of the insulation box, the long structural material such as buckling (pillar) caused by the external force (構造 材) Bend under pressure in the direction of the length) can be prevented.

That is, in this embodiment, the first insulation box 110 and the second insulation box 120 are stacked to fabricate a primary insulation box 100 as in the related art. Since the embodiment forms a multilayer structure, there is an advantage that the buckling strength, which represents the strength when the crushing of the pillar under compression is generated due to the reduction in height, is improved.

Specifically, since the first heat insulation box 100 and the second heat insulation box 120 partition the primary insulation box 100 into a space of a narrow interval, the compressive force applied to the primary insulation box 100 is dispersed, and the primary The height of the inner space of the insulation box 100 is reduced to improve the buckling strength.

In addition, it is possible to increase the height of the insulation box to improve the insulation, so that the BOR (Boil Off Rate) of the liquefied natural gas can be lowered to 0.15% or less, and can be conveniently combined by the fastening member 130 to be described later. There is an advantage.

Now, the primary insulation box 100 in detail, the primary insulation box 100, as shown in Figures 2 and 3, the first insulation box 110 and the first insulation box 110. It includes a second heat insulating box 120 to be laminated and coupled to the upper side of the fastening member 130 for coupling the first heat insulating box 110 and the second heat insulating box 120.

As shown in FIG. 2, the first heat insulation box 110 of the primary heat insulation box 100 may include a plurality of agents coupled to the first bottom portion 111 and the upper portion of the first bottom portion 111. The first side wall portion 112 and the first ceiling portion 113 coupled to the upper portion of the plurality of first side wall portion 112 to form a sealed space.

In addition, in the present embodiment, the first heat insulating box 110 further includes a plurality of first partition members 114 provided in the inner space, as shown in FIG. 2, to increase the strength.

In the present exemplary embodiment, as illustrated in FIG. 3, a plurality of first communication holes 113a are provided in the first ceiling part 113 of the first heat insulating box 110. In the present embodiment, the plurality of first communication holes 113a are in communication with each other (see FIG. 2) of the second communication holes 121a of the second heat insulating box 120 to be described later, and powder-type heat insulating members such as perlite. It serves to fill the primary insulation box 100 at a time.

In addition, in the present embodiment, the first communication hole 113a may be formed in various shapes and sizes such as a circle and an oval.

As shown in FIG. 2, the second insulation box 120 of the primary insulation box 100 is stacked on an upper side of the first insulation box 110 and corresponds to the plurality of first communication holes 113a. A second bottom portion 121 provided with a plurality of second communication holes 121a at a position; a plurality of second side wall portions 122 coupled to an upper portion of the second bottom portion 121; The second ceiling part 123 is coupled to an upper side of the side wall part 122 to form a closed space.

In addition, in the present embodiment, the secondary insulating box 200 further includes a plurality of second partition members 124 provided in the inner space, as shown in FIGS. 2 and 3, in order to increase the strength.

Although the plurality of second partition members 124 are not shown in the present embodiment, the plurality of second partition members 124 may be provided to intersect with the plurality of first partition members 114 in order to improve strength by a simple arrangement change.

In the present embodiment, the second communication hole 121a may be formed in various shapes and sizes, such as a circle and an ellipse, like the first communication hole 113a.

The fastening member 130 fastens the first heat insulating box 110 and the second heat insulating box 120 to each other, but is held in the fastening area and does not fall in the opposite direction in the fastening direction, as shown in FIG. 2. The fastening member body 131 for fastening the first heat insulating box 110 and the second heat insulating box 120 and the fastening member body 131 to prevent the fastening member body 131 from falling out in the opposite direction of the fastening direction. It includes a projection 132 to.

As shown in FIG. 2, the fastening member body 131 of the fastening member 130 includes a horizontal unit member 131a and a bending unit member 131b which is extended and bent at both ends of the horizontal unit member 131a, respectively. Includes, in the present embodiment, the fastening member body 131 may be manufactured in a shape standing "c".

As shown in FIG. 2, the protrusions 132 of the fastening member 130 may be provided in plurality, and may be spaced apart from each other and may have a triangular cross-sectional shape. Providing a plurality of the projections 132 as shown in this embodiment, but disposed to be spaced apart from each other there is an advantage that can widen the thickness selection width of the first insulation box 110 and the second insulation box 120. That is, when the gap between the plurality of spaced protrusions 132 is manufactured in accordance with the specifications of the first insulation box 110 and the second insulation box 120, the insulation box having various thicknesses with one fastening member 130 Can be combined.

Meanwhile, in the present embodiment, the fastening member 130 may be fastened to the first heat insulating box 110 and the second heat insulating box 120 by a staple gun (not shown).

4 is a view schematically showing a state of use of the insulating box for cargo holds of LNG ships according to an embodiment of the present invention.

Insulation box 1 for cargo holds of LNG ships according to the present embodiment, as shown in Figure 4, both the primary insulation box 100 and the secondary insulation box 200 can have a multi-layered structure, both Only one of them may have a multilayer structure. In addition, a primary sealing wall M1 and a secondary sealing wall made of Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm are disposed on the upper sides of the primary insulating box 100 and the secondary insulating box 200. M2 is provided respectively.

This embodiment is unlike the embodiment of the prior art having a single-layer structure by the primary insulation box 100 and the secondary insulation box 200 having such a multi-layer structure can ensure the stability of the vessel structurally and the insulation box It can improve the strength of and prevent the occurrence of buckling caused by external force (bent when a long structural member such as a column is pressed in the direction of the length).

In addition, it is possible to increase the height of the insulation box to improve the insulation, so that the BOR (Boil Off Rate) of the liquefied natural gas can be lowered to 0.15% or less, and can be conveniently combined by the fastening member 130 to be described later. There is an advantage.

Although not shown, the present exemplary embodiment does not provide the above-described first ceiling portion 113 and the second bottom portion 121, respectively, but the first ceiling portion 113 and the second ceiling layer are formed by a single-layer interlayer member (not shown). The bottom portion 121 may be provided integrally. This does not require the use of the fastening member 130 while maintaining the appropriate strength has the advantage that the operation becomes simpler.

5 is a view showing a method for manufacturing a heat insulation box for cargo hold of an LNG ship according to another embodiment of the present invention.

This embodiment is also described on the basis of the manufacturing method of the primary insulation box 100 for convenience of description as described above.

First, FIGS. 5A to 5C illustrate a method of manufacturing the first heat insulation box 110. A first bottom part 111 is prepared and a plurality of upper parts of the first bottom part 111 are provided. The first side wall portion 112 is coupled. Next, the plurality of first partitioning members 114 are coupled to the first bottom portion 111 and the plurality of first sidewall portions 112 to form partitioned spaces. Next, the first heat insulating box 110 is completed by coupling the first ceiling part 113 provided with the plurality of first communication holes 113a to the plurality of first side wall parts 112 and the plurality of partition members.

Next, as shown in FIG. 5D, a second bottom portion 121 having a plurality of second communication holes 121a is prepared, and the upper portion of the second bottom portion 121 is illustrated in FIG. 5. As shown in (e), the plurality of second sidewall portions 122 are coupled.

Next, as illustrated in FIG. 5F, the plurality of second partition members 124 are coupled to the second bottom 121 and the plurality of second sidewalls 122, and then the plurality of second partitions 124 are coupled to each other. Using the fastening member 130, as shown in FIG. 5G, the first heat insulation box 110, the plurality of second side wall portions 122, and the plurality of second partition members 124 are coupled to each other. The second bottom portion 121 is coupled to each other. In the present embodiment, the fastening member 130 may be fastened to the first heat insulating box 110 and the second heat insulating box 120 by a staple gun.

Thereafter, although not shown, a powder-type heat insulating member, such as pearlite, is formed by the first communication hole 113a and the second communication hole 121a. Fill in the insulation box (120).

Finally, when the filling of the powder-type heat insulating member is completed, as shown in FIG. 5 (h), by combining the second ceiling portion 123, as shown in (e) of FIG. 5, the first heat insulating box 110 Finishes the production work.

It will be apparent to those skilled in the art that various modifications and variations can be made in the present invention without departing from the spirit or scope of the invention. Accordingly, such modifications or variations are intended to fall within the scope of the appended claims.

1: Insulation box for cargo hold of LNG ship 100: 1st insulation box
110: first insulation box 111: first bottom portion
112: first side wall portion 113: first ceiling portion
114: first partition member 120: second insulation box
121: second bottom portion 122: second side wall portion
123: second ceiling 124: second partition member
130: fastening member 131: fastening member body
132: protrusion 200: secondary insulation box
H: inner wall of the hull

Claims (14)

In the insulation box for cargo hold of LNG ship comprising a secondary insulation box and a primary insulation box which is sequentially provided from the inner wall of the hull between the storage tank in which the LNG is stored and the inner wall of the hull,
At least one of the primary insulation box and the secondary insulation box,
It has a multi-layered structure by laminating two or more insulating boxes together.
Insulating box for cargo hold of LNG ship comprising a fastening member for fastening the two or more insulating boxes to each other, but is held in the fastening area and does not fall in the reverse direction of the mutual fastening. The method according to claim 1,
At least one of the primary insulation box and the secondary insulation box,
First insulation box; And
It includes a second heat insulating box is laminated to each other by the first heat insulating box and the fastening member,
The insulation box for the cargo hold of the LNG ship, characterized in that a plurality of communication holes for communicating the first insulation box and the second insulation box are provided in the laminated coupling region of the first insulation box and the second insulation box. The method according to claim 2,
The first heat insulation box and the second heat insulation box is a cargo box insulation box for an LNG ship comprising a plurality of partition members for partitioning each of the inner space. The method according to claim 3,
A plurality of partition members provided in the first heat insulating box and a plurality of partition members provided in the second heat insulating box are arranged so as to cross each other. The method according to claim 1,
The fastening member
A fastening member body having a horizontal unit member and a bending unit member which is bent and extended at both ends of the horizontal unit member, respectively; And
Insulation box for cargo hold of LNG ship comprising a protrusion provided in each of the bending unit member. The method according to claim 5,
The protrusion is provided with a plurality of insulation boxes for cargo hold of an LNG ship, characterized in that spaced apart from each other between the protrusions. The method according to claim 5,
The protrusion is a cargo box insulation box of an LNG ship, characterized in that it has a triangular cross-sectional shape. The method according to claim 1,
Insulation box for cargo hold of the LNG ship is an insulation box for cargo hold of an LNG ship, characterized in that arranged in the side wall portion of the storage tank. In the manufacturing method of the insulation box for cargo holds of LNG ships,
Forming a plurality of communication holes in a stacking area of each one of the at least one heat insulation box and the other heat insulation box stacked on each other; And
Method of manufacturing an insulation box for cargo hold of an LNG ship comprising the step of fastening the one heat insulation box and the other heat insulation box using a fastening member. The method according to claim 9,
Method of producing a thermal insulation box for cargo hold of an LNG ship further comprising the step of filling a powder-type insulating member in the one of the insulation box and the other insulation box. The method of claim 10,
The one of the insulating box is sealed in the inner space,
The other one of the insulating box is open in one direction for the fastening of the fastening member,
The method of manufacturing an insulation box for cargo hold of an LNG ship further comprising the step of sealing the open space of the other one insulation box. The method according to claim 9,
The fastening member
A fastening member body having a horizontal unit member and a bending unit member which is bent and extended at both ends of the unit horizontal member, respectively; And
And a protrusion provided on each of the bending unit members, and supported by the fastening area of the heat insulation box, so as not to fall out in a reverse direction of the mutual fastening direction. The method according to claim 9,
The method of manufacturing a thermal insulation box for cargo hold of an LNG ship further comprising the step of providing a plurality of partition members in the one insulation box and the other insulation box. In the insulation box for cargo hold of LNG ship,
The insulation box has a multi-layer structure by an interlayer member partitioning the internal space into a multi-layer, the interlayer member is a cargo box insulation box for an LNG ship, characterized in that provided in a single layer.

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