KR101571428B1 - Tank - Google Patents

Abstract

The cargo hold is initiated. According to an embodiment of the present invention, a cargo hold body is disposed at a predetermined distance from a hull and stores a cryogenic fluid; An inner insulating layer including a primary barrier disposed inside the body and in contact with the fluid, and an inner insulating board interposed between the body and the primary barrier; And an external insulating layer provided outside the body.

Description

Cargo hold {TANK}

The present invention relates to a cargo hold.

Conventional liquefied natural gas (LNG) storage tanks are largely divided into two types: a membrane-type cargo hold (GTT MARK III or NO 96-2) that is constructed integrally with the hull and a stand-alone cargo hold (SPB or MOSS).

In the case of a membrane type cargo hold, the primary barrier, the upper insulation board, the secondary barrier and the lower insulation board are sequentially combined. This is to prevent further leakage of the fluid in the secondary barrier if there is a small leakage of the cryogenic fluid in the primary barrier. The process of installing a barrier in a cargo hold typically involves fixing a plurality of lower insulation boards having the same thickness on the inner wall of the cargo hold, installing a secondary barrier on the lower insulation board, installing an upper insulation board and a primary barrier on top of the secondary barrier . At this time, in a state where the lower heat insulating board, the secondary wall and the upper heat insulating board are joined to the inner wall of the cargo hold adjacent to each other, the space between the upper part of the main secondary wall and the upper heat insulating board A secondary barrier and a connection board may be installed, and a primary barrier may be provided above the upper insulation board. In this regard, Korean Patent Laid-Open Publication No. 2012-0120800 (published on November 2, 2012) discloses a technique relating to a heat insulating structure of a membrane type cargo hold.

In the case of a stand-alone cargo hold, the cryogenic fluid is stored directly in the independent structure without insulation, and the insulation is installed outside the structure to provide the cooling performance. At this time, the structure acts as a primary barrier and a partially installed drip tray acts as a secondary barrier to protect the hull. In this regard, Korean Unexamined Patent Publication No. 2012-0051927 (published May 23, 2012) discloses a technique for a stand-alone cargo hold.

However, the secondary barrier of the above-described membrane-type cargo hold is constructed by bonding or welding, which is technically very difficult, requires a long time, and may be difficult to perform because of difficulty in inspection process. This can result in problems with cargo hold quality.

In the case of a stand-alone cargo hold, the structure must be made of stainless steel or aluminum because the structure is in direct contact with the cryogenic fluid, and the auxiliary structure for preventing the sloshing phenomenon may be installed.

Korean Public Patent No. 2012-0120800 (published on November 2, 2012) Korean Public Patent No. 2012-0051927 (published on May 23, 2012)

Embodiments of the present invention provide a cargo hold that can provide a simple and lightweight barrier structure because the cargo hold body functions as a secondary barrier.

In addition, since the second barrier construction step is not required in comparison with the conventional membrane cargo hold, it is possible to solve the difficulty in the construction and inspection of the second barrier and to confirm the quality through various inspections during the manufacture of the cargo hold body. And to provide a cargo hold capable of enhancing reliability.

In addition, an internal reinforcement structure for suppressing sloshing is not required compared with a conventional stand-alone type cargo hold, and a cargo window that can be constructed with a lightweight structure is provided.

According to an aspect of the present invention, there is provided a cargo hold comprising: a cargo hold body disposed at a predetermined distance from a hull and storing a cryogenic fluid; An inner heat insulating layer disposed inside the body and including a primary barrier contacting the fluid, and an inner heat insulating board interposed between the body and the primary barrier; And an external heat insulating layer disposed outside the body.

And a plurality of support structures installed on the inner bottom surface of the hull to support the body.

Further comprising: a moving block movably mounted on a depressed portion of the supporting structure; and a fixing block installed at a step formed at an upper end of the supporting structure to prevent the moving block from deviating in a vertical direction, A protrusion inserted into the insertion groove of the moving block is formed and the moving block is horizontally moved when the fluid expands and contracts.

A first shock absorbing layer interposed between the body and the inner heat insulating board to buffer the sloshing impact force by the fluid and a second shock absorbing layer interposed between the inner heat insulating board and the primary wall And at least one of the first shock absorbing layer and the second shock absorbing layer may be made of at least one of a glass fiber mat and an elastic material retaining an elastic force at a low temperature.

Wherein the inner heat insulating board includes an inner heat insulating member, an inner board upper protective plate disposed on the inner heat insulating member, and an inner board lower protective plate interposed between the body and the inner heat insulating member, One or more of the inner board bottom shields may be made of plywood.

Wherein the external heat insulating layer includes an external heat insulating member, an external board upper protective plate interposed between the body and the external heat insulating member, and an external board lower protective plate disposed under the external heat insulating member, One or more of the bottom shields may comprise a panel, a box type of insulation, or an insulating foam that is applied in a spray manner.

The body may be made of the same material as the primary barrier or may be made of one or more of aluminum, stainless steel, glass fiber and metal composite, concrete and metal composite.

And a reinforcing member inserted into the corrugation of the primary barrier to prevent deformation of the corrugation, wherein the reinforcing member includes a passage portion convexly formed at a central portion thereof, and a flat portion extended from both sides of the passage portion, And a plurality of spaced-apart spacers disposed on the upper surface of the cavity support in a radial fashion corresponding to the shape of the corrugation, And a curved plate formed at an end of each of the support plates in the longitudinal direction of the support plate and having a portion facing the corrugation corresponding to the curved surface of the corrugation, And a reinforcing support portion of the reinforcing member.

A first pipe installed in a space formed between the body and the primary barrier, a second pipe installed in a space formed between the body and the external heat insulating layer, the first pipe extending to the outside of the cargo hold, And a gas detection sensor for detecting the flow of methane gas by extracting gas from the communicating portion of the pipe using a pump.

A collecting vessel interposed between the hull and the outer heat insulating layer to collect the fluid leaking through the body; and a heat exchanger installed on an inner bottom surface of the hull to support the collecting vessel, A fluid transport passage may be formed in the lower portion of the body so that the fluid leaking through the body flows toward the collection container.

Since the cargo hold body according to the embodiment of the present invention plays the role of the secondary barrier, it is possible to provide a simple and lightweight barrier structure.

In addition, since the second barrier construction step is not required in comparison with the conventional membrane cargo hold, it is possible to solve the difficulty in the construction and inspection of the second barrier and to confirm the quality through various inspections during the manufacture of the cargo hold body. The reliability can be enhanced.

In addition, since an internal reinforcing structure for suppressing sloshing is not required compared to a conventional stand-alone type cargo hold, it is possible to construct a structure with a lightweight structure.

The effects of the present invention are not limited to the effects mentioned above, and other effects not mentioned can be clearly understood by those skilled in the art from the description of the claims.

BRIEF DESCRIPTION OF THE DRAWINGS Figure 1 is a cross-sectional view of a vessel cargo hold according to an embodiment of the present invention.
2 is a partial cross-sectional view showing a barrier structure of the cargo hold shown in FIG.
3 is a cross-sectional view of the support structure of the cargo hold shown in Fig.
4 is a perspective view of a reinforcing member inserted into the inside of the corrugation of the primary barrier of the cargo hold shown in Fig. 1 to prevent deformation of the corrugation.
5 is a cross-sectional view showing a structure for detecting whether or not the gas in the cargo hold is leaked out as shown in FIG.
Figs. 6 and 7 are cross-sectional views showing a leakage liquid collecting apparatus for collecting leaked fluid in the cargo hold shown in Fig. 1. Fig.

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, but 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.

1 and 2, a vessel holding vessel 100 for storing a cryogenic fluid according to an embodiment of the present invention includes a cargo hold body 101 disposed at a predetermined distance from the ship 10 to store cryogenic fluid, An external heat insulating layer 120 disposed outside the body 101, and a support structure 130. The external heat insulating layer 120 is disposed inside the body 101,

The body 101 stores a cryogenic fluid as an integral tank structure having a hexahedral surface, an arm surface, and the like. The body 101 may be made of the same material as the primary barrier 115 to be described later or may be made of one or more of aluminum, stainless steel, glass fiber and metal material composite, concrete and metal material composite. The stiffener 102 for reinforcing the structural strength of the body 101 may be extended outside the body 101.

The inner heat insulating layer 110 includes a primary barrier 115 installed inside the body 101 and in direct contact with the cryogenic fluid and an internal heat insulating board 113 interposed between the body 101 and the primary barrier 115 do. The primary barrier 115 may be made of a metal material such as stainless steel (SUS) or the like. In addition, the primary barrier 115 can be made of a material resistant to low-temperature brittleness such as aluminum alloy, Invar, and 9% nickel steel. The primary barrier 115 has a corrugated shape 115a (see FIG. 4) in a corrugated shape and a joint 115b (see FIG. 4) which is a welded portion. For example, the corrugation 101 may have a semi-circular cross-sectional shape.

The inner heat insulating board 113 includes an inner heat insulating member 113a, an inner board upper protective plate 113b disposed on the upper portion of the inner heat insulating member 113a, and an inner board lower portion 113b interposed between the body 101 and the inner heat insulating member 113a. And a protective plate 113c. The inner heat insulating member 113a is made of a polyurethane foam (PUF), a reinforced polyurethane foam (R-PUF), or the like to protect the hull from a fluid at a cryogenic temperature. The inner board upper protection plate 113b and the inner board lower protection plate 113c may be made of a material such as plywood.

The inner heat insulating layer 110 includes a first shock absorbing layer 111 interposed between the body 101 and the inner heat insulating board 113 and an inner heat insulating board 113 and a primary barrier wall And a second shock absorbing layer 114 interposed between the first and second shock absorbing layers 114 and 115. The first shock absorbing layer 111 and the second shock absorbing layer 114 may be made of at least one of a glass fiber mat and an elastic material that maintains an elastic force at a low temperature. For example, the first and second impact-absorbing layers 111 and 114 may be made of melamine foam as a foam material. Melamine foam is an open type foam based on amino resin type melamine resin, which not only absorbs impact but also has excellent heat insulation performance.

The external insulating layer 120 includes an external insulating member 122a, an external board lower protecting plate 122b under the external insulating member 122a and an external board upper protecting plate 122c interposed between the body 101 and the external insulating member 122a. ). The external heat insulating member 122a and the external board lower protective plate 122b may include a panel, a box type heat insulating material, or a heat insulating foam applied by a spray method. Further, the external heat insulating member 122a may be made of a material having superior heat insulating performance rather than structural strength. For example, a polyurethane foam (PUF) or a polystyrene foam (PS) may be used (in this case, a density of 30 to 40 kg / m 3 is suitably applied) or a vacuum insulation box (VIP, Vacuum Insulation Panel to minimize the heat transfer from the outside to minimize the vaporization of the fluid at the cryogenic temperature. The upper board protection plate 122c of the external board is made of a material such as plywood or glass fiber composite material. And the external board lower protection plate 122b.

A plurality of support structures 130 are provided on the inner bottom surface of the hull 10 to support the body 101. 3 (a), the supporting structure 130 includes a moving block 141 movably mounted on a depression 130a of the supporting structure 130, And a fixing block 142 installed at the fixing portion 142a for preventing the vertical movement of the moving block 141. [

3 (b), the body 101 forms a protrusion 101a to be inserted into the insertion groove 141a of the moving block 141, and when the moving block 141 is expanded and contracted by the cryogenic fluid To be horizontally moved. An adhesive may be applied to the inside of the insertion groove 141a to join the protrusion 101a of the body 101 and the insertion groove 141a.

4 (a) and 4 (b), a reinforcing member 150 inserted inside the corrugation 115a of the primary barrier 115 to prevent deformation of the corrugation 115a is provided . The reinforcing member 150 is disposed inside the corrugation 115a and has an open structure inside the corrugation 115a so as to secure an empty space so that gas flow can be freely performed through the corrugation 115a. The gas may include gas injected for airtightness inspection or water removal of the corrugation 115a. The reinforcing member 150 may be made of the same material as the corrugation 115a or may be made of one or more materials such as nonflammable foam, wood, plywood, polyethylene, polycarbonate, glass fiber reinforced polycarbonate, polyether imide, Lt; / RTI > The reinforcing member 150 may be made of a material having hardness lower than that of stainless steel such as aluminum or brass.

The reinforcement member 150 includes a cavity support 151 and a plurality of reinforcement supports 152. The joint support portion 151 includes a passage portion 151a formed to be convex at a central portion and a flat portion 151b extending from the passage portion 151a to both sides. The passage portion 151a may be formed in the longitudinal direction of the cavity support 151, or may be formed in a polygonal shape as another example. The flat portion 151b may be flat, and both ends of the flat portion 151b may be bent and extended upward to form a semicircular shape with the curved plate 152b, which will be described later.

The reinforcing support portion 152 extends from the cavity support portion 151 to the inner surface of the corrugation 115a and may be spaced apart from the upper surface of the cavity support portion 151 in a radial manner corresponding to the shape of the corrugation 115a. The reinforcing supporter 152 has a plate-like support plate 152a vertically arranged at a predetermined interval at the upper end of the passage 151a and a support plate 152b at the end of each support plate 152a in the longitudinal direction of the support plate 152a. And a portion facing the corrugation 115a includes a curved plate 152b formed corresponding to the curved surface of the corrugation 115a.

5, the above-described cargo hold 100 includes a first pipe P1 installed in a space formed between the body 101 and the primary barrier 115 and a second pipe P1 installed between the body 101 and the external heat insulating layer 120 (Not shown) from the communicating portion of the first pipe P1 and the second pipe P2 extending to the outside of the cargo hold to generate a methane gas A gas detection sensor 160 may be provided to detect whether the gas flows out.

6 and 7, the cargo hold 100 described above includes a collection container 171 interposed between the hull 10 and the external heat insulating layer 120 to collect the fluid leaking through the body 101, And a vessel support 172 provided on the inner bottom surface of the hull 10 for supporting the collector vessel 171 and made of a heat insulating material so as to prevent heat transfer between the collector vessel 171 and the hull 10 A leakage liquid collecting device 170 may be provided. Here, the fluid passage 105 may be formed below the body 101 so that the fluid leaking through the body 101 flows toward the collection container 171.

The foregoing has shown and described specific embodiments. However, it is to be understood that the present invention is not limited to the above-described embodiment, and various changes and modifications may be made without departing from the scope of the technical idea of the present invention described in the following claims It will be possible.

100: Cargo hold 101: Body
110: inner heat insulating layer 120: outer heat insulating layer
130: support structure 141: moving block
142: fixed block 150: reinforcing member
160: Gas detection sensor 170: Leakage collecting device

Claims (10)

A cargo hold body disposed at a distance from the hull to store the cryogenic fluid;
An inner heat insulating layer disposed inside the body and including a primary barrier contacting the fluid, and an inner heat insulating board interposed between the body and the primary barrier;
An outer insulating layer provided outside the body;
A plurality of support structures installed on the inner bottom surface of the hull to support the body;
A moving block movably seated in a depression of the support structure; And
And a fixing block installed at a step formed at an upper end of the supporting structure to prevent vertical deviation of the moving block,
Wherein the body forms a protrusion to be inserted into the insertion groove of the moving block and allows the moving block to move horizontally when the fluid expands and contracts. delete delete The method according to claim 1,
A first shock absorbing layer interposed between the body and the inner heat insulating board to buffer the sloshing impact force by the fluid,
Further comprising at least one of an inner heat insulating board and a second shock absorbing layer interposed between the inner heat insulating board and the primary wall,
Wherein at least one of the first shock absorbing layer and the second shock absorbing layer is made of at least one of a glass fiber mat and an elastic material that maintains an elastic force at a low temperature. The method according to claim 1,
The inner heat insulating board
An inner heat insulating member,
An inner board upper protection plate disposed above the inner heat insulating member,
And an inner board lower protection plate interposed between the body and the inner heat insulating member,
Wherein at least one of the inner board upper protection plate and the inner board lower protection plate is made of plywood. The method according to claim 1,
Wherein the external heat insulating layer comprises an external heat insulating member,
An outer board upper protection plate interposed between the body and the outer heat insulating member,
And an external board lower protection plate disposed below the external heat insulating member,
Wherein at least one of the external heat insulating member and the external board lower protecting plate includes a panel, a box type heat insulating material, or a heat insulating foam applied by spraying. The method according to claim 1,
The body may be made of the same material as the primary barrier or may be made of one or more of aluminum, stainless steel, glass fiber and metal composite, concrete and metal composite. The method according to claim 1,
Further comprising a reinforcing member inserted inside the corrugation of the primary barrier to prevent deformation of the corrugation,
Wherein the reinforcing member includes: a passage portion convexly formed at a central portion; a cavity support portion including a flat portion extending from the passage portion to both sides;
A plurality of support portions extending from the cavity support portion toward the inner side of the corrugation and spaced apart from each other on the upper surface of the cavity support portion in a radial shape corresponding to the shape of the corrugation, And a plurality of reinforcing supporters formed at the end of each of the support plates in the longitudinal direction of the support plate and including a curved plate having a portion facing the corrugation corresponding to the curved surface of the corrugation Cargo holds. 9. The method according to any one of claims 1 to 7,
A first pipe installed in a space formed between the body and the primary barrier,
A second pipe installed in a space formed between the body and the outer heat insulating layer,
Further comprising: a gas detection sensor for extracting gas from the communicating portion of the first pipe and the second pipe extending to the outside of the cargo hold by using a pump to detect methane gas leakage. 9. The method according to any one of claims 1 to 7,
A collecting vessel interposed between the hull and the outer heat insulating layer to collect the fluid leaking through the body; and a heat exchanger installed on an inner bottom surface of the hull to support the collecting vessel, Further comprising a leaking liquid collecting device including a container support made of a heat insulating material,
A fluid passageway is formed in the lower portion of the body so that the fluid leaking through the body flows toward the collection vessel.

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