KR101215537B1 - Insulation structure of tank for storing lng - Google Patents

Abstract

An insulation structure of a liquefied natural gas storage tank is disclosed.
The insulation structure of the LNG storage tank according to an embodiment of the present invention includes a lower insulation panel installed in plurality for insulation of the storage tank, a first barrier member installed on an upper surface of each lower insulation panel, and a lower insulation panel. And a second barrier member installed to overlap the first barrier member on an upper surface of the adjacent portion of the first barrier member, and a coupling part for allowing the second barrier member to be mechanically coupled to the overlapping portion of the first barrier member.

Description

INSULATION STRUCTURE OF TANK FOR STORING LNG

The present invention relates to an insulation structure, and more particularly, to an insulation structure of a LNG storage tank.

In general, liquefied natural gas (Liquefied Natural Gas, LNG) refers to a colorless transparent cryogenic liquid whose natural gas, which contains methane (methane), is cooled to -162 ° C and its volume is reduced to one hundredth.

As such liquefied natural gas is used as an energy resource, an efficient transportation method for transporting a large amount from the production base to the demand site has been considered to use this gas as energy. LNG carriers have been developed that can be transported by air.

By the way, the LNG carrier should be provided with a cargo (cargo) that can store and store the liquefied natural gas liquefied in a cryogenic state, there were 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 -162 ℃, the cargo hold for storing and storing such LNG is a material that can withstand ultra low temperatures, for example For example, aluminum, stainless steel, 35% nickel steel, etc. In addition, it had to be designed with an insulation structure that is resistant to other thermal stresses and heat shrinkages and can block thermal intrusion.

Referring to the cargo hold insulation structure of a conventional LNG carrier with reference to the accompanying drawings as follows.

1 is a cross-sectional view showing a cargo hold insulation structure of a liquefied natural gas carrier according to the prior art. As illustrated, the bottom insulation panel 10 is fixed to the inner surface of the hull 1 of the LNG carrier by an epoxy mastic 13 and a stud bolt 14. It is attached and fixed via 10a).

At this time, a rigid triplex 22 is interposed between the lower insulation panel 10 and the upper insulation panel 20 to be bonded to each other. Meanwhile, when attaching the lower insulation panel 10 to the cargo hold wall, the lower insulation panel 10 may be inserted into a gap 40 formed of glass wool flat joints 18. ) Have a gap.

The top bridge panel 28 is then attached between the upper insulation panels 20, with a supple triplex 26 as an epoxy glue 24 on the rigid triplex 22 that is already attached. ), And the top bridge panel 28 is attached using the epoxy glue 24 thereon.

And the upper insulation panel 20 and the top of the top bridge panel 28 has the same plane, the corrugated membrane (30: corrugated membrane) attached to the same plane through the anchor strip 33 through the cargo hold The wall is completed.

Here, the method of assembling the inner surface of the hull 1 and the lower insulation panel 10 of the LNG carrier further includes attaching the stud bolts 14 to the inner wall of the hull 1 by resistance welding, and insulating the lower insulation. The panel 10 is pre-formed with holes into which the stud bolts 14 can be inserted.

Therefore, the assembly is completed by fastening the nut 14a to the stud bolt 14 and inserting the cylindrical foam plug 15 into the hole formed in the lower insulation panel 10.

The cargo hold insulation structure of the conventional LNG carrier has a primary barrier and a secondary barrier to prevent the LNG from contacting the hull 1, which is a rigid triplex 22 and a triple triplex. The secondary barrier is formed by a bonding system using a glue, and uses triplex as a material.

However, when using the triplex as a secondary barrier, the bonding surface is made of glass cloth, so that over time, the porosity can continuously increase, the bonding surface can be separated, and the installation and maintenance And it had a problem that takes a lot of time and money to repair.

Embodiments of the present invention seek to increase the durability of the secondary barrier by preventing the secondary barrier from increasing porosity due to heat shrinkage.

In addition, the secondary barrier is to be mechanically connected to reduce the time and cost of installation and repair.

In addition, when the primary barrier is damaged, it is intended to strengthen the secondary barrier by using head pressure.

According to an aspect of the present invention, in an insulation structure of a liquefied natural gas storage tank, the lower insulation panel is installed in plurality for the thermal insulation of the storage tank, and the first barrier member is installed on each upper surface of the lower insulation panel; And a second barrier member disposed to overlap the first barrier member on an upper surface of adjacent portions of the lower insulation panels, and a coupling part for allowing the second barrier member to be mechanically coupled to an overlapping portion of the first barrier member. The coupling part may include a fastening member penetrating the second barrier member and fastened to the first barrier member.

The apparatus may further include a gasket installed between the first and second barrier members.

In addition, the gasket may be made of Gore-Tex.

In addition, the second barrier member may further include a connecting portion to be horizontally overlapped by the first and the second inclined surface formed to be inclined to face each other overlapping each other.

In addition, the second barrier member may further include a connecting portion to be horizontally overlapped by the first and second locking projections respectively formed to face the overlapping portion.

In addition, the first or second barrier member may be made of plywood or composite material.

In addition, the second barrier member may have an opening formed in a longitudinal direction.

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The coupling part may further include a packing member installed between the fastening member and the second barrier member, and a washer installed between the packing member and the fastening member.

In addition, the coupling part may be formed in the second barrier member to be a locking projection to be caught on the first barrier member.

Embodiments of the present invention can increase the durability of the secondary barrier by preventing the secondary barrier from increasing porosity due to heat shrinkage, and the first barrier member and the second barrier member forming the secondary barrier are mechanically connected to each other. This reduces the time and cost of installation and maintenance. In addition, when the primary barrier is damaged, the head pressure can be used to strengthen the secondary barrier.

1 is a cross-sectional view showing the insulation structure of the LNG carrier cargo hold according to the prior art,
2 is an exploded perspective view showing an insulation structure of a liquefied natural gas storage tank according to a first embodiment of the present invention,
3 is an assembled perspective view showing the insulation structure of the liquefied natural gas storage tank according to the first embodiment of the present invention,
Figure 4 is a cross-sectional view showing an example of the connecting portion in the insulation structure of the LNG storage tank according to the present invention,
5 is a cross-sectional view showing another example of the connecting portion in the insulation structure of the LNG storage tank according to the present invention,
6 is a perspective view showing an insulation structure of a liquefied natural gas storage tank according to a second embodiment of the present invention,
7 is a perspective view showing an insulation structure of a liquefied natural gas storage tank according to a third embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the following description of the present invention, detailed description of known functions and configurations incorporated herein will be omitted when it may make the subject matter of the present invention rather unclear.

2 and 3 are an exploded perspective view and an assembled perspective view showing the insulation structure of the liquefied natural gas storage tank according to the first embodiment of the present invention.

2 and 3, the insulation structure 100 of the LNG storage tank according to the first embodiment of the present invention includes a plurality of lower insulation panels 110 and an upper surface of the lower insulation panel 110. The first barrier member 120, the second barrier member 130 installed to overlap the first barrier member 120, and the first barrier member 120 and the second barrier member 130. It may include a coupling portion 140 for coupling to. On the other hand, the insulation structure 100 of the liquefied natural gas storage tank according to the present invention can be applied to all tanks for storing the liquefied natural gas, for example can be applied to the cargo hold of the liquefied natural gas carrier.

The lower insulation panel 110 may be installed in a plurality of insulation tanks for liquefied natural gas for insulation. The lower insulation panel 110 may be installed on the inner surface of the hull by means of epoxy mastic and stud bolts. Can be attached.

The first barrier member 120 is formed in plural and installed on the upper surface of each of the lower insulation panels 110, and the upper insulation panel 170 is fixed to the upper side.

The second barrier member 130 is installed to overlap the first barrier member 120 on the upper surface of the adjacent portions of the lower insulation panels 110, thereby covering the gaps of the lower insulation panels 110.

The first and second barrier members 120 and 130 can withstand the cryogenic temperatures of liquefied natural gas, have a relatively low heat shrinkage compared to metals or thermal insulation materials, and have sufficient strength at low temperatures, for example, plywood ) Or a composite material.

A gasket 150 may be installed between the first and second barrier members 120 and 130. Here, the gasket 150 may maintain the liquid tightness of the secondary barrier. The gasket 150 may be made of a material, such as a gore-tex, that can withstand cryogenic temperatures between the first and second barrier members 120 and 130 that are mechanically coupled by the coupling part 140. When the barrier is broken, the first and second barrier members 120 and 130 are more tightly coupled due to the head pressure.

Here, as shown in FIG. 4, when the second barrier member 130 overlaps with the other second barrier member 130, the second barrier member 130 may be horizontally overlapped by the connection unit 160. Here, the connecting portion 160 may include first and second inclined surfaces 161 and 162 which are formed to be inclined to face portions where the second barrier member 130 overlaps with each other, as in the present embodiment. And the second inclined surfaces 161 and 162 overlap each other to allow the second barrier member 130 to horizontally overlap with the other second barrier member 130.

In addition, as shown in FIG. 5, the connection part 160 may include, as another embodiment, first and second locking projections 163 and 164 respectively formed to face portions where the second barrier members 130 overlap each other. The second barrier member 130 may overlap horizontally with the other second barrier member 130 by overlapping the first and second locking jaws 163 and 164 facing each other.

Meanwhile, the gasket 150 may be installed between the second barrier members 130 connected to each other by the connection unit 160.

As shown in Figure 2 or 3, the coupling portion 140 is made of a plurality so that the second barrier member 130 is mechanically coupled to the overlapping portion with the first barrier member 120, the second barrier member ( The first and second barrier members 120 and 130 may be mechanically coupled to each other by being fastened at predetermined intervals along both sides or edges of the 130. For example, the coupling part 140 penetrates the through-hole 131 of the second barrier member 130 and the through-hole 151 of the gasket 150 to be formed in the first barrier member 120. It may include a fastening member 141 fastened to the fastening groove. Here, the fastening member 141 may be used, for example, bolts or rivets. In addition, the coupling part 140 may include a packing member 142 installed between the fastening member 141 and the second barrier member 130, and a washer installed between the packing member 142 and the fastening member 141. 143). Therefore, the packing member 142 installed between the washer 143 and the second barrier member 130 prevents leakage of liquefied natural gas. Here, the packing member 142 may be made of a gore-tex like the gasket 150.

6 is a perspective view showing an insulation structure of a liquefied natural gas storage tank according to a second embodiment of the present invention. As shown in FIG. 6, the insulation structure 200 of the LNG storage tank according to the second embodiment of the present invention includes the first and second barrier members 220 that are mechanically coupled by the coupling part 240. The gasket 250 is installed between the 230 and the opening 231 may be formed in the second barrier member 230 along the longitudinal direction. The opening 231 may be formed to exclude a portion of the second barrier member 230 that is coupled by the coupling part 240. In the insulation structure of the liquefied natural gas storage tank according to the second embodiment of the present invention, a coupling part may be included as in the first embodiment, and the same coupling part as that of the first embodiment may be used.

7 is a perspective view showing an insulation structure of a liquefied natural gas storage tank according to a third embodiment of the present invention. As illustrated in FIG. 7, in the insulation structure 300 of the liquefied natural gas storage tank according to the third embodiment of the present invention, the coupling part 340 is formed on the second barrier member 330 to form the first barrier member ( It may be made of a locking projection caught on 320). Here, the locking protrusion may be formed in a plurality so as to protrude downward along both sides or the edge of the second barrier member 330, it may be manufactured in a sawtooth shape. In addition, the gasket 350 may be installed between the first barrier member 320 and the second barrier member 330, and the locking protrusion may be inserted into the first barrier member 320 through the gasket 350. According to the engaging portion 340 made of a locking projection, the first and second barrier members 320 and 330 by using the property of tightening tightly by pulling the first barrier member 320 together when the second barrier member 330 is heat contracted. To be mechanically coupled.

Referring to the operation of the insulation structure of the LNG storage tank according to the present invention having such a configuration as an example.

As shown in FIG. 3, the first and second barrier members 120 and 130 are mechanically coupled by the coupling part 140 to form a secondary barrier, thereby preventing damage to the secondary barrier and installing the secondary barrier. And the time and effort required for repair can be minimized.

In addition, the gasket 150 is installed between the first and second barrier members 120 and 130 so that there is no change in porosity due to heat shrinkage, and when the primary barrier is damaged, the secondary barrier can be more firmly used by using head pressure. It may be, it is possible to prevent the leakage of the liquefied natural gas through the coupling portion 140 by the packing member 142 installed in the coupling portion 140.

As shown in FIGS. 4 and 5, the second barrier member 130 is connected to the second barrier member 130 by horizontally overlapping by the connecting portion 160 when the second barrier member 130 is connected to the second barrier member 130. While making it easy to work, it is possible to prevent the leakage of liquefied natural gas.

As shown in FIG. 6, the opening 231 is formed in the second barrier member 230 to facilitate the installation of the second barrier member 230 and to effectively cope with heat shrinkage.

As shown in FIG. 7, the coupling part 340 is formed on the second barrier member 330 to be caught by the first barrier member 320 to facilitate the assembly of the second barrier member 300. Due to the property that the first and second barrier members 320 and 330 are tightened more tightly during heat shrinkage, the bonding force between the first and second barrier members 320 and 330 may be increased.

While the present invention has been described in connection with what is presently considered to be practical exemplary embodiments, it is to be understood that the invention is not limited to the disclosed embodiments, but, on the contrary, You will understand. For example, a person skilled in the art can change the material, size and the like of each constituent element depending on the application field or can combine or substitute the embodiments in a form not clearly disclosed in the embodiment of the present invention, Of the range. Therefore, it should be understood that the above-described embodiments are to be considered in all respects as illustrative and not restrictive, and that such modified embodiments are included in the technical idea described in the claims of the present invention.

110: lower insulation panel
120,220,320: first barrier member
121: through hole
130,230,330: second barrier member
131: through hole
140,240,340: coupling part
141: fastening member
142: packing member
143: Washer
150,250,350: Gasket
151: through hole
160: connection
161: first inclined surface
162: second inclined surface
163: first jamming jaw
164: second jamming jaw
170: upper insulation panel
231 opening

Claims (11)

A lower insulation panel installed in plurality for insulation of the LNG storage tank;
A first barrier member installed on an upper surface of each of the lower insulation panels;
A second barrier member disposed on an upper surface of an adjacent portion of the lower insulation panels so as to overlap the first barrier member;
A coupling part for mechanically coupling the second barrier member to an overlapping portion of the first barrier member,
The coupling part includes a fastening member penetrating the second barrier member and fastened to the first barrier member.
Insulation structure of LNG storage tank.
The method of claim 1,
And a gasket installed between the first and second barrier members.
Insulation structure of LNG storage tank.
The method of claim 2,
The gasket is made of Gore-Tex
Insulation structure of LNG storage tank. The method according to claim 1 or 2,
The second barrier member further comprises a connecting portion for horizontally overlapping by the first and second inclined surfaces formed to be inclined so as to face the overlapping portion each other.
Insulation structure of LNG storage tank.
The method according to claim 1 or 2,
It further comprises a connecting portion for horizontally overlapping by the first and second locking jaw formed to face the second barrier member overlap each other overlapping each other;
Insulation structure of LNG storage tank.
The method according to claim 1 or 2,
The first barrier member is made of plywood or composite material
Insulation structure of LNG storage tank.
The method according to claim 1 or 2,
The second barrier member is made of plywood or composite material
Insulation structure of LNG storage tank.
The method of claim 2,
The second barrier member has an opening formed in the longitudinal direction
Insulation structure of LNG storage tank.
delete The method of claim 1,
The coupling portion
A packing member installed between the fastening member and the second barrier member;
Further comprising a washer installed between the packing member and the fastening member
Insulation structure of LNG storage tank.
The method according to claim 1 or 2,
The coupling portion
A locking protrusion formed on the second barrier member and caught by the first barrier member;
Insulation structure of LNG storage tank.

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