KR20220067236A - An insulation structure and liquefied gas storage tank including the same - Google Patents

Abstract

The present invention is installed on the inner wall of the hull to block heat transfer with the outside, a second insulating wall in which seating grooves are formed at predetermined intervals on the upper surface, and provided on the heat insulating wall, protruding downward to correspond to the seating grooves The secondary sealing wall in which the corrugation is formed, the primary sealing wall is provided in a state spaced apart from the secondary sealing wall, the first corrugated portion protruding upward at a position corresponding to the second corrugation is formed, and is in direct contact with the liquefied gas and a spacer interposed between the primary sealing wall and the secondary sealing wall to maintain a constant distance between the primary sealing wall and the secondary sealing wall.

Description

Insulation structure and liquefied gas storage tank including the same

The present invention relates to an insulating structure and a liquefied gas storage tank including the same, and more particularly, by improving the installation structures of the insulating wall, the secondary sealing wall, the spacer, and the primary sealing wall, the convenience of the sealing wall installation operation is increased. It relates to an insulating structure capable of increasing the sealing reliability of the sealing wall at the same time and to a liquefied gas storage tank including the same.

In general, liquefied natural gas (LNG) is liquefied natural gas, which is one of fossil fuels, and such liquefied natural gas may be stored in a liquefied gas storage tank at a cryogenic temperature of -162°C.

Here, the liquefied gas storage tank is divided into a land storage tank installed on the ground or buried in the ground, or a mobile storage tank installed in a transportation means such as a vehicle or a ship, depending on the location where the liquefied gas storage tank is installed.

In addition, since liquefied natural gas has a risk of explosion upon exposure to impact and is stored in a cryogenic state, a storage tank for storing liquefied natural gas may have a structure in which impact resistance and liquid tightness are firmly maintained.

1 shows a schematic cross-sectional view of a ship 1 in which a liquefied gas storage tank 10 according to the prior art is installed, and FIG. 2 shows an insulating structure of the liquefied gas storage tank 10 according to the prior art.

Referring to FIG. 1 , the vessel 1 on which the liquefied gas storage tank 10 is installed is usually composed of an outer wall 16 forming an outer shape and an inner wall 12 formed inside the outer wall 16 . It has a double structure hull.

In addition, the interior of the hull, that is, the interior of the inner wall 12 may be divided by one or more bulkheads 14, and each internal space divided by the bulkhead 14 is a cryogenic liquid such as liquefied natural gas. It can be used as a storage tank (10).

Here, the inner wall surface of the storage tank 10 is sealed in a liquid-tight state by the sealing wall 30 . That is, the sealing wall 30 forms a single storage space by integrally connecting a plurality of metal plates to each other by welding, and accordingly, the storage tank 10 can store and transport the liquefied natural gas without leakage. do.

A heat insulating wall 20 is arranged to form a heat insulating layer between the sealing wall 30 and the inner wall 12 or the partition wall 14, and the heat insulating wall 20 blocks heat transfer between the outside and the inside of the storage tank. can play a role

Referring to FIG. 2 , the sealing wall 30 is a secondary sealing wall 32 stacked on the heat insulating wall 20, and is installed at a predetermined distance from the secondary sealing wall 32 to liquid-tighten liquefied natural gas. It may include a primary sealing wall 31, and between the primary and secondary sealing walls 31 and 32, a spacer 40 for maintaining a constant distance between the primary and secondary sealing walls 31 and 32. ) can be installed.

Through such a double sealing wall, it is possible to completely seal the liquefied natural gas stored in the storage tank 10 from leaking to the outside.

In addition, wrinkles 33 and 34 may be formed on the primary and secondary sealing walls 31 and 32 that are directly affected by the liquefied natural gas, which is in a cryogenic state, in order to cope with the temperature change according to the loading of the liquefied natural gas. have.

In the construction process of the sealing wall 30 as described above, a secondary sealing wall 32 having a second wrinkle part 34 convexly formed on the upper surface of the normal insulating wall 20 is installed, and the secondary sealing wall 32 is formed. A spacer 40 is installed on the spacer 40, and a hole 41 through which the second wrinkle part 34 passes is formed on the spacer 40, and the second wrinkle part ( 34) may protrude.

In addition, by installing a primary sealing wall 31 having a convex first wrinkle portion 33 formed on the upper surface of the spacer 40 , a secondary sealing wall 31 is provided inside the first corrugation portion 33 of the primary sealing wall 31 . A second corrugated portion 34 of the sealing wall 32 may be disposed, and between the first corrugated portion 33 and the second corrugated portion 34 , the primary sealing wall 31 and the secondary sealing wall ( 32) as much space as the separation distance can be formed.

In this conventional heat insulating structure, the second pleats 34 of the secondary sealing wall 32 are arranged in the inner space of the first pleats 33 of the primary sealing wall 31, so that the first pleats 33 are In order to prevent interference between the and the second wrinkle part 34 , the shapes of the first wrinkle part 33 and the second wrinkle part 34 may be formed differently.

Accordingly, the primary sealing wall 31 and the secondary sealing wall 32 having different shapes of the wrinkle portions 33 and 34 must be separately manufactured and produced, and the sealing wall installation operation is also difficult.

Registered Patent No. 10-0644217 (Registration date: Nov. 2, 2006) "Liquid gas storage tank with improved insulation structure and manufacturing method therefor"

In the present invention, the insulation structure and the liquefied gas storage tank including the same, specifically, by improving the installation structure of the insulation wall, the secondary sealing wall, the spacer and the primary sealing wall constituting the insulation structure of the liquefied gas storage tank, the sealing wall An object of the present invention is to provide an insulating structure capable of increasing the convenience of installation and sealing reliability of the sealing wall, and a liquefied gas storage tank including the same.

The technical problems to be achieved in the present invention are not limited to the technical problems mentioned above, and other technical problems not mentioned will be clearly understood by those of ordinary skill in the art to which the present invention belongs from the description below. will be able

In order to solve the above problems, the present invention is installed on the inner wall of the hull to block heat transfer with the outside, and is provided on the heat insulating wall and the heat insulating wall in which seating grooves are formed at predetermined intervals on the upper surface, and protrudes downward A secondary sealing wall in which a second wrinkled portion to be inserted corresponding to the seating groove is formed, provided in a state spaced apart from the secondary sealing wall, a first wrinkled portion protruding upward at a position corresponding to the second wrinkled portion is formed, , To provide an insulating structure comprising a primary sealing wall in direct contact with the liquefied gas and a spacer interposed between the primary sealing wall and the secondary sealing wall to maintain a constant distance between the primary sealing wall and the secondary sealing wall do.

In addition, the seating groove of the heat insulating wall provides a heat insulating structure in which the outer surface of the second corrugation is formed to be larger than the second corrugation so that the inner surface of the seating groove is spaced apart by a predetermined distance.

In addition, the first sealing wall and the second sealing wall are formed to have the same shape and provide a heat insulating structure provided so that the first and second pleats protrude in opposite directions.

In addition, the heat insulating wall provides a heat insulating structure including a heat insulating material made of a heat insulating material and a protective plate that is respectively coupled to the upper and lower surfaces of the heat insulating material to protect the heat insulating material.

On the other hand, in another aspect of the present invention for solving the above-described problems, there is provided a liquefied gas storage tank including the heat insulating structure of the above-described configuration.

The insulation structure of the liquefied gas storage tank according to an embodiment of the present invention improves the installation structure of the insulation wall, the secondary sealing wall, the spacer, and the primary sealing wall, which are sequentially stacked on the inner wall of the hull, so that the sealing wall installation work is convenient can increase the sealing reliability of the sealing wall at the same time.

In addition, since the corrugations formed on the primary and secondary sealing walls are arranged to protrude in opposite directions, there is no interference between the corrugations of the primary and secondary sealing walls, making it easy to install the sealing wall regardless of the installation tolerance can be done

The effects obtainable in the present invention are not limited to the above-mentioned effects, and other effects not mentioned may be clearly understood by those of ordinary skill in the art to which the present invention belongs from the following description. will be.

1 shows a schematic cross-sectional view of a ship in which a liquefied gas storage tank according to the prior art is installed.
Figure 2 shows a heat insulating structure of the liquefied gas storage tank according to the prior art.
3 is a view showing an insulating structure of a liquefied gas storage tank according to an embodiment of the present invention.
4 is a view showing the insulating wall and the secondary sealing wall separated according to an embodiment of the present invention.
5 is a cross-sectional view showing the shape and installation structure of the primary and secondary sealing walls according to an embodiment of the present invention.

Hereinafter, preferred embodiments according to the present invention will be described in detail with reference to the accompanying drawings.

DETAILED DESCRIPTION The detailed description set forth below in conjunction with the appended drawings is intended to describe exemplary embodiments of the present invention and is not intended to represent the only embodiments in which the present invention may be practiced.

In order to clearly explain the present invention in the drawings, parts not related to the description may be omitted, and the same reference numerals may be used for the same or similar components throughout the specification.

In an embodiment of the present invention, expressions such as “or” and “at least one” may indicate one of the words listed together, or a combination of two or more.

3 is a view showing the insulating structure 100 of the liquefied gas storage tank according to an embodiment of the present invention, Figure 4 is the insulating wall 110 and the secondary sealing wall 120 according to an embodiment of the present invention. is shown separately.

In this embodiment, the insulation structure 100 constituting the wall of the liquefied gas storage tank for storing the liquefied gas will be described.

Here, liquefied gas may be used to encompass all liquefied gas fuels that are generally stored in a liquid state, such as LNG, LPG, ethylene, ammonia, etc., and in this embodiment, the insulating structure of the liquefied gas storage tank for storing LNG gas (100) will be described as an example.

3 and 4, the insulating structure 100 of the liquefied gas storage tank according to an embodiment of the present invention, the insulating wall 110, the secondary sealing wall 120, the primary sealing wall 130 and a spacer 140 .

The insulating wall 110 may be installed on the inner wall of the hull to block heat transfer between the outside and the inside of the storage tank.

Specifically, the heat insulating wall 110 is a heat insulating material 111 made of a heat insulating material such as polymer foam, and a protective plate 112 that is coupled to the upper and lower surfaces of the heat insulating material 111 to protect the heat insulating material 111, respectively. may include

For example, in the present embodiment, the insulating material 111 may be made of polyurethane foam having excellent thermal insulation performance, and the protective plate 112 may be made of plywood having rigidity.

In this way, the heat insulating wall 110 of the form in which the protective plate 112 is coupled to the upper and lower surfaces can be manufactured in a unit with a predetermined area, and a plurality of unit heat insulating walls 110 are arranged to form the overall heat insulating wall 110 inside the storage tank. can be formed

In addition, a plurality of seating grooves 113 may be formed on the upper surface of the heat insulating wall 110 at predetermined intervals.

Here, the seating groove 113 is a groove into which the second wrinkle part 121 of the secondary sealing wall 120 to be described later is inserted correspondingly, and forms a predetermined pattern on the upper surface of the heat insulating wall 110 and is formed at predetermined intervals. can be

As an example, the seating groove 113 may be formed in a semicircular cross-section, and is formed to be larger than the second wrinkle portion 121 of the secondary sealing wall 120 disposed in the seating groove 113, and the seating groove ( 113) and the outer surface of the second wrinkle part 121 may be disposed to be spaced apart from each other by a predetermined distance without being in close contact with each other.

Accordingly, even when the second wrinkle portion 121 disposed in the seating groove 113 is extended or contracted due to a temperature change in the storage tank, it is possible to prevent interference with the seating groove 113 .

The secondary sealing wall 120 may be laminated on the heat insulating wall 110, and the primary sealing wall 130 is laminated on the secondary sealing wall 120 at a predetermined interval to be in direct contact with the liquefied gas. can be arranged to do so.

Here, the primary sealing wall 130 may be formed by integrally connecting a plurality of metal plates to each other through welding, and the secondary sealing wall 120 is also formed on the inner surface of the primary sealing wall 130 in the same manner. It may be formed spaced apart, and it is possible to completely seal the liquefied gas stored in the storage tank from leaking out through this double sealing wall structure.

In this case, the primary and secondary sealing walls 120 and 130 may be made of stainless steel or the like.

In addition, the primary and secondary sealing walls 120 and 130 may be respectively formed with wrinkle portions 121 and 131 to be deformed by temperature change.

That is, a plurality of pleats 121 and 131 are formed on the primary and secondary sealing walls 120 and 130 to prevent damage during contraction and elongation. It can be stretched or contracted to prevent damage due to thermal deformation applied to the sealing wall.

Specifically, in the present embodiment, the second wrinkle portion 121 in the form of concave depression at predetermined intervals may be formed in the secondary sealing wall 120 , and provided in a spaced apart state above the secondary sealing wall 120 . The first corrugated portion 131 may be formed in a convex shape at a position corresponding to the second wrinkled portion 121 on the primary sealing wall 130 .

Accordingly, the first wrinkle part 131 and the second wrinkle part 121 disposed vertically on the top of the heat insulating wall 110 may be provided in a shape that protrudes in opposite directions to each other.

At this time, in the secondary sealing wall 120 laminated on the heat insulating wall 110 , the protruding lower part of the second wrinkle part 121 formed in a depressed shape is inserted into the seating groove 113 of the upper surface of the heat insulating wall 110 , can be placed.

Such primary and secondary sealing walls 120 and 130 may be fixed to the insulating wall 110 by an anchor member (not shown).

The spacer 140 may be interposed between the primary sealing wall 130 and the secondary sealing wall 120 to maintain a constant distance between the primary sealing wall 130 and the secondary sealing wall 120 . .

Here, the spacer 140 may be formed of plywood or the like.

That is, in order to form the insulating structure 100 in a state in which the primary sealing wall 130 and the secondary sealing wall 120 are laminated adjacently to prevent contact with each other, the primary sealing wall 130 and the secondary sealing wall 130 are stacked adjacently. A spacer 140 may be interposed between the sealing walls 120 .

5 is a cross-sectional view showing the shape and installation structure of the primary and secondary sealing walls 120 and 130 according to an embodiment of the present invention.

Referring to FIG. 5 , the primary sealing wall 130 and the secondary sealing wall 120 may be formed in the same shape, and the secondary sealing wall 120 is formed so that the second wrinkle part 121 protrudes downward. It may be disposed and installed on the heat insulating wall 110, and the primary sealing wall 130 has a shape in which the secondary sealing wall 120 is inverted, and the first wrinkle part 131 is disposed so as to protrude upward to the spacer 140. It can be installed above.

As described above, the primary sealing wall 130 and the secondary sealing wall 120 of this embodiment are the same sealing wall except in the installation form, and in the sealing wall production process, the primary sealing wall and the secondary sealing wall are separated as in the prior art. There is an advantage that productivity can be increased and the manufacturing cost of the sealing wall can be reduced because it can be produced through the same production process without the need for production.

In addition, a seating groove 113 into which the second wrinkle part 121 of the secondary sealing wall 120 can be correspondingly inserted is formed on the upper surface of the heat insulating wall 110 at a predetermined position, so that the heat insulating wall 110 is formed. In the process of stacking and installing the secondary sealing wall 120 in the second corrugation ( When the 121) is inserted, the secondary sealing wall 120 is aligned on the insulating wall 110 in the correct position, so that the sealing wall installation operation can be easily and conveniently performed.

In addition, unlike the conventional insulating structure, the second wrinkle portion 121 of the secondary sealing wall 120 does not protrude upward, but protrudes downward and is installed on the insulating wall 110 , so that the secondary sealing wall 120 is installed on the insulating wall 110 . ), there is no need to process a hole through which the wrinkle portion 121 of the secondary sealing wall 120 passes in the spacer 140 stacked on the upper portion of the second sealing wall 120 , and the flat spacer 140 is placed on the upper portion of the secondary sealing wall 120 . It can be laminated on the first sealing wall 130 thereon.

In the insulating structure 100 of this embodiment of the present embodiment having such a structure, when the sealing wall is installed, the primary sealing wall 130 and the secondary sealing wall 120 are vertically spaced apart by a spacer 140 by a predetermined interval, and are separated and disposed. , The first wrinkled portion 131 and the second wrinkled portion 121 respectively formed on the primary sealing wall 130 and the secondary sealing wall 120 are disposed to protrude in opposite directions to each other, so that the wrinkled portions 121 and 131 are disposed to protrude in opposite directions. Since there is no interference between the sealing walls 120 and 130, it is not necessary to accurately align the sealing walls, and thus, work convenience for the sealing wall installation work can be improved.

Specifically, referring to FIGS. 3 to 5 , in constructing the heat insulating structure 100 of the liquefied gas storage tank according to the present embodiment, the heat insulating wall 110 is installed on the inner wall of the hull and then the heat insulating wall 110 . The secondary sealing wall 120 can be installed on the upper surface of By being inserted and seated correspondingly, the secondary sealing wall 120 can be easily aligned in place on the insulating wall 110 .

Here, when the second wrinkle part 121 is installed in close contact with the seating groove 113, the seating groove 113 or the second wrinkle part 121 when the second wrinkle part 121 is elongated due to a temperature change in the storage tank. ), since cracks may occur, the seating groove 113 may be formed as a groove larger than the second wrinkle part 121, and through this, when the second wrinkle part 121 is contracted or stretched due to a temperature change It is also possible to effectively prevent interference with the seating groove 113 .

In addition, the spacer 140 may be installed on the upper surface of the secondary sealing wall 120, and the first sealing wall may be installed on the upper surface of the spacer 140 so that the first wrinkle part 131 is disposed to protrude upward, As described above, the structure in which the secondary sealing wall 120 , the spacer 140 , and the primary sealing wall 130 are sequentially stacked may be fixed to the heat insulating wall 110 by an anchor member (not shown).

At this time, the first wrinkle portion 131 of the primary sealing wall 130 may be disposed at a position corresponding to the second corrugation portion 121 of the secondary sealing wall 120 up and down, and the spacer 140 is There is no interference between the first pleats 131 and the second pleats 121 by being disposed so that the first pleats 131 and the second pleats 121 protrude in opposite directions with each other therebetween, thereby sealing It is possible to improve work convenience for wall installation work and increase work efficiency.

That is, in the case of the conventional heat insulating structure, the second corrugation of the secondary sealing wall is disposed in the space inside the first corrugation of the primary sealing wall, so that the gap between the primary sealing wall and the secondary sealing wall is caused by the installation tolerance of the sealing wall, etc. When the alignment is misaligned, there is a problem that interference such as contact between the first wrinkle part and the second wrinkle part may occur, but the insulation structure 100 of the present invention has the first wrinkle part 131 and the second wrinkle part 121 There is no interference between the two, so the sealing wall installation work can be easily performed regardless of the installation tolerance.

On the other hand, the liquefied gas storage tank according to an embodiment of the present invention may be configured to include the heat insulating structure 100 having the structure as described above, and may store liquefied gas such as LNG in a cryogenic state in the internal space.

At this time, various external structures may be employed to minimize the natural vaporization of the liquefied gas and the change into BOG. As an example, a membrane type insulated to minimize BOG generation due to external heat intrusion It may be formed as or may be formed as an independent tank type.

As described above, the heat insulation structure 100 of the liquefied gas storage tank according to the embodiment of the present invention is a heat insulation wall 110, a secondary sealing wall 120, and a spacer 140 that are sequentially stacked on the inner wall of the hull. And by improving the installation structure of the primary sealing wall 130, it is possible to increase the convenience of the sealing wall installation work and at the same time increase the sealing reliability of the sealing wall.

In addition, since the wrinkled portions 121 and 131 formed on the primary and secondary sealing walls 120 and 130, respectively, are disposed to protrude in opposite directions, interference between the corrugated portions 121 and 131 of the primary and secondary sealing walls 120 and 130 is reduced. Therefore, the sealing wall installation operation can be easily performed regardless of the installation tolerance.

The embodiments of the present invention disclosed in the present specification and drawings are merely provided for specific examples in order to easily explain the technical contents of the present invention and help the understanding of the present invention, and are not intended to limit the scope of the present invention.

Therefore, the scope of the present invention should be construed as including all changes or modifications derived based on the technical spirit of the present invention in addition to the embodiments disclosed herein are included in the scope of the present invention.

100: insulation structure 110: insulation wall
111: insulation material 112: protection plate
113: seating groove 120: secondary sealing wall
121: second wrinkle 130: primary sealing wall
131: first wrinkle 140: spacer

Claims (5)

an insulating wall installed on the inner wall of the hull to block heat transfer from the outside, and having seating grooves formed on the upper surface at predetermined intervals;
a secondary sealing wall provided on the heat insulating wall and having a second wrinkle portion protruding downward to be inserted corresponding to the seating groove;
a primary sealing wall provided in a spaced apart state from the secondary sealing wall, a first corrugated portion protruding upward at a position corresponding to the second corrugated portion, and in direct contact with the liquefied gas; and
and a spacer interposed between the primary sealing wall and the secondary sealing wall to maintain a constant distance between the primary sealing wall and the secondary sealing wall.
The method of claim 1,
The seating groove of the insulating wall is,
Insulation structure formed to be larger than the second pleats so that the outer surface of the second pleats is spaced apart from the inner surface of the seating groove by a predetermined distance.
The method of claim 1,
The first sealing wall and the second sealing wall are formed in the same shape, and the first corrugated portion and the second corrugated portion is provided to protrude in opposite directions to each other.
The method of claim 1,
The insulating wall is
a heat insulating material made of a heat insulating material; and
Insulation structure comprising a protective plate coupled to each of the upper and lower surfaces of the insulator to protect the insulator.
A liquefied gas storage tank comprising the thermal insulation structure of any one of claims 1 to 4.

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