KR101739464B1 - Lng storage tank - Google Patents
Lng storage tank Download PDFInfo
- Publication number
- KR101739464B1 KR101739464B1 KR1020140083673A KR20140083673A KR101739464B1 KR 101739464 B1 KR101739464 B1 KR 101739464B1 KR 1020140083673 A KR1020140083673 A KR 1020140083673A KR 20140083673 A KR20140083673 A KR 20140083673A KR 101739464 B1 KR101739464 B1 KR 101739464B1
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- heat insulating
- wall
- insulating wall
- primary
- natural gas
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Abstract
The present invention relates to a plug that is easy to install, can reduce work time, and is strong in holding force. According to an embodiment of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: a primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas; A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas; A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas; An insulating wall fixing device for fixing the primary heat insulating wall to the secondary heat insulating wall; And a plug for blocking a hole required for installing the heat insulating wall fixing device, wherein the heat insulating wall fixing device and the plug are coupled by bolting.
Description
The present invention relates to a liquefied natural gas storage tank, and more particularly, to a plug that is easy to install, can reduce work time, and has a strong holding force.
Natural gas is a fossil fuel containing methane as a main component and a small amount of ethane, propane, and the like, and has recently been regarded as a low-pollution energy source in various technical fields.
Natural gas is transported in a gaseous state via land or sea gas pipelines, or in a state of liquefied natural gas (LNG), stored in an LNG carrier and transported to a distant consumer. Liquefied natural gas is obtained by cooling natural gas at a cryogenic temperature (below about -163 ° C), and its volume is reduced to about 1/600 of that of natural gas, making it well suited for long-distance transport through the sea.
Liquefied natural gas carriers are equipped with cargo tanks (also called cargo tanks) that can store and store liquefied natural gas that has been liquefied by cooling natural gas. Since the boiling point of liquefied natural gas is about -162 ° C at atmospheric pressure, the storage tank for liquefied natural gas is a material that can withstand extremely low temperatures such as aluminum, stainless steel and 35% nickel steel to safely store and store liquefied natural gas. And is designed to have a structure resistant to thermal stress and heat shrinkage and to prevent heat penetration.
LNG RV (Regasification Vessel), which transports LNG carriers and LNG for unloading LNG to land customers by landing LNG and landing on land, reclaiming stored LNG after arriving at land demand and unloading it into natural gas, Floating marine structures such as LNG FPSO (Floating, Production, Storage and Offloading) and LNG FSRU (FSRU) also include storage tanks installed in LNG carriers or LNG RVs.
LNG FPSO is a floating marine structure that is used to liquefy natural gas produced directly from the sea and store it in a storage tank and, if necessary, to transfer the LNG stored in this storage tank to an LNG carrier. In addition, the LNG FSRU is a floating type of floating structure that stores LNG unloaded from LNG carriers in offshore sea, stores it in a storage tank, vaporizes LNG if necessary, and supplies the LNG to the customer.
In this way, a storage tank for storing LNG in a cryogenic condition is installed in a marine structure such as an LNG carrier, LNG RV, LNG FPSO, and LNG FSRU that transports or stores a liquid cargo such as LNG.
Such a storage tank can be classified into an independent tank type and a membrane type depending on whether the load of the cargo directly acts on the heat insulating material. Membrane-type storage tanks are divided into GTT NO 96 type and TGZ Mark III type. Independent tank type storage tanks are divided into MOSS type and IHI-SPB type.
1 is a schematic view showing the structure of a GTT NO 96 type storage tank which is a type of a liquefied natural gas storage tank of the prior art.
1, the GTT NO 96 type storage tank has a structure in which a
The primary
2 is a schematic view showing the structure of a TGZ Mark III type storage tank, which is one type of a liquefied natural gas storage tank of the prior art.
Referring to FIG. 2, the TGZ Mark III type storage tank has a structure in which a
The primary
The TGZ Mark III type storage tank is formed by laminating the
In addition, the GTT NO 96 type storage tank has a disadvantage of high manufacturing cost since the primary sealing wall and the secondary sealing wall are made of expensive invar steel.
It is an object of the present invention to provide a liquefied natural gas storage tank that is stable to heat shrinkage, can improve ease of installation and preparation, and can reduce manufacturing costs.
It is another object of the present invention to provide a plug for blocking the holes required for installing an insulating wall fixing device for fixing a primary insulation wall to a secondary insulation wall in a storage tank for storing liquefied natural gas, And the holding force is strong, thereby providing a stable plug.
According to an aspect of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: a primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas; A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas; A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas; An insulating wall fixing device for fixing the primary heat insulating wall to the secondary heat insulating wall; And a plug for blocking a hole required for installing the heat insulating wall fixing device, wherein the heat insulating wall fixing device and the plug are coupled by bolting.
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Further, the heat insulating wall fixing device includes a stud bolt fixed to the secondary heat insulating wall; Wherein the stud bolt is inserted into the through hole and is fastened to the nut so that the primary heat insulating wall is inserted into the secondary heat insulating wall, Can be fixed to the wall.
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The plug may also include a top plate of plywood material; A bottom plate of plywood material; And a heat insulating material disposed between the upper plate and the lower plate.
In addition, the primary heat insulating wall can be fixed to the secondary heat insulating wall in a structure capable of sliding in the horizontal direction.
The storage tank may further include a secondary sealing wall positioned between the primary insulating wall and the secondary insulating wall to liquid-tighten the liquefied natural gas when the primary sealing wall leaks.
In addition, the primary sealing wall and the secondary sealing wall may be made of stainless steel.
Further, a wrinkle portion may be formed on the primary sealing wall and the secondary sealing wall.
According to another aspect of the present invention, there is provided a storage tank for storing liquefied natural gas, comprising: a plug for blocking a hole necessary for installing an insulating wall fixing device for fixing a primary insulating wall to a secondary insulating wall; Wherein the secondary insulation wall is installed on the inner wall of the storage tank to insulate the liquefied natural gas and the primary insulation wall is positioned above the secondary insulation wall to insulate the liquefied natural gas, Wherein the heat insulating wall fixing device and the plug are bolted to each other.
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Further, the heat insulating wall fixing device includes a stud bolt fixed to the secondary heat insulating wall; Wherein the stud bolt is inserted into the through hole and is fastened to the nut so that the primary heat insulating wall is inserted into the secondary heat insulating wall, Can be fixed to the wall.
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The plug may also include a top plate of plywood material; A bottom plate of plywood material; And a heat insulating material disposed between the upper plate and the lower plate.
In addition, the primary heat insulating wall can be fixed to the secondary heat insulating wall in a structure capable of sliding in the horizontal direction.
According to the embodiment of the present invention, the primary heat insulating wall can slide in the horizontal direction at the time of heat shrinking to minimize thermal stress, so that the liquefied gas storage tank is stable to heat shrinkage.
According to the embodiment of the present invention, by installing the plug in a bolting manner, there is an advantage that the plug installation work is easy, the working time is shortened, and the retention force is strong and stable.
According to the embodiment of the present invention, by providing the heat insulating wall fixing device at the edge of the primary heat insulating wall, the primary heat insulating wall can be stably fixed and the number of necessary heat insulating wall fixing devices can be minimized
1 is a schematic view showing the structure of a GTT NO 96 type storage tank which is a type of a liquefied natural gas storage tank of the prior art.
2 is a schematic view showing the structure of a TGZ Mark III type storage tank, which is one type of a liquefied natural gas storage tank of the prior art.
3 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.
4 is a cross-sectional view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
5 is a perspective view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
6 is a view showing a structure of an adiabatic wall fixing apparatus of a liquefied natural gas storage tank according to an embodiment of the present invention.
7 is a conceptual view showing a method of installing a plug of a heat insulating wall fixing device of a liquefied natural gas storage tank according to an embodiment of the present invention.
8 is a view showing the direction in which the primary heat insulating wall shrinks.
9 is a view showing deformation caused by heat shrinkage of the primary heat insulating wall.
10 is a view showing the position of the heat insulating wall fixing device of the liquefied natural gas storage tank according to the embodiment of the present invention.
Hereinafter, preferred embodiments of the present invention will be described in detail with reference to the accompanying drawings. In the drawings, the same reference numerals are used to designate the same or similar components throughout the drawings. In the following description of the present invention, a 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.
First, referring to FIG. 3, a structure of a ship having a liquefied natural gas storage tank according to an embodiment of the present invention will be described. 3 is a cross-sectional view of an exemplary vessel equipped with a liquefied natural gas storage tank according to an embodiment of the present invention.
3, the liquefied natural gas storage tank according to the present invention may be installed in the
Also, the inside of the
Here, the sealing
A
Next, with reference to FIGS. 4 and 5, a heat insulation structure of a liquefied natural gas storage tank according to an embodiment of the present invention will be described. FIG. 4 is a sectional view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention, and FIG. 5 is a perspective view of a heat insulating structure of a liquefied natural gas storage tank according to an embodiment of the present invention.
4 and 5, the liquefied natural gas storage tank according to the embodiment of the present invention includes a
The
The
The
The
The
The primary
A
A
The heat insulating
FIG. 6 is a view showing a structure of a heat insulating wall fixing device for a liquefied natural gas storage tank according to an embodiment of the present invention, and FIG. 7 is a perspective view of a plug of a heat insulating wall fixing device of a liquefied natural gas storage tank according to an embodiment of the present invention Fig.
6, the insulating
A
The primary
The
The
After the
According to the heat insulating
A
A hole is formed in the primary
The
The lower cap is composed of a cap part positioned under the lower plate and a flange part radially extending from the lower end of the cap part. The bottom plate has a hole formed at its center portion, so that the cap portion of the lower cap can be inserted into the hole. A thread is formed on the inside of the cap portion so that a threaded portion is fastened to the upper portion of the
According to the embodiment of the present invention, there is an advantage in that the operation is easier, the working time is reduced, and the holding force is stronger than in the case where the
Next, the position of the heat insulating wall fixing device of the liquefied natural gas storage tank according to the embodiment of the present invention will be described with reference to FIGS. 9 is a view showing a deformation of the primary heat insulating wall due to heat shrinkage, and Fig. 10 is a cross-sectional view of a liquefied natural gas storage tank according to an embodiment of the present invention. Fig. And the position of the heat insulating wall fixing device of FIG.
The shape of deformation of the primary
Therefore, as shown in FIG. 10, the heat insulating
As in the embodiment of the present invention, when the heat insulating
The foregoing description is merely illustrative of the technical idea of the present invention, and various changes and modifications may be made by those skilled in the art without departing from the essential characteristics of the present invention. Therefore, the embodiments disclosed in the present invention are intended to illustrate rather than limit the scope of the present invention, and the scope of the technical idea of the present invention is not limited by these embodiments. The scope of protection of the present invention should be construed according to the following claims, and all technical ideas within the scope of equivalents should be construed as falling within the scope of the present invention.
410: primary sealing wall
420: Primary insulation wall
430: Secondary sealing wall
440: Secondary insulation wall
450: Insulation wall fixing device
460: strip
620: Stud bolt
630: Special Washer
640: Spring washer
650: Nut
660: Spacer
670: Plug
Claims (15)
A primary sealing wall contacting the liquefied natural gas stored in the storage tank and liquid-tightly liquefying the liquefied natural gas;
A primary insulation wall positioned below the primary sealing wall to insulate the liquefied natural gas;
A secondary insulation wall installed on an inner wall of the storage tank to insulate the liquefied natural gas;
A secondary sealing wall positioned between the primary insulating wall and the secondary insulating wall to liquid-tighten the liquefied natural gas when the primary sealing wall leaks;
And a stud bolt inserted into a through hole formed in the primary sealing wall and screwed to a strip of a metal material provided on an upper plate of the secondary insulating wall, A heat insulating wall fixing device for fixing the heat insulating wall to the secondary heat insulating wall; And
And a plug for blocking a hole formed in the primary heat insulating wall for installation work of the heat insulating wall fixing device,
The plug includes a lower plate of a plywood material, a lower plate of a plywood material, a heat insulating material positioned between the upper plate and the lower plate, and a lower cap provided at a lower portion of the lower plate and having an inner thread formed therein ,
And a thread of the lower cap is fastened to an upper portion of the stud bolt exposed on a hole formed in the primary heat insulating wall.
The heat insulating wall fixing device comprises:
The stud bolt being inserted into a through hole formed in the primary heat insulating wall and the secondary sealing wall and screwed to a strip of a metal material provided on an upper plate of the secondary heat insulating wall;
A nut fastened to the stud bolt; And
And a special washer interposed between the stud bolt and the nut and having a diameter larger than the diameter of the nut,
Wherein the heat insulating wall fixing device fixes the primary heat insulating wall to the secondary heat insulating wall in such a structure that the primary heat insulating wall can slide in the horizontal direction.
Wherein the primary sealing wall and the secondary sealing wall are made of stainless steel.
Wherein the primary sealing wall and the secondary sealing wall are provided with a wrinkle portion.
Priority Applications (1)
Application Number | Priority Date | Filing Date | Title |
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KR1020140083673A KR101739464B1 (en) | 2014-07-04 | 2014-07-04 | Lng storage tank |
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KR1020140083673A KR101739464B1 (en) | 2014-07-04 | 2014-07-04 | Lng storage tank |
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KR20160004758A KR20160004758A (en) | 2016-01-13 |
KR101739464B1 true KR101739464B1 (en) | 2017-05-24 |
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KR1020140083673A KR101739464B1 (en) | 2014-07-04 | 2014-07-04 | Lng storage tank |
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Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101399843B1 (en) * | 2012-09-27 | 2014-05-30 | 삼성중공업 주식회사 | Lng cargo insulation system |
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2014
- 2014-07-04 KR KR1020140083673A patent/KR101739464B1/en active IP Right Grant
Patent Citations (1)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
KR101399843B1 (en) * | 2012-09-27 | 2014-05-30 | 삼성중공업 주식회사 | Lng cargo insulation system |
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