KR101889405B1 - LNG storage tank having second barrier comprising of a plurality of block panels and method for manufacturing the same - Google Patents

Abstract

The present invention relates to a gas turbine comprising: a primary barrier forming a space for storing liquefied natural gas therein; At least two posts coupled to the outer surface of the primary barrier and coupled to protrude outwardly perpendicularly to the outer surface of the primary barrier; A spacer provided on an outer circumferential surface of the post to support the post, a lower surface coupled to the outer surface of the primary barrier, and having a predetermined thickness; A secondary barrier having an opening through which the post passes, the secondary barrier being seated and coupled to an upper surface of the spacer; A heat insulating material attached to an upper surface of the secondary barrier; And a post sealing part coupled to an outer circumferential surface of the post and hermetically sealed between the heat insulating material and the post.

Description

BACKGROUND OF THE INVENTION 1. Field of the Invention [0001] The present invention relates to an LNG storage tank having a secondary barrier composed of a plurality of block panels and a method of manufacturing the LNG storage tank,

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an LNG storage tank and a method of manufacturing the LNG storage tank, and more particularly, to an LNG storage tank having a secondary wall to prevent an accident caused by leakage of the LNG and a method of manufacturing the same.

Today, in order to store and transport a large amount of materials such as hydrogen, oxygen and natural gas, mainly a low-temperature liquefaction method is used. To this end, in the design of the heat-insulating container for storing and transporting low temperature liquefied gas, Insulation technology that prevents the boiling of the liquefied gas is most important. Currently, there is an external insulation method and an internal insulation method, which are currently being designed and commercialized. The internal insulation method can control the temperature of the container enclosure similarly to the ambient temperature. Therefore, There is no advantage.

This type of internal insulation method is known as a membrane type insulation system manufactured by France Gittite (GTT) having a double wall structure based on the middle barrier structure of McDonnell Douglas Co., USA.

In Korea, Korean Patent Registration No. 10-0807961 and Korean Laid-Open Patent Application No. 2015-0100010 disclose an LNG storage tank having a secondary barrier and a manufacturing method thereof.

However, the conventional production of the LNG storage tank having the secondary barrier has a disadvantage in that the production process is complicated and the production cost is high.

SUMMARY OF THE INVENTION It is an object of the present invention to provide an LNG storage tank and a method of manufacturing the LNG storage tank, which have been developed to solve the above-described problems, and which have a secondary barrier that reduces the manufacturing cost and simplifies the manufacturing process.

In order to achieve the above-mentioned object, the present invention provides a gas turbine comprising: a primary barrier forming a space for storing liquefied natural gas therein; At least two posts coupled to the outer surface of the primary barrier and coupled to protrude outwardly perpendicularly to the outer surface of the primary barrier; A spacer provided on an outer circumferential surface of the post to support the post, a lower surface coupled to the outer surface of the primary barrier, and having a predetermined thickness; A secondary barrier having an opening through which the post passes, the secondary barrier being seated and coupled to an upper surface of the spacer; A heat insulating material attached to an upper surface of the secondary barrier; And a post sealing part coupled to an outer circumferential surface of the post and hermetically sealed between the heat insulating material and the post.

The present invention also provides a gas turbine comprising: a primary barrier forming a space for storing liquefied natural gas therein; A post coupled to the outer surface of the primary barrier and coupled to the outer surface of the primary barrier in a direction perpendicular to the primary barrier; A spacer having a predetermined thickness and coupled to the outer surface of the primary barrier; A secondary barrier which is seated on the upper surface of the spacer and is composed of a plurality of block panels; A heat insulating material attached to an upper surface of the secondary barrier; And a post sealing part coupled to an outer circumferential surface of the post and hermetically sealed between the heat insulating material and the post.

At this time, the shape of the block panel is polygonal, and the edges of the plurality of block panels can be seated on the upper surface of the spacer.

The block panel may be rectangular.

In addition, the block panel may have truncated corners with some cut edges.

The edges of two adjacent block panels of the plurality of block panels may be partially overlapped.

The plurality of block panels coupled to the upper surface of the spacer may be coupled to the upper surface of the spacer in order in the clockwise or counterclockwise direction with respect to the center of the spacer.

The cover may further include a cover sealing the upper surface of the post sealing portion.

At this time, the post may be a stud bolt, and the separating unit may be a washer.

The post sealing portion may be a hollow bolt coupled to the stud bolt.

It is preferable that the upper surface of the hollow bolt is located higher than the upper surface of the stud bolt and is located at the same height as the upper surface of the heat insulating material.

Preferably, the cover is a cover bolt, and the upper surface of the hollow bolt is coupled to the hollow bolt, and the lower surface of the cover bolt is coupled to the upper surface of the hollow bolt.

According to another aspect of the present invention, there is provided a method of manufacturing a liquefied natural gas, the method comprising: joining a post having a predetermined length to an outer surface of a primary barrier having a space for storing liquefied natural gas therein; Inserting a spaced apart unit having a predetermined thickness into the post and coupling it to the outer surface of the primary barrier; Coupling a secondary barrier having an opening through which the post is formed to an upper surface of the spacing unit; Attaching a heat insulating material on the secondary barrier; And providing a post sealing part that surrounds the outer circumferential surface of the post and hermetically seals between the heat insulating material and the post. The present invention also provides a method of manufacturing an LNG storage tank having a secondary barrier.

According to another aspect of the present invention, there is provided a method of manufacturing an LNG storage tank having a secondary barrier comprising a plurality of block panels each having a polygonal shape, the method comprising the steps of: Joining the posts with the posts; Inserting a spaced apart unit having a predetermined thickness into the post and coupling it to the outer surface of the primary barrier; Coupling a spacer having a predetermined thickness to the outer surface of the primary barrier; Coupling a block panel having an opening through which the post passes, to an upper surface of the spacer unit; Coupling edges of the plurality of block panels to an upper surface of the spacer; Attaching a heat insulating material on the plurality of block panels; And providing a post sealing part that surrounds the outer circumferential surface of the post and hermetically seals between the heat insulating material and the post. The present invention also provides a method of manufacturing an LNG storage tank having a secondary barrier.

At this time, it may further include a step of overlapping the edges of two adjacent block panels among the plurality of block panels.

According to another aspect of the present invention, there is provided a method of manufacturing an LNG storage tank having a secondary barrier comprising a plurality of block panels each having a polygonal shape, the method comprising the steps of: Engaging a stud bolt with the stud bolt; Inserting a washer having a predetermined thickness into the stator bolt and coupling the washer to the outer wall of the primary wall; Coupling a spacer having a predetermined thickness to the outer surface of the primary barrier; Coupling a block panel having an opening through which the post penetrates to an upper surface of the washer; Coupling edges of the plurality of block panels to an upper surface of the spacer; Attaching a heat insulating material on the block panel; Coupling a hollow sealing bolt to the stud bolt; And joining a cover bolt to an upper surface of the sealing bolt. The present invention also provides a method of manufacturing an LNG storage tank having a secondary barrier.

At this time, at least one of the stud bolt, the washer, and the secondary barrier may be joined by welding.

The present invention can prevent an accident caused by LNG leakage by collecting the leaked LNG in the buffer space even if the LNG leaks due to the damage of the primary barrier.

Further, there is an advantage that a manufacturing process and manufacturing cost of the LNG storage tank can be reduced by using a member such as a bolt and / or a washer which is simple in manufacturing and low in manufacturing cost.

In addition, the secondary barrier may be formed of a plurality of block panels to increase the assembling efficiency and simplify the manufacturing process.

1 to 6 are cross-sectional views illustrating steps of a manufacturing process of an LNG storage tank according to an embodiment of the present invention.
7 is a plan view schematically illustrating an LNG storage tank according to another embodiment of the present invention.
8 is a cross-sectional view of a spacer with two block panels joined together;
9 is a plan view showing a step of a manufacturing process of an LNG storage tank according to another embodiment of the present invention.
10 is a flowchart illustrating a method of manufacturing an LNG storage tank according to an embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described in detail with reference to the accompanying drawings, which will be readily apparent to those skilled in the art. The present invention may, however, be embodied in many different forms and should not be construed as limited to the embodiments set forth herein. In order to clearly illustrate the present invention, parts not related to the description are omitted, and similar parts are denoted by like reference characters throughout the specification.

The terms used in this specification will be briefly described and the present invention will be described in detail.

While the present invention has been described in connection with what is presently considered to be the most practical and preferred embodiment, it is to be understood that the invention is not limited to the disclosed embodiments. Also, in certain cases, there may be a term selected arbitrarily by the applicant, in which case the meaning thereof will be described in detail in the description of the corresponding invention. Therefore, the term used in the present invention should be defined based on the meaning of the term, not on the name of a simple term, but on the entire contents of the present invention.

When an element is referred to as "including" an element throughout the specification, it is to be understood that the element may include other elements as well, without departing from the spirit or scope of the present invention.

DETAILED DESCRIPTION OF THE PREFERRED EMBODIMENTS Hereinafter, the present invention will be described in detail with reference to the accompanying drawings.

Hereinafter, an LNG storage tank having a secondary barrier according to an embodiment of the present invention and a method of manufacturing the LNG storage tank will be described with reference to FIGS. 1 to 10. FIG.

Referring to FIG. 10, a method of manufacturing an LNG storage tank having a secondary barrier 40 according to an embodiment of the present invention includes a primary barrier 10 having a space for storing liquefied natural gas therein And joining the posts 20 having a predetermined length to the outer surface (S100).

The method may further include a step S110 of inserting the spacing unit 30 having a predetermined thickness and formed with holes into the post 20 and bonding the spacing unit 30 to the outer surface of the primary barrier 10. The method may further include a step (S120) of coupling a secondary barrier 40 having an opening through which the post 20 is formed to an upper surface of the separation unit 30. In addition, it may include the step of attaching the heat insulating material 50 to the secondary barrier 40 (S130). In addition, a step (S140) of enclosing the outer circumferential surface of the post 20 and providing a post-sealing part 60 which is airtight between the heat insulating material 50 and the post 20 may be included.

Referring to FIG. 1, the step of joining the posts 20 is a step of joining the posts 20 having a predetermined length to the outer surface of the primary barrier 10. The posts 20 are preferably vertically coupled to the outer surface of the primary barrier 10. At least two of the posts 20 are provided on the outer surface of the primary barrier 10, and preferably two or more of the posts 20 are installed. The number of the posts 20 may vary depending on the width of the primary barrier 10. The posts 20 may be joined to the outer surface of the primary barrier 10 through a weld 21.

According to one embodiment of the present invention, the post 20 may be a stud bolt 20 (stud bolt). The stud bolts 20 are coupled to the outer circumferential surface of the primary barrier 10 by welding 21 but may be formed by forming grooves with a predetermined depth in the primary barrier 10, . ≪ / RTI >

Referring to FIG. 2, the step S110 of coupling the separation unit 30 is a step of coupling the separation unit 30 having a predetermined thickness to the outer surface of the primary barrier 10. LNG leakage between the primary barrier 10 and the secondary barrier 40 by a height corresponding to the thickness of the separation unit 30 is reduced when the secondary barrier 40 is subsequently coupled to the upper surface of the separation unit 30. [ The buffer space 45 can be formed.

The spacing unit 30 may be coupled to the outer surface of the primary barrier 10 through the outer surface of the post 20. At this time, the spacing unit 30 is provided in close contact with the outer circumferential surface (more specifically, the root portion of the post 20) of the post 20, and can contribute to the support of the post 20.

The spacing unit 30 may be joined to the outer surface of the primary barrier 10 by welding 31 to the post 20.

According to an embodiment of the present invention, the spacing unit 30 may include a washer 30. When the post 20 is a stud bolt 20, the washer 30 can be fastened to the stud bolt 20 to secure the fastening, and further the washer 30 can be welded to the primary wall 10, So that the coupling can be further strengthened.

Referring to FIG. 3, the step of joining the secondary barrier 40 (S120) is a step of joining the secondary barrier 40 to the upper surface of the separation unit 30. The secondary barrier 40 is coupled to the upper surface of the separation unit 30 and spaced apart from the primary barrier 10 by a height corresponding to the thickness of the separation unit 30. A buffer space 45 is formed between the primary barrier 10 and the secondary barrier 40 and is collected in the buffer space 45 even if the LNG leaks due to damage to the primary barrier 10, Accident caused by leakage can be prevented.

A plurality of posts 20 and spacing units 30 are provided at each point on the outer surface of the primary barrier 10 and the secondary barrier 40 extends between the posts 20 and the spacing unit 30. [ Respectively. That is, all the planes positioned between the plurality of posts 20 can be shielded by the secondary barrier 40.

The secondary barrier 40 may have an opening through which the post 20 is inserted and the size of the opening may be between the size of the outer circumference of the spacer 20 and the size of the outer circumference of the post 20. That is, it is preferable that the secondary barrier 40 is formed on the upper surface of the spacing unit so that it is smaller than the outer circumferential size of the spacing unit and is formed larger than the outer circumferential surface of the post 20 for joining the post sealing unit 60 . 3, the inner surface of the opening of the secondary barrier 40 is spaced apart from the outer peripheral surface of the post 20 by a predetermined distance.

The secondary barrier 40 may be coupled to the upper surface of the spacer unit 30 by welding. In addition, the secondary barrier 40 is preferably made of stainless steel.

Referring to FIG. 4, the step of attaching the heat insulating material 50 (S130) attaches the heat insulating material 50 on the secondary wall 40 to maintain the state of the stored LNG.

The heat insulating material (50) is attached to the upper surface of the secondary barrier (40). At this time, an opening is also formed in the heat insulating material 50, and the size of the opening is preferably the same as the size of the opening formed in the secondary barrier 40. The heat insulating material (50) is installed so that the post (20) is positioned at the center of the opening of the heat insulating material (50).

In addition, it is preferable that the height (thickness) of the heat insulating material 50 is longer than the length of the posts 20. More specifically, it is preferable to configure the thickness of the heat insulating material 50 so that the upper surface of the heat insulating material 50 is located higher than the upper surface of the post 20. [

Referring to FIG. 5, the step of installing the post sealing part 60 is a step S140 of sealing a space between the heat insulating material 50 and the post 20.

The post sealing part 60 is provided between the heat insulating material 50 and the post 20 to airtight and insulate the two members. The post sealing part 60 is installed so as to surround the outer circumferential surface of the post 20 and the outer side surface of the post sealing part 60 is provided in close contact with the inner surface of the opening part of the heat insulating material 50.

The height of the post sealing part 60 is preferably equal to the height of the heat insulating material 50. That is, it is preferable that the upper surface of the post-sealing portion 60 and the upper surface of the heat insulating material 50 are located at the same height.

According to one embodiment of the present invention, the post sealing part 60 may be a hollow bolt 60. When the post 20 is the stud bolt 20, the hollow bolt 60 is inserted into the stud bolt 20 through the thread formed on the outer surface of the stud bolt 20 and the thread formed on the inner surface of the hollow bolt 60 .

According to an embodiment of the present invention, it is possible to further include a step of engaging the cover sealing part 60 to seal the post sealing part 60.

Referring to FIG. 6, the cover 70 may be coupled to the upper surface of the post sealing portion 60 to prevent heat loss through the upper portion of the post 20. Referring to FIG. According to one embodiment of the present invention, the cover 70 may be composed of a cover bolt 70. The cover bolt 70 is inserted into the hollow bolt 60 and fastened to seal the upper surface of the post sealing part 60 and the upper part of the post 20. [

At this time, the lower surface of the head of the cover bolt (70) is provided in close contact with the upper surface of the post sealing portion (60). In addition, the head of the cover bolt 70 may be installed so as to protrude to the outside. That is, the head of the cover bolt 70 can be installed so as to be positioned higher than the upper surface of the heat insulating material 50 and the upper surface of the post sealing portion 60.

In the following, an embodiment in which the secondary barrier is composed of a plurality of block panels will be described.

Although the secondary barrier may be composed of one integrated panel, it may not be easy to constitute an integral panel when the surface area of the LNG tank is wide.

In this case, as in the embodiment described below, the secondary barrier may be modularized to form a plurality of block panels, thereby increasing assembly efficiency and facilitating the fabrication process.

First, the embodiment described below has the same configuration as that of the embodiment described with reference to FIG. 1 to FIG. 6, except that the secondary barrier is composed of a plurality of block panels. .

That is, the steps of joining the posts, joining the spacing units, joining the heat insulating material on the secondary barrier, attaching the heat insulating material, and installing the post sealing part are equally applicable.

Referring to FIG. 7, the secondary barrier 40 may be composed of a plurality of block panels 41, 42, 43 and 44. The plurality of block panels 41, 42, 43 and 44 are preferably polygonal.

Although FIG. 7 shows a rectangular block panel, it is needless to say that the block panel may be formed of a triangular or hexagonal block panel.

In this case, the number of corners of the block panel to be coupled to the upper surface of the spacer 35, which will be described below, may vary depending on the internal angle of the polygon.

That is, if a block panel of a regular triangle having a cabinet angle of 60 degrees is used, six block panels can be coupled to the upper surface of the spacer 35. [

7 and 9, spacers 35 are provided at points P where the corners of the four block panels 41, 42, 43 and 44 are concentrated. The spacer 35 is attached to the outer surface of the primary barrier 10.

The spacer 35 has a predetermined thickness, and the edge of the block panel is seated and coupled to the upper surface of the spacer 35. That is, the corner portions of the block panels 41, 42, 43 and 44 are supported by the spacers 35.

Preferably, the spacer 35 is coupled to the outer surface of the primary barrier 10 before the step S120 of joining the secondary barrier 40.

The spacers 35 are provided at points that are distinct from the joining points of the posts and spacing units 30. Thus, the spacer 35 may be engaged before or after engaging the post (S100) or before and after engaging the spacing unit 30 (S110).

The spacer 35 may be welded to the outer surface of the primary barrier 10.

In addition, it is preferable that the spacer 35 is formed to have the same thickness (height) as the spacing unit 30.

The spacer 35 also supports the secondary barrier 40 and forms a buffer space between the secondary barrier 40 and the primary barrier 10 so that even if the LNG leaks due to damage to the primary barrier 10 And collected in the buffer space 45.

Referring to FIG. 9, the shape of the spacer 35 may be rectangular, but is not limited thereto.

According to an embodiment of the present invention, the edges of the plurality of block panels 41, 42, 43, and 44 may be partially cut. That is, the plurality of block panels 41, 42, 43 and 44 preferably have truncated corners.

It is possible to prevent the overlapping portion of the block panel from being excessively projected from the upper surface of the spacer 35 by cutting a part of the corner of the block panel.

That is, it is possible to prevent three or more block panels from overlapping at any point on the spacer 35 by partially cutting the corner of the block panel.

Particularly, since the block panel constituting the secondary barrier 40 has a very thin thickness, the flexibility is high and it can be coupled as shown in FIG. 8 because it is bent.

9 (a) and 9 (b), the first block panel 41 is coupled to the upper surface of the spacer 35. The first block panel 41 may be welded to the upper surface of the spacer 35.

At this time, only a part of the corners of the first block panel 41 are coupled to the upper surface of the spacer 35.

Referring to FIG. 9 (c), the second block panel 42 is bonded to the upper surface of the spacer 35. At this time, it is preferable that the rim of the first block panel 41 and the rim of the second block panel 42 are partially overlapped (S) for the airtightness between the adjacent block panels 41 and 42.

The third and fourth block panels 43 and 44 are bonded to the upper surface of the spacer 35 in the same manner. (See Figs. 9 (d) and 9 (e)).

On the other hand, in order to minimize the height difference due to the engagement of the plurality of block panels 41, 42, 43 and 44, the spacers 35, It is preferable to join the block panel to the upper surface of the block panel.

9, the second through fourth block panels 41, 42, and 43 are shown to be engaged in the counterclockwise direction starting from the first block panel 41. However, It is needless to say that the panels 41, 42 and 43 can be combined.

It will be understood by those skilled in the art that the foregoing description of the present invention is for illustrative purposes only and that those of ordinary skill in the art can readily understand that various changes and modifications may be made without departing from the spirit or essential characteristics of the present invention. will be. It is therefore to be understood that the above-described embodiments are illustrative in all aspects and not restrictive. For example, each component described as a single entity may be distributed and implemented, and components described as being distributed may also be implemented in a combined form.

The scope of the present invention is defined by the appended claims rather than the detailed description and all changes or modifications derived from the meaning and scope of the claims and their equivalents are to be construed as being included within the scope of the present invention do.

10 Primary barrier
20 posts
30 separation unit
35 Spacer
40 Secondary barrier
41, 42, 43, 44 block panels
50 Insulation
60 post sealing part
70 cover

Claims (14)

A primary barrier forming a space for storing liquefied natural gas therein;
A plurality of posts coupled to the outer surface of the primary barrier and protruding outwardly and perpendicularly to the outer surface of the primary barrier and spaced apart from one another;
A spacer having a predetermined thickness and coupled to the outer surface of the primary barrier;
A secondary barrier which is seated on the upper surface of the spacer and is composed of a plurality of block panels;
A heat insulating material attached to an upper surface of the secondary barrier; And
And a post sealing part coupled to an outer circumferential surface of the post and hermetically sealed between the heat insulating material and the post,
The shape of the block panel is polygonal,
The edges of the plurality of block panels are seated and engaged on the upper surface of the spacer,
The block panel has a truncated corner with some cut edges,
Wherein a plurality of adjacent block panels of the plurality of block panels are partially overlapped with each other,
Wherein the cut edges of the plurality of block panels are disposed on the spacer and the cut edges form an opening exposing a portion of the spacer such that two or less of the block panels overlap in the overlapping of the block panels ,
Further comprising a separating unit provided on an outer circumferential surface of the post to support the post, a lower surface coupled to the outer surface of the primary wall and having a predetermined thickness, disposed between the primary wall and the secondary wall, ,
Wherein the spacing unit and the spacers are spaced apart from each other,
Wherein the spacer is disposed between the primary barrier and the secondary barrier to contact the primary and secondary barriers,
Wherein the spacer engages the cutting edge of at least three of the block panels. ≪ RTI ID = 0.0 > 21. < / RTI >
delete The method according to claim 1,
Wherein the block panel is rectangular. ≪ Desc / Clms Page number 17 >
delete delete The method according to claim 1,
A plurality of block panels coupled to the upper surface of the spacer,
Wherein the spacer is coupled to the upper surface of the spacer in order in a clockwise or counterclockwise direction with respect to the center of the spacer.
The method according to claim 1,
Further comprising a cover sealing the upper surface of the post sealing part. ≪ RTI ID = 0.0 > 21. < / RTI >
8. The method of claim 7,
Wherein the post is a stud bolt, the spacer is a washer, and the post sealing part is a hollow bolt coupled to the stud bolt.
A method of manufacturing an LNG storage tank having a secondary barrier comprising a plurality of block panels having a polygonal image,
The method comprising: coupling a plurality of posts spaced apart from each other with a predetermined length on an outer surface of a primary barrier having a space for storing liquefied natural gas therein;
Inserting a spaced apart unit having a predetermined thickness into the post and coupling it to the outer surface of the primary barrier;
Coupling a spacer having a predetermined thickness to the outer surface of the primary barrier;
Coupling the plurality of block panels having openings through which the posts are formed to an upper surface of the spacing unit;
Coupling edges of the plurality of block panels to an upper surface of the spacer;
Attaching a heat insulating material on the plurality of block panels; And
And a post sealing part surrounding the outer circumferential surface of the post and hermetically sealing the space between the heat insulating material and the post,
Further comprising the step of superimposing the edges of two adjacent block panels among the plurality of block panels,
The shape of the block panel is polygonal,
The edges of the plurality of block panels are seated and engaged on the upper surface of the spacer,
The block panel has a truncated corner with some cut edges,
Wherein a plurality of adjacent block panels of the plurality of block panels are partially overlapped with each other,
Wherein the cut edges of the plurality of block panels are disposed on the spacer and the cut edges form an opening exposing a portion of the spacer such that two or less of the block panels overlap in the overlapping of the block panels ,
Wherein the spacing unit and the spacers are spaced apart from each other,
Wherein the spacer is disposed between the primary barrier and the secondary barrier to contact the primary and secondary barriers,
Wherein the spacer engages the cutting edge of at least three of the block panels. ≪ RTI ID = 0.0 > 21. < / RTI >
delete 10. The method of claim 9,
Wherein the upper surface of the spacer is coupled to the block panel in a clockwise or counterclockwise direction with respect to a center of the spacer.
10. The method of claim 9,
Further comprising the step of joining a cover sealing the upper surface of the post-sealing part.
delete delete

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