KR102335580B1 - liquefied gas tank and ship having the same - Google Patents

Abstract

The present invention relates to a liquefied gas storage tank and a ship including the same. The liquefied gas storage tank comprises: a wall which includes a primary barrier made of metal for forming a storage space for accommodating liquefied gas, a primary insulating wall disposed on the outside of the primary barrier, a secondary barrier provided on the outside of the primary insulating wall, and a secondary insulating wall disposed on the outside of the secondary barrier, and forms an insulating space between the first barrier and the second barrier, and in the outside of the second barrier; and a dome provided on the wall forming an upper surface of the storage space to finish the insulating space. The dome includes: an outer wall having a predetermined height above the storage space; an upper wall supported by the outer wall and having an inner end connected to the primary barrier; a support extending downward from the upper wall on the inner side of the outer wall; and a connection barrier sealing a gap between the secondary barrier and the support. In the support, a lower end is spaced apart upward compared to the secondary insulating wall, and a block material having a metal strip on the inner surface is seated between the secondary insulating wall and the support. In the connection barrier, a lower end is fixed to the secondary barrier and an upper end is fixed to the support via the metal strip of the block material. Therefore, the present invention can ensure the sealing to the insulating space.

Description

Liquefied gas storage tank and ship including the same {liquefied gas tank and ship having the same}

The present invention relates to a liquefied gas storage tank and a ship including the same.

According to recent technology development, liquefied gas such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG) is widely used to replace gasoline or diesel.

LNG in ships that transport or store liquefied gas such as LNG at sea, LNG RV (Regasification Vessel), LNG FPSO (Floating, Production, Storage and Offloading), and LNG FSRU (Floating Storage and Regasification Unit) A liquefied gas storage tank (referred to as a "cargo hold") is installed to store the liquefied gas in a cryogenic liquid state.

In the liquefied gas storage tank, boil off gas (BOG) can be generated by heat intrusion from the outside, and the natural vaporization rate (BOR), which is the vaporization rate of the boil-off gas, is lowered through an adiabatic design. This is the core technology of the design of the liquefied gas storage tank.

Accordingly, such a liquefied gas storage tank may have at least two layers of insulation space, and an Interbarrier Space (IBS) and an Insulation Space (IS) are provided in the outward direction based on the space in which the LNG is stored.

In addition, the liquefied gas storage tank has a dome formed on the upper surface for loading/unloading of LNG. However, the dome can be applied with a structure to secure insulation performance by supplying nitrogen gas to the inside of the IBS while sealing the IBS and IS. In the efficient structure of the dome for sealing and insulation, continuous research and development has been is losing

The present invention was created to solve the problems of the prior art as described above, and an object of the present invention is to provide a liquefied gas storage tank capable of stably sealing a barrier and a ship including the same.

A liquefied gas storage tank according to an aspect of the present invention includes a primary barrier made of a metal material forming a storage space for accommodating liquefied gas, a primary insulating wall disposed outside the primary barrier, and the primary thermal insulation A secondary barrier provided on the outside of the wall and a secondary heat insulating wall disposed outside the secondary barrier, wherein the insulating space is formed between the primary barrier and the secondary barrier and outside the secondary barrier. a wall that does; and a dome provided on the wall forming the upper surface of the storage space to close the insulating space, wherein the dome includes: an outer wall having a predetermined height above the storage space; an upper wall supported by the outer wall and connected to an inner end of the primary barrier; a support extending downwardly from the upper wall on the inner side of the outer wall; and a connection barrier for sealing between the secondary barrier and the support, wherein the support has a lower end spaced apart upward from the secondary insulating wall, and a metal strip on an inner surface between the secondary insulating wall and the secondary insulating wall. A block material to be provided is seated, and the connection barrier is characterized in that the lower end is fixed to the secondary barrier and the upper end is fixed to the support via the metal strip of the block material.

Specifically, the block material is fixed to the inner surface of the outer wall, and the connection barrier includes a lower connection barrier having a lower end fixed to the secondary barrier and an upper end connected to the metal strip of the block material, and a lower end of the block material and an upper connecting barrier connected to the metal strip and having an upper end connected to the support.

Specifically, the upper end of the lower connection barrier and the lower end of the upper connection barrier may be fixed with a gap vertically in the metal strip of the block material.

Specifically, the support is located outside the secondary barrier and has a vertical portion parallel to the outer wall, a bent portion bent inward from the lower portion of the vertical portion, and a secondary U in which the connection barrier is fixed to the inner surface. - A frame may be provided at the inner end of the bent part.

Specifically, the secondary U-frame may have an upper surface overlapped with the bent portion so that the inner surface is parallel to the metal strip and fixed.

A ship according to an aspect of the present invention is characterized in that it includes the liquefied gas storage tank.

The liquefied gas storage tank and the ship including the same according to the present invention can ensure the sealing of the insulating space by securing a structure that implements efficient and stable fixing to the secondary barrier, etc.

In addition, the liquefied gas storage tank and the ship including the same according to the present invention, since the connection barrier is connected to one side of the secondary barrier, the insulating material, the support, etc. and fixed, it is possible to maintain the airtightness of the liquefied gas.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.
2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.
3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.
4 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.
5 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.
6 is a partial cross-sectional view of a liquefied gas storage tank according to a fifth embodiment of the present invention.

The objects, specific advantages and novel features of the present invention will become more apparent from the following detailed description and preferred embodiments taken in conjunction with the accompanying drawings. In the present specification, in adding reference numbers to the components of each drawing, it should be noted that only the same components are given the same number as possible even though they are indicated on different drawings. In addition, in describing the present invention, if it is determined that a detailed description of a related known technology may unnecessarily obscure the gist of the present invention, the detailed description thereof will be omitted.

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

For reference, the present invention includes a ship equipped with a liquefied gas storage tank to be described below. At this time, the ship may be a ship that uses at least liquefied gas as a propulsion fuel/power generation fuel, and it is a concept that includes all gas carriers, merchant ships that transport cargo or people other than gas, FSRUs, FPSOs, bunkering vessels, and offshore plants. .

Hereinafter, each embodiment will be described with reference to each drawing, but with reference to FIG. 1 first, things that the embodiments have in common will be first described.

1 is a partial perspective view of a liquefied gas storage tank according to the present invention.

The liquefied gas storage tank 1 of the present invention is mounted on a hull (not shown). In this case, the liquefied gas storage tank 1 may be of a membrane type in which the bulkhead structure of the hull forms the outer wall 21 of the tank, or may be an independent type in which the liquefied gas storage tank 1 is introduced into the hull internal space.

The type of the liquefied gas storage tank (1) is not particularly limited, and the position at which the liquefied gas storage tank (1) is mounted on the hull (inboard or outboard such as the upper deck) is also not limited. However, the liquefied gas storage tank 1 of the present invention may have a structure in which a heat insulating layer is disposed in an inner direction.

For reference, in this specification, the liquefied gas storage tank 1 will be described assuming that it is a membrane type in which a heat insulating layer is directly constructed on the bulkhead of the hull. However, it should be noted that the liquefied gas storage tank 1 may be provided as an independent type, and the expression hull in the following may be interpreted by replacing the outer body of the liquefied gas storage tank 1 .

The liquefied gas storage tank 1 has a storage space. Liquefied gas may be stored in the storage space, and the liquefied gas may be LNG. Hereinafter, it is assumed that the liquefied gas is LNG, but in the present invention, the liquefied gas is forced to liquefy for storage because its boiling point is lower than room temperature, in addition to LNG, and encompasses all substances (LPG, ethane, hydrogen, ammonia, etc.) can do.

The storage space of the liquefied gas storage tank (1) may form a closed space surrounded by the wall (10). However, an opening (not shown) is provided on the upper surface of the wall 10 for the inflow and outflow of the liquefied gas, and a dome 20 is installed in the opening. That is, the liquefied gas storage tank 1 may include a wall 10 and a dome 20 .

The wall 10 forms a storage space for accommodating the liquefied gas and also forms an insulating space. Specifically, the wall 10 has a primary barrier 11 , a primary heat insulating wall 12 , a secondary barrier 13 , and a secondary insulating wall 14 from the inside to the outside. For reference, in this specification, the inside means the direction toward the inside of the space in which the liquefied gas is stored, and the outside means the opposite direction.

The primary barrier 11 forms a storage space for accommodating the liquefied gas. The primary barrier 11 may be made of a metal material to suppress brittle fracture caused by low-temperature liquefied gas, and is made of, for example, SUS, INVAR, or the like.

In addition, in order to prepare for sloshing in the primary barrier 11, a corrugated or uneven structure may be formed. As these primary barriers 11 are overlapped with each other and sealed by welding or the like, the entire storage space (except the dome 20 part) is made into a closed space.

The primary barrier 11 has a function as a barrier to prevent leakage of liquefied gas. In addition, since the secondary barrier 13 to be described later also serves as a barrier for preventing leakage of the liquefied gas, the liquefied gas storage tank 1 of the present invention has a structure that at least doubles the leakage prevention.

The primary thermal insulation wall 12 is disposed on the outside of the primary barrier 11 and implements the primary thermal insulation function. The primary insulating wall 12 may have a form in which a plywood 121 and an insulating block 122 are stacked. The plywood 121 is provided on the inside in the primary heat insulating wall 12, and an anchoring unit (not shown) is fixed to the plywood 121 . The anchoring unit is a configuration provided for overlap welding of the primary barrier 11 and may be made of the same/similar metal material as the primary barrier 11 .

The insulating block 122 is provided on the outside of the primary insulating wall 12 and has thermal insulation properties. The insulating block 122 may be made of a polyurethane foam block, or a box block in which the insulating material is accommodated. The insulating block 122 may be bonded and fixed to the secondary barrier 13 to be described later by bonding or the like, or it may be fixed to the hull by bolting or the like.

The primary insulating wall 12 is disposed in the closed space between the primary barrier 11 and the secondary barrier 13, and the space in which the primary insulating wall 12 is arranged may form an insulating space, The insulating space in which the insulating wall 12 is disposed may be referred to as an Interbarrier Space (IBS).

The primary heat insulating wall 12 provided at the highest position may be located below the upper wall 22 of the dome coaming 20a to be described later. This is because the connection barrier 24 must be constructed for sealing between the upper wall 22 and the secondary barrier 13 of the dome coaming 20a.

That is, according to the construction sequence, the secondary barrier 13 is provided on the secondary thermal insulation wall 14 and the primary thermal insulation wall 12 is provided in the secondary barrier 13, the uppermost primary thermal insulation wall ( 12) is positioned below the upper wall 22 to expose a portion of the secondary barrier 13. At this time, as the connecting barrier 24 is installed between the exposed secondary barrier 13 and the upper wall 22 , the dome coaming 20a and the secondary barrier 13 are mutually sealed and connected.

Thereafter, the finished insulating wall 12a may be filled in the gap between the uppermost primary insulating wall 12 and the upper wall 22 of the dome coaming 20a to cover the connection barrier 24 . The finished insulating wall 12a may have a structure including a plywood (not shown) and an insulating block (not shown) in the same/similar manner to the primary insulating wall 12 .

The inner surfaces of the primary insulating wall 12 and the finished insulating wall 12a may be provided side by side, and the primary barrier 11 on the inner surface of the primary insulating wall 12 and the finishing insulating wall 12a. ) can be installed.

The secondary barrier 13 is provided outside the primary heat insulating wall 12 . The secondary barrier 13 has a sealing function to prevent leakage of liquefied gas together with the primary barrier 11, and the secondary barrier 13 prevents leakage of liquefied gas when the primary barrier 11 is damaged. will prevent

The secondary barrier 13 may be made of the same/similar metal material as the primary barrier 11 , or may be made of a material different from that of the primary barrier 11 . For example, the secondary barrier 13 may be formed of a composite sheet in which a glass fiber sheet is laminated on both sides of a metal sheet or, conversely, a composite sheet in which a metal sheet is laminated on both sides of the glass fiber sheet. Alternatively, the secondary barrier 13 may be made of a metal material such as SUS or INVAR.

The secondary barrier 13 may be laminated on the secondary thermal insulation wall 14 . However, in order to seal the gap between the secondary insulating walls 14, a separate secondary barrier 13 is stacked, and the secondary barrier 13 on the secondary insulating wall 14 is made of a relatively rigid material and , the secondary barrier 13 between the secondary insulating walls 14 may be made of a relatively flexible material in preparation for contraction and expansion.

The secondary heat insulating wall 14 is arrange|positioned on the outer side of the secondary barrier 13. As shown in FIG. The secondary thermal insulation wall 14 has a thermal insulation function like the primary thermal insulation wall 12, and has a structure in which the plywood 141 and the thermal insulation block 142 are laminated in the same/similar manner to the primary thermal insulation wall 12. is done

However, the stacking order of the plywood 141 and the insulating block 142 of the secondary insulating wall 14 may be opposite to that of the primary insulating wall 12 . The primary insulating wall 12 is provided on the inner surface of the plywood 121 provided with an anchoring unit for welding fixing of the primary barrier 11, while the secondary insulating wall 14 is for fixing to the hull side. The plywood 141 may be provided on the outer surface.

The secondary heat insulation wall 14 may be fixed to the inner surface of the hull using a bolt (not shown), and may also be fixed using a mastic 143 . The mastic 143 is an adhesive and fixes the plywood 141 of the secondary heat insulating wall 14 to the hull.

The secondary thermal insulation wall 14 is disposed within the closed space between the secondary barrier 13 and the hull, and the space in which the secondary thermal insulation wall 14 is arranged may be referred to as an IS (Insulation Space) as a secondary thermal insulation space. have.

That is, the wall 10 goes from the inside to the outside in the order of the primary barrier 11 - IBS (primary insulating wall 12) - secondary barrier 13 - IS (secondary insulating wall 14) - hull. It is provided to be laminated, and the insulating space of IBS and IS is closed by a dome 20 to be described later.

As such, the storage space of the liquefied gas storage tank 1 can be formed by the wall 10 having the double barrier and the double insulating wall (insulation space). The wall 10 is made up of a flat surface, a curved surface, an inclined surface, etc. to form a storage space of various shapes.

The dome 20 is provided on the wall 10 forming the upper surface of the storage space. The wall 10 forming the storage space has an open upper surface for the inflow and outflow of liquefied gas or boil-off gas, and a dome 20 is installed in the opened portion to finish.

In this case, the wall 10 constituting the upper surface of the storage space may be provided to protrude upward at a predetermined height from the opened portion to form a protrusion (not shown), and a dome 20 may be installed at the upper end of the protrusion.

The dome 20 closes the insulating space formed in the wall 10 . The insulating space is provided on the inside and outside of the secondary barrier 13 in the wall 10 as described above, and the dome 20 can be closed to separate each insulating space from each other.

The dome 20 includes a dome coaming 20a that is fixedly installed on the wall 10 extending upward from the upper surface of the storage space. The dome coaming 20a is provided in the form of a hollow column and may have, for example, a square column shape.

The dome coaming 20a can be a closed space while the IBS and the IS are separated from each other through a specific structure to be described later. of inflow and outflow can be implemented.

A dome cover (not shown) may be provided above the dome coaming 20a. The dome cover may be disposed such that a line through which liquefied gas or boil-off gas can flow in and out, and the upper end of the pump tower (not shown) is fixedly installed on the dome cover.

Hereinafter, the structure of the dome 20 of each embodiment will be described in detail with reference to FIG. 2 and the like. However, it should be noted that the structure of the dome 20 described below is the structure of the dome coaming 20a.

For reference, in the following description of the second embodiment, it is to be mainly described that the embodiment is different from the previous content, and the omitted part is replaced with the previous content.

2 to 6 are partial cross-sectional views of the liquefied gas storage tank according to the present invention, and Figures 2 to 6 show the first to seventh embodiments, respectively.

2 is a partial cross-sectional view of a liquefied gas storage tank according to a first embodiment of the present invention.

2, the dome 20 of the liquefied gas storage tank 1 according to the first embodiment of the present invention has an outer wall 21, an upper wall 22, a support 23, and a connection barrier 24. include

The outer wall 21 has a predetermined height above the storage space. The outer wall 21 may be provided in parallel with the outer surface of the protrusion, and may be integrally fixed with the hull. It is also possible that a portion of the hull is provided to replace the outer wall 21 .

The outer wall 21 may be provided in the form of a polygonal column, and may be provided so that lines pass through each side thereof. However, lines for supplying nitrogen to the insulating space/discharging nitrogen from the insulating space may be provided opposite each other in the dome coaming 20a.

A horizontal reinforcement 211 may be provided on the outside of the outer wall 21 . According to the height at which the outer wall 21 extends upward, the structural strength of the dome coaming 20a is secured by adding a reinforcing material 211 around the outer periphery of the outer wall 21 .

In this case, the reinforcement 211 may be disposed between the trunk deck and the upper wall 22 of the hull. Of course, when the height of the outer wall 21 extending between the trunk deck and the upper wall 22 is not high, the reinforcing material 211 may be omitted, and the trunk deck may serve as the reinforcing material 211 .

The upper wall 22 is supported by the outer wall 21 and at least a part of the dome cover is seated thereon. The upper wall 22 may be configured to be vertically fixed to the upper end of the outer wall 21 , and may be provided horizontally and parallel to the wall 10 constituting the upper surface of the storage space.

The upper wall 22 may be provided in a shape protruding to the outside of the outer wall 21 , and a dome cover may be inserted therein. In addition, the width of the upper wall 22 may be provided to be at least equal to or greater than the thickness of the wall 10 , thereby covering the insulating spaces of the wall 10 .

The outer end of the upper wall 22 is provided to protrude outward compared to the outer wall 21, and a vertical web member (not shown), etc. is provided between the upper wall 22 and the reinforcing material 211 to increase structural strength. .

A primary barrier 11 may be connected to the inner side of the upper wall 22 . To this end, a first step removing means 221 is provided at the inner end of the upper wall 22 . The first step removing means 221 may be a structure having a U-shape consisting of an upper surface and a lower surface and a vertical surface therebetween, and the upper surface may be superimposed on the inner end of the upper wall 22 and fixed.

However, since the height of the primary step removing means 221 may be greater than the thickness of the upper wall 22, the fixing end 222 is provided to firmly fix the first step removing means 221 to the inner end of the upper wall 22. can be used The fixed end 222 extends downward from the inner end of the upper wall 22 , so that both the upper and lower surfaces of the first step removing means 221 are fixed to the upper wall 22 .

The support 23 extends downward from the upper wall 22 outside the outer wall 21 and inside. The support 23 is used to separate the inner insulation space IBS of the secondary barrier 13 and the outer insulation space IS of the secondary barrier 13 when covering the insulation spaces through the upper wall 22 . can

The support 23 is connected to the secondary barrier 13 through a connection barrier 24 to be described later, and the outer insulating space of the secondary barrier 13 communicates with the outside of the support 23 and the secondary barrier 13 The inner insulation space of the is communicated with the inner side of the support (23). However, since the upper end of the support 23 is fixed to the upper wall 22 , the support 23 divides the insulating space in the inner and outer directions.

The support 23 may be provided to have a vertical portion 231 and a protrusion 234 . The vertical portion 231 is provided to extend downward from the lower surface of the upper wall 22 . At this time, the vertical portion 231 is provided parallel to the secondary barrier 13 from the outside compared to the secondary barrier 13 and is provided parallel to the outer wall 21 from the inside compared to the outer wall 21 .

In order to secure a stable structure when the dome cover through which various lines pass is seated on the dome coaming 20a , the support 23 may extend downward from the upper wall 22 at a point outside the secondary barrier 13 . At this time, in order to interconnect the support 23 and the secondary barrier 13 to seal the insulating space outside the secondary barrier 13, the present embodiment may include a protrusion 234 on the support 23, etc. A block material 2341 may be provided between the vertical portion 231 and the protrusion 234 . According to the drawing, the block material 2341 may have a height between the protrusion 234 and the secondary heat insulating wall 14 .

The protrusion 234 is provided to protrude inward from one point of the vertical part 231 . The protrusion 234 and the vertical portion 231 may have a ⅓ or T shape, but the protrusion angle of the protrusion 234 may be a right angle or an acute angle with respect to the vertical portion 231 .

The inner end of the protrusion 234 may be disposed outside the secondary barrier 13 , and a block material 2341 may be fixed to the lower surface of the protrusion 234 by bonding or the like. At this time, the connection barrier 24 is provided such that the lower end is fixed to the secondary barrier 13 and the upper end is fixed to the inner surface of the block material 2341 to cover between the support 23 and the secondary barrier 13 .

In this embodiment, the support 23 and the secondary barrier 13 can be closed by using the block material 2341 . In this case, the block material 2341 may be provided in a form in which the sealing layer 2342 is surrounded on the inner surface and upper and lower surfaces.

That is, in the support 23 , the block material 2341 provided in the space between the inner side of the vertical portion 231 and the lower side of the protrusion 234 is sealed by the sealing layer 2342 of the upper surface contacting the lower surface of the protruding portion 234 . and the lower surface of the sealing layer 2342 is connected to the upper surface of the secondary heat insulating wall 14 . In addition, the sealing layer 2342 provided on the inner surface of the block material 2341, the upper end of the connection barrier 24 is fixed.

The sealing layer 2342 may use the same material as the connection barrier 24 , and may implement airtight maintenance like the connection barrier 24 .

The connection barrier 24 separates the insulating space inside and outside the secondary barrier 13 by sealing between the secondary barrier 13 and the support 23 . The connection barrier 24 may be made of the same/similar material as the secondary barrier 13 , but may be made of a flexible material compared to the secondary barrier 13 provided on the secondary heat insulating wall 14 .

The connection barrier 24 may be made of a material that can be bent during installation, and for example, the connection barrier 24 may be made of a composite sheet in which glass fiber sheets are laminated on both sides of a metal sheet.

The connecting barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner sealing layer 2342 of the block material 2341, and the connecting barrier 24 is not fixed to the protrusion 234 but is flat. may be provided in the form. For example, the operator may first fix the lower end of the connection barrier 24 to the secondary barrier 13 , and then attach and fix the upper end to the inner sealing layer 2342 of the block material 2341 by bonding or the like.

At this time, the inner end of the protrusion 234 of the support 23 is located outside the secondary barrier 13, but the block material 2341 has an inner surface sealing layer 2342 to which the connection barrier 24 is fixed, the secondary barrier. (13) may be arranged side by side. Therefore, the connection barrier 24 is provided to flatly connect between the secondary barrier 13 and the inner surface sealing layer 2342 of the block material 2341, and may be made of a rigid material in addition to a flexible material.

In this embodiment, the sealing from the support 23 to the secondary barrier 13 is the vertical portion 231 of the support 23 , the protrusion 234 of the support 23 , and the upper surface sealing layer of the block material 2341 . 2342 , the inner sealing layer 2342 of the block material 2341 , the connection barrier 24 , and the secondary barrier 13 may be followed in this order.

For sealing, the sealing layer 2342 covering the upper and lower surfaces and the inner surface of the block material 2341 may be integrally formed to prevent gas leakage, and the lower surface of the block material 2341 is the inner surface of the block material 2341 . Since the portion is covered by the connection barrier 24 between the sealing layer 2342 and the secondary barrier 13, the sealing layer 2342 provided on the lower surface of the block material 2341 and in contact with the secondary insulating wall 14 is may be omitted.

In addition, the sealing layer 2342 may be omitted on the outer surface of the block material 2341 in contact with the vertical portion 231 . Accordingly, the sealing layer 2342 covered by the block material 2341 may form a U-shape.

The lower end of the connection barrier 24 is located above the height of the primary thermal insulation wall 12 , so that the primary thermal insulation wall 12 can be fixed to the secondary barrier 13 before construction of the connection barrier 24 . . Of course, the end insulation wall 12a may be constructed and finished on the connection barrier 24 constructed above the primary insulation wall 12 as described above.

Between the support 23 and the outer wall 21, an outer insulating material 25 may be provided. The outer insulating material 25 is filled between the outer wall 21 and the support 23 , and together with the secondary insulating wall 14 , a secondary insulating function can be implemented. However, the outer insulation 25 may be made of the same/similar material or a different material as the secondary insulation wall 14, for example, the outer insulation 25 may be made of glass wool, reinforced polyurethane foam, or the like.

The space in which the outer insulating material 25 is provided is an outer insulating space of the secondary barrier 13 and may be filled with a non-explosive gas such as nitrogen. For reference, the internal pressure may be set in the order of IS > storage > IBS, but is not limited thereto.

The outer insulating material 25 is filled in the space between the support 23 and the outer wall 21 , and may have a height extending from the upper wall 22 to the lower end of the support 23 . That is, the lower end of the outer heat insulating material 25 may be positioned below the vertical portion 231 to contact the secondary heat insulating wall 14 .

The outer insulating material 25 may be divided into at least two in consideration of construction efficiency, etc., may be integrated after construction, and may be partially made of different materials.

The inner heat insulating material 26 is fixed to the inside of the vertical portion 231 and has an inner surface parallel to the inner surface of the secondary barrier 13 or the connecting barrier 24 . The inner insulating material 26 compensates for the fact that the vertical portion 231 of the support 23 is skewed to the outside compared to the secondary barrier 13, and may be provided to secure a plane for installation of the finished insulating wall 12a. , may be filled between the protrusion 234 and the upper wall 22 .

The inner insulator 26 may be made of a material similar to that of the outer insulator 25 or may be made of a material in which wood is overlapped in multiple layers to secure fixing force. In the latter case, the inner heat insulating material 26 may be fixed using a stud 2311 provided in the inward direction to the vertical portion 231 and a fixture 262 (such as a nut) fixed to the stud 2311 .

The inner heat insulating material 26 has an outer surface corresponding to the support 23, and the outer surface extended when the outer surface of the primary heat insulation wall 12 laminated and installed on the inner surface of the secondary barrier 13 is extended upward. It may have a shape to fill the space provided between the supports 23 .

In addition, the inner heat insulating material 26 may be applied between the first step removing means 221 and the vertical portion 231 of the support 23 , and the like. The inner heat insulating material 26 may be provided in various ways to make the lower end of the upper wall 22 and the inner portion of the support 23 in a rectangular shape to install the finished heat insulating wall 12a, and may be partially made of different materials. can For example, the inner insulation 26 positioned between the vertical portion 231 and the protrusion 234 of the support 23 is provided with a wood material to secure a fixing force, and a first step removing means on the lower surface of the upper wall 22 ( The inner heat insulating material 26 provided on the outside of the 221 may be provided with a polyurethane material for a heat insulating effect.

In a state in which the inner heat insulating material 26 is provided, the finished heat insulating wall 12a is provided on the inside of the connection barrier 22 and the block material 2341, so that on the inner surface of the finished heat insulating wall 12a and the primary heat insulating wall 12 A primary barrier 11 may be installed.

As such, in this embodiment, in the dome coaming (20a), the support 23 is placed at the lower end of the upper wall 22 and the secondary barrier ( 13) and the support 23, but after the block material 2341 covered with the sealing layer 2342 is installed on the support 23, the upper end of the connection barrier 24 is not the support 23 but the block material By being fixed to the sealing layer 2342 of the 2341, the connection barrier 24 can be installed flat, so that workability can be improved.

In addition, this embodiment can cover the gap between the secondary heat insulating wall 14 , the block material 2341 and the secondary barrier 13 through the connection barrier 24 , thereby maintaining gas tightness. In addition, this embodiment is effective in maintaining airtightness by using the block material 2341, structurally strong and the risk of damage is small.

3 is a partial cross-sectional view of a liquefied gas storage tank according to a second embodiment of the present invention.

Referring to FIG. 3 , the liquefied gas storage tank 1 according to the second embodiment of the present invention has a form in which the support 23 extends inwardly from the outer wall 21 rather than the upper wall 22 .

The support 23 may extend inwardly from the outer wall 21 at the lower side of the upper wall 22, and specifically, the support 23 includes a horizontal portion 235 extending inwardly from the outer wall 21, and a horizontal portion ( It may have a vertical portion 231 extending downward from the inner end of the 235 and parallel to the outer wall 21 .

In addition, the support 23 including the horizontal portion 235 and the vertical portion 231 extends inward from the inner end of the L-shaped outer portion 2351 and the outer portion 2351 extending inward from the outer wall 21 and It may be interpreted as including an inner portion 2352 of a L-shape that is vertically bent.

The support 23 is provided with a block material 2341 on the lower side of the horizontal portion 235 and on the outside of the vertical portion 231 . The block material 2341 may be provided with an inner metal strip 2343 on the inner surface, and a plywood (not shown) may be laminated on the inner surface for installation of the inner metal strip 2343 .

The block material 2341 may be disposed between the support 23 and the secondary heat insulating wall 14 , and is fixed to the inner surface of the outer wall 21 . In addition, the inner metal strip 2343 provided on the inner surface of the block material 2341 is provided in parallel with the secondary barrier (13).

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner metal strip 2343 of the block material 2341, and the support 23 has a vertical portion 231 with an inner metal strip ( 2343) can be fixed. In this case, the vertical portion 231 and the connection barrier 24 may be respectively fixed to the inner metal strip 2343 with a vertical gap therebetween.

However, since the inner metal strip 2343 is also made of a metal material and can implement a barrier function, there is no risk of leakage between the support 23 - the inner metal strip 2343 - the connection barrier 24. Of course, it is also possible for the support 23 and the connecting barrier 24 to be superposedly fixed on the inner metal strip 2343 . The inner metal strip 2343 may serve to connect between the connection barrier 24 and the vertical portion 231 and to perform a sealing role.

In addition, the block material 2341 may be provided with an upper metal strip 2344 on the upper surface of which the horizontal portion 235 of the support 23 is fixed. As described above, the support 23 may be provided in a structure in which the separately provided outer part 2351 and the inner part 2352 are connected. ) may allow the inner metal strip 2343 to be seated.

At this time, the portion where the inner portion 2352 and the outer portion 2351 overlap may be a position on the upper metal strip 2344, and the inner portion 2352 and the outer portion 2351 may be connected to each other by sealing through the upper metal strip 2344. .

Of course, as previously mentioned for the inner metal strip 2343, the inner portion 2352 and the outer portion 2351 are connected to the upper metal strip 2344 with a gap in the inner and outer directions, and the outer portion 2351 - the upper metal strip 2344 ) - It is also possible to have a structure in which there is no risk of leakage between the inner part 2352 .

In the case of the upper metal strip 2344, a role of fixing the inner part 2352 and, at the same time, a role of preventing burn damage of the back surface when the outer part 2351 is installed can be implemented.

In this embodiment, the support 23 is provided to extend inwardly from the outer wall 21 rather than the upper wall 22 , and the inner insulating material 26 may be filled between the support 23 and the upper wall 22 .

The connection barrier 24 , the inner portion 2352 , and the inner thermal insulation material 26 , etc. may be covered by the finished thermal insulation wall 12a , and the finished thermal insulation wall 12a is a primary barrier together with the primary thermal insulation wall 12 . (11) can form the inner surface to be installed.

In addition, when the outer portion 2351 in the support 23 is disposed to overlap the inner portion 2352 vertically, a gap may be formed between the outer portion 2351 and the block material 2341 by the thickness of the inner portion 2352. The outer insulation 25 may be filled. Alternatively, the outer insulating material 25 may be omitted in this embodiment.

As such, in this embodiment, the lower end of the support 23 extending inward from the outer wall 21 and the upper end of the connecting barrier 24 by using the block material 2341 having the inner metal strip 2343 form a gap. Sufficient sealing can be implemented while allowing indirect connection. In addition, due to the overlapping structure of the connecting barrier 14 and the upper metal strip 2344 and the support 23, it is possible to efficiently maintain the gas tightness.

4 is a partial cross-sectional view of a liquefied gas storage tank according to a third embodiment of the present invention.

Referring to Figure 4, the liquefied gas storage tank 1 according to the third embodiment of the present invention, the support 23 and the connection barrier 24 using a block material 2341 having an inner metal strip 2343 make it connect

However, in this embodiment, the support 23 may extend downward from the upper wall 22 on the inner side of the outer wall 21 . In addition, the support 23 may include a vertical portion 231 and a bent portion 233, the bent portion 233 may be provided with a secondary step difference removing means 236.

The lower end of the support 23 may be spaced apart upward relative to the secondary thermal insulation wall 14 , so that a gap may be formed between the bent portion 233 and the secondary thermal insulation wall 14 . At this time, at least a portion of the second step removing means 236 may be positioned in the gap, and the block material 2341 may be seated therein.

The second step canceling means 236 may have a U-shape similar to the first step canceling means 221 , and for fixing the second step canceling means 236 , the bending portion 233 has a fixed end 237 . This may be provided, and the lower surface of the secondary step removing means 236 may be fixed to the bent portion 233 by the fixing end 237 .

In addition, the upper surface of the secondary step removing means 236 may be fixed to overlap the upper surface of the bent portion 233 , and the inner surface of the second step removing means 236 is the secondary barrier 13 / block material 2341 . It may be provided in parallel with the inner metal strip 2343 .

The block material 2341 is disposed between the bent portion 233 of the support 23 and the secondary heat insulating wall 14, and an inner metal strip 2343 is provided on the inner surface. This block material 2341 may be fixed to the inner surface of the outer wall 21, and the inner metal strip 2343 of the inner surface is to be provided in parallel with the inner surface of the secondary barrier 13 / second step removing means 236. can

The connection barrier 24 may have a lower end fixed to the secondary barrier 13 , via an inner metal strip 2343 of a block material 2341 , and an upper end fixed to the support 23 . Specifically, the connection barrier 24 may be fixed to the inner surface of the secondary step difference removing means 236 provided on the upper end of the support 23 .

In addition, the connection barrier 24 may include a lower connection barrier 241 and an upper connection barrier 242 . The lower connection barrier 241 may have a lower end fixed to the secondary barrier 13 and an upper end connected to the inner metal strip 2343 of the block material 2341 . In addition, the upper metal barrier has a lower end connected to the inner metal strip 2343 of the block material 2341 and an upper end connected to the inner surface of the secondary step removing means 236 of the support 23 .

In this case, the lower connection barrier 241 may be made of a softer material compared to the upper connection barrier 242, for example, the lower connection barrier 241 may be made of a composite sheet, and the upper connection barrier 242 may be made of a metal sheet such as SUS. have. At this time, the upper connection barrier 242 may be referred to as a closing member for sealing between the secondary step removing means 236 and the inner metal strip 2343 of the block material 2341, and only the lower connection barrier 241 is a connection barrier. (24) may also be referred to. Meanwhile, although not shown in FIG. 4 , the connection barrier 24 may be integrally configured as one.

Here, the upper end of the lower connection barrier 241 and the lower end of the upper connection barrier 242 may be fixed with a gap vertically in the inner metal strip 2343 of the block material 2341 . That is, between the support 23 and the secondary barrier 13 is a bent portion 233 - the second step removing means 236 - the upper connecting barrier 242 - the inner metal strip 2343 - the lower connecting barrier 241 - It is sealed in the order of the secondary barrier (13).

Accordingly, in this embodiment, the secondary barrier 13, the inner metal strip 2343, and the inner surface of the secondary step removing means 236 are all arranged on one plane without a step, while the secondary barrier 13 and the inner metal The strip 2343, the inner metal strip 2343, and the secondary step removing means 236 are connected with separate connection barriers 24, respectively, so that the connection barrier 24 is provided flat, so that the rigid connection barrier 24 ) can be used.

Of course, in this embodiment, it is also possible so that the lower connection barrier 241 and the upper connection barrier 242 are overlapped and fixed on the inner metal strip 2343 . However, in this case, since a step is formed at a portion where the lower connecting barrier 241 and the upper connecting barrier 242 overlap each other, the connecting barrier 24 may be made of a material that can be bent.

An inner heat insulating material 26 having an appropriate shape or material may be installed between the support 23 and the upper wall 22 , and a finished heat insulating wall 12a is installed inside the connection barrier 24 to form the primary barrier 11 ) can be constructed.

As such, this embodiment utilizes the block material 2341 having the inner metal strip 2343 between the support 23 and the secondary heat insulating wall 14 and divides the connection barrier 24 up and down to seal, so that a flat Sealing via the connecting barrier 24 is possible.

In addition, in this embodiment, the connection barrier 24 is between the secondary barrier 13 and the support 23 through the configuration of the inner metal strip 2343 of the block material 2341, the secondary step removing means 236, etc. It is sealed and can effectively secure gas tightness.

5 is a partial cross-sectional view of a liquefied gas storage tank according to a fourth embodiment of the present invention.

Referring to FIG. 5 , in the liquefied gas storage tank 1 according to the fourth embodiment of the present invention, the support 23 is provided to extend inwardly from the outer wall 21 rather than the upper wall 22 .

At this time, the support 23 has a horizontal portion 235 extending inwardly from the outer wall 21 and a vertical portion 231 fixed to the inner end of the horizontal portion 235 and parallel to the outer wall 21 . In addition, the support 23 including the vertical portion 231 and the horizontal portion 235 may form an L or T shape.

The horizontal portion 235 of the support 23 is vertically provided on the outer wall 21 . At this time, the external wall 21 is provided with the above-described horizontal reinforcing material 211, and the support 23 has the horizontal portion 235 and the reinforcing material 211 provided in parallel on the same line, so that stress concentration can be avoided. . That is, the support 23 , the outer wall 21 , and the reinforcing material 211 may form a + shape. However, with the outer wall 21 interposed therebetween, the horizontal portion 235 and the reinforcing material 211 may be installed intermittently instead of continuously.

The vertical portion 231 of the support 23 is provided with an inner surface parallel to the secondary barrier 13 . At this time, the upper end of the connection barrier 24 may be fixed to the inner surface of the vertical portion 231 , and the vertical portion 231 has a height sufficient to sufficiently secure the fixing force of the connection barrier 24 .

The connection barrier 24 has a lower end fixed to the secondary barrier 13 and an upper end fixed to the inner surface of the vertical portion 231 . Since the inner surface of the secondary barrier 13 and the vertical part 231 may be provided side by side, the connection barrier 24 may seal flatly between the secondary barrier 13 and the support 23 . In this case, the connection barrier 24 may select a rigid material such as metal in addition to the soft material.

A gap is formed between the vertical portion 231 of the support 23 and the secondary insulating wall 14 , and the gap is covered by the connecting barrier 24 . However, compared to the vertical portion 231 and the secondary insulating wall 14 of the support 23 , a relatively large gap is formed between the horizontal portion 235 and the secondary insulating wall 14 of the support 23 .

Therefore, a block material 2341 may be provided between the horizontal portion 235 of the support 23 and the secondary heat insulating wall 14 . The block material 2341 may not be filled in the gap between the vertical portion 231 and the secondary heat insulating wall 14 but may be provided in a form provided only outside the vertical portion 231 .

Of course, the block material 2341 may also be provided to be filled between the vertical portion 231 and the secondary insulating wall 14, in this case, the inner surface of the block material 2341 is parallel to the secondary barrier 13 or secondary It may be located outside the barrier 13 .

An inner heat insulating material 26 may be provided between the horizontal portion 235 and the upper wall 22 , and the inner heat insulating material 26 includes a portion disposed between the horizontal portion 235 and the vertical portion 231 , and disposed thereon. The parts to be used may be made of different materials and may be provided.

The connection barrier 24, the upper end portion of the vertical portion 231 where the connection barrier 24 is not provided, and the inner side of the inner insulation material 26 provided above the horizontal portion 235, etc. 12a) is provided, and the primary barrier 11 may be seated on the inner surfaces of the primary insulating wall 12 and the finished insulating wall 12a.

As such, this embodiment extends the support 23 horizontally on the opposite side of the horizontal reinforcement 211 from the outer wall 21, and the secondary barrier 13 and the support through the vertical portion 231 of the support 23 By sealing the space between (23) by the connection barrier (24), it is possible to simplify the structure and minimize the risk of leakage.

In addition, the present embodiment greatly simplifies the sealing finishing structure of a complex shape, thereby shortening the working period, and maximizing the sealing effect by increasing the fixing (adhesive) area of the connection barrier 24 .

6 is a partial cross-sectional view of a liquefied gas storage tank according to a fifth embodiment of the present invention.

Referring to FIG. 6 , the liquefied gas storage tank 1 according to the fifth embodiment of the present invention includes a support 23 having a vertical portion 231 and a bent portion 233 similarly to FIG. 4 , and A second step difference removing means 236 is provided at the inner end of the bent portion 233 . At this time, the lower surface of the secondary step removing means 236 is fixed by the fixed end 237 installed in the bent portion 233 , and the upper end of the connecting barrier 24 is fixed to the second step removing means 236 .

However, in this embodiment, unlike FIG. 4 , the block material 2341 may not be used, and in the structure in which the connection barrier 24 and the secondary barrier 13 are mutually fixed on the secondary heat insulating wall 14, FIG. is different from

Specifically, in this embodiment, the groove 145 is provided on the inner surface of the secondary heat insulating wall 14 of the wall 10, and the secondary barrier from the inner surface of the secondary heat insulating wall 14 to the lower end of the groove 145. (13) is provided.

At this time, the connection barrier 24 has a lower portion inserted and fixed into the groove 145 , and a lower end extending below the groove 145 to be fixed to the secondary barrier 13 , and the upper end to the secondary step removing means 236 . It is fixed and can be connected by sealing between the secondary barrier 13 and the support 23 .

In particular, the connection barrier 24 includes a lower connection barrier 241 that is bent so as to protrude outward and inserted into the groove 145 , the lower end of which extends below the groove 145 , and is fixed to the secondary barrier 13 . At this time, the lower connection barrier 241 may be in close contact with the inner surface of the groove 145 and the metal material 243 is fixed.

The metal material 243 is inserted into the lower connection barrier 241 in the groove 145 to fix the lower connection barrier 241 to the groove 145 . As the metal material 243 is inserted into the groove 145 , the lower connection barrier 241 may be press-fitted into the groove 145 to be fixed.

At this time, the connecting barrier 24 includes an upper connecting barrier 242 having a lower end fixed to the inner surface of the metal material 243 and an upper end fixed to the secondary step difference canceling means 236 . That is, between the secondary barrier 13 and the secondary step removing means 236, the secondary barrier 13 - the lower connection barrier 241 - the metal material 243 - the upper connection barrier 242 is connected in the order of sealing.

At this time, the inner surface of the metal material 243 is provided parallel to the inner surface of the second step canceling means 236, so that the upper connection barrier 242 is flatly sealed between the metal material 243 and the second step canceling means 236. It can be done, and the upper connection barrier 242 can be made of a rigid material in addition to a flexible material.

However, since the lower connection barrier 241 must be fixed by being inserted into the groove 145 through the metal material 243, the lower connection barrier 241 is made of a flexible material compared to the upper connection barrier 242, or the upper connection barrier 242 It may be made of a flexible material in the same way as that of

In the present embodiment, the second step removing means 236 may be spaced upward compared to the second insulating wall 14 as in FIG. 4 , and the second step removing means 236 and the second insulating wall 14 . An outer insulation 25 is used to close the gap.

At least a portion of the outer insulating material 25 may be filled between the outer wall 21 and the support 23 , and may have a shape protruding inward between the support 23 and the secondary insulating wall 14 . In this case, the portion protruding inward from the outer heat insulating material 25 may be provided in parallel with the secondary heat insulating wall 14 to support the upper connection barrier 242 .

One or more inner insulation materials 26 having an appropriate shape and material may be installed between the support 23 and the upper wall 22 , and the finished insulation wall 12a may be provided in the inner insulation material 26 . The finished insulating wall 12a may be provided to cover both the upper connecting barrier 242 and the lower connecting barrier 241 while covering the inner insulating material 26 and the secondary step removing means 236 .

As such, this embodiment utilizes the groove 145 and the metal material 243 fitting structure when fixing the connection barrier 24 to the secondary barrier 13, the lower end of the upper connection barrier 242 and the metal material 243 ) between the support 23 and the secondary barrier 13 can be sealed by welding.

Of course, the present invention may include a combination of at least any one or more embodiments and known techniques known to those skilled in the art, or a combination of at least two or more embodiments, as additional embodiments, in addition to the embodiments described above.

Although the present invention has been described in detail through specific examples, it is intended to describe the present invention in detail, and the present invention is not limited thereto, and by those of ordinary skill in the art within the technical spirit of the present invention It will be clear that the transformation or improvement is possible.

All simple modifications or changes of the present invention fall within the scope of the present invention, and the specific scope of protection of the present invention will be made clear by the appended claims.

1: liquefied gas storage tank 10: wall
11: primary barrier 12: primary insulation wall
121: plywood 122: insulation block
12a: finishing insulation wall 13: secondary barrier
14: secondary insulation wall 141: plywood
142: insulation block 143: mastic
145: home 20: dome
20a: dome coaming 21: exterior wall
211: reinforcement 22: upper wall
221: first step difference removing means 222: fixed end
23: support 231: vertical part
2311: stud 233: bend
234: protrusion 2341: block material
2342: sealing layer 2343: inner metal strip
2344: upper metal strip 235: horizontal
2351: outer part 2352: inner part
236: second step difference removing means 237: fixed end
24: connecting barrier 241: lower connecting barrier
242: upper connection barrier 243: metal material

Claims (6)

A metal primary barrier forming a storage space for accommodating liquefied gas, a primary insulating wall disposed outside the primary barrier, a secondary barrier provided outside the primary insulating wall; a wall including a secondary heat insulating wall disposed outside the primary barrier, the wall forming an insulating space between the primary barrier and the secondary barrier and outside the secondary barrier; and
and a dome provided on the wall forming the upper surface of the storage space to close the insulating space,
The dome is
an outer wall having a predetermined height above the storage space;
an upper wall supported by the outer wall and connected to an inner end of the primary barrier;
a support extending downwardly from the upper wall on the inner side of the outer wall; and
a connection barrier sealing between the secondary barrier and the support;
The support, the lower end is spaced apart upward compared to the secondary insulation wall,
Between the support and the secondary insulating wall, a block material having a metal strip on its inner surface is seated,
The connection barrier, the lower end is fixed to the secondary barrier and the upper end is fixed to the support via the metal strip of the block material,
The block material is fixed to the inner surface of the outer wall,
The connection barrier includes a lower connection barrier having a lower end fixed to the secondary barrier and an upper end connected to the metal strip of the block material, and an upper connection having a lower end connected to the metal strip of the block material and an upper end connected to the support Liquefied gas storage tank comprising a barrier. delete According to claim 1, wherein the upper end of the lower connection barrier and the lower end of the upper connection barrier,
Liquefied gas storage tank, characterized in that it is fixed with a gap up and down in the metal strip of the block material. According to claim 1, wherein the support,
A secondary U-frame positioned outside the secondary barrier and having a vertical portion parallel to the outer wall, a bent portion bent inward from the lower portion of the vertical portion, and in which the connection barrier is fixed to the inner surface of the second U-frame is the inner side of the bent portion Liquefied gas storage tank, characterized in that provided at the stage. 5. The method of claim 4, wherein the secondary U-frame,
A liquefied gas storage tank, characterized in that the upper surface is superimposed on the bent part so that the inner surface is parallel to the metal strip. A ship comprising the liquefied gas storage tank of any one of claims 1, 3 to 5.

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