KR20200091989A - Insulation System of Liquefied Natural Gas Storage Tank - Google Patents

Abstract

Disclosed is an insulation system of a liquefied natural gas storage tank, which can effectively prevent damage to a metal membrane. According to the present invention, the insulation system of a liquefied natural gas storage tank, which includes an insulation wall consisting of a plurality of insulation panels and a sealing wall installed on the insulation wall to seal liquefied natural gas, comprises: a transverse connector installed at a corner portion of the storage tank to support the sealing wall so as to transfer a load applied to the sealing wall to a hull; an insulation box installed on the corner portion of the storage tank to support the transverse connector; and a space insulation member inserted and arranged in a gap formed between the insulation box and an insulation panel (border panel) arranged closest to the corner portion of the storage tank among the insulation panels. The plurality of insulation panels are provided as sandwich panels made of a compound of an insulator and plywood. The border panel is made of high-density polyurethane foam in comparison to the rest of the insulation panels. The space insulation member is provided to have an average thermal contraction amount of the insulation box and the border panel to sequentially allow structural stiffness of the insulation wall at the corner portion of the storage tank.

Description

Insulation system of liquefied natural gas storage tank {Insulation System of Liquefied Natural Gas Storage Tank}

The present invention relates to a thermal insulation system of a liquefied natural gas storage tank, and more specifically, when arranging a thermal insulation system having a difference in stiffness for each zone at a corner of the liquefied natural gas storage tank, a different type of thermal insulation layer (an insulating box and Insulation panel) to minimize the occurrence of a step at the boundary, to effectively prevent the damage of the metal membrane liquefied natural gas storage tank insulation system.

Natural gas is transported in gaseous form through on-shore or offshore gas piping, or transported to remote consumers while stored on LNG carriers in the form of liquefied natural gas (LNG). LNG is obtained by cooling natural gas to a very low temperature (approximately -163°C), and its volume is reduced to approximately 1/600 compared to natural gas in a gas state, so it is very suitable for long-distance transportation through sea.

A storage tank (commonly referred to as a'cargo') is installed in a structure for transporting or storing LNG, such as an LNG carrier for loading and unloading LNG to land-based destinations by carrying LNG.

LNG storage tanks can be classified into an independent tank type and a membrane type according to whether a load of a cargo directly acts on an insulating material. Typically, the membrane type storage tank is divided into GTT's NO 96 type and MARK III type, and the independent tank type storage tank is divided into MOSS type and IHI-SPB type.

Among the membrane-type storage tanks, NO 96-type storage tanks are primary and secondary sealing walls made of 0.5 to 0.7 mm thick Invar (36% nickel steel) membrane, and perlite in a plywood box. It includes primary and secondary insulating walls provided in the form of insulating boxes filled with insulating materials such as powder.

In the NO 96 storage tank, the primary sealing wall and the secondary sealing wall have almost the same degree of liquid tightness and strength, and in the event of leakage of the primary sealing wall, the secondary sealing wall can safely support the cargo even with the secondary sealing wall for a considerable period of time.

In addition, since the NO 96 type storage tank is a type of insulating wall filled with insulating material inside a wooden box, it can have higher compressive strength and stiffness than the MARK III type storage tank, and it is easy to weld and has a high automation rate.

On the other hand, the MARK Ⅲ type storage tank includes a primary sealing wall made of a 1.2 mm thick stainless steel (SUS) membrane, a secondary sealing wall made of a triplex, and a top surface of a polyurethane foam or It includes primary and secondary insulating walls that are provided with insulating panels bonded to wooden plywood on the lower surface.

The primary sealing wall of the MARK Ⅲ type storage tank has a corrugated corrugated portion to absorb heat shrinkage by LNG in a cryogenic state, and since the corrugated corrugated portion absorbs the deformation of the membrane, there is no great stress in the membrane.

However, the MARK III storage tank has a disadvantage that stability is lower than that of the NO 96 storage tank because it is difficult to apply a corrugated stainless steel membrane to the secondary sealing wall due to interference with the insulating wall, so it applies a triplex.

MARK type III storage tanks have disadvantages in terms of installation/manufacturing due to low welding automation rate of the primary sealing wall having corrugated corrugations, but they are cheaper than stainless steel membranes and triplexes, and are easy to construct, compared to Invar membranes. Because of its excellent thermal insulation effect, it is widely used with NO 96 storage tanks.

Technical problem to be achieved by the present invention, when arranging an insulation system having a difference in stiffness for each zone in a corner portion of a liquefied natural gas storage tank, a step is generated at the boundary between different types of insulation layers (insulation box and insulation panel). It is to provide an insulation system for a liquefied natural gas storage tank that can effectively prevent damage to the metal membrane by minimizing the damage.

In order to achieve the above object, the present invention is a liquefied natural gas storage tank comprising an insulating wall made of a plurality of insulating panels and a sealing wall installed on the insulating wall to seal the liquefied natural gas, the storage A transverse connector installed at a corner of the tank to transfer the load applied to the sealing wall to the hull by supporting the sealing wall; An insulating box installed at a corner of the storage tank to support the transverse connection body; And a space insulation member inserted into a gap formed between an insulation panel (hereinafter referred to as a'border panel') disposed closest to a corner portion of the storage tank among the insulation box and the insulation panel, and the plurality of insulation The panel is provided with a sandwich panel made of a composite of a heat insulating material and a plywood, wherein the border panel is made of a polyurethane foam having the same or relatively high density as the rest of the insulation panel, and the space insulating member is the insulation box and the border. Provided to have the average heat shrinkage of the panel, it characterized in that the structural rigidity of the insulating wall in the corner portion of the storage tank of the storage tank sequentially, provides a heat insulating system of a liquefied natural gas storage tank.

The space insulation member may include a heat insulating material having a perpendicularity and a directionality of the heat insulating material constituting the heat insulating panel.

The heat insulating material constituting the heat insulating panel and the heat insulating material constituting the space insulating member are provided as either polyurethane foam (PUF) or fiber reinforced polyurethane foam (R-PUF), and the heat insulating material constituting the space insulating member is The in-plane direction may be formed in a direction perpendicular to the inner wall of the storage tank.

The insulating material constituting the border panel and the space insulation material is provided with a fiber-reinforced polyurethane foam having a density of 170 kg/m ³ or more, and the insulating material constituting the other insulating panels except the border panel is fiber reinforced with a density of 130 kg/m ³ or more. It can be provided with polyurethane foam.

The gap formed between the insulating box and the border panel may be formed at an interval of 5 to 20 times the gap formed between the insulating panels adjacent to each other.

A gap formed between the insulating panels adjacent to each other, the glass wool or polyurethane foam insulating material is further filled with a heat insulating panel connecting portion provided in a form or an empty space, and the space insulating member is 1.2 times to 4 of the insulating panel connecting portion. It can have material stiffness in the thickness direction of the ship.

In addition, the present invention, in order to achieve the above object, a secondary insulating wall made of a plurality of secondary insulating panels arranged on the inner wall of the hull, a secondary sealing wall installed on the secondary insulating wall, the secondary A liquefied natural gas storage tank including a primary insulating wall made of a plurality of primary insulating panels arranged on a sealing wall and a primary sealing wall installed on the primary insulating wall, the corner portion of the storage tank A transverse connecting body installed on the primary sealing wall and supporting the secondary sealing wall to transfer loads applied to the primary and secondary sealing walls to the hull; And an insulating box supporting the transverse connecting body, wherein the insulating box includes a primary corner box disposed adjacent to the primary insulating panel at the level of the primary insulating wall, and the secondary insulating wall. The secondary corner box includes a secondary corner box disposed adjacent to the secondary insulation panel at a level, and the secondary corner box is disposed above the primary corner box so that the primary insulation panel and the secondary insulation panel cross each other. It further protrudes to the outside of the transverse connecting body, it characterized in that the primary corner box and the secondary corner box is arranged in a staircase, to provide an insulation system of a liquefied natural gas storage tank.

The primary insulating panel and the secondary insulating panel are provided with a sandwich panel made of a composite of a heat insulating material and a plywood made of polyurethane foam, and the primary sealing wall and the secondary sealing wall may be made of a metal membrane.

The insulation system of the liquefied natural gas storage tank according to the present invention is disposed in a gap (a) formed between the primary corner box and the primary insulation panel, and the primary corner box and the first are disposed on both sides. A primary space insulation member having an average heat shrinkage of the heat insulation panel; And a secondary space having an average heat shrinkage between the secondary corner box and the secondary insulation panel, which are disposed in the gap (a') formed between the secondary insulation panel and the secondary corner box. It may further include an insulating member.

The primary space insulating member and the secondary space insulating member may include polyurethane foam insulating materials having directionality perpendicular to polyurethane foam insulating materials of adjacent primary insulating panels and secondary insulating panels, respectively.

The polyurethane foam insulating material included in the primary space insulating member and the secondary space insulating member may have an in-plane direction formed in a direction perpendicular to the inner wall of the storage tank.

The primary space insulating member and the secondary space insulating member may include at least one plywood whose thickness direction coincides with the thickness direction of the heat insulating layer.

The primary space insulating member and the secondary space insulating member may be provided in a form in which a plurality of plywood plywood whose thickness direction coincides with the thickness direction of the heat insulating layer is stacked.

According to the present invention, when arranging an insulation system having a difference in stiffness for each zone in a corner portion of a liquefied natural gas storage tank, the average heat shrinkage at the boundary of the insulation layer (insulation box and insulation panel) having a different arrangement and shape between the insulation panels. By arranging the spatial insulating material having a degree, the structural rigidity of the insulating layer at the corner portion of the storage tank is sequentially made, thereby minimizing the occurrence of a step due to the difference in heat shrinkage at the boundary of the insulating layer having a different shape.

In addition, according to the present invention, the spatial insulation material disposed at the boundary of the different shape of the insulation layer can be manufactured in consideration of the directionality of the material used in the existing thermal insulation system without adding additional materials, and the corresponding area in which the spatial insulation material is disposed is the hull of the hull. Since it is a flexible space according to manufacturing tolerances, the spatial insulation can also serve as a dimension insulation.

1 is a view showing an insulation system of a liquefied natural gas storage tank according to a first embodiment of the present invention.
2 is a view showing an insulation system of a liquefied natural gas storage tank according to a second embodiment of the present invention.
FIG. 3 is a view showing a heat insulating member and a heat insulating panel disposed next to the heat insulating system of the liquefied natural gas storage tank according to the second embodiment of the present invention.
4 is a view showing an insulation system of a liquefied natural gas storage tank according to a third embodiment of the present invention.
5 is a view showing an insulation system of a liquefied natural gas storage tank according to a fourth embodiment of the present invention.

In order to fully understand the present invention, the operational advantages of the present invention, and the objects achieved by the practice of the present invention, reference should be made to the accompanying drawings and the contents described in the accompanying drawings, which illustrate preferred embodiments of the present invention.

Hereinafter, the present invention will be described in detail by explaining preferred embodiments of the present invention with reference to the accompanying drawings. The same reference numerals in each drawing denote the same members.

In the present invention, the use of the terms'primary' and'secondary' is based on the LNG stored in the storage tank to function primarily to seal or insulate LNG, or to function to secondarily seal or insulate. It was used as a criterion for determining whether or not.

In addition, by convention, the term'upper' or'up' applied to the elements of the tank refers to the direction toward the inside of the tank, regardless of the direction to gravity, and likewise, the term'lower' or'down' refers to gravity It refers to the direction toward the outside of the tank regardless of the direction.

1 is a view showing a heat insulating system of a liquefied natural gas storage tank according to a first embodiment of the present invention, Figure 2 is a view showing a heat insulating system of a liquefied natural gas storage tank according to a second embodiment of the present invention, 3 is a view showing a heat insulating member and a heat insulating panel disposed next to the heat insulating system of the liquefied natural gas storage tank according to the second embodiment of the present invention.

In addition, Figure 4 is a view showing a heat insulating system of a liquefied natural gas storage tank according to a third embodiment of the present invention, Figure 5 is a view showing a heat insulating system of a liquefied natural gas storage tank according to the fourth embodiment of the present invention to be.

First, referring to Figures 1 to 5, the liquefied natural gas storage tank according to the present invention, the secondary insulating wall 100 consisting of a plurality of secondary insulating panels 110 arranged on the inner wall of the hull (H) and , Secondary insulating wall 200 installed on the secondary insulating wall 100, and a primary insulating wall 300 consisting of a plurality of primary insulating panels 310 arranged on the secondary sealing wall 200 And, it can be seen that the structure including a primary sealing wall 400 installed on the primary insulating wall 300.

The primary insulating panel 310 is made of a unit panel in the form of a hexahedron or more polyhedrons, so that a plurality of primary insulating panels 310 are arranged in the lateral and longitudinal directions on the secondary sealing wall 200. An insulating wall 300 may be formed.

The secondary insulating panel 110 is similarly made of a unit panel in the form of a hexahedron or more polyhedron, so that a plurality of secondary insulating panels 110 are arranged in the transverse and longitudinal directions on the inner wall of the hull H. Wall 100 may be formed.

The primary and secondary insulation panels 310 and 110 fly on both the upper and lower surfaces or upper and lower surfaces of the insulating materials 311 and 111, such as polyurethane foam (PUF) or fiber reinforced polyurethane foam (RPUF). Protective plates 312 and 112 made of wood or a composite material (for example, fiber-reinforced plastic) may be provided as a bonded sandwich panel.

The secondary insulating wall 100 may be fixed to the inner wall of the hull H by an adhesive or stud such as epoxy mastic, and the primary insulating wall 300 may be connected to the secondary insulating wall 100. In the state in which the secondary sealing wall 200 is interposed between the secondary sealing walls 310, the primary insulating panel 310 is coupled to a securing device provided on the upper portion of the secondary insulating panel 110. 200) can be fixed in close contact with the top.

The primary and secondary sealing walls 400 and 200 may be made of a metal membrane.

Primary and secondary sealing walls (400, 200), Invar (Invar), stainless steel (SUS), aluminum (Aluminum) alloy, etc., can be made by selectively adopting any one of a variety of metal materials resistant to low-temperature brittleness, , A flat or corrugated metal membrane.

In the present invention, as a preferred embodiment, the primary sealing wall 400 is made of a stainless steel (SUS) corrugated membrane, and the secondary sealing wall 200 is a liquefied natural gas composed of a flat membrane made of Invar. Provides a thermal insulation system.

The primary sealing wall 400 is a direct contact with LNG to be sealed, and may be provided with a stainless steel membrane including a plurality of corrugations formed in the inner direction of the storage tank, and a plurality of wrinkles formed on the membrane It absorbs shrinkage caused by cryogenic temperatures and prevents stress concentration.

The secondary sealing wall 200 may be formed of a flat invar membrane in a flat shape.

In addition, in the liquefied natural gas storage tank according to the present invention, a structure made of Invar steel may be installed at a corner of the storage tank so that the secondary sealing wall 200 is provided as a flat flat invar membrane. .

In general, since the flat invar membrane has a small heat shrinkage coefficient, it is not suitable to use an insulation panel made of a polyurethane foam and a plywood composite as an insulating wall. In order to apply a flat in-bar membrane, the insulating wall supporting the membrane, such as a conventional NO 96-type storage tank, must be composed of an insulation box with low heat shrinkage deformation and high rigidity.

However, in the present invention, by installing a transverse connector (transverse connector, 500) which is a structure made of Invar steel at the corner of the storage tank, the secondary insulating wall 100 is composed of an insulating panel made of polyurethane foam, It is possible to configure the secondary sealing wall 200 as a flat membrane.

Specifically, the transverse connecting body 500 is a lattice-shaped structure installed along the front wall and rear wall edges of the storage tank, one end of which is welded to the anchoring bar (anchoring bar) provided on the inner wall of the storage tank. It is fixedly installed at the corner, and the other end serves to support each end of the primary sealing wall 400 and the secondary sealing wall 200, thereby transferring various loads applied to them to the hull H.

As described above, a portion of the load applied to the primary and secondary sealing walls 400 and 200 by the transverse connector 500 installed at the corner of the storage tank is transferred to the hull H and resolved. It becomes possible to configure the secondary insulating wall 100 supporting the secondary sealing wall 200 provided as an insulating panel having weaker rigidity than the insulating box.

Therefore, the present invention can form a welding line in a straight line when installing the secondary sealing wall 200 on the upper portion of the secondary insulating wall 100, thereby enabling automation of welding to improve productivity. It has an effect.

In addition, according to the present invention, as the insulating walls 300 and 100 are made of polyurethane foam, the insulating performance is also excellent. The liquefied natural gas storage tank according to the present invention has the same insulating effect while significantly reducing the thickness of the primary and secondary insulating walls compared to the conventional NO 96 storage tank in which the insulating walls are provided in the form of insulating boxes. I can reap it.

On the other hand, the interior of the transverse connecting body 500 and between the transverse connecting body 500 and the hull (H), a high rigidity insulating box 510 may be disposed to support the transverse connecting body 500. have. The insulation box 510 may be provided in a form of filling a plywood box with a heat insulating material such as perlite powder or glass wool.

Therefore, the liquefied natural gas storage tank according to the present invention, the majority of the insulating walls (300, 100) is composed of insulating panels (310, 110) made of polyurethane foam, but in the corner portion of the storage tank, the insulating box (510) It has a mixed structure.

However, at this time, since the rigidity of the insulation box 510 installed in the corner portion is high, while the rigidity of the insulation panels 310 and 110 is low, a difference occurs in the degree of heat shrinkage between the insulation box 510 and the insulation panels 310 and 110. .

Therefore, when heat is contracted by cryogenic LNG, the insulation box 510 and the insulation panel 310, due to the difference in structural health between the insulation box 510 and the insulation panels 310 and 110, and the heat load and the fluid force of liquefied gas, 110) The height difference caused by heat shrinkage occurs at the boundary between the two, thereby causing thermal stress to occur on the sealing walls 400 and 200 installed on the insulating walls 300 and 100, thereby causing the sealing walls 400 and 200 to be damaged. I have a concern.

Hereinafter, as described above, the metal of the sealing walls 400 and 200 due to the step generated between the insulating box 510 installed in the corner portion of the storage tank and the insulating panels 310 and 110 installed in an area other than the corner portion. The technical configuration for preventing the membrane from being damaged is divided into the first embodiment and the fourth embodiment to look at in detail.

Example 1

Referring to Figure 1, the insulating system of the liquefied natural gas storage tank according to the first embodiment of the present invention, a secondary insulating wall consisting of a plurality of secondary insulating panels 110 arranged on the inner wall of the hull (H) Primary insulation consisting of (100), a secondary sealing wall 200 installed on the secondary insulating wall 100, and a plurality of primary insulating panels 310 arranged on the secondary sealing wall 200 The wall 300, the primary sealing wall 400 installed on the primary insulating wall 300, and the corner portions of the storage tank are installed to support the ends of the primary and secondary sealing walls 400 and 200. It includes a transverse connector 500.

A plurality of insulating boxes 510 for supporting the transverse connection 500 is disposed between the interior of the transverse connection 500 and the inner wall of the transverse connection 500 and the hull H.

Here, among the insulating boxes 510 installed to support the transverse connecting body 500, the insulating boxes 510' and 510 disposed adjacent to the insulating panels 310 and 110 on the side of the transverse connecting body 500. '') is defined as a corner box.

The corner boxes 510' and 510' are the primary corner boxes 510' disposed at the level of the primary insulating wall 300 and the secondary corner boxes 510 disposed at the level of the secondary insulating wall 100. '').

As shown in the figure, the insulation system of the liquefied natural gas storage tank according to the first embodiment of the present invention, the primary insulation panel 310 and the secondary insulation wall (100) constituting the primary insulation wall (300) ) Has a structure in which the secondary insulation panels 110 constituting each other are disposed.

In addition, the primary corner box 510' and the secondary corner box 510'' may also be intersected, and for this purpose, the secondary corner box 510'' is transverse than the primary corner box 510'. It is provided to protrude further out of the connection body 500. That is, the length of the secondary corner box 510'' along the longitudinal direction of the storage tank is made longer than the length of the primary corner box 510', so that the primary corner box 510' and the secondary corner box ( 510'') may be arranged in a stepwise manner.

In the heat insulating system of the liquefied natural gas storage tank according to the first embodiment of the present invention, the primary and secondary corner boxes 510', 510'' are disposed to cross each other, and the primary and secondary thermal insulation panels 310, 110) by being disposed to cross each other, it is possible to effectively prevent the damage to the sealing walls (400, 200) due to the step difference occurring at the boundary between the insulating box 510 and the insulating panels (310, 110).

In this embodiment, the insulation panels 310 and 110 may be provided as sandwich panels in which a density of 130 kg/m ³ or higher fiber-reinforced polyurethane foam insulation is formed between upper and lower plywoods.

In addition, the present embodiment can minimize the step more effectively by configuring the stiffness of the heat insulating layer disposed on the secondary heat insulating wall 100 to be equal to or greater than the rigidity of the heat insulating layer placed on the primary heat insulating wall 300 during cross arrangement. have.

Example 2

Next, referring to FIG. 2, the insulation system of the liquefied natural gas storage tank according to the second embodiment of the present invention includes the configuration of the first embodiment as it is, a primary corner box 510' and a primary insulation panel A gap (a) is formed between 310 to further arrange a primary space insulating member 320 in the gap (a), similarly to a secondary corner box 510'' and a secondary insulation panel 110. A gap (a') may be formed between the second space insulating members (120) in the gap (a').

The primary space insulating member 320 is disposed between the primary corner box 510' and the primary insulating panel 310, and may be provided to have an average amount of heat shrinkage between the two insulating layers 510' and 310.

In addition, the secondary space insulation member 120 is disposed between the secondary corner box 510'' and the secondary insulation panel 110, and is provided to have an average heat shrinkage of the two insulation layers 510''.110. Can be.

That is, in the present embodiment, the primary and secondary spatial insulating members 320 and 120, respectively, the amount of heat shrinkage of the primary and secondary corner boxes 510', 510'' and the primary and secondary thermal insulation panels 310 , 110) having a heat shrinkage amount corresponding to the middle of the heat shrinkage amount, and accordingly, the corner boxes 510', 510'' having the greatest rigidity and the space insulation members 320, 120 having the medium rigidity, and the most Insulating panels 310 and 110 having small rigidity are sequentially arranged.

Therefore, as the structural rigidity of the heat insulating layer at the corner portion of the storage tank is sequentially made, the height of heat insulation according to the difference in the degree of thermal contraction is gradually increased from the corner boxes 510', 510'' to the heat insulation panels 310, 110. Since it is possible, the step difference at the connection between the corner boxes 510', 510'' and the insulation panels 310, 110 is minimized, effectively preventing damage to the primary and secondary sealing walls 400, 200. Can.

On the other hand, the plywood and the polyurethane foam constituting the heat insulating layer use a directional material. The thermal shrinkage coefficients for the material and direction of the insulating layer are as follows.

Material and direction Heat shrink coefficient Plywood in-plane orientation 6 ×10 ^-6 Plywood thickness direction 25 ×10 ^-6 Fiber reinforced polyurethane foam in-plane direction 25 ×10 ^-6 Fiber reinforced polyurethane foam thickness direction 75 ×10 ^-6

Since the insulating box 510 uses a direction in which the plywood has high rigidity as a vertical member, contraction of the thickness direction of the insulating box 510 due to heat load is dominated by heat shrinkage in the in-plane direction of the plywood. Here, the'in-plane direction' refers to a direction perpendicular to the thickness direction of the material, and refers to the direction of the tangent to the plate surface on the flat plate.

On the other hand, the insulating panel (310, 110) provided in the form of a sandwich panel in consideration of strength and thermal insulation performance, the thickness direction (foaming direction) of the fiber-reinforced polyurethane foam, which is a core material, is used as the thickness direction of the insulating layer. 310, 110) in the thickness direction shrinkage of the fiber-reinforced polyurethane foam in the thickness direction is dominant.

Therefore, the space insulation members 320 and 120 installed at the boundary between the corner boxes 510' and 510' and the insulation panels 310 and 110 do not use separate materials, considering the average level of the two. The in-plane direction of the fiber-reinforced polyurethane foam can be used as a system corresponding to the average by placing the thickness direction of the space insulating members 320 and 120 or laminating the thickness direction of the plywood in the thickness direction of the heat insulating layer.

3 shows various examples of the space insulating members 320 and 120 applied to the heat insulating system of the liquefied natural gas storage tank according to the second embodiment of the present invention.

Referring to FIG. 3(a), in this embodiment, the space insulating members 320 and 120 may include heat insulating materials 321 and 121 in which the in-plane direction is formed in the same direction as the thickness direction of the heat insulating layer, that is, in the vertical direction. have. At this time, the heat insulating materials 321 and 121 may be provided with a polyurethane foam or a fiber-reinforced polyurethane foam, and more preferably, a density of 130 kg/m ³ or higher as in the heat insulating materials 311 and 111 of the heat insulating panels 310 and 110 It can be provided with a fiber-reinforced polyurethane foam.

In addition, the space insulation member (320, 120), as shown in Figure 3 (b), the in-plane direction is formed in the vertical direction plywood (322, 122) adhered to the upper and lower surfaces of the heat insulating material (321, 121) It may further include.

At this time, the directionality of the insulating materials 321 and 121 of the space insulating members 320 and 120 (the in-plane direction is formed in the same direction as the thickness direction of the insulating layer), the insulating materials 311 and 111 of the insulating panels 310 and 110 are The direction of excitation (the in-plane direction is formed in a direction perpendicular to the thickness direction of the heat insulating layer) and can be perpendicular to each other.

On the other hand, as shown in Figure 3 (c), the space insulation member 320, 120 according to this embodiment may be made of only the plywood (322, 122). At this time, the plywoods 322 and 122 constituting the space insulating members 320 and 120 may be provided in a form in which a plurality of plywood plywoods in which the thickness direction coincides with the thickness direction of the heat insulating layer, or may be provided integrally. 3(c), the heat shrinkage in the thickness direction of the plywoods 322 and 122 may be applied at a level similar to the heat shrinkage in the in-plane direction of the heat insulating materials 321 and 121.

As described above, in this embodiment, considering the directionality of the materials used in the existing thermal insulation system, the spatial insulation members 320 and 120 can be produced without adding additional materials, and the thermal insulation layers (insulation box and insulation panel) having different shapes can be manufactured. By arranging at the boundary, it is possible to minimize the level difference generated at the corner of the storage tank.

In the thermal insulation system of the liquefied natural gas storage tank according to the second embodiment of the present invention, the gap (a) formed between the primary corner box 510' and the primary thermal insulation panel 310, primary thermal insulation adjacent to each other It may be provided at intervals of 5 to 20 times the size of the gap b formed between the panels 310, and similarly, the gap a formed between the secondary corner box 520' and the secondary insulating panel 110. ), may be provided at intervals of 5 to 20 times the gap (b') formed between the secondary insulation panels 110 adjacent to each other.

In addition, the gap (b) formed between the primary insulating panels 310 adjacent to each other and the gap (b') formed between the secondary insulating panels 110 adjacent to each other include glass wool or polyurethane foam. When the insulation of the material is filled or the space is narrow, the insulation panel connection parts 330 and 130 provided as an empty space may be arranged. The primary insulation member 320 of the present embodiment is adjacent to each other. The thickness direction material stiffness of the insulation panel connecting portion 330 disposed between 310 has a physical property of 1.2 to 4 times, and the secondary space insulation member 120 is between the secondary insulation panels 110 adjacent to each other. The thickness direction material stiffness than the heat insulation panel connecting portion 130 disposed in may be provided to have physical properties of 1.2 to 4 times.

Since the above-described gaps (a, a') may be fluid according to manufacturing tolerances of the hull, the primary and secondary spatial insulation members (320, 120) are located in the fluid space of the corresponding zone (a, a'). By being used together, it is possible to simultaneously serve as a heat insulating material for dimensional alignment.

Third embodiment

Referring to FIG. 4, the insulation system of the liquefied natural gas storage tank according to the third embodiment of the present invention includes the configuration of the first embodiment as it is, but among the plurality of insulation panels 310 and 110, the corner box 510' , 510'') and the stiffness of the insulating panels 310' and 110' disposed adjacent to each other.

In the present embodiment and the fourth embodiment described below, the insulating panels 310' and 110' disposed adjacent to the corner boxes 510' and 510' are defined as border panels, and excluding them. The remaining insulation panels 310 and 110 are defined as general insulation panels.

The insulation system of the liquefied natural gas storage tank according to the third embodiment of the present invention is disposed adjacent to the corner boxes 510', 510'' of the corner portions of the storage tank among the primary and secondary insulation panels 310, 110. The primary and secondary border panels 310 ′ and 110 ′ are made of a high-density polyurethane foam having higher rigidity than the other general insulation panels 310 and 110.

More preferably, the border panels 310 ′ and 110 ′ may be provided as sandwich panels in which a fiber reinforced polyurethane foam insulation having a density of 170 kg/m ³ or higher is formed between upper and lower plywoods. 110) may be provided as a sandwich panel in which a density of 130kg/m ³ or higher fiber-reinforced polyurethane foam insulation is formed between upper and lower plywoods as described above.

According to the present embodiment, the stiffness is gradually reduced as the edges of the corner boxes 510' and 510' are increased to the border panels 310' 110' and the remaining general insulation panels 310 and 110, and accordingly the corner boxes From (510', 510'') to the insulating panels (310, 110), the height of the insulation according to the difference in the degree of thermal contraction can be made gradually, so the corner boxes (510', 510'') and the insulating panels (310, 110) ), the step at the connecting portion is minimized, so that damage to the primary and secondary sealing walls 400 and 200 can be effectively prevented.

Example 4

5, the thermal insulation system of the liquefied natural gas storage tank according to the fourth embodiment of the present invention includes the configuration of the third embodiment as it is, the primary corner box 510' and the primary border panel 310 ') to form a gap (a) between the primary space insulation member 320' is additionally arranged in the gap (a), likewise a secondary corner box 510'' and a secondary border panel 110' ) May be provided with a structure in which a secondary space insulating member 120' is additionally disposed in the gap a'by forming a gap a'therebetween.

That is, the fourth embodiment of the present invention can be said to be configured by combining the features of the second and third embodiments.

The primary space insulating member 320' is disposed between the primary corner box 510' and the primary border panel 310', and is provided to have an average amount of heat shrinkage between the two insulating layers 510' and 310'. Can.

In addition, the secondary space insulation member 120' is disposed between the secondary corner box 510' and the secondary border panel 110', and the average heat shrinkage of the two heat insulating layers 510', 110' is It can be provided to have.

As the primary and secondary spatial insulating members 320' and 120', the structures of the primary and secondary spatial insulating members 320 and 120 shown in FIG. 3 may be employed as they are.

That is, the primary and secondary spatial insulation members 320' and 120' are formed of an insulating material (polyurethane foam or fiber-reinforced polyurethane foam) having the same in-plane direction as the thickness direction of the insulating layer, or on the upper and lower surfaces of the insulating material. The plywood may be provided in an adhesive form, or may be provided in any one of plywood forms in which the thickness direction coincides with the thickness direction of the heat insulating layer.

However, since the primary and secondary spatial insulation members 320' and 120' are provided to have the average heat shrinkage of the corner boxes 510' and 510' and the insulating layers of the border panels 310' and 110', border panel (310 ', 110'), heat insulating material has a density 170kg / m ³ or higher class if made of a fiber-reinforced polyurethane foam, space heat insulation member (320 ', 120') grade insulation also density 170kg / m ³ or more constituting the It can be provided with a fiber-reinforced polyurethane foam.

The insulation system of the liquefied natural gas storage tank according to the fourth embodiment of the present invention, among the plurality of insulation panels (310, 110), the border panel 310', 110' disposed closest to the corner of the storage tank. Spatial insulation having a greater stiffness than other general insulation panels 310 and 110, and having an average heat shrinkage between the corner boxes 510' and 510' and the border panels 310' and 110' By applying all of the structures arranged to the members 320' and 120', among the various embodiments described herein, the corner boxes 510' and 510' in the corner portion of the storage tank and the insulating panels 310 and 110 ), the effect of minimizing the level difference occurring at the connecting portion may be maximized.

The insulation system of the liquefied natural gas storage tank of the present invention described in the first to fourth embodiments of the present invention, as well as the corner portion (90° corner portion) in the width direction of the storage tank, as well as the corner in the longitudinal direction of the storage tank The same can be applied to the portion (135° corner portion).

The present invention is not limited to the described embodiments, and it is obvious to those skilled in the art that various modifications and variations can be made without departing from the spirit and scope of the present invention. Therefore, such modifications or variations will have to be belong to the claims of the present invention.

100: secondary insulation wall 110: secondary insulation panel
110': 2nd border panel 120: 2nd space insulation member
121: insulation 122: plywood
200: secondary sealing wall
300: primary insulating wall 310: primary insulating panel
310': 1st border panel 320: 1st space insulation member
321: insulation 322: plywood
400: primary sealing wall
500: Transverse connector 510: Insulation box
510': 1st corner box 510'': 2nd corner box

Claims (13)

In the liquefied natural gas storage tank including an insulating wall made of a plurality of insulating panels, and a sealing wall installed on the insulating wall to seal the liquefied natural gas,
A transverse connector installed at a corner of the storage tank and supporting the sealing wall to transfer a load applied to the sealing wall to the hull;
An insulating box installed at a corner of the storage tank to support the transverse connection body; And
And a space insulation member inserted into a gap formed between the insulation box and an insulation panel (hereinafter referred to as a'border panel') disposed closest to a corner portion of the storage tank among the insulation panels and the insulation panel,
The plurality of insulating panels are provided with a sandwich panel made of a composite of a heat insulating material and a plywood, and the border panel is made of a polyurethane foam having the same or relatively high density as the other insulating panels,
The space insulation member is provided to have an average amount of heat shrinkage between the insulating box and the border panel,
In the corner portion of the storage tank of the storage tank, characterized in that the structural rigidity of the insulating wall is made sequentially,
Insulation system for liquefied natural gas storage tanks. The method according to claim 1,
The space insulation member, characterized in that it comprises a heat insulating material having a vertical direction and the directionality of the heat insulating material constituting the heat insulating panel,
Insulation system for liquefied natural gas storage tanks. The method according to claim 2,
The heat insulating material constituting the heat insulation panel and the heat insulating material constituting the space insulation member are provided as either polyurethane foam (PUF) or fiber reinforced polyurethane foam (R-PUF),
Insulating material constituting the space insulation member, characterized in that the in-plane direction is formed in a direction perpendicular to the inner wall of the storage tank,
Insulation system for liquefied natural gas storage tanks. The method according to claim 3,
The insulating material constituting the border panel and the space insulation material is provided with a fiber-reinforced polyurethane foam having a density of 170 kg/m ³ or more,
The insulating material constituting the other insulating panels except the border panel is characterized by being provided with a fiber-reinforced polyurethane foam having a density of 130 kg/m ³ or more,
Insulation system for liquefied natural gas storage tanks. The method according to claim 2,
The gap formed between the insulating box and the border panel is characterized in that it is formed at intervals of 5 to 20 times the size of the gap formed between the adjacent insulating panels,
Insulation system for liquefied natural gas storage tanks. The method according to claim 5,
Further comprising a heat-insulating panel connection provided in a form or empty space filled with glass wool or polyurethane foam insulation in the gap formed between the heat-insulating panels adjacent to each other,
The space insulation member is characterized in that it has a material stiffness in the thickness direction of 1.2 to 4 times the connection of the insulation panel,
Insulation system for liquefied natural gas storage tanks. A secondary insulating wall made of a plurality of secondary insulating panels arranged on the inner wall of the hull, a secondary sealing wall installed on the secondary insulating wall, and a plurality of primary insulating panels arranged on the secondary sealing wall In the liquefied natural gas storage tank comprising a primary insulating wall made, and a primary sealing wall installed on the primary insulating wall,
A transverse connector installed at a corner of the storage tank to support the primary sealing wall and the secondary sealing wall to transfer loads applied to the primary sealing wall and the secondary sealing wall to a hull; And
Including an insulating box for supporting the transverse connection,
The insulation box includes a primary corner box disposed adjacent to the primary insulation panel at the level of the primary insulation wall, and a secondary corner disposed adjacent to the secondary insulation panel at the level of the secondary insulation wall. Includes a box,
The secondary corner box protrudes more outwardly of the transverse connector than the primary corner box so that the primary insulation panel and the secondary insulation panel cross each other, so that the primary corner box and the secondary Characterized in that the corner box is arranged in a staircase,
Insulation system for liquefied natural gas storage tanks. The method according to claim 7,
The primary insulating panel and the secondary insulating panel are provided with a sandwich panel made of a composite of a heat insulating material and a plywood made of polyurethane foam,
The primary sealing wall and the secondary sealing wall is characterized in that consisting of a metal membrane,
Insulation system for liquefied natural gas storage tanks. The method according to claim 8,
A primary space insulation member disposed in a gap (a) formed between the primary corner box and the primary insulation panel, and having an average heat shrinkage of the primary corner box and the primary insulation panel disposed on both sides. ; And
It is arranged in the gap (a') formed between the secondary insulation panel and the secondary corner box, and secondary spatial insulation having an average amount of heat shrinkage between the secondary corner box and the secondary insulation panel disposed on both sides. Characterized in that it further comprises a member,
Insulation system for liquefied natural gas storage tanks. The method according to claim 9,
The primary space insulation member and the secondary space insulation member, characterized in that it comprises a polyurethane foam insulation having a direction perpendicular to the polyurethane foam insulation of the adjacent primary and secondary insulation panels, respectively, characterized in that,
Insulation system for liquefied natural gas storage tanks. The method according to claim 10,
The primary space insulation member and the polyurethane foam insulation included in the secondary space insulation member, characterized in that the in-plane direction is formed in a direction perpendicular to the inner wall of the storage tank,
Insulation system for liquefied natural gas storage tanks. The method according to claim 9,
The primary space insulating member and the secondary space insulating member, characterized in that at least one plywood whose thickness direction coincides with the thickness direction of the heat insulating layer,
Insulation system for liquefied natural gas storage tanks. The method according to claim 12,
The primary space insulating member and the secondary space insulating member, characterized in that a plurality of plywood plywood whose thickness direction coincides with the thickness direction of the heat insulating layer is provided in a stacked form,
Insulation system for liquefied natural gas storage tanks.

Images