KR102020969B1 - Insulation System For Liquefied Natural Gas Storage Tank - Google Patents

Abstract

Disclosed is an insulation system for a liquefied natural gas storage tank. According to the present invention, the insulation system for a liquefied natural gas storage tank includes: a first sealing wall directly coming into contact with liquefied natural gas of an extremely low temperature; a first insulation layer installed on the outside of the first sealing wall; a second sealing wall installed on the outside of the first insulation layer; a second insulation layer installed on the outside of the second sealing wall and fixed to an inner wall of a hull; and an invar tube installed at each corner of a liquefied natural gas storage tank, wherein the first sealing wall and the second sealing wall are fixed to the invar tube. The first insulation layer includes: a first connection box installed to be in contact with the invar tube; and multiple first insulation panels installed in a space of the first insulation layer except for the first connection box. The second insulation layer includes: a second connection box installed to be in contact with the invar tube; and multiple second insulation panels installed in the space of the second insulation layer except for the second connection box. The first connection box is installed in a form in which a cross section facing the first insulation panel is stepped or in a form in which the cross section is diagonally inclined.

Description

Insulation System For Liquefied Natural Gas Storage Tank

The present invention relates to a thermal insulation system of a liquefied natural gas storage tank, and more specifically, the corner portion of the storage tank is applied to the box type insulation structure, the area except the corner portion is a panel type insulation (panel type) The present invention relates to an insulation system of a liquefied natural gas storage tank using a structure.

Natural gas is transported in gaseous form through onshore or offshore gas pipelines, or liquefied natural gas (LNG), stored in LNG carriers to remote consumers. It is obtained by cooling to -163 ℃), and its volume is reduced to about 1/600 than that of gaseous natural gas, which is very suitable for long distance transportation by sea.

Storage tanks that can withstand the cryogenic temperatures of liquefied natural gas (such as LNG carriers) are used in structures for transporting or storing liquefied natural gas, such as LNG carriers for loading LNG into the sea by loading LNG. Is installed.

These storage tanks can be classified into independent tank type and membrane type depending on whether the load of cargo is directly applied to the insulation. Membrane type storage tanks are generally divided into GTT NO 96 type and Mark III type, and independent tank type storage tanks are divided into MOSS type and IHI-SPB type.

The structure of the membrane type storage tank is described in US Patent Nos. 6,035,795, 6,378,722, 5,586,513, US Patent Publication No. 2003-0000949 and the like, and Korean Patent Publication Nos. 10-2000-0011347 and 10-2000-0011346 It is described. In addition, the structure of the independent tank type storage tank is described in Korean Patent Nos. 10-15063 and 10-305513.

Mark III type storage tank is a panel type insulation system using polyurethane foam.

As shown in Fig. 1, the Mark III type storage tank has a primary seal wall 10 made of a stainless steel (SUS) membrane of approximately 1.2 mm thickness and a secondary seal made of a rigid triplex. The wall 20, the primary insulation panel 30, and the secondary insulation panel 40 are alternately stacked on the inner surface of the hull.

The primary insulation panel 30 is a wooden plywood bonded to the upper surface of the insulation made of high density polyurethane foam (PUF), the secondary insulation panel 40 is a wooden plywood on the lower surface of the high density polyurethane foam insulation. It is glued. The secondary insulation panel 40 is installed on the hull inner wall by stud bolts or the like.

In case of the Mark III type storage tank, the secondary insulation panel 40, the secondary sealing wall 20 and the primary insulation panel 30 are modularly used to form one unit panel. After arranging on the inner surface, the barrier structure is completed by laminating the primary sealing wall 10 on top.

The primary sealing wall 10 is fixed by welding to an anchor strip (not shown) installed on the upper portion of the primary insulating panel 30, the primary sealing wall 10 for absorbing shrinkage due to low temperature Corrugation of the wave is formed.

Mark III type storage tank is relatively easy to install because the secondary sealing wall 20 and the primary and secondary insulation panels 30 and 40 can be manufactured by mounting them integrally on land. However, the welding work of the primary sealing wall 10 provided as a corrugated corrugated barrier is complicated, and there is a low automation rate and disadvantages in terms of installation / manufacturing.

The NO 96 type storage tank is a box type insulation system using an insulated box.

As shown in FIG. 2, the NO 96 storage tank includes a primary sealing wall 50 and a secondary sealing wall 60 made of Invar steel (36% Ni) having a thickness of 0.5 to 0.7 mm, The primary insulation wall 70 and the secondary insulation wall 80 formed by arranging insulation boxes made by filling the plywood powder with perlite powder are alternately installed on the inner surface of the hull.

The primary sealing wall 50 and the secondary sealing wall 60 use a membrane sheet made of Invar. The primary and secondary insulation walls 70 and 80 are made of a form filled with pearlite powder inside a box made of wood, and each insulation box is connected to a coupler.

The NO 96 type storage tank has the same degree of liquid tightness and strength as that of the primary sealing wall 50 and the secondary sealing wall 60, so that when the primary sealing wall 50 leaks, the secondary sealing wall 60 ) Can be kept confidential for a long time.

In the case of the NO 96 type storage tank, the sealing walls 50 and 60 consist of a flat invar membrane having a flat shape without corrugated wrinkles. 70, 80) should be composed of a thermally insulated box with less heat shrinkage deformation.

In addition, the NO 96 type storage tank is provided with an inva tube 90 for firmly fixing the membrane sheet at the corner of the storage tank in order to apply the sealing walls 50 and 60 to the flat inva membrane.

Invar tube 90 may be composed of a plurality of connecting sheets (91, 92, 93, 94) formed in a horizontal direction and a vertical direction. One end of the plurality of connection sheets 91, 92, 93, 94 is fixed to the inner wall of the hull and the other end of the primary sealing wall 50 or the secondary sealing wall 60 is fixed by welding or the like.

By the plurality of connection sheets 91, 92, 93, 94, four spaces having a hexahedron shape are partitioned in the invar tube 90, and an insulation box is disposed in the space. The insulation box disposed in this space may be provided in a form filled with pearlite powder inside a box made of wood, similar to the insulation box forming the primary and secondary insulation walls 70 and 80. This is to prevent the deformation of the shape of the Invar tube 90 by using a high rigidity insulation box.

As described above, in the NO 96 storage tank, since the sealing walls 50 and 60 have a flat shape without corrugated wrinkles, the barrier welding is simpler than the Mark III type, and the barrier welding is relatively easy to automate.

However, the NO 96 type storage tank should be applied with a thermally insulated box with low heat shrinkage deformation and high rigidity in order to apply a flat metal membrane without wrinkles.The box type NO 96 storage tank has a panel type Mark III type storage tank. Thermal performance is worse than that of the tank, and there is a problem that buckling occurs according to the insulation height.

The present invention applies a flat metal membrane of the NO 96 type storage tank to the panel type insulation structure of the Mark III type storage tank, and has excellent thermal performance and easy automation of welding. It is a technical problem to provide a thermal insulation system of a natural gas storage tank.

In order to apply a flat metal membrane to a panel type insulating structure, it is necessary to effectively support the generation of the load due to the thermal contraction of the membrane and to solve the problems caused by buckling.

In order to achieve the above object, the present invention is the primary insulation panel 131p for primarily insulating the liquefied natural gas, and is disposed outside the primary insulation panel 131p to secondary the liquefied natural gas A panel part including a second insulating panel to insulate; A corner part provided at a corner of the liquefied natural gas storage tank, the corner part including an invar tube 190 provided in a lattice form and having an insulation box 191 disposed therein; And a secondary connection box 131b disposed between the primary insulation panel 131p and the inva tube 190, and a secondary disposed between the secondary insulation panel 141p and the inva tube 190. A connection part including a connection box 141b; wherein at least one or more of the primary connection box 131b and the secondary connection box 141b have a stepped shape in cross section in contact with an insulation panel; Provided is an insulated system of a liquefied natural gas storage tank, characterized in that provided in an oblique form inclined.

The present invention is installed on the upper portion of the primary insulation panel (131p) the primary sealing wall 110 in direct contact with the liquefied natural gas of cryogenic temperature; And a secondary sealing wall 120 installed between the primary insulating panel 131p and the secondary insulating panel 141p. The secondary sealing wall 110 and the secondary sealing wall ( 120 is made of a metal membrane of the flat form without wrinkles, characterized in that one end and the other end is fixed to the invar tube.

The first sealing wall 110 and the second sealing wall 120 may be made of stainless steel (SUS) or Invar material.

The primary connection box 131b and the secondary connection box 141b are provided in a form filled with pearlite powder in a wooden box, and the primary insulation panel 131p and the secondary insulation panel 141p have high density. It may be formed of polyurethane foam.

Both ends of the primary insulation panel 131p and the secondary insulation panel 141p are provided in stepped form in stepped manner, and the primary connection box 131b and the primary insulation panel 131p are connected to each other. A primary bridge pad 132 disposed to seal an area and an empty space at an upper portion of an area to which the pair of primary insulating panels 131p adjacent to each other are connected; And an empty space at an upper portion of an area where the secondary connection box 141b and the secondary insulation panel 141p are connected and an area where the pair of secondary insulation panels 141p adjacent to each other are connected to each other. The secondary bridge pad 142 is disposed; may further include.

The primary bridge pad 132 and the secondary bridge pad 142 may be formed of polyurethane foam.

Between the primary connection box 131b and the primary insulation panel 131p facing the primary connection box 131b, between a pair of primary insulation panels 131p adjacent to each other, A gap is formed between the secondary connection box 141b and the secondary insulation panel 141p facing the secondary connection box 141b and between the pair of secondary insulation panels 141p adjacent to each other. ) Is formed, and a slit may be formed at the lower portion of the primary insulation panel 131p or at the upper portion of the secondary insulation panel 141p at a position corresponding to the gap.

The present invention further includes a plurality of fixing devices (s) for fixing the primary heat insulating layer 130 and the secondary heat insulating layer 140 to each other, the fixing device (s) of the secondary heat insulating panel (141p) It may be installed at an intermediate point between adjacent slits of the plurality of slits formed on the upper side.

In addition, the present invention, the primary sealing wall 110 in direct contact with the cryogenic liquefied natural gas in order to achieve the above object; A primary heat insulation layer 130 disposed outside the primary sealing wall 110; A second sealing wall 120 disposed outside the first heat insulating layer 130; And a secondary heat insulating layer 140 disposed outside the secondary sealing wall 120 and fixed to the inner wall of the hull, wherein the primary sealing wall 110 and the heat insulating system of the liquefied natural gas storage tank are included. One end and the other end of the second sealing wall 120 is fixed to the Invar tube 190 provided at each corner of the LNG storage tank, and the first heat insulating layer 130 and the second heat insulating layer 140 are The connection boxes 131b and 141b filled with the heat insulating material in the wooden box and the insulation panels 131p and 141p formed of polyurethane foam are provided in a combined form, and the invar tube 190 and the insulation panels 131p and 141p are provided. The connection boxes 131b and 141b disposed between the first and second sealing walls 110 and 2 may be provided in a stepped form or in an oblique form inclined in a cross section facing the insulation panels 131p and 141p. Characteristic of suppressing the occurrence of buckling during the heat shrink of the car sealing wall 120, Provides an insulation system for liquefied natural gas storage tanks.

Insulating system of liquefied natural gas storage tank according to the present invention, by applying a metal membrane of the flat form of the NO 96 storage tank to the panel type insulation structure of the Mark III storage tank, it has excellent thermal performance and at the same time the automation rate of welding By increasing it has an advantageous advantage in terms of installation / fabrication.

This is possible by providing a stepped or diagonally inclined shape of a connection part disposed between a corner part provided in a box type and a panel part provided in a panel type.

In particular, when one end of the connection box provided in the connecting portion is inclined diagonally, it is possible to easily solve the step problem resulting from the difference in the degree of heat shrinkage of the corner portion provided in the box type and the panel portion provided in the panel type. . The sealing wall made of the membrane naturally bends along the inclined surface of the connection box, thereby minimizing the load on the membrane sheet and uniformly distributing the load of the cargo, thereby stably supporting it.

In addition, according to the present invention, by forming a plurality of slits on the lower side or the upper side of the heat insulating panel, a uniform cross section of the heat insulating panel can be formed, and thus stress concentration phenomenon can be effectively prevented in the behavior due to heat shrinkage.

1 is a view schematically showing a conventional Mark III type storage tank.
2 is a view schematically showing a conventional NO 96 storage tank.
3 is a view schematically showing an insulation system of a liquefied natural gas storage tank according to a first embodiment of the present invention.
4 is a view schematically showing an insulation system of a liquefied natural gas storage tank according to a second embodiment of the present invention.
5 is a view showing a thermal stress analysis results by modeling the thermal insulation system of the liquefied natural gas storage tank according to the first embodiment of the present invention.
6 is a view showing a thermal stress analysis results by modeling the thermal insulation system of the liquefied natural gas storage tank according to a second 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 which illustrate preferred embodiments of the present invention and the contents described in the accompanying drawings.

Hereinafter, exemplary embodiments of the present invention will be described in detail with reference to the accompanying drawings. Like reference numerals in the drawings denote like elements.

In the present invention, the use of the terms 'primary' and 'secondary' is a function of primarily sealing or insulating the liquefied natural gas based on the liquefied natural gas stored in the storage tank. It is used as a sorting criterion for functioning.

3 is a view schematically showing an insulation system of a liquefied natural gas storage tank according to a first embodiment of the present invention.

Referring to FIG. 3, a heat insulation system of a liquefied natural gas storage tank according to a first embodiment includes a primary sealing wall 110 and a primary sealing wall that directly contact the cryogenic liquefied natural gas inside the storage tank. The primary heat insulation layer 130 disposed on the outside of the 110, the secondary sealing wall 120 disposed on the outside of the primary heat insulation layer 130, and the outer side of the secondary sealing wall 120 are disposed on the inner wall of the hull. Secondary heat insulating layer 140 is fixed.

That is, the heat insulation system of the LNG storage tank according to the present embodiment, the secondary heat insulating layer 140, the secondary sealing wall 120, the primary heat insulating layer 130, the primary sealing wall ( 110 is sequentially stacked.

In addition, the insulator system of the liquefied natural gas storage tank according to the first embodiment is provided in each corner of the storage tank, the Inba tube is fixed to one end and the other end of the primary sealing wall 110 and secondary sealing wall 120 190 further includes.

Like the NO 96 storage tank, the Invar tube 190 may be composed of a plurality of connecting sheets formed in a horizontal direction and a vertical direction. It may be provided to have a form. One end of each connecting sheet is fixed to the inner wall of the hull, and the other end of the primary sealing wall 110 or the secondary sealing wall 120 is fixed by welding.

In the invar tube 190 having a lattice cross section, four spaces having a hexahedron shape are partitioned, and an insulation box 191 is disposed in the space. The heat insulation box 191 disposed in the space may be provided in a form filled with pearlite powder inside the box made of wood. This is to prevent the deformation of the shape of the Invar tube 190 by using a high rigidity insulation box.

The primary sealing wall 110 may be made of a metal membrane made of stainless steel (SUS) or Invar, and is fixedly installed by an anchor strip (not shown) provided on the primary insulating layer 130.

The secondary sealing wall 120 may also be formed of a metal membrane made of stainless steel or Invar, and is installed on the secondary insulating layer 140.

The primary heat insulation layer 130 is a plurality of primary arranged in the space of the primary connection box 131b disposed to contact the Invar tube 190 and the primary insulation layer 130 except for the primary connection box 131b. It is comprised including the heat insulation panel 131p.

The primary connection box 131b may be provided in a form filled with pearlite powder in a box made of wood to have rigidity. The primary insulation panel 131p may be composed of a heat insulating material formed of a high density polyurethane foam and a plywood plywood bonded to an upper surface of the polyurethane foam heat insulating material.

Secondary insulation layer 140 is a secondary connection box 141b disposed in contact with the Invar tube 190 and a plurality of secondary disposed in the space of the secondary insulation layer 140, except the secondary connection box 141b. It is comprised including the heat insulation panel 141p.

The secondary connection box 141b may be provided in a form filled with pearlite powder in a box made of wood to have rigidity. Secondary insulation panel 141p may be composed of a heat insulating material formed of a high density polyurethane foam, and a plywood plywood bonded to the upper surface of the polyurethane foam insulation.

The primary connection box 131b and the secondary connection box 141b may be provided in a stepped form so that cross sections facing the primary insulation panel 131p and the secondary insulation panel 141p are stepped, respectively.

In addition, the primary insulation panel 131p and the secondary insulation panel 141p may be provided in a stepped form so that both ends thereof are stepped, respectively, and the primary insulation panel 131p and the secondary insulation panel 141p are liquefied natural gas. The ends may be arranged to be shifted from each other in order to effectively prevent the leakage.

The primary connection box 131b and the primary insulation panel 131p or a pair of primary insulation panels 131p adjacent to each other may be connected by primary bridge pads 132.

The primary bridge pad 132 is disposed to share the upper surface of the protruding ends of the primary connection box 131b and the primary insulation panel 131p or a pair of primary insulation panels 131p adjacent to each other. Seal and perform primary insulation.

The secondary connection box 141b and the secondary insulation panel 141p or a pair of secondary insulation panels 141p adjacent to each other may also be connected by the secondary bridge pad 142 in the same manner as described above. The secondary bridge pad 142 seals a space between the secondary connection box 141b and the secondary insulation panel 141p or a pair of secondary insulation panels 141p adjacent to each other and performs a secondary insulation function. do.

The primary bridge pad 132 and the secondary bridge pad 142 may be formed of polyurethane foam similarly to the insulation panels 131p and 141p.

A gap may be formed between the components 131b, 131p, and 132 constituting the primary insulation layer facing each other. This is to prevent the concentration of stress caused by thermal contraction or thermal expansion of each of the components (131b, 131p, 132). The same applies to the secondary heat insulation layer 140. The gap may be filled with glass wool to block heat transfer due to convection.

Insulating system of the liquefied natural gas storage tank according to the present embodiment can be said to be largely divided into a corner part (corner part) and a panel part (panel part), and a connection part (connection part) connecting the corner part and the panel part.

Here, the corner portion refers to the inba tube 190 and the insulation box 191 disposed therein, and the panel portion is formed of a polyurethane foam as a whole, the primary insulation panel 131p, the primary bridge pad 132, and the secondary The insulation panel 141p and the secondary bridge pad 142 may be referred to, and the connection portion may mean a primary connection box 131b and a secondary connection box 141b disposed between the corner portion and the panel portion.

This embodiment reminds again that the technical problem of applying a flat metal membrane to a panel type insulating structure.

To this end, similar to the NO 69 type storage tank, the heat shrinkage of the membrane by firmly fixing the primary sealing wall 110 and the secondary sealing wall 120 by an Invar tube 190 provided at the corner of the storage tank. It may have a structural strength that can effectively support the load generation due to.

In addition, as shown in Figure 3, by having a stepped shape as a whole by the stepped portion of the primary connection box 131b and the secondary connection box 141b, it is possible to suppress the occurrence of buckling.

According to the configuration as described above, in the present embodiment, in the liquefied natural gas storage tank, the corner portion takes the form of a NO 96 storage tank, and the middle portion except the corner portion takes the form of a Mark III storage tank, but the primary sealing wall 110 may be provided as a metal membrane of a flat shape without wrinkles. That is, the flat type metal membrane can be arranged in a panel type insulation system without wrinkles.

On the other hand, the primary insulation panel 131p and the secondary insulation panel 141p which face each other with the secondary sealing wall 120 therebetween may be thermally contracted in different directions. In this case, the secondary sealing wall 120 may cause damage in the airtight state due to breakage due to stress concentration due to the opposite stress acting on the upper side and the lower side.

In this embodiment, in order to prevent this, a plurality of lower slits 133 may be formed at regular intervals below the primary insulation panel 131p.

Here, the lower slit 133 may have a meaning including a gap formed between the primary insulation panel 131p, and specifically, the secondary connection box 141b and the secondary insulation panel (in the secondary insulation layer 140). 141p, and gaps formed between the secondary bridge pad 142 and the secondary insulating panel 141p, and the corresponding positions are formed at the same interval.

In addition, the upper slit 143 may be formed on the upper side of the secondary insulation panel 141p.

The upper slit 143 is a gap formed between the secondary connection box 141b and the secondary insulation panel 141p, and a gap formed between the secondary bridge pad 142 and the secondary insulation panel 141p. It may be included, and are formed at the same intervals as the lower slit 133 described above.

When the lower slit 133 or the upper slit 143 is formed at a position corresponding to the boundary formed between the unit insulation box or the unit insulation panel as described above, the upper side (primary) at a specific point of the secondary sealing wall 120 The direction of the stress acting on the insulation layer side) and the lower side (secondary insulation layer side) can be made in the same direction, so that the stress concentration phenomenon does not occur in the behavior due to the heat shrinkage of the insulation panel, thereby liquefied natural gas storage tank The thermal performance and structural stability of the insulation system can be improved.

In addition, the present embodiment may include a plurality of securing devices (s) for fixing the secondary thermal insulation layer 140 and the primary thermal insulation layer 130 to each other, wherein the fixing device (s) is an adjacent slit. It may be installed at an intermediate point between 133 or 143.

According to this, since the fixing device s receives the same stress from the left and right directions, it is hardly affected by the heat shrinkage behavior of the heat insulating panel, and thus the second heat insulating layer 140 and the first heat insulating layer 130 are stably fixed. You can.

4 is a view schematically showing an insulation system of a liquefied natural gas storage tank according to a second embodiment of the present invention, Figure 5 is a model for the insulation system of a liquefied natural gas storage tank according to a first embodiment of the present invention FIG. 6 is a diagram illustrating a thermal stress analysis result by modeling an insulation system of a liquefied natural gas storage tank according to a second embodiment of the present invention.

4, the overall configuration of the heat insulation system of the liquefied natural gas storage tank according to the second embodiment is almost the same as in the first embodiment.

However, in the first embodiment, one end of the primary connection box 131b is formed to be stepped, whereas in the second embodiment, one end of the primary connection box 131b is inclined diagonally.

Although the occurrence of buckling is somewhat suppressed as the shape of the connecting portion including the first connection box 131b and the second connection box 141b is cascaded in the first embodiment, the primary connection is provided with a box made of wood. The difference between the rigidity and the degree of heat shrinkage between the box 131b and the primary insulation panel 131p formed of a panel formed of polyurethane foam is still a problem of step difference.

Looking at the results of thermal stress analysis by the modeling of the thermal insulation system of the liquefied natural gas storage tank according to the first embodiment shown in Figure 5, the primary connection box (131b) and the primary insulation panel (131p) at the portion indicated by A It can be seen that there is a step between the liver, which may cause a dip in the primary sealing wall 110 made of a membrane or damage the membrane of the storage tank by damaging the membrane sheet.

In the insulation system of the liquefied natural gas storage tank according to the second embodiment, in order to prevent this, the primary connection box 131b is provided in a form inclined diagonally.

Looking at the results of the thermal stress analysis by the modeling of the thermal insulation system of the liquefied natural gas storage tank according to the second embodiment shown in Figure 6, one end of the primary connection box 131b has a form inclined to form a membrane It can be seen that the first sealing wall 110 is bent smoothly without being stamped.

As described above, the thermal insulation system of the liquefied natural gas storage tank according to the second embodiment is induced by naturally bending along the inclined surface of the primary connection box 131b to the primary sealing wall 110 formed of the membrane. The load on the seat can be minimized and the load of the cargo can be evenly distributed to support it stably.

In this embodiment, as one end of the primary connection box 131b is provided to be inclined in an oblique shape, the ends of the primary insulation panel 131p and the primary bridge pad 132 facing each other are also inclined to correspond thereto. Can be prepared.

In addition, although only one end of the primary connection box 131b is provided in an oblique form in FIG. 5, one end of the secondary connection box 141b provided in the secondary insulation layer 140 may also be inclined in an oblique form. Of course it can.

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

110: primary sealing wall 120: secondary sealing wall
130: primary insulation layer 131b: primary connection box
131p: Primary insulation panel 132: Primary bridge pad
133: lower slit
140: secondary insulation layer 141b: secondary connection box
141p: secondary insulation panel 142: secondary bridge pad
143: upper slit
190: Invar tube 191: insulation box

Claims (9)

In the insulation system of liquefied natural gas storage tank,
It includes a primary heat insulating panel (131p) for primarily insulating the liquefied natural gas, and a secondary heat insulation panel (141p) disposed outside the primary heat insulating panel (131p) to insulate the liquefied natural gas secondary Panel part;
A corner part provided at a corner of the liquefied natural gas storage tank, the corner part including an invar tube 190 provided in a lattice form and having an insulation box 191 disposed therein; And
A primary connection box 131b disposed between the primary insulation panel 131p and the invar tube 190, and a secondary connection disposed between the secondary insulation panel 141p and the invar tube 190. A connection part including a box 141b;
At least one or more of the primary connection box (131b) and the secondary connection box (141b) is characterized in that the cross section in contact with the insulation panel is provided in a stepped form or inclined in an oblique form,
Insulation system of LNG storage tank. The method according to claim 1,
A primary sealing wall 110 installed on an upper portion of the primary insulation panel 131p and in direct contact with the liquefied natural gas of cryogenic temperature; And
And a second sealing wall 120 installed between the primary insulation panel 131p and the secondary insulation panel 141p.
The first sealing wall 110 and the second sealing wall 120 is formed of a flat metal membrane having no wrinkles, characterized in that one end and the other end is fixed to the invar tube,
Insulation system of LNG storage tank. The method according to claim 2,
The first sealing wall 110 and the second sealing wall 120, characterized in that made of stainless steel (SUS) or Invar (Invar) material,
Insulation system of LNG storage tank. The method according to claim 2,
The primary connection box 131b and the secondary connection box 141b are provided in a form filled with pearlite powder in a wooden box, and the primary insulation panel 131p and the secondary insulation panel 141p have high density. Characterized in that formed of polyurethane foam,
Insulation system of LNG storage tank. The method according to claim 4,
Both ends of the primary insulation panel 131p and the secondary insulation panel 141p are provided in a stepped manner in a stepped manner.
The first connection box 131b and the primary insulation panel 131p are connected to each other, and a pair of adjacent space between the primary insulation panel 131p adjacent to each other is arranged to close the empty space A primary bridgepad 132; And
Arranged to seal the empty space in the upper portion of the region where the secondary connection box 141b and the secondary insulation panel 141p are connected, and the region where the pair of secondary insulation panels 141p adjacent to each other are connected. Being secondary bridge pad 142; characterized in that it further comprises,
Insulation system of LNG storage tank. The method according to claim 5,
The first bridge pad 132 and the second bridge pad 142 is characterized in that formed of polyurethane foam,
Insulation system of LNG storage tank. The method according to claim 6,
Between the primary connection box 131b and the primary insulation panel 131p facing the primary connection box 131b, between a pair of primary insulation panels 131p adjacent to each other, A gap is formed between the secondary connection box 141b and the secondary insulation panel 141p facing the secondary connection box 141b and between the pair of secondary insulation panels 141p adjacent to each other. ) Is formed,
Slit is formed on the lower portion of the primary insulation panel 131p or the upper portion of the secondary insulation panel 141p at a position corresponding to the gap,
Insulation system of LNG storage tank. The method according to claim 7,
Further comprising a plurality of fixing device (s) for fixing the primary heat insulating layer 130 and the secondary heat insulating layer 140,
The fixing device (s) is characterized in that it is installed at an intermediate point between the adjacent slits of the plurality of slits formed on the upper portion of the secondary insulation panel (141p),
Insulation system of LNG storage tank. Primary sealing wall 110 in direct contact with the cryogenic liquefied natural gas; A primary heat insulation layer 130 disposed outside the primary sealing wall 110; A second sealing wall 120 disposed outside the first heat insulating layer 130; In the insulation system of the liquefied natural gas storage tank comprising; and a secondary heat insulation layer 140 is disposed outside the secondary sealing wall 120 is fixed to the inner wall of the hull,
One end and the other end of the primary sealing wall 110 and the secondary sealing wall 120 are fixed to an invar tube 190 provided at each corner of the liquefied natural gas storage tank.
The primary thermal insulation layer 130 and the secondary thermal insulation layer 140 is provided in a form in which the connection boxes (131b, 141b) filled with a heat insulating material in a wooden box and the insulation panels (131p, 141p) formed of polyurethane foam are combined. ,
The connection boxes 131b and 141b disposed between the invar tube 190 and the heat insulation panels 131p and 141p have a stepped shape or a diagonal cross section facing the heat insulation panels 131p and 141p. It is provided in the form of a photo, characterized in that to suppress the occurrence of buckling during the heat shrink of the primary sealing wall 110 and the secondary sealing wall 120,
Insulation system of LNG storage tank.

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