KR101168949B1 - Heat insulation structure and cryogenic liquid storage tank having the same - Google Patents

Abstract

Insulating structure of the cryogenic liquid storage tank according to the present invention, in order to cover the inner wall of the tank, a plurality of insulation panels disposed in the longitudinal direction intersecting the transverse direction and the transverse direction, a plurality of insulation panels facing each other in the horizontal direction A first strip disposed on these two insulation panels to cover a horizontal gap between the two insulation panels arranged to be viewed, a longitudinal direction between two insulation panels arranged to face each other in a longitudinal direction intersecting the transverse direction among a plurality of insulation panels A second strip is disposed over these two insulating panels to cover the gap and a portion of which overlaps the first strip. The first strip has an extension extending over the transverse gap to suppress deformation of the first and second strips due to the loads applied to the first and second strips. According to the present invention, since the first strip for covering the gap between the two insulating panels has an extension extending over the gap between the two insulating panels, bending deformation due to the load applied to the strip during the construction of the strip can be effectively prevented. .

Description

Heat-insulating structure and cryogenic liquid storage tank having the same {HEAT INSULATION STRUCTURE AND CRYOGENIC LIQUID STORAGE TANK HAVING THE SAME}

The present invention relates to a cryogenic liquid storage tank, and more particularly, an insulating structure and a cryogenic liquid storage tank having the same, which can improve deformation and stability of the barrier by suppressing deformation of the strip constituting the barrier for sealing the cryogenic liquid. It is about.

Cryogenic liquids, such as LNG, liquid argon (LAR), liquid nitrogen (LIN), liquid oxygen (LOX), and liquid hydrogen (LH ₂ ), are insulated storage tanks to minimize liquid loss due to evaporation. Stored or transported in storage.

As an example of such a cryogenic liquid storage tank, the storage tank for liquefied natural gas is for storing the cryogenic liquefied natural gas of about -165 ℃, there are spherical type (Spherical Type) and membrane type (Membrane Type). Membrane type liquefied natural gas storage tank is the most widely used because of its larger loading capacity and simpler manufacturing than the spherical type liquefied natural gas storage tank. As the membrane type liquefied natural gas storage tank, MARK-III type and NO-96 type are known. The storage tank for liquefied natural gas has a structure in which an insulating structure for preventing leakage of liquefied natural gas and insulating the storage space in which the liquefied natural gas is stored is coupled to the inner wall of the tank.

The NO-96 type LNG storage tank uses Invar steel (36% nickel steel) with very low thermal expansion as the primary and secondary barriers, and an insulated box filled with pearlite is arranged between the barriers. . In contrast, the MARK-III type liquefied natural gas storage tank stacks a sandwich structure made of polyurethane foam and plywood in multiple layers, and combines the primary and secondary barriers to store the liquefied natural gas. Seal the storage space and insulate at the same time. As a primary barrier, a stainless steel sheet provided with lattice-like pleats is used to absorb expansion and contraction due to thermal deformation, and a barrier sheet and strip made of metal or composite material is used as a secondary barrier. The barrier sheet covers the top surface of the insulation panel, and the strip covers the gap between two adjacent insulation panels.

These two types of LNG storage tanks are known to have similar gas-off rates (BOR), but stainless steel and triplex are inexpensive, easy to install, and insulated from polyurethane foam, compared to Invar membranes. Due to its excellent effect, liquefied natural gas storage tanks of the MARK-III type are preferred.

The strip constituting the secondary barrier of the conventional LNG storage tank is bonded to the insulation panel by the adhesive, and in the process of bonding the strip must be applied a constant pressure and temperature to cure the adhesive. For effective sealing, the strip and the strip must be constructed in an overlapping structure, and in order to ensure the reliability of the overlapping structure, the deformation of the strip generated in the curing process of the adhesive must be suppressed. However, in the conventional strip bonding method, the deformation of the strip occurs due to the high pressure and the temperature of the adhesive curing process, so that the bonding quality of the strip overlapping structure may be uneven and the bonding reliability may be deteriorated.

The present invention is to solve this problem, by reducing the deformation of the strip generated in the curing process in order to improve the bonding reliability of the strip overlap structure and by reducing the thermal stress generated in the strip bonded structure in cryogenic environment Insulating structure and cryogenic liquid storage tank having same for improving stability and reliability

Insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention for achieving the above object, a plurality of outer insulation panels disposed along the longitudinal direction crossing the transverse direction and the transverse direction on the tank inner wall to cover the tank inner wall A first strip disposed on the two outer insulating panels to cover a horizontal gap between the two outer insulating panels disposed to face each other in the horizontal direction among the plurality of outer insulating panels, the plurality of outer insulating panels intersecting with the horizontal direction; A second strip disposed over these two outer insulating panels to cover a longitudinal gap between the two outer insulating panels arranged to face each other in the longitudinal direction, the second strip overlying the first strip, a plurality of outer insulating panels to cover the plurality of outer insulating panels A plurality of inner insulation panels, first strips and second switches disposed on the outer insulation panels A plurality of bridge insulation panels disposed over the first and second strips to cover the lip, a plurality of inner insulation panels and a plurality of inner insulation panels and a plurality of bridge insulation panels to cover the plurality of bridge insulation panels And a barrier, wherein the first strip has an extension extending above the transverse clearance to suppress deformation of the first and second strips due to loads applied to the first and second strips.

Insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention may further include a heat insulating filling is filled in the horizontal gap to support the extension of the first strip.

Insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention may further include a support member disposed on the lower surface of the extension of the first strip to support the extension of the first strip.

An extension of the first strip may be bent into the horizontal gap.

Insulating structure of the cryogenic liquid storage tank according to another embodiment of the present invention for achieving the above object, a plurality of insulating panels disposed along the longitudinal direction crossing the transverse direction and the transverse direction on the tank inner wall to cover the tank inner wall, A first strip disposed on these two insulation panels to cover the horizontal gap between the two insulation panels arranged to face each other in the horizontal direction among the plurality of insulation panels, facing each other in the longitudinal direction intersecting the horizontal direction among the plurality of insulation panels. A second strip disposed over these two insulation panels and partially overlying the first strip to cover the longitudinal gap between the two insulation panels arranged to be visible, the first strip being applied to the first strip and the second strip. To suppress deformation of the first and second strips due to the load, the transverse clearances above It has extending portions stored.

Cryogenic liquid storage tank according to an embodiment of the present invention for achieving the above object, the tank inner wall is provided with a storage space for storing the cryogenic liquid, vertical to cross the transverse direction and the transverse direction on the tank inner wall to cover the tank inner wall Among the plurality of insulation panels arranged along the direction, among the plurality of insulation panels, among the first strip and the plurality of insulation panels disposed on the two insulation panels to cover the horizontal gap between the two insulation panels arranged to face each other in the horizontal direction. A second strip disposed over these two insulation panels and partially overlying the first strip to cover the longitudinal gap between the two insulation panels arranged to face each other in a longitudinal direction that intersects the transverse direction; First and second strips due to loads applied to the first and second strips It has an extension extending over the horizontal gap to suppress the deformation of the.

Insulation structure according to the present invention has a first strip for covering a gap between two outer insulation panels adjacent to each other by the extension portion extending over the gap between the two outer insulation panels, due to the load applied to the strip during construction of the strip It can effectively prevent bending deformation. Therefore, the joining reliability of a strip can be improved and the sealing of a secondary barrier and the soundness in cryogenic temperature can be improved.

1 shows a cryogenic liquid storage tank according to an embodiment of the present invention.
Figure 2 is a perspective view showing a part of the insulating structure of the cryogenic liquid storage tank according to an embodiment of the present invention.
Figure 3 (a) is a cross-sectional view taken along the line I-I of Figure 2, Figure 3 (b) shows a case where the bending deformation of the strip occurred in the bonding process of the strip.
4 is a cross-sectional view taken along the line II-II of FIG. 2.
5 to 7 show various modifications of the thermal insulation structure for improving the bending rigidity of the first strip and the second strip in the cryogenic liquid storage tank according to the present invention.

Hereinafter, with reference to the accompanying drawings, a thermal insulation structure and a cryogenic liquid storage tank having the same according to an embodiment of the present invention will be described in detail.

In describing the present invention, the sizes and shapes of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of explanation. In addition, terms defined in consideration of the configuration and operation of the present invention may be changed according to the intention or custom of the user, the operator. These terms are to be construed in accordance with the meaning and concept consistent with the technical idea of the present invention based on the contents throughout the present specification.

1 and 2 and the cryogenic liquid storage tank 100 according to an embodiment of the present invention is the tank inner wall 110 and the tank inner wall 110 is provided with a storage space for storing the cryogenic liquid therein; Insulating structure 120 is coupled to the tank inner wall 110 to prevent heat transfer between the storage space. The thermal insulation structure 120 includes thermal insulation panels 121, 122, 123, primary barriers 124 disposed in a plurality of layers along a longitudinal direction B intersecting the horizontal direction A and the horizontal direction A, and It consists of a secondary barrier 125.

The insulation panels 121, 122, and 123 are divided into an outer insulation panel 121 and an inner insulation panel 122 and a bridge insulation panel 123 covering the outer insulation panel 121 coupled to the tank inner wall 110. Can be. The bridge insulation panel 123 is disposed between the inner insulation panels 122 to cover the gap between the two outer insulation panels 121. These insulation panels 121, 122, 123 are a protective plate 129 made of plywood, composite, or the like on one surface of the insulation 126, 127, 128, such as polyurethane foam. (130) 131 is made of a sandwich structure combined. The outer insulation panel 121 is fixed to the tank inner wall 110 by an adhesive or stud bolt (not shown), and the inner insulation panel 122 and the bridge insulation panel 123 are connected to the outside by a bonding method such as adhesive. It is fixed to the heat insulation panel 121.

The primary barrier 124 is to seal the storage space so that the cryogenic liquid stored in the storage space does not leak, and an anchor strip (not shown) installed on the inner insulation panel 122 or the bridge insulation panel 123. It includes a barrier sheet 132 of a metal material which is fixed to the welding. The barrier sheet 132 constituting the primary barrier 124 may be made of various metal materials that do not cause a decrease in physical properties due to brittleness at cryogenic temperatures such as stainless steel or aluminum. The primary barrier 124 has a plurality of wrinkles 133 for suppressing the generation of thermal stress due to heat shrink.

  The secondary barrier 125 is to seal the cryogenic liquid to the secondary when the primary barrier 124 is broken, and covers the outer insulation panel 121. The secondary barrier 125 includes a barrier sheet 134 coupled to the outer insulation panel 121 and a first strip 135 and a second strip 136 covering a gap between the outer insulation panels 121. . The first strip 135 and the second strip 136 are joined to the top surface of the barrier sheet 134 by an adhesive 137.

As illustrated in FIGS. 2 to 4, the first strip 135 has a horizontal gap between the two outer insulation panels 121 disposed to face each other in the horizontal direction A among the plurality of outer insulation panels 121. It is disposed on these two outer insulating panels 121 to cover 138. In addition, the second strip 136 may have a vertical gap between the two outer insulation panels 121 disposed to face each other in the longitudinal direction B intersecting with the horizontal direction A among the plurality of outer insulation panels 121. 139 is disposed over these two outer insulating panels 121. Here, the horizontal direction (A) is a direction in which the long side surfaces of the two outer insulation panels 121 facing each other, and the longitudinal direction (B) is a short side of the two outer insulation panels 121 facing each other. Indicate the viewing direction.

The gaps 138 and 139 between the outer insulation panels 121 are filled with the insulation filler 140. The insulation filler 140 is a gap 138 between the outer insulation panels 121 so as to increase insulation performance of the insulation structure 120 such as glass wool, insulation foam, and putty of a flexible material ( 139 may be made of various materials that can be inserted.

In order to secure the sealing force of the thermal insulation structure 120, the first strip 135 and the second strip 136 are continuously disposed and partially overlapped. Since the second strip 136 is bonded after the first strip 135 is bonded, the first strip 135 and the second strip 136 at the intersection of the first strip 135 and the second strip 136. ) Overlap. As shown in FIG. 3A, the second strip 136 has a two-layer structure having a portion in close contact with the top surface of the barrier sheet 134 and a portion in close contact with the top surface of the first strip 135. The portion in close contact with the top surface of the barrier sheet 134 of the second strip 136 and the portion in close contact with the top surface of the first strip 135 are connected to the inclined portion 141.

3 is a cross-sectional view taken along line II of FIG. 2.

As shown in FIG. 3A, after the first strip 135 and the second strip 136 are bonded, the first strip 135 and the second strip 136 to maintain a constant adhesive thickness. ) A constant pressure and temperature are applied. As a means for applying pressure to these strips 135 and 136, a pressurization device made of a flexible material such as an air bag that can be in close contact with the surface of the strips 135 and 136 can be used. As a means for providing a temperature, a heating element using electrical energy may be used.

As shown in FIG. 3B, the strip 135 and 136 may be bent in a longitudinal direction by pressure and temperature applied during the curing of the adhesive 137. Such deformation of the strips 135 and 136 tends to occur excessively in the gaps 138 and 139 between the outer insulation panels 121 without support means under the strips 135 and 136 due to the curing pressure. have. In addition, local expansion of the outer insulation panel 121, which occurs at high curing temperatures, can cause excessive thermal deformation of the strips 135, 136 located between the outer insulation panels 121.

This thermal deformation causes excessive deformation of the first strip 135 when the second strip 136 is bonded to the first strip 135 in an overlapping structure, which results in a thick joint thickness of the deformation site or two strips. Since the adhesive 137 is not filled between the 135 and 136, a leakage path P may be generated. If the thickness of the joint is thick, there is a problem in that the joint strength is lowered at an extremely low temperature and excessive thermal stress is generated at the joint site. When the leakage path P is generated, the secondary barrier 125 has a large drop in sealing performance. The stability and reliability of can be greatly reduced.

In order to solve this problem, a method of counteracting the deformation of the first strip 135 by increasing the amount of pressure applied in the curing process of the second strip 136 has been proposed, but this method has been applied to the outer insulation panel 121 due to the high pressure applied. ) May be broken, and sufficient response is difficult when the thickness and rigidity of the strips 135 and 136 are increased. In addition, in order to minimize thermal deformation, a method of lowering the curing temperature or shortening the temperature application time may be considered. However, this method reduces the degree of cure of the adhesive 137 to reduce the bonding strength, There is a disadvantage of increasing the bonding time. Therefore, in order to secure the bonding reliability, it is necessary to suppress deformation of the strips 135 and 136 at high curing pressures and temperatures.

To this end, the cryogenic liquid storage tank 100 according to an embodiment of the present invention extends the construction of the first strip 135 to suppress deformation of the strips 135 and 136 that may occur in the curing process. The specific structure is as shown in FIG. 4 is a cross-sectional view taken along the line II-II of FIG. 2. That is, the first strip 135 has a horizontal gap to suppress deformation of the first strip 135 and the second strip 136 due to the load applied to the first strip 135 and the second strip 136. 138 has an extension 142 extending above.

When the portion to which the pressure of the first strip 135 is applied is limited to the edge of the outer insulation panel 121, since the pressure is not applied to the extension 142 of the first strip 135, the extension of the extension 142 may be formed. Bend is suppressed. By the extension part 142, the first strip 135 has the effect of increasing the bending stiffness due to the increase in length, and the second strip 136 is supported by the extension part 142 to suppress bending deformation. Deformation of the strips 135 and 136 is suppressed by the action of the extension part 142, and it is possible to reduce the problem of deterioration in the bonding reliability that may occur when the second strip 136 is constructed.

5 to 7 show various modifications of the thermal insulation structure for increasing the bending stiffness of the first strip and the second strip.

Insulating structure 120 shown in FIG. 5 is a first strip 135 is filled with the insulating filler 140 filled in the horizontal gap 138 and the vertical gap 139 between the outer insulating panels 121 adjacent to each other. It is to support the extension portion 142 of. When the insulating filler 140 supports the lower surface of the extension part 142, the deformation of the extension part 142 due to the load may be more effectively prevented, and the supporting force of the extension part 142 may be increased. When the insulating filler 140 is a rigid rigid body, the bending rigidity of the first strip 135 and the second strip 136 may be further increased.

6, the support member 145 is coupled to the extension part 142 to support the extension part 142 of the first strip 135. The support member 145 may be coupled to the lower surface of the extension part 142 by a mechanical fastening method or a welding method. The support member 145 prevents deformation of the extension part 142 by supporting the extension part 142 in contact with the side surface of the barrier sheet 134 or the side surface of the outer insulation panel 121 and prevents deformation of the extension part 142. The bending stiffness of the two strips 136 can be further increased. The support member 145 may be coupled to the side of the outer insulation panel 121 or the side of the barrier sheet 134 to support the extension 142.

In the thermal insulation structure 120 illustrated in FIG. 7, the extension 142 of the first strip 135 is bent into the horizontal gap 138. When the bend 147 is provided in the first strip 135, the bending stiffness of the first strip 135 is further increased, and the supporting force of the first strip 135 with respect to the second strip 136 is increased, thereby increasing the strip 135. It is possible to more effectively suppress the deformation of 136).

As described above, the heat insulating structure 120 according to the present invention has a strip 135 (as the first strip 135 has an extension 142 extending over the gap 139 between the two outer heat insulating panels 121). It is possible to effectively prevent bending deformation due to the load applied to the strips 135 and 136 during the construction of the 136. Accordingly, the bonding reliability of the strips 135 and 136 can be improved, and the sealing property of the secondary barrier 125 and the integrity at cryogenic temperatures can be improved.

Embodiments of the present invention described above and illustrated in the drawings should not be construed as limiting the technical idea of the present invention. The protection scope of the present invention is limited only by the matters described in the claims, and those skilled in the art can improve and change the technical idea of the present invention in various forms. Accordingly, these modifications and variations are intended to fall within the scope of the present invention as long as it is obvious to those skilled in the art.

100: cryogenic liquid storage tank 110: tank inner wall
120: insulation structure 121: outer insulation panel
122: inner insulation panel 123: bridge insulation panel
124: primary barrier 125: secondary barrier
126, 127, 128: insulation 129, 130, 131: protective plate
132, 134: barrier sheet 135, 136: first, second strip
137: adhesive 138, 139: first and second direction clearance
140: insulating filler 142: extension
145: support member 147: bend

Claims (6)

In the insulating structure coupled to the tank inner wall to insulate the storage space provided inside the tank inner wall for storing the cryogenic liquid,
A plurality of outer insulation panels disposed on the inner wall of the tank in a longitudinal direction intersecting the transverse direction and the transverse direction to cover the inner wall of the tank;
A first strip disposed on the two outer insulating panels to cover the horizontal gap between the two outer insulating panels facing each other in the horizontal direction among the plurality of outer insulating panels;
A second strip disposed on the two outer insulation panels to cover a longitudinal gap between the two outer insulation panels arranged to face each other in the longitudinal direction among the plurality of outer insulation panels, the second strip being partially overlaid on the first strip;
A plurality of inner insulation panels disposed on the plurality of outer insulation panels to cover the plurality of outer insulation panels;
A plurality of bridge insulation panels disposed over the first strip and the second strip to cover the first strip and the second strip; And
And a first barrier disposed on the plurality of inner insulation panels and the plurality of bridge insulation panels to cover the plurality of inner insulation panels and the plurality of bridge insulation panels.
Wherein the first strip has an extension extending over the lateral clearance to suppress deformation of the first strip and the second strip due to loads applied to the first strip and the second strip. Insulation structure of liquid storage tank. The method of claim 1,
Insulating structure of the cryogenic liquid storage tank, characterized in that it further comprises an insulating filler filled in the lateral gap to support the extension of the first strip. The method of claim 1,
Insulating structure of the cryogenic liquid storage tank further comprises a support member disposed on the lower surface of the extension of the first strip to support the extension of the first strip. The method of claim 1,
Insulation structure of the cryogenic liquid storage tank, characterized in that the extension of the first strip is bent into the horizontal gap. In the insulating structure coupled to the tank inner wall to insulate the storage space provided inside the tank inner wall for storing the cryogenic liquid,
A plurality of thermal insulation panels disposed on the inner wall of the tank in a longitudinal direction intersecting the horizontal direction and the horizontal direction to cover the tank inner wall;
A first strip disposed on the two thermal insulation panels to cover the gap in the horizontal direction between the two thermal insulation panels disposed to face each other in the horizontal direction among the plurality of thermal insulation panels; And
A plurality of insulating panels disposed on these two insulating panels to cover the longitudinal gap between the two insulating panels disposed to face each other in the longitudinal direction crossing the transverse direction and partially overlapping the first strip. A second strip;
Wherein the first strip has an extension extending over the lateral clearance to suppress deformation of the first strip and the second strip due to loads applied to the first strip and the second strip. Insulation structure of liquid storage tank. An inner wall of the tank having a storage space for storing the cryogenic liquid;
A plurality of thermal insulation panels disposed on the inner wall of the tank in a longitudinal direction intersecting the horizontal direction and the horizontal direction to cover the tank inner wall;
A first strip disposed on the two thermal insulation panels to cover the gap in the horizontal direction between the two thermal insulation panels disposed to face each other in the horizontal direction among the plurality of thermal insulation panels; And
A plurality of insulating panels disposed on these two insulating panels to cover the longitudinal gap between the two insulating panels disposed to face each other in the longitudinal direction crossing the transverse direction and partially overlapping the first strip. A second strip;
Wherein the first strip has an extension extending over the lateral clearance to suppress deformation of the first strip and the second strip due to loads applied to the first strip and the second strip. Liquid storage tank.

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