KR20110049598A - Heat insulation structure, cryogenic liquid storage tank having the same and construction method for the heat insulation structure - Google Patents

Abstract

PURPOSE: A heat insulation structure, a cryogenic liquid storage tank therewith, and a construction method thereof are provided to reduce thermal contraction by allowing the thickness of an adhesive layer to be uniform. CONSTITUTION: A heat insulation structure comprises outer insulation panels(210), inner insulation panels(220), sub barriers(240), middle insulation panels(250), adhesive layers(270), and support units. The outer insulation panels are coupled to the inner wall of a cryogenic liquid storage tank. The inner insulation panels are attached on the top of the outer insulation panel. The sub barriers cover gaps between the outer insulation panels. The middle insulation panels are coupled to the top of the sub barriers to cover the sub barriers. The adhesive layers are inserted between the sub barriers and the middle insulation panels. The support units are arranged in the middles of the adhesive layers and support one surface of the middle insulation panels.

Description

HEAT INSULATION STRUCTURE, CRYOGENIC LIQUID STORAGE TANK HAVING THE SAME AND CONSTRUCTION METHOD FOR THE HEAT INSULATION STRUCTURE}

The present invention relates to a cryogenic liquid storage tank, and more particularly, to an insulating structure for insulating a storage space in which cryogenic liquid is stored, and a construction method of a cryogenic liquid storage tank and an insulating structure having the same.

Cryogenic liquids, such as LNG, Liquid Argon (LAR), Liquid Nitrogen (LIN), Liquid Oxygen (LOX), and Liquid Hydrogen (LH2), are stored in insulated storage tanks to minimize liquid loss by evaporation. Stored or transported in stored condition.

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.

Membrane type liquefied natural gas storage tanks include MARK-III type and NO-96 type developed by Gaz Transport et Technigaz (GTT), France. These liquefied natural gas storage tanks have an insulating structure for preventing the leakage of liquefied natural gas and insulating the storage space in which the liquefied natural gas is stored. Among the MARK-III and NO-96 types, the Mark-III liquefied natural gas storage tank is preferred to the NO-96 type because of its ease of construction and low material cost.

The insulation structure for the MARK-III type liquefied natural gas storage tank includes a kitchen wall whose surface is in direct contact with the cryogenic liquefied natural gas, and an insulating panel coupled to the outer surface of the kitchen wall. The insulation panel has a sandwich structure including an inner insulation panel coupled to the kitchen wall and an outer insulation panel fixed to the tank inner wall. The inner heat insulating panel and the outer heat insulating panel are each composed of a plywood protecting plate and a heat insulating material such as urethane foam.

The kitchen wall, which is in contact with the cryogenic liquefied natural gas, is made by welding a metal sheet such as stainless steel. Since the kitchen wall may be damaged due to thermal stress when the heat shrink occurs, the kitchen wall has a lattice wrinkled portion to have low in-plane stiffness. The crease reduces deformation by a certain amount when heat shrinkage occurs, thereby reducing the thermal stress at the weld.

The outer insulation panel is fixed to the tank inner wall by a stud bolt welded to the tank inner wall. A gap is generated between the outer insulation panels disposed adjacent to each other, and the gap is covered with a barrier. The secondary barrier prevents the cryogenic liquefied natural gas from flowing toward the tank inner wall when the kitchen wall is damaged. On one side of the secondary barrier, an intermediate panel having a structure such as an inner insulation panel is bonded through an adhesive. The middle panel serves to insulate the storage space where the liquefied natural gas is stored while supporting the kitchen wall with the inner insulation panel.

However, in the conventional heat insulating structure, it is difficult to uniformly control the thickness of the adhesive layer formed between the secondary barrier and the intermediate insulation panel in bonding the intermediate insulation panel to one surface of the secondary barrier using an adhesive. If the thickness of the adhesive layer between the secondary barrier and the middle insulation panel is non-uniform, the secondary barrier may be damaged due to the difference in deformation and deformation amount due to thermal shrinkage caused by cryogenic liquids, resulting in inferior product stability and reliability. do.

The present invention is to solve the above problems, by uniformizing the thickness of the adhesive layer provided between the secondary barrier and the intermediate panel, heat insulating structure that can reduce the risk of damage due to heat shrink and improve the reliability of the product, It is an object of the present invention to provide a method for constructing a cryogenic liquid storage tank and an insulating structure having the same.

In addition, the present invention is a heat insulating structure that can make the thickness of the adhesive layer provided between the secondary barrier and the intermediate heat insulating panel in a simple manner without compromising the workability of the product, the construction method of cryogenic liquid storage tank and heat insulating structure having the same The purpose is to provide.

Insulating structure for cryogenic liquid storage tank according to an embodiment of the present invention for achieving the above object, to prevent heat transfer between the tank inner wall and the storage space in which the cryogenic liquid is stored, the tank inner wall to cover the tank inner wall A plurality of outer insulation panels coupled to the upper surface, a plurality of inner insulation panels attached to the outer insulation panels to cover the outer insulation panels, and covering a gap between two outer insulation panels disposed adjacent to each other among the plurality of outer insulation panels. A secondary barrier, an intermediate insulating panel coupled to the secondary barrier to cover the secondary barrier, an adhesive layer interposed between the secondary barrier and the intermediate insulating panel for adhesion of the secondary barrier and the intermediate insulating panel, the secondary barrier and The adhesive to maintain a constant thickness of the adhesive layer between the intermediate insulation panels Is disposed in the middle comprises a supporting means for supporting one surface of the intermediate insulation panels.

The support means may be a gap member having a first contact surface in contact with the secondary barrier and a second contact surface in contact with the intermediate insulation panel.

The gap member may have a width of the first contact surface smaller than that of the second contact surface.

The gap member may further include a first inclined surface and a second inclined surface respectively connected to both ends of the first contact surface to be inclined toward the second contact surface.

The support means may be a protruding portion integrally provided on one surface of the intermediate insulating panel facing the sub barrier and protruding toward the sub barrier and having a contact surface in contact with the sub barrier.

The protrusion may further include a first inclined surface and a second inclined surface respectively connected to both ends of the contact surface to be inclined toward one surface of the intermediate insulation panel.

Cryogenic liquefied gas 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 cryogenic liquid therein, a plurality of coupled to the tank inner wall to cover the tank inner wall An outer insulation panel of the plurality of inner insulation panels attached on the outer insulation panel to cover the outer insulation panel, a side wall covering a gap between two outer insulation panels disposed adjacent to each other of the plurality of outer insulation panels, An intermediate insulation panel coupled to the secondary barrier to cover the secondary barrier, a kitchen wall covering the inner insulation panel and the intermediate insulation panel to prevent the cryogenic liquid from penetrating into the inner insulation panel and the intermediate insulation panel; Between the secondary barrier and the intermediate insulating panel for bonding the secondary barrier and the intermediate insulating panel An adhesive layer interposed therebetween, and support means for supporting the intermediate insulating panel disposed in the middle of the adhesive layer to maintain a constant thickness of the adhesive layer placed between the secondary barrier and the intermediate insulating panel.

Method for constructing a heat insulating structure according to an embodiment of the present invention for achieving the above object, the step of preparing a plurality of unit heat insulating panel structure with an inner heat insulating panel attached to the outer heat insulating panel, the plurality of unit heat insulating panel structure Fixing to the inner wall of the tank, covering a gap between each outer insulation panel of two unit insulation panel structures disposed adjacent to each other among the plurality of unit insulation panel structures with a barrier, and an intermediate insulation panel for covering the barrier; Preparing a step, by providing an adhesive layer on the secondary barrier comprises the step of attaching the intermediate insulation panel to the secondary barrier. In the step of attaching the intermediate insulation panel, between the side wall facing the side wall and the side wall of the intermediate insulation panel so that the thickness of the adhesive layer between the side wall and the intermediate insulation panel can be maintained uniformly. Place the support means.

Insulating structure according to an embodiment of the present invention and the cryogenic liquid storage tank having the same, it is possible to make the thickness of the adhesive layer provided between the secondary barrier and the intermediate panel using a simple supporting means, the intermediate insulation panel and It is possible to reduce the risk of breakage of the secondary barrier due to uneven adhesion thickness between the secondary barriers.

In addition, it is possible to prevent the height difference between the intermediate insulation panel and the inner insulation panel, it is possible to install a stable kitchen wall.

In addition, since the thickness of the adhesive layer between the secondary barrier and the intermediate panel can be made constant by a simple method, the structural stability of the product can be effectively improved without degrading the workability of the product.

Hereinafter, with reference to the accompanying drawings will be described for the construction of a heat insulating structure and a cryogenic liquid storage tank and heat insulating structure having the same according to an embodiment of the present invention.

In describing the present invention, the size or shape of the components shown in the drawings may be exaggerated or simplified for clarity and convenience of description. In addition, terms that are specifically defined in consideration of the configuration and operation of the present invention may vary depending on the intention or custom of the user or 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 is a side cross-sectional view showing a portion of a cryogenic liquid storage tank according to an embodiment of the present invention.

In the cryogenic liquid storage tank according to an embodiment of the present invention shown in Figure 1 is a heat transfer between the tank inner wall 100 and the tank inner wall 100 and the storage space is provided with a storage space for storing the cryogenic liquid therein Insulation structure 200 is coupled to the tank inner wall 100 to prevent the. The insulation structure 200 includes a plurality of outer insulation panels 210 covering the tank inner wall 100, a plurality of inner insulation panels 220 covering the plurality of outer insulation panels 210, and two outer insulation panels 210 adjacent to each other. A plurality of secondary barriers 240 covering a gap between the plurality of secondary barriers 240, a plurality of intermediate insulation panels 250 covering the plurality of secondary barriers 240, a plurality of inner insulation panels 220, and a plurality of intermediate insulation panels ( A primary barrier 260 covering 250.

The outer insulation panel 210 includes a panel-shaped insulation 211 and a protective plate 212 attached to one surface of the insulation 211. As the heat insulating material 211, a polyurethane foam having a high heat insulating efficiency may be used, and as the protective plate 212, plywood or a composite material may be used. The inner insulation panel 220 and the intermediate insulation panel 250 have a structure similar to that of the outer insulation panel 210, and include insulation materials 221, 251, and protection plates 222, 252, respectively.

The kitchen wall 260 is a part directly contacting the cryogenic liquid stored in the storage space and is made of metal such as stainless steel, and has a corrugation 261 to reduce the risk of breakage due to heat shrinkage. The secondary barrier 240 is made of a composite material or a metal material, and serves to prevent the cryogenic liquid from flowing toward the tank inner wall 100 when the kitchen wall 260 breaks.

An adhesive layer 270 is provided between the intermediate insulation panel 250 and the secondary barrier wall 240 in which an adhesive is applied to attach the intermediate insulation panel 250 to the secondary barrier wall 240. In the middle of the adhesive layer 270, a gap member (support means) 280 is disposed to support the intermediate insulation panel 250 so that a gap having a predetermined height is provided between the intermediate insulation panel 250 and the secondary barrier 240. do. The gap member 280 serves to maintain a constant thickness of the adhesive layer 270 between the intermediate insulation panel 250 and the subwall 240.

As shown in FIG. 1, the gap member 280 faces the first contact surface 281 which contacts the secondary barrier 240, the second contact surface 282 which contacts the intermediate insulation panel 250, and the second contact surface 282. A first inclined surface 283 and a second inclined surface 284 are respectively connected to both left and right ends of the first contact surface 281 so as to be inclined. The width of the first contact surface 281 is smaller than the width of the second contact surface 282. The structural feature of the gap member 280 is to reduce as much as possible the amount of adhesive that can be placed between the secondary barrier 240 and the first contact surface 281 of the gap member 280, the secondary barrier 240 and When the compressed adhesive exists between the first contact surface 281 or more, a problem arises that a construction error occurs during the construction of the thermal insulation structure 200.

As such, the thermal insulation structure 200 according to the embodiment of the present invention is the intermediate insulation panel 250 and the secondary barrier by the gap member 280 disposed between the intermediate insulation panel 250 and the secondary barrier 240. A predetermined gap is provided between the 240, whereby the thickness of the adhesive layer 270 between the intermediate insulation panel 250 and the subwall 240 may be maintained uniformly. In addition, it is possible to reduce the height difference between the inner insulation panel 220 and the intermediate insulation panel 250 due to the thickness irregularity of the adhesive layer 270.

2A and 2B illustrate a method of constructing a heat insulating structure according to an embodiment of the present invention using the aforementioned gap member 280.

2A illustrates a state in which the outer insulation panel 210 is coupled to the tank inner wall 100, and the inner insulation panel 220 and the secondary barrier 240 are coupled to the outer insulation panel 210. The outer insulation panel 210 and the inner insulation panel 220 are provided in a unit insulation panel structure 230 coupled to each other. The outer insulation panel 210 is coupled to the tank inner wall 100 by a method such as mechanical bonding by stud bolt or adhesion by adhesive. The secondary barrier 240 is partially attached to one outer insulation panel 210 so as to cover a gap between two outer insulation panels 210 disposed adjacent to each other, and the other portion is attached to the other outer insulation panel 210. do.

After the secondary barrier 240 is attached to the two outer insulation panels 210 disposed adjacent to each other, the gap member 280 is coupled onto the secondary barrier 240. Here, the first contact surface 281 of the gap member 280 may be attached to the secondary wall 240 by an adhesive, an adhesive film, Velcro or other various adhesive means.

After the gap member 280 is coupled to the subwall 240, an adhesive is applied to one surface of the subwall 240 to which the gap member 280 is attached, as shown in FIG. 2B, so that the adhesive layer 270 is formed. Prepared. Subsequently, after the adhesive layer 270 is provided, the intermediate insulation panel 250 is placed on the adhesive layer 270 so that the intermediate insulation panel 250 is attached to the secondary barrier 240. At this time, the second contact surface 282 of the gap member 280 contacts the intermediate insulation panel 250 to support the intermediate insulation panel 250.

3A and 3B illustrate a method of constructing a heat insulating structure according to another embodiment of the present invention using the aforementioned gap member 280.

2A and 2B, the construction method of the insulating structure illustrated in FIG. 2A and 2B is to bond the gap member 280 to the secondary barrier 240, and then apply an adhesive to the secondary barrier 240. As such, after installation of the barrier wall 240, an adhesive layer 270 is first provided on the barrier wall 240. As shown in FIG. 3B, the gap member 280 is attached to one surface of the intermediate insulation panel 250 that faces the secondary barrier 240, and simultaneously on the secondary barrier 240 at the same time as the intermediate insulation panel 250. Attached. Here, the second contact surface 282 of the gap member 280 may be attached to one surface of the intermediate insulation panel 250 by an adhesive, an adhesive film, Velcro or other various adhesive means.

When attaching the intermediate insulation panel 250 to which the gap member 280 is attached to the adhesive layer 270, the adhesive lying under the gap member 280 is pressed by the gap member 280. The adhesive pressed by the gap member 280 is smoothly pushed in the direction away from the first contact surface 281 by the first inclined surface 283 and the second inclined surface 284, so that the negative barrier 240 and the gap member ( 280) does not accumulate more than a certain thickness.

On the other hand, Figures 4 and 5 show other embodiments of the support means for supporting one surface of the intermediate insulation panel 250 facing the secondary barrier 240. In each of these embodiments, the support means are protrusions 255 and 257 integrally provided on one surface of the intermediate insulation panel 250 facing the sub barrier 240 to protrude toward the sub barrier 240.

In the protrusion 255 illustrated in FIG. 4, a part of the heat insulating material 251 of the intermediate heat insulation panel 250 protrudes toward the secondary barrier 240. The protrusion 257 shown in FIG. 5 is also a part of the heat insulating material 251 of the intermediate insulation panel 250 protrudes toward the secondary barrier 240, but the point having the first inclined surface 258 and the second inclined surface 259 It is different from the protrusion 255 shown in FIG. In addition to the illustrated shape, the shape or structure of the protrusion may be variously changed.

As described above, the thermal insulation structure 200 and the cryogenic liquid storage tank having the same according to an embodiment of the present invention is disposed between the intermediate insulation panel 250 and the secondary barrier wall 240 of the intermediate insulation panel 250. By using the supporting means having a simple structure for supporting one surface, the thickness of the adhesive layer 270 provided between the intermediate insulation panel 250 and the secondary wall 240 can be kept uniform. Therefore, it is possible to reduce the risk of breakage of the secondary barrier 240 due to non-uniform thickness of adhesion between the intermediate insulation panel 250 and the secondary barrier 240.

The 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 change and change the technical idea of the present invention in various forms. Accordingly, such improvements and modifications will fall within the protection scope of the present invention as long as it will be apparent to those skilled in the art.

1 is a side cross-sectional view showing a portion of a cryogenic liquid storage tank according to an embodiment of the present invention.

2A and 2B illustrate a method of constructing a heat insulating structure according to an embodiment of the present invention.

3A and 3B illustrate a method of constructing a heat insulating structure according to another embodiment of the present invention.

4 and 5 show another embodiment of the support means disposed between the secondary barrier and the intermediate insulation panel.

<Explanation of symbols for the main parts of the drawings>

100 tank inner wall 200 insulation structure

210: outer insulation panels 211, 221, 251: insulation

212: 222, 252: protective plate 220: inner insulation panel

225, 257: protrusion 258, 283: first inclined surface

259 and 284: second inclined surface 230: unit insulation panel structure

240: barrier 250: intermediate insulation panel

260: kitchen wall 270: adhesive layer

280: gap member 281, 282: first, second contact surface

Claims (10)

In the insulating structure for cryogenic liquid storage tank coupled to the tank inner wall to prevent heat transfer between the tank inner wall and the storage space in which the cryogenic liquid is stored, A plurality of outer insulation panels coupled to the tank inner wall to cover the tank inner wall; A plurality of inner insulation panels attached to the outer insulation panels to cover the outer insulation panels; A secondary barrier covering a gap between two outer insulation panels disposed adjacent to each other among the plurality of outer insulation panels; An intermediate insulation panel coupled to the secondary barrier to cover the secondary barrier; An adhesive layer interposed between the secondary barrier and the intermediate insulation panel to bond the secondary barrier to the intermediate insulation panel; And Cryogenic liquid, characterized in that it comprises a support means for supporting one side of the intermediate insulation panel disposed in the middle of the adhesive layer to maintain a constant thickness of the adhesive layer placed between the secondary barrier and the intermediate insulation panel Insulation structure for storage tank. The method of claim 1, The support means is a heat insulating structure for cryogenic liquid storage tank, characterized in that the gap member having a first contact surface in contact with the secondary barrier and the second contact surface in contact with the intermediate insulating panel. The method of claim 2, The gap member is a heat insulating structure for cryogenic liquid storage tank, characterized in that the width of the first contact surface is smaller than the width of the second contact surface. The method of claim 3, wherein The gap member further includes a first inclined surface and a second inclined surface respectively connected to both ends of the first contact surface to be inclined toward the second contact surface. The method of claim 1, The support means is a heat insulating structure for cryogenic liquid storage tank, characterized in that the projecting portion is provided integrally on the one surface facing the sub-barrier of the intermediate insulating panel so as to project toward the sub-barrier and having a contact surface in contact with the sub-barrier. The method of claim 5, The protrusion part further includes a first inclined surface and a second inclined surface respectively connected to both ends of the contact surface to be inclined toward one surface of the intermediate heat insulating panel. An inner wall of a tank having a storage space for storing cryogenic liquids therein; A plurality of outer insulation panels coupled to the tank inner wall to cover the tank inner wall; A plurality of inner insulation panels attached to the outer insulation panels to cover the outer insulation panels; A secondary barrier covering a gap between two outer insulation panels disposed adjacent to each other among the plurality of outer insulation panels; An intermediate insulation panel coupled to the secondary barrier to cover the secondary barrier; A kitchen wall covering the inner insulation panel and the intermediate insulation panel to prevent the cryogenic liquid from penetrating into the inner insulation panel and the intermediate insulation panel; An adhesive layer interposed between the secondary barrier and the intermediate insulation panel to bond the secondary barrier to the intermediate insulation panel; And Cryogenic liquid storage tank comprising a support means for supporting the intermediate insulation panel disposed in the middle of the adhesive layer to maintain a constant thickness of the adhesive layer placed between the secondary barrier and the intermediate insulation panel . The method of claim 7, wherein The support means is a cryogenic liquid storage tank, characterized in that the gap member having a first contact surface in contact with the secondary barrier and the second contact surface in contact with the intermediate insulating panel. The method of claim 7, wherein The support means is a cryogenic liquid storage tank, characterized in that the projecting portion having a contact surface which is integrally provided on one surface facing the sub-barrier of the intermediate insulating panel so as to protrude toward the sub-barrier and in contact with the sub-barrier. In the construction method of the thermal insulation structure covering the inner surface of the tank inner wall with an insulating structure to prevent heat transfer between the tank inner wall and the storage space in which the cryogenic liquid is stored, Preparing a plurality of unit insulation panel structures having an inner insulation panel attached on the outer insulation panel; Fixing the plurality of unit insulation panel structures to the inner wall of the tank; Covering a gap between each outer insulation panel of two unit insulation panel structures disposed adjacent to each other among the plurality of unit insulation panel structures with a negative barrier; Preparing an intermediate insulation panel to cover the secondary barrier; And An adhesive layer is provided on the secondary barrier and the intermediate insulation panel is disposed on the adhesive layer, so that the thickness of the adhesive layer between the secondary barrier and the intermediate insulation panel can be uniformly maintained. And attaching the intermediate insulation panel to the sub-barrier by arranging a supporting means between one side of the panel and the surface facing the sub-barrier.

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