JPH0246838B2 - TEIONEKIKAGASUCHOZOTANKUNODANNETSUKABE - Google Patents

Description

[Detailed Description of the Invention] (1) Field of Industrial Application This invention relates to an improvement in the heat insulating wall of a thin film type low temperature liquefied gas storage tank for storing low temperature liquefied gas under pressure close to atmospheric pressure. be.

(2) Conventional technology A thin-film type low-temperature liquefied gas storage tank has a rigid outer tank with a heat-insulating wall of a required thickness provided on the inner wall surface, and stores low-temperature liquefied gas inside the heat-insulating wall. An inner tank made of a thin metal plate is provided, and the tank internal pressure is transmitted to the outer tank via a heat insulating wall and supported by the outer tank. Therefore, in addition to the insulating properties that the thin-film type low-temperature liquefied gas storage tank should have, the insulating walls must also have sufficient compression resistance to withstand static and dynamic tank internal pressure. It won't happen.

Therefore, conventionally, the insulation wall of the thin-film type low-temperature liquefied gas storage tank has a insulation panel made of high-density foamed synthetic resin or the like fixed to the inner wall of the outer tank using bolts or adhesive. It is used.

As mentioned above, the thin-film type low-temperature liquefied gas storage tank has a structure in which the internal pressure of the tank is supported by the outer tank through the heat insulating wall, so there is no gap between the heat insulating panel and the inner wall surface of the outer tank. In other words, it is necessary to fix the insulation panel so that it does not come into point contact with the inner wall surface of the outer tank, and there is a risk that a concentrated load will be applied at the point contact area and the insulation panel will break. However, on the inner wall surface of the outer tank as described above, dimensional errors on the surface such as local deformation and unevenness are unavoidable, and materials with a smooth outer surface such as insulation panels have voids on such surfaces. It is impossible to bring them into close contact without causing this. Therefore, measures have been taken to increase the strength of the insulation panels and outer tank, or to smoothen the inner wall surface of the outer tank by cutting, but all of these measures significantly increase the construction cost of the tank. There are disadvantages that increase the

(3) Problems to be Solved by the Invention The present invention eliminates all the drawbacks of the heat insulating walls in the conventional low-temperature liquefied gas storage tanks mentioned above, has no structural defects, and exhibits an excellent heat insulating effect. The object of the present invention is to provide a heat insulating wall for a thin film type low temperature liquefied gas storage tank which is both economical and economical.

(4) Means for Solving the Problems The present invention has been made in view of the above-mentioned viewpoints, and includes a material having both heat insulation properties and compression resistance for the inner wall side of an outer tank made of a rigid structure. In the insulation wall of a low-temperature liquefied gas storage tank in which a heat insulation panel of a desired shape is installed, epoxy resin, polyurethane resin, unsaturated polyester resin, epoxy acrylate resin is placed between the inner wall surface of the outer tank and the insulation panel. The objective is to obtain an insulating wall for a low temperature liquefied gas storage tank in which a backing material made of a flexible material containing a thermosetting resin of polyaddition or copolymerization reaction type is arranged in a compressed state. .

(5) Effects and Examples Next, the present invention will be explained in detail based on the accompanying drawings showing the embodiments thereof.

In the drawing, 1 is an outer tank with a rigid structure made of ordinary steel plates, prestressed concrete, etc., and the inner wall surface 2 is solidified with a flexible material containing a liquid composition that does not produce by-products when solidified. A backing material 3 made of The heat insulating panel 4 is integrally fixed to the inner wall surface 2 of the outer tank by the self-adhesive force exerted when the liquid composition contained in the bolts 5 and/or the backing material 3 solidifies, thereby forming a heat insulating wall 6. There is. Inside the heat insulating wall 6, an inner tank 7 made of a thin plate of a low temperature metal material such as stainless steel or aluminum alloy is provided.

The liquid composition contained in the backing material 3 and which does not produce by-products upon solidification is a polyaddition or copolymerization type thermosetting resin such as epoxy resin, polyurethane resin, unsaturated polyester resin, or epoxy acrylate resin. Particularly preferred are liquid reactive compositions before curing. Known thixotropic additives such as finely powdered silica and calcium carbonate may be added to this. The flexible backing material 3 is made of soft plastic foam with open cells such as soft urethane foam, inorganic or organic fibers, using a small amount of adhesive or using the entanglement of fibers without using adhesive. A bulky elastic sheet of felt, blanket, board, paper, or a combination of these and a woven or braided material made of the above-mentioned fibers is used.
A liquid composition that does not produce by-products upon solidification is usually a two-component system, and each component is mixed and then contained in the backing material 3, which is the porous flexible material, using a means such as depping.

The heat insulation panel 4 is made of hard urethane foam,
High-density foamed synthetic resins with excellent heat insulation and compression resistance, such as polyisocyanurate foam, polystyrene foam, and polyvinyl chloride foam, are suitable, and they can be processed into the desired shape from a pre-foamed block material, or processed into the desired shape. It is formed using means such as foam molding using a mold. The heat insulating panel 4 may use the above-mentioned materials alone, or alternatively, as shown in the figure, it may have a sandwich structure in which a surface material 8 such as plywood, synthetic resin, metal plate, glass cloth, etc. is integrally bonded.
The shape of the joint surface 9 of the heat insulating panel 4 is not particularly limited, and can be formed into various shapes such as a straight line, a stepped shape, an inclined shape, and a key joint.

The backing material 3 is placed on the inner wall surface 2 of the outer tank or the heat insulating panel 4, which is the adherend, before the liquid composition contained therein solidifies, and the backing material 3 is attached to the inner wall surface 2 of the outer tank or the heat insulating panel 4, which is the adherend, and the bolts 5 or the heat insulating panel 4 installed in advance on the inner wall surface of the outer tank are attached. Using an appropriate pressing jig (not shown), the heat insulating panel is fixed in a compressed state so that the porous and flexible backing material 3 is brought into close contact with the inner wall surface 2. The backing material 3 before solidification is stretchable and therefore easily compressed and completely adheres to the contact surface of the outer tank inner wall surface 2 and the insulation panel 4, and if left as it is, the liquid composition will harden. As the reaction progresses, it finally ceases to be liquid, producing a strong and hard backing material 3, and the backing material 3 and the heat insulating panel 4 are integrally adhered to the inner wall surface 2 of the outer tank due to its self-adhesive force. A heat insulating wall 6 is formed. The bolts 5 used for temporarily fixing the heat insulating panel 4 may be left as they are, or may be removed after the liquid composition has solidified.

(6) Effects of the Invention As described above, this invention has the advantage that the backing material that easily adheres to the inner wall of the outer tank and the heat insulating panel is disposed between the inner wall of the outer tank and the heat insulating panel. Even if the dimensional accuracy of the inner wall surface of the outer tank is low and unevenness exists, it is possible to completely eliminate the voids that occur on the contact surface between the two, thereby eliminating the concentrated load of the tank internal pressure and ensuring uniform pressure. is transmitted to the outer tank,
There is no need to make the outer tank and the insulation panel uneconomically strong, and the insulation wall is very easy to form, and the construction cost of the low-temperature liquefied gas storage tank can be significantly reduced.

Further, according to the present invention, since the inner wall surface of the outer tank is completely covered with the backing material, it is possible to completely prevent the intrusion of foreign substances such as moisture that reduce the heat insulation effect, and the inner wall surface of the outer tank is completely covered with the backing material. Since there are no gaps between the insulation panel and the insulation panel, there is no air convection that would reduce the insulation effect, so the insulation effect is extremely excellent. In addition, the backing material does not allow low-temperature liquefied gas to penetrate and has an insulating effect, so even if low-temperature liquefied gas leaks, it will penetrate and cool the outer tank, preventing external damage caused by low-temperature embrittlement. Risks that could lead to destruction of the tank are prevented. Moreover, since the surface level difference at the joint of the heat insulation panel can be easily removed, a heat insulation wall with extremely high surface precision can be formed.

[Brief explanation of drawings]

FIG. 1 is a partially cutaway perspective view of a heat insulating wall of a low-temperature liquefied gas storage tank showing an embodiment of the present invention, and FIG. 2 is a sectional view of a main part of the heat insulating wall. 1...Outer tank, 2...Outer tank inner wall surface, 3...Backing material, 4...
Heat insulation panel, 6... Heat insulation wall, 7... Inner tank, 8... Panel surface material, 9... Panel joint.

Claims (1)

[Claims] 1. In the insulating wall of a low temperature liquefied gas storage tank, in which an insulating panel of a desired shape made of a material having both heat insulating properties and compression resistance is arranged on the inner wall side of an outer tank made of a rigid structure, A backing material made of a flexible material containing polyaddition or copolymerization thermosetting resin such as epoxy resin, polyurethane resin, unsaturated polyester resin, or epoxy acrylate resin is installed between the tank inner wall surface and the insulation panel. An insulating wall of a low-temperature liquefied gas storage tank, characterized in that it is arranged in a compressed state.