JPS583156B2 - Teion Ekika Gastiyo Zou Tankno Dannetsuhekki - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION This invention relates to an improvement in the insulating wall of a low temperature liquefied gas storage tank.

A thin-film type low-temperature liquefied gas in which an insulating wall of a required thickness is provided on the inner wall surface of an outer tank made of a rigid structure, and an inner tank for storing the low-temperature liquefied gas is provided inside the insulating wall. In storage tanks, the insulating walls need to have compression resistance in addition to their original insulating properties, and for this reason, conventionally, this type of insulating wall has been made of materials such as high-density foamed synthetic resin or plywood. Insulating materials that do not have compression resistance by themselves, such as powder insulation materials such as perlite, fibrous insulation materials such as glass wool and rock wool, etc., are used in box-shaped bodies made of materials that have no insulation effect but have good compression resistance. Insulation blocks filled with

However, among the conventional insulation walls mentioned above, foamed synthetic resin insulation materials are expensive and therefore have the disadvantage of significantly increasing the manufacturing cost of low-temperature liquefied gas storage tanks. There are fatal defects such as the internally filled insulation material gradually sinking downward due to vibrations, abrasion, and abrasion, creating a void above the insulation block and losing its insulation effect.

The object of the present invention is to provide an insulating wall for a thin-film type low-temperature liquefied gas storage tank that eliminates all the drawbacks of the conventional insulating wall described above, has an extremely excellent insulating effect, and is highly economical. It is something.

The present invention will be described in detail below with reference to the accompanying drawings showing embodiments thereof.

In the drawing, 1 is an outer tank with a rigid structure made of ordinary steel plate, prestressed concrete, etc., and its inner wall surface 2 is covered with inorganic compression-resistant shaped insulation material 3 and plywood, FRP board, FRTP board, metal plate, etc. Plate-like bodies 4 are alternately arranged in a plurality of layers, and the seams between adjacent plate-like bodies 4 are sealed with adhesive or the like.

5 is 9% nickel steel provided on the inner side of the insulation wall;
The inner tank is made of a thin sheet of low-temperature metal such as aluminum alloy.

The material for the inorganic compression-resistant shaped heat insulating material 3 is calcium silicate heat insulating material, which has been commonly used as a high temperature heat insulating material.
Pearlite heat insulating material is suitable because it is extremely inexpensive and has excellent compression resistance and heat insulation effect.

The thickness of these heat insulating materials used is 25 to 100 mm, and it is preferable to use the heat insulating materials by laminating them into at least two layers.

The inorganic compression-resistant shaped heat insulating material 3 is adhered to the outer tank inner wall surface 2 and the plate-shaped body 4 using an adhesive such as epoxy resin, unsaturated polyester resin, epoxy acrylate resin, foamed or non-foamed urethane elastomer. Also, glass wool,
It may also be loaded with cushioning materials such as chopped strand mats, asbestos foam, polyethylene foam, etc.

Further, it is preferable that the butt joints 6 of adjacent heat insulating materials 3 are also filled with the cushioning material.

Preferably, support plates 7 for heat insulating material are provided at appropriate intervals on the vertical inner wall surface 2, and the support plates 7 ensure that the heat insulating material 3 is held in a predetermined position.

The plate-like body 4 may be connected to a suspension rod (not shown) provided on the tank ceiling or the like.

A heat insulating material 3 and a plate-like body 4 are installed on the inner wall surface 2 of the outer tank in a straight line (
A bolt 8 is attached through the hole (see Figure 2) or indirectly (see Figure 3), and an elastic heat insulating material such as glass wool is press-fitted into the gap 9 near the bolt 8. Ensure the insulation effect of the part.

If necessary, a heat insulating material may be interposed between the bolts 8 to prevent heat from entering through the bolts 8.

A pressurizing device 10 such as a spring is provided at the tip of the bolt 8, and the heat insulating material 3 is always kept in a compressed state by the inner wall surface 2 of the outer tank and the plate-shaped body 4.

The pressurizing device 10 and the penetrating portion in the vicinity thereof are covered with a fluid-impermeable liner 11 through the heat insulating material 9 to prevent foreign matter from entering the heat insulating material 3 that would reduce the insulation effect, and to protect the pressurizing device 10 from entering. In addition to ensuring normal function at all times, this also prevents heat from entering through the 8ft bolt.

By holding the heat insulating material in a compressed state in this way, even if the heat insulating material contracts at low temperatures, it will not slip off.

This invention uses a backing member 12 of an appropriate size such as plywood, plastic plate, metal plate, etc., and attaches a heat insulating panel 13 (see FIG. 4) having the heat insulating layer formed on one side of the backing member 12 with bolts and nuts. The panel is attached to the inner wall surface 2 of the outer tank using a fixing device 14 such as 14 and/or an adhesive, and a separately formed single heat insulating material 15 is filled at the butt joint of the heat insulating panel 13 together with an elastic heat insulating material. liner 1 on the upper side.
1 may be provided to form a heat insulating wall.

As described above, in this invention, the insulation material of the low-temperature liquefied gas storage tank is completely covered with a material that does not allow any foreign matter to pass through, which would cause a reduction in the insulation effect.
Although it is extremely cheap, has good compression resistance, and is completely nonflammable, this type of insulation material has no permeation resistance to the fluid and there is no effective method for attaching it to the surface to be insulated. Since it is possible to use a porous molded heat insulating material, which has been considered impossible to use in the past, low-temperature liquefied gas storage tanks can be manufactured at extremely low cost.

Furthermore, in this invention, the mutual movement of the constituent materials constituting the heat insulation wall is not restricted due to thermal contraction, and they can move freely, so there is no generation of thermal stress and there is no risk of breakage. In addition, since the sliding surfaces and the voids that occur due to free movement are filled with an elastic material, there is no wear of the material or the creation of voids that reduce the insulation effect, and the insulation material is multilayered. , so there is no thermal short circuit at the butt joints between the insulation materials.
Furthermore, even if a crack occurs in the insulation material, it will remain in one layer, and there will be no cracks that propagate from the inside to the outside of the insulation layer, and it will not fall off due to vibration, etc., and its excellent insulation effect will be maintained for a long time. In addition, even if the stored fluid leaks from the inner tank, it will be prevented from leaking to the outside, and the fluid will not penetrate the insulation material and cause a decrease in the insulation effect, or even cool the outer tank. This method has the effect of making it possible to manufacture extremely safe low-temperature liquefied gas storage tanks, such as preventing the risk of destruction of the outer tank due to low-temperature embrittlement.

In addition, with this invention, it is possible to prefabricate the insulation wall, which makes quality control easier, and simplifies the work process and saves labor, which was previously impossible in this type of insulation construction. It becomes possible. It has many advantages in terms of heat insulation, economy, and ease of construction, including the ability to significantly reduce construction time and on-site costs.

BRIEF DESCRIPTION OF THE DRAWINGS: Fig. 1 is a partially cutaway perspective view of a heat insulating wall of a low-temperature liquefied gas storage tank showing one embodiment of the present invention, Fig. 2 is a vertical sectional view thereof, and Fig. 3 is a diagram showing another embodiment of the invention. FIG. 4 is a longitudinal sectional view of a heat insulating wall showing an example, and FIG. 4 is a longitudinal sectional view of a heat insulating wall when a backing member is used.

In the drawings, 1 is an outer tank, 2 is an inner wall surface of the outer tank, 3 is an inorganic compression-resistant shaped heat insulating material, 4 is a plate-shaped body, 5 is an inner tank, 7 is a support plate, 8 is a bolt, 10 is a pressurizing device, 11 is liner,
12 is a backing member, and 14 is a fixture.

Claims (1)

[Claims] 1. In the insulating wall of a low temperature liquefied gas storage tank consisting of an outer tank with a rigid structure, an insulating wall provided on the inner wall surface of the outer tank, and an inner tank with a thin film structure provided on the inner side, On the inner surface of the backing member disposed on the inner wall of the tank, inorganic compression-resistant shaped heat insulating material selected from calcium silicate heat insulating material and perlite heat insulating material and plate-shaped bodies are alternately arranged in multiple layers and are liquid-tight. A bolt is attached to the inner wall surface of the outer tank or the backing member and/or the plate-shaped body through the inorganic compression-resistant shaped heat insulating material and the plate-shaped body, and the inorganic compression-resistant A heat insulating wall for a low temperature liquefied gas storage tank, characterized in that a shaped heat insulating material is held in a compressed state, and the vicinity of the tip of a bolt is covered with a fluid-impermeable liner via the heat insulating material.