JPS5829357Y2 - Low temperature liquefied gas storage tank - Google Patents

Description

[Detailed Description of the Invention] This invention relates to an improvement of a low-temperature liquefied gas storage tank for storing ultra-low-temperature liquefied gas under pressure close to atmospheric pressure.

Conventionally, this type of tank Z is an independent double tank consisting of an inner tank with a rigid structure that accommodates low-temperature liquefied gas, an outer tank that protects the heat insulating material in the form of powder such as pearlite. It consists of a shell tank, or a rigid outer tank, and a box-shaped body made of high-density foamed synthetic resin or plywood on the inside of this outer tank, and an insulation block filled with a powder-like insulation material such as perlite. a compression-resistant insulation layer;
Membrane type tanks are in practical use, which are comprised of an inner tank with a thin film structure for storing low-temperature liquefied gas provided inside the tank.

However, in any of the above methods, since the inner tank is in direct contact with the fluid in the low temperature range, it is necessary to have sufficient toughness in that temperature range. They are made from low-temperature metal materials such as nickel steel and aluminum alloy, but these metals are very expensive and require a high level of skill to apply blade pressure, which makes it difficult to manufacture low-temperature liquefied gas storage tanks. The drawback is that the cost increases significantly, and in addition, with the conventional insulation layer mentioned above, when storing low-temperature liquefied gas, the filled insulation material such as perlite gradually settles downward due to vibration etc., causing the insulation space to deteriorate. If there is a fatal defect such as a void forming above and loss of insulation effect, and the stored liquefied gas leaks from the inner tank, the liquefied gas may penetrate into the insulation layer and reduce the insulation effect, or the outer tank There is a danger that cooling the outer tank could lead to destruction of the outer tank due to low-temperature embrittlement.

The purpose of this invention is to eliminate all the drawbacks of the conventional low-temperature liquefied gas storage tanks mentioned above, and to provide a low-temperature liquefied gas storage tank that has extremely excellent insulation effects and is highly economical. It is.

Hereinafter, this 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, and is made of ordinary steel plates,
It is made of prestressed concrete.

On the inner wall surface 2 of the outer tank 1, a large number of heat-resistant units 3 are arranged vertically and horizontally to form a heat insulating wall.

The heat insulating unit 3 includes a compression-resistant shaped heat insulating material 4 and an adhesive layer 5 that fixes this to the inner wall surface 2 of the outer tank and covers the surface.
Containing liquefied gas impermeable surface liner 6, interlayer liner 7
The size of the tank is appropriately determined by taking into consideration the shape of the tank to be obtained, the temperature of the stored liquefied gas, the physical properties of the materials used, the construction conditions, etc.

The compression-resistant shaped heat insulating material 4 has particularly excellent compression resistance,
Calcium silicate insulation material and perlite insulation material, which are often used as high-temperature insulation materials, are used.

The heat insulating material 4 is bonded to the adhesive layer 5 and the surface liner 6, and is laminated in at least two layers, each layer being arranged in a plurality of layers, and the joints between the insulating materials are visible from the outside. They are arranged so that they do not extend linearly inward.

When forming a long insulation unit 3, as shown in the drawing, a plurality of insulation materials 4 are used, and the insulation materials 4 in each layer are
The joints are arranged so that they do not overlap each other and do not extend linearly from the outside to the inside, thereby lengthening the path of heat entering through the joints and reducing the amount of heat that enters. 4 Ru.

In addition, the seam is filled with an elastic heat insulating material 8 such as glass fiber polyethylene foam to prevent convection of gas existing within the seam and to reduce the intrusion of heat through the seam. 3 to act as a contraction adjustment joint for insulation 4 and liner 6.
Even if there is a difference in the coefficient of linear expansion between the liner 6 and the liner 6, it is possible to prevent the occurrence of harmful functional phenomena that would lead to destruction of the heat insulating material 4 or the liner 6, 7 due to the difference in the amount of shrinkage.

The adhesive layer 5 is formed by applying and solidifying a liquid composition of a non-foamed or foamed synthetic resin or elastomer that hardens at room temperature, such as epoxy resin, polyurethane resin, epoxy acrylate resin, urethane distomer, or silicone elastomer. In the layer, as shown in the drawing, welding is made to the outer tank inner wall surface 2 or a backing member 9 to be described later.
In the hook attached by embedding or other means, a sheet-like member 11 stretched along the inner wall surface 2 of the outer tank is embedded in the tool 10 and is supported through the hole portion, whereby the adhesive layer 5 The hook is reinforced with a sheet-like member supported by a tool to improve performance and prevent it from peeling off even when containing low-temperature liquefied gas.

Furthermore, even if it should peel off, the hook is integrated with the inner wall surface 2 of the outer tank via the tool 10, so the heat insulating unit 3 bonded to the adhesive layer 5 will not fall off.

As the sheet-like member 11, wire mesh, expanded metal lath, punched metal, nylon net, class cloth, roving cloth, etc. are used.

The surface liner 6 completely adhesively covers all exposed surfaces of the heat insulating material 4 except for the adhesive surface with the outer tank inner wall surface 2 or the backing member 9, and is integrally formed with the adhesive layer 5. .

The surface liner 6 is made of a thin material such as glass flakes, mica, or aluminum flakes, and a synthetic resin or elastomer that does not produce any by-products during curing, such as epoxy resin, polyurethane resin, unsaturated polyester resin, RTV silicone elastomer, or urethane resin. When the liner is formed into a single layer, it becomes a composite material in which the flaky material is oriented and dispersed in multiple layers.

That is, a liquid composition of the flake material and a binder is mixed in advance, and the mixture is applied to the exposed surface of the heat insulating material 4 by roller coating or spraying, and then smoothed with a roll, and then solidified. formed by

Alternatively, a liquid composition such as the synthetic resin or nidistomer is applied to the exposed surface of the heat insulating material 4, and then a liquefied gas impermeable film such as aluminum foil is stretched over it, and then the liquid composition is applied on top of it. A laminated liner is obtained by applying and curing it.

Alternatively, the surface liner 6 can be obtained by adhering the composite material or laminated material, which has been previously formed into a desired shape, to the exposed surface of the heat insulating material 4 using the liquid composition as an adhesive.

An interlayer liner 7 is provided on the laminated surface of the heat insulating material 4, and is formed using the same material and method as the surface liner 6.

The interlayer liner 7 has a surface liner 6 at its periphery.
It is connected to form an integrated structure.

Although the interlayer liner 7 is bonded to the heat insulating material 4, which makes the vehicle heavy, it may be bonded or non-bonded in the heat insulating unit 3 used at a horizontal portion such as the bottom inner wall surface of an outer tank.

The side shape of the heat insulating unit 3 is not particularly limited, and can have various shapes other than those shown in the drawings.

At a joint 12 between a large number of heat insulation units 3 provided on the inner wall surface 2 of the outer tank, the surface liners 6 of adjacent heat insulation units 3 are connected to each other via a joint liner 13. 12 is filled with an elastic heat insulating material such as glass fiber vane or polyethylene foam in a compressed state.

It is preferable that the joint liner 13 be curved in a shape that projects toward the inside of the tank, thereby reducing tensile stress generated by cooling when storing low-temperature liquefied gas and compressive stress due to the pressure of the stored liquefied gas. This is done to help prevent the joint liner itself from being destroyed.

The joint liner 13 is made of the same material as the surface liner 6 and is previously formed into a desired shape, and is adhered to the surface liner 6 using the liquid composition of the synthetic resin or nidistomer.

Alternatively, after filling the seam 12 with an elastic heat insulating material, as described in the method for forming the surface liner 6, a liquid composition of a thin piece material and a synthetic resin Al or an elastomer or a liquid composition thereof may be used. It is formed using aluminum foil or the like.

The shape of the joint liner 13 is not particularly limited, and various shapes other than this embodiment may be adopted.

On the other hand, the interlayer liners 7 of adjacent heat insulating units 30 are also connected to each other via joint liners 13' like the surface liners 6.

With this configuration, even if the stored liquefied gas leaks from the joint liner 13, it will not permeate the entire insulation material and cause the insulation effect to be lost. This prevents the risk of rapid cooling and destruction.

As a means for adhering and holding the heat insulating unit to the inner wall surface of the outer tank, as shown in FIGS. 3 and 4, hooks 10 are provided on a backing member 9 of an appropriate shape made of plywood, plastic plate, metal plate, etc. , a heat insulating unit with a backing member, in which a sheet-like member 11 is mounted and an appropriate number of heat insulating units 3 bonded and held by an adhesive layer 5, or a heat insulating unit panel 14 consisting of a plurality of heat insulating units 3 on a backing member 9. Attach the insulation unit panel with the backing member, which is adhered and held in the same manner as above, using bolts or other metal fittings (not shown).
It can be attached to the inner wall surface of the outer tank using a heat insulating wall.

In this case, a joint liner 13゜13' similar to that described above may be provided at the joint 12 between the heat insulating units 3 and filled with an elastic heat insulating material before attachment to the inner wall surface of the outer tank. Alternatively, after being attached to the inner wall surface 2 of the outer tank, the joint portion 12 may be provided with a joint liner 13, 13' and filled with an elastic heat insulating material.

The ridge of the heat insulating unit 3 is formed into a rounded shape as shown in the drawing, thereby preventing abnormal stress from being generated in a part of the corner of the liner when storing low temperature liquefied gas, This is to prevent the liner from breaking.

As described above, the low-temperature liquefied gas storage tank according to this invention has a robust structure, excellent heat insulation effect, and excellent economic efficiency and practicality.

That is, in this invention, the compression-resistant shaped heat insulating material 3
Since the gas-impermeable surface liner 6 surrounding the liquefied gas also serves as the wall of the liquefied gas storage tank, not only can the liquefied gas storage inner tank be omitted, but also the calcium silicate heat insulating material can be used as the insulation material. You can use wood or perlite insulation material.

Also, can it be packaged with the liner 6? The J thermal material 3 is used as a heat insulating unit, and the heat insulating units arranged vertically and horizontally are connected in a liquid-tight manner by a gas-impermeable joint liner 13, so that the heat insulating material 3 is isolated from liquefied gas. This provides high watertightness against liquefied gas.

Moreover, the internal pressure caused by the liquefied gas can be supported by the entire compression-resistant shaped heat insulating material 3 covered with the liner 6, so that a robust tank can be constructed.

In addition, the compression-resistant shaped heat insulating material 3 is laminated in at least two layers, and the interlayer liner 7 is provided between them, so that even if liquefied gas leaks from the surface liner 6, the liquefied gas will be diffused. One q stays only inside the insulation unit, and the interlayer liner 7 prevents it from diffusing to the second layer of insulation, so the advantage is that the deterioration of the insulation performance of the insulation wall due to leaked liquefied gas is kept to a minimum. Also, any leaking liquefied gas remains within the sealed insulated unit, so there is no danger of it leaking outside the insulated walls.

In addition, since the joints between the compression-resistant shaped heat insulating materials 4 are formed so that they do not extend linearly from the outside to the inside, heat dissipation at the joints can be reliably prevented.

In addition, if the insulation unit is sealed, when the liquefied gas is contained and the insulation unit is cooled, the air inside the insulation unit contracts and the inside is maintained at a reduced pressure.
The insulation properties of the insulation unit can be improved.

In constructing the tank, the inner wall of the liquefied gas inner tank is formed by interconnecting the surface liners 6 of the insulation units arranged vertically and horizontally with liquefied gas impermeable joint liners 13. Therefore, the construction of the inner tank can be done easily and in a short time.

Furthermore, since the heat insulating material is attached to the outer tank and the surface liner, there is no fear that it will be worn away by vibration or the like, or that voids will be formed due to settling, resulting in a decrease in the heat insulating effect.

In addition, with this idea, it is possible to prefabricate the insulation walls, which makes quality control easier, and also simplifies and saves labor in the manufacturing process of low-temperature liquefied gas storage tanks, reducing construction time and costs. It has many advantages such as being able to significantly reduce the amount, and has extremely high industrial utility value.

[Brief explanation of the drawing]

Fig. 1 is a sectional view of a heat insulating wall portion of a low temperature liquefied gas storage tank showing one embodiment of this invention, Fig. 2 is a sectional view showing another embodiment, and Fig. 3 is a sectional view showing still another embodiment. Figure, 4th
The figure is a partially cutaway perspective view of a heat insulating unit panel consisting of a heat insulating unit made of three layers of compression-resistant shaped heat insulating materials laminated. In the drawings, 1 is an outer tank, 3 is a heat insulating unit, 4 is a compressible shaped heat insulating material, 5 is an adhesive layer, 6 is a surface liner, 7 is an interlayer liner, 9 is a backing member, 10 is a hanging bolt, 11 is a In the sheet-like member, 12 is a joint between the heat insulation units, 13 is a joint liner, and 14 is a heat insulation unit panel.

Claims (1)

[Scope of utility model registration request] It consists of an outer tank with a rigid structure and a heat insulating wall provided on the inner wall surface of the outer tank, and the heat insulating wall is a hook provided on the inner wall surface of the outer tank or a backing member arranged on the inner surface of the outer tank. an adhesive layer formed in such a manner that a sheet-like member is interlocked and supported by a latching tool provided on the holder and embedded therein; and a containing liquefied gas-impermeable surface liner that is adhered and held to the adhesive layer to form an integral structure. The space formed between is filled with a compression-resistant shaped heat insulating material such as a calcium silicate heat insulating material or a perlite heat insulating material in a laminated state in at least two layers, and each layer is arranged in a plurality of layers. , and the insulation materials are arranged so that the joints between them do not extend linearly from the outside to the inside, and the insulation material is adhered to the adhesive layer and the surface liner, and the insulation material is adhered to the laminated surface of the insulation material. and at least one layer of the surface liner and the interlayer liner of the adjacent heat insulation unit are composed of a plurality of insulation units each having an interlayer liner connected to the surface liner at the peripheral edge thereof, and the surface liner and at least one layer of the interlayer liner of the adjacent insulation unit are non-containing liquefied gas. 1. A low-temperature liquefied gas storage tank, characterized in that the tanks are interconnected by a permeable joint liner and that gaps between adjacent insulation units are filled with an elastic insulation material.