JP2754174B2 - Low temperature tanks such as LNG - Google Patents

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to an improvement in a low temperature tank such as LNG and a construction and installation method thereof.

[0002]

2. Description of the Related Art A low-temperature steel material constituting a low-temperature tank such as LNG and the like and a thermal stress of the low-temperature tank commonly used in the prior art will be described. Steel was used, and the coefficient of linear expansion of this steel material was large, and the thermal stress at -190 ° C. was higher than the allowable stress of the material. There is also an aluminum alloy steel material used, but this steel material also has a large linear expansion coefficient, and its thermal stress is higher than the material yield point at -190 ° C. In the case of an underground low-temperature tank, an inner tank with a SUS304 membrane stretched about 2 mm thick is used as an inner tank.
The thermal stress at 90 ° C. was also higher than the material yield point.

Conventionally, a ground-type double-shell low-temperature tank has been known as a tank for storing a low-temperature liquid such as LNG. This type of double-shell low-temperature tank has a structure in which the inner tank is not restricted, and the inner tank can freely shrink. (For example, Tokuhei 1-236
In such a double-shell low-temperature tank, the thickness of the steel used, particularly the knuckle ring thickness, increases with the diameter of the tank, so that the tank capacity that can be constructed is limited.

[0004] There is an underground low-temperature tank as a tank for storing a low-temperature liquid such as LNG. This type of tank constitutes an inner tank in which a corrugated membrane is stretched on the side and bottom of a concrete body buried underground and constructed through a cooling material such as rigid polyurethane foam (PUF). Are restrained from being displaced outside the side and bottom surfaces of the skeleton via anchors.
(See, for example, Japanese Patent Publication No. 62-46759) In such an underground low-temperature tank, it has been confirmed that the corrugation of the membrane is stable at low temperatures, even if it is opened due to heat shrinkage and internal pressure acts. Therefore, careful experiments and analyzes are required, and the stability of the deformation behavior and the fatigue strength of the membrane when the temperature and internal pressure fluctuate due to the operation such as receiving and receiving LNG are also examined in detail. Furthermore, since this kind of tank requires a cold insulating material having pressure resistance, it is uneconomical to increase the storage tank capacity.

It is an object of the present invention to form a continuous concave arc.
To provide a low temperature tank that can resist internal pressure due to membrane force
It is in.

[0006]

[Means for Solving the Problems ] To solve the above-mentioned problems.
Therefore, the low-temperature tank such as LNG of the present invention is as follows:
Adopt means.

[0007] The above object is achieved by using a concrete
Cooling material such as perlite on the inner wall of the outer tank that can resist pressure
Through a plurality of line or point anchors,
LNG, etc., which constitutes an inner tank with pressure resistance and airtightness
In the low temperature tank, the shape of the inner tank is
Achieved by the continuous shape of small concave arcs connecting
It is.

[0008]

[Function] Applicable to both underground and above-ground types.
The shape such as a rectangular solid is arbitrary. Outer tub directly resists external pressure
Also supports the internal pressure acting on the inner tank via the anchor
I do. Cooling means consists of perlite, etc., outer and inner tanks
In between Insulates but has a membrane-type rigid
Does not require internal pressure transmission function such as urethane foam
No. The inner tank made of Invar material is
Also resists internal pressure with membrane force or bending,
Can concentrate on power. Anchor inner tank shape
Internal pressure due to membrane force made of continuous small concave arcs connecting between
Can be resisted. Compared to a ground-based cryogenic tank
Since the sectional force generated in the inner tank is small, the plate thickness can be reduced,
The deformation behavior of the inner tank is lower than that of the underground low temperature tank.
Simpler, clearer and more stable.

[0009]

Next, the details of the embodiment of the present invention will be described with reference to the drawings.
explain. 1 is a cross-sectional plan view of a cubic-shaped low-temperature tank, FIG. 2 is a vertical sectional front view of FIG. 1, FIG. 3 is a cross-sectional plan view of a cylindrical low-temperature tank, and FIG. 5 is an enlarged cross-sectional view of a main part, FIG. 6 is a perspective view of a plate-like anchor, FIG. 7 is a vertical cross-sectional view of a main part obtained by adding a horizontal beam to an inner tank, and FIG. 8 is a cross-sectional plan view of FIG. .

A shown in FIG . 1 is a rectangular parallelepiped LNG or the like.
The low-temperature tank A is configured as follows.
Has been established. That is, the external pressure composed of concrete
Against the inner wall of the side of the outer tank 1 with a rectangular parallelepiped structure that can resist
Appropriate plate-like anchor 2a in vertical position so that the plate surfaces are orthogonal
Arranged at intervals and at the base of each plate-like anchor 2a.
To the frame side 1a of the outer tub 1. on the other hand,
FIG. 2 also shows the skeleton roof 1b and the skeleton bottom 1c of the outer tank 1.
So that the plate surface is horizontal so that the plate surface is orthogonal.
2b are arranged at appropriate intervals, and each plate-like anchor
2b, the base of which is restrained and disposed on the side 1a of the skeleton
Anchor 2a, skeleton roof 1b and skeleton bottom 1c.
A thin wall having a small linear expansion coefficient between the plate-like anchors 2b to be provided.
The inner tank 3 which has pressure resistance and airtightness
And has an internal pressure transmitting function between the inner tank 3 and the outer tank 1.
Not filled with chilled material 4 such as pearlite
Through the plate-like anchors 2a and 2b on the side 1a and the frame bottom 1c
To transmit the internal pressure load to the outer tank 1 by the membrane force of the inner tank 3, and
It is made to be able to resist. In addition, FIG.
As is clear from FIG.
2 a, obtained by a concave arc of a continuous shape connecting 2b, low
The hot tank A is configured as described above. In addition, this fruit
In this embodiment, the plate-like anchor 2
a in the vertical direction, this plate-like anchor 2a
Since the same action can be obtained even if
It is not specified in the configuration shown. Plate anchor 2
a and 2b are point support structures such as anchor bolts (not shown).
It can also be made. 5 is a support | pillar in a figure.

In the above-described embodiment, the low-temperature tank A has a cubic structure. However, as shown in FIG.
It may be used as the, or sometimes the low temperature tank C of the tunnel structure as shown in FIG. 4, since the detailed structure is the same as the embodiment, by giving the same symbols to the same components Detailed description is omitted.

FIG . 5 shows an enlarged cross section of a main part, and shows plate-like anchors 2a, 2a constituting the low-temperature tanks A, B, C.
As shown in FIG. 7, the cross-sectional shape is an arrow shape as shown in FIG. The internal pressure load applied to the inner tank 3 is supported by the plate surface.

FIG . 7 shows a structure in which horizontal beams 7 in a horizontal or vertical posture are added to the outer surface of the inner tank 3 at appropriate intervals to increase bending rigidity.

The present invention also provides a low-temperature tank A comprising a watertight outer tub 1 withstanding a towing load at a shipbuilding dock other than a tank construction site, and a cold insulator 4 and an inner tub 3 therein.
It is also possible to construct B and C and tow and install the low temperature tanks A, B and C whose side / bottom or the whole is completed in the tank construction area.

[0015]

According to the configuration of the present invention as described above,
The following effects can be obtained. (A) According to the configuration of the present invention, a type such as an above-ground type or an underground type
It can be applied to all low temperature tantalum without being bound by
The shape is arbitrary, such as cylindrical and rectangular parallelepiped.
The outer tank can directly resist external pressure,
To support the internal pressure load acting on the inner tank
Of course, (b) resists internal pressure load by membrane force or bending,
Can be concentrated, and therefore,
Cooling material without pressure transmission function can be used.
Total and easy to manufacture. (C) Since the sectional force generated in the inner tank is smaller than that of the conventional ground-type low-temperature tank, the inner tank plate can be made thinner, which is economical. (D) Compared with the conventional underground low-temperature tank, the deformation behavior of the inner tank is simpler, clearer and more stable than the membrane, so that the design and workability are good.

[Brief description of the drawings]

FIG. 1 is a cross-sectional plan view of a cubic low-temperature tank.

FIG. 2 is a vertical sectional front view of FIG.

FIG. 3 is a cross-sectional plan view of a cylindrical low-temperature tank.
You.

FIG. 4 is a longitudinal sectional front view of a tunnel type cryogenic tank.
is there.

FIG. 5 is an enlarged sectional view of a main part.

FIG. 6 is a perspective view of a plate anchor.

FIG. 7 is a longitudinal sectional view of a main part in which a horizontal beam is added to the inner tank.
You.

FIG. 8 is a cross-sectional plan view of FIG . 7;

[Explanation of symbols]

 Reference Signs List A low-temperature tank B low-temperature tank C low-temperature tank 1 outer tub 1a skeleton side 1b skeleton roof 1c skeleton bottom 2a plate-shaped anchor 2b plate-shaped anchor 3 inner tub 4 cold insulator 4a cold insulator 5 column 6 mountain-shaped inclined plate 7 Horizontal beam

Claims (1)

(57) [Claims] 1. An external pressure made of concrete.
On the inner wall of the outer tank through a cool insulator such as perlite.
Constrained by a number of line or point anchors,
Low-temperature tanks such as LNG with a dense inner tank
The inner tank shape should be small, connecting the anchors.
LNG, etc. characterized by a continuous concave arc shape
Low temperature tank.