JPH07167393A - Flat bottom cylindrical medium-pressure low-temperature tank - Google Patents

Abstract

PURPOSE:T heighten follow-up performance to the contraction of an inner tank by providing plural vertical fibers fastened to an anchor metal member with the lower end embedded in floor slab concrete, and cold insulating powder material filled between the fibers. CONSTITUTION:Inner tank roof lifting force is transmitted to an outer tank floor slab concrete 4B via an inner tank side plate 2, a skirt, fibers 9 and an anchor metal member 8. Cold insulating powder is filled around the fibers 9 piercing pits piercingly provided at equal spaces at the inner tank floor slab concrete 4A. The inner tank side plate 2 and the inner tank bottom plate 3 are connected to each other by an annular corner curved plate so as to form a space for fitting the fibers 9 while avoiding the stress concentration of an inner tank. Plural fibers 9 are extended vertically at equal spaces through the pits, and the skirt is coaxially set to the floor slab concrete 4A so that the centerline of a lower end flange coincides with the centerline of the pit. Penetrting heat is thereby reduced, and follow-up performance to the contraction of the inner tank can be heightened.

Description

Detailed Description of the Invention

[0001]

BACKGROUND OF THE INVENTION 1. Field of the Invention The present invention relates to a flat-bottomed cylindrical medium-pressure cryogenic tank used for storing LNG, LPG, liquid hydrogen and the like.

[0002]

2. Description of the Related Art In a flat-bottomed cylinder type low-pressure low-temperature tank for storing LNG, LPG, liquid hydrogen, etc., conventionally, as shown in the longitudinal sectional view of FIG. It is adapted to be transmitted to the concrete floor board concrete 04 via the inner tank anchor strap 03. Here, the anchor straps 03 are arranged at a pitch of about 1 m, as shown in the enlarged view of FIG.

[0003]

Conventionally, this type of flat-bottomed cylindrical low-temperature tank has an internal pressure of 0.2 kg / cm ² g or less.
Anchor straps supporting the gas pressure on the inner tank roof had to be installed every 1 m. Therefore, when the tank becomes cold and contracts in the radial direction, the flexibility of the anchor strap can follow the tank. Also, since the cross-sectional area of the anchor strap is not so large, the heat entering from the anchor strap did not pose a problem. However, when vacuum cooling is required as in the case of liquid hydrogen storage, it is necessary to consider atmospheric pressure as the internal tank gas pressure, so it is necessary to consider about 1.2 kg / cm ² . In the conventional structure, the inner tank anchor that bears this pressure is not satisfied in terms of followability to inner tank contraction and invasion heat.
That is, in the flat-bottomed cylindrical medium-pressure low-temperature tank, it is necessary to newly adopt an inner tank anchor structure having a followability to the inner tank shrinkage and a low penetration heat.

The present invention has been proposed in view of the above circumstances, and it requires vacuum cooling such as liquid hydrogen storage, can withstand a relatively large internal pressure, reduces the heat of intrusion, and has an internal tank. An object of the present invention is to provide a safe and economical flat-bottomed cylindrical medium-pressure low-temperature tank with improved followability to shrinkage.

[0005]

To this end, the present invention provides an inner tank in which a lower end and an upper end of a vertical cylindrical side plate having a relatively small diameter are closed by a horizontal circular bottom plate and an upper convex hemispherical shell-shaped top plate, respectively. The inner tank is coaxially enclosed with appropriate radial and vertical intervals, and the lower and upper ends of the relatively large-diameter vertical cylindrical side plates are closed by horizontal circular bottom plates and upward convex hemispherical shell-shaped top plates, respectively. In a vacuum cold-reservoir type tank having a double cylindrical structure consisting of an outer tank, the upper and lower ends are coaxially smoothly welded between the lower end of the inner tank side plate and the outer periphery of the inner tank bottom plate, and have a quarter arc cross section. An annular corner plate, a short cylindrical skirt that supports the lower end portion of the inner tank side plate on the floor plate concrete on which the inner tank is mounted, and the lower end is erected at equal intervals along the lower end flange of the skirt and the lower end is the outer tank. Anchor embedded in concrete A plurality of vertical fibers secured in hardware, characterized in that comprises the filled powder cold insulating material therebetween the plurality of fibers.

[0006]

With this structure, the upward gas pressure applied to the roof of the inner tank is transmitted to the concrete of the foundation floor plate through the side plates of the inner tank, the skirt, the fibers and the anchor metal. Here, since the tensile strength of the fiber is larger than that of the metal, the cross-sectional area is smaller than that of the metal. In addition, the conventional anchor strap has a single row, whereas the fibers are provided with a plurality of rows and the difference in the physical properties of the materials makes the fibers less rigid, and the followability to shrinkage of the inner tank is improved. Since the powder cold insulating material is filled around the fibers, the cold insulating property around the fibers does not change even if the fibers move due to the contraction of the inner tank.

[0007]

DESCRIPTION OF THE PREFERRED EMBODIMENTS Referring to the drawings, an embodiment in which the present invention is applied to the storage of liquid hydrogen will be described with reference to FIG.
2 is an enlarged view showing the inner tank anchor structure which is the II part of FIG. 1, and FIG. 3 is a partial plan view showing various examples of the pits of FIG.

In the above figure, the same reference numerals as those in FIGS. 4 to 5 indicate the same members as those in the figures, and it is confirmed that the space between the inner tank 1 and the outer tank 11, that is, the inner and outer tank space 12 is a vacuum. Considering this, the gas pressure in the inner tank will be about 1.2 kg / cm ² or more. Inner tank roof lifting force inner tank side plate 2 by the pressure, the skirt 7, fiber 9 via the anchor hardware 8 is transmitted to the outer tub floor concrete 4 _B.

[0009] Here, the periphery of the fibers 9 extending through the pit 14 that is transmural set at equal intervals in the inner tub floor concrete 4 _A filling powder cold insulating material 10. The inner tank side plate 2 and the inner tank bottom plate 3 are connected by an annular corner curved plate 6, so that stress concentration in the inner tank can be avoided and a space for mounting the fibers 9 can be provided.
Fiber 9 is not limited to fiber or twisted fiber, and FR
P-bolts are also conceivable.

Here, the fiber 9 is the inner tank floorboard concrete 4
_The pits 14 extend in the vertical direction at equal intervals through the pits 14 formed on the outer periphery of the _A , and the pits 14 have a concentric annular groove shown in FIG. 3A, a circular hole shown in FIG. There are rectangular holes and the like shown in FIGS. (C) and (D), and the skirt is coaxial with the inner tank floor concrete 4 _A so that the center line of the lower end flange 13 of the skirt 7 is aligned with the center line. Set. In any case, the inner peripheral end of the flange 13, the outer peripheral edge are both supported on the floor plate concrete 4 _A, the resultant force of the fibers 9 acts coaxially to the skirt 7.
A powder cold insulator 10 is filled around the fibers 9. The inner tank outer plate 2 and the inner tank bottom plate 3 are coaxially and smoothly welded to each other by a corner curved plate 6 having an annular 1/4 arc sectional view.

[0011]

According to such a structure, the following effects can be obtained. (1) Fill a flat-bottomed cylindrical low-temperature tank at 1 kg / cm ² or more. (2) The inner tank is supported strongly on the concrete of the inner tank floor plate while being capable of expanding and contracting sufficiently in the radial direction. (3) A large-capacity tank can be constructed for liquid hydrogen storage that requires vacuum cooling. (4) In the storage of LPG, LNG, etc., a low-pressure low-temperature tank that is kept at normal pressure has been generally used in the past, but a medium-pressure low-temperature tank with good operability is possible.

In short, according to the present invention, the inner tank formed by closing the lower end and the upper end of the vertical cylindrical side plate having a relatively small diameter with the horizontal circular bottom plate and the upper convex hemispherical shell top plate, respectively, and the inner tank having an appropriate radius. From the outer tank, which has a relatively large-diameter vertical cylindrical side plate with a horizontal circular bottom plate and an upper convex hemispherical shell-shaped top plate that respectively close the lower and upper ends of the cylindrical cylindrical side plate with a relatively large diameter. In a vacuum cold-reservoir type tank having a double cylindrical structure, an annular corner plate having upper and lower ends coaxially and smoothly welded between the lower end of the inner tank side plate and the outer circumference of the inner tank bottom plate and having a quarter arc section, A short cylindrical skirt that supports the lower end of the inner tank side plate on the floorboard concrete on which the inner tank is mounted, and a floorboard concrete on which the lower end is vertically suspended at equal intervals along the lower end flange of the skirt and on which the outer tank is mounted. Anchor embedded in metal Since it has a plurality of vertically oriented fibers and a powder cold insulation material filled between the above plurality of fibers, it needs to be vacuum-insulated, like liquid hydrogen storage, and can be used for relatively large internal pressure. INDUSTRIAL APPLICABILITY The present invention is extremely useful industrially, since a safe and economical flat-bottomed cylindrical medium-pressure low-temperature tank having improved endurance and less invasion heat and improved followability to inner tank shrinkage is obtained.

[Brief description of drawings]

FIG. 1 is an overall vertical cross-sectional view of a tank showing an embodiment of the present invention.

FIG. 2 is an enlarged view showing an inner tank anchor structure which is a II part of FIG.

FIG. 3 is a plan view showing various examples of the inner tank anchor structure of FIG. 2.

FIG. 4 is an overall vertical cross-sectional view showing a conventional flat-bottomed cylindrical cryogenic tank for storing liquid hydrogen.

5 is an enlarged view showing an inner tank anchor structure which is a V portion of FIG. 4. FIG.

[Explanation of symbols]

1 Inner tank 2 Inner tank side plate 3 Inner tank bottom plate 4 _A Inner tank floor plate concrete 4 _B Outer tank floor plate concrete 6 Annular corner curved plate 7 Skirt 8 Anchor hardware 9 Fiber 10 Powder cooling material 11 Outer tank 11 _A Outer tank side plate 11 _B Outside Tank bottom plate 12 Inner / outer tank space (vacuum space) 13 Flange 14 Pit

Claims (1)

[Claims] 1. An inner tank formed by closing a lower end and an upper end of a vertical cylindrical side plate having a relatively small diameter with a horizontal circular bottom plate and an upper convex hemispherical shell-shaped top plate, and the inner tank in a radial direction and a vertical direction as appropriate. Double cylindrical structure consisting of a vertical cylindrical side plate of a relatively large diameter, which is coaxially enclosed at intervals and has an outer tank in which the lower end and upper end are closed by a horizontal circular bottom plate and an upper convex hemispherical shell top plate, respectively. In the vacuum cold-reservoir type tank, the upper and lower ends of the inner tank side plate are coaxially smoothly welded between the lower end of the inner tank side plate and the outer periphery of the inner tank bottom plate, and an annular corner plate having a quarter-arc section is provided. A short cylindrical skirt that supports the lower end on the floorboard concrete on which the inner tank is placed, and an anchor that is hung vertically along the lower end flange of the skirt and has lower ends embedded in the floorboard concrete on which the outer tank is placed. Multiple vertical fibers attached to a hardware A flat-bottomed cylindrical medium-pressure cryogenic tank, comprising: a powder cold insulating material filled between the plurality of fibers;