JPH1163393A - Large capacity storage low temperature liquefied gas tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To enlarge the capacity of a low temperature liquefied gas tank without causing a sudden sharp rise in building cost or needing large site area. SOLUTION: A plurality of tank bodies 13, 14 are arranged in proximity in a single breakwater 11. The bottom parts of storage spaces 15, 16 of the tank bodies 13, 14 are communicated with each other by a liquid communicating pipe 17, and the top parts of the spaces spaces 15, 16 are communicated with each other by a gas communicating pipe 18. In this way, the storage spaces 15, 16 can be handled substantially as one storage space, and only one set of auxiliary equipment such as a liquid receiving pipe 8, a liquid delivery pipe 9 and a gas delivery pipe 10 can be installed at either one of the tank bodies 13, 14, and necessary site area can be reduced since the tank bodies 13, 14 are arranged in proximity inside a single breakwater 11.

Description

DETAILED DESCRIPTION OF THE INVENTION

[0001]

The present invention relates to a large-capacity storage low-temperature liquefied gas tank.

[0002]

2. Description of the Related Art FIG. 4 schematically shows an example of a conventional large-capacity storage low-temperature liquefied gas tank (hereinafter simply referred to as a low-temperature liquefied gas tank). In FIG. 4, reference numeral 1 denotes a double tank comprising an outer tank 1a and an inner tank 1b. A low-temperature liquefied gas tank having a shell structure is shown. The low-temperature liquefied gas tank 1 is installed on a base slab 4 supported on a stilt floor via support legs 3 on the ground surface 2,
A space between the outer tub 1a and the inner tub 1b is filled with a cooling material such as pearlite so as to provide heat insulation inside and outside the tank.

Here, the reason why the foundation slab 4 is supported on a raised floor is to suppress the conduction of cold heat to the ground surface 2 as much as possible to prevent the ground surface 2 from freezing. 2 freezes, moisture in the ground freezes and expands, causing irregularities on the base surface, and the low-temperature liquefied gas tank 1
This causes problems such as inclination.

[0004] The inner tank 1b is placed on the base slab 4 via a bottom insulating layer 5 so as to be heat-shrinkable, and has a storage therein for storing a low-temperature liquefied gas 6 such as LNG. A space 7 is formed.

[0005] Further, a liquid receiving pipe 8 for introducing the low-temperature liquefied gas 6 into the storage space 7 is branched and provided through the lower part of the body of the low-temperature liquefied gas tank 1 and the upper part of the roof, respectively. The low-temperature liquefied gas 6 can be selectively introduced from either the bottom or the ceiling of the storage space 7 according to the properties of the newly introduced low-temperature liquefied gas 6. The separation phenomenon caused by the specific gravity difference of No. 6 does not occur.

[0006] A liquid discharge pipe 9 for discharging the low-temperature liquefied gas 6 from the bottom of the storage space 7 is also provided through the lower part of the body of the low-temperature liquefied gas tank 1. The gas discharge pipe 10 which discharges the vaporized gas 6x generated by the natural heat input from the outside is also provided to penetrate.

Further, around the low temperature liquefied gas tank 1,
If a large-scale earthquake occurs, even if the low-temperature liquefied gas tank 1 is damaged and the low-temperature liquefied gas 6 leaks, secondary disasters such as contamination of the surrounding environment can be prevented. A dike 11 is provided.

In recent years, the required capacity of such a low-temperature liquefied gas tank 1 has been increasing, and the size of the body of the low-temperature liquefied gas tank 1 in the radial direction has been increased, or the height has been increased upward. Low temperature liquefied gas tank 1
To be larger.

[0009]

However, when expanding the radial dimension of the body of the low-temperature liquefied gas tank 1,
Since the weight of the roof increases as the radial dimension of the trunk increases, the load on the upper end of the trunk supporting the outer peripheral edge of the roof significantly increases, and the upper end of the trunk increases. When the thickness of the low-temperature liquefied gas tank 1 has to be greatly increased and the height of the low-temperature liquefied gas tank 1 is to be increased, the longer the height is, the longer the inner dimension of the body of the low-temperature liquefied gas tank 1 is. The thickness of each side plate must be increased so that the side plates of the outer tank 1b and the outer tank 1a do not buckle.
The thickness of the side plates cannot be increased indefinitely, and even if these thicknesses are increased, there are naturally structural limitations.

Therefore, in order to store a large-capacity low-temperature liquefied gas 6 that exceeds the structural limit of the low-temperature liquefied gas tank 1 per unit, it is necessary to increase the number of low-temperature liquefied gas tanks 1 to increase the number of low-temperature liquefied gas tanks 1. Therefore, there is a problem that a large increase in construction cost is unavoidable, and since the individual low-temperature liquefied gas tanks 1 are surrounded by the dike 11, a vast site area is required. There was also a problem that land prices soared.

The present invention has been made in view of the above-mentioned circumstances, and aims to increase the capacity of a low-temperature liquefied gas tank without causing a large rise in construction costs or requiring a large site area. The purpose is.

[0012]

According to the present invention, a plurality of tank bodies are arranged close to each other in a single dike, and the bottoms of storage spaces of the tank bodies are communicated with each other by a liquid communication pipe. The present invention relates to a large-capacity storage low-temperature liquefied gas tank, characterized in that ceiling portions of storage spaces of a main body are communicated with each other by a gas communication pipe.

With this configuration, the low-temperature liquefied gas stored in the storage space of each tank main body always changes at the same level, so that the storage space of each tank main body can be treated as substantially one storage space. It is possible to install auxiliary equipment such as liquid receiving pipe, liquid discharging pipe, gas discharging pipe, etc. for at least one of each tank body,
In addition, since the tank bodies are arranged close to each other in a single dike, the required site area can be reduced.

Further, in the present invention, it is preferable that each tank main body is erected on a common foundation, so that the relative displacement between the tank main bodies at the time of an earthquake is reduced, and It is possible to reduce the stress acting on the communication pipe and the gas communication pipe.

[0015]

Embodiments of the present invention will be described below with reference to the drawings.

FIGS. 1 to 3 show an example of an embodiment of the present invention, in which parts denoted by the same reference numerals as those in FIG. 4 represent the same or functionally substantially the same. ing.

In the low-temperature liquefied gas tank 12 of this embodiment, a pair of tank bodies 13, 1
4 are arranged in close proximity, and both tank bodies 13 and 14
It is installed on a common foundation slab 4 (foundation) that is supported on a ground floor 2 via support legs 3 in a raised floor manner.

The two tank bodies 13 and 14 have outer tanks 13a and 13 in substantially the same manner as the conventional low-temperature liquefied gas tank 1 (see FIG. 4).
4a and an inner tank 13b, 14b, and has a double shell structure.
The space between the tank 14a and the inner tanks 13b and 14b is filled with a cooling material such as pearlite so as to provide heat insulation inside and outside the tank.

The inner tanks 13 of the two tank bodies 13, 14
The bottoms of storage spaces 15 and 16 formed in b and 14b are communicated with each other by a liquid communication pipe 17 extending in the horizontal direction, and the gas communication pipes in which the ceilings of storage spaces 15 and 16 extend in the horizontal direction. 18 communicates.

As shown in FIG. 2, both ends of the liquid communication pipe 17 in the longitudinal direction are connected to the outer tank 1 in each of the tank bodies 13 and 14.
3a, 14a slidably penetrate the side plates, and the inner tub 13b,
14b is welded through to the side plate, and a bellows-type expansion / contraction part 19 is formed in the middle part in the longitudinal direction to form the inner tank 13b,
14b Horizontal displacement due to mutual thermal shrinkage and liquid communication pipe 1
The heat expansion and contraction of 7 itself can be allowed.

Further, at an appropriate position in the longitudinal direction of the liquid communication pipe 17, an on-off valve 20 which can be remotely operated so as to close the flow path as required is provided. A heat insulating material 21 is attached to an outer peripheral portion of the heat sink so as to maintain a low temperature liquefied gas flowing through the inside at a low temperature.

Further, both ends of the gas communication pipe 18 in the longitudinal direction are bent downward to form elbow portions 22 for allowing thermal expansion and contraction of the gas communication pipe 18 itself. Outer tub 13 in each tank body 13, 14
a and 14a are slidably penetrated vertically and slidably penetrated to the roof plates of the inner tubs 13b and 14b, respectively, so that the inner tubs 13b and 14b can be displaced in the vertical direction due to thermal contraction. I have to get it.

Further, at an appropriate position in the longitudinal direction of the gas communication pipe 18, an on-off valve 23 which can be remotely operated so as to close the flow path if necessary is provided.

When it is difficult to allow the gas communication tube 18 itself to expand and contract by heat only with the elbow portion 22, a loop portion 24 may be separately formed as shown in FIG.

Further, in this embodiment, one of the tank bodies 1
Liquid receiving pipes 8 for introducing the low-temperature liquefied gas 6 into the storage space 15 are branched and provided through the lower part of the body and the upper part of the roof of the storage space 15, respectively. The low-temperature liquefied gas 6 can be selectively introduced from either the bottom or the ceiling of the storage space 15 according to the properties of the storage space 6. A liquid discharge pipe 9 for discharging the low-temperature liquefied gas 6 is provided through the bottom of the tank, and a gas discharge for discharging the vaporized gas 6x generated by natural heat input from the outside is provided above the roof of the other tank body 14. A tube 10 is provided through.

If the low-temperature liquefied gas tank 12 is configured as described above, the storage spaces 15, 16 of the tank bodies 13, 14 are formed.
Since the low-temperature liquefied gas stored in the tank always changes at the same level, the storage spaces 15, 16 of both tank bodies 13, 14 are kept.
Can be treated as substantially one storage space, and the liquid receiving pipe 8 is installed in one of the tank bodies 13 and 14, and the liquid discharging pipe 9 and the gas discharging pipe 10 are connected to the other. For example, only one set of auxiliary equipment required for a normal low-temperature liquefied gas tank needs to be installed. In addition, since both tank bodies 13 and 14 are arranged close to each other in a single dike 11 The required site area is small.

Further, in this embodiment, in particular, since both tank bodies 13 and 14 are erected on the common foundation slab 4, the relative displacement between the two tank bodies 13 and 14 is reduced when an earthquake occurs. Thus, the stress acting on the liquid communication pipe 17 and the gas communication pipe 18 can be reduced.

Therefore, according to the above embodiment, the storage spaces 15 and 16 of both tank bodies 13 and 14 disposed close to each other in the single dike 11 can be treated as substantially one storage space. For example, a liquid receiving pipe 8 is provided for one of the tank bodies 13 and 14, and a liquid discharging pipe 9 and a gas discharging pipe 10 are provided for the other.
Only one set of auxiliary equipment required for ordinary low-temperature liquefied gas tanks needs to be installed, and the required site area is small, leading to a significant rise in construction costs,
The capacity of the low-temperature liquefied gas tank 12 can be increased without requiring a large site area.

Further, as shown in this embodiment, if the two tank bodies 13 and 14 are erected on the common foundation slab 4, the relative displacement between the two tank bodies 13 and 14 during the occurrence of an earthquake can be reduced. As a result, the stress acting on the liquid communication pipe 17 and the gas communication pipe 18 can be reduced, and the security in the event of an earthquake can be greatly improved.

The large-capacity storage low-temperature liquefied gas tank of the present invention is not limited to the above-described embodiment, and three or more tank bodies may be arranged close to each other. It is not limited to a type supported on a raised floor via support legs above, that the tank body does not necessarily have to have a double shell structure, and other various changes are made without departing from the gist of the present invention. Obviously you can get it.

[0031]

According to the large-capacity storage low-temperature liquefied gas tank of the present invention described above, the following various excellent effects can be obtained.

(I) According to the first aspect of the present invention, the storage space of each tank main body disposed in proximity to a single dike can be treated as substantially one storage space, Since it is only necessary to install auxiliary equipment such as a liquid receiving pipe, a liquid discharging pipe, a gas discharging pipe, etc. for at least one of the tank bodies, a significant increase in construction cost is required, or a large site area is required. Without increasing the capacity, the capacity of the low-temperature liquefied gas tank can be increased.

(II) According to the second aspect of the present invention, when an earthquake occurs, the relative displacement between the tank bodies is reduced to reduce the stress acting on the liquid communication pipe and the gas communication pipe. Can greatly improve security in the event of an earthquake.

[Brief description of the drawings]

FIG. 1 is a cross-sectional view illustrating an example of an embodiment of the present invention.

FIG. 2 is a sectional view showing details of a liquid communication pipe of FIG. 1;

FIG. 3 is a view showing an example in which a loop portion is formed in the gas communication pipe of FIG.

FIG. 4 is a sectional view showing a conventional example.

[Explanation of symbols]

 Reference Signs List 4 foundation slab (foundation) 11 breakwater 12 low temperature liquefied gas tank 13 tank body 14 tank body 15 storage space 16 storage space 17 liquid communication pipe 18 gas communication pipe

Claims (2)

[Claims] 1. A plurality of tank bodies are arranged close to each other within a single liquid barrier, the bottoms of the storage spaces of the tank bodies communicate with each other by liquid communication pipes, and the ceilings of the storage spaces of both tank bodies are connected to each other. A large-capacity storage low-temperature liquefied gas tank, characterized by communicating with a gas communication pipe. 2. The large-capacity storage low-temperature liquefied gas tank according to claim 1, wherein each tank body is erected on a common foundation.