JP4809710B2 - Low temperature liquefied gas storage facility - Google Patents

Description

  The present invention provides a lower roof material and a cylindrical inner peripheral wall constituting the lower surface side of the dome roof on the inner side of an outer tub provided integrally with an upper roof material and a cylindrical outer peripheral wall constituting the upper surface side of the dome roof. Is provided with an inner tank, and a heat insulating layer is provided between the outer tank and the inner tank, and the inner side of the inner tank is formed as a low-temperature liquefied gas storage section, and the outer tank and the heat insulation are formed. A cylinder that penetrates between the layer and the inner tub is fixed to the inner tub side, and is flexible and stretchable to surround a cylindrical portion that protrudes outward from the outer tub of the cylinder. Provided with a cylindrical cover, the cylindrical body is fixed to the outer tub side via the cylindrical cover, and a cylindrical heat insulating layer is provided between the cylindrical cover and the cylindrical body. The present invention relates to a low temperature liquefied gas storage facility.

The low-temperature liquefied gas storage facility has a heat insulation layer between the outer tank and the inner tank, and the inside of the inner tank is formed as a low-temperature liquefied gas storage section. Low temperature liquefaction occurs because the outer and inner tanks repeat relative displacement due to thermal shrinkage caused by temperature changes that occur when liquefied gas is introduced, and thermal shrinkage and expansion caused by various temperature changes that occur thereafter. Pipes for taking in and out of gas, and a sheath tube for a sensor for monitoring the reservoir, simply pass through the outer tank, the heat insulating layer, and the inner tank to the inner tank side and the outer tank side. If it is integrally fixed to both, there is a problem that stress is easily concentrated and damaged at the fixing portion between the cylindrical body and the inner tub side and the fixing portion between the cylindrical body and the outer tub side.
For this reason, while fixing the cylinder body to the inner tank side, when fixing the cylinder body to the outer tank side, it is mounted to insulate the cylinder portion protruding outward from the outer tank of the cylinder body This cylindrical cover is made up of a cylindrical cover having flexibility and stretchability, such as a bellows tube and a flexible tube, using a cylindrical cover surrounding the cylindrical heat insulating layer. By fixing the cylinder to the outer tank side through the cover, even if the cylinder fixed to the inner tank relative to the outer tank is displaced relative to the outer tank, Although the relative displacement can be absorbed by deformation of the cylindrical cover, it is provided so that the stress generated at the fixed part between the cylindrical body and the inner tank side and the fixed part between the cylindrical body and the outer tank side can be relieved. Conventionally, the entire tubular heat insulating layer has been formed so that the tubular portion can be insulated while allowing deformation of the tubular cover. Following the deformation of the cylindrical cover such as glass wool cotton filled it is constituted by deformable insulation material between the tubular body (well known conventional techniques can not disclose prior art document information).

However, in the long term, a lump of heat-insulating material such as glass wool cotton is repeatedly compressed and decompressed with repeated deformation of the cylindrical cover and its return deformation. There is a drawback that the degree of filling of the heat insulating material in the inside of the cover is uneven, and the heat insulating performance at a place where the degree of filling of the heat insulating material is small is likely to deteriorate.
The present invention has been made in view of the above circumstances, and ensures the heat insulating performance of the cylindrical heat insulating layer that insulates the cylindrical portion over a long period of time regardless of the deformation of the cylindrical cover and the repeated deformation thereof. The purpose is to make it easier.

The first characteristic configuration of the present invention is a lower roof material constituting the lower surface side of the dome roof, on the inner side of the outer tub provided integrally with an upper roof material constituting the upper surface side of the dome roof and a cylindrical outer peripheral wall. While providing an inner tank integrally provided with a cylindrical inner peripheral wall, providing a heat insulating layer between the outer tank and the inner tank, forming the inner side of the inner tank in a low-temperature liquefied gas reservoir, A cylindrical body that penetrates through the outer tub, the heat insulating layer, and the inner tub is fixed to the inner tub side, and a cylindrical portion that protrudes outward from the outer tub of the cylindrical body is surrounded. A cylindrical cover having flexibility and stretchability is provided, the cylindrical body is fixed to the outer tub side via the cylindrical cover, and a cylinder is provided between the cylindrical cover and the cylindrical body. A low-temperature liquefied gas storage facility provided with a body heat insulation layer, wherein the tubular heat insulation layer is fixed to the tubular body side; Constituted by an outer thermal insulating layer between the cylindrical cover and the heat insulation layer, the outer insulation layer, constituted by filling the tubular cover follow to deformable insulation material deformation of the outer insulation Between the lower end of the layer and the inner tank, a support heat insulation layer having a larger diameter than the outer heat insulation layer is interposed, and the outer heat insulation layer is supported from the inner tank via the support heat insulation layer. In the point.

[Action and effect]
The cylindrical heat insulating layer provided between the cylindrical cover and the cylindrical body is composed of an inner heat insulating layer fixed to the cylindrical body side, and an outer heat insulating layer between the inner heat insulating layer and the cylindrical cover, Since the outer heat insulating layer is configured by filling a heat insulating material that can be deformed following the deformation of the cylindrical cover, the outer heat insulating layer is formed by repeating the deformation of the cylindrical cover and its return deformation. The heat insulation material, that is, the compression and decompression of the heat-insulating material mass that can be deformed following the deformation of the cylindrical cover is repeated, and the degree of filling of the heat insulation material constituting the outer heat insulation layer becomes uneven. However, the deterioration of the heat insulation performance for the cylinder can be mitigated by the inner heat insulating layer fixed to the cylinder side, and the cylinder part is insulated regardless of repeated deformation of the cylindrical cover and its return deformation. It is easy to ensure the heat insulating performance of the cylindrical heat insulating layer over a long period of time.
Furthermore, between the lower end of the outer heat insulating layer and the inner tank, a support heat insulating layer having a diameter larger than that of the outer heat insulating layer is interposed, and the outer heat insulating layer is supported from the inner tank via the support heat insulating layer. The outer heat insulating layer constituting the cylindrical heat insulating layer is shifted to the inner tub side by its own weight, and the deterioration of the heat insulating performance with respect to the cylindrical portion inside the cylindrical cover can be prevented. As a result, it becomes easy to maintain the heat insulation performance with respect to the cylindrical part inside the cylindrical cover.

  The second characteristic configuration of the present invention is that the inner heat insulating layer is formed by fixing a molded heat insulating material formed in a shape substantially along the outer shape of the cylindrical body to the cylindrical body side.

[Action and effect]
Since the inner heat insulating layer is formed by fixing a molded heat insulating material formed in a shape substantially conforming to the outer shape of the cylindrical body to the cylindrical body side, for example, a sheet-like heat insulating material is used on the construction site on the outer peripheral surface of the cylindrical body Compared to the case of wrapping along the side, it is easier to fix the inner heat insulating layer to the cylinder side.

Embodiments of the present invention will be described below with reference to the drawings.
1 and 2 show a low-temperature liquefied gas (liquefied natural gas (LNG) in this embodiment) storage facility according to the present invention, in which a foundation slab 2 supported by a steel pipe pile 1 is provided in a substantially circular shape and is made of steel. The tank 3 and the inner steel tank 4 inside it are installed concentrically, and the outer wall of the prestressed concrete cylindrical outer wall (breakwater bank) 5 that surrounds the outer part of the outer tank 3 over the entire circumference. 3 and the foundation slab 2 are provided integrally.

  The outer tub 3 integrally includes a steel upper roof material 7 constituting the upper surface side of the dome roof 6, a steel cylindrical outer peripheral wall 8, and a steel outer tub bottom liner 9 laid on the foundation slab 2. The inner tank 4 is integrally provided with a steel lower roof material 10 constituting the lower surface side of the dome roof 6, a steel cylindrical inner peripheral wall 11, and a steel inner tank bottom liner 12, and an outer tank bottom portion. Inside the inner tank 4, a bottom cool layer 13 is provided between the liner 9 and the inner tank bottom liner 12, and a heat insulating layer 14 is provided between the outer tank 3 and the inner tank 4 above the bottom cool layer 13. Is formed in the storage portion 15 for the low-temperature liquefied gas G.

  The heat insulating layer 14 is configured by filling a heat insulating material such as glass wool or granular pearlite between the outer tub 3 and the inner tub 4, and penetrates through the outer tub 3, the heat insulating layer 14, and the inner tub 4. A receiving pipe 16 for receiving a low-temperature liquefied gas passing through the dome roof 6 in the vertical direction and a pump barrel 17 for discharging the low-temperature liquefied gas are provided as cylinders to be used.

  The pump barrel 17 is formed of a stainless steel cylindrical pipe, and as shown in FIG. 2, a cylinder that surrounds a pump barrel portion 18 that protrudes outward from the upper roof material 7 in the pump barrel 17. A cylindrical cover 19 is provided, and a cylindrical heat insulating layer 20 is provided between the cylindrical cover 19 and the pump barrel 17.

  The cylindrical cover 19 is formed of a bellows tube having flexibility and stretchability, and is air-tightly welded to the upper roof material 7 over the entire circumference, and the upper end opening of the cylindrical cover 19 is formed. The pump barrel 17 is hermetically welded to the closing plate 21 that is hermetically closed, and the upper portion of the pump barrel 17 is fixed to the upper roofing material 7 side via the cylindrical cover 19. The lower part of the barrel 17 is fixed to the lower roofing material 10 side by air-tight welding over the entire circumference.

  The cylindrical heat insulating layer 20 is composed of an inner heat insulating layer 22 fixed to the pump barrel 17 side and an outer heat insulating layer 23 between the inner heat insulating layer 22 and the cylindrical cover 19, respectively. The heat insulating layer 22 is formed of a molded heat insulating material 24 made of polyurethane foam (PUF) that is preliminarily molded into a half-cylindrical shape substantially conforming to the outer peripheral shape of the pump barrel 17, and the outer heat insulating layer 23 is formed of a cylindrical cover. It is composed of glass wool cotton 25 as a heat insulating material that can be deformed following the deformation of 19.

  The procedure for attaching the tubular heat insulating layer 20 will be described. The tubular cover 19 is placed on the pump barrel 17 welded and fixed to the lower roof material 10 side, and the tubular cover 19 is welded and fixed to the upper roof material 7. Thereafter, the glass wool cotton 26 is attached to the closing plate 21, and the molded heat insulating material 24 inserted through the lower end opening of the cylindrical cover 19 is secured to the pump barrel 17 side with a wire or the like at the lower end of the glass wool cotton 26. An inner heat insulating layer 22 that is integrally fixed to the pump barrel 17 is provided, and then glass wool cotton 25 is filled between the inner heat insulating layer 22 and the cylindrical cover 19 through the lower end opening of the cylindrical cover 19 and the outer heat insulating layer is filled. 23 is provided.

  Further, a hard heat insulating layer that extends the inner heat insulating layer 22 and the outer heat insulating layer 23 so as to enter the heat insulating layer 14 and covers the pump barrel 17 between the lower end of the inner heat insulating layer 22 and the lower roof material 10. That is, the glass wool cotton 28 is sandwiched between the lower ends of the inner heat insulating layer 22 so that the heat insulating cover 27 made of polyurethane foam (PUF), which is harder than the outer heat insulating layer 23, has a larger diameter than the outer diameter of the cylindrical cover 19. The inner heat insulating layer 22 and the outer heat insulating layer 23 are supported on the inner tub 4 side to prevent the inner heat insulating layer 22 and the outer heat insulating layer 23 from moving in the vertical direction.

A plate-shaped heat insulating material 29 made of polyurethane foam (PUF) surrounding the outer peripheral side of the cylindrical cover 19 is mounted along the lower surface side of the upper roof material 7, and this plate-shaped heat insulating material 29 is necessary. It can be installed according to the condition.
The receiving pipe 16 is also provided with a heat insulating structure similar to that of the pump barrel 17.

[Other Embodiments]
1. The low-temperature liquefied gas storage facility according to the present invention may be composed of a soft foam heat insulating material filled with in-situ foaming between the inner heat insulating layer and the cylindrical cover and constitute the outer heat insulating layer .
2 . The low-temperature liquefied gas storage facility according to the present invention comprises a cylindrical heat insulating layer provided between a cylindrical cover and a cylindrical body by an inner heat insulating layer and an outer heat insulating layer over the entire length in the longitudinal direction. Alternatively, only a specific portion in the longitudinal direction may be constituted by the inner heat insulating layer and the outer heat insulating layer.
3 . The low-temperature liquefied gas storage facility according to the present invention may be provided with a sheath tube for mounting a sensor as a cylinder that penetrates the outer tank, the heat insulating layer, and the inner tank for liquid level detection, pressure detection, and the like. Further, a through nozzle other than the pump barrel and the sensor nozzle may be provided as a cylinder.
4 . Instead of the hard polyurethane foam heat insulating cover 27 shown in the embodiment, the outer heat insulating layer 23 and the cylindrical cover 19 are mounted so as to have a larger diameter than the outer diameter, and the outer heat insulating layer 23 is slipped off. You may provide the glass wool sheet | seat mounted | worn so that it might prevent.
5 . The low-temperature liquefied gas storage facility according to the present invention may be a low-temperature liquefied gas storage facility such as liquefied propane gas, liquid oxygen, or liquid hydrogen.

Schematic longitudinal section of cryogenic liquefied gas storage facility Longitudinal section of the main part

Explanation of symbols

DESCRIPTION OF SYMBOLS 3 Outer tank 4 Inner tank 6 Dome roof 7 Upper roof material 8 Cylindrical outer peripheral wall 10 Lower roof material 11 Cylindrical inner peripheral wall 14 Thermal insulation layer 15 Storage part 17 Cylindrical body 18 Cylindrical part 19 Cylindrical cover 20 Cylindrical thermal insulation layer 22 Inner heat insulating layer 23 Outer heat insulating layer 25 Heat insulating material 24 Molded heat insulating material 27 Heat insulating layer G Low-temperature liquefied gas

Claims (2)

The lower roof material and the cylindrical inner peripheral wall constituting the lower surface side of the dome roof are integrally provided inside the outer tub which is integrally provided with the upper roof material and the cylindrical outer peripheral wall constituting the upper surface side of the dome roof. Providing an inner tank, providing a heat insulating layer between the outer tank and the inner tank, forming the inner side of the inner tank in a low-temperature liquefied gas reservoir,
Fixing the cylindrical body penetrating over the outer tub, the heat insulating layer and the inner tub to the inner tub side,
A cylindrical cover provided with flexibility and stretchability surrounding a cylindrical portion projecting outward from the outer tub of the cylindrical body is provided, and the cylindrical tube is provided via the cylindrical cover. Fixing the body to the outer tub side,
A low-temperature liquefied gas storage facility in which a cylindrical heat insulating layer is provided between the cylindrical cover and the cylindrical body,
The cylindrical heat insulating layer is composed of an inner heat insulating layer fixed to the cylindrical body side, and an outer heat insulating layer between the inner heat insulating layer and the cylindrical cover,
The outer heat insulating layer is configured by filling a deformable heat insulating material following the deformation of the cylindrical cover ,
Between the lower end of the outer heat insulating layer and the inner tank, a support heat insulating layer having a larger diameter than the outer heat insulating layer is interposed, and the outer heat insulating layer is supported from the inner tank via the support heat insulating layer. cryogenic liquefied gas storage facilities it has.   The low-temperature liquefied gas storage facility according to claim 1, wherein the inner heat insulating layer is formed by fixing a molded heat insulating material formed in a shape substantially along the outer shape of the cylindrical body to the cylindrical body side.

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