JPH0625194U - Double shell spherical tank support structure - Google Patents

Abstract

(57) [Abstract] [Purpose] To provide a support structure for a double-shell spherical tank that can improve the earthquake resistance and can reduce the thickness of the outer sphere. [Structure] The inner sphere 2 containing the cryogenic liquid 6 is attached to a cold insulating material 9
In a double-shell spherical tank surrounded by outer spheres 8 via a base 1, a plurality of pedestals 3 each having a heat insulating material 5 filled therein are erected on a base 1 in an annular shape, and on the pedestals 3 A supporting structure for a double-shell spherical tank, characterized in that the inner sphere 2 is supported.

Description

[Detailed description of the device]

[0001]

[Industrial applications]

 The present invention relates to a double-shell spherical tank that stores cryogenic storage such as LN and LOX, and more particularly, to a double-shell spherical tank that improves the seismic resistance by improving the support structure of the inner sphere. Regarding the structure.

[0002]

[Prior art]

 As a double-shell spherical tank for storing cryogenic storage such as LN, LOX, LAr, and LNG, an inner sphere suspension type structure as shown in FIG. 2 is known. As shown in the figure, this tank a includes an inner sphere c accommodating a cryogenic liquid b, an outer sphere d surrounding the cryogenic liquid b at a predetermined interval, and a cold insulating material e filled between the inner sphere c and the outer sphere d. The outer sphere d 1 is supported on a base g via a pillar f, and the inner sphere c is suspended in the outer sphere d via a hanger rod h. That is, the pillar f supports the outer sphere d, and the outer sphere d suspends the inner sphere c.

[0003]

[Problems to be solved by the device]

 However, in this configuration, when the base g shakes in the event of an earthquake or the like, the inner sphere c suspended by the outer sphere d via the hanger rod h rages like a pendulum, which is not preferable in terms of earthquake resistance. . Further, the outer sphere d that suspends the inner sphere c needs to have rigidity at least to support the load of the inner sphere c and the cryogenic liquid b, and the strength is increased by increasing the plate thickness of the supporting portion. It has to be done and the manufacturing cost is high.

An object of the present invention, which was devised in consideration of the above circumstances, is to provide a support structure for a double-shell spherical tank that can improve the earthquake resistance and reduce the thickness of the outer ball. is there.

[0005]

[Means for Solving the Problems]

 In order to achieve the above object, the present invention provides a double-shell spherical tank in which an inner sphere containing a cryogenic liquid is surrounded by an outer sphere via a heat insulating material. A plurality of filled pillars are erected in an annular shape, and the inner sphere is supported on these pillars.

[0006]

[Action]

 According to the above configuration, since the inner sphere is directly supported by the pedestal that is structurally and technically stable without an outer sphere, the seismic resistance is improved. Moreover, since the load of the inner sphere is not applied to the outer sphere at all, high rigidity is not required and the thickness of the outer sphere can be reduced.

Further, since the pedestal is filled with the heat insulating material, the cold air that tries to escape from the inner sphere through the pedestal is blocked by the heat insulating material, and the cold insulation property is improved.

[0008]

【Example】

 An embodiment of the present invention will be described below with reference to the accompanying drawings.

As shown in FIG. 1, a plurality of pedestals 3 for supporting the inner sphere 2 are erected on a base 1 in an annular shape. Each pedestal 3 is constructed by integrally welding an upper inner ball leg 3a and a lower outer ball leg 3b through an intermediate plate 4. The inner ball leg 3a is made of a stainless steel (SUS) cylindrical body, and a heat insulating material 5 such as pearlite or urethane is filled in the inside thereof. On the other hand, the outer ball leg 3b is made of a carbon steel (C, S) cylinder, and the intermediate plate 4 is made of a carbon steel (C, S) disk.

An inner ball 2 containing a cryogenic liquid 6 (LN, LOX, LAr, LNG, etc.) is welded or adhesively fixed to the upper end of the column 3, that is, the upper end of the inner ball leg 3a. More specifically, a mounting table 7 that conforms to the curved surface of the inner ball 2 is provided at the upper end of the inner ball leg 3a. Contacted or fixed by adhesion. The above-described table 7 is made of the same material as the inner sphere 2 and follows the thermal expansion and contraction of the inner sphere 2. Therefore, the mounting table 7 and the inner ball 2 are not separated from each other.

An outer sphere 8 is provided around the inner sphere 2 at a predetermined interval, and a cooler material 9 such as pearlite particles is filled between the inner sphere 2 and the outer sphere 8. Has been done. A cylindrical cold box 10 is provided on the lower surface of the outer ball 8 so as to cover the inner ball legs 3a, and the lower ends of these cold boxes 10 are fixed to the intermediate plate 4 of the pedestal 3 by welding. There is. A space between the cold box 10 and the inner ball leg 3a is filled with a cold insulating material 9 such as pearlite grains. According to this configuration, the own weight of the outer sphere 8 is supported by the intermediate plate 4 of the pedestal 3 via the cold box 10.

The operation of this embodiment having the above configuration will be described.

As shown in FIG. 1, since the inner sphere 2 is directly supported by the pedestal 3 which is structurally and technically stable, without the outer sphere 8 being interposed unlike the conventional case. , Seismic resistance is enhanced and safety is improved. Further, since the load of the inner sphere 2 is not applied to the outer sphere 8, high rigidity is not required and the plate thickness of the outer sphere 8 can be reduced. In other words, the outer sphere 8 only needs to have a rigidity that does not crush (deform) when its own weight is supported by the intermediate plate 4 of the pedestal 3, which results in extremely low cost.

Since the heat insulating material 5 is filled in the inner ball leg 3 a of the pedestal 3, the cool air that escapes from the inner ball 2 along the inner ball leg 3 a escapes by the heat insulating material 5. The convection is prevented and blocked. Therefore, the cold insulation property is improved. Further, the cool air transmitted to the intermediate plate 4 via the inner ball leg 3a is radiated to the atmosphere by the intermediate plate 4 functioning as a heat radiating plate. As a result, frosting on the intermediate plate 4 is prevented, and cold air is not transmitted to the base 1 side.

[0015]

[Effect of device]

 As described above, according to the support structure for a double-shell spherical tank according to the present invention, it is possible to improve the earthquake resistance, and at the same time, it is possible to reduce the thickness of the outer ball.

[Brief description of drawings]

FIG. 1 is an explanatory view of a support structure for a double shell spherical tank according to an embodiment of the present invention.

FIG. 2 is an explanatory view of a support structure of a double-shell spherical tank showing a conventional example.

[Explanation of symbols]

 1 base 2 inner sphere 3 pedestal 3a inner sphere leg 3b outer sphere leg 5 heat insulating material 6 cryogenic liquid 8 outer sphere 9 cold insulation material

Claims (1)

[Scope of utility model registration request] 1. A double-shell spherical tank in which an inner sphere containing a cryogenic liquid is surrounded by an outer sphere via a cooling material, and a pedestal having a heat-insulating material filled therein is provided on a base. A support structure for a double-shell spherical tank, wherein a plurality of erections are provided in an annular shape, and the inner sphere is supported on these pedestals.