JPS6030880B2 - Spherical tank support structure - Google Patents

Description

[Detailed Description of the Invention] <Industrial Application Field> This invention is applicable to the case where the support of a spherical double-shell tank in which granular heat insulating material is interposed between the inner and outer tanks is a skirt, and the skirt is filled with heat insulating material. This invention relates to a structure that does not interfere with the tank, and in particular, a spherical tank support structure in which the skirt is divided into two parts between the inner and outer tanks to facilitate the flow of the granular insulation material and to ensure sufficient strength. This invention relates to.

Conventional technology> Conventionally, spherical tanks have been widely used as double-shell cryogenic tanks due to their various advantages.

Therefore, in the spherical tank, as shown in Figures 1 and 2,
The tank consisting of an inner tank 1 and an outer tank 2 is supported by a skirt 3 as shown in Fig. 1, and by a strut 4 as shown in Fig. 2.
There are modes in which the support is supported, and the design is appropriately selected depending on various conditions.

In either embodiment, the supports 3 and 4 are connected to the inner tank 1.
Its upper end is fixed at the equator of the plane to provide support.

Therefore, the supports 3 and 4 will pass through the lower part of the outer tank 2, but there is no particular problem when filling the granular heat insulating material 5 such as perlite between the inner and outer tanks 1 and 2 as shown in the arrows. Similarly, the insulation material 5 is filled by flowing down using gravity,
Consolidation due to behavior associated with operation is also performed smoothly by filling from above. <Problems to be Solved by the Invention> However, in the case of the embodiment shown in FIG. 1, since the skirt 3 is constructed to isolate the bottom and top between the inner and outer tanks 1 and 2 as shown in the figure, the insulation material There is a problem in that the flow of the skirt 5 from the upper part to the lower part is obstructed by the skirt 3.

Therefore, in order to deal with this problem, as shown in Figs. A predetermined number of barrier holes 6 are drilled at predetermined intervals in the direction of the heat insulating material 5.
Blow filling was being carried out.

Even if the filling of the insulation material 5 at the time of tank construction is completed as designed, the insulation material 5 inside the skirt 3 will sink due to the consolidation phenomenon due to the upheaval behavior associated with tank operation, and therefore, the insulation material 5 will sink from the skirt 3. Replenishment of the upper heat insulating material 5 by gravity has the disadvantage that it is difficult to fill and supplement due to the resistance effect due to the narrowness of the barrier holes 6, and the flow is also hindered by mutual friction between particles and the angle of repose. Furthermore, as shown in FIG. 4, an arching cavity 7 is formed upward from the opening 6 due to particle interaction, and therefore, the heat insulating material 5 is not replenished from above, and the bottom heat insulating material 5' As a result, a region 8 without heat insulating material is formed inside the skirt 3, which poses a serious problem in tank operation.

Furthermore, enlarging the barrier holes 6 for replenishing the filler competes with reducing the support strength of the skirt 3, which is disadvantageous in that the degree of freedom in design is severely restricted.

The object of the present invention is to solve the technical problem of the support part of the skirt-supported spherical tank based on the above-mentioned conventional technology, and to solve the problem without obstructing the downward flow of the granular heat insulating material from the skirt part between the inner and outer tanks. It is an object of the present invention to provide an excellent novel skirt support structure for a spherical tank that provides sufficient support strength and allows stable behavior of the tank, thereby benefiting the field of tank technology application in the energy industry.

<Means/effects for solving the problems> In order to solve the above-mentioned problems, the structure of the present invention, which is based on the above-mentioned claims, is to solve the above-mentioned problems. On the other hand, the upper granular insulation material is ensured to flow downward from the expansion part of the lower skirt which is divided into two parts between the inner and outer tanks, and on the other hand, the inner ribs of the lower skirt support the upper skirt by being arranged in plural. , so that the flow of the granular heat insulating material is not obstructed in any way, and furthermore, the upper skirt can freely slide on the ribs and move freely, and the upper extension part of the reinforcing member inside the ribs is A technical measure has been taken to center the skirt and prevent it from protruding.

<Embodiment - Configuration> Next, an embodiment of the present invention will be described below based on the drawings from FIG. 5 onwards.

Components that are the same as those in FIGS. 1 to 4 will be described with the same reference numerals. A skirt 3 whose upper end is fixed to the red moving part of the inner tank 1 of the spherical tank is divided into upper and lower halves between the inner and outer tanks 1 and 2 at the part where it penetrates the outer tank 2 and extends downward, and the upper skirt 3' , and a lower skirt 3''.As shown in detail in FIG. Lips 9, 9, . It is formed in a position and orientation that does not make contact with the inner tank 1. Further, a cylindrical reinforcing member 10 is fixed to the inner back of each rib 9, as shown in FIGS. There is.

On the other hand, a shoe plate 11 is integrally fixed horizontally in a ring shape at the lower end of the upper skirt 3', and the shoe plate 11 is attached to the green 9o on the rib 9 of the lower skirt 3'' to carry the load of the spherical tank. is supported.

Embodiments - Effects> In the above configuration, when the shell of the spherical tank is constructed, filled with perlite 5 as a granular heat insulating material, and put into operation,
As mentioned above, the insulation material 5 from the skirt 3 to the lower part undergoes consolidation sinking due to the warming-up, cooling-down, etc. behavior during long-term operation, which naturally results in a decrease in volume and height. The shaped 3''' reliably supplements the upper granular insulation material 5, and the upper insulation material 5 freely flows down from the ring-shaped open loss slit formed between it and the lower part of the upper skirt 3' to achieve the above-mentioned consolidation. Automatically replenish small vertical volumes.

Further, since the filling can be performed during all cycles, there is no possibility of uneven bridge formation.

Incidentally, the upper heat insulating material 5 is filled and replenished from the upper manhole etc. as appropriate.

The displacement of the inner tank 1 due to the above-mentioned behavior and the behavior of the skirt 3 due to the thermal stress caused by the temperature distribution are such that the upper skirt 3' moves through the shoe plate 11 to the upper edge 9o of the rib 9.
Even if the shoe plate 11 slides inward beyond the allowable limit, the shoe plate 11 is supported by the upper end of the reinforcing member 10 and functions as a stopper. There is no possibility that the upper skirt 3' will fall into the lower skirt 3''.

Depending on the design, as shown in Figure 8b, reinforcing ribs 9'
The rear part of the upper edge 9o' of the sea plate 11 is made to protrude upward.
Various embodiments can be adopted, such as omitting the above, or increasing the width of the seat plate 11 and omitting the upper extension on the rib side. Effects of the Invention> As described above, according to the present invention, in a spherical tank of the skirt support type, the support part of the skirt is divided into two parts, vertically between the inner and outer tanks, and the upper part of the lower skirt is formed into a funnel-shaped expansion part. However, by providing a plurality of ribs in the expansion part and placing the upper skirt on the ribs, basically, the funnel-shaped expansion part effectively supplements the upper insulation material. The tank can always flow downward through the ring-shaped opening, so that the shortage caused by consolidation and settling of the bottom insulation material due to aging is reliably replenished, and the insulation function of the tank is always maintained.

Further, since the strength of the skirt can be freely adjusted by adjusting the thickness and size of the ribs or the dimensions of the reinforcing plate, there is an advantage that the degree of freedom in design is greatly improved. Furthermore, the upper and lower skirts can be made coaxial if they are manufactured by taking into consideration the displacement of the inner tank and the temperature distribution of the skirt, so the amount of eccentricity can be minimized. The result is that the ultimate bending stress is small, and the strength and safety are increased.

Furthermore, by extending the reinforcing member at the rear end of the rib above its upper edge, centering can be achieved, and even if thermal stress occurs due to uneven temperature distribution, the upper skirt will not slide on the rib. Not only can the displacement be made unrestricted, but also the thermal stress can be reduced in terms of strength, and in addition, it is possible to prevent the upper skirt from falling inside the lower skirt.

[Brief explanation of drawings]

Figures 1 and 2 are partial insulation diagrams of spherical tank support based on conventional technology, Figure 3 is a partial enlarged sectional view of Figure 2, Figure 4 is a schematic diagram of the insulation arch in Figure 3, and Figures 5 and below. are explanatory diagrams of embodiments of the invention of this application, FIG. 5 is a schematic sectional view of one embodiment, FIGS. 6 and 7 are partially enlarged perspective sectional views of FIG.
Figures a and 8b are partial cross-sectional views of the twill engagement relationship between the upper skirt and the ribs. 1...Inner tank, 2...Outer tank, 3, 3',
3″・・・Skirt, 3″・・・Lower skirt,
3'... Upper skirt, 3 river... Extension part, 9,
9'...rib, go, 9'. ...Top edge, 10...Reinforcement member. Figure 1 Figure 2 Figure 3 Figure 4 Figure 5 Figure 6 Figure 7 Figure 80 Figure 8b

Claims (1)

[Claims] 1. In a support part structure of a spherical tank, in which a granular heat insulating material is filled between an inner tank and an outer tank, the upper end is fixed at the equator part of the inner tank, and a skirt that extends downward through the outer tank is used as a support. , the skirt is divided into upper and lower halves between the inner and outer tanks, the upper part of the lower skirt has a funnel-shaped widening part, and a plurality of ribs are installed inside the widening part in the axial direction. A spherical tank support structure characterized in that a rib reinforcing member is fixedly installed inside the rib so as to extend upwardly from the upper edge of the rib, and the upper skirt is placed on the upper edge of the rib.