JP5013358B2 - Vertical double-shell cylindrical cryogenic storage tank - Google Patents

Description

  The present invention relates to a vertical double-shell cylindrical low-temperature storage tank that stores low-temperature liquefied gas such as liquid nitrogen, liquid oxygen, and LNG.

A conventional vertical double-shell cylindrical low-temperature storage tank will be described with reference to FIG.
Reference numeral 1 denotes an inner tank that stores a low-temperature liquid, 2 an outer tank that surrounds the inner tank 1, and 3 a cold insulation layer that is provided by filling a heat insulating material between the inner tank 1 and the outer tank 2. A cylindrical skirt 4 supports the inner tank 1 and the outer tank 2 on the foundation 5.
The inner tank 1 is formed of a semi-elliptical upper end plate 6, a cylindrical intermediate body plate 7, and a semi-elliptical lower end plate 8. The outer tub 2 includes a dome-shaped outer tub roof plate 9, a cylindrical outer tub side plate 10, an inclined and inverted frustoconical ring-shaped outer tub side plate 11, and a horizontal disk-shaped outer tub bottom plate 12. And is formed from.
A center manhole 13 at the center of the roof of the outer tub 2, a roof sprinkler 14 for sprinkling water onto the roof, a plurality of pearlite manholes 15 for filling pearlite between the inner and outer tubs, and nozzles for performing measurements, etc. 16 and a roof handrail 17 is provided around the roof.
On the side surface of the outer tub 2, a lifting / lowering ladder 18 reaching the roof and a side watering device 19 for watering the side plate 10 are provided.

The invention of the conventional vertical double-shell cylindrical low-temperature storage tank includes, for example, the invention of “Outer tank support structure for vertical adiabatic low-temperature tank” Japanese Patent No. 3684318 (see Patent Document 1).
The invention of this patent document 1 “Outer tub support structure for vertical heat insulating low temperature tank” supports the inner tub on the ground with a support skirt that penetrates the outer tub of the inner and outer tub double shell tank, and radiates heat to the outer periphery of this support skirt. A cum-reinforcing ring member is provided, and the heat-radiating / strengthening ring member is connected to the lower part of the outer tank side plate by an inverted truncated cone cone.
As shown in FIG. 4 of the above-mentioned conventional example, this vertical insulated low temperature tank has an upper end plate and a lower end plate of the inner tub formed in a semi-elliptical shape, and a roof plate of the outer tub is formed in a blast-ball dome shape. .

Moreover, there exists invention of "vertical double-shell cylindrical low temperature storage" Unexamined-Japanese-Patent No. 2004-211759 (refer patent document 2) which concerns on this patent applicant.
The invention of this Patent Document 2 “Vertical Double Shell Cylindrical Low Temperature Storage Tank” is a skirt that penetrates the outer tank of the inner and outer tank double shell storage tank, supporting the inner tank and the outer tank on the foundation, and the upper end plate of the inner tank The lower end plate is formed in a hemispherical shape, and the roof plate of the outer tub is formed in a dome shape.

Japanese Patent No. 3684318 Japanese Patent Laid-Open No. 2004-211759

The conventional vertical double-shell cylindrical low-temperature storage tank shown in FIG. 4 has the shape of the outer tank roof plate 9 having a gentle blast ball dome, and a plurality of perlites on the outer tank roof plate 9. It is necessary to provide a manhole 15 and many accessories such as a nozzle 16 for measurement. Further, it is necessary to install a lifting ladder 18, a roof handrail 17 and the like from the ground foundation 5 to the outer tank roof plate 9. did.
As described above, the shape changed in accordance with the capacity and size of the storage tank, requiring many accessory equipments, requiring time and labor for the construction, and maintenance.
Further, in addition to the roof sprinkler 14 for fire extinguishing and cooling, a side sprinkler 19 for directly sprinkling water to the side tank side plate 10 is necessary and large.
And since there are many accessory equipment and a complicated shape with many protrusions, it was also disadvantageous in terms of wind and snow.

The invention of Patent Document 1 “Outer tub support structure for vertical insulated low-temperature tank” is such that the upper end plate and lower end plate of the inner tub are formed in a semi-elliptical shape or dome shape, and the roof plate of the outer tub is formed in a dome shape. Therefore, it was necessary to install a lifting ladder and a roof handrail for maintenance on the roof, and the construction was difficult.
In the invention of Patent Document 2 “Vertical Double Shell Cylindrical Low Temperature Storage Tank” of the present applicant, the upper end plate and the lower end plate of the inner tank are formed in a hemispherical shape. Frost adhesion and dew condensation on the outer surface near the connecting part can be prevented, but since the roof plate of the outer tub is formed in a dome shape, the amount of pearlite insulation between the inner and outer tubs of the roof can be reduced. Increased.

  The object of the present invention was made in view of the problems of the prior art as described above. The roof of the inner tank and the outer tank is formed in a hemispherical shape, and the amount of pearlite insulation in the inner and outer tank spaces is set. In addition, the ladder leading to the outer tub roof, handrails on the outer tub roof, nozzles, side sprinklers and other accessories and equipment are reduced to maintenance-free, reducing assembly construction, and improving the economic efficiency. A double-shell cylindrical cryogenic storage tank is provided.

Vertical location double-shelled cylindrical cold storage tank according to the invention of claim 1 is an upper end plate of hemispherical shape, an intermediate shell plate of the same radius of the cylinder-shaped with the upper end plate, the same radius as the intermediate cylinder plate hemispheres An inner tank composed of a lower end plate having a shape, an outer tank surrounding the inner tank via a cold insulation layer, the outer tank having the same center point as the upper end plate of the inner tank , and a space for the cold insulation layer A hemispherical outer tub roof plate having a size equivalent to the width, a cylindrical outer tub side plate having the same radius as the outer tier roof plate , and an inclined shape connected to the lower portion of the outer tub side plate and connected to the outer tub bottom plate an outer tub side plates consists of a horizontal disk-shaped or concave disc outer tank bottom plate shape, the inner tub and the outer tub in the skirt of cylindrical extending into the inner tank through the bottom plate end of the outer tank was supported on a foundation, provided insulation can be charged centers manhole at the top central portion of the outer tub shingle the hemispherical Rutotomoni Serial around the center manhole top central portion of the outer tub shingle hemispherical only, is obtained by placing the roof spraying device in a ring shape.

The vertical double-shell cylindrical low-temperature storage tank according to the invention of claim 2 uses the hemispherical outer tank roof plate according to claim 1 as a center frame and a peripheral frame of the outer periphery at a low position on the ground. In addition, the ring member placed on the peripheral frame is assembled and integrated using a shape fixing guide , and the integrated roof plate is lifted and connected to the upper part of the outer tank side plate. is there.

Vertical location double-shelled cylindrical cold storage tank according to the invention of claim 1 is an upper end plate of hemispherical shape, an intermediate shell plate of the same radius of the cylinder-shaped with the upper end plate, the same radius as the intermediate cylinder plate hemispheres An inner tank composed of a lower end plate having a shape, an outer tank surrounding the inner tank via a cold insulation layer, the outer tank having the same center point as the upper end plate of the inner tank , and a space for the cold insulation layer A hemispherical outer tub roof plate having a size equivalent to the width, a cylindrical outer tub side plate having the same radius as the outer tier roof plate , and an inclined shape connected to the lower portion of the outer tub side plate and connected to the outer tub bottom plate an outer tub side plates consists of a horizontal disk-shaped or concave disc outer tank bottom plate shape, the inner tub and the outer tub in the skirt of cylindrical extending into the inner tank through the bottom plate end of the outer tank was supported on a foundation, provided insulation can be charged centers manhole at the top central portion of the outer tub shingle the hemispherical Rutotomoni Serial around the center manhole top central portion of the outer tub shingle hemispherical only, since placing the roof spraying device in the form of a ring,
Since the internal pressure load and stress are evenly applied to the plate surface, it is possible to adopt a thin plate with the same thickness. Using this thin plate, the inner and outer tank hemisphere plates are manufactured with good workability by pressing into a spherical shell shape with a constant curvature. It can be applied to any size storage tank by changing the curvature of the plate thickness and the spherical diameter.
In this way, the upper end plate and lower end plate of the inner tub and the roof plate of the outer tub are made thinner and the load is reduced, so the load on the skirt is reduced and the reinforcement structure can be simplified in addition to weight reduction. In particular, by making the outer tank roof plate hemispherical, the load on the outer tank support can be reduced by reducing the load on the outer tank roof .
Furthermore, the filling of the pearlite heat insulating material into the cold insulation layer can be introduced in the circumferential direction on average using a center manhole that can be charged with the heat insulating material at the center of the top of the outer tub roof, so that a plurality of conventional heat insulating layers can be introduced. It is not necessary to provide a perlite manhole on the outer tank roof. In this way, even if the heat insulating material is put in from the center manhole provided on the top of the outer tank roof plate, the insulation layer of the roof portion is made uniform in a concentric circle, so a blind spot that is not filled with pearlite grains is not formed. Excellent storage tank.
Furthermore, since the vertical double-shell cylindrical low-temperature storage tank according to the invention of claim 1 is arranged with a ring sprinkler in a ring shape only around the center manhole at the center of the top of the hemispherical outer tank roof plate, The outer tank roof plate is formed in a hemispherical shape, the connection with the outer tank side plate is smoothly continuous, and there are no obstacles such as walkways and nozzles on the outer tank roof plate. There is no need to provide it separately, and it is possible to uniformly spray water from the outer tub roof to the outer tub side plate by the roof sprinkler arranged in a ring shape only around the center manhole in the center of the roof.
In addition, the outer tank roof plate is not provided with a roof corridor or a roof handrail, and the outer tank side plate is not provided with a lifting ladder, thereby simplifying the structure and making it maintenance-free.
Thus, it becomes possible to reduce the supporting member for supporting the vertical load by simplifying without providing accessory equipment and reducing the load.
Furthermore, since there are no protrusions on the outer tub roof plate and the outer tub side plate, there is less wind resistance, less corrosion due to stagnation of rainwater, and less impact on snow, which is advantageous.

The vertical double-shell cylindrical low-temperature storage tank according to the invention of claim 2 uses the hemispherical outer tank roof plate according to claim 1 as a center frame and a peripheral frame of the outer periphery at a low position on the ground. And the ring member placed on the peripheral frame is assembled and integrated using the shape fixing guide , and the integrated roof plate is lifted and connected to the upper part of the outer tank side plate.
In assembly using the ring member as a shape fixing guide, shape formation and shape maintenance become extremely easy.
In addition, since the ring member is provided for the connection with the upper intermediate shell plate of the outer tank side plate, it is easy to align and circumferentially align, and the storage tank has an excellent finished shape. .
Since this outer tub roof plate is self-supporting in a hemispherical shape, it can be easily lifted.
In addition, the positioning and connecting and assembling work when connecting to the upper end of the outer tub side plate is easy and effortless.
In addition, there is no work at high places on the roof, automatic welding at low places on the ground is possible, it is easy to inspect welds, work efficiency can be improved with safe work, and construction on site is also possible. It becomes easy to do.

An embodiment of a vertical double-shell cylindrical cryogenic storage tank according to the present invention will be described with reference to FIGS. 1 to 3.
FIG. 1 shows an entire longitudinal section of a vertical double-shell cylindrical cryogenic storage tank, FIG. 2 shows the vicinity of the outer tank roof, and FIG. 3 shows a case where the outer tank roof is assembled and constructed on the ground.

As shown in FIG. 1, an inner tank 1 for storing a cryogenic liquid is provided, an outer tank 2 is provided so as to surround the inner tank 1, and a cold insulation layer 3 is provided between the inner tank 1 and the outer tank 2. .
The cylindrical skirt 4 extends vertically downward from the lower end of the side surface of the inner tub 1, penetrates the end of the outer tub bottom plate 12 of the outer tub 2, and supports the inner tub 1 and the outer tub 2 on the foundation 5. .
The inner tub 1 is formed by a hemispherical upper end plate 6, a cylindrical intermediate body plate 7, and a hemispherical lower end plate 8.
The outer tub 2 has a hemispherical outer tub roof plate 9 having the same central point as the upper end plate 6 of the inner tub 1, a cylindrical outer tub side plate 10, and an inclined, inverted frustoconical ring-shaped outer tub side. The plate 11 and the outer tank bottom plate 12 having a horizontal disc shape (illustration example) or a gentle concave disc shape (not shown) having a smaller curvature than the lower end plate 8 are formed.
Further, a center manhole 13 into which a heat insulating material can be charged is provided at the center of the top of the hemispherical outer tub roof plate 9, and a roof watering device 14 is arranged around the center manhole 13 in a ring shape.

As shown in FIG. 1, the upper end plate 6 and the lower end plate 8 of the inner tub 1 are formed in a hemispherical shape, and the outer tub roof plate 9 of the outer tub 2 is hemispherical with the same center point as the upper end plate 6 of the inner tub 1. Because the internal pressure load and stress are evenly applied to the plate surface, it is possible to adopt a thin plate with the same thickness. Using this thin plate, the workability is improved by pressing into a spherical shell shape with a constant curvature. Can be produced well.
And by increasing or decreasing the diameter and curvature of the inner and outer tank hemispheres corresponding to the capacity of various cryogenic liquids, it can be easily applied to any size storage tank and can be constructed with good economic efficiency.
In addition, since the upper end plate 6 and the lower end plate 8 of the inner tub 1 and the outer tub roof plate 9 of the outer tub 2 are made of hemispherical thin plates, the load is reduced, so the load on the skirt 4 is reduced and the weight is reduced. In addition, the reinforcing structure can be simplified.
In particular, by forming the outer tank roof plate 9 into a hemispherical shape, it is possible to reduce the roof load and reduce the outer tank reinforcing member, and the cold insulation layer 3 can be filled with the pearlite heat insulating material. Since the center manhole 13 at the center of the tank roof plate 9 can be introduced in the circumferential direction on average, it is not necessary to provide a plurality of conventional perlite manholes on the outer tank roof.
Even if the heat insulating material is supplied from the center manhole 13 provided on the top of the outer tub roof plate 9 in this way, the cold insulation layer 3 of the roof portion is made uniform in a concentric circle, so that a blind spot not filled with pearlite grains is not formed. It is a storage tank with excellent thermal insulation performance.

Further, the outer tank roof plate 9 is not provided with a roof corridor or a roof handrail, and the outer tank side plate 10 does not need to be provided with an elevating ladder, thereby simplifying the structure, thereby making the outer tank roof plate 9 maintenance-free. can do.
Thus, since it is not necessary to provide accessory equipment such as a walkway, a ladder, and a nozzle on the outer tub roof plate 9 and the outer tub side plate 10, the load burden can be further reduced, and this load is supported. For this reason, it is possible to reduce the number of supporting members.
Moreover, since there are few protrusions in the outer tank roof board 9 and the outer tank side board 10, there is little wind resistance, there is also little corrosion by the retention of rainwater, and it is advantageous with respect to the load of snow.
In addition, when the upper and lower end panels and the roof panel are made into a semi-elliptical shape or a spherical shape like the conventional structure, the curvature of each part of the curved surface of the upper and lower end panels and the roof panel is not constant and is changed by the press. It will take time for the production work. The conventional semi-elliptical and oval-shaped upper and lower end panels and roof panels are required to increase the thickness in order to obtain high strength against the internal pressure load that is applied locally, leading to an increase in weight. In addition, the conventional support skirt that supports the load had to have a more robust structure.

FIG. 2 shows an enlarged view of the vicinity of the outer tub roof.
A roof watering device 14 is arranged in a ring shape around the center manhole 13 at the center of the top of the hemispherical outer tub roof plate 9.
In this way, the outer tub roof plate 9 is formed in a hemispherical shape, and the connecting portion with the outer tub side plate 10 is smoothly continuous, and further, there are no obstacles such as walkways and nozzles on the outer tub roof plate 9, It is not necessary to separately provide such a side watering device, and the roof watering device 14 provided at the center of the roof can uniformly water the outer tub side plate 10 as shown by the thin line in the figure.

FIG. 3 shows a case where the outer tub roof is assembled and constructed on the ground.
The hemispherical outer tub roof plate 9 is assembled by being assembled and welded on the ground using the center frame 22 and the peripheral frame 23 on the outer periphery at a low position on the ground 21, and the integrated outer tub roof plate 9 is integrated. Is connected to the upper part of the outer tank side plate.
First, the ring member 24 is assembled on the peripheral frame 23, then the center manhole 13 is mounted on the center frame 22 to assemble the zenith portion of the outer tub roof plate 9, and then the arch that is diametrically opposed and independent. Assemble the curved plate into a shape.
In this way, when the ring member 24 is placed on the peripheral mount 23 and the hemispherical outer tub roof plate 9 is assembled using the placed ring member 24 as a shape fixing guide, the shape is formed in the assembly. And shape maintenance becomes very easy.
In addition, the ring member 24 is also connected to the upper intermediate shell plate of the outer tank side plate, so that it is easy to align and circumferentially align, and the storage tank has an excellent finished shape. Become.
Since the outer tub roof plate 9 is self-supporting in a hemispherical shape, it can be easily lifted.
Furthermore, there is no work on the roof, and construction on site can be performed safely and efficiently.
Although not shown, automatic welding can be performed at a low place on the ground, the welded portion can be easily inspected, and the work efficiency can be improved in a safe operation.
Further, by providing the ring member 24, it is also possible to adopt a method of assembling and installing in a vertical position.

The vertical double-shell cylindrical cryogenic storage tank according to the present invention can be easily applied to any size storage tank by increasing or decreasing the diameter of the hemisphere corresponding to the capacity of various cryogenic liquids, and is constructed with good economic efficiency. can do.

It is longitudinal cross-sectional explanatory drawing which shows the embodiment of the vertical double-shell cylindrical low temperature storage tank which concerns on this invention. It is a perspective explanatory view showing the neighborhood of the center manhole of the outer tub roof part of FIG. It is explanatory drawing which shows the condition which builds the outer tank roof part of FIG. 1 in the low part on the ground. It is a longitudinal cross-sectional explanatory drawing which shows the conventional vertical double-shell cylindrical low temperature storage tank.

Explanation of symbols

DESCRIPTION OF SYMBOLS 1 Inner tank 2 Outer tank 3 Cooling layer 4 Skirt 5 Foundation 6 Upper end plate 7 Intermediate body plate 8 Lower end plate 9 Outer tank roof plate 10 Outer tank side plate 11 Outer tank side plate 12 Outer tank bottom plate 13 Center manhole 14 Roof watering device 15 Perlite Manhole 16 Nozzle 17 Roof handrail 18 Lifting ladder 19 Side watering device 21 Ground 22 Center frame 23 Peripheral frame 24 Ring member

Claims (2)

An inner tub comprising a hemispherical upper end plate , a cylindrical intermediate body plate having the same radius as the upper end plate, and a hemispherical lower end plate having the same radius as the intermediate body plate is provided, and the inner tank is provided via a cold insulation layer. An outer tub is provided surrounding the inner tub, the outer tub has the same center point as the upper end plate of the inner tub , and a hemispherical outer tub roof with a size corresponding to the space width of the cold insulation layer, and the outer tier roof A cylindrical outer tank side plate having the same radius as the plate, an inclined outer tank side plate connected to the lower part of the outer tank side plate and connected to the outer tank bottom plate, and a horizontal or concave disk-shaped outer plate The bottom of the outer tub is supported by a cylindrical skirt that extends through the bottom plate end of the outer tub and reaches the inner tub, and supports the inner and outer tubs on the foundation. top middle portion of the center between the outer tank shingle Rutotomoni the hemispherical provided insulation can be charged centers manhole section Only around the hole, the vertical location double-shelled cylindrical low-temperature storage chamber, characterized in that a roof spraying device in a ring shape.
The hemispherical outer tank roof plate is assembled and welded at a low position on the ground using a center frame and a peripheral frame on the outer periphery, and using a ring member placed on the peripheral frame as a shape fixing guide. The vertical double-shell cylindrical low-temperature storage tank according to claim 1 , wherein the integrated roof plate is lifted and connected to the upper part of the outer tank side plate.

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