JP2019199948A - Low-temperature liquid storage tank - Google Patents

Abstract

To provide a low-temperature liquid storage tank having a pile foundation structure to enable suitable storage of ultra-low-temperature liquid such as liquefied hydrogen even if the amount is huge on the order of tens of thousands kL.SOLUTION: The low-temperature liquid storage tank includes an inner tank 2 for storing low-temperature liquid L, an outer tank 3 arranged encircling and wrapping the inner tank, and a vacuum insulation layer 4 provided between the inner tank and the outer tank. The outer tank includes a concrete part 6, and a steel-sheet outer tank liner part 7 as an air-impermeable material provided on the surface of the concrete part, the outer tank liner part being disposed on the concrete part at its outer face side opposite to the vacuum insulation layer, the outer tank being constructed via a pile foundation. In sites of the outer tank liner part where piles 11 are inserted, through-holes are formed. On sites of the piles to be joined to the outer tank, pile liner parts 12 are provided for covering the upper end faces and the lateral faces of the piles while blocking the through-holes. The outer tank liner part and the pile liner parts are welded and joined to each other.SELECTED DRAWING: Figure 1

Description

  The present invention relates to a cryogenic liquid storage tank used for storing a cryogenic liquid such as liquefied hydrogen.

  Conventionally, as a tank for storing a low-temperature liquid such as liquefied natural gas (LNG) and liquefied petroleum gas (LPG), a double-shell tank having an inner tank and an outer tank is used.

  In addition, this type of tank is, for example, a concrete base plate, a metal inner tank (storage tank) and an outer tank installed on the base plate, and a cooling function filled between the inner tank and the outer layer. It is configured to include a cold insulating material (heat insulating material) such as urethane foam, polyisocyanurate foam, and pearlite that exhibits a heat insulating function (see, for example, Patent Document 1).

JP 2014-194256 A

  Here, unlike conventional fossil fuels, hydrogen can be produced in large quantities from a variety of raw materials, and it can realize the ultimate clean performance that generates only water during combustion and emits no greenhouse gases. It is attracting attention as an energy source for power generation.

  In order to put hydrogen power generation into practical use, a large storage tank for liquefied hydrogen of the order of 10,000 kL, such as a storage tank for LNG or LPG, will be required in the future. It is difficult to store in a storage tank as it is. For this reason, there is a strong demand for a tank capable of storing a large amount of ultra-low temperature liquefied hydrogen on the order of 10,000 kL.

  As a tank that can store a large amount of ultra-low temperature liquefied hydrogen, an inner tank that stores liquefied hydrogen, an outer tank that surrounds and encloses the inner tank, and a vacuum provided between the inner tank and the outer tank The outer tub includes a concrete portion and a liner portion (such as a steel plate) integrally provided with a gas-impermeable material on a surface of the concrete portion, and the liner portion is disposed on the concrete portion. A tank having a structure arranged on the outer surface side is known.

  However, when the liner portion is disposed on the outer surface side of the outer tub, if the tank foundation is a pile foundation, the performance of the liner may be deteriorated at the joint portion between the liner portion and the pile.

  Therefore, the present invention has been made in view of the above circumstances, has a pile foundation structure, and can suitably store an ultra-low temperature liquid such as liquefied hydrogen even in a large amount on the order of 10,000 kL. An object is to provide a cryogenic liquid storage tank.

  In order to achieve the above object, the present invention provides the following means.

  The cryogenic liquid storage tank of the present invention includes an inner tank for storing a cryogenic liquid, an outer tank disposed so as to surround and enclose the inner tank, and a vacuum provided between the inner tank and the outer tank. A heat insulating layer, and the outer tub includes a concrete portion and an outer tub liner portion made of a steel plate which is an air-impermeable material provided on a surface of the concrete portion, and the outer tub liner portion. Is disposed on the outer surface of the concrete portion opposite to the vacuum heat insulating layer, the outer tub is constructed via a pile foundation, and the pile in the outer tub liner portion is inserted A through-hole is formed in the pile, and a pile liner portion that covers an upper end surface and a side surface of the pile and closes the through-hole is provided at a location where the pile is joined to the outer tank. And the pile liner are welded together It is characterized in Rukoto.

According to the low-temperature liquid storage tank of the present invention, when the vacuum heat insulating layer is brought into a vacuum state, air in the gap between the porous concrete portion (concrete body) is also released, and the outer tank liner provided outside the concrete portion The part (impervious material) is attracted to the concrete part.
In addition, even if cracks occur in the concrete part, if the vacuum heat insulating layer is brought into a vacuum state, the air in the concrete part is released through the cracks and is adsorbed by the outer tank liner part provided outside the concrete part. The power to do will work.

  Thereby, while making a vacuum heat insulation layer into a vacuum, the air-impermeable material of an outer tank liner part will closely_contact | adhere automatically to the outer surface of a concrete part.

  Therefore, in the cryogenic liquid storage tank of the present invention, the air-impermeable material of the outer tank liner part evacuates the vacuum heat insulating layer and adheres closely to the outer surface of the concrete part, thereby providing a liner part inside the concrete part. Compared to the case, the number of anchors and the like for joining the air-impermeable material of the outer tank liner portion to the concrete portion can be greatly reduced, and airtightness can be suitably ensured.

  Also, since the outer tank liner made of steel plate is joined to the outer surface of the concrete part, it is easier to install this air-impermeable material compared to the case of joining an air-impermeable material such as steel plate to the inner surface of the concrete part. It is also possible to greatly improve the workability.

  In addition, the vacuum insulation layer is evacuated and the outer tank liner part (impermeable material) automatically adheres to the outer surface of the concrete part, so that the impermeable material is joined to the inner surface of the concrete part. The portion between the anchors does not bend or buckle due to the negative vacuum pressure. Moreover, peeling does not occur in the air-impermeable material. This makes it possible to form a highly reliable liner even if a thin steel plate is employed as the air-impermeable material.

  Furthermore, in the low-temperature liquid storage tank of the present invention, the tank is constructed via a pile foundation, but the outer tank liner portion and the pile liner portion also at the joint between the pile and the outer tank (bottom plate). And the liner is continuously provided. That is, even when a tank is constructed using a pile, a highly reliable liner can be formed.

  Therefore, it is possible to provide a cryogenic liquid storage tank that has a pile foundation structure and can suitably store an ultra-low temperature liquid such as liquefied hydrogen even in a large amount of the order of 10,000 kL.

It is sectional drawing which shows the cryogenic liquid storage tank which concerns on one Embodiment of this invention. It is sectional drawing which shows the cryogenic liquid storage tank which concerns on one Embodiment of this invention, and is the figure which expanded the A section of FIG. It is sectional drawing which shows the cryogenic liquid storage tank which concerns on one Embodiment of this invention, and is the figure which expanded the B section of FIG. It is a perspective view which shows the joining state of the outer tank liner part which concerns on one Embodiment of this invention, and the liner part for piles.

  Hereinafter, a cryogenic liquid storage tank according to an embodiment of the present invention will be described with reference to FIGS. 1 to 4. Here, this embodiment relates to a tank suitable for use in storing ultra-low temperature liquid such as liquefied hydrogen.

  As shown in FIGS. 1 and 2, the cryogenic liquid storage tank 1 of the present embodiment is an outer tank provided so as to surround the inner tank 2 made of metal (steel plate) for storing the cryogenic liquid L and the inner tank 2. The tank 3 is provided between the inner tank 2 and the outer tank 3 and includes a vacuum heat insulating layer 4 for ensuring heat insulating performance.

  The vacuum heat insulating layer 4 is configured to be held in a vacuum state by sucking air or the like and filled with, for example, a powder / solid radiation shield material 5. Note that the radiation shield material 5 has a heat insulation property by absorbing / blocking the heat transfer effect (electromagnetic wave) associated with this vibration, for example, when the low temperature liquid L comes into contact with the steel plate of the inner tank 2 vibrating at the atomic / molecular level. This is to prevent the decrease.

  Next, the outer tub 3 of the present embodiment covers the entire surface of the concrete portion (concrete body) 6 including, for example, a reinforced concrete bottom plate portion, a side wall portion, and a roof portion, and the surface of the concrete portion 6. And an outer tub liner portion 7 made of a steel plate (impermeable material) attached integrally to the outer tub.

Here, when providing the vacuum heat insulation layer 4 between the inner tank 2 and the concrete part 6 (outer tank 3), since the concrete part 6 of the outer tank 3 is a porous body, normally, the concrete part 6 of this concrete part 6 is used. A liner portion may be provided by fixing a steel plate as an air-impermeable material (air-tight member) to the inner surface 6a (surface on the vacuum heat insulating layer 4 side) by a fixing means such as an anchor.
However, in this case, a large suction force is generated on the steel plate of the liner portion due to the negative pressure of the vacuum heat insulating layer 4, and the steel plate portion between adjacent anchors may be bent or buckled. Further, the steel sheet may be peeled off.

  On the other hand, in the cryogenic liquid storage tank 1 of the present embodiment, as shown in FIG. 2 (see FIG. 1), a steel plate (impermeable material) is anchored to the outer surface 6b of the concrete portion 6 of the outer tub 3 or the like. The outer tank liner portion 7 is provided by being fixed by the fixing means. In addition, the outer tank liner part 7 joins a some steel plate, for example by welding etc., and it forms it so that inner airtightness can be ensured.

  Next, as shown in FIG. 1, the cryogenic liquid storage tank 1 of the present embodiment is constructed via a plurality of piles 11 arranged on the ground G. That is, the cryogenic liquid storage tank 1 has a pile foundation structure 10.

As shown in FIGS. 3 and 4, the upper end portion (tip portion) 11 a of the pile 11 is joined so that a part thereof enters the bottom plate 8 of the outer tub 3.
Here, the joint location between the bottom slab 8 of the outer tub 3 and the upper end portion 11a of the pile 11 will be described in detail.
Although the outer tank liner part 7 is arranged on the outer surface 6b of the concrete part 6 of the outer tank 3, a through hole 7a is formed at a place where the pile 11 is inserted. A pile liner portion 12 is provided so as to cover the upper end surface 11b of the pile 11 and the side surface 11c connected to the upper end surface 11b and to cover the gap between the through hole 7a and the pile 11.

  The pile liner portion 12 includes a hat portion 12 a that covers the upper end surface 11 b and the side surface 11 c of the pile 11, and a flange portion 12 b that covers a gap between the through hole 7 a and the pile 11. It is preferable that the hat portion 12a is formed with a size such that the inner surface of the hat portion 12a and the outer surface of the pile 11 are in contact with each other. Moreover, the collar part 12b should just be formed in the magnitude | size which plugs up the clearance gap between the through-hole 7a and the pile 11, and has the welding allowance with the outer tank liner part 7. FIG. The pile liner portion 12 is installed so as to cover the top of the pile 11. Note that the pile liner portion 12 and the pile 11 are not fixed.

  And the outer tank liner part 7 and the liner part 12 for piles are welding joined over the perimeter in the joint surface. Moreover, all the piles 11 have the same structure.

  In the low-temperature liquid storage tank 1 of the present embodiment configured as described above, when the vacuum heat insulating layer 4 is in a vacuum state, air in the gap between the concrete portion 6 that is a porous body also escapes and is provided outside the concrete portion 6. The force adsorbed to the concrete part 6 acts on the outer tank liner part 7 thus formed. Further, even when a crack is generated in the concrete part 6, the air in the concrete part 6 is released through the crack, and the force adsorbed to the concrete part 6 acts on the outer tank liner part 7.

  As a result, the vacuum heat insulating layer 4 is evacuated and the steel plate (impermeable material) of the outer tub liner portion 7 is automatically brought into close contact with the outer surface 6 b of the concrete portion 6.

  Therefore, in the cryogenic liquid storage tank 1 of the present embodiment, the steel plate of the outer tub liner portion 7 evacuates the vacuum heat insulating layer 4 and adheres closely to the outer surface 6b of the concrete portion 6, so that the liner is placed inside the concrete portion 6. Compared with the case where a part is provided, the number of anchors and the like for joining the steel plate of the outer tub liner part 7 to the concrete part 6 can be greatly reduced.

  In addition, by joining a steel plate to the outer surface 6b, it is possible to facilitate the mounting work of the steel plate and to greatly improve the workability as compared with the case of joining a steel plate to the inner surface 6a of the concrete portion 6. become.

  Moreover, since the vacuum heat insulating layer 4 is evacuated and the steel plate of the outer tub liner portion 7 is automatically brought into close contact with the outer surface 6b of the concrete portion 6, the vacuum is applied as in the case of joining the steel plate to the inner surface 6a of the concrete portion 6. The negative pressure does not cause the portion between adjacent anchors to bend or buckle. Further, the steel plate does not peel off. This makes it possible to form a highly reliable liner portion even when a thin steel plate is employed.

Furthermore, in the cryogenic liquid storage tank 1 of the present embodiment, the tank 1 is constructed via a pile foundation, but the outer tank liner is also used at the joint between the pile 11 and the outer tank 3 (bottom plate 8). The liner is provided continuously by the portion 7 and the pile liner portion 12. That is, even when the tank 1 is constructed using the piles 11, a highly reliable liner can be formed.
And by providing the said structure, it can resist the horizontal force which acts on the cryogenic liquid storage tank 1 at the time of an earthquake, etc., and can install a liner in the outer surface whole surface of the outer tank 3. FIG.

  Therefore, according to the low-temperature liquid storage tank 1 of the present embodiment, it has a pile foundation structure 10 and can suitably store an ultra-low temperature liquid such as liquefied hydrogen even in a large amount on the order of 10,000 kL. Become.

  As mentioned above, although one embodiment of the cryogenic liquid storage tank according to the present invention has been described, the present invention is not limited to the above embodiment, and can be appropriately changed without departing from the scope of the present invention.

  For example, in the present embodiment, the cryogenic liquid storage tank according to the present invention has been described as storing liquefied hydrogen, but of course, the cryogenic liquid according to the present invention may be used to store other cryogenic liquids such as LNG and LPG. A storage tank may be applied.

  In addition, the vacuum heat insulating layer 4 is filled with a powdered or solid radiation shielding material 5 to prevent (suppress) heat transfer by radiation. The plate-shaped radiation shielding material is an intermediate portion of the vacuum heat insulating layer 4. You may make it install in.

  In this case, even if the inner tank 2 is cooled by the low temperature liquid L stored in the inner tank 2 to generate vibration at the atomic / molecular level, and radiation (electromagnetic wave) causes radiation, Radiation can be blocked by a plate-shaped radiation shield material disposed in the middle of the vacuum heat insulating layer 4. Thereby, the heat transfer action can be surely interrupted by the vacuum heat insulating layer 4, and the highly reliable cryogenic liquid storage tank 1 can be realized.

  Further, most of the vacuum heat insulating layer 4 in a state where the plate-like radiation shield material is disposed is held in a space, and the space is in a vacuum state. For this reason, it is possible to easily increase the degree of vacuum of the vacuum heat insulating layer 4 and to easily maintain the degree of vacuum as compared with the case where the conventional powdery / solid radiation shielding material 5 is filled. Become.

  Further, when a plate-shaped radiation shield material is employed, maintenance can be easily performed as compared with the case where the vacuum heat insulating layer 4 is filled with the powder / solid radiation shield material 5.

DESCRIPTION OF SYMBOLS 1 Low temperature liquid storage tank 2 Inner tank 3 Outer tank 4 Vacuum heat insulation layer 5 Powder form / solid radiation shield material 6 Concrete part 6a Inner surface 6b Outer surface 7 Outer tank liner part 7a Through-hole 10 Pile foundation 11 Pile 11b Upper end surface 11c Side 12 Pile liner L Low temperature liquid

Claims (1)

An inner tank for storing a cryogenic liquid;
An outer tub disposed to surround and enclose the inner tub,
A vacuum heat insulating layer provided between the inner tank and the outer tank,
And the outer tub comprises a concrete portion and an outer tub liner portion made of a steel plate which is an air-impermeable material provided on the surface of the concrete portion, and the outer tub liner portion is disposed on the concrete portion. It is arranged and arranged on the outer surface side opposite to the vacuum heat insulating layer,
The outer tub is constructed via a pile foundation,
A through hole is formed at a place where the pile in the outer tank liner portion is inserted,
In the place where the pile is joined to the outer tub, a pile liner portion that covers the upper end surface and the side surface of the pile and closes the through hole is provided,
A cryogenic liquid storage tank, wherein the outer tank liner portion and the pile liner portion are welded together.

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