JP2019199949A - Low-temperature liquid storage tank - Google Patents

Abstract

To provide a low-temperature liquid storage tank having a pile foundation structure for enabling 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, 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 liner part 7 having an air-impermeable material provided integrally on the surface of the concrete part, the liner part being disposed on the concrete part at its outer face side opposite to the vacuum insulation layer. On the lower and lateral sides of a bottom panel 8 of the outer tank, a support bottom panel 21 is provided for encircling the bottom panel. The support bottom panel is constructed via a pile foundation 10.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 a liner portion integrally formed with a gas-impermeable material on a surface of the concrete portion, and the liner portion is the vacuum of the concrete portion. It is configured to be arranged on the outer surface side opposite to the heat insulating layer, and a supporting bottom plate surrounding the bottom plate is provided below and on the side of the bottom plate of the outer tub, and the supporting bottom plate is constructed via a pile foundation It is characterized by being.

  In the cryogenic liquid storage tank of the present invention, it is desirable that the air-impermeable material is a steel plate.

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 liner portion (outside the concrete portion) The force of adsorbing to the concrete part works on the air-impermeable material.
In addition, even if cracks have occurred 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 the force adsorbed to the concrete part by the liner part provided outside the concrete part Will work.

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

  Therefore, in the cryogenic liquid storage tank of the present invention, when the air-impermeable material in the liner part evacuates the vacuum heat insulating layer and adheres closely to the outer surface of the concrete part, the liner part is provided inside the concrete part. As compared with the above, the number of anchors and the like for joining the air-impermeable material of the liner portion to the concrete portion can be greatly reduced, and airtightness can be suitably ensured.

  In addition, since the impervious material such as the steel plate of the liner part is joined to the outer surface of the concrete part, the work of attaching this impervious material compared to the case of joining the impervious material such as the steel plate to the inner surface of the concrete part. It is also possible to easily improve the workability.

  In addition, the vacuum heat insulating layer is evacuated and the air-impermeable material in the liner part automatically adheres to the outer surface of the concrete part. The portion between the anchors does not bend or buckle due to the 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 cryogenic liquid storage tank of the present invention, a supporting bottom plate is provided via a pile foundation, and an outer tub is provided so as to be supported by the supporting bottom plate. That is, since it is not the structure which an outer tank and a pile are joined directly, a tank can be constructed without affecting the liner part provided in the outer tank. 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.

  Hereinafter, a cryogenic liquid storage tank according to an embodiment of the present invention will be described with reference to FIGS. 1 to 3. 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 part (concrete body) 6 including, for example, a reinforced concrete bottom plate part, a side wall part, and a roof part, and the surface of the concrete part 6. And a liner portion 7 made of an air-impermeable material such as a steel plate attached integrally to the housing.

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 is provided on the inner surface 6a (the surface on the vacuum heat insulating layer 4 side) by fixing a steel plate as an impermeable material (airtight member) with 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), an impermeable material such as a steel plate is anchored to the outer surface 6b of the concrete portion 6 of the outer tub 3. The liner portion 7 is provided by being fixed by the fixing means. The liner portion 7 is formed so that, for example, a plurality of steel plates are joined by welding or the like, and the inner airtightness can be secured.

  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. 1 and 3, the upper end portion (tip portion) 11 a of the pile 11 is joined so that a part thereof enters the supporting bottom plate 21. In the present embodiment, the pile 11 and the supporting bottom slab 21 are made of reinforced concrete. In addition, about the structure of the pile 11 and the support bottom slab 21, structures other than a reinforced concrete structure may be sufficient.

  The support bottom plate 21 includes a bottom plate portion 22 joined to the pile 11 and a side plate portion 23 formed so as to rise vertically upward from the peripheral edge portion of the bottom plate portion 22.

  The bottom plate portion 22 is formed in a flat plate shape having a size on which the bottom plate 8 of the outer tub 3 can be placed. The side plate portion 23 is formed with a height that covers the side surface of the bottom plate 8 of the outer tub 3.

  The cryogenic liquid storage tank 1 is disposed in the recess 24 formed by the bottom plate portion 22 and the side plate portion 23 of the supporting bottom plate 21 so that the bottom plate 8 of the outer tub 3 is placed thereon.

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

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

  Therefore, in the low-temperature liquid storage tank 1 of the present embodiment, the steel plate of the liner portion 7 evacuates the vacuum heat insulating layer 4 and adheres closely to the outer surface 6b of the concrete portion 6. Therefore, the liner portion is provided inside the concrete portion 6. Compared with the case where it provides, the number of anchors etc. for joining the steel plate of liner part 7 to concrete part 6 can be reduced significantly.

  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.

  Further, since the vacuum heat insulating layer 4 is evacuated and the steel plate of the liner portion 7 automatically comes into close contact with the outer surface 6b of the concrete portion 6, a negative vacuum is applied as in the case where the steel plate is joined to the inner surface 6a of the concrete portion 6. A portion between adjacent anchors is not deformed by bending or buckling due to pressure. Further, the steel plate does not peel off. This makes it possible to form the highly reliable liner portion 7 even when a thin steel plate is employed.

Furthermore, in the cryogenic liquid storage tank 1 of the present embodiment, a support bottom plate 21 is provided via the pile 11, and the outer tub 3 is provided so as to be supported by the support bottom plate 21. That is, since the outer tub 3 and the pile 11 are not directly joined, the tank 1 can be constructed without affecting the liner portion 7 provided in the outer tub 3. 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 the liner part 7 can be provided 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.

  Although the description has been made assuming that the air-impermeable material of the liner portion 7 of the present embodiment is a steel plate, the material of the air-impermeable material is not particularly limited as long as the air-tightness can be secured, For example, a material made of resin or the like (FRP plate (resin fiber composite plate) or the like) may be used.

  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 when the inner tank 2 is cooled by the cryogenic liquid 1 stored in the inner tank 2 to generate vibration at the atomic / molecular level, and even when radiation is generated by this vibration (electromagnetic wave), Radiation can be blocked by a plate-like 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 Liner part 8 Bottom plate 11 Pile 21 Support bottom plate L Low temperature liquid

Claims (2)

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,
In addition, the outer tub includes a concrete portion and a liner portion integrally provided with a gas-impermeable material on a surface of the concrete portion, and the liner portion is opposite to the vacuum heat insulating layer of the concrete portion. Arranged on the outer surface side,
A supporting bottom plate surrounding the bottom plate is provided below and on the side of the bottom plate of the outer tub,
The support bottom plate is constructed through a pile foundation, and is a cryogenic liquid storage tank. The cryogenic liquid storage tank according to claim 1,
A cryogenic liquid storage tank, wherein the air-impermeable material is a steel plate.

Images