KR102163205B1 - Cyogenic liquid storage tank using fusion heat - Google Patents

Abstract

Presented is a cryogenic liquid storage tank using heat of fusion. The cryogenic liquid storage tank using the heat of fusion according to one embodiment of the present invention may comprise: an outer container; an inner container which is accommodated in the outer container by being spaced apart at a predetermined interval and stores a substance in a cryogenic state therein; a heat insulating layer in which a space between the outer container and the inner container is filled with a high vacuum or a powdered heat insulating material; and a fusion substance heat insulating layer in which a space unit is formed in at least a part of the inner side of the outer container and filled with a fusion substance heat insulating material.

Description

Cryogenic liquid storage tank using heat of fusion{CYOGENIC LIQUID STORAGE TANK USING FUSION HEAT}

The following embodiments of the present invention relate to a thermal insulation technology of a large cryogenic storage tank, and more particularly, to a cryogenic liquid storage tank using heat of fusion.

A cryogenic storage tank is a tank that stores liquid hydrogen or liquefied natural gas (LNG) or uses them as fuel. This cryogenic storage tank is composed of a dual structure of an inner container for storing liquefied gas and an outer container for maintaining the temperature of the cryogenic liquefied gas stored in the inner container, and the space between the inner container and the outer container has a high vacuum or It is composed of a structure that minimizes heat intrusion by filling a powder insulating material to minimize evaporation of liquefied gas.

1 is a schematic diagram for explaining a conventional cryogenic storage tank.

Referring to Figure 1, the conventional cryogenic storage tank 10 is made of a dual structure of the outer container 11 and the inner container 12, pearlite in the space between the outer container 11 and the inner container 12. After filling the insulating material 13 such as (perlite) powder, a vacuum is applied.

However, liquid hydrogen is an ultra-low temperature liquid with a very low temperature of -253°C and cannot effectively block heat flowing into the inner container 12 from the outside even with the above-described conventional heat insulation method, and thus continuous heat insulation improvement technology development is required.

In addition, in the fuel tank for a vehicle of liquid hydrogen or LNG, the insulation of the tank to reduce the amount of vaporization is very important.

Korean Patent Laid-Open Publication No. 10-2018-0137621 relates to a large cryogenic storage tank having such an insulating layer formed thereon. In a tank composed of a double space of an outer container and an inner container, a third space is formed inside the outer container to form a super insulating layer or a pearlite insulating layer. It describes the technique to hypothesize.

Korean Patent Publication No. 10-2018-0137621

In the present invention, in order to solve this problem, a cylindrical third space is formed on the inner wall of the outer container located in the space between the inner container and the outer container, and the freeze and thaw brine is filled in the space. It is possible to provide a cryogenic storage tank using heat of fusion.

Embodiments of the present invention describe a cryogenic liquid storage tank using heat of fusion, and more specifically, including an insulating layer of brine as a melting material in order to more effectively store cryogenic liquids such as liquid hydrogen having a liquid temperature of -253°C. Provides technology for cryogenic storage tanks.

In addition, embodiments of the present invention form an insulating layer capable of filling the melting material on the inner wall of the outer container, so that the melting material repeats freezing and thawing while using the heat of fusion to prevent evaporation loss due to heat intrusion from the outside. To provide a liquid storage tank.

A cryogenic liquid storage tank using heat of fusion according to an embodiment of the present invention includes an external container; An inner container that is accommodated in the outer container by being spaced apart from each other by a predetermined interval and stores a material in a cryogenic state therein; A heat insulating layer in which a high vacuum or powder heat insulating material is filled in the space between the outer container and the inner container; And a fusion material insulation layer in which a space part is formed in at least a portion of the inner side of the outer container to fill the fusion material insulation material.

In the heat insulating layer of the fused material, a cylindrical space is formed on the inner wall of the outer container by welding, so that brine may be filled.

The brine is freeze temperature by mixing ethylene glycol (Ethylene Glycol, HO (CH ₂ ) ₂ OH), propylene glycol (Propylene Glycol, C ₃ H ₈ O ₂ ), calcium chloride (CaCl ₂ ), alcohols, and forget-me-not with water. It may be a filling insulating material that maintains zero or zero images.

The melted material heat insulating layer has a spiral pipe connected from the inner container therein, and the spiral pipe has at least one of a liquid state and a gaseous state stored in the inner container flowing therein, and the melted material heat insulating material Can be frozen.

The cryogenic material may be a cryogenic liquid at least one of liquid hydrogen, liquid helium, LNG, and liquid nitrogen.

When the fusion material insulating material using the heat of fusion configured inside the outer container is frozen below zero, a solid insulating layer configured to prevent moisture condensation or condensation on the outer wall of the outer container may be further included.

A cryogenic liquid storage tank using heat of fusion according to another embodiment of the present invention includes an external container; An inner container that is accommodated in the outer container by being spaced apart from each other by a predetermined interval and stores a material in a cryogenic state therein; A melted material heat insulating layer disposed in a space between the outer container and the inner container and spaced apart from the outer container and the inner container by a predetermined distance, and filled with a melted material heat insulating material therein; And a heat insulating layer filled with a high vacuum or powder heat insulating material in the space between the outer container and the heat insulating layer of the melted material and the space between the heat insulating layer of the melted material and the inner container.

The fusion material heat insulating layer is composed of a donut-shaped cylinder for accommodating the inner container therein, and a space portion is formed inside the donut-shaped cylinder to be filled with brine.

The brine is freeze temperature by mixing ethylene glycol (Ethylene Glycol, HO (CH ₂ ) ₂ OH), propylene glycol (Propylene Glycol, C ₃ H ₈ O ₂ ), calcium chloride (CaCl ₂ ), alcohols, and forget-me-not with water. It may be a filling insulating material that maintains zero or zero images.

The melted material heat insulating layer has a spiral pipe connected from the inner container therein, and the spiral pipe has at least one of a liquid state and a gaseous state stored in the inner container flowing therein, and the melted material heat insulating material Can be frozen.

The cryogenic material may be a cryogenic liquid at least one of liquid hydrogen, liquid helium, LNG, and liquid nitrogen.

When the fusion material insulating material using the heat of fusion configured inside the outer container is frozen below zero, a solid insulating layer configured to prevent moisture condensation or condensation on the outer wall of the outer container may be further included.

According to embodiments of the present invention, an ultra-low temperature liquid using heat of fusion to prevent evaporation loss due to heat intrusion from the outside by applying a fusion material insulation layer in which a space part is formed on at least a part of the inner wall of the outer container and is filled with the fusion material insulation member. Storage tanks can be provided.

1 is a schematic diagram for explaining a conventional cryogenic storage tank.
2 is a schematic diagram illustrating a cryogenic storage tank using heat of fusion according to an embodiment of the present invention.
3 is a view showing a cross section of a cryogenic storage tank using heat of fusion according to an embodiment of the present invention.
4 is a schematic diagram illustrating a cryogenic storage tank using heat of fusion according to another embodiment of the present invention.

Hereinafter, embodiments of the present invention will be described with reference to the accompanying drawings. However, the described embodiments may be modified in various forms, and the scope of the present invention is not limited by the embodiments described below. In addition, various embodiments are provided to more completely explain the present invention to those of ordinary skill in the art. In the drawings, the shapes and sizes of elements may be exaggerated for clearer explanation.

The embodiments of the present invention below may provide a cryogenic liquid storage tank using heat of fusion, and in particular, by using the heat of fusion of the fusion material including the heat-insulating layer of the fusion material on the inner wall of the outer container, It is possible to provide a cryogenic storage tank that prevents evaporation loss of stored liquid.

The type of the cryogenic storage tank providing the insulating layer according to the embodiments of the present invention can be applied to a large storage tank, a tank lorry, a transportation tank for a ship, a storage tank for a liquid filling station, a small tank for a vehicle, etc., and the stored cryogenic liquid is liquid hydrogen. , Liquid helium, LNG, liquid nitrogen, etc.

2 is a schematic diagram illustrating a cryogenic storage tank using heat of fusion according to an embodiment of the present invention. And Figure 3 is a view showing a cross-section of a cryogenic storage tank using the heat of fusion according to an embodiment of the present invention. Here, FIG. 2 shows a cross section cut in the length (vertical) direction of a cryogenic storage tank using heat of fusion, and FIG. 3 may show a cross section cut in the horizontal direction of the cryogenic storage tank using heat of fusion.

2 and 3, the cryogenic storage tank 100 using heat of fusion according to an embodiment has a dual structure of an outer container 110 and an inner container 120, and the outer container 110 and the inner A heat insulating layer 130 may be formed in the space between the containers 120 and filled with a heat insulating material such as high vacuum or perlite.

In addition, a fused material insulating layer 140 may be formed on the inner wall of the outer container 110 with a fused material insulating material 160 filled therein. A spiral pipe 150 through which the cryogenic liquid 170 or cryogenic gas 180 stored in the inner container 120 flows may be provided inside the molten material insulating layer 140.

Each configuration of the cryogenic storage tank 100 using heat of fusion according to an embodiment will be described in more detail below.

The cryogenic storage tank 100 using heat of fusion according to an embodiment may include an outer container 110, an inner container 120, a heat insulating layer 130, and a heat insulating layer 140 of a melted material. In addition, according to an embodiment, the cryogenic storage tank 100 using heat of fusion may further include a solid insulating layer 190.

The outer container 110 has a cylindrical shape, and the inner container 120 having a cylindrical shape may be spaced apart from each other and accommodated in the outer container 110. The outer container 110 and the inner container 120 may be formed in a cylindrical shape, but the shape is not limited. Here, it will be described in more detail as an example that the outer container 110 and the inner container 120 is made of a cylindrical shape.

The inner container 120 may store a material in a cryogenic state therein. For example, the inner container 120 may store various cryogenic and low temperature liquids such as liquid hydrogen, liquid helium, LNG, liquid nitrogen, liquid oxygen, and liquid argon.

The insulating layer 130 may be filled with a high vacuum or powder insulating material in a space between the outer container 110 and the inner container 120 configured to be spaced apart from each other.

As an example, the heat insulating layer 130 may be filled and maintained in a high vacuum state in a space between the outer container 110 and the inner container 120. Here, 10 ^-5 Torr is applied to the high vacuum heat insulating layer, and conduction and convective heat transfer are greatly reduced, resulting in a very high heat insulation effect.

As another example, the heat insulating layer 130 may be filled with a space portion between the outer container 110 and the inner container 120 with an insulating material such as perlite powder. At this time, the insulating layer 130 may be vacuumed after filling a powder insulating material such as pearlite powder. For example, the insulating layer 130 may be subjected to vacuum insulation of 10 ^-2 Torr after the pearlite powder is filled. In this way, not only pearlite powder, but also a urethane block and a radiation heat shielding agent are required to form a high-efficiency storage tank with greatly improved insulation effect.

The melted material heat insulating layer 140 may be filled with a melted material heat insulating material 160 by forming a space in at least a part of the inner side of the outer container 110. More specifically, the fusion material insulation layer 140 may be filled with a fusion material insulation material 160, that is, a brine 160 by forming a cylindrical space by welding on the inner wall of the outer container 110.

The melted material insulating layer 140 is to apply a melted material insulating material 160 such as brine, and the brine is frozen by the cryogenic liquid 170 or the cryogenic gas 180 of the inner container 120, and the frozen brine is externally It is melted by the inflow of heat, so that heat transfer to the inner container 120 is greatly reduced, so that the heat insulation effect may be very large. Meanwhile, the cryogenic liquid 170 and the cryogenic gas 180 may be included in the material of the cryogenic state mentioned above.

Here, brine is a medium that circulates outside the refrigeration system and indirectly transports heat, ethylene glycol (Ethylene Glycol, HO(CH ₂ ) ₂ OH), propylene glycol (Propylene Glycol, C ₃ H ₈ O ₂ ) , Calcium chloride (CaCl ₂ ), sodium chloride (NaCl), magnesium chloride (MgCl ₂ ), alcohols, forget-me-nots, etc. can be mixed with water to maintain a freezing temperature of zero or one image.

The melted material insulating layer 140 may have a spiral pipe connected from the inner container 120 therein. The spiral pipe may be formed in a spiral shape along the cylindrical space portion of the molten material insulating layer 140, and at least one of a liquid state and a gaseous state stored in the inner container 120 is contained in a cryogenic state. It can flow and freeze the melted material insulation 160.

The solid heat insulating layer 190 may be configured to prevent moisture condensation or condensation on the outer wall of the outer container 110 when the melting material insulating material 160 using the heat of fusion configured inside the outer container 110 is frozen below zero. For example, the solid insulation layer 190 may be made of a solid insulation material such as urethane foam and styrene foam. In addition, the solid insulation layer 190 can be applied to various insulation materials such as urethane foam and styrene foam, as well as anara grass wool, vacuum panel, and Becklike.

The operation of the cryogenic storage tank 100 using heat of fusion according to an embodiment of the present invention will be described below as an example. Here, the cryogenic storage tank will be described in more detail by selecting the temperature of liquid hydrogen of -253°C, which is a typical cryogenic liquid 170, and brine, which is the melting material insulation 160, as -10°C.

Brine, which is the melting material insulation 160, may be filled in the molten material insulation layer 140 configured on the inner wall of the outer container 110, and the molten material insulation layer 140 may have a spiral pipe connected from the inner container 120. have.

Accordingly, the ultra-low temperature liquid 170 stored in the inner container 120, the liquid hydrogen 170 at -253°C or the evaporated gaseous hydrogen 180 at -150°C, is a spiral pipe 150 installed on the fusion material insulation layer 140 ), the brine is frozen at -10℃ as it is discharged.

At this time, the cryogenic substance flowing through the spiral pipe 150 may be a liquid cryogenic liquid 170 or a gas cryogenic gas 180. Even when the fluid is not discharged, the evaporated cryogenic gas 180 Thus, the brine can be kept frozen.

Frozen brine is in a frozen solid state, which is an equilibrium state, and when the inflow of heat from the outside increases and the equilibrium is broken, it gradually melts and becomes a liquid state while inhaling external heat. During this liquefaction, that is, melting, the amount of heat equal to the heat of fusion is not transferred to the inner container 120.

The liquid brine is frozen again by the evaporated cryogenic gas 180 or frozen by the discharged cryogenic liquid 170 repeatedly, thereby greatly increasing the heat insulation effect.

When the temperature of the brine is set to below zero, a solid insulating material 190 on the outer wall is used to prevent condensation or condensation of moisture on the outer wall of the outer container 110, and various types of urethane foam, grass wool, vacuum panels, beklike (phenol), etc. Insulation can be installed.

The freezing temperature of the brine may be variously configured according to the concentration of the brine material described above. Representatively, looking at the freezing temperature of ethylene glycol (EG), when the mixing ratio of EG:water is 36%:64%, it is -10°C, 44%:56% is -20°C, 50%:50% is -30 Becomes ℃. At this time, the heat of fusion of brine with a mixing ratio of 36%:64% is 64.7 kcal per 1 kg. In other words, 1kg of brine melts and liquefies 64.7 kcal of heat introduced from the outside to block heat.

The outer container 110, the inner container 120, the insulating layer 130 filled with a high vacuum or powder insulating material, and the melted material insulating layer 140 may form one unit. A plurality of the above units may be formed, and may be vertically or horizontally coupled to each other to form a cryogenic storage tank.

Meanwhile, in the case of liquid hydrogen in the conventional thermal insulation method, since the cryogenic liquid 170 has a very low temperature of -253° C., there is a problem in that heat flowing into the inner container 120 from the outside cannot be effectively blocked. In addition, in the case of the conventional method of applying the phase change cryogenic liquid 170, when the temperature of the storage tank reaches room temperature, all of the phase change liquid vaporizes and the pressure rises rapidly along with the expansion of the volume, leading to the risk of the formation of ultra-high pressure. You will have the problem.

According to embodiments of the present invention, a space part is formed on at least a part of the inner wall of the outer container 110 to prevent evaporation loss due to heat intrusion from the outside by applying the fusion material insulation layer 140 filled with the fusion material insulation member. can do.

4 is a schematic diagram illustrating a cryogenic storage tank using heat of fusion according to another embodiment of the present invention.

4, a cryogenic storage tank using heat of fusion according to another embodiment of the present invention is a cryogenic storage tank in which an insulating layer of a fused material is separated.

The cryogenic storage tank 200 using heat of fusion according to another embodiment has a dual structure of the outer container 210 and the inner container 220, and has a high vacuum in the space between the outer container 210 and the inner container 220. Or, a thermal insulation layer 230 may be formed in which powder insulation such as pearlite is filled.

In addition, a melted material insulating layer 240 filled with a melted material insulating material 260 may be formed in a space between the outer container 210 and the inner container 100. Here, the melted material insulating layer 240 may be configured as an independent container without contacting the inner side of the outer container 210 or the outer side of the inner container.

A spiral pipe 250 through which the cryogenic liquid 270 or the cryogenic gas 280 stored in the inner container 220 flows may be provided inside the molten material insulating layer 240. Accordingly, the low-temperature melting layer is separated from the outer container 210 so that moisture condensation on the outer wall of the outer container 210 does not occur.

The cryogenic storage tank 200 using heat of fusion according to this other embodiment has some differences in the structure of the cryogenic storage tank using heat of fusion according to the exemplary embodiment described in FIGS. 2 and 3 and the heat insulating layer of the fusion material. Each configuration of the cryogenic storage tank 200 using heat of fusion according to another embodiment will be described in more detail below, for example.

The cryogenic storage tank 200 using heat of fusion according to another embodiment of the present invention may include an outer container 210, an inner container, a fusion material insulating layer 240, and an insulating layer filled with a high vacuum powder insulating material. It may further include a solid heat insulating layer 290 according to.

The outer container 210 has a cylindrical shape, and the inner container 220 having a cylindrical shape may be spaced apart from each other and accommodated in the outer container 210. The outer container 210 and the inner container 220 may be formed in a cylindrical shape, but the shape is not limited. Here, it will be described in more detail as an example that the outer container 210 and the inner container 220 is made of a cylindrical shape.

The inner container 220 may store a material in a cryogenic state therein. Here, the material in the cryogenic state may be a cryogenic liquid 270 at least one of liquid hydrogen, liquid helium, LNG, and liquid nitrogen.

The melted material insulating layer 240 is disposed in a space between the outer container 210 and the inner container 220 and is disposed at a predetermined distance apart from the outer container 210 and the inner container 220, and the melted material heat insulating material 260 ) Can be filled. More specifically, the molten material insulation layer 240 is composed of a donut-shaped cylinder accommodating an internal container therein, and a space portion is formed inside the donut-shaped cylinder to fill the molten material insulation 260, that is, brine. Can be.

The melted material insulating layer 240 is to apply a melted material insulating material 260 such as brine, and the brine is frozen by the cryogenic liquid 270 or the cryogenic gas 280 of the inner container 220, and the frozen brine is externally It is melted by the heat inflow of heat, and heat transfer to the inner container is greatly reduced, so that the insulation effect can be very large.

Here, brine is frozen by mixing ethylene glycol (Ethylene Glycol, HO(CH ₂ ) ₂ OH), propylene glycol (Propylene Glycol, C ₃ H ₈ O ₂ ), calcium chloride (CaCl ₂ ), alcohols and forget-me-nots with water. It may be a filling insulation that keeps the temperature at zero or an image.

The melted material insulating layer 240 may have a spiral pipe 250 connected from an inner container therein. The spiral pipe 250 may be formed in a spiral shape along the cylindrical space portion of the molten material insulating layer 240, and at least one of a liquid state and a gas state stored in the inner container 220 at least one of the cryogenic state The materials 270 and 280 of may flow and freeze the melted material insulation 260.

In addition, the heat insulating layer 230 includes a high vacuum or powder insulating material such as perlite powder in the space between the outer container 210 and the heat insulating layer 240 and the heat insulating layer 240 and the inner container. Can be filled. In this case, the heat insulating layer 230 may be maintained in a vacuum state after filling a powder insulating material such as pearlite powder.

In addition, a solid heat insulating layer 290 may be further included according to an embodiment. The solid heat insulating layer 290 may be configured to prevent moisture condensation or condensation on the outer wall of the outer container 210 when the melting material insulating material 260 using the heat of fusion configured inside the outer container 210 is frozen below zero. For example, the solid insulating layer 290 may be made of a solid insulating material such as urethane foam and styrene foam.

As described above, according to the embodiments, a space part may be made inside the outer container, and the space may be filled with a fusion material insulation material to enable heat insulation. Accordingly, the daily evaporation amount is reduced by 20% to 30% or more, and when the filling amount of the fused material insulation material is increased, the reduction amount is also increased.

In particular, in the case of a liquid hydrogen storage tank having an extremely low liquid storage temperature of -253°C, the heat insulation effect can be greatly improved by effectively reducing the problem of evaporation caused by continuous heat inflow even with the conventional thermal insulation technology.

The cryogenic storage tank according to the embodiments of the present invention can be applied to a vertical cryogenic storage tank and a horizontal cryogenic storage tank, and various kinds of liquid hydrogen, liquid helium, LNG, liquid nitrogen, liquid oxygen, liquid argon storage tanks, etc. It can be used as a cryogenic and low temperature fluid tank lorry, a fuel tank for vehicles, and especially as a medium-large tank for liquid hydrogen transportation and LNG bunkering for marine use.

In the above, when a component is referred to as being "connected" or "connected" to another component, it may be directly connected or connected to the other component, but other components may exist in the middle. It should be understood that there is. On the other hand, when a component is referred to as being "directly connected" or "directly connected" to another component, it should be understood that there is no other component in the middle.

The terms used in the present specification are only used to describe specific embodiments, and are not intended to limit the present invention. Singular expressions include plural expressions unless the context clearly indicates otherwise. In this specification, terms such as "comprise" or "have" are intended to designate the presence of features, numbers, steps, actions, components, parts, or a combination thereof described in the specification, but one or more other features. It is to be understood that the presence or addition of elements or numbers, steps, actions, components, parts, or combinations thereof, does not preclude in advance.

Terms such as first and second may be used to describe various components, but the components should not be limited by the terms. These terms are used only for the purpose of distinguishing one component from another component.

In addition, terms such as "... unit" and "... module" described in the specification mean a unit that processes at least one function or operation, which may be implemented by hardware or software or a combination of hardware and software.

In addition, components of the embodiments described with reference to each drawing are not limited to the corresponding embodiments, and may be implemented to be included in other embodiments within the scope of maintaining the technical spirit of the present invention. Even if the description is omitted, it is natural that a plurality of embodiments may be implemented again as a unified embodiment.

In addition, in the description with reference to the accompanying drawings, the same or related reference numerals are assigned to the same elements regardless of the reference numerals, and redundant descriptions thereof will be omitted. In describing the present invention, when it is determined that a detailed description of related known technologies may unnecessarily obscure the subject matter of the present invention, a detailed description thereof will be omitted.

As described above, although the embodiments have been described by the limited embodiments and drawings, various modifications and variations are possible from the above description by those of ordinary skill in the art. For example, the described techniques are performed in a different order from the described method, and/or components such as a system, structure, device, circuit, etc. described are combined or combined in a form different from the described method, or other components Alternatively, even if substituted or substituted by an equivalent, an appropriate result can be achieved.

Therefore, other implementations, other embodiments, and equivalents to the claims fall within the scope of the following claims.

100, 200: cryogenic storage tank
110, 210: outer container
120, 220: inner container
130, 230: insulation layer
140, 240: melting material insulation layer
150, 250: spiral piping
160, 260: melted material insulation
170, 270: cryogenic liquid
180, 280: cryogenic gas
190, 290: solid insulation layer

Claims (5)

Outer container;
An inner container that is accommodated in the outer container by being spaced apart from each other by a predetermined interval and stores a material in a cryogenic state therein;
A heat insulating layer in which a high vacuum or powder heat insulating material is filled in the space between the outer container and the inner container; And
A fusion material insulation layer in which a space part is formed in at least a part of the inner side of the outer container to be filled with a fusion material insulation material
Including,
The fusion material heat insulating layer,
A spiral pipe connected from the inner container is formed therein, and the spiral pipe flows at least one of at least one of a liquid state and a gaseous state stored in the inner container to freeze the melted material insulation material.
Cryogenic storage tank, characterized in that. The method of claim 1,
The fusion material heat insulating layer,
A cylindrical space is formed on the inner wall of the outer container by welding, so that brine is filled
Cryogenic storage tank, characterized in that. The method of claim 2,
The brine,
Mixing ethylene glycol (Ethylene Glycol, HO(CH ₂ ) ₂ OH), propylene glycol (C ₃ H ₈ O ₂ ), calcium chloride (CaCl ₂ ), alcohols and forget-me-nots with water to keep the freezing temperature to zero With filling insulation maintained by
Cryogenic storage tank, characterized in that. delete Outer container;
An inner container that is accommodated in the outer container by being spaced apart from each other by a predetermined interval and stores a material in a cryogenic state therein;
A melted material heat insulating layer disposed in a space between the outer container and the inner container and spaced apart from the outer container and the inner container by a predetermined distance, and filled with a melted material heat insulating material therein; And
A heat insulating layer in which a high vacuum or powder heat insulating material is filled in the space between the outer container and the heat insulating layer of the melted material and the space between the heat insulating layer of the melted material and the inner container
Including,
The fusion material heat insulating layer,
A spiral pipe connected from the inner container is formed therein, and the spiral pipe flows at least one of at least one of a liquid state and a gaseous state stored in the inner container to freeze the melted material insulation material.
Cryogenic storage tank, characterized in that.

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