JP2012057803A - Low-temperature fluid storage tank - Google Patents

Abstract

PROBLEM TO BE SOLVED: To reduce vaporization (boil-off) of a low-temperature fluid in a low-temperature fluid storage tank.SOLUTION: The low-temperature fluid storage tank 110 has a low-temperature fluid storage tank 111 for storing a solid-liquid two-phase fluid of the low temperature and a vacuum heat insulation tank for storing this low-temperature fluid storage tank 111. A partition plate 112 for vertically dividing an inside space of the low-temperature fluid storage tank 111 into two parts and manufactured with a heat insulation material of small heat conductivity as a material, is arranged in a substantially intermediate part in the height direction of the low-temperature fluid storage tank 111, and a plurality of communicating parts 113 penetrating in the plate thickness direction are formed in a peripheral edge part of this partition plate 112.

Description

  The present invention relates to a cryogenic fluid storage tank for storing a low-temperature solid-liquid two-phase fluid.

  Conventionally, as a low temperature fluid storage tank for storing a low temperature fluid (for example, liquid hydrogen or liquid nitrogen), a tank having a low temperature fluid storage tank therein is known (for example, Non-Patent Document 1). reference).

W PESCHKA, “The future cryofuel in internal combustion engines” (UK), Into J Hydrogen Energy (Int. J. Hydrogen Energy), Vol23, No. 1, p. 27-43, 1998

  In such a cryogenic fluid storage tank, a liquid cryogenic fluid (or a mixture of a liquid cryogenic fluid and a gaseous cryogenic fluid) is stored. At this time, the temperature of the cryogenic fluid in the cryogenic fluid storage tank is, for example, about 20.3 K in the case of liquid hydrogen, and the rate at which the cryogenic fluid is vaporized (boiled off) is about 3 to 5% per day. Therefore, it has been difficult to keep the evaporation amount of the low temperature fluid lower than this.

  The present invention has been made in view of the above circumstances, and an object of the present invention is to provide a cryogenic fluid storage tank that can reduce vaporization (boil-off) of the cryogenic fluid in the cryogenic fluid storage tank.

In order to solve the above problems, the present invention employs the following means.
A cryogenic fluid storage tank according to the present invention is a cryogenic fluid storage tank comprising a cryogenic fluid storage tank in which a low-temperature solid-liquid two-phase fluid is stored, and a vacuum insulation tank in which the cryogenic fluid storage tank is accommodated. In addition, a partition plate made of a heat insulating material having a low thermal conductivity as a material is provided at an approximately middle portion in the height direction of the cryogenic fluid storage tank, and the internal space of the cryogenic fluid storage tank is divided into two vertically. In addition, a plurality of communicating portions penetrating in the thickness direction are formed on the peripheral edge of the partition plate.

  According to the cryogenic fluid storage tank according to the present invention, for example, as shown in FIG. 11, gas (for example, hydrogen gas) vaporized in the cryogenic fluid storage tank passes through the communicating portion, and the inside of the cryogenic fluid storage tank. It will rise along a wall surface, and the temperature of the wall surface of a cryogenic fluid storage tank will be lowered. Therefore, intrusion heat that enters from outside the cryogenic fluid storage tank is absorbed by the wall of the cryogenic fluid storage tank that is cooled (continuously cooled) by the vaporized gas, and heat input to the liquid phase is prevented. It becomes. In addition, the solid phase having a temperature lower than that of the liquid phase cools the liquid phase and lowers the temperature of the liquid phase. And the liquid phase whose temperature was lowered becomes difficult to evaporate. That is, the vaporization (boil-off) of the liquid phase stored in the low-temperature fluid storage tank is reduced, and the rate at which the liquid phase is vaporized (boil-off) is reduced to, for example, 1% or less per day. Can do.

  According to the present invention, there is an effect that the vaporization (boil-off) of the low temperature fluid in the low temperature fluid storage tank can be reduced.

BRIEF DESCRIPTION OF THE DRAWINGS It is a schematic block diagram of the storage tank for cryogenic fluid which concerns on 1st reference embodiment of this invention, Comprising: (a) is sectional drawing cut | disconnected along the longitudinal direction, (b) is II arrow view of (a). It is sectional drawing. It is a schematic block diagram of the cryogenic fluid storage tank according to the second reference embodiment of the present invention, it is a cross-sectional view cut along the longitudinal direction. FIG. 6 is a schematic configuration diagram of a cryogenic fluid storage tank according to a third reference embodiment of the present invention, which is a cross-sectional view cut along a longitudinal direction. It is a schematic block diagram of the storage tank for cryogenic fluid which concerns on 4th reference embodiment of this invention, Comprising: (a) is sectional drawing cut | disconnected along the longitudinal direction, (b) is IV-IV arrow view of (a). It is sectional drawing. FIG. 9 is a schematic configuration diagram of a cryogenic fluid storage tank according to a fifth reference embodiment of the present invention, which is a cross-sectional view taken along a longitudinal direction. FIG. 9 is a schematic configuration diagram of a cryogenic fluid storage tank according to a sixth reference embodiment of the present invention, which is a cross-sectional view taken along a direction orthogonal to the longitudinal direction. FIG. 10 is a schematic configuration diagram of a cryogenic fluid storage tank according to a seventh reference embodiment of the present invention, which is a cross-sectional view taken along a direction orthogonal to the longitudinal direction. FIG. 10 is a schematic configuration diagram of a cryogenic fluid storage tank according to an eighth reference embodiment of the present invention, which is a cross-sectional view taken along a direction orthogonal to the longitudinal direction. It is a schematic block diagram of the storage tank for cryogenic fluid which concerns on 9th reference embodiment of this invention, Comprising: It is sectional drawing cut along the direction orthogonal to a longitudinal direction. It is a schematic block diagram of the storage tank for cryogenic fluid which concerns on 10th reference embodiment of this invention, Comprising: It is sectional drawing cut along the direction orthogonal to a longitudinal direction. It is the figure which extracted only the cryogenic fluid storage tank of the storage tank for cryogenic fluids concerning 1st Embodiment of this invention, Comprising: It is the perspective view drawn so that the inside could be seen.

Hereinafter, a first reference embodiment of a cryogenic fluid storage tank according to the present invention will be described with reference to the drawings.
FIG. 1 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, where FIG. It is.

As shown in FIG. 1, the cryogenic fluid storage tank 10 includes a vacuum heat insulating tank 11, a cryogenic fluid storage tank 12, and a separating means 13.
The vacuum heat insulating tank 11 is a container in which the inside is evacuated and a radiation shield plate (not shown) such as a copper plate is attached (pasted) to the inner surface of the vacuum heat insulating tank 11. Contains a cryogenic fluid storage tank 12.
The cryogenic fluid storage tank 12 is a low-temperature (for example, 16K) solid-liquid two-phase fluid (for example, liquid hydrogen and slush hydrogen (slush fluid: solid hydrogen and liquid hydrogen mixed in a sherbet shape). And a mixture that is mixed with a liquid that has a higher density than liquid hydrogen and that holds a large amount of cold)), and the cryogenic fluid storage layer 12 contains a separating means 13 therein. .

The separating means 13 divides the space in the cryogenic fluid storage tank 12 into the inside and outside, and the solid-liquid two-phase fluid stored in the cryogenic fluid storage tank 12 is divided into a liquid phase (for example, liquid hydrogen) 14 and a solid phase. A mesh member made of, for example, metal (stainless steel, aluminum alloy, etc.) is separated into (for example, solid hydrogen) 15. The solid phase 15 is stored outside the separating unit 13, that is, in a space formed between the separating unit 13 and the cryogenic fluid storage tank 12, and inside the separating unit 13, that is, a cryogenic fluid storage. The liquid phase 14 is stored in a space formed in the center of the tank 10 (more specifically, the center of the cryogenic fluid storage tank 12).
The separation means 13 is configured to pass the liquid phase 14 but not the solid phase 15. Therefore, the liquid phase 14 of the solid-liquid two-phase fluid supplied from the fluid supply source (not shown) through the supply port 16 into the space formed between the separation means 13 and the cryogenic fluid storage tank 12, and What has changed from the solid phase 15 to the liquid phase 14 in the space formed between the separation means 13 and the cryogenic fluid storage tank 12 moves from the outside of the separation means 13 to the inside through the separation means 13. Become.

  According to the cryogenic fluid storage tank 10 according to the present embodiment, the solid phase 15 is stored so as to surround the liquid phase 14 in the cryogenic fluid storage tank 12. Therefore, the intrusion heat that enters from the outside of the cryogenic fluid storage tank 10 enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, and heat input to the liquid phase 14 is prevented. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 12 is reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) is, for example, 1% or less per day. Can be.

A second reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 2 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
The cryogenic fluid storage tank 20 according to the present embodiment differs from that of the first reference embodiment described above in that it includes a separating means 21 and a radiation shield plate 22 instead of the separating means 13. Since other components are the same as those of the first reference embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 1st reference embodiment mentioned above.

The separating means 21 bisects the space in the cryogenic fluid storage tank 12 to the left and right, and separates the solid-liquid two-phase fluid stored in the cryogenic fluid storage tank 12 into a liquid phase (for example, liquid hydrogen) 14 and a solid phase. A mesh member made of, for example, metal (stainless steel, aluminum alloy, etc.) is separated into (for example, solid hydrogen) 15. The solid phase 15 is stored in the right side (one side) of the separation unit 13, that is, in the space formed between the right side of the separation unit 13 and the cryogenic fluid storage tank 12, and the left side ( The liquid phase 14 is stored in the space formed between the other side), that is, the left side of the separating means 13 and the cryogenic fluid storage tank 12.
The separation means 13 is configured to pass the liquid phase 14 but not the solid phase 15. Therefore, the liquid phase 14 of the solid-liquid two-phase fluid supplied from the fluid supply source (not shown) through the supply port 16 into the space formed between the right side of the separation means 13 and the cryogenic fluid storage tank 12. In the space formed between the right side of the separating means 13 and the cryogenic fluid storage tank 12, the solid phase 15 changes to the liquid phase 14 through the separating means 21 from the right side to the left side of the separating means 13. Will move.

  The radiation shield plate 22 is a plate-like member made of, for example, aluminum or copper, and is attached (attached) to the inner surface (the ceiling surface in the present embodiment) of the cryogenic fluid storage tank 12. The radiation shield plate 22 has one end immersed in the solid phase 15 and the other end connected to the radiation shield plate 22 so that the radiation shield plate 22 and the solid phase 15 are thermally coupled (connected). The heat conducting member 23 made of, for example, aluminum or copper is provided.

  According to the cryogenic fluid storage tank 20 according to the present embodiment, intrusion heat due to radiation is transmitted to the solid phase 15 via the radiation shield plate 22 and the heat conducting member 23 and absorbed by the heat of fusion of the solid phase 15. Heat input to the liquid phase 14 is prevented. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 12 is reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) is, for example, 1% or less per day. Can be.

A third reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 3 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
The cryogenic fluid storage tank 30 according to this embodiment differs from that of the second reference embodiment described above in that it includes a radiation shield plate 31 instead of the radiation shield plate 22. Since other components are the same as those of the second reference embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 2nd reference embodiment mentioned above.

  The radiation shield plate 31 is a plate-like member made of, for example, aluminum or copper, and is attached (attached) to the inner surface (the ceiling surface and one side surface in the present embodiment) of the cryogenic fluid storage tank 12. Further, one end of the radiation shield plate 22 is configured to be immersed in the liquid phase 14.

  According to the cryogenic fluid storage tank 30 according to the present embodiment, the solid phase 15 and the liquid phase 14 are thermally coupled (connected) via the heat conducting member 23 and the radiation shield plate 31. 14 is further cooled by the solid phase 15, and the temperature of the liquid phase 14 is further lowered. Further, intrusion heat due to radiation is transmitted to the solid phase 15 through the radiation shield plate 22 and the heat conducting member 23 and absorbed by the heat of fusion of the solid phase 15 to prevent heat input to the liquid phase 14. It becomes. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 12 is further reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) can be further reduced.

A fourth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
4A and 4B are schematic configuration diagrams of a cryogenic fluid storage tank according to the present embodiment, in which FIG. It is.

As shown in FIG. 4, the cryogenic fluid storage tank 40 includes a vacuum heat insulating tank 41, a cryogenic fluid storage tank 42, and an intermediate member 43.
The inside of the vacuum heat insulating tank 41 is a vacuum, and a radiation shield plate (not shown) such as a copper plate is attached (attached) to the inner surface of the vacuum heat insulating tank 41. The cryogenic fluid storage tank 42 and the intermediate member 43 are accommodated.
The cryogenic fluid storage tank 42 has a low-temperature (for example, 16K) solid-liquid two-phase fluid (for example, liquid hydrogen and slush hydrogen (slush fluid: solid hydrogen and liquid hydrogen mixed in a sherbet shape). Yes, it has a higher density than liquid hydrogen and has a large amount of cold to be stored).

  The intermediate member 43 is a hollow cylindrical member having an inner diameter larger than the outer diameter of the cryogenic fluid storage tank 42 and both ends thereof being open ends. A storage tank 42 is accommodated. The intermediate member 43 and the cryogenic fluid storage tank 42 are arranged such that the bottom surface on the inner peripheral side of the intermediate member 43 and the bottom surface on the outer peripheral side of the cryogenic fluid storage tank 42 are in line contact (that is, the inside of the intermediate member 43). A joining portion between the bottom surface on the circumferential side and the bottom surface on the outer circumferential side of the cryogenic fluid storage tank 42 is joined (coupled) so as to form a single line (in this embodiment, a straight line). Further, the intermediate member 43 and the cryogenic fluid storage tank 42 connect (couple) the upper surface (ceiling surface) on the inner peripheral side of the intermediate member 43 and the upper surface (ceiling surface) on the outer peripheral side of the cryogenic fluid storage tank 42. They are fixed to each other via a plurality of (two in this embodiment) fixing members 44 (for example, rod-shaped members having a circular shape in cross section). The intermediate member 43 and the cryogenic fluid storage tank 42 are connected to (coupled to) a plurality of (this embodiment) the outer peripheral side surface of the intermediate member 43 and the inner peripheral upper surface (ceiling surface) of the vacuum heat insulating tank 41 (this embodiment). It is attached to the inside of the vacuum heat insulating tank 41 via four support members (for example, rod-shaped members having a circular shape in cross section) 45 in the form.

  According to the cryogenic fluid storage tank 40 according to the present embodiment, the intrusion heat is generated in the cryogenic fluid storage tank 42 via the support member 45, the intermediate member 43, and the junction between the intermediate member 43 and the cryogenic fluid storage tank 42. It will be transmitted to the bottom. Therefore, the intrusion heat entering from the outside of the cryogenic fluid storage tank 40 enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, and heat input to the liquid phase 14 is prevented. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 42 is reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) is, for example, 1% or less per day. Can be.

A fifth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 5 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
In the cryogenic fluid storage tank 50 according to the present embodiment, the bottom surface on the inner circumferential side of the intermediate member 43 and the bottom surface on the outer circumferential side of the cryogenic fluid storage tank 42 are joined via a high thermal conductive member 51 such as copper, for example. It is different from that of the fourth reference embodiment described above in that it is (coupled). Since other components are the same as those of the above-described fourth reference embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 4th reference embodiment mentioned above.

  According to the cryogenic fluid storage tank 50 according to the present embodiment, the intrusion heat transmitted to the high heat conduction member 51 via the support member 45 and the intermediate member 43 is transferred to the bottom of the low temperature fluid storage tank 42 by the high heat conduction member 51. It is dispersed (diffused) uniformly (uniformly). Therefore, the intrusion heat entering from outside the cryogenic fluid storage tank 50 uniformly enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, further preventing heat input to the liquid phase 14. . Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 42 is further reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) can be further reduced.

A sixth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 6 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along a direction orthogonal to the longitudinal direction.

As shown in FIG. 6, the cryogenic fluid storage tank 60 includes a vacuum heat insulating tank 61 and a cryogenic fluid storage tank 62.
The vacuum heat insulation tank 61 is a container in which the inside is evacuated and a radiation shield plate (not shown) such as a copper plate is attached (pasted) to the inner surface of the vacuum heat insulation tank 61. Contains a cryogenic fluid storage tank 62.
The cryogenic fluid storage tank 62 is a low-temperature (for example, 16K) solid-liquid two-phase fluid (for example, liquid hydrogen and slush hydrogen (slush fluid: solid hydrogen and liquid hydrogen mixed in a sherbet shape). Yes, it has a higher density than liquid hydrogen and has a large amount of cold to be stored). In addition, a heat insulating material 63 having a low thermal conductivity is attached (attached) to the upper surface (ceiling surface) and the side surface of the inner surface of the cryogenic fluid storage tank 62 excluding the bottom surface.

  According to the cryogenic fluid storage tank 60 according to the present embodiment, the intrusion heat enters only from the bottom surface of the cryogenic fluid storage tank 62 and is prevented (prevented) from entering from the top and side surfaces of the cryogenic fluid storage tank 62. It will be. Therefore, the intrusion heat that enters from the outside of the cryogenic fluid storage tank 60 enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, and heat input to the liquid phase 14 is prevented. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 62 is reduced, and the ratio at which the liquid phase 14 is vaporized (boil-off) is reduced to, for example, 1% or less per day. Can be.

A seventh reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 7 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
The cryogenic fluid storage tank 70 according to the present embodiment is the sixth reference implementation described above in that a high thermal conductive member 71 such as copper is attached (pasted) to the entire outer surface of the cryogenic fluid storage tank 62. Different from that of form. Since other components are the same as those of the sixth reference embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 6th reference embodiment mentioned above.

  According to the cryogenic fluid storage tank 70 according to the present embodiment, the intrusion heat transmitted to the high heat conduction member 71 is smoothly guided to the bottom of the low temperature fluid storage tank 62 by the high heat conduction member 71 and the low temperature fluid storage tank. It is dispersed (diffused) uniformly (uniformly) at the bottom of 62. Therefore, the intrusion heat that enters from outside the cryogenic fluid storage tank 70 uniformly enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, further preventing heat input to the liquid phase 14. . Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 62 is further reduced, whereby the rate at which the liquid phase 14 is vaporized (boil-off) can be further reduced.

An eighth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 8 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along a direction orthogonal to the longitudinal direction.

As shown in FIG. 8, the cryogenic fluid storage tank 80 includes a vacuum heat insulating tank 81 and a cryogenic fluid storage tank 82.
The vacuum heat insulation tank 81 is a container in which the inside is evacuated and a radiation shield plate (not shown) such as a copper plate is attached (pasted) to the inner surface of the vacuum heat insulation tank 81. Contains a cryogenic fluid storage tank 82.
The cryogenic fluid storage tank 82 has a low temperature (for example, 16K) solid-liquid two-phase fluid (for example, liquid hydrogen and slush hydrogen (slush fluid: solid hydrogen and liquid hydrogen mixed in a sherbet shape). Yes, it has a higher density than liquid hydrogen and has a large amount of cold to be stored). A metal partition plate 83 that separates the space in the cryogenic fluid storage tank 82 along the side surface is attached to the inner surface of the cryogenic fluid storage tank 82. A vaporized gas (for example, hydrogen gas) 84 accumulates in a space formed by the partition plate 83.

  According to the cryogenic fluid storage tank 80 according to the present embodiment, the vaporized gas serves as a heat insulating material, preventing (preventing) heat from entering the liquid phase 14 from the side surface of the cryogenic fluid storage tank 82, Heat enters only from the bottom surface of the fluid storage tank 82. Therefore, the intrusion heat that enters from outside the cryogenic fluid storage tank 80 enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, and heat input to the liquid phase 14 is prevented. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 82 is reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) is, for example, 1% or less per day. Can be.

A ninth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 9 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
The cryogenic fluid storage tank 90 according to the present embodiment is the eighth reference embodiment described above in that a partition plate 92 made of a heat insulating material having a low thermal conductivity is provided instead of the partition plate 83. Different from that of form. Since other components are the same as those of the above-described eighth reference embodiment, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 8th reference embodiment mentioned above.

According to the cryogenic fluid storage tank 90 according to the present embodiment, the penetration of heat from the partition plate 92 into the liquid phase 14 is prevented (prevented), and the liquid phase 14 stored in the cryogenic fluid storage tank 82 is vaporized ( (Boil-off) is further reduced, so that the rate at which the liquid phase 14 is vaporized (boil-off) can be further reduced.
In this embodiment, instead of the partition plate 92, the entire surface of the partition plate 83 described in the eighth reference embodiment (the surface in contact with the liquid phase 14 and the solid phase 15) has a low thermal conductivity. It is also possible to adopt (apply) a heat insulating material attached (pasted).

A tenth reference embodiment of the cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 10 is a schematic configuration diagram of a cryogenic fluid storage tank according to the present embodiment, which is a cross-sectional view taken along the longitudinal direction.
In the cryogenic fluid storage tank 100 according to the present embodiment, a high thermal conductive member 101 such as copper is attached (pasted) to the bottom surface and the side surface of the cryogenic fluid storage tank 82 excluding the top surface (ceiling surface). This is different from that of the ninth reference embodiment described above. Since other components are the same as those of the ninth reference embodiment described above, description of these components is omitted here.
In addition, the same code | symbol is attached | subjected to the member same as 9th reference embodiment mentioned above.

  According to the cryogenic fluid storage tank 100 according to the present embodiment, the intrusion heat transferred to the high heat conduction member 101 is smoothly guided to the bottom of the low temperature fluid storage tank 82 by the high heat conduction member 101 and the low temperature fluid storage tank. It is dispersed (diffused) uniformly (uniformly) at the bottom of 82. Therefore, the intrusion heat that enters from outside the cryogenic fluid storage tank 100 uniformly enters the solid phase 15 and is absorbed by the heat of fusion of the solid phase 15, further preventing heat input to the liquid phase 14. . Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 82 is further reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) can be further reduced.

A first embodiment of a cryogenic fluid storage tank according to the present invention will be described with reference to FIG.
FIG. 11 is a view showing only the cryogenic fluid storage tank of the cryogenic fluid storage tank according to the present embodiment, and is a perspective view drawn so that the inside can be seen.

As shown in FIG. 11, the cryogenic fluid storage tank 110 has a vacuum insulation tank (not shown) and a cryogenic fluid storage tank 111.
The vacuum heat insulation tank is a container in which the inside is evacuated and a radiation shield plate (not shown) such as a copper plate is attached (pasted) to the inner surface of the vacuum heat insulation tank. The cryogenic fluid storage tank 111 is accommodated.
The cryogenic fluid storage tank 111 has a low-temperature (for example, 16K) solid-liquid two-phase fluid (for example, liquid hydrogen and slush hydrogen (slush fluid: solid hydrogen and liquid hydrogen mixed in a sherbet shape). Yes, it has a higher density than liquid hydrogen and has a large amount of cold to be stored). Further, a partition plate made of a heat insulating material having a low thermal conductivity as a material that bisects the space in the cryogenic fluid storage tank 111 in the upper and lower directions at a substantially intermediate portion in the height direction of the cryogenic fluid storage tank 111. 112 is attached. In addition, a plurality of (in this embodiment, 12) communication portions 113 (in this embodiment, radially inward from the periphery and cut along the circumferential direction are formed on the peripheral portion of the partition plate 112 along the circumferential direction. A notch is formed.
The communication portion 113 is large enough to allow a solid-liquid two-phase fluid supplied from a supply port (not shown) to accumulate at the bottom of the low-temperature fluid storage tank 111 through the communication portion 113. .

According to the cryogenic fluid storage tank 110 according to the present embodiment, gas (for example, hydrogen gas) vaporized in the cryogenic fluid storage tank 111 passes through the communication portion 113 and along the inner wall surface of the cryogenic fluid storage tank 111. As a result, the temperature of the wall surface of the cryogenic fluid storage tank 111 is lowered. Therefore, the intrusion heat that enters from the outside of the cryogenic fluid storage tank 110 is absorbed by the wall surface of the cryogenic fluid storage tank 111 that is cooled (continuously cooled) by the vaporized gas, and heat input to the liquid phase 14 is prevented. Will be. Further, the solid phase 15 having a temperature lower than that of the liquid phase 14 cools the liquid phase 14 and lowers the temperature of the liquid phase 14. Then, the liquid phase 14 whose temperature has been lowered is less likely to evaporate. That is, the vaporization (boil-off) of the liquid phase 14 stored in the low-temperature fluid storage tank 111 is reduced, and thereby the rate at which the liquid phase 14 is vaporized (boil-off) is, for example, 1% or less per day. Can be.
In addition, the communication part 103 is not limited to a notch as demonstrated in this embodiment, It can also be made into the round hole penetrated in a plate | board thickness direction.

DESCRIPTION OF SYMBOLS 10 Storage tank for low temperature fluids 11 Vacuum insulation tank 12 Low temperature fluid storage tank 13 Separation means 14 Liquid phase 15 Solid phase 20 Low temperature fluid storage tank 21 Separation means 22 Radiation shield plate 23 Heat conduction member 30 Low temperature fluid storage tank 31 Radiation shield Plate 40 Low temperature fluid storage tank 41 Vacuum insulation tank 42 Low temperature fluid storage tank 43 Intermediate member 45 Support member 50 Low temperature fluid storage tank 51 High heat conduction member 60 Low temperature fluid storage tank 61 Vacuum insulation tank 62 Low temperature fluid storage tank 63 Thermal insulation material 70 Low Temperature Fluid Storage Tank 71 High Thermal Conductive Member 80 Low Temperature Fluid Storage Tank 81 Vacuum Thermal Insulation Tank 82 Low Temperature Fluid Storage Tank 83 Partition Plate 90 Low Temperature Fluid Storage Tank 91 Partition Plate 100 Low Temperature Fluid Storage Tank 101 High Thermal Conductivity Member 110 Low Temperature Fluid Storage tank 111 cryogenic fluid storage tank 112 partition plate 13 communicating portion

Claims (1)

A cryogenic fluid storage tank comprising a cryogenic fluid storage tank in which a low-temperature solid-liquid two-phase fluid is stored and a vacuum insulation tank in which the cryogenic fluid storage tank is accommodated,
A partition plate made of a heat insulating material having a small thermal conductivity is provided at an approximately middle portion in the height direction of the cryogenic fluid storage tank, and the internal space of the cryogenic fluid storage tank is divided into two parts up and down. And the storage tank for low-temperature fluids characterized by the several peripheral part penetrated in the plate | board thickness direction formed in the peripheral part of this partition plate.

Images