WO2020202577A1 - 液化ガス貯留構造および液化ガス運搬船 - Google Patents

液化ガス貯留構造および液化ガス運搬船 Download PDF

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Publication number
WO2020202577A1
WO2020202577A1 PCT/JP2019/015226 JP2019015226W WO2020202577A1 WO 2020202577 A1 WO2020202577 A1 WO 2020202577A1 JP 2019015226 W JP2019015226 W JP 2019015226W WO 2020202577 A1 WO2020202577 A1 WO 2020202577A1
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WIPO (PCT)
Prior art keywords
tank
support member
liquefied gas
outer tank
inner tank
Prior art date
Application number
PCT/JP2019/015226
Other languages
English (en)
French (fr)
Inventor
川本　英樹
今井　達也
啓介 間城
健太郎 奥村
遼平 藤村
田中　一雄
大輔 神▲崎▼
洋輝 中土
村岸　治
好伸 坂野
Original Assignee
川崎重工業株式会社
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by 川崎重工業株式会社 filed Critical 川崎重工業株式会社
Priority to JP2021511073A priority Critical patent/JPWO2020202577A1/ja
Priority to EP19922629.1A priority patent/EP3951244A4/en
Priority to KR1020217033718A priority patent/KR20210141618A/ko
Priority to PCT/JP2019/015226 priority patent/WO2020202577A1/ja
Priority to CN201980094617.5A priority patent/CN113825942B/zh
Publication of WO2020202577A1 publication Critical patent/WO2020202577A1/ja

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    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/08—Mounting arrangements for vessels
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0128—Shape spherical or elliptical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/05—Size
    • F17C2201/052—Size large (>1000 m3)
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/01—Reinforcing or suspension means
    • F17C2203/011—Reinforcing means
    • F17C2203/012—Reinforcing means on or in the wall, e.g. ribs
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0308—Radiation shield
    • F17C2203/032—Multi-sheet layers
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0329—Foam
    • F17C2203/0333—Polyurethane
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0304—Thermal insulations by solid means
    • F17C2203/0345—Fibres
    • F17C2203/035—Glass wool
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/03—Thermal insulations
    • F17C2203/0391—Thermal insulations by vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0629—Two walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0612—Wall structures
    • F17C2203/0626—Multiple walls
    • F17C2203/0631—Three or more walls
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0646—Aluminium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
    • F17C2205/01—Mounting arrangements
    • F17C2205/0153—Details of mounting arrangements
    • F17C2205/0192—Details of mounting arrangements with external bearing means
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/012—Hydrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/016—Noble gases (Ar, Kr, Xe)
    • F17C2221/017—Helium
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0134—Applications for fluid transport or storage placed above the ground
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02E—REDUCTION OF GREENHOUSE GAS [GHG] EMISSIONS, RELATED TO ENERGY GENERATION, TRANSMISSION OR DISTRIBUTION
    • Y02E60/00—Enabling technologies; Technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02E60/30—Hydrogen technology
    • Y02E60/32—Hydrogen storage

Definitions

  • the present invention relates to a liquefied gas storage structure and a liquefied gas carrier including the liquefied gas storage structure.
  • Patent Document 1 discloses a liquefied hydrogen carrier in which a spherical tank for storing liquefied hydrogen is mounted on a hull.
  • the tank In this liquefied hydrogen carrier, the tank is supported by a tubular skirt that rises from the floor of the hull. In addition, the outer surface of the tank is entirely covered with an insulating layer.
  • Patent Document 1 has a problem that heat penetrates into the tank from the floor surface through the skirt.
  • an object of the present invention is to provide a liquefied gas storage structure capable of reducing heat intrusion from the floor surface into the tank, and a liquefied gas carrier including the liquefied gas storage structure.
  • the liquefied gas storage structure from one aspect of the present invention includes a spherical inner tank for storing the liquefied gas, a double-shell tank including an outer tank for accommodating the inner tank, and a floor. It is provided with a first support member that stands up from the surface and supports the outer tank, and a second support member that stands up from the inner surface of the outer tank and supports the inner tank at a position different from that of the first support member. It is characterized by.
  • the liquefied gas carrier of the present invention includes a hull, a spherical inner tank for storing liquefied gas, a double-shell tank including an outer tank for accommodating the inner tank, and a double-shell tank that stands up from the floor surface of the hull and is outside the outside. It is characterized by including a first support member that supports the tank and a second support member that stands up from the inner side surface of the outer tank at a position different from that of the first support member and supports the inner tank.
  • the heat intrusion path from the floor surface to the inner tank is the first support member, the portion between the first support member and the second support member in the outer tank, and the second support member. Therefore, the length of the heat intrusion path can be secured by the distance between the first support member and the second support member along the outer tank. This makes it possible to reduce heat intrusion from the floor surface into the double-shell tank.
  • the outer tank is spherical
  • the second support member is a tubular skirt joined to the inner tank
  • the first support member is a tubular skirt joined to the outer tank. There may be.
  • the second support member may include an upper portion made of the same material as the inner tank, a lower portion made of the same material as the outer tank, and an intermediate portion made of a material having a lower thermal conductivity than the inner tank and the outer tank. According to this configuration, the second support member can be easily joined to the inner tank and the outer tank, and heat conduction through the second support member can be inhibited by the intermediate portion of the second support member.
  • the material of the upper part of the inner tank and the second support member may be the same as the material of the lower part of the outer tank and the second support member.
  • the lengths of the upper portion and the lower portion of the second support member may be shorter than the length of the intermediate portion. According to this configuration, heat intrusion into the double-shell tank can be further reduced as compared with the case where the lengths of the upper part, the middle part and the lower part are the same.
  • the floor surface is the floor surface of the hull
  • the first support member has an upper portion made of the same material as the outer tank, a lower portion made of the same material as the hull, and has a lower thermal conductivity than the outer tank and the hull. It may include an intermediate part of the material. According to this configuration, the first support member can be easily joined to the outer tank and the hull, and the intermediate portion of the first support member can inhibit heat conduction through the first support member.
  • the space between the inner tank and the outer tank may be filled with boil-off gas obtained by vaporizing the liquefied gas.
  • the gas may be liquefied or solidified between the inner tank and the outer tank depending on the temperature of the liquefied gas stored in the inner tank.
  • the gas is a boil-off gas, liquefaction or solidification of the gas between the inner tank and the outer tank can be prevented.
  • the liquefied gas storage structure may be further provided with a heat insulating material that is packed in the space between the inner tank and the outer tank to cover the outer surface of the inner tank and the inner surface of the outer tank.
  • the liquefied gas storage structure may further include a heat insulating material that covers the outer surface of the outer tank. According to this configuration, the distance from the inner tank to the outer tank, in other words, the diameter of the outer tank can be reduced as compared with the case where the outer surface of the outer tank is not covered with the heat insulating material.
  • the liquefied gas storage structure from another aspect of the present invention includes a spherical inner tank for storing the liquefied gas, a double-shell tank including an outer tank for accommodating the inner tank, and an inner side surface of the outer tank.
  • a support member that stands up and supports the inner tank is provided, and the support member has an upper portion made of the same material as the inner tank, a lower portion made of the same material as the outer tank, and heat from the inner tank and the outer tank. It is characterized by including an intermediate portion of a material having a low conductivity.
  • the support member can be easily joined to the inner tank and the outer tank. Moreover, since the intermediate portion of the support member can inhibit heat conduction through the support member, heat intrusion into the double-shell tank can be reduced.
  • the material of the upper part of the inner tank and the support member may be the same as the material of the lower part of the outer tank and the support member.
  • FIG. 1 shows a liquefied gas carrier 1 including a liquefied gas storage structure according to an embodiment of the present invention.
  • the liquefied gas carrier 1 includes a hull 11, a double-shell tank 2 mounted on the hull 11, and a tank cover 12 that forms a holding space 13 around the double-shell tank 2 together with the hull 11.
  • the holding space 13 is filled with nitrogen gas.
  • the holding space 13 may be filled with dry air or may be filled with the exhaust gas of the propulsion engine.
  • the double shell tank 2 includes an inner tank 3 for storing liquefied gas and an outer tank 4 for accommodating the inner tank 3.
  • the liquefied gas is LNG, liquefied nitrogen, liquefied hydrogen, liquefied helium, or the like.
  • the inner tank 3 is spherical.
  • the inner tank 3 does not necessarily have to be spherically symmetric, and may have a shape that approximates spherical symmetry.
  • the inner tank 3 may have a shape that bulges 45 degrees above and / or 45 degrees below the center of the inner tank 3 as compared with spherical symmetry.
  • the inner tank 3 may have a shape in which a short tubular body is sandwiched between the upper hemisphere and the lower hemisphere.
  • the outer tank 4 is also spherical.
  • the center of the outer tank 4 coincides with the center of the inner tank 3.
  • the outer tank 4 does not necessarily have to be spherically symmetric, and may have a shape that approximates spherical symmetry.
  • the outer tank 4 may have a shape that bulges 45 degrees above and / or 45 degrees below the center of the outer tank 4 as compared with spherical symmetry. ..
  • the outer tank 4 may have a shape in which a short tubular body is sandwiched between the upper hemisphere and the lower hemisphere.
  • the material of the outer tank 4 is the same as the material of the inner tank 3. However, the material of the outer tank 4 may be different from the material of the inner tank 3.
  • the first heat insulating material 7 is packed in the space between the inner tank 3 and the outer tank 4.
  • the first heat insulating material 7 completely covers the inner surface of the outer tank 4 and the outer surface of the inner tank 3. Further, the outer surface of the outer tank 4 is completely covered with the second heat insulating material 8.
  • the first heat insulating material 7 may be, for example, a foam made of a resin such as polyurethane (PU) or phenol resin (PF), a granular material such as pearlite or a hollow glass body, or glass wool. It may be an inorganic fiber such as.
  • PU polyurethane
  • PF phenol resin
  • a granular material such as pearlite or a hollow glass body, or glass wool. It may be an inorganic fiber such as.
  • the second heat insulating material 8 is a foam made of a resin such as polyurethane or phenol resin, for example. Since the holding space 13 is filled with nitrogen gas as described above, when the second heat insulating material 8 is a foam, the nitrogen gas enters the second heat insulating material 8 from the holding space 13 and the second heat insulating material 8 is used. The voids in the material 8 are filled with nitrogen gas. Further, nitrogen gas may be supplied to the second heat insulating material 8 from a gas generator (not shown). When the holding space 13 is filled with dry air, the voids in the second heat insulating material 8 may also be filled with dry air.
  • the space between the inner tank 3 and the outer tank 4 is filled with boil-off gas obtained by vaporizing the liquefied gas in the inner tank 3.
  • the space between the inner tank 3 and the outer tank 4 may be filled with other gas that does not liquefy at the temperature of the liquefied gas in the inner tank 3.
  • the space between the inner tank 3 and the outer tank 4 may be a vacuum.
  • a communication hole may be provided in the upper part of the inner tank 3.
  • a branch pipe may be provided in the transfer pipe for guiding the boil-off gas from the inner tank 3 to another device, and the tip of the branch pipe may be opened between the inner tank 3 and the outer tank 4.
  • the first support member 6 is arranged between the floor surface 11a of the hull 11 and the outer tank 4, and the second support member 5 is arranged between the outer tank 4 and the inner tank 3.
  • the first support member 6 rises from the floor surface 11a to support the outer tank 4, and the second support member 5 rises from the inner side surface of the outer tank 4 at a position different from that of the first support member 6 to support the inner tank 3. To do.
  • first support member 6 and the second support member 5 are both tubular skirts whose axial direction is the vertical direction.
  • the upper end of the first support member 6 is joined to the equator portion of the outer tank 4 (the maximum diameter portion located farthest from the vertical center line of the outer tank 4).
  • the upper end of the second support member 5 is joined to the equator portion of the inner tank 3 (the maximum diameter portion located farthest from the vertical center line of the inner tank 3).
  • the first support member 6 includes an upper portion 61, an intermediate portion 62, and a lower portion 63.
  • the lengths of the upper portion 61, the middle portion 62, and the lower portion 63 are the same in the vertical direction, but the lengths thereof can be changed as appropriate.
  • the upper part 61 is made of the same material as the outer tank 4 (for example, aluminum), and the lower part 63 is made of the same material as the hull 11 (for example, carbon steel).
  • the intermediate portion 62 is made of a material (for example, stainless steel) having a lower thermal conductivity than the outer tank 4 and the hull 11.
  • dissimilar joints are provided between the upper portion 61 and the intermediate portion 62 and between the intermediate portion 62 and the lower portion 63.
  • the intermediate portion 62 may be made of the same material as the hull 11, or may be made of the same material as the outer tank 4.
  • the second support member 5 includes an upper portion 51, an intermediate portion 52, and a lower portion 53.
  • the lengths of the upper portion 51 and the lower portion 53 are shorter than the length of the intermediate portion 52 in the vertical direction, but the lengths thereof can be changed as appropriate.
  • the upper portion 51 is made of the same material as the inner tank 3 (for example, aluminum), and the lower portion 53 is made of the same material as the outer tank 4 (for example, aluminum).
  • the intermediate portion 52 is made of a material (for example, stainless steel) having a lower thermal conductivity than the inner tank 3 and the outer tank 4.
  • dissimilar joints are provided between the upper portion 51 and the intermediate portion 52 and between the intermediate portion 52 and the lower portion 53.
  • the second support member 5 may be made of a material having low thermal conductivity (for example, stainless steel) from the upper portion 51 to the lower portion 53 in which the upper portion 51, the intermediate portion 52, and the lower portion 53 are integrated.
  • the heat penetration path from the floor surface 11a to the inner tank 3 is the first support member 6, the first support member 6 and the second support member in the outer tank 4.
  • the portion between 5 becomes the second support member 5. Therefore, the length of the heat intrusion path can be secured by the distance between the first support member 6 and the second support member 5 along the outer tank 4. As a result, heat intrusion from the floor surface 11a into the double shell tank 2 can be reduced.
  • the second support member 5 since the upper portion 51 and the lower portion 53 of the second support member 5 are made of the same material as the inner tank 3 and the outer tank 4, respectively, the second support member 5 is used as the inner tank 3 and the outer tank 4. Can be easily joined to. Moreover, since the intermediate portion 52 of the second support member 5 has a lower thermal conductivity than the upper portion 51 and the lower portion 53, the intermediate portion 52 can inhibit the heat conduction through the second support member 5.
  • the lengths of the upper portion 51 and the lower portion 53 of the second support member 5 are shorter than the length of the intermediate portion 52, so that the lengths of the upper portion 51, the intermediate portion 52, and the lower portion 53 are shorter. Compared with the same case, heat intrusion into the double shell tank 2 can be further reduced.
  • the first support member 6 since the upper 61 and the lower 63 of the first support member 6 are made of the same material as the outer tank 4 and the hull 11, respectively, the first support member 6 can be easily attached to the outer tank 4 and the hull 11. Can be joined to. Moreover, since the intermediate portion 62 of the first support member 6 has a lower thermal conductivity than the upper portion 61 and the lower portion 63, the intermediate portion 62 can inhibit the heat conduction through the first support member 6.
  • the space between the inner tank 3 and the outer tank 4 is filled with boil-off gas.
  • the gas may be liquefied between the inner tank 3 and the outer tank 4 depending on the temperature of the liquefied gas stored in the inner tank 3.
  • the gas is a boil-off gas as in the present embodiment, liquefaction or solidification of the gas between the inner tank 3 and the outer tank 4 can be prevented.
  • the liquefied gas storage structure of the present invention does not necessarily have to be included in the liquefied gas carrier 1, but may be included in the onshore equipment. That is, the floor surface on which the first support member 6 stands may be the ground surface.
  • the space between the inner tank 3 and the outer tank 4 does not necessarily have to be filled with the first heat insulating material 7.
  • the space between the inner tank 3 and the outer tank 4 is a vacuum
  • only the outer surface of the inner tank 3 may be covered with the laminated vacuum heat insulating material in which the radiation shield film and the spacer are alternately laminated. ..
  • the outer surface of the outer tank 4 does not necessarily have to be covered with the second heat insulating material 8, and may be exposed as shown in FIG. However, in this case, it is necessary to increase the distance from the inner tank 3 to the outer tank 4 to ensure the heat insulating performance.
  • the outer surface of the outer tub 4 is covered with the second heat insulating material 8 as in the above embodiment, compared with the case where the outer surface of the outer tub 4 is not covered with the second heat insulating material 8. , The distance from the inner tank 3 to the outer tank 4, in other words, the diameter of the outer tank 4 can be reduced.
  • outer tank 4 does not necessarily have to be spherical, and may have a shape as shown in FIG. 4, for example.
  • first support member 6 and the second support member 5 do not necessarily have to be tubular skirts.
  • each of the first support member 6 and the second support member 5 may be composed of a plurality of columns.
  • the first support member 6 and the second support member 5 are located on the same circumference, and the columns constituting the first support member 6 and the columns constituting the second support member 5 are alternately arranged in the circumferential direction. May be done.

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  • General Engineering & Computer Science (AREA)
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Abstract

液化ガス貯留構造は、液化ガスを貯留する球形の内槽３と、内槽３を収容する外槽４を含む二重殻タンク２を備える。さらに、液化ガス貯留構造は、床面１１ａから立ち上がって外槽４を支持する第１支持部材６と、第１支持部材６と異なる位置で外槽４の内側面から立ち上がって内槽３を支持する第２支持部材５を備える。

Description

液化ガス貯留構造および液化ガス運搬船
　本発明は、液化ガス貯留構造およびこれを含む液化ガス運搬船に関する。
　従来から、ＬＮＧや液化水素などの液化ガスを貯留するタンクが知られている。例えば、特許文献１には、液化水素を貯留する球形のタンクが船体に搭載された液化水素運搬船が開示されている。
　この液化水素運搬船では、船体の床面から立ち上がる筒状のスカートによってタンクが支持されている。また、タンクの外側面は全面的に絶縁層で覆われている。
特表２０１９－５０１０６４号公報
　しかしながら、特許文献１に開示された液化水素運搬船では、床面からスカートを通じたタンク内への熱侵入が大きいという問題がある。
　そこで、本発明は、床面からタンク内への熱侵入を低減することができる液化ガス貯留構造、およびこれを含む液化ガス運搬船を提供することを目的とする。
　前記課題を解決するために、本発明の１つの側面からの液化ガス貯留構造は、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、床面から立ち上がって前記外槽を支持する第１支持部材と、前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、を備える、ことを特徴とする。
　また、本発明の液化ガス運搬船は、船体と、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、前記船体の床面から立ち上がって前記外槽を支持する第１支持部材と、前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、を備える、ことを特徴とする。
　上記の構成によれば、床面から内槽までの熱侵入経路は、第１支持部材、外槽における第１支持部材と第２支持部材の間の部分、第２支持部材となる。従って、外槽に沿った第１支持部材と第２支持部材の離間距離分、熱侵入経路の長さを確保できる。これにより、床面から二重殻タンク内への熱侵入を低減することができる。
　例えば、前記外槽は球形であり、前記第２支持部材は、前記内槽に接合された筒状のスカートであり、前記第１支持部材は、前記外槽に接合された筒状のスカートであってもよい。
　前記第２支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含んでもよい。この構成によれば、第２支持部材を内槽および外槽へ容易に接合することができるとともに、第２支持部材の中間部により第２支持部材を通じた熱伝導を阻害することができる。
　例えば、前記内槽および前記第２支持部材の上部の材質と、前記外槽および前記第２支持部材の下部の材質は同じであってもよい。
　上下方向において、前記第２支持部材の前記上部および前記下部のそれぞれの長さは、前記中間部の長さよりも短くてもよい。この構成によれば、上部、中間部および下部の長さが同じである場合に比べて、二重殻タンク内への熱侵入をより低減することができる。
　前記床面は船体の床面であり、前記第１支持部材は、前記外槽と同じ材質の上部と、前記船体と同じ材質の下部と、前記外槽および前記船体よりも熱伝導率の低い材質の中間部を含んでもよい。この構成によれば、第１支持部材を外槽および船体へ容易に接合することができるとともに、第１支持部材の中間部により第１支持部材を通じた熱伝導を阻害することができる。
　前記内槽と前記外槽の間の空間には前記液化ガスが気化したボイルオフガスが充填されていてもよい。内槽と外槽の間の空間に気体が充填されている場合には、内槽に貯留されている液化ガスの温度によっては内槽と外槽の間で気体が液化または固化する可能性があるが、その気体がボイルオフガスであれば内槽と外槽の間での気体の液化または固化を防ぐことができる。
　例えば、上記の液化ガス貯留構造は、前記内槽と前記外槽の間の空間に詰め込まれて、前記内槽の外側面および前記外槽の内側面を覆う断熱材をさらに備えてもよい。
　上記の液化ガス貯留構造は、前記外槽の外側面を覆う断熱材をさらに備えてもよい。この構成によれば、外槽の外側面が断熱材で覆われていない場合に比べて、内槽から外槽までの距離、換言すれば外槽の直径を小さくすることができる。
　また、本発明の別の側面からの液化ガス貯留構造は、液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、前記外槽の内側面から立ち上がって前記内槽を支持する支持部材と、を備え、前記支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含む、ことを特徴とする。
　上記の構成によれば、支持部材を内槽および外槽へ容易に接合することができる。しかも、支持部材の中間部により支持部材を通じた熱伝導を阻害することができるので、二重殻タンク内への熱侵入を低減することができる。
　例えば、前記内槽および前記支持部材の上部の材質と、前記外槽および前記支持部材の下部の材質は同じであってもよい。
　本発明によれば、床面から二重殻タンク内への熱侵入を低減することができる。
本発明の一実施形態に係る液化ガス貯留構造を含む液化ガス運搬船の断面図である。 図１の一部の拡大図である。 変形例の液化ガス貯留構造を含む液化ガス運搬船の断面図である。 別の変形例の液化ガス貯留構造を含む液化ガス運搬船の断面図である。
　図１に、本発明の一実施形態に係る液化ガス貯留構造を含む液化ガス運搬船１を示す。この液化ガス運搬船１は、船体１１と、船体１１に搭載された二重殻タンク２と、船体１１と共に二重殻タンク２の周囲に保持空間１３を形成するタンクカバー１２を含む。
　本実施形態では、保持空間１３に窒素ガスが充填される。ただし、保持空間１３には、乾燥空気が充填されてもよいし、推進用エンジンの排気ガスが充填されてもよい。
　二重殻タンク２は、液化ガスを貯留する内槽３と、内槽３を収容する外槽４を含む。例えば、液化ガスは、ＬＮＧ、液化窒素、液化水素、液化ヘリウムなどである。
　内槽３は、球形である。内槽３は、必ずしも球対称である必要はなく、球対称に近似する形状であってもよい。例えば、内槽３は、球対称に比べて、内槽３の中心から上４５度の角度方向および／または下４５度の角度方向が膨らんだ形状であってもよい。あるいは、内槽３は、上半球体と下半球体との間に短い筒状体が挟まれた形状であってもよい。
　本実施形態では、外槽４も球形である。外槽４の中心は内槽３の中心と一致している。内槽３と同様に、外槽４も、必ずしも球対称である必要はなく、球対称に近似する形状であってもよい。例えば、外槽４は、内槽３と同様に、球対称に比べて、外槽４の中心から上４５度の角度方向および／または下４５度の角度方向が膨らんだ形状であってもよい。あるいは、外槽４は、上半球体と下半球体との間に短い筒状体が挟まれた形状であってもよい。
　本実施形態では、外槽４の材質が内槽３の材質と同じである。ただし、外槽４の材質は内槽３の材質と異なってもよい。
　内槽３と外槽４の間の空間には第１断熱材７が詰め込まれている。第１断熱材７は、外槽４の内側面および内槽３の外側面を全面的に覆う。さらに、外槽４の外側面は、第２断熱材８により全面的に覆われている。
　第１断熱材７は、例えば、ポリウレタン（ＰＵ）やフェノール樹脂（ＰＦ）などの樹脂からなる発泡体であってもよいし、パーライトやガラス中空体などの粒状体であってもよいし、グラスウールなどの無機繊維であってもよい。
　第２断熱材８は、例えば、ポリウレタンやフェノール樹脂などの樹脂からなる発泡体である。上述したように保持空間１３には窒素ガスが充填されるため、第２断熱材８が発泡体である場合は、保持空間１３から窒素ガスが第２断熱材８内に侵入し、第２断熱材８内の空隙が窒素ガスで充填される。また、ガス発生装置（図示せず）から第２断熱材８に窒素ガスを供給してもよい。なお、保持空間１３に乾燥空気が充填される場合は、第２断熱材８内の空隙にも乾燥空気が充填されてもよい。
　本実施形態では、内槽３と外槽４の間の空間に内槽３内の液化ガスが気化したボイルオフガスが充填されている。ただし、内槽３と外槽４の間の空間には、内槽３内の液化ガスの温度では液化しないその他のガスが充填されてもよい。あるいは、内槽３と外槽４の間の空間は真空であってもよい。
　内槽３と外槽４の間の空間にボイルオフガスを充填する方法としては種々の方法が採用可能である。例えば、内槽３の上部に連通穴を設けてもよい。あるいは、図示は省略するが、内槽３からボイルオフガスを他の機器へ導く移送管に分岐管を設け、この分岐管の先端を内槽３と外槽４の間で開口させてもよい。
　船体１１の床面１１ａと外槽４との間には第１支持部材６が配置されており、外槽４と内槽３との間には第２支持部材５が配置されている。第１支持部材６は、床面１１ａから立ち上がって外槽４を支持し、第２支持部材５は、第１支持部材６と異なる位置で外槽４の内側面から立ち上がって内槽３を支持する。
　本実施形態では、第１支持部材６および第２支持部材５が共に鉛直方向を軸方向とする筒状のスカートである。第１支持部材６の上端は、外槽４の赤道部（外槽４の鉛直中心線から最も遠くに位置する最大径部分）に接合されている。同様に、第２支持部材５の上端は、内槽３の赤道部（内槽３の鉛直中心線から最も遠くに位置する最大径部分）に接合されている。
　図２に示すように、第１支持部材６は、上部６１、中間部６２および下部６３を含む。図例では、上下方向において、上部６１、中間部６２および下部６３の長さが同じになっているが、それらの長さは適宜変更可能である。
　上部６１は、外槽４と同じ材質（例えば、アルミニウム）で構成され、下部６３は、船体１１と同じ材質（例えば、炭素鋼）で構成される。中間部６２は、外槽４および船体１１よりも熱伝導率の低い材質（例えば、ステンレス鋼）で構成される。図示は省略するが、上部６１と中間部６２の間および中間部６２と下部６３の間には異材継手が設けられる。ただし、中間部６２は、船体１１と同じ材質で構成されてもよいし、外槽４と同じ材質で構成されてもよい。
　同様に、第２支持部材５は、上部５１、中間部５２および下部５３を含む。図例では、上下方向において、上部５１および下部５３のそれぞれの長さが中間部５２の長さよりも短くなっているが、それらの長さは適宜変更可能である。
　上部５１は、内槽３と同じ材質（例えば、アルミニウム）で構成され、下部５３は、外槽４と同じ材質（上述した通り、例えば、アルミニウム）で構成される。中間部５２は、内槽３および外槽４よりも熱伝導率の低い材質（例えば、ステンレス鋼）で構成される。図示は省略するが、上部５１と中間部５２の間および中間部５２と下部５３の間には異材継手が設けられる。ただし、第２支持部材５は、上部５１、中間部５２および下部５３が一体化され、上部５１から下部５３まで熱伝導性の低い材質（例えば、ステンレス鋼）で構成されてもよい。
　以上説明したように、本実施形態の液化ガス貯留構造では、床面１１ａから内槽３までの熱侵入経路は、第１支持部材６、外槽４における第１支持部材６と第２支持部材５の間の部分、第２支持部材５となる。従って、外槽４に沿った第１支持部材６と第２支持部材５の離間距離分、熱侵入経路の長さを確保できる。これにより、床面１１ａから二重殻タンク２内への熱侵入を低減することができる。
　また、本実施形態では、第２支持部材５の上部５１および下部５３がそれぞれ内槽３および外槽４と同じ材質で構成されているので、第２支持部材５を内槽３および外槽４へ容易に接合することができる。しかも、第２支持部材５の中間部５２は上部５１および下部５３よりも熱伝導率が低いので、その中間部５２により第２支持部材５を通じた熱伝導を阻害することができる。
　しかも、本実施形態では、第２支持部材５の上部５１および下部５３のそれぞれの長さが中間部５２の長さよりも短くなっているので、上部５１、中間部５２および下部５３の長さが同じである場合に比べて、二重殻タンク２内への熱侵入をより低減することができる。
　さらに、本実施形態では、第１支持部材６の上部６１および下部６３がそれぞれ外槽４および船体１１と同じ材質で構成されているので、第１支持部材６を外槽４および船体１１へ容易に接合することができる。しかも、第１支持部材６の中間部６２は上部６１および下部６３よりも熱伝導率が低いので、その中間部６２により第１支持部材６を通じた熱伝導を阻害することができる。
　また、本実施形態では、内槽３と外槽４の間の空間にボイルオフガスが充填されている。内槽３と外槽４の間の空間に気体が充填されている場合には、内槽３に貯留されている液化ガスの温度によっては内槽３と外槽４の間で気体が液化または固化する可能性があるが、本実施形態のようにその気体がボイルオフガスであれば内槽３と外槽４の間での気体の液化または固化を防ぐことができる。
　（変形例）
　本発明は上述した実施形態に限定されるものではなく、本発明の要旨を逸脱しない範囲で種々の変形が可能である。
　例えば、本発明の液化ガス貯留構造は、必ずしも液化ガス運搬船１に含まれる必要はなく、陸上設備に含まれてもよい。すなわち、第１支持部材６が立ち上がる床面は地上面であってもよい。
　また、内槽３と外槽４の間の空間には、必ずしも第１断熱材７が詰め込まれている必要はない。例えば、内槽３と外槽４の間の空間が真空である場合は、内槽３の外側面のみが、輻射シールドフィルムとスペーサが交互に積層された積層真空断熱材で覆われてもよい。
　さらに、外槽４の外側面は必ずしも第２断熱材８で覆われている必要はなく、図３に示すように露出していてもよい。しかし、この場合には、内槽３から外槽４までの距離を大きくして断熱性能を確保する必要がある。これに対し、前記実施形態のように外槽４の外側面が第２断熱材８で覆われていれば、外槽４の外側面が第２断熱材８で覆われていない場合に比べて、内槽３から外槽４までの距離、換言すれば外槽４の直径を小さくすることができる。
　また、外槽４は、必ずしも球形である必要はなく、例えば、図４に示すような形状であってもよい。
　また、第１支持部材６および第２支持部材５は必ずしも筒状のスカートである必要はない。例えば、第１支持部材６および第２支持部材５のそれぞれは、複数の支柱で構成されてもよい。この場合、第１支持部材６および第２支持部材５が同一円周上に位置し、第１支持部材６を構成する支柱と第２支持部材５を構成する支柱とが周方向に交互に配置されてもよい。
　１　　液化ガス運搬船
　１１　船体
　１１ａ　床面
　２　　二重殻タンク
　３　　内槽
　４　　外槽
　５　　第２支持部材
　５１　上部
　５２　中間部
　５３　下部
　６　　第１支持部材
　６１　上部
　６２　中間部
　６３　下部
　７，８　断熱材

Claims (12)

  1. 　液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、
    　床面から立ち上がって前記外槽を支持する第１支持部材と、
    　前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、
    を備える、液化ガス貯留構造。
  2. 　前記外槽は球形であり、
    　前記第２支持部材は、前記内槽に接合された筒状のスカートであり、
    　前記第１支持部材は、前記外槽に接合された筒状のスカートである、請求項１に記載の液化ガス貯留構造。
  3. 　前記第２支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含む、請求項１または２に記載の液化ガス貯留構造。
  4. 　前記内槽および前記第２支持部材の上部の材質と、前記外槽および前記第２支持部材の下部の材質は同じである、請求項３に記載の液化ガス貯留構造。
  5. 　上下方向において、前記第２支持部材の前記上部および前記下部のそれぞれの長さは、前記中間部の長さよりも短い、請求項３または４に記載の液化ガス貯留構造。
  6. 　前記床面は船体の床面であり、
    　前記第１支持部材は、前記外槽と同じ材質の上部と、前記船体と同じ材質の下部と、前記外槽および前記船体よりも熱伝導率の低い材質の中間部を含む、請求項１～５の何れか一項に記載の液化ガス貯留構造。
  7. 　前記内槽と前記外槽の間の空間には前記液化ガスが気化したボイルオフガスが充填されている、請求項１～６の何れか一項に記載の液化ガス貯留構造。
  8. 　前記内槽と前記外槽の間の空間に詰め込まれて、前記内槽の外側面および前記外槽の内側面を覆う断熱材をさらに備える、請求項１～７の何れか一項に記載の液化ガス貯留構造。
  9. 　前記外槽の外側面を覆う断熱材をさらに備える、請求項１～８の何れか一項に記載の液化ガス貯留構造。
  10. 　船体と、
    　液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、
    　前記船体の床面から立ち上がって前記外槽を支持する第１支持部材と、
    　前記第１支持部材と異なる位置で前記外槽の内側面から立ち上がって前記内槽を支持する第２支持部材と、
    を備える、液化ガス運搬船。
  11. 　液化ガスを貯留する球形の内槽、および前記内槽を収容する外槽を含む二重殻タンクと、
    　前記外槽の内側面から立ち上がって前記内槽を支持する支持部材と、を備え、
    　前記支持部材は、前記内槽と同じ材質の上部と、前記外槽と同じ材質の下部と、前記内槽および前記外槽よりも熱伝導率の低い材質の中間部を含む、液化ガス貯留構造。
  12. 　前記内槽および前記支持部材の上部の材質と、前記外槽および前記支持部材の下部の材質は同じである、請求項１１に記載の液化ガス貯留構造。
     
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