WO2022144971A1 - Multi-shell tank and vessel - Google Patents

Multi-shell tank and vessel Download PDF

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Publication number
WO2022144971A1
WO2022144971A1 PCT/JP2020/049136 JP2020049136W WO2022144971A1 WO 2022144971 A1 WO2022144971 A1 WO 2022144971A1 JP 2020049136 W JP2020049136 W JP 2020049136W WO 2022144971 A1 WO2022144971 A1 WO 2022144971A1
Authority
WO
WIPO (PCT)
Prior art keywords
tank
heat insulating
insulating material
shell
planar heat
Prior art date
Application number
PCT/JP2020/049136
Other languages
French (fr)
Japanese (ja)
Inventor
太一郎 下田
晴彦 冨永
和宏 黒田
森 田中
英和 岩▲崎▼
大輔 神▲崎▼
瑞紀 樫藤
隆道 細野
大地 加野
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 EP20967984.4A priority Critical patent/EP4269225A1/en
Priority to PCT/JP2020/049136 priority patent/WO2022144971A1/en
Priority to JP2022572830A priority patent/JPWO2022144971A1/ja
Priority to CN202080108209.3A priority patent/CN116670023A/en
Priority to KR1020237024741A priority patent/KR20230119006A/en
Publication of WO2022144971A1 publication Critical patent/WO2022144971A1/en

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    • 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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—Details of vessels or of the filling or discharging of vessels for large storage vessels not under pressure
    • 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
    • F17C3/027—Wallpanels for so-called membrane tanks
    • 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
    • F17C2201/0109—Shape cylindrical with exteriorly curved end-piece
    • 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
    • F17C2201/03—Orientation
    • F17C2201/035—Orientation with substantially horizontal main axis
    • 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
    • F17C2203/03—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
    • F17C2203/0337—Granular
    • F17C2203/0341—Perlite
    • 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
    • F17C2203/0358—Thermal insulations by solid means in form of panels
    • 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
    • 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/227—Assembling processes by adhesive 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
    • F17C2209/00—Vessel construction, in particular methods of manufacturing
    • F17C2209/22—Assembling processes
    • F17C2209/228—Assembling processes by screws, bolts or rivets
    • 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
    • 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
    • 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
    • F17C2260/01—Improving mechanical properties or manufacturing
    • F17C2260/013—Reducing manufacturing time or effort
    • 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
    • F17C2260/033—Dealing with losses due to heat transfer by enhancing insulation
    • 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
    • F17C2270/0107—Wall panels
    • 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

Definitions

  • the present invention relates to a multi-shell tank and a ship equipped with a multi-shell tank.
  • the multi-shell tank includes a plurality of tanks including an inner tank for storing low-temperature fluid cargo such as liquefied gas and an outer tank for covering the inner tank. It is known that a vacuum space is formed in the inter-tank region of the multi-shell tank in order to improve the heat insulating property.
  • Patent Document 1 discloses a double-shell tank mounted on a ship.
  • the double-shell tank disclosed in Patent Document 1 includes an inner tank that stores liquefied gas, an outer tank that surrounds the inner tank and a vacuum space is formed between the inner tank, and at least a part of the inner tank. It includes at least one metal sheet attached to the inner tank so as to face the bottom surface, an adsorbent for gas molecules placed on the metal sheet, and a heat insulating sheet covering the inner tank and the metal sheet.
  • the heat insulating sheet includes alternately stacked radiant shield films and a sheet-like spacer having a small thermal conductivity.
  • the present invention has been made in view of the above circumstances, and is a multi-shell tank for storing liquefied gas, which has high heat insulating performance without relying on a high vacuum between the inner tank and the outer tank.
  • the subject is to prepare for.
  • the multi-shell tank according to one aspect of the present invention is An inner tank that stores liquefied gas and A single or multiple outer tanks arranged with a gap on the outside of the inner tank so as to surround the inner tank.
  • the ship according to one aspect of the present invention is With the hull, It is characterized by including the multi-shell tank mounted on the hull.
  • the multi-shell tank and the ship having the above configuration heat conduction and heat convection are inhibited by two or more heat insulating layers made of a planar heat insulating material, so that the multi-shell tank is filled with gas even if the tanks are filled with gas.
  • the tank wall is equipped with sufficiently high insulation performance.
  • FIG. 1 is a side view showing an overall configuration of a ship equipped with a multi-shell tank according to an embodiment of the present invention.
  • FIG. 2 is a cross-sectional view illustrating the structure of a multi-shell tank mounted on a ship.
  • FIG. 3 is a cross-sectional view of the multi-shell tank according to the first example.
  • FIG. 4 is a diagram illustrating a method of fixing the planar heat insulating material.
  • FIG. 5 is a cross-sectional view of the multi-shell tank according to the first example in which the granular heat insulating material is filled between the tanks.
  • FIG. 6 is a cross-sectional view of the multi-shell tank according to the second example.
  • FIG. 7 is a cross-sectional view of the multi-shell tank according to the third example.
  • FIG. 8 is a cross-sectional view of the multi-shell tank according to the fourth example.
  • FIG. 9 is a cross-sectional view of the multi-shell tank according to the fifth example.
  • FIG. 10 is a cross-sectional view of the multi-shell tank according to the sixth example.
  • FIG. 1 shows a ship 1 equipped with a multi-shell tank 3 according to an embodiment of the present invention.
  • the ship 1 includes a hull 2 and two multi-shell tanks 3 mounted on the hull 2.
  • the multi-shell tank 3 is a cargo tank for transporting a low temperature fluid.
  • the multi-shell tanks 3 are arranged in the direction of the captain in the present embodiment, but may be arranged in the direction of the width of the ship if the width of the ship is wide. Further, the number of the multi-shell tanks 3 mounted on the hull 2 may be one or three or more.
  • the two multi-shell tanks 3 have substantially the same structure.
  • the multi-shell tank 3 is configured as a double-shell tank.
  • each multi-shell tank 3 includes an inner tank 4 for storing cargo and an outer tank 5 for wrapping the inner tank 4.
  • the inner tank 4 and the outer tank 5 are separated from each other substantially evenly, and a tank space 30 in the thickness direction of the tank wall is formed between the inner tank 4 and the outer tank 5.
  • the heat insulating structure of the tank wall of the multi-shell tank 3 will be described in detail later.
  • the cargo is liquefied petroleum gas (LPG, about -45 ° C), liquefied ethylene gas (LEG, about -100 ° C), liquefied natural gas (LNG, about -160 ° C), liquefied oxygen (LO 2 , about -180 ° C). , Liquefied hydrogen (LH 2 , about ⁇ 250 ° C.), and liquefied gas of liquefied helium (LHe, about -270 ° C.).
  • LPG liquefied petroleum gas
  • LPG liquefied ethylene gas
  • LNG liquefied natural gas
  • LO 2 liquefied oxygen
  • LHe Liquefied hydrogen
  • LHe liquefied gas of liquefied helium
  • the cargo does not necessarily have to be a liquid, but may be a gas.
  • the inner tank 4 includes a cylindrical inner tank main body 41 that is long in the horizontal direction and an inner tank dome 42 that projects upward from the inner tank main body 41.
  • the axial direction of the inner tank main body 41 is parallel to the captain's direction.
  • the axial direction of the inner tank dome 42 is parallel to the vertical direction in this embodiment, but may be slightly tilted with respect to the vertical direction.
  • the outer tank 5 includes a cylindrical outer tank main body 51 that is long in the horizontal direction, and an outer tank dome 52 that projects upward from the outer tank main body 51.
  • the outer tank main body 51 surrounds the inner tank main body 41.
  • the outer tank dome 52 surrounds the inner tank dome 42.
  • the axial direction of the outer tank main body 51 is parallel to the ship length direction like the inner tank main body 41, and the axial direction of the outer tank dome 52 is parallel to the vertical direction like the inner tank dome 42.
  • the inner tank main body 41 and the outer tank main body 51 do not necessarily have to have a long cylindrical shape in the horizontal direction, and may have a long cylindrical shape in the vertical direction.
  • the inner tank main body 41 and the outer tank main body 51 may have a spherical shape, or may have a cubic shape or a rectangular parallelepiped shape.
  • the hull 2 is formed with two cargo compartments 21 that open upward.
  • the cargo compartments 21 are lined up in the direction of the captain, and the cargo compartments 21 are separated from each other by a partition wall 22. Then, the lower part of the multi-shell tank 3 is inserted inside each cargo hold 21.
  • a pair of saddles 25 separated from each other in the captain's direction are provided inside each cargo hold 21, a pair of saddles 25 separated from each other in the captain's direction.
  • the saddle 25 supports the outer tank main body 51 of the outer tank 5 of the multi-shell tank 3.
  • a pair of support members 35 for supporting the inner tank main body 41 are provided between the inner tank 4 and the outer tank 5 of the multi-shell tank 3.
  • the support member 35 is provided at the same position as the saddle 25, but the support member 35 may be provided at a position different from the saddle 25.
  • a tank cover 6 is arranged above each multi-shell tank 3. Each tank cover 6 covers the corresponding multi-shell tank 3 from above, and forms a holding space 7 between the tank cover 6 and the hull 2 in which the inert gas is filled.
  • the outer tank main body 51 of the outer tank 5 described above is located below the tank cover 6, and the outer tank dome 52 penetrates the tank cover 6.
  • FIG. 3 is a cross-sectional view of the multi-shell tank 3 according to the first example.
  • the multiple shell tank 3 is a single or multiple outer tank arranged with a gap on the outside of the inner tank 4 so as to surround the inner tank 4 for storing the liquefied gas and the inner tank 4.
  • a planar surface that is provided so as to cover two or more of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5, and inhibits heat radiation, heat conduction, and heat convection.
  • a heat insulating material 9 is provided.
  • the planar heat insulating material 9 has a panel shape.
  • the planar heat insulating material 9 has a thickness of 0.01 times or more and 1 times or less the gap between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4.
  • the planar heat insulating material 9 may be a multi-layered panel in which the heat insulating material is sandwiched between plate-shaped base materials.
  • the planar heat insulating material 9 is not limited to the panel shape, but may be a sheet shape. Examples of such a planar heat insulating material 9 include urethane foam panels, airgel sheets, and sheet-shaped glass wool.
  • the surface heat insulating material 9 is fixed to the surface of the inner tank 4 or the outer tank 5 by a fixative.
  • a metal base plate 81 is joined to the inner tank 4 (or the outer tank 5) by welding or the like.
  • a stud bolt 82 is joined to the base plate 81 by a screw structure or welding.
  • the material of the stud bolt 82 is not particularly limited, but it is desirable that the stud bolt 82 has a low thermal conductivity such as glass fiber reinforced plastic (GFRP).
  • GFRP glass fiber reinforced plastic
  • the stud bolt 82 is inserted into a hole provided in the planar heat insulating material 9 and then screwed into a nut 83.
  • the planar heat insulating material 9 may be fixed to the surface of the inner tank 4 or the outer tank 5 by a self-adhesive function of an adhesive or urethane foam.
  • the space between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4 (first tank 30A) is filled with a low-temperature gas (for example, liquefied gas of cargo). Is filled with vaporized gas, etc.).
  • the gas filled in the first tank 30A may be a gas vaporized from the inner tank 4 by communicating the inner tank 4 and the first tank 30A.
  • the pressure of 30A between the first tanks is 1 kPa or more.
  • the pressure of 30A between the first tanks is sufficiently high as compared with the conventional vacuum insulation.
  • the pressure of 30A between the first tanks may be 1 kPa or more and may be a negative pressure with respect to the atmospheric pressure.
  • the degree of vacuum of 30A between the first tanks is sufficiently low as compared with the conventional vacuum insulation.
  • a gap 31 in the thickness direction of the tank wall of the multi-shell tank 3 is provided in the space 30A between the first tanks.
  • the planar heat insulating material 9 does not exist in the gap 31.
  • This gap 31 is used as a work space and has a sufficient size for work.
  • the gap 31 may be used for arranging the piping.
  • the size of the gap 31 in the thickness direction of the tank wall is, for example, 0.1 times or more and 0.99 times or less the gap between the tanks 30.
  • a worker can enter the gap 31 to inspect the planar heat insulating material 9 and maintain the planar heat insulating material 9.
  • a gap 31 for moving the planar heat insulating material 9 and handling the fixture is 31. Is particularly useful.
  • the planar heat insulating material 9 and the void 31 are made large, the outer tank 5 becomes large, which may affect the cost due to the increase in the installation space and the weight of the tank.
  • the thickness of the planar heat insulating material 9, the distance between the tanks 30 and the gap 31 can be flexibly selected according to the required heat insulating performance and the limitation of the installation space.
  • the void 31 of the first tank space 30A may be filled with a granular heat insulating material 95 such as pearlite.
  • a granular heat insulating material 95 such as pearlite.
  • the planar heat insulating material 9 is provided so as to cover either the inner surface of the first outer tank 5A arranged immediately outside the inner tank 4 of the outer tank 5 or the outer surface of the first outer tank 5A.
  • the first planar heat insulating material was provided so as to cover the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5 that were not covered with the first planar heat insulating material. Includes a second planar insulation.
  • the heat insulating performance of the first planar heat insulating material and the second planar heat insulating material may be different from each other depending on the place where the planar heat insulating material 9 is arranged. Multiplexing by appropriately adjusting the type and thickness of the first planar heat insulating material and the second planar heat insulating material according to the first tank 30A and the second tank 30B having different temperature conditions and atmospheric conditions.
  • the shell tank 3 can have sufficiently high heat insulating performance even if the space between the tanks 30 is not a high vacuum.
  • the multi-shell tank 3A shown in FIG. 3 is a double-shell tank and has an inner tank 4 and a single outer tank 5.
  • a planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
  • the multi-shell tank 3B shown in FIG. 6 is a double-shell tank, and has an inner tank 4 and a single outer tank 5.
  • a planar heat insulating material 9 is fixed to the inner surface of the outer tank 5 so as to cover the inner surface of the outer tank 5. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
  • the multi-shell tank 3C shown in FIG. 7 is a double-shell tank and has an inner tank 4 and a single outer tank 5.
  • a planar heat insulating material 9 is fixed to the inner surface of the inner tank 4 so as to cover the outer surface of the inner tank 4.
  • a planar heat insulating material 9 is fixed to the inner surface of the outer tank 5 so as to cover the inner surface of the outer tank 5. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
  • the multi-shell tank 3D shown in FIG. 8 is a triple-shell tank, and has an inner tank 4 and a double outer tank 5.
  • the double outer tank 5 is composed of a first outer tank 5A arranged immediately outside the inner tank 4 and a second outer tank 5B arranged outside the first outer tank 5A.
  • an inert gas having a boiling point higher than that of the gas filled in the first tank 30A for example, nitrogen is used. Is filled.
  • the planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4.
  • the planar heat insulating material 9 is fixed to the outer surface of the first outer tank 5A so as to cover the outer surface of the first outer tank 5A.
  • the planar heat insulating material 9 is fixed to the outer surface of the second outer tank 5B so as to cover the outer surface of the second outer tank 5B.
  • the planar heat insulating material 9 covers the inner surface of the first outer tank 5A to cover the inner surface of the first outer tank 5A. It may be fixed to.
  • the planar heat insulating material 9 covers the inner surface of the second outer tank 5B instead of the planar heat insulating material 9 covering the outer surface of the second outer tank 5B. It may be fixed to the inner surface of.
  • the multi-shell tank 3E shown in FIG. 9 is a triple-shell tank and has an inner tank 4 and a double outer tank 5 (first outer tank 5A and second outer tank 5B).
  • the planar heat insulating material 9 is fixed to the inner surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A. Further, the planar heat insulating material 9 is fixed to the outer surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A.
  • At least one surface of the outer surface of the inner tank 4, the inner surface of the second outer tank 5B, and the outer surface of the second outer tank 5B is surface-insulated. It may be covered with the material 9.
  • the multi-shell tank 3F shown in FIG. 10 is a triple-shell tank, and has an inner tank 4 and a double outer tank 5 (first outer tank 5A and second outer tank 5B).
  • the planar heat insulating material 9 is fixed to the inner surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A.
  • the planar heat insulating material 9 is fixed to the inner surface of the second outer tank 5B so as to cover the inner surface of the second outer tank 5B.
  • the planar heat insulating material 9 covers the outer surface of the first outer tank 5A to cover the outer surface of the first outer tank 5A. It may be fixed to. Further, in the multi-shell tank 3F, the planar heat insulating material 9 covers the outer surface of the second outer tank 5B instead of the planar heat insulating material 9 covering the inner surface of the second outer tank 5B. It may be fixed to the outer surface of the.
  • the planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4 instead of the planar heat insulating material 9 covering the inner surface of the second outer tank 5B. May be done.
  • the multi-shell tank 3 of the present embodiment is a single layer or a single shell tank 3 arranged with a gap on the outside of the inner tank 4 so as to surround the inner tank 4 for storing the liquefied gas and the inner tank 4. It is fixed to the plurality of outer tanks 5 so as to cover two or more of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5, and inhibits heat conduction and heat convection.
  • the surface heat insulating material 9 is provided, and the space between the tanks 30 is filled with gas.
  • the following can be exemplified as the arrangement of the planar heat insulating material 9 when the outer tank 5 is a single layer.
  • the planar heat insulating material 9 is provided so as to cover the outer surface of the inner tank 4 and the inner surface of the outer tank 5.
  • the planar heat insulating material 9 is provided so as to cover two surfaces, the outer surface of the inner tank 4 and the outer surface of the outer tank 5.
  • the planar heat insulating material 9 is provided so as to cover two surfaces, the inner surface of the outer tank 5 and the outer surface of the outer tank 5.
  • the planar heat insulating material 9 is provided so as to cover three surfaces of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5.
  • the ship 1 is characterized by including a hull 2 and a multi-shell tank 3 mounted on the hull 2.
  • the space between the tanks 30 is filled with gas by inhibiting heat conduction and heat convection by the two-layer heat insulating layer made of the planar heat insulating material 9.
  • the tank wall of the multi-shell tank 3 is provided with sufficiently high heat insulating performance.
  • the planar heat insulating material 9 is fixed to the surface of the inner tank 4 or the outer tank 5, even if the inner tank 4 and the outer tank 5 are thermally shrunk, the planar heat insulating material 9 is heat-insulated. It is difficult for the material 9 to be displaced or biased with respect to the surface to which it is attached, and the reliability of the heat insulating performance in each portion of the tank wall can be improved.
  • the pressure between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4 is 30 (30A between the first tanks). It may be 1 kPa or more.
  • the pressure of 30A between the first tanks may be a negative pressure with respect to the atmospheric pressure.
  • the tank wall of the multi-shell tank 3 can be provided with even higher heat insulating performance.
  • the planar heat insulating material 9 may be in the form of a panel.
  • the planar heat insulating material 9 may be fixed to the surface covered by the planar heat insulating material 9 by a fixative (stud bolt 82 and nut 83).
  • planar heat insulating material 9 Since the planar heat insulating material 9 is fixed by the fixture in this way, it is relatively easy to put on and take off, so that on-site construction can be simplified.
  • each of the tank spaces 30 may have a working gap 31 in the thickness direction.
  • the void 31 means a space in the space between the tanks 30 that is not occupied by the planar heat insulating material 9 and through which an object other than gas (for example, a worker or a pipe) can pass.
  • the gap 31 is provided between the tanks 30 in this way, the worker can perform the mounting work, the piping work, etc. of the planar heat insulating material 9 by using the gap 31 at the time of construction, and this gap 31 at the time of maintenance.
  • An inspection device can be introduced into the gap 31 to inspect the planar heat insulating material 9, or a worker can replace the planar heat insulating material 9 by using the gap 31.
  • the planar heat insulating material 9 is either the inner surface of the first outer tank 5A arranged immediately outside the inner tank 4 of the outer tank 5 or the outer surface of the first outer tank 5A. Covers the first surface heat insulating material provided so as to cover the surface, and the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5 that are not covered with the first surface heat insulating material. It is desirable to include the second planar heat insulating material provided as described above.
  • the multi-shell tank 3 is mounted on the ship 1, but the structure of the multi-shell tank 3 may be applied to a tank for storing liquefied gas installed on the ground.

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Abstract

This multi-shell tank comprises: an inner tank that retains liquefied gas; a single or multiple outer tanks that are arranged with a gap outside the inner tank so as to surround the inner tank; and a planar insulating material that is fixed to two or more surfaces among the outer surface of the inner tank, the inner surface of the outer tanks, and the outer surface of the outer tanks so as to cover the surfaces, and inhibits thermal radiation, thermal conduction, and thermal convection. The tank wall has high thermal insulation properties that are achieved without the need for high vacuum between the inner tank and the outer tank.

Description

多重殻タンク及び船舶Multiple shell tanks and ships
　本発明は、多重殻タンク及び多重殻タンクを搭載した船舶に関する。 The present invention relates to a multi-shell tank and a ship equipped with a multi-shell tank.
　従来から、貨物タンクとして多重殻タンクを搭載した船舶が知られている。多重殻タンクは、液化ガスなどの低温流体状の貨物を貯留する内槽と、内槽を覆う外槽とを含む複数の槽を備える。多重殻タンクの槽間領域には、断熱性を高めるために、真空空間が形成されたものが知られている。特許文献１は、船舶に搭載される二重殻タンクを開示する。 Conventionally, ships equipped with multiple shell tanks have been known as cargo tanks. The multi-shell tank includes a plurality of tanks including an inner tank for storing low-temperature fluid cargo such as liquefied gas and an outer tank for covering the inner tank. It is known that a vacuum space is formed in the inter-tank region of the multi-shell tank in order to improve the heat insulating property. Patent Document 1 discloses a double-shell tank mounted on a ship.
　特許文献１に開示された二重殻タンクは、液化ガスを貯留する内槽と、内槽を取り囲み、内槽との間に真空空間が形成される外槽と、少なくとも一部が内槽の底面と対向するように内槽に取り付けられた少なくとも１つの金属シートと、金属シート上に載置された気体分子の吸着材と、内槽および金属シートを覆う断熱シートと、を備える。断熱シートは、交互に積み上げられた輻射シールドフィルムと、熱伝導率の小さなシート状のスペーサとを含む。 The double-shell tank disclosed in Patent Document 1 includes an inner tank that stores liquefied gas, an outer tank that surrounds the inner tank and a vacuum space is formed between the inner tank, and at least a part of the inner tank. It includes at least one metal sheet attached to the inner tank so as to face the bottom surface, an adsorbent for gas molecules placed on the metal sheet, and a heat insulating sheet covering the inner tank and the metal sheet. The heat insulating sheet includes alternately stacked radiant shield films and a sheet-like spacer having a small thermal conductivity.
国際公開ＷＯ２０１９／０７８０４８International release WO2019 / 078048
　上記特許文献１の二重殻タンクでは、内槽と外槽との槽間を高真空とすることにより、放射熱の侵入を防ぎ、自然対流を阻止して高い断熱効果を得ている。しかし、巨大な容積を有する槽間を真空引きするために時間を要し、それが製造やメンテナンスにかかる時間を長引かせる要因の一つとなり得る。また、耐真空性を備えるために槽壁に十分な厚さを要し、それがタンク重量を増加させる要因の一つとなり得る。また、タンクに多数の補強部材を追加する必要があり、構造が複雑であることから製造が高難度を伴う。 In the double-shell tank of Patent Document 1 above, by creating a high vacuum between the inner tank and the outer tank, the invasion of radiant heat is prevented, natural convection is prevented, and a high heat insulating effect is obtained. However, it takes time to evacuate between tanks having a huge volume, which can be one of the factors that prolong the time required for manufacturing and maintenance. In addition, the tank wall needs to have a sufficient thickness to provide vacuum resistance, which can be one of the factors that increase the weight of the tank. In addition, it is necessary to add a large number of reinforcing members to the tank, and the structure is complicated, which makes manufacturing difficult.
　本発明は以上の事情に鑑みてなされたものであり、液化ガスを貯蔵するための多重殻タンクにおいて、内槽と外槽との槽間を高真空にすることに頼らずに、高い断熱性能を備えることを課題とする。 The present invention has been made in view of the above circumstances, and is a multi-shell tank for storing liquefied gas, which has high heat insulating performance without relying on a high vacuum between the inner tank and the outer tank. The subject is to prepare for.
　本発明の一態様に係る多重殻タンクは、
液化ガスを貯留する内槽と、
前記内槽を取り囲むように、前記内槽の外側に間隙を空けて配置された一重又は多重の外槽と、
前記内槽の外面、前記外槽の内面、及び前記外槽の外面のうち２つ以上の面を覆うように当該面に固定されて、熱伝導及び熱対流を阻害する面状断熱材と、を備え、
各槽間に気体が充填されていることを特徴としている。 The multi-shell tank according to one aspect of the present invention is
An inner tank that stores liquefied gas and
A single or multiple outer tanks arranged with a gap on the outside of the inner tank so as to surround the inner tank.
A planar heat insulating material fixed to the outer surface of the inner tank, the inner surface of the outer tank, and the outer surface of the outer tank so as to cover two or more surfaces to inhibit heat conduction and heat convection. Equipped with
It is characterized in that gas is filled between each tank.
　また、本発明の一態様に係る船舶は、
船体と、
前記船体に搭載された前記多重殻タンクとを備えることを特徴としている。 Further, the ship according to one aspect of the present invention is
With the hull,
It is characterized by including the multi-shell tank mounted on the hull.
　上記構成の多重殻タンク及び船舶によれば、面状断熱材からなる二層以上の断熱層によって熱伝導及び熱対流が阻害されることにより、槽間に気体が充填されていても多重殻タンクのタンク壁に十分に高い断熱性能が備えられる。 According to the multi-shell tank and the ship having the above configuration, heat conduction and heat convection are inhibited by two or more heat insulating layers made of a planar heat insulating material, so that the multi-shell tank is filled with gas even if the tanks are filled with gas. The tank wall is equipped with sufficiently high insulation performance.
　本発明によれば、液化ガスを貯蔵するための多重殻タンクにおいて、内槽と外槽との槽間を高真空にすることに頼らずに、高い断熱性能を備えることができる。 According to the present invention, in a multi-shell tank for storing liquefied gas, high heat insulating performance can be provided without relying on a high vacuum between the inner tank and the outer tank.
図１は、本発明の一実施形態に係る多重殻タンクが搭載された船舶の全体的な構成を示す側面図である。FIG. 1 is a side view showing an overall configuration of a ship equipped with a multi-shell tank according to an embodiment of the present invention. 図２は、船舶に搭載された多重殻タンクの構造を説明する断面図である。FIG. 2 is a cross-sectional view illustrating the structure of a multi-shell tank mounted on a ship. 図３は、第１例に係る多重殻タンクの断面図である。FIG. 3 is a cross-sectional view of the multi-shell tank according to the first example. 図４は、面状断熱材の固定方法を説明する図である。FIG. 4 is a diagram illustrating a method of fixing the planar heat insulating material. 図５は、槽間に粒状断熱材が充填された第１例に係る多重殻タンクの断面図である。FIG. 5 is a cross-sectional view of the multi-shell tank according to the first example in which the granular heat insulating material is filled between the tanks. 図６は、第２例に係る多重殻タンクの断面図である。FIG. 6 is a cross-sectional view of the multi-shell tank according to the second example. 図７は、第３例に係る多重殻タンクの断面図である。FIG. 7 is a cross-sectional view of the multi-shell tank according to the third example. 図８は、第４例に係る多重殻タンクの断面図である。FIG. 8 is a cross-sectional view of the multi-shell tank according to the fourth example. 図９は、第５例に係る多重殻タンクの断面図である。FIG. 9 is a cross-sectional view of the multi-shell tank according to the fifth example. 図１０は、第６例に係る多重殻タンクの断面図である。FIG. 10 is a cross-sectional view of the multi-shell tank according to the sixth example.
　図１に、本発明の一実施形態に係る多重殻タンク３が搭載された船舶１を示す。この船舶１は、船体２と、船体２に搭載された２つの多重殻タンク３とを備える。多重殻タンク３は、低温流体輸送用のカーゴタンクである。多重殻タンク３は、本実施形態では船長方向に並んでいるが、船幅が広い場合は船幅方向に並んでもよい。また、船体２に搭載される多重殻タンク３の数は１つであってもよいし、３つ以上であってもよい。 FIG. 1 shows a ship 1 equipped with a multi-shell tank 3 according to an embodiment of the present invention. The ship 1 includes a hull 2 and two multi-shell tanks 3 mounted on the hull 2. The multi-shell tank 3 is a cargo tank for transporting a low temperature fluid. The multi-shell tanks 3 are arranged in the direction of the captain in the present embodiment, but may be arranged in the direction of the width of the ship if the width of the ship is wide. Further, the number of the multi-shell tanks 3 mounted on the hull 2 may be one or three or more.
　２つの多重殻タンク３は、実質的に同じ構造を有する。本実施形態では、多重殻タンク３は二重殻タンクとして構成されている。図２に示すように、各多重殻タンク３は、貨物を貯留する内槽４と、内槽４を包み込む外槽５とを含む。内槽４と外槽５との間は略均等に離間しており、内槽４と外槽５との間にタンク壁の厚さ方向の槽間３０が形成されている。多重殻タンク３のタンク壁の断熱構造については後ほど詳述する。 The two multi-shell tanks 3 have substantially the same structure. In the present embodiment, the multi-shell tank 3 is configured as a double-shell tank. As shown in FIG. 2, each multi-shell tank 3 includes an inner tank 4 for storing cargo and an outer tank 5 for wrapping the inner tank 4. The inner tank 4 and the outer tank 5 are separated from each other substantially evenly, and a tank space 30 in the thickness direction of the tank wall is formed between the inner tank 4 and the outer tank 5. The heat insulating structure of the tank wall of the multi-shell tank 3 will be described in detail later.
　貨物は、液化石油ガス（ＬＰＧ、約－４５℃）、液化エチレンガス（ＬＥＧ、約－１００℃）、液化天然ガス（ＬＮＧ、約－１６０℃）、液化酸素（ＬＯ2、約－１８０℃）、液化水素（ＬＨ2、約－２５０℃）、及び、液化ヘリウム（ＬＨｅ、約－２７０℃）の液化ガスなどであってよい。但し、貨物は必ずしも液体である必要はなく、気体であってもよい。 The cargo is liquefied petroleum gas (LPG, about -45 ° C), liquefied ethylene gas (LEG, about -100 ° C), liquefied natural gas (LNG, about -160 ° C), liquefied oxygen (LO 2 , about -180 ° C). , Liquefied hydrogen (LH 2 , about −250 ° C.), and liquefied gas of liquefied helium (LHe, about -270 ° C.). However, the cargo does not necessarily have to be a liquid, but may be a gas.
　内槽４は、水平方向に長い円筒形状の内槽本体部４１と、内槽本体部４１から上向きに突出する内槽ドーム４２とを含む。本実施形態では、内槽本体部４１の軸方向が船長方向と平行である。内槽ドーム４２の軸方向は、本実施形態では鉛直方向と平行であるが、鉛直方向に対して多少傾いていてもよい。 The inner tank 4 includes a cylindrical inner tank main body 41 that is long in the horizontal direction and an inner tank dome 42 that projects upward from the inner tank main body 41. In the present embodiment, the axial direction of the inner tank main body 41 is parallel to the captain's direction. The axial direction of the inner tank dome 42 is parallel to the vertical direction in this embodiment, but may be slightly tilted with respect to the vertical direction.
　外槽５は、水平方向に長い円筒形状の外槽本体部５１と、外槽本体部５１から上向きに突出する外槽ドーム５２とを含む。外槽本体部５１は、内槽本体部４１を取り囲む。外槽ドーム５２は、内槽ドーム４２を取り囲む。外槽本体部５１の軸方向は、内槽本体部４１と同様に船長方向と平行であり、外槽ドーム５２の軸方向は、内槽ドーム４２と同様に鉛直方向と平行である。但し、内槽本体部４１及び外槽本体部５１は、必ずしも水平方向に長い円筒形状である必要はなく、鉛直方向に長い円筒形状であってもよい。或いは、内槽本体部４１及び外槽本体部５１は、球形状であってもよいし、立方体状や直方体状であってもよい。 The outer tank 5 includes a cylindrical outer tank main body 51 that is long in the horizontal direction, and an outer tank dome 52 that projects upward from the outer tank main body 51. The outer tank main body 51 surrounds the inner tank main body 41. The outer tank dome 52 surrounds the inner tank dome 42. The axial direction of the outer tank main body 51 is parallel to the ship length direction like the inner tank main body 41, and the axial direction of the outer tank dome 52 is parallel to the vertical direction like the inner tank dome 42. However, the inner tank main body 41 and the outer tank main body 51 do not necessarily have to have a long cylindrical shape in the horizontal direction, and may have a long cylindrical shape in the vertical direction. Alternatively, the inner tank main body 41 and the outer tank main body 51 may have a spherical shape, or may have a cubic shape or a rectangular parallelepiped shape.
　船体２には、上向きに開口する２つの貨物艙２１が形成されている。貨物艙２１は船長方向に並んでおり、貨物艙２１同士は隔壁２２によって仕切られている。そして、各貨物艙２１の内部に、多重殻タンク３の下部が挿入されている。 The hull 2 is formed with two cargo compartments 21 that open upward. The cargo compartments 21 are lined up in the direction of the captain, and the cargo compartments 21 are separated from each other by a partition wall 22. Then, the lower part of the multi-shell tank 3 is inserted inside each cargo hold 21.
　各貨物艙２１の内部には、船長方向に互いに離間する一対のサドル２５が設けられている。サドル２５は、多重殻タンク３の外槽５の外槽本体部５１を支持する。また、多重殻タンク３の内槽４と外槽５との間には、内槽本体部４１を支持する一対の支持部材３５が設けられている。本実施形態では、支持部材３５がサドル２５と同じ位置に設けられているが、支持部材３５はサドル２５と違う位置に設けられてもよい。 Inside each cargo hold 21, a pair of saddles 25 separated from each other in the captain's direction are provided. The saddle 25 supports the outer tank main body 51 of the outer tank 5 of the multi-shell tank 3. Further, a pair of support members 35 for supporting the inner tank main body 41 are provided between the inner tank 4 and the outer tank 5 of the multi-shell tank 3. In the present embodiment, the support member 35 is provided at the same position as the saddle 25, but the support member 35 may be provided at a position different from the saddle 25.
　各多重殻タンク３の上方には、タンクカバー６が配置されている。各タンクカバー６は、対応する多重殻タンク３を上方から覆い、船体２との間に不活性ガスが充填される保持空間７を形成する。上述した外槽５の外槽本体部５１はタンクカバー６の下方に位置しており、外槽ドーム５２はタンクカバー６を貫通している。 A tank cover 6 is arranged above each multi-shell tank 3. Each tank cover 6 covers the corresponding multi-shell tank 3 from above, and forms a holding space 7 between the tank cover 6 and the hull 2 in which the inert gas is filled. The outer tank main body 51 of the outer tank 5 described above is located below the tank cover 6, and the outer tank dome 52 penetrates the tank cover 6.
〔多重殻タンク３の断熱構造〕
　ここで、上記構成の多重殻タンク３に備えられた断熱構造について説明する。図３は、第１例に係る多重殻タンク３の断面図である。図３に示すように、多重殻タンク３は、液化ガスを貯留する内槽４と、内槽４を取り囲むように、内槽４の外側に間隙を空けて配置された一重又は多重の外槽５と、内槽４の外面、外槽５の内面、及び外槽５の外面のうち２つ以上の面を覆うように設けられて、熱放射、熱伝導、及び熱対流を阻害する面状断熱材９と、を備える。 [Insulation structure of multiple shell tank 3]
Here, the heat insulating structure provided in the multi-shell tank 3 having the above configuration will be described. FIG. 3 is a cross-sectional view of the multi-shell tank 3 according to the first example. As shown in FIG. 3, the multiple shell tank 3 is a single or multiple outer tank arranged with a gap on the outside of the inner tank 4 so as to surround the inner tank 4 for storing the liquefied gas and the inner tank 4. A planar surface that is provided so as to cover two or more of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5, and inhibits heat radiation, heat conduction, and heat convection. A heat insulating material 9 is provided.
　面状断熱材９は、パネル状を呈する。面状断熱材９は、内槽４とその直ぐ外側に配置された外槽５（第１外槽５Ａ）との間隙の０．０１倍以上１倍以下の厚みを有する。面状断熱材９は、断熱材を板状の基材で挟み込んだ複層のパネルであってもよい。但し、面状断熱材９はパネル状に限定されず、シート状であってもよい。このような面状断熱材９として、発泡ウレタンパネル、エアロゲルシート、シート状グラスウールなどが例示される。 The planar heat insulating material 9 has a panel shape. The planar heat insulating material 9 has a thickness of 0.01 times or more and 1 times or less the gap between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4. The planar heat insulating material 9 may be a multi-layered panel in which the heat insulating material is sandwiched between plate-shaped base materials. However, the planar heat insulating material 9 is not limited to the panel shape, but may be a sheet shape. Examples of such a planar heat insulating material 9 include urethane foam panels, airgel sheets, and sheet-shaped glass wool.
　面状断熱材９は、固定具によって内槽４又は外槽５の表面に固定されている。図４に示すように、内槽４（又は外槽５）には、金属製のベースプレート８１が溶接などにより接合されている。このベースプレート８１に、ねじ構造又は溶接などによりスタッドボルト８２が接合されている。スタッドボルト８２の材質は、特に限定されるものではないが、例えば、ガラス繊維強化プラスチック（ＧＦＲＰ）などの熱伝導率の低いものであることが望ましい。このスタッドボルト８２は、面状断熱材９に設けられた孔に挿通されたうえ、ナット８３に螺入される。この例では、スタッドボルト８２及びナット８３が固定具に該当する。但し、面状断熱材９は、接着剤や発泡ウレタンによる自己接着機能によって内槽４又は外槽５の表面に固定されていてもよい。 The surface heat insulating material 9 is fixed to the surface of the inner tank 4 or the outer tank 5 by a fixative. As shown in FIG. 4, a metal base plate 81 is joined to the inner tank 4 (or the outer tank 5) by welding or the like. A stud bolt 82 is joined to the base plate 81 by a screw structure or welding. The material of the stud bolt 82 is not particularly limited, but it is desirable that the stud bolt 82 has a low thermal conductivity such as glass fiber reinforced plastic (GFRP). The stud bolt 82 is inserted into a hole provided in the planar heat insulating material 9 and then screwed into a nut 83. In this example, the stud bolt 82 and the nut 83 correspond to the fixture. However, the planar heat insulating material 9 may be fixed to the surface of the inner tank 4 or the outer tank 5 by a self-adhesive function of an adhesive or urethane foam.
　内槽４と、内槽４の直ぐ外側に配置された外槽５（第１外槽５Ａ）との槽間３０（第１槽間３０Ａ）には、低温の気体（例えば、貨物の液化ガスが気化した気体など）が充填されている。第１槽間３０Ａに充填されている気体は、内槽４と第１槽間３０Ａとが連通されることにより内槽４から気化した気体が流入したものであってよい。 The space between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4 (first tank 30A) is filled with a low-temperature gas (for example, liquefied gas of cargo). Is filled with vaporized gas, etc.). The gas filled in the first tank 30A may be a gas vaporized from the inner tank 4 by communicating the inner tank 4 and the first tank 30A.
　第１槽間３０Ａの圧力は、１ｋＰａ以上の圧力である。第１槽間３０Ａの圧力は、従来の真空断熱と比較して十分に高い。また、第１槽間３０Ａの圧力は１ｋＰａ以上で大気圧に対して負圧であってもよい。この場合、従来の真空断熱と比較して、第１槽間３０Ａの真空度は十分に低い。 The pressure of 30A between the first tanks is 1 kPa or more. The pressure of 30A between the first tanks is sufficiently high as compared with the conventional vacuum insulation. Further, the pressure of 30A between the first tanks may be 1 kPa or more and may be a negative pressure with respect to the atmospheric pressure. In this case, the degree of vacuum of 30A between the first tanks is sufficiently low as compared with the conventional vacuum insulation.
　第１槽間３０Ａには、多重殻タンク３のタンク壁の厚さ方向の空隙３１が設けられている。空隙３１には面状断熱材９が存在しない。この空隙３１は、作業用の空間として利用され、作業のために十分な大きさを有する。なお、この空隙３１は配管の配置に利用されてもよい。このような空隙３１のタンク壁の厚さ方向の大きさは、例えば、槽間３０の間隙の０．１倍以上０．９９倍以下である。空隙３１を大きくとる場合、施工時に、作業員がこの空隙３１の中に入って、内槽４及び外槽５に面状断熱材９を固定する作業を行うことができる。また、メンテナンス時に、作業員がこの空隙３１の中に入って面状断熱材９を検査したり、面状断熱材９をメンテナンスしたりすることができる。本実施形態において面状断熱材９の各々は固定具で内槽４又は外槽５の表面に固定されることから、面状断熱材９を移動させたり固定具を取り扱ったりするための空隙３１が設けられることは特に有用である。一方で、面状断熱材９および空隙３１を大きくとると外槽５が大きくなり設置スペースやタンク重量増加によるコストへの影響がある場合が考えられる。多重殻タンク３では、要求される防熱性能や設置スペースの制限に応じて、面状断熱材９の厚み、槽間３０や空隙３１の距離を柔軟に選択することができる。 A gap 31 in the thickness direction of the tank wall of the multi-shell tank 3 is provided in the space 30A between the first tanks. The planar heat insulating material 9 does not exist in the gap 31. This gap 31 is used as a work space and has a sufficient size for work. The gap 31 may be used for arranging the piping. The size of the gap 31 in the thickness direction of the tank wall is, for example, 0.1 times or more and 0.99 times or less the gap between the tanks 30. When the gap 31 is made large, a worker can enter the gap 31 and fix the planar heat insulating material 9 to the inner tank 4 and the outer tank 5 at the time of construction. Further, at the time of maintenance, a worker can enter the gap 31 to inspect the planar heat insulating material 9 and maintain the planar heat insulating material 9. In the present embodiment, since each of the planar heat insulating materials 9 is fixed to the surface of the inner tank 4 or the outer tank 5 with a fixture, a gap 31 for moving the planar heat insulating material 9 and handling the fixture is 31. Is particularly useful. On the other hand, if the planar heat insulating material 9 and the void 31 are made large, the outer tank 5 becomes large, which may affect the cost due to the increase in the installation space and the weight of the tank. In the multi-shell tank 3, the thickness of the planar heat insulating material 9, the distance between the tanks 30 and the gap 31 can be flexibly selected according to the required heat insulating performance and the limitation of the installation space.
　第１槽間３０Ａの空隙３１には、図５に示すように、例えばパーライトなどの粒状断熱材９５が充填されてもよい。これにより、多重殻タンク３の断熱性能を更に向上させることができる。 As shown in FIG. 5, the void 31 of the first tank space 30A may be filled with a granular heat insulating material 95 such as pearlite. Thereby, the heat insulating performance of the multi-shell tank 3 can be further improved.
　以下、多重殻タンク３における面状断熱材９の配置の例を説明する。望ましくは、面状断熱材９は、外槽５のうち内槽４の直ぐ外側に配置された第１外槽５Ａの内面、及び第１外槽５Ａの外面のうちいずれかを覆うように設けられた第１の面状断熱材と、内槽４の外面、外槽５の内面、及び外槽５の外面のうち第１面状断熱材で覆われていない面を覆うように設けられた第２の面状断熱材とを、含む。 Hereinafter, an example of arrangement of the planar heat insulating material 9 in the multi-shell tank 3 will be described. Desirably, the planar heat insulating material 9 is provided so as to cover either the inner surface of the first outer tank 5A arranged immediately outside the inner tank 4 of the outer tank 5 or the outer surface of the first outer tank 5A. The first planar heat insulating material was provided so as to cover the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5 that were not covered with the first planar heat insulating material. Includes a second planar insulation.
　第１の面状断熱材と第２の面状断熱材の防熱性能は、その面状断熱材９が配置される場所に応じて互いに異なっていてもよい。温度条件や雰囲気条件が異なる第１槽間３０Ａと第２槽間３０Ｂとに応じて、第１の面状断熱材と第２の面状断熱材の種類や厚みを適宜調整することで、多重殻タンク３は槽間３０が高真空でなくても十分に高い断熱性能を備えることができる。 The heat insulating performance of the first planar heat insulating material and the second planar heat insulating material may be different from each other depending on the place where the planar heat insulating material 9 is arranged. Multiplexing by appropriately adjusting the type and thickness of the first planar heat insulating material and the second planar heat insulating material according to the first tank 30A and the second tank 30B having different temperature conditions and atmospheric conditions. The shell tank 3 can have sufficiently high heat insulating performance even if the space between the tanks 30 is not a high vacuum.
＜第１例＞
　図３に示す多重殻タンク３Ａは二重殻タンクであって、内槽４と一重の外槽５とを有する。内槽４の外面を覆うように面状断熱材９が内槽４の外面に固定されている。また、外槽５の外面を覆うように、面状断熱材９が外槽５の外面に固定されている。 <First example>
The multi-shell tank 3A shown in FIG. 3 is a double-shell tank and has an inner tank 4 and a single outer tank 5. A planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
＜第２例＞
　図６に示す多重殻タンク３Ｂは二重殻タンクであって、内槽４と一重の外槽５とを有する。外槽５の内面を覆うように面状断熱材９が外槽５の内面に固定されている。また、外槽５の外面を覆うように、面状断熱材９が外槽５の外面に固定されている。 <Second example>
The multi-shell tank 3B shown in FIG. 6 is a double-shell tank, and has an inner tank 4 and a single outer tank 5. A planar heat insulating material 9 is fixed to the inner surface of the outer tank 5 so as to cover the inner surface of the outer tank 5. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
＜第３例＞
　図７に示す多重殻タンク３Ｃは二重殻タンクであって、内槽４と一重の外槽５とを有する。内槽４の外面を覆うように、面状断熱材９が内槽４の内面に固定されている。外槽５の内面を覆うように面状断熱材９が外槽５の内面に固定されている。更に、外槽５の外面を覆うように、面状断熱材９が外槽５の外面に固定されている。 <Third example>
The multi-shell tank 3C shown in FIG. 7 is a double-shell tank and has an inner tank 4 and a single outer tank 5. A planar heat insulating material 9 is fixed to the inner surface of the inner tank 4 so as to cover the outer surface of the inner tank 4. A planar heat insulating material 9 is fixed to the inner surface of the outer tank 5 so as to cover the inner surface of the outer tank 5. Further, the planar heat insulating material 9 is fixed to the outer surface of the outer tank 5 so as to cover the outer surface of the outer tank 5.
＜第４例＞
　図８に示す多重殻タンク３Ｄは三重殻タンクであって、内槽４と二重の外槽５とを有する。二重の外槽５は、内槽４の直ぐ外側に配置された第１外槽５Ａと、第１外槽５Ａの外側に配置された第２外槽５Ｂで構成されている。第１外槽５Ａと第２外槽５Ｂとの槽間３０（第２槽間３０Ｂ）には、第１槽間３０Ａに充填された気体よりも沸点の高い不活性ガス（例えば、窒素など）が充填されている。 <4th example>
The multi-shell tank 3D shown in FIG. 8 is a triple-shell tank, and has an inner tank 4 and a double outer tank 5. The double outer tank 5 is composed of a first outer tank 5A arranged immediately outside the inner tank 4 and a second outer tank 5B arranged outside the first outer tank 5A. In the space 30 between the first outer tank 5A and the second outer tank 5B (between the second tanks 30B), an inert gas having a boiling point higher than that of the gas filled in the first tank 30A (for example, nitrogen) is used. Is filled.
　多重殻タンク３Ｄでは、内槽４の外面を覆うように、面状断熱材９が内槽４の外面に固定されている。第１外槽５Ａの外面を覆うように、面状断熱材９が第１外槽５Ａの外面に固定されている。更に、第２外槽５Ｂの外面を覆うように、面状断熱材９が第２外槽５Ｂの外面に固定されている。多重殻タンク３Ｄにおいて、第１外槽５Ａの外面を覆っている面状断熱材９に代えて、第１外槽５Ａの内面を覆うように面状断熱材９が第１外槽５Ａの内面に固定されてもよい。また、多重殻タンク３Ｄにおいて、第２外槽５Ｂの外面を覆っている面状断熱材９に代えて、第２外槽５Ｂの内面を覆うように面状断熱材９が第２外槽５Ｂの内面に固定されてもよい。 In the multi-shell tank 3D, the planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4. The planar heat insulating material 9 is fixed to the outer surface of the first outer tank 5A so as to cover the outer surface of the first outer tank 5A. Further, the planar heat insulating material 9 is fixed to the outer surface of the second outer tank 5B so as to cover the outer surface of the second outer tank 5B. In the multi-shell tank 3D, instead of the planar heat insulating material 9 covering the outer surface of the first outer tank 5A, the planar heat insulating material 9 covers the inner surface of the first outer tank 5A to cover the inner surface of the first outer tank 5A. It may be fixed to. Further, in the multi-shell tank 3D, the planar heat insulating material 9 covers the inner surface of the second outer tank 5B instead of the planar heat insulating material 9 covering the outer surface of the second outer tank 5B. It may be fixed to the inner surface of.
＜第５例＞
　図９に示す多重殻タンク３Ｅは三重殻タンクであって、内槽４と二重の外槽５（第１外槽５Ａ及び第２外槽５Ｂ）とを有する。この多重殻タンク３Ｅでは、第１外槽５Ａの内面を覆うように、面状断熱材９が第１外槽５Ａの内面に固定されている。更に、第１外槽５Ａの内面を覆うように、面状断熱材９が第１外槽５Ａの外面に固定されている。多重殻タンク３Ｅにおいて、第１外槽５Ａの内面及び外面に加えて、内槽４の外面、第２外槽５Ｂの内面、第２外槽５Ｂの外面のうち少なくとも１つの面が面状断熱材９で覆われていてもよい。 <Fifth example>
The multi-shell tank 3E shown in FIG. 9 is a triple-shell tank and has an inner tank 4 and a double outer tank 5 (first outer tank 5A and second outer tank 5B). In this multi-shell tank 3E, the planar heat insulating material 9 is fixed to the inner surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A. Further, the planar heat insulating material 9 is fixed to the outer surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A. In the multi-shell tank 3E, in addition to the inner surface and the outer surface of the first outer tank 5A, at least one surface of the outer surface of the inner tank 4, the inner surface of the second outer tank 5B, and the outer surface of the second outer tank 5B is surface-insulated. It may be covered with the material 9.
＜第６例＞
　図１０に示す多重殻タンク３Ｆは三重殻タンクであって、内槽４と二重の外槽５（第１外槽５Ａ及び第２外槽５Ｂ）とを有する。この多重殻タンク３Ｆでは、第１外槽５Ａの内面を覆うように、面状断熱材９が第１外槽５Ａの内面に固定されている。更に、第２外槽５Ｂの内面を覆うように、面状断熱材９が第２外槽５Ｂの内面に固定されている。多重殻タンク３Ｆにおいて、第１外槽５Ａの内面を覆っている面状断熱材９に代えて、第１外槽５Ａの外面を覆うように面状断熱材９が第１外槽５Ａの外面に固定されてもよい。また、多重殻タンク３Ｆにおいて、第２外槽５Ｂの内面を覆っている面状断熱材９に代えて、第２外槽５Ｂの外面を覆うように面状断熱材９が第２外槽５Ｂの外面に固定されてもよい。また、多重殻タンク３Ｆにおいて、第２外槽５Ｂの内面を覆っている面状断熱材９に代えて、内槽４の外面を覆うように面状断熱材９が内槽４の外面に固定されてもよい。 <6th example>
The multi-shell tank 3F shown in FIG. 10 is a triple-shell tank, and has an inner tank 4 and a double outer tank 5 (first outer tank 5A and second outer tank 5B). In this multi-shell tank 3F, the planar heat insulating material 9 is fixed to the inner surface of the first outer tank 5A so as to cover the inner surface of the first outer tank 5A. Further, the planar heat insulating material 9 is fixed to the inner surface of the second outer tank 5B so as to cover the inner surface of the second outer tank 5B. In the multi-shell tank 3F, instead of the planar heat insulating material 9 covering the inner surface of the first outer tank 5A, the planar heat insulating material 9 covers the outer surface of the first outer tank 5A to cover the outer surface of the first outer tank 5A. It may be fixed to. Further, in the multi-shell tank 3F, the planar heat insulating material 9 covers the outer surface of the second outer tank 5B instead of the planar heat insulating material 9 covering the inner surface of the second outer tank 5B. It may be fixed to the outer surface of the. Further, in the multi-shell tank 3F, the planar heat insulating material 9 is fixed to the outer surface of the inner tank 4 so as to cover the outer surface of the inner tank 4 instead of the planar heat insulating material 9 covering the inner surface of the second outer tank 5B. May be done.
〔総括〕
　以上に説明したように、本実施形態の多重殻タンク３は、液化ガスを貯留する内槽４と、内槽４を取り囲むように、内槽４の外側に間隙を空けて配置された一重又は多重の外槽５と、内槽４の外面、外槽５の内面、及び外槽５の外面のうち２つ以上の面を覆うように当該面に固定されて、熱伝導及び熱対流を阻害する面状断熱材９と、を備え、各槽間３０に気体が充填されていることを特徴としている。 [Summary]
As described above, the multi-shell tank 3 of the present embodiment is a single layer or a single shell tank 3 arranged with a gap on the outside of the inner tank 4 so as to surround the inner tank 4 for storing the liquefied gas and the inner tank 4. It is fixed to the plurality of outer tanks 5 so as to cover two or more of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5, and inhibits heat conduction and heat convection. The surface heat insulating material 9 is provided, and the space between the tanks 30 is filled with gas.
　外槽５が一重である場合の面状断熱材９の配置として、以下が例示され得る。
（第１例）面状断熱材９が、内槽４の外面と外槽５の内面とを覆うように設けられている。
（第２例）面状断熱材９が、内槽４の外面及び外槽５の外面の２面を覆うように設けられている。
（第３例）面状断熱材９が、外槽５の内面及び外槽５の外面の２面を覆うように設けられている。
（第４例）面状断熱材９が、内槽４の外面、外槽５の内面、及び外槽５の外面の３面を覆うように設けられている。 The following can be exemplified as the arrangement of the planar heat insulating material 9 when the outer tank 5 is a single layer.
(1st Example) The planar heat insulating material 9 is provided so as to cover the outer surface of the inner tank 4 and the inner surface of the outer tank 5.
(2nd example) The planar heat insulating material 9 is provided so as to cover two surfaces, the outer surface of the inner tank 4 and the outer surface of the outer tank 5.
(Third example) The planar heat insulating material 9 is provided so as to cover two surfaces, the inner surface of the outer tank 5 and the outer surface of the outer tank 5.
(Fourth Example) The planar heat insulating material 9 is provided so as to cover three surfaces of the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5.
　また、本実施形態に係る船舶１は、船体２と、船体２に搭載された多重殻タンク３とを備えることを特徴としている。 Further, the ship 1 according to the present embodiment is characterized by including a hull 2 and a multi-shell tank 3 mounted on the hull 2.
　上記構成の多重殻タンク３及び船舶１によれば、面状断熱材９からなる二層の断熱層によって熱伝導、及び熱対流が阻害されることにより、槽間３０に気体が充填されていても多重殻タンク３のタンク壁に十分に高い断熱性能が備えられる。更に、上記構成の多重殻タンク３では、面状断熱材９は内槽４又は外槽５の表面に固定されていることから、内槽４と外槽５が熱収縮しても面状断熱材９のそれが取り付けられた表面に対する位置ズレや偏りが生じにくく、タンク壁の各部分における断熱性能の信頼性を向上させることができる。 According to the multi-shell tank 3 and the ship 1 having the above configuration, the space between the tanks 30 is filled with gas by inhibiting heat conduction and heat convection by the two-layer heat insulating layer made of the planar heat insulating material 9. The tank wall of the multi-shell tank 3 is provided with sufficiently high heat insulating performance. Further, in the multi-shell tank 3 having the above configuration, since the planar heat insulating material 9 is fixed to the surface of the inner tank 4 or the outer tank 5, even if the inner tank 4 and the outer tank 5 are thermally shrunk, the planar heat insulating material 9 is heat-insulated. It is difficult for the material 9 to be displaced or biased with respect to the surface to which it is attached, and the reliability of the heat insulating performance in each portion of the tank wall can be improved.
　上記構成の多重殻タンク３において、内槽４と当該内槽４の直ぐ外側に配置された外槽５（第１外槽５Ａ）との槽間３０（第１槽間３０Ａ）の圧力が、１ｋＰａ以上であってよい。 In the multi-shell tank 3 having the above configuration, the pressure between the inner tank 4 and the outer tank 5 (first outer tank 5A) arranged immediately outside the inner tank 4 is 30 (30A between the first tanks). It may be 1 kPa or more.
　更に、第１槽間３０Ａの圧力が大気圧に対し負圧であってもよい。これにより、多重殻タンク３のタンク壁は更に高い断熱性能を備えることができる。 Further, the pressure of 30A between the first tanks may be a negative pressure with respect to the atmospheric pressure. As a result, the tank wall of the multi-shell tank 3 can be provided with even higher heat insulating performance.
　上記構成の多重殻タンク３において、面状断熱材９は、パネル状であってよい。 In the multi-shell tank 3 having the above configuration, the planar heat insulating material 9 may be in the form of a panel.
　上記構成の多重殻タンク３において、面状断熱材９は、当該面状断熱材９によって覆われる面に固定具（スタッドボルト８２及びナット８３）によって固定されていてよい。 In the multi-shell tank 3 having the above configuration, the planar heat insulating material 9 may be fixed to the surface covered by the planar heat insulating material 9 by a fixative (stud bolt 82 and nut 83).
　このように面状断熱材９が固定具によって固定されていることによって着脱が比較的容易であるので、現場施工を単純化することができる。 Since the planar heat insulating material 9 is fixed by the fixture in this way, it is relatively easy to put on and take off, so that on-site construction can be simplified.
　上記構成の多重殻タンク３において、槽間３０の各々は厚さ方向の作業用の空隙３１を有していてよい。ここで空隙３１は、槽間３０のうち面状断熱材９によって占有されておらず、気体以外の物体（例えば、作業員や配管など）が通過できる空間を意味する。 In the multi-shell tank 3 having the above configuration, each of the tank spaces 30 may have a working gap 31 in the thickness direction. Here, the void 31 means a space in the space between the tanks 30 that is not occupied by the planar heat insulating material 9 and through which an object other than gas (for example, a worker or a pipe) can pass.
　このように槽間３０に空隙３１が設けられていることにより、施工時にはこの空隙３１を利用して作業員が面状断熱材９の取付作業や配管作業等を行うことができ、メンテナンス時にはこの空隙３１に検査機器を導入して面状断熱材９の検査を行ったり空隙３１を利用して作業員が面状断熱材９の取り換え作業などを行ったりすることができる。 Since the gap 31 is provided between the tanks 30 in this way, the worker can perform the mounting work, the piping work, etc. of the planar heat insulating material 9 by using the gap 31 at the time of construction, and this gap 31 at the time of maintenance. An inspection device can be introduced into the gap 31 to inspect the planar heat insulating material 9, or a worker can replace the planar heat insulating material 9 by using the gap 31.
　上記構成の多重殻タンク３において、面状断熱材９が、外槽５のうち内槽４の直ぐ外側に配置された第１外槽５Ａの内面、及び第１外槽５Ａの外面のうちいずれかを覆うように設けられた第１面状断熱材 と、内槽４の外面、外槽５の内面、及び外槽５の外面のうち第１面状断熱材で覆われていない面を覆うように設けられた第２面状断熱材とを、含むことが望ましい。 In the multi-shell tank 3 having the above configuration, the planar heat insulating material 9 is either the inner surface of the first outer tank 5A arranged immediately outside the inner tank 4 of the outer tank 5 or the outer surface of the first outer tank 5A. Covers the first surface heat insulating material provided so as to cover the surface, and the outer surface of the inner tank 4, the inner surface of the outer tank 5, and the outer surface of the outer tank 5 that are not covered with the first surface heat insulating material. It is desirable to include the second planar heat insulating material provided as described above.
　これにより、第１外槽５Ａの内外で特に重点的に断熱が行われる。 As a result, heat insulation is performed with particular emphasis inside and outside the first outer tank 5A.
　以上に本発明の好適な実施の形態を説明したが、本発明の趣旨を逸脱しない範囲で、上記実施形態の具体的な構造及び／又は機能の詳細を変更したものも本発明に含まれ得る。上記の構成は、例えば、以下のように変更することができる。 Although the preferred embodiment of the present invention has been described above, the present invention may include modified details of the specific structure and / or function of the above embodiment without departing from the spirit of the present invention. .. The above configuration can be changed, for example, as follows.
　例えば、上記実施形態において多重殻タンク３は船舶１に搭載されているが、多重殻タンク３の構造は地上に設置される液化ガス貯蔵用のタンクに適用されてもよい。 For example, in the above embodiment, the multi-shell tank 3 is mounted on the ship 1, but the structure of the multi-shell tank 3 may be applied to a tank for storing liquefied gas installed on the ground.
１　　　：船舶
２　　　：船体
３，３Ａ～３Ｆ：多重殻タンク
４　　　：内槽
５　　　：外槽
５Ａ　　：第１外槽
９　　　：面状断熱材
３０　　：槽間
３１　　：空隙 1: Ship 2: Hull 3, 3A to 3F: Multiple shell tank 4: Inner tank 5: Outer tank 5A: First outer tank 9: Plane heat insulating material 30: Between tanks 31: Void

Claims (11)

  1. 　液化ガスを貯留する内槽と、
    　前記内槽を取り囲むように、前記内槽の外側に間隙を空けて配置された一重又は多重の外槽と、
    　前記内槽の外面、前記外槽の内面、及び前記外槽の外面のうち２つ以上の面を覆うように当該面に固定されて、熱伝導及び熱対流を阻害する面状断熱材と、を備え、
    　各槽間に気体が充填されている、
    多重殻タンク。     An inner tank that stores liquefied gas and
    A single or multiple outer tanks arranged with a gap on the outside of the inner tank so as to surround the inner tank.
    A planar heat insulating material fixed to the outer surface of the inner tank, the inner surface of the outer tank, and the outer surface of the outer tank so as to cover two or more surfaces to inhibit heat conduction and heat convection. Equipped with
    Each tank is filled with gas,
    Multiple shell tank.
  2. 　前記内槽と当該内槽の直ぐ外側に配置された前記外槽との槽間の圧力が、１ｋＰａ以上である、
    請求項１に記載の多重殻タンク。     The pressure between the inner tank and the outer tank arranged immediately outside the inner tank is 1 kPa or more.
    The multi-shell tank according to claim 1.
  3. 　前記面状断熱材は、パネル状である、
    請求項１又は２に記載の多重殻タンク。     The planar heat insulating material has a panel shape.
    The multi-shell tank according to claim 1 or 2.
  4. 　前記面状断熱材は、当該面状断熱材によって覆われる面に固定具によって固定されている、
    請求項１～３のいずれか一項に記載の多重殻タンク。     The planar heat insulating material is fixed to the surface covered with the planar heat insulating material by a fixative.
    The multi-shell tank according to any one of claims 1 to 3.
  5. 　前記槽間の各々はタンク壁の厚さ方向の作業用の空隙を有する、
    請求項１～４のいずれか一項に記載の多重殻タンク。     Each of the tanks has a working gap in the thickness direction of the tank wall.
    The multi-shell tank according to any one of claims 1 to 4.
  6. 　前記面状断熱材が、
    　前記外槽のうち前記内槽の直ぐ外側に配置された第１外槽の内面、及び前記第１外槽の外面のうちいずれかを覆うように設けられた第１面状断熱材と、
    　前記内槽の外面、前記外槽の内面、及び前記外槽の外面のうち第１面状断熱材で覆われていない面を覆うように設けられた第２面状断熱材とを、含む、
    請求項１～５のいずれか一項に記載の多重殻タンク。     The planar heat insulating material is
    A first surface heat insulating material provided so as to cover either the inner surface of the first outer tank arranged immediately outside the inner tank of the outer tank or the outer surface of the first outer tank.
    The outer surface of the inner tank, the inner surface of the outer tank, and the second surface heat insulating material provided so as to cover the outer surface of the outer tank not covered with the first surface heat insulating material are included.
    The multi-shell tank according to any one of claims 1 to 5.
  7. 　前記外槽は一重であって、
    　前記面状断熱材が、前記内槽の外面と前記外槽の内面とを覆うように設けられている、
    請求項１～５のいずれか一項に記載の多重殻タンク。     The outer tank is single
    The planar heat insulating material is provided so as to cover the outer surface of the inner tank and the inner surface of the outer tank.
    The multi-shell tank according to any one of claims 1 to 5.
  8. 　前記外槽は一重であって、
    　前記面状断熱材が、前記内槽の外面及び前記外槽の外面の２面を覆うように設けられている、
    請求項１～５のいずれか一項に記載の多重殻タンク。     The outer tank is single
    The planar heat insulating material is provided so as to cover two surfaces, the outer surface of the inner tank and the outer surface of the outer tank.
    The multi-shell tank according to any one of claims 1 to 5.
  9. 　前記外槽は一重であって、
    　前記面状断熱材が、前記外槽の内面及び前記外槽の外面の２面を覆うように設けられている、
    請求項１～５のいずれか一項に記載の多重殻タンク。     The outer tank is single
    The planar heat insulating material is provided so as to cover two surfaces, the inner surface of the outer tank and the outer surface of the outer tank.
    The multi-shell tank according to any one of claims 1 to 5.
  10. 　前記外槽は一重であって、
    　前記面状断熱材が、前記内槽の外面、前記外槽の内面、及び前記外槽の外面の３面を覆うように設けられている、
    請求項１～５のいずれか一項に記載の多重殻タンク。     The outer tank is single
    The planar heat insulating material is provided so as to cover three surfaces of the outer surface of the inner tank, the inner surface of the outer tank, and the outer surface of the outer tank.
    The multi-shell tank according to any one of claims 1 to 5.
  11. 　船体と、
    　前記船体に搭載された請求項１～１０のいずれか一項に記載の多重殻タンクとを備える、
    船舶。     With the hull,
    The multi-shell tank according to any one of claims 1 to 10 mounted on the hull is provided.
    Ship.
PCT/JP2020/049136 2020-12-28 2020-12-28 Multi-shell tank and vessel WO2022144971A1 (en)

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JP2022572830A JPWO2022144971A1 (en) 2020-12-28 2020-12-28
CN202080108209.3A CN116670023A (en) 2020-12-28 2020-12-28 Multi-layer shell tank and ship
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Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141595A (en) * 1996-11-05 1998-05-29 Ishikawajima Harima Heavy Ind Co Ltd Low temperature liquefied gas storage tank
JP2016016806A (en) * 2014-07-10 2016-02-01 三菱重工業株式会社 Carrier ship
JP2017194166A (en) * 2013-06-21 2017-10-26 川崎重工業株式会社 Liquefied gas retention tank and liquefied gas carrying vessel
WO2019078048A1 (en) 2017-10-16 2019-04-25 川崎重工業株式会社 Double shell tank, and ship

Patent Citations (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPH10141595A (en) * 1996-11-05 1998-05-29 Ishikawajima Harima Heavy Ind Co Ltd Low temperature liquefied gas storage tank
JP2017194166A (en) * 2013-06-21 2017-10-26 川崎重工業株式会社 Liquefied gas retention tank and liquefied gas carrying vessel
JP2016016806A (en) * 2014-07-10 2016-02-01 三菱重工業株式会社 Carrier ship
WO2019078048A1 (en) 2017-10-16 2019-04-25 川崎重工業株式会社 Double shell tank, and ship

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