WO2014203530A1 - 液化ガス保持タンクおよび液化ガス運搬船 - Google Patents
液化ガス保持タンクおよび液化ガス運搬船 Download PDFInfo
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- WO2014203530A1 WO2014203530A1 PCT/JP2014/003273 JP2014003273W WO2014203530A1 WO 2014203530 A1 WO2014203530 A1 WO 2014203530A1 JP 2014003273 W JP2014003273 W JP 2014003273W WO 2014203530 A1 WO2014203530 A1 WO 2014203530A1
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- WIPO (PCT)
- Prior art keywords
- tank
- liquefied gas
- vacuum
- inner tank
- degree
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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
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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
- B63B25/14—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed pressurised
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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
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/02—Wall construction
- B65D90/028—Wall construction hollow-walled, e.g. double-walled with spacers
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B65—CONVEYING; PACKING; STORING; HANDLING THIN OR FILAMENTARY MATERIAL
- B65D—CONTAINERS FOR STORAGE OR TRANSPORT OF ARTICLES OR MATERIALS, e.g. BAGS, BARRELS, BOTTLES, BOXES, CANS, CARTONS, CRATES, DRUMS, JARS, TANKS, HOPPERS, FORWARDING CONTAINERS; ACCESSORIES, CLOSURES, OR FITTINGS THEREFOR; PACKAGING ELEMENTS; PACKAGES
- B65D90/00—Component parts, details or accessories for large containers
- B65D90/22—Safety features
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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
- F17C3/04—Vessels not under pressure with provision for thermal insulation by insulating layers
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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
- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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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
- F17C2201/00—Vessel construction, in particular geometry, arrangement or size
- F17C2201/05—Size
- F17C2201/054—Size medium (>1 m3)
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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
- F17C2203/00—Vessel construction, in particular walls or details thereof
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- F17C2203/0304—Thermal insulations by solid means
- F17C2203/0308—Radiation shield
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- 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
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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
- 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
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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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0103—Exterior arrangements
- F17C2205/0111—Boxes
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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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/01—Mounting arrangements
- F17C2205/0153—Details of mounting arrangements
- F17C2205/018—Supporting feet
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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
- F17C2205/00—Vessel construction, in particular mounting arrangements, attachments or identifications means
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0323—Valves
- F17C2205/0332—Safety valves or pressure relief valves
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
- F17C2205/03—Fluid connections, filters, valves, closure means or other attachments
- F17C2205/0302—Fittings, valves, filters, or components in connection with the gas storage device
- F17C2205/0379—Manholes or access openings for human beings
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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
- F17C2221/00—Handled fluid, in particular type of fluid
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
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- 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
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- F17C2221/032—Hydrocarbons
- F17C2221/035—Propane butane, e.g. LPG, GPL
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
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- F17C2223/0146—Two-phase
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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
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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- 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 holding tank used for transporting and storing liquefied gas, and a liquefied gas carrier ship equipped with the liquefied gas holding tank.
- Patent Literature 1 discloses a liquefied gas holding tank in which an outer surface of an inner tub is covered with a heat insulating film and an inner surface of the outer tub is covered with a heat insulating layer for preventing leakage.
- the cryogenic liquefied gas has a very low boiling point, so it boils when the degree of vacuum in the vacuum space deteriorates and heat is transferred from the outer tank to the inner tank.
- the heat-insulating layer for preventing leakage in the liquefied gas holding tank disclosed in Patent Document 1 is for preventing such boiling of the liquefied gas. That is, even when the degree of vacuum in the vacuum space is deteriorated, a certain degree of heat insulation is maintained in the liquefied gas holding tank by the heat insulating layer for preventing leakage.
- Patent Document 1 describes that the heat-insulating layer for preventing leakage is made of a foamable heat insulating material.
- a foamable heat insulating material is arranged on the inner side surface of the outer tub, if the degree of vacuum in the vacuum space is high, gas (from the foamable heat insulating material) is formed from the surface of the resin constituting the foamable heat insulating material. Since the gas trapped between the resin molecules, not the air in the voids, comes out over time, the degree of vacuum may deteriorate over time.
- the present invention provides a liquefied gas holding tank capable of suppressing deterioration of the degree of vacuum in the vacuum space with time, and provides a liquefied gas carrier ship equipped with the liquefied gas holding tank. Objective.
- the liquefied gas holding tank of the present invention covers an inner tank that stores liquefied gas, an outer tank that secures a vacuum space between the inner tank, and an outer surface of the outer tank. And an emergency heat insulating layer.
- the emergency heat insulating layer is not disposed in the vacuum space, it is possible to suppress the vacuum degree of the vacuum space from deteriorating with time.
- the liquefied gas holding tank may further include a vacuum region heat insulating layer that is spaced apart from the inner surface of the outer tank and covers the outer surface of the inner tank. According to this configuration, heat transfer due to radiation between the inner tank and the outer tank can be prevented.
- the liquefied gas carrier of the present invention includes the liquefied gas holding tank and a tank cover that wraps the liquefied gas holding tank so as to secure a space between the liquefied gas holding tank and the liquefied gas holding ship.
- An inert gas is sealed in a space between the holding tank and the tank cover.
- the liquefied gas carrier ship has a vacuum degree detector for detecting a vacuum degree in a vacuum space between an inner tank and an outer tank of the liquefied gas holding tank, and a degree of vacuum detected by the vacuum degree detector is a voyage.
- the liquefied gas carrier ship has a relief path for guiding the boil-off gas generated in the inner tank to the outside of the tank cover, and the pressure in the inner tank provided in the escape path is equal to or higher than a predetermined pressure. And a relief valve that opens to the top. According to this configuration, even if the liquefied gas boils in the inner tank and a large amount of boil-off gas is generated, the pressure in the inner tank can be maintained within a predetermined pressure.
- the liquefied gas carrier is provided in the combustion path, a gas combustion unit capable of combusting boil-off gas generated in the inner tank, a combustion path for guiding boil-off gas from the inner tank to the gas combustion unit, And an on-off valve that opens when the pressure in the inner tank becomes equal to or higher than a predetermined pressure.
- the present invention it is possible to suppress the vacuum degree of the vacuum space from deteriorating with time.
- FIG. 1 It is side surface sectional drawing of a part of liquefied gas carrier ship equipped with the liquefied gas holding
- FIG. 1 shows a part of a liquefied gas carrier 1 equipped with a liquefied gas holding tank 2 according to an embodiment of the present invention.
- the liquefied gas holding tank 2 has a horizontal cylindrical shape.
- the liquefied gas holding tank 2 may be spherical.
- the liquefied gas holding tank 2 does not necessarily need to be mounted on the liquefied gas carrier 1, and may be installed on the ground as a tank for a power plant, for example.
- the liquefied gas holding tank 2 may have a cylindrical shape whose axial direction is parallel to the vertical direction, for example.
- the liquefied gas holding tank 2 is arranged so that the axial direction of the tank 2 is parallel to the ship length direction.
- the liquefied gas holding tank 2 is a double shell tank, and includes an inner tank 3 that stores liquefied gas and an outer tank 4 that secures a vacuum space 20 between the inner tank 3.
- the liquefied gas stored in the inner tank 3 is a cryogenic liquefied gas such as liquefied natural gas (LNG, about ⁇ 160 ° C.) or liquefied hydrogen (LH 2 , about ⁇ 250 ° C.).
- the liquefied gas may be a liquefied gas having a relatively high temperature such as liquefied petroleum gas (LPG, about ⁇ 45 ° C.) or liquefied ethylene gas (LEG, about ⁇ 100 ° C.).
- the inner tank 3 includes an inner tank body 31 and an inner tank dome 32.
- the inner tank main body 31 is composed of a trunk portion extending in the lateral direction with a constant cross-sectional shape, and a hemispherical closure portion that closes the openings on both sides of the trunk portion.
- the closing part may be a flat perpendicular to the body part or may be dish-shaped.
- the inner tank dome 32 is a part for collecting pipes penetrating the inner tank 3.
- the inner tank dome 32 protrudes upward from the trunk of the inner tank main body 31.
- the inner tank dome 32 may protrude obliquely upward from, for example, the trunk or the closed part of the inner tank main body 31.
- the outer tub 4 has an outer tub body 41 surrounding the inner tub body 31 and an outer dome 42 surrounding the inner dome 32. That is, the outer tank main body 41 has a shape in which the inner tank main body 31 is enlarged, and the outer tank dome 42 has a shape in which the inner tank dome 32 is enlarged.
- the outer tank main body 41 is supported at a position spaced apart from each other in the axial direction of the tank 2 by, for example, a pair of saddles 13 provided on the ship bottom 11.
- a pair of support members 25 that support the inner tank body 31 at the same position as the saddle 13 are disposed between the inner tank body 31 and the outer tank body 41.
- the inner tank dome 32 and the outer tank dome 42 are provided with manholes 35 and 45 for enabling inspection of the inner tank 3, respectively.
- the manholes 35 and 45 may be provided in the inner tank main body 31 and the outer tank main body 41.
- the liquefied gas holding tank 2 has a vacuum region heat insulating layer 5 for preventing heat transfer due to radiation in the vacuum space 20 and a liquefied gas boiling even when the vacuum degree of the vacuum space 20 deteriorates.
- An emergency heat insulating layer 6 is included.
- the vacuum region heat insulating layer 5 covers the outer surface of the inner tub 3 in close contact with the outer surface while being separated from the inner surface of the outer tub 4, and the emergency heat insulating layer 6 covers the outer surface of the outer tub 4. Covering the outer surface in close contact.
- the vacuum region heat insulating layer 5 is disposed only on the outer surface of the inner tank body 31, but may be disposed on the outer surface of the inner tank dome 32. In other words, the entire outer surface of the inner tub 3 may be covered with the vacuum region heat insulating layer 5.
- the emergency heat insulating layer 6 is disposed on the outer surface of the outer tub main body 41 and the outer surface of the outer tub dome 42, and covers the entire outer surface of the outer tub 4.
- the vacuum region heat insulating layer 5 is formed by alternately laminating radiation shield plates and spacers.
- the radiation shield plate is composed of a synthetic resin sheet and a metal film.
- the metal film is formed, for example, by vapor-depositing aluminum (gold or silver) on the surface of the synthetic resin sheet.
- the spacer is a sheet made of a resin having a low thermal conductivity. As such a sheet, a net, a woven fabric, a non-woven fabric, or the like can be used.
- the vacuum region heat insulation layer 5 is fixed on the outer surface of the inner tub 3 by, for example, a restraining member (for example, a mesh material) wound around the vacuum region heat insulation layer 5.
- the emergency heat insulating layer 6 has a two-layer structure of an inner heat insulating layer 61 and an outer heat insulating layer 63 as shown in FIG.
- a reinforcing material 62 is disposed between the inner heat insulating layer 61 and the outer heat insulating layer 63, and an aluminum plastic sheet 64 is disposed on the surface of the outer heat insulating layer 63.
- the reinforcing member 62 is, for example, a metal mesh, and a washer and a nut seat when the emergency heat insulating layer 6 is fixed using a stat bolt (not shown) provided on the outer surface of the outer tub 4. Function as.
- the inner heat-insulating layer 61 for example, a phenol resin foam that hardly cracks or breaks due to cooling can be used.
- the outer heat-insulating layer 63 for example, a hard polyurethane foam that is easy to handle can be used.
- the liquefied gas carrier 1 is equipped with a tank cover 12 that wraps the liquefied gas holding tank 2 so as to secure a space 10 between the liquefied gas holding tank 2. That is, the tank cover 12 is separated from the emergency heat insulating layer 6 over the entire circumference.
- the tank cover 12 has a shape that opens downward, and forms a sealed space together with the hull (for example, the ship bottom 11 and the bulkhead).
- the tank cover 12 is provided with a manhole 15 at a position corresponding to the manholes 35 and 45 of the liquefied gas holding tank 2.
- An inert gas is sealed in the space 10 between the liquefied gas holding tank 2 and the tank cover 12.
- nitrogen or argon can be used as the inert gas.
- the inert gas enclosed in the space 10 is preferably a dry gas. This is because the emergency heat insulating layer 6 can be kept dry.
- the liquefied gas carrier 1 combusts the liquefied gas as a configuration for maintaining the pressure in the inner tank 3 within a predetermined pressure even when the liquefied gas boils in the inner tank 3 and a large amount of boil-off gas is generated.
- the liquefied gas carrier 1 detects the degree of vacuum (unit: Pa) in the vacuum space 20 between the inner tank 3 and the outer tank 4 and the temperature of the outer tank 4.
- An alarm device 73 and a display 74 are connected to the control device 7.
- the liquefied gas carrier 1 generally employs a large liquefied gas holding tank 2 having a vacuum space 20 with a volume of several hundreds of cubic meters (m 3 ).
- a large liquefied gas holding tank 2 having a vacuum space 20 with a volume of several hundreds of cubic meters (m 3 ).
- the degree of vacuum of the vacuum space 20 varies depending on the location.
- the plurality of vacuum detectors 71 are arranged at appropriate positions.
- the vacuum degree detectors 71 are disposed on both sides of the tank 2 in the axial direction and above and below the tank 2.
- the temperature sensor 72 is used to determine whether or not the deterioration of the degree of vacuum detected by the degree-of-vacuum detector 71 causes the outer tank 4 to change in temperature. For this reason, the temperature sensor 72 is arranged in the vicinity of each vacuum degree detector 71.
- the control device 7 stores at least three set values as the determination criteria for the degree of vacuum.
- the three set values were set to the allowable vacuum limit R0, the vacuum level lower than R0 (the pressure value is larger than R0), the limit of continuous navigation R1, and the lower vacuum level than R1. This is the avoidable navigation limit R2.
- the allowable vacuum limit R0 is a degree of vacuum in which the heat insulation property of the vacuum space 20 may be lowered. When the degree of vacuum is higher than the degree of vacuum tolerance R0 (when the degree of vacuum is smaller than R0), the voyage can be continued safely without operating the vacuum pump 70.
- the allowable vacuum limit R0 can be set according to the volume of the vacuum space 20.
- the continuous voyage limit R1 is a limit value of the degree of vacuum at which the voyage can be continued safely and continuously by operating the vacuum pump 70 continuously or for a certain period of time.
- the continuous navigation limit R1 can be set according to the capacity of the vacuum pump 70 and the volume of the vacuum space 20.
- the continuous voyage limit R1 is also the degree of vacuum at which an evacuated voyage for a liquefied gas carrier in operation to call at the nearest repair facility is started.
- the avoidable voyage limit R2 can be set as a degree of vacuum at which the pressure in the inner tank 3 does not reach the design pressure during the voyage days required for the liquefied gas carrier to avoid voyage.
- the avoidable navigation limit R2 can be set in consideration of the capability of the combustion system 9 and the pressure value in the inner tank 3 in addition to the capability of the vacuum pump 70 and the volume of the vacuum space 20.
- the control device 7 outputs to the display 74 a vacuum level signal corresponding to the minimum value of the vacuum level detected by the vacuum level detector 71 (the value at the place where the vacuum level is most deteriorated).
- the indicator 74 includes a needle 74 a, a normal voyage area 75 and a quasi-normal voyage area 76 that are navigable areas, and an avoidance voyage area 77 and an abnormal voyage area 78 that are necessary port calls.
- the display plate 74b is provided, and the needle 74a is moved in conjunction with the vacuum level signal to display in which region the detected vacuum level is.
- the display device 74 functions as a notification device that notifies whether the degree of vacuum detected by the degree-of-vacuum detector 71 is in a voyageable area or a port-necessary area. As a result, the vessel operator can easily determine whether to continue the voyage or to call at the port. In particular, if the display device 74 is used as in this embodiment, the determination can be understood at a glance.
- the above-described allowable vacuum limit R0 is at the boundary between the normal voyage area 75 and the quasi-normal voyage area 76
- the continuous voyage limit R1 is at the boundary between the quasi-normal voyage area 76 and the avoidance voyage area 77
- the avoidance voyage limit R2 is It is at the boundary between the avoidance voyage area 77 and the abnormal voyage area 78.
- the control device 7 outputs an alarm signal to the alarm device 73 and causes the alarm device 73 to issue an alarm when the minimum value of the vacuum level detected by the vacuum level detector 71 exceeds the allowable vacuum limit R0. Then, the vacuum pump 70 is operated. By checking the display 74, the ship operator can understand that there is no problem even if the voyage is continued.
- the control device 7 When the vacuum degree of the vacuum space 20 continues to deteriorate even when the vacuum pump 70 is operated, and the minimum value of the vacuum degree detected by the vacuum degree detector 71 exceeds the continuous voyage limit R1, the control device 7 Again, an alarm signal is output to the alarm device 73 to cause the alarm device 73 to issue an alarm.
- the alarm at this time may be the same as the alarm when the allowable vacuum limit R0 is exceeded, but is preferably different.
- the control device 7 Outputs an abnormal alarm signal to the alarm device 73 and causes the alarm device 73 to issue an abnormal alarm.
- control device 7 calculates the detection values obtained by the vacuum degree detector 71 and the temperature sensor 72, the average value and the average time differential value in the sample time, and from these calculated values, each degree of vacuum is calculated. It may have a function of predicting the time to reach the vacuum limit.
- Navigation determination refers to, for example, determination of repair timing or change of operation schedule.
- the amount of suction by the vacuum pump and the amount of leakage due to the atmospheric temperature may be considered.
- the combustion system 9 described above includes a gas combustion unit (GCU) 90 capable of combusting boil-off gas generated in the inner tank 3, and a combustion path 91 for guiding the boil-off gas from the inner tank 3 to the gas combustion unit 90.
- the combustion path 91 is provided with an on-off valve 92 that opens when the pressure in the inner tank 3 becomes equal to or higher than the first set pressure (predetermined pressure of the present invention).
- the on-off valve 92 may be a relief valve that automatically opens according to the pressure in the inner tank 3.
- the on-off valve 92 is an electromagnetic valve, and is provided with a pressure gauge for detecting the pressure in the inner tub 3, and the control device when the pressure detected by the pressure gauge becomes equal to or higher than the first set pressure. 7, the on-off valve 92 may be opened.
- the atmosphere release system 8 includes an escape path 81 that guides boil-off gas generated in the inner tank 3 to the outside of the tank cover 12.
- the relief passage 81 is provided with a relief valve 82 that opens when the pressure in the inner tank 3 becomes equal to or higher than the second set pressure (predetermined pressure of the present invention).
- the combustion system 9 when the second set pressure is larger than the first set pressure, the degree of vacuum in the vacuum space 20 deteriorates and boil-off gas continues to be generated in the inner tank 3, the combustion system 9 operates first,
- the atmosphere release system 8 is preliminarily activated.
- the first set pressure is a pressure when the degree of vacuum of the vacuum space 20 is in the avoidance voyage region 77
- the second set pressure is a value when the degree of vacuum of the vacuum space 20 is in the abnormal voyage region 78. Pressure.
- the first set pressure may be larger than the second set pressure, the atmosphere release system 8 may be operated first, and the combustion system 9 may be operated preliminarily. It is also possible to employ only one of the air release system 8 and the combustion system 9.
- the liquefied gas carrier 1 may be provided with a dumping system that dumps the liquefied gas to the sea when the boil-off gas treatment is insufficient even by the atmosphere release system 8.
- the pressure when the liquefied gas is dumped on the sea is the pressure when the degree of vacuum of the vacuum space 20 is within the abnormal voyage region 78.
- the emergency heat insulating layer 6 is not disposed in the vacuum space 20, so that the degree of vacuum of the vacuum space 20 is prevented from deteriorating with time. be able to. And since the emergency heat insulation layer 6 prevents the boiling of the liquefied gas when the vacuum degree of the vacuum space 20 is deteriorated, a full secondary barrier (a separate vacuum space outside the vacuum space 20). There is no need to provide. Furthermore, in this embodiment, since the outer surface of the inner tank 3 is covered with the vacuum region heat insulating layer 5, heat transfer due to radiation between the inner tank and the outer tank can be prevented.
- the vacuum region heat insulating layer 5 may be omitted.
- the notification device informs by voice whether the degree of vacuum detected by the degree-of-vacuum detector 71 is in a navigable area or in a port-required area.
- An audible device can be used.
- the liquefied gas holding tank of the present invention is useful not only as a tank mounted on a liquefied gas carrier ship but also as a tank installed on the ground.
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- Physics & Mathematics (AREA)
- Thermal Sciences (AREA)
- General Engineering & Computer Science (AREA)
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- Ocean & Marine Engineering (AREA)
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Abstract
Description
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。
10 空間
12 タンクカバー
2 液化ガス貯蔵タンク
20 真空空間
3 内槽
4 外槽
5 真空域断熱層
6 非常用断熱層
71 真空度検出器
74 表示器(通知装置)
75 正常航海領域(航海可能領域)
76 準正常航海領域(航海可能領域)
77 回避航海領域(寄港必要領域)
78 異常航海領域(寄港必要領域)
81 逃し路
82 リリーフ弁
90 ガス燃焼ユニット
91 燃焼路
92 開閉弁
Claims (6)
- 液化ガスを貯留する内槽と、
前記内槽との間に真空空間を確保する外槽と、
前記外槽の外側面を覆う非常用断熱層と、
を備える、液化ガス保持タンク。 - 前記外槽の内側面から離間して前記内槽の外側面を覆う真空域断熱層をさらに備える、請求項1に記載の液化ガス保持タンク。
- 請求項1または2に記載の液化ガス保持タンクと、
前記液化ガス保持タンクとの間に空間を確保するように前記液化ガス保持タンクを包み込むタンクカバーと、を備え、
前記液化ガス保持タンクと前記タンクカバーの間の空間には不活性ガスが封入されている、液化ガス運搬船。 - 前記液化ガス保持タンクの内槽と外槽の間の真空空間の真空度を検出するための真空度検出器と、
前記真空度検出器によって検出される真空度が航海可能領域にあるか寄港必要領域にあるかを通知する通知装置と、
をさらに備える、請求項3に記載の液化ガス運搬船。 - 前記内槽内で発生するボイルオフガスを前記タンクカバーの外部へ導く逃し路と、
前記逃し路に設けられた、前記内槽内の圧力が所定圧力以上となったときに開くリリーフ弁と、
をさらに備える請求項3または4に記載の液化ガス運搬船。 - 前記内槽内で発生するボイルオフガスを燃焼可能なガス燃焼ユニットと、
前記内槽から前記ガス燃焼ユニットへボイルオフガスを導く燃焼路と、
前記燃焼路に設けられた、前記内槽内の圧力が所定圧力以上となったときに開く開閉弁と、
をさらに備える、請求項3~5のいずれか一項に記載の液化ガス運搬船。
Priority Applications (6)
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KR1020157035767A KR101865210B1 (ko) | 2013-06-21 | 2014-06-18 | 액화 가스 저장 탱크 및 액화 가스 운반선 |
US14/900,274 US10317010B2 (en) | 2013-06-21 | 2014-06-18 | Liquefied gas storage tank and liquefied gas carrier ship |
EP14814324.1A EP3012510B1 (en) | 2013-06-21 | 2014-06-18 | Liquefied gas-storing tank and liquefied gas transport vessel |
CN201480033003.3A CN105308381B (zh) | 2013-06-21 | 2014-06-18 | 液化气体保持罐以及液化气体搬运船 |
JP2015522560A JP6212553B2 (ja) | 2013-06-21 | 2014-06-18 | 液化ガス保持タンクおよび液化ガス運搬船 |
BR112015030860A BR112015030860A2 (pt) | 2013-06-21 | 2014-06-18 | tanque de estocagem de gás liquefeito e navio de transporte de gás liquefeito |
Applications Claiming Priority (2)
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JP2013-130902 | 2013-06-21 | ||
JP2013130902 | 2013-06-21 |
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WO2014203530A1 true WO2014203530A1 (ja) | 2014-12-24 |
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PCT/JP2014/003273 WO2014203530A1 (ja) | 2013-06-21 | 2014-06-18 | 液化ガス保持タンクおよび液化ガス運搬船 |
Country Status (7)
Country | Link |
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US (1) | US10317010B2 (ja) |
EP (1) | EP3012510B1 (ja) |
JP (2) | JP6212553B2 (ja) |
KR (1) | KR101865210B1 (ja) |
CN (1) | CN105308381B (ja) |
BR (1) | BR112015030860A2 (ja) |
WO (1) | WO2014203530A1 (ja) |
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Also Published As
Publication number | Publication date |
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CN105308381A (zh) | 2016-02-03 |
EP3012510A4 (en) | 2017-02-22 |
US20160341360A1 (en) | 2016-11-24 |
JP6405420B2 (ja) | 2018-10-17 |
KR20160009680A (ko) | 2016-01-26 |
US10317010B2 (en) | 2019-06-11 |
KR101865210B1 (ko) | 2018-06-07 |
BR112015030860A2 (pt) | 2017-07-25 |
JP6212553B2 (ja) | 2017-10-11 |
CN105308381B (zh) | 2017-06-09 |
EP3012510A1 (en) | 2016-04-27 |
JPWO2014203530A1 (ja) | 2017-02-23 |
JP2017194166A (ja) | 2017-10-26 |
EP3012510B1 (en) | 2019-11-13 |
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