WO2016097461A1 - Réservoir de gaz naturel liquéfié - Google Patents

Réservoir de gaz naturel liquéfié Download PDF

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Publication number
WO2016097461A1
WO2016097461A1 PCT/FI2014/051012 FI2014051012W WO2016097461A1 WO 2016097461 A1 WO2016097461 A1 WO 2016097461A1 FI 2014051012 W FI2014051012 W FI 2014051012W WO 2016097461 A1 WO2016097461 A1 WO 2016097461A1
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WO
WIPO (PCT)
Prior art keywords
lng tank
metal shell
lng
tank
vacuum
Prior art date
Application number
PCT/FI2014/051012
Other languages
English (en)
Inventor
Viktor BERGMAN
Mathias Jansson
Martin RÅHOLM
Original Assignee
Wärtsilä Finland Oy
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 Wärtsilä Finland Oy filed Critical Wärtsilä Finland Oy
Priority to PCT/FI2014/051012 priority Critical patent/WO2016097461A1/fr
Publication of WO2016097461A1 publication Critical patent/WO2016097461A1/fr

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Classifications

    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F17C3/02—Vessels not under pressure with provision for thermal insulation
    • F17C3/025—Bulk storage in barges or on ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/01—Shape
    • F17C2201/0104—Shape cylindrical
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2201/00—Vessel construction, in particular geometry, arrangement or size
    • F17C2201/03—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
    • F17C2201/054—Size medium (>1 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
    • F17C2203/0391—Thermal insulations by vacuum
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2203/00—Vessel construction, in particular walls or details thereof
    • F17C2203/06—Materials for walls or layers thereof; Properties or structures of walls or their materials
    • F17C2203/0602—Wall structures; Special features thereof
    • F17C2203/0607—Coatings
    • 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
    • F17C2203/0634—Materials for walls or layers thereof
    • F17C2203/0636—Metals
    • F17C2203/0639—Steels
    • F17C2203/0643—Stainless steels
    • 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
    • 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
    • F17C2209/225—Spraying
    • 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
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/035—Propane butane, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/03—Dealing with losses
    • F17C2260/031—Dealing with losses due to heat transfer
    • 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

Definitions

  • the invention is in general related to the field of storing liquid fuel, in particular liquefied natural gas (LNG), as a marine fuel in one or more engines of a ship or of a corresponding sea-going vessel.
  • LNG liquefied natural gas
  • the invention is related to LNG tanks and connecting pipes to an LNG tank. More particularly the invention relates to the LNG tank according to the preamble of the independent LNG tank claim.
  • Liquid fuels that are used as marine fuels are typically liquefied natural gas, liquefied petroleum gas or liquid petroleum gas (LPG), methanol, ethylene.
  • Natural gas is in gaseous form in room temperature. In ships that use natural gas as fuel, the natural gas is typically stored onboard in liquid form, and thus this marine fuel is commonly called by its acronym LNG (Liquefied Natural Gas). Natural gas can be kept in liquid form by maintaining its temperature be- low a boiling point, which is approximately -163 °C.
  • LNG system onboard comprises typically a bunkering station, which is the ship's connection with a LNG terminal on shore or with an LNG bunkering barge, insulated pipes for leading LNG to an LNG tank, which is for storage of LNG and a tank connection space where LNG is controllably evaporated and its distribution to the en- gine(s) is arranged.
  • LNG tank is a cylindrical, double-walled or single- walled, insulated stainless steel tank.
  • the LNG tank is usually the most expensive item in the LNG fuel handling system, taking up even 50-60% of the total cost of the system.
  • double-walled structure is typically used, with a vacuum generated between the shells for heat insulation with possible perlite insulation.
  • the inner wall is stainless steel and the outer wall can be either stainless steel or carbon steel.
  • a tank room or a tank connection space is associated with a storage tank and contains the equipment to convert the liquid into a gas for safe delivery to the engines.
  • the tank room is also considered a 'secondary barrier' in case there should be leakage of the LNG, since liquid pipes and valves are inside it.
  • an LNG tank having an inner shell of stainless steel and an outer shell spaced at a distance from the inner shell, the said inner and outer shells defining an isolation space there between.
  • the tank consists of a stainless steel inner shell, which is de- signed for an internal pressure, and an outer shell that acts as a secondary barrier.
  • the outer shell can be made of either stainless steel or nickel steel.
  • the tank is insulated with perlite/vacuum.
  • Natural gas is a safe fuel when the right precautions are taken. Neither is LNG in a liquid state explosive, corrosive or toxic. Thus, possible spillages will not cause any lasting contamination, as the liquid will evaporate as gas.
  • a marine vessel refers to a ship, or other floating structure, such as an off-shore structure.
  • One important problem to be solved relates to the scenario of loss of vacuum in double shelled storage tanks.
  • loss of vacuum the insulation properties will be significantly reduced, which causes the temperature of the outer shell to drastically decrease.
  • a reduced temperature on the outer shell will conduct coldness to the surrounding walls of a tank hold space and to other surrounding structures of the marine vessel.
  • a tank hold refers to a compartment inside the marine vessel hull that surrounds the LNG tank and the tank connection space.
  • the surrounding structures are not constructed of a cold resistant material such as stainless steel, which is expensive, the problem is to be solved so that the temperature of the surrounding structures will not reach the temperature limitations of the material.
  • the leakage scenario shall be calculated with a -163°C outer shell temperature.
  • Another object of the invention is to prevent any leakage and cold temperatures related problems in connection with an LNG tank.
  • Another object of the invention is to create a double-shell LNG tank with more LNG space within a certain space.
  • the LNG tank located in a tank hold space of a marine vessel comprises a inner metal shell, an outer metal shell and an isolation space between the shells containing vacuum, where in the LNG tank further comprises an insulation material adhered on the outer surface of the outer metal shell.
  • the insulation material adhered on the outer surface of the outer metal shell substantially covers the outer surface of the outer shell of the LNG tank.
  • the insulation material adhered on the outer surface of the outer metal shell is polyurethane (PUR) or other corresponding onto the outer surface of the outer shell of the LNG tank sprayed insulating foam.
  • thermal conductivity (NPT) of the PUR is: below 0.2 W/m * k and density is 1 10- 130 kg/m3.
  • the insulation material adhered on the outer surface of the outer metal shell is formed of at least one insulation panel, advantageously several insulation panels, substantially covering the outer surface of the outer shell of the LNG tank.
  • the insulation material adhered on the outer surface of the outer metal shell is formed of several insulation panels forming a substantially continuous insulation material layer onto the outer surface of the outer shell of the LNG tank.
  • the insulation material adhered on the outer surface of the outer metal shell comprises at least one insulation panel and polyurethane (PUR) or other corresponding onto the outer surface of the outer shell of the LNG tank sprayed insulating foam.
  • PUR polyurethane
  • the isolation space between the inner metal shell and the outer metal shell containing vacuum is perlite filled.
  • the inner metal shell is stainless steel and the outer metal shell is stainless steel.
  • the insulation panels are vacuum insulated panels (VIP) comprising vacuum inside a reflective layer.
  • VI Ps vacuum insulated panels
  • the VI Ps can be of different shapes and are mounted on the outside of the outer shell.
  • Advantageously thermal conductivity (NPT) of the VIPS is: below 0.0023 W/m * k and density is 270 - 290 kg/m3.
  • NPT thermal conductivity
  • the isolation space between the tank shells is 250 - 350 mm thick, and comprises vacuum filled with perlite.
  • the insulation thickness of the insulation material formed of vacuum insulated panels adhered on the outer surface of the outer shell of the LNG tank is 30-70 mm.
  • surrounding structures of the LNG tank comprise at least one wall or floor of a tank connection space i.e. a tank room and the material of the surrounding structure is DNV grade A steel (NV A steel).
  • a marine vessel comprises an LNG tank according to the invention.
  • the LNG tank comprises the insulation of the outer shell surface, in the case of loss or reduction of vacuum from the isolation space between the shells of the LNG tank, the insulation prevents the reduced temperature on the outer shell to conduct coldness to the surrounding structures and thus the temperatures of the surrounding structures remain within the temperature limi- tations of the material even in the worst case scenario with a -163°C outer shell temperature of the LNG tank.
  • the insulation of the outer shell surface of the LNG tank also reduces the requirement of the distance between the shells as the outer insulation decreases capacity needed of the isolation space between the shells.
  • the insulation of the outer shell surface of the LNG tank also makes it possible to reduce the distance from the outer surface of the tank to the walls of the tank room due to the improved insulation achieved by the insulation of the outer shell surface.
  • Fig. 1 shows schematically a prior art LNG fuel distribution architecture and Figs 2 - 3 show schematically an advantageous example of the invention.
  • Fig. 1 illustrates schematically the architecture of a known system onboard an LNG-fuelled ship.
  • An LNG bunkering station 101 is located on the deck and used to fill up the system with LNG.
  • the LNG fuel storage system comprises one or more thermally insulated gas tanks 102 for storing the LNG in liquid form, and the so-called tank room 103 where the LNG is controllably evapo- rated and its distribution to the engine(s) is arranged.
  • the LNG tank 102 and the tank room 103 are located in a tank hold space 16 of a marine vessel.
  • Evaporation means a phase change from liquid to gaseous phase, for which reason all subsequent stages should leave the L for liquefied out of the acronym and use only NG (Natural Gas) instead.
  • the engine 104 or engines of the ship are located in an engine room 105. Each engine has its respective engine-specific fuel input subsystem 106, which in the case of gaseous fuel is in some sources referred to as the GVU (Gas Valve Unit).
  • the tank room 103 of fig. 1 comprises two evaporators, of which the first evaporator 107 is the so-called PBU (Pressure Build-Up) evapo- rator used to maintain a sufficient pressure inside the gas tank 102.
  • PBU Pressure Build-Up
  • Hydrostatic pressure at the inlet of a main supply line 108 inside the gas tank 102 is the driving force that makes the LNG flow into the second evaporator 109, which is the MGE or Main Gas Evaporator from which the fuel is distributed in gaseous form towards the engines.
  • the PBU system maintains the internal pressure of the gas tank 102 at or close to a predetermined value, which is typically between 5 and 7 bars.
  • the engine 104 comprises one or more cooling circuits. Schematically shown in fig. 1 is an external loop 1 10 of the so-called low temperature (LT) cooling circuit, which may be used for example to cool lubricating oil.
  • LT low temperature
  • the so-called LT water that circulates in the external loop 1 10 may have a temperature around 50 degrees centigrade when it goes through a heat exchanger 1 1 1 , in which it donates heat to a mixture of glycol and water that in turn transfers heat to the evaporators 107 and 109.
  • the glycol / water mixture circuit comprises a circulation pump 1 12 and an expansion tank 1 13. Glycol is needed in the mixture to prevent it from freezing when it comes into contact with the extremely cold LNG inlet parts of the evaporators 107 and 109.
  • the LNG tank 10 is a double-shell LNG tank and comprises an inner shell 1 1 defining the tank space for the LNG and an outer shell 12.
  • the level of the LNG is denoted by reference sign L.
  • the isolation space 13 is located between the inner shell 1 1 and the outer shell 12 .
  • insulation material 15 is adhered on the outer surface 14 of the outer shell 12 .
  • the insulation material 15 is advanta- geously VIP (vacuum insulated panels) and/or PUR (polyurethane).
  • the insulation material 15 adhered on the outer surface 14 of the outer metal shell 12 substantially covers the outer surface 14 of the outer shell 12 of the LNG tank 10.
  • the isolation space 13 between the inner metal shell 1 1 and the outer metal shell 12 advantageously contains vacuum.
  • the isolation space 13 is ad- vantageously perlite filled and it comprises 250 - 350 mm perlite.
  • the insula- tion thickness of the insulation material 15 in case formed of vacuum insulated panels adhered on the outer surface 14 of the outer shell 12 of the LNG tank 10 is 30-70 mm.
  • the deck 18 below the LNG tank 10 located in a tank connection space i.e. a tank room is typically DNV grade A steel (NV A steel).

Abstract

Cette invention concerne un réservoir de GNL (10) disposé dans un espace d'accueil de réservoir (16) d'un navire, comprenant une enveloppe métallique interne (11), une enveloppe métallique externe (12) et un espace d'isolation (13) entre les enveloppes (11,12), contenant avantageusement du vide, ledit réservoir de GNL (10) comprenant en outre un matériau d'isolation (15) collé sur surface extérieure (14) de l'enveloppe métallique externe (12).
PCT/FI2014/051012 2014-12-16 2014-12-16 Réservoir de gaz naturel liquéfié WO2016097461A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
PCT/FI2014/051012 WO2016097461A1 (fr) 2014-12-16 2014-12-16 Réservoir de gaz naturel liquéfié

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
PCT/FI2014/051012 WO2016097461A1 (fr) 2014-12-16 2014-12-16 Réservoir de gaz naturel liquéfié

Publications (1)

Publication Number Publication Date
WO2016097461A1 true WO2016097461A1 (fr) 2016-06-23

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PCT/FI2014/051012 WO2016097461A1 (fr) 2014-12-16 2014-12-16 Réservoir de gaz naturel liquéfié

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3287685A1 (fr) * 2016-08-26 2018-02-28 ABH Ingenieur-Technik GmbH Récipient thermique pour fluides sensibles à la température
WO2018065658A1 (fr) 2016-10-05 2018-04-12 Wärtsilä Finland Oy Unité de stockage de carburant

Citations (5)

* Cited by examiner, † Cited by third party
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FR2967130A1 (fr) * 2010-11-04 2012-05-11 New Generation Natural Gas Inertage et ventilation sous argon de cuves de navires methaniers a membranes
WO2013128063A1 (fr) 2012-02-29 2013-09-06 Wärtsilä Finland Oy Réservoir de gnl
WO2014127840A1 (fr) * 2013-02-25 2014-08-28 Olaf Berghoff Réservoir pour fluides cryogéniques
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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0440031A1 (fr) * 1990-01-12 1991-08-07 Nisshinbo Industries, Inc. Réservoir isolé sous vide contre la chaleur
FR2967130A1 (fr) * 2010-11-04 2012-05-11 New Generation Natural Gas Inertage et ventilation sous argon de cuves de navires methaniers a membranes
WO2013128063A1 (fr) 2012-02-29 2013-09-06 Wärtsilä Finland Oy Réservoir de gnl
WO2014127840A1 (fr) * 2013-02-25 2014-08-28 Olaf Berghoff Réservoir pour fluides cryogéniques
WO2014203530A1 (fr) * 2013-06-21 2014-12-24 川崎重工業株式会社 Cuve de stockage de gaz liquéfié et moyen de transport de gaz liquéfié

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP3287685A1 (fr) * 2016-08-26 2018-02-28 ABH Ingenieur-Technik GmbH Récipient thermique pour fluides sensibles à la température
WO2018065658A1 (fr) 2016-10-05 2018-04-12 Wärtsilä Finland Oy Unité de stockage de carburant

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