EP3710741B1 - Vorrichtung zur inertisierung eines flüssiggasspeichertanks für ein schiff zum transport dieses gases - Google Patents

Vorrichtung zur inertisierung eines flüssiggasspeichertanks für ein schiff zum transport dieses gases Download PDF

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EP3710741B1
EP3710741B1 EP18799789.5A EP18799789A EP3710741B1 EP 3710741 B1 EP3710741 B1 EP 3710741B1 EP 18799789 A EP18799789 A EP 18799789A EP 3710741 B1 EP3710741 B1 EP 3710741B1
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Prior art keywords
tank
nitrogen
space
line
primary
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English (en)
French (fr)
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EP3710741A1 (de
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Fabrice Lombard
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Gaztransport et Technigaz SA
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Gaztransport et Technigaz SA
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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
    • F17C1/00—Pressure vessels, e.g. gas cylinder, gas tank, replaceable cartridge
    • F17C1/002—Storage in barges or on ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/004—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
    • F17C13/00—Details of vessels or of the filling or discharging of vessels
    • F17C13/002—Details of vessels or of the filling or discharging of vessels for vessels 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
    • 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
    • F17C2203/0358—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
    • 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
    • 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
    • F17C2205/0382—Constructional details of valves, regulators
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/01—Pure fluids
    • F17C2221/014—Nitrogen
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—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
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/01—Propulsion of the fluid
    • F17C2227/0121—Propulsion of the fluid by gravity
    • 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/04—Methods for emptying or filling
    • F17C2227/044—Methods for emptying or filling by purging
    • 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
    • F17C2260/035—Dealing with losses of fluid
    • F17C2260/037—Handling leaked fluid
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2270/00—Applications
    • F17C2270/01—Applications for fluid transport or storage
    • F17C2270/0102—Applications for fluid transport or storage on or in the water
    • F17C2270/0105—Ships
    • F17C2270/0107—Wall panels

Definitions

  • the invention relates to a device for inerting a liquefied gas storage tank for a vessel transporting this gas, as well as a vessel comprising at least one such device.
  • the invention can in particular be applied to the inerting of a membrane tank which is used for the storage of liquefied natural gas (LNG).
  • LNG liquefied natural gas
  • the state of the art includes documents FR-A1-3 014 197 and FR-A1-2 317 159 .
  • a liquefied gas transport ship comprises one or more sealed and thermally insulating tanks for the storage of liquefied natural gas.
  • Each tank comprises a tank wall having successively, in the direction of the thickness, from the inside towards the outside of the tank, a primary sealing membrane intended to be in contact with the liquefied natural gas, a thermal barrier primary insulating membrane, a secondary sealing membrane, a secondary thermally insulating barrier and a supporting structure defining the general shape of the tank.
  • the primary and secondary sealing membranes delimit between them a primary space which contains the primary insulating barrier and which is intended to be filled with an inert gas, generally nitrogen. Inert gas also supplies the secondary space defined by the secondary sealing membrane.
  • the supporting structure of the tank is formed on the one hand by watertight transverse partitions called “cofferdam” located on at least two opposite sides of the tank, and a bottom of the tank which extends under the tank and defines with the latter a passage through which fluids such as condensation water or LNG can flow in the event of a leak. These fluids generally flow by gravity into a drainage box before being evacuated.
  • the sealing membranes of such a tank can in fact present leaks causing the passage of liquefied natural gas from inside the tank. towards thermally insulating barriers, primary and secondary.
  • a combustible gas is in the presence of an oxidizing gas and the concentration of combustible gas is in a concentration range between its lower explosive limit (LEL) and its upper explosive limit (UEL ) and the oxidizing gas is within an appropriate concentration range, the combustible gas is liable to ignite and explode.
  • LEL lower explosive limit
  • UEL upper explosive limit
  • each of the primary and secondary spaces is connected to a nitrogen line which makes it possible to supply the space with nitrogen but also to evacuate the nitrogen from this space. It is therefore a bi-directional line which is connected to a space at the level of one or two fluidic communication ports.
  • the tank can be completely “buried” and be covered by the double deck of the ship.
  • the inner and outer casings of the vessel protrude over the double deck of the ship to form vapor and liquid domes which take the form of two turrets or chimneys intended to pass cargo handling equipment for handling a liquid phase and a vapor phase of the liquefied gas contained in the tank.
  • a tank is equipped with such valves to prevent overpressure in the primary and secondary spaces.
  • the valves In the first technology above, the valves must pass through the upper double deck to be connected to the spaces.
  • crossings of the double deck and of the vessel's supporting structure must be avoided because they can facilitate leaks and lead to significant additional cost in the design and construction of the vessel.
  • the present invention proposes an improvement making it possible in particular, in a simple, effective and economical manner, to allow the inerting of a secondary space of any type of tank without a dedicated crossing of its supporting structure.
  • the invention provides an inerting device according to claim 1.
  • the invention thus proposes to connect the nitrogen line to the secondary space via the drainage box.
  • the drainage box is connected to the passage extending between the bottom of the tank and the outer casing to be able to collect the fluids which are likely to flow in this passage.
  • the drain box is further connected to the secondary space to provide fluid communication between the nitrogen line and the secondary space.
  • the secondary space therefore no longer needs to be equipped with ports dedicated to the connection with the nitrogen line, which simplifies the design of the tank.
  • the nitrogen line can have a dual function, namely supplying the secondary space with nitrogen with a view to inerting it, but also supplying the drainage box itself with nitrogen. Accidental explosions are thus avoided both in the secondary space and the drainage box which is likely to receive LNG in the event of a leak.
  • the supply of nitrogen to the secondary space via the drainage box also makes it possible to facilitate the evacuation of gas, such as methane, from the secondary space. This gas is then expelled from the secondary space by the nitrogen which, because of its lightness compared to the methane, will tend to expel the methane towards the top of the tank where a fluidic communication port is generally located.
  • gas such as methane
  • the present invention also relates to a vessel for transporting liquefied gas, comprising at least one device as described above.
  • each wall of the tank 1 comprises a multilayer structure comprising, from the outside towards the inside of the tank 1, a support structure 2 defining the general shape of the tank 1, a secondary thermally insulating barrier 3 comprising insulating elements resting against the load-bearing structure 2, a secondary sealing membrane 4, a primary thermally insulating barrier 5 comprising insulating elements resting against the secondary sealing membrane 4 and a primary sealing membrane 6 intended to be in contact with the liquefied combustible gas contained in tank 1.
  • the term "primary space” refers to the space containing the primary insulating thermal barrier 5, and "secondary space” to the space containing the secondary insulating thermal barrier 3.
  • the primary insulating thermal barrier 5 forms an internal envelope which is surrounded by the external envelope formed by the secondary insulating thermal barrier 3, and which is itself surrounded by the load-bearing structure 2.
  • the load-bearing structure 2 can in particular be a self-supporting metal sheet and/or be formed by the hull or the double hull of a ship.
  • the thermally insulating barriers 3, 5 comprise solid insulating materials and a gas phase.
  • the thermally insulating barriers 3, 5 are formed from insulated boxes, not shown.
  • the boxes comprise a bottom panel and a lid panel, for example made of plywood, and a plurality of spacers interposed between the bottom and lid panels. Compartments for housing a thermal insulation are provided between the spacing elements.
  • the heat-insulating lining can be made of any material having suitable thermal insulation properties.
  • the heat insulating lining is chosen from materials such as perlite, glass wool, polyurethane foam, polyethylene foam, polyvinyl chloride foam, aerogels or others.
  • the primary and secondary sealing membranes 4, 6 are gas and liquid tight.
  • the supporting structure 2 is also sealed. Therefore, within the meaning of the present description and of the claims, the term “tight barrier” covers both the sealing membranes 4, 6 and the supporting structure 2.
  • the secondary thermally insulating barrier 3 is arranged in a sealed space which is isolated from the ambient pressure, on the one hand, by a first sealed barrier consisting of the secondary sealing membrane 4, on the other hand, by a second sealed barrier formed by the supporting structure 2.
  • the liquefied gas comprises a chemical body or a mixture of chemical bodies which has been placed in a liquid phase at low temperature and which is in a vapor phase under normal conditions of temperature and pressure.
  • the liquefied gas 3 can in particular be a liquefied natural gas (LNG), that is to say a gas mixture mainly comprising methane as well as one or more other hydrocarbons, such as ethane, propane, n- butane, 'l-butane, n-pentane, i-pentane and nitrogen in a small proportion.
  • Liquefied natural gas is stored at atmospheric pressure at a temperature of approximately -162°C.
  • the liquefied gas can also be ethane or a liquefied petroleum gas (LPG), that is to say a mixture of hydrocarbons resulting from petroleum refining comprising essentially propane and n-butane.
  • LPG liquefied petroleum gas
  • the fuel gas can also be ethylene.
  • the inerting device aims more particularly to ensure the inerting of the secondary space.
  • the inerting device further comprises inert gas injection equipment 11 making it possible to sweep the thermally insulating barrier 3 with an inert gas.
  • the injection equipment 11 comprises a pressurized inert gas generator 12 connected to an inert gas supply pipe 14 opening inside the secondary space.
  • the pressurized inert gas generator 12 is connected to the pipe 14 by a valve 16 making it possible to regulate the flow rate and/or the pressure of the injection of inert gas inside the thermally insulating barrier 3.
  • the inert gas is preferentially nitrogen and more precisely dinitrogen or a mixture containing this gas.
  • the pipe 14 can also be equipped with an additional, optional pump 13 to ensure the injection of inert gas from the inert gas generator 12.
  • the invention proposes an improvement to this technology consisting in supplying the secondary space of the tank with dinitrogen via the drainage box 20 of this tank (cf. figure 2 ).
  • the drainage box 20 is located under the tank 1 and is connected to a passage 22 extending between the bottom of the tank 2a of the support structure 2 and the outer casing so that fluids can flow by gravity from the bottom tank to the drain box.
  • the box 20 is thus connected to one end of a first conduit 24 whose opposite end opens onto an upper surface of the bottom of the vessel.
  • Box 20 is also connected to a end of a second pipe 26 for the evacuation of the fluids collected towards the outside of the box, this second pipe being able to be equipped with a valve 28.
  • the reference 23 designates a peripheral cord which is arranged in space and which makes it possible to guide the fluids to the drainage box 20.
  • the cord is for example made of polymerizable resin and can extend continuously over the entire circumference. of the bottom of the tank 2a so that the fluids which run off the peripheral walls of the support structure 2 are then routed to the drainage box.
  • the bead could be produced by metal sections.
  • the reference 30 designates the nitrogen line of the secondary space, that is to say the line which allows both the supply of nitrogen to the secondary space and the evacuation of nitrogen from this space. , that is to say in other words the circulation of nitrogen in the secondary space.
  • This nitrogen line 30 is thus bi-directional and can therefore be considered as fulfilling the functions of pipes 8 and 14 of the figure 1 .
  • the nitrogen line 30 here opens directly into the drainage box 20 and its pipe 24 connecting to the passage 22 is also configured to be in fluid communication with the secondary space.
  • the end of the pipe 24 located at the level of the passage 22 can be extended and have a first orifice opening into the passage 22 and a second orifice opening into the secondary space.
  • the secondary space could be in fluid communication with the passage 22 through at least one orifice provided in the outer casing and opening into the secondary space.
  • the figures 3 to 5 relate to a first type of tank known under the name "NO96” and the figures 6 and 7 relate to a second type of tank known as "Mark”.
  • the double upper deck 2b of the ship of the supporting structure 2 of a NO96 tank covers the entire tank, which is also isolated from other tanks or from the rest of the ship by watertight transverse bulkheads 2c called "cofferdam".
  • the secondary space of the tank 1 is equipped with two pilot-operated safety valves 32 whose purpose is to prevent overpressure in this space.
  • the primary space of tank 1 is also equipped with one or two pilot-operated safety valves.
  • a problem of the prior art is related to the distance between the source of overpressure (the nitrogen line 30) and the valves 32.
  • the sudden appearance of a strong flow of nitrogen could induce a certain latency, due to pressure drops, causing the valve to not yet detect the overpressure. In such a case, the valve would not open fast enough and rapid overpressure would occur in the secondary space near the nitrogen line.
  • one solution consists in placing at least one of the two valves 32 directly on the nitrogen line 30 which is identified as being the only source of overpressure.
  • the valve or valves are arranged between the valve 34 and the drainage box 20.
  • a valve 32 is mounted on the line 30 and the other is mounted on the tank crossing the double bridge 2b.
  • the two valves 32 are mounted on line 30.
  • the double upper deck 2b of the vessel of the supporting structure 2 of a Mark tank is crossed by portions of the internal and external envelopes of the tank which form domes 33a, 33b.
  • the double bridge 2b is interrupted at two locations where the tank forms a protruding structure in the form of a turret or a chimney.
  • the first turret is a liquid dome 33a which serves as a point of entry for various LNG handling equipment, namely for example a filling line, an emergency pumping line, unloading lines linked to unloading pumps, a line sprayer, a supply line linked to a spray pump, etc.
  • the second turret is a steam dome 33b which serves as a penetration point for example for a steam collecting line. The operation of this equipment is known elsewhere.
  • the tank can be equipped with a dedicated line for evacuating the inert gas contained in the secondary space (represented by an arrow in dotted lines 35).
  • This exhaust line could be connected to a degassing mast to exhaust the inert gas to the atmosphere.
  • Line 30 of this tank would then be an admission line and not a bi-directional one.
  • a similar technology can equip the tank of figures 3 to 5 .
  • the safety valves 34 are of the pilot type, that is to say they comprise a main line 36 comprising a main valve and a pilot line 38 comprising a pilot valve ( figure 8 ).
  • the main line 36 comprises an inlet and an outlet between which the main valve 36a is arranged.
  • the inlet and outlet of the main line are connected to a fluid circulation pipe such as the nitrogen line 30.
  • the pilot line 38 comprises an inlet and an outlet between which the pilot valve 38a is placed.
  • the inlet of the pilot line is connected to the aforementioned pipe and its outlet is connected to the main valve 36a.
  • the pilot valve 38a is actuated by the high pressure P1 and the back pressure P2.
  • the reference pressure P0 in the pilot valve 38a is equal to atmospheric pressure.
  • the main valve 26a is an opening valve.
  • the high pressure P1 is exerted on the underside of a cone 42.
  • the pressure P1 also passes through a piston rod 43 to an upper chamber 44 of the valve, which exerts pressure on the piston 45.
  • the piston surface is larger than that of the valve seat which, together with the action of a spring, keeps the valve closed.
  • a safety valve 32 when a safety valve 32 is mounted on line 30, its two main 36 and pilot 38 lines can be connected to line 30 ( figure 9 ) or just one of them ( figure 10 ).
  • the main line 36 is connected to the line 30 while the pilot line 38 is connected to the secondary space. This makes it possible not to undergo the effects of dynamic pressure, and to measure only a static pressure of the volume.
  • the invention therefore makes it possible to simplify the design of a tank for transporting liquefied gas by optimizing its inerting device and even the safety (valve) associated with this device.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Claims (10)

  1. Vorrichtung zur Inertisierung eines Flüssigkeitsspeichertanks für ein Transportschiff des Gases, umfassend:
    - einen Flüssigkeitsspeichertank (1) umfassend aufeinanderfolgend vom Inneren zum Äußeren des Tanks eine primäre Abdichtungsmembran (6), welche dazu geeignet ist, mit dem Flüssiggas in Kontakt zu treten, eine primäre wärmeisolierende Sperre (5), eine sekundäre Abdichtungsmembran (4), eine sekundäre wärmeisolierende Sperre (3) und eine Haltestruktur (2), welche die Form des Tanks bestimmt, wobei die primäre (6) und sekundäre (4) Abdichtungsmembran zwischen sich einen primären Isolationsbereich bestimmen, welcher die primäre wärmeisolierende Sperre enthält, wobei die primäre wärmeisolierende Sperre (5) eine Innenhülle um den Tank (1) herum bildet, und wobei die sekundäre Abdichtungsmembran (4) und die Haltestruktur (2) zwischen sich eine sekundären Isolationsbereich bestimmen, welcher die sekundäre wärmeisolierende Sperre (3) enthält, wobei die sekundäre wärmeisolierende Sperre (3) eine Außenhülle um den Tank herum bildet, wobei jeder der Bereiche dazu geeignet ist, mit einem Inertgas befüllt zu werden und wobei der Tank (1) zwischen zwei dichten Wänden (2c) und oberhalb eines Tankbodens (2a) angeordnet ist, wobei die dichten Wände und der Tankboden einen Teil der Haltestruktur bilden,
    - Mittel zur Versorgung des primären und des sekundären Bereiches mit Stickstoff und/oder Mittel zur Ableitung von Stickstoff aus diesen Bereichen,
    dadurch gekennzeichnet, dass die Vorrichtung zur Inertisierung eine Drainagebox (20) umfasst, welche unter dem Tank angeordnet ist, wobei die Box mit einem Durchlass (22), welcher sich zwischen dem Tankboden und der Außenhülle erstreckt, verbunden ist, damit Flüssigkeiten mittels Schwerkraft vom Tankboden bis zur Drainagebox fließen können,
    wobei die Drainagebox in Strömungsverbindung mit dem Durchlass und dem sekundären Bereich steht, und dadurch, dass die Mittel zur Versorgung und/oder zur Ableitung des sekundären Bereichs eine Stickstoffleitung (30) umfassen, welche mit der Drainagebox verbunden ist, damit der Stickstoff, welcher diesen Bereich versorgt und/oder aus diesem Bereich ableitbar ist, durch die Drainagebox fließt.
  2. Vorrichtung gemäß Anspruch 1, wobei die Drainagebox (20) mit einer Drainage- und Stickstoffströmungsleitung (24) verbunden ist, welche in dem Durchlass (22) des sekundären Bereichs mündet.
  3. Vorrichtung gemäß Anspruch 1 oder 2, umfassend weiterhin mindestens ein Sicherheitsventil (32), vorzugsweise gesteuert, welches unmittelbar mit der Stickstoffleitung (30) verbunden ist.
  4. Vorrichtung gemäß dem vorstehenden Anspruch, wobei mindestens ein Sicherheitsventil (32) eine Hauptleitung (36), welche ein Hauptventil (36a) umfasst, und eine Steuerleitung (38), welche ein Steuerventil (38a) umfasst, umfasst, wobei mindestens eine der Hauptleitung und der Steuerleitung unmittelbar mit der Stickstoffleitung (30) verbunden sind.
  5. Vorrichtung gemäß dem vorstehenden Anspruch, umfassend zwei gesteuerte Sicherheitsventile (32), wobei mindestens eine der Hauptleitung (36) und der Steuerleitung (38) eines jeden Ventils unmittelbar mit der Stickstoffleitung (3) verbunden sind.
  6. Vorrichtung gemäß Anspruch 4 oder 5, wobei die Hauptleitung (36) und die Steuerleitung (38) eines jeden Ventils (32) unmittelbar mit der Stickstoffleitung (30) verbunden sind.
  7. Vorrichtung gemäß einem der vorstehenden Ansprüche, umfassend weiterhin mindestens ein Sicherheitsventil (32), vorzugsweise gesteuert, welches unmittelbar mit dem sekundären Bereich verbunden ist.
  8. Vorrichtung gemäß einem der vorstehenden Ansprüche, wobei sich die Außenhülle im Endabschnitt des Tanks vollständig oberhalb der Innenhülle erstreckt.
  9. Vorrichtung gemäß einem der Ansprüche 1 bis 7, wobei die Innenhülle und die Außenhülle im oberen Endabschnitt des Tanks (1) auf einer Doppelbrücke, welche den Tank bedeckt, hervorstehen, um Wölbungen (33a, 33b) zu bilden.
  10. Schiff für den Transport von Flüssiggas, umfassend mindestens eine Vorrichtung gemäß den vorstehenden Ansprüchen.
EP18799789.5A 2017-11-16 2018-11-14 Vorrichtung zur inertisierung eines flüssiggasspeichertanks für ein schiff zum transport dieses gases Active EP3710741B1 (de)

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FR1760828A FR3073601B1 (fr) 2017-11-16 2017-11-16 Dispositif d'inertage d'une cuve de stockage de gaz liquefie pour un navire de transport de ce gaz
PCT/EP2018/081262 WO2019096861A1 (fr) 2017-11-16 2018-11-14 Dispositif d'inertage d'une cuve de stockage de gaz liquefie pour un navire de transport de ce gaz

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EP3710741A1 (de) 2020-09-23
CN111356873B (zh) 2022-06-21
RU2770334C2 (ru) 2022-04-15
SG11202004034YA (en) 2020-05-28
KR20200088525A (ko) 2020-07-23
FR3073601B1 (fr) 2019-11-22
RU2020114666A3 (de) 2022-01-11
CN111356873A (zh) 2020-06-30
RU2020114666A (ru) 2021-12-16
WO2019096861A1 (fr) 2019-05-23

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