EP3423343A1 - Procédé d'exploitation d'une cuve à gaz liquifié et cuve à gaz liquéfié destinée à recevoir du gaz naturel liquéfié et du gaz d'évaporation - Google Patents

Procédé d'exploitation d'une cuve à gaz liquifié et cuve à gaz liquéfié destinée à recevoir du gaz naturel liquéfié et du gaz d'évaporation

Info

Publication number
EP3423343A1
EP3423343A1 EP17710121.9A EP17710121A EP3423343A1 EP 3423343 A1 EP3423343 A1 EP 3423343A1 EP 17710121 A EP17710121 A EP 17710121A EP 3423343 A1 EP3423343 A1 EP 3423343A1
Authority
EP
European Patent Office
Prior art keywords
lng
bog
tank
guide
tank volume
Prior art date
Legal status (The legal status 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 status listed.)
Pending
Application number
EP17710121.9A
Other languages
German (de)
English (en)
Inventor
Jürgen Essler
Thomas Tiedemann
Andreas Hambücker
Hans-Christian HAARMANN-KÜHN
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
TGE Marine Gas Engineering GmbH
Original Assignee
TGE Marine Gas Engineering GmbH
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 TGE Marine Gas Engineering GmbH filed Critical TGE Marine Gas Engineering GmbH
Publication of EP3423343A1 publication Critical patent/EP3423343A1/fr
Pending legal-status Critical Current

Links

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
    • F17C7/00—Methods or apparatus for discharging liquefied, solidified, or compressed gases from pressure vessels, not covered by another subclass
    • F17C7/02—Discharging liquefied gases
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
    • B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING 
    • B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
    • B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
    • B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
    • B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
    • B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C3/00—Vessels not under pressure
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/0002—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the fluid to be liquefied
    • F25J1/0022—Hydrocarbons, e.g. natural gas
    • F25J1/0025—Boil-off gases "BOG" from storages
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F25—REFRIGERATION OR COOLING; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS; MANUFACTURE OR STORAGE OF ICE; LIQUEFACTION SOLIDIFICATION OF GASES
    • F25J—LIQUEFACTION, SOLIDIFICATION OR SEPARATION OF GASES OR GASEOUS OR LIQUEFIED GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT OR BY BRINGING THEM INTO THE SUPERCRITICAL STATE
    • F25J1/00—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures
    • F25J1/003—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production
    • F25J1/0032—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration"
    • F25J1/0045—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the kind of cold generation within the liquefaction unit for compensating heat leaks and liquid production using the feed stream itself or separated fractions from it, i.e. "internal refrigeration" by vaporising a liquid return stream
    • 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
    • B63B2025/087—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid comprising self-contained tanks installed in the ship structure as separate units
    • 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
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2221/00—Handled fluid, in particular type of fluid
    • F17C2221/03—Mixtures
    • F17C2221/032—Hydrocarbons
    • F17C2221/033—Methane, e.g. natural gas, CNG, LNG, GNL, GNC, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/01—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the phase
    • F17C2223/0146—Two-phase
    • F17C2223/0153—Liquefied gas, e.g. LPG, GPL
    • F17C2223/0161—Liquefied gas, e.g. LPG, GPL cryogenic, e.g. LNG, GNL, PLNG
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/03—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by the pressure level
    • F17C2223/033—Small pressure, e.g. for liquefied gas
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0135—Pumps
    • 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
    • F17C2227/0128—Propulsion of the fluid with pumps or compressors
    • F17C2227/0171—Arrangement
    • F17C2227/0178—Arrangement in the vessel
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/033—Treating the boil-off by recovery with cooling
    • F17C2265/034—Treating the boil-off by recovery with cooling with condensing the gas phase
    • 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
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/06—Fluid distribution
    • F17C2265/063—Fluid distribution for supply of refueling stations
    • 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
    • F17C2270/011—Barges
    • F17C2270/0113—Barges floating
    • 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
    • F17C2270/0165—Applications for fluid transport or storage on the road
    • F17C2270/0168—Applications for fluid transport or storage on the road by vehicles
    • 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
    • F17C2270/05—Applications for industrial use
    • F17C2270/0581—Power plants

Definitions

  • the invention relates to a method for operating a liquefied gas tank and a liquefied gas tank with a tank volume for holding liquid natural gas (LNG) and boil-off gas (BOG), and a floating storage unit (FSU), an LNG carrier, a Regas -Barge, an LNG-powered vehicle and an LNG-powered power plant, each with such a liquefied gas tank.
  • LNG liquid natural gas
  • BOG boil-off gas
  • FSU floating storage unit
  • LPG storage tanks for LNG are used, inter alia, as transport tanks in LNG carriers or as buffer storage tanks (for example FSUs or Regas barges), for example after overseas transport before being fed into a consumer network, or as storage tanks (for example in LNG-operated marine vessels). and land vehicles or in stationary gas power plants).
  • buffer storage tanks for example FSUs or Regas barges
  • storage tanks for example in LNG-operated marine vessels. and land vehicles or in stationary gas power plants).
  • the LNG contained therein despite the use of extensive heat insulation measures due to the large difference in temperature to the air of the environment of the tank is basically exposed to a slow but steady warming.
  • Solutions are also known in which the BOG is compressed, liquefied again and then returned as LNG in the tank volume of the LPG tank.
  • the solutions known for this require complex and space-consuming processing cycles for the LNG and / or the BOG to bring the latter back into the liquid phase.
  • US Pat. No. 3,733,838 discloses a system for reliquefying BOG in which liquid LNG is taken from the tank, heated by means of a heat exchanger and a heater, and converted into the gaseous phase. This gaseous LNG is then mixed with the also derived from the tank BOG, cooled in the aforementioned heat exchanger and introduced after passage of an expansion valve in the liquid phase back into the tank.
  • This process requires a heat exchanger that limits the flexibility of piping and an active heater that runs counter to the goal of minimizing heat energy and thus pressure build-up in the tank.
  • An object of the invention is now to provide a sufficient capacity for the liquefaction of BOG in a simpler manner.
  • a method for operating a liquefied gas tank having a tank volume for receiving LNG and boil-off gas (BOG) wherein a gaseous BOG stream and a liquid LNG stream are supplied to the tank volume.
  • BOG boil-off gas
  • the BOG stream is introduced into the LNG stream and then the resulting BOG-LNG mixture is introduced into the tank volume.
  • a liquefied gas tank having a tank volume for receiving LNG and boil-off gas is proposed, which is a BOG guide for guiding gaseous BOG and an LNG guide for guiding liquid LNG.
  • BOG guide and the LNG guide lead into a common BOG-LNG guide, which is designed to guide BOG-LNG mixture and flows into the tank volume.
  • an FSU In particular in order to be able to use the invention as widely as possible and / or to increase its advantages by applying the invention at several points in a liquefied gas supply chain, according to further aspects of the invention, an FSU, an LNG carrier, a Regas barge , an LNG-powered sea or land vehicle or an LNG-powered power plant, each proposed with at least one liquefied gas tank according to the invention.
  • a design according to the invention it is possible with a reduced space requirement and a minimized requirement for line and thermal management components to achieve a BOG liquefaction process that is structurally very simple to implement and that can additionally facilitate improved liquefaction performance.
  • a liquefied gas tank can be provided, which requires a smaller number of openings in the tank shell.
  • the invention is based on the idea of providing the union of the liquid LNG and the gaseous BOG as far upstream as possible in the liquefaction cycle while ensuring that the BOG is introduced into passing LNG, and not dormant LNG.
  • a heat input along superfluous pipelines can be eliminated and, on the other hand, the uptake and condensation of the gaseous BOG in the liquid LNG can be simplified.
  • the operation of a liquefied gas tank in the sense of the invention may involve both filling and emptying of its tank volume with LNG and / or BOG, as well as a storage operation, whereby over time the rising tank pressure caused by an increasing BOG fraction must be counteracted.
  • the term "operation” thus includes both a change in the filling quantity of LNG and / or BOG (and thus usually also a BOG pressure change), as well as a pressure regulation in the case of essentially constant filling quantity.
  • Boil-off gas (BOG) in the present case is to be understood as gaseous LNG, in particular that which has changed from the liquid phase into the gaseous phase due to the changing temperature or pressure environment in a tank.
  • BOG can be "produced” in the tank volume of a liquefied gas tank according to the invention or a further development, but can also come from a conventional tank from which the tank volume was filled in the sense of the invention.
  • a guide means in particular, a pipeline or an assembly of a plurality of pipelines, wherein the pipelines are preferably set up to transport LNG and / or BOG under the transport of liquid gas under normal temperature and / or pressure conditions. If appropriate, corresponding reinforcements and / or insulations may be provided for this purpose.
  • At least part of the BOG for the BOG stream and / or at least part of the LNG for the LNG stream supplied to the liquefied gas tank from outside the tank volume in particular from at least one connected storage of a floating storage unit (FSU) or an LNG carrier or a Regas barge.
  • FSU floating storage unit
  • LNG carrier or a Regas barge.
  • loading guides for BOG and / or LNG are preferably provided.
  • liquefied gas tank Various functions in the operation of the liquefied gas tank, such as the loading and the pressure regulation for the already in the liquefied gas tank BOG, can be combined with it or carried out simultaneously.
  • At least part of the BOG for the BOG stream and / or at least part of the LNG for the LNG stream from the tank volume of the Liquefied gas tanks taken even, in particular to be able to perform a pressure regulation within the tank volume also independent of a charging or discharging process.
  • circulation guides for BOG and / or LNG are preferably provided, in which the BOG and the LNG stream are combined in the sense of the invention.
  • the pressure and / or temperature conditions within the tank volume can be kept longer in a desired range.
  • LNG is pumped from a lower region of the tank volume by means of a pump into an LNG guide and / or BOG is sucked out of an upper region of the tank volume by means of a BOG guide and a compressor arranged therein.
  • the resulting streams of LNG or BOG are then preferably combined with one another in the sense of the invention.
  • the BOG flow BOG is supplied from the tank volume and from at least one connected storage and / or LNG flow from the tank volume and from at least one LNG flow connected memory supplied.
  • the loading guides (synonym filling arrangements) and / or the recirculation guides (synonymously circulating circuits) are designed to run into one another and can open into the tank volume together.
  • the LNG loading guide and the LNG circulation guide on the one hand and the BOG loading guide and the BOG circulation guide can be combined and then the combined LNG guide and the combined BOG guide are brought together in the sense of the invention.
  • the BOG-LNG mixture is introduced above a LNG filling level of the tank volume in gaseous BOG, in particular sprayed according to a preferred embodiment.
  • the entire BOG-LNG mixture guided in a common BOG-LNG guide is already present in the liquid phase and / or is still preferably undercooled with respect to the pressure conditions despite the already initiated introduction of relatively warmer BOG in the tank volume.
  • the BOG-LNG mixture is introduced according to a preferred development below an LNG filling level of the tank volume in liquid LNG. This can allow optimum mixing of the contents of the tank volume, in particular with regard to a temperature distribution.
  • the liquefied gas tank can be filled by means of a common BOG-LNG guide according to the invention and thus to save additional space and possibly line components, according to a preferred development, the BOG guide and / or the LNG guide, in particular its tank volume distal end, a fluid interface to at least one connectable memory, in particular a floating storage unit (FSU) or an LNG carrier or a Regas barge, and / or is adapted to supply the tank volume BOG or LNG from a connected memory.
  • FSU floating storage unit
  • Such a fluid interface can be designed as an LNG interface and / or as a BOG interface, depending on which type of guide it terminates. It can also be an interface standardized for handling LNG or BOG, but also an interface adapted to the connection of a specific type of storage to the liquefied gas tank.
  • the BOG guide is set up to remove gaseous BOG from the tank volume above an LNG fill level and / or the LNG guide is set below an LNG fill level remove liquid LNG from the tank volume.
  • an LNG fill level can be, for example, a predetermined fill level and / or a height range that indicates the maximum and minimum fill levels of the tank volume with liquid LNG.
  • a BOG guide for taking BOG is located above an upper limit of the altitude range (because normally BOG is always there), and an LNG guide for taking LNG below a lower limit altitude range (because there usually LNG is always located).
  • the mouth of the common BOG-LNG guide into the tank volume above one, in particular predetermined, LNG filling level of the tank volume arranged.
  • the mouth has a spray nozzle for spraying the BOG-LNG mixture, in particular in order to achieve an optimized condensation effect with respect to the BOG located above the LNG filling level.
  • the mouth of the common BOG-LNG guide is arranged in the tank volume below a, in particular predetermined, LNG filling level of the tank volume in order to achieve optimal mixing of the liquid LNG in the tank volume, in particular with regard to a uniform temperature distribution.
  • the LNG guide In order to reduce the piping necessary for integration into the consumer or consumer networks, the LNG guide according to a preferred development has an interface to a customer / consumer network, which is configured to transfer LNG from the tank volume into the customer A / to feed in the food network.
  • the BOG-guide according to a preferred embodiment, an interface to a customer A / consumer network, which is set up to feed BOG from the tank volume in the customer-A consumer network.
  • Figure 1 is a sectional view of a liquefied gas tank according to an embodiment of the invention with an external supplied BOG-LNG guide.
  • FIG. 2 shows a sectional view of a liquefied gas tank according to a further embodiment of the invention with a BOG-LNG guide supplied from the tank volume;
  • Fig. 3 is a sectional view of a liquefied gas tank according to another embodiment of the invention, in which the BOG guide and the LNG guide are completely disposed within the tank shell;
  • Fig. 4 is a sectional view of a liquefied gas tank according to another embodiment of the invention wherein the BOG-LNG mixture is compressed below the LNG fill level;
  • FIG. 5 shows a sectional view of a liquefied gas tank according to a further embodiment of the invention, to which a couplable transport tank and collector networks are connected;
  • FIG. 6 shows in a sectional view a liquefied gas tank, which differs from that according to FIG. 5, in particular in that the BOG-LNG mixture is compressed below the LNG filling level;
  • Fig. 7 in a sectional view of a liquefied gas tank, to which in addition to a dockable transport tank and customer networks and a permanently installed storage tank is connected.
  • FIG. 1 shows a liquefied gas tank 1 with a tank volume 2, in which the invention is applied to a filling arrangement 3.
  • the liquefied gas tank 1 is delimited by a tank shell 4, which is thermally insulated from the environment of the liquefied gas tank 1 by means of a heat insulating layer 6.
  • the liquefied gas tank 1 is filled up to an LNG filling level 8 with liquid LNG 10; above the LNG filling level 8, the liquefied gas tank 1 is filled with gaseous BOG 12.
  • the liquefied gas tank 1 has a BOG guide 14 for guiding gaseous BOG, via which the tank volume 2 BOG can be supplied from an external source.
  • the liquefied gas tank 1 has an LNG guide 16 for guiding liquid LNG, via which the tank volume 2 LNG can be supplied from an external source.
  • a guide compressor 18 is installed in the BOG guide 14 and a guide pump 20 in the LNG guide 16 in this embodiment.
  • a junction 22 is provided, at which a pipe element of the BOG guide 14 and a pipe element of the LNG guide 16 open into a common BOG-LNG guide 24.
  • the common BOG-LNG guide 24 is in the exemplary embodiment as a pipe formed element and extends from the junction 22 to an outlet point 26 within the tank volume 2, wherein the pipe element passes through the tank shell 4 at a breakthrough point 28.
  • a spray nozzle 30 closes off the BOG-LNG guide 24, wherein the discharge point 26 is arranged above the LNG filling level 8.
  • a discharge pump 32 for conveying liquid LNG 10 through a discharge guide 34 to an interface of an LNG consumer network 36 is provided.
  • the liquefied gas tank 1 can thus be loaded from an external source, not shown, of LNG and / or BOG, for example an LNG carrier, and independently discharged in the direction of an LNG consumer network 36 again.
  • the gaseous BOG can be condensed before entering the tank volume 2 of the liquid gas tank 1 in the already liquid LNG ,
  • the compressor 18 For the necessary pressure in this embodiment, the compressor 18; however, it would also be conceivable that the BOG from the external source is already provided with sufficiently high pressure. The supplied LNG is subcooled with respect to the prevailing conditions and can thus liquefy the impressed BOG.
  • FIG. 2 shows a liquefied gas tank 1, in which the invention is applied to a circulating circuit 38.
  • the LPG tank 1 of this embodiment has a guide pump 120 for feeding LNG into the LNG guide 116.
  • the liquefied gas tank 1 has a BOG guide 114, in which a guide compressor 118 is arranged.
  • the LNG guide 116 and the BOG guide 114 converge in the junction 22 and terminate in the common BOG LNG guide 24.
  • a BOG charging line 40 is provided, which opens above the LNG filling level within the tank volume 2, and an LNG loading line 42, which below the tank LNG filling level opens.
  • a discharge line 44 which can be connected via a standard interface with an LNG consumption network 36.
  • an LNG consumption network 36 At the separation point 46 can be connected via a suitably switchable, not shown valve, whether the LNG is directed in the direction of the junction 22 and / or in the direction of the consumer network 36.
  • the amount of gaseous BOG present 12 can be reduced by means of the circulation circuit 38 independently of loading and / or unloading operations, and thus the pressure in the tank volume 2 can be reduced.
  • gaseous BOG 12 is sucked out of the upper part of the tank volume (above the LNG filling level) and liquefied into the undercooled LNG conveyed by the pump 120 into the guide 116. This is done in the common guide 24 from the junction 22nd
  • FIG. 3 shows a liquefied gas tank 1, in which the BOG guide and the LNG guide of the circulation circuit 38 are arranged completely inside the tank shell 4.
  • This liquefied gas tank also has a filling arrangement 103 and an interface to an LNG consumer network 36 that is designed analogously to FIG.
  • an LNG guide 216 and a rudimentary BOG guide 214 are formed inside the tank envelope 4.
  • the two guides 216 and 214 both open into a Venturi nozzle 48, which is arranged above the LNG filling level 8.
  • the junction 222 is located at the entrances of the venturi 48; the orifice 26 on the common BOG-LNG guide 224 extending from the downstream end of the venturi 48.
  • the circulation circuit 38 is thus designed so that no breakthrough of the tank shell 4 is necessary and also requires only relatively short pipe elements.
  • liquid LNG 10 is conveyed by means of the pump 120 to the Venturi nozzle 48, which can entrain in the nozzle 48 gaseous BOG 12, which is under the pressure of the tank volume 2.
  • a very short BOG guide 214 is shown in the illustration of FIG. 3, but it could also be omitted as long as the venturi 48 has a suitable inlet.
  • FIG. 4 shows a liquid gas tank 1, in which substantially the filling arrangement 3 from FIG. 1 and the circulation circuit 38 from FIG. 2 are combined with one another, so that in the embodiment described here an integrated line arrangement with a circulation circuit 338 and a filling arrangement 303 is formed.
  • FIG. 5 shows a liquefied gas tank 1, to which a dockable transport tank 50 (for example an LNG carrier) and customer networks (LNG customer network 36 and BOG customer network 52) are connected or connectable.
  • a dockable transport tank 50 for example an LNG carrier
  • customer networks LNG customer network 36 and BOG customer network 52
  • the embodiment of the liquefied gas tank 1 shown in FIG. 5 is essentially the same as in FIG. 4, except that the connected "external source” communicates with the transport tank 50 (with its BOG connecting line 51 (functionally corresponds at least partially to the transport tank 1) 1) and its LNG connection line 53 (corresponds functionally at least partially to the LNG guide 16 in FIG. 1) .
  • the BOG connection line 51 is connected to the BOG guide 114 by means of a BOG fluid interface 15
  • the LNG connection line 53 is connected by means of an LNG fluid interface 17 to the LNG guide 16 according to FIG.
  • the embodiment according to FIG. 5 differs from that according to FIG. 4 in the possibility of feeding BOG (both from the tank volume 2 and from the transport tank 50) into a BOG consumer network 52 via a valve (not shown) and a discharge line 58.
  • BOG both from the tank volume 2 and from the transport tank 50
  • a valve not shown
  • a discharge line 58 Unlike in FIG. 4, the BOG-LNG mixture is sprayed in above the LNG fill level 8.
  • FIG. 6 differs from that according to FIG. 5 only in that the BOG-LNG mixture is pressed in below the LNG filling level 8, as in FIG.
  • a liquefied gas tank 1 is shown, on which in addition to a dockable transport tank 50 and customer networks 36 and 52, a fixed storage tank 60 is connected.
  • the storage tank 60 has essentially only interfaces with the liquefied gas tank 1 with respect to BOG and with respect to LNG.
  • an LNG pump 54 for supplying LNG from the liquid gas tank 1 to the storage tank 60 and an LNG pump 56 for supplying LNG from the storage tank 60 to the liquid gas tank 1 are provided below the LNG filling level.
  • the storage tank 60 is thus, as it were, downstream of the liquefied gas tank 1 as volume and / or refrigeration capacity extension.
  • the storage tank 60 can be used, for example, as a storage for highly supercooled LNG by being filled with it when it is just in bulk - for example, by an incoming ship's cargo. If then in a later If, for example, a large amount of relatively warm BOG has to be taken over from another transport tank 50 of an LNG carrier, this can be recondensed in the liquefied gas tank 1 for a long time because cold LNG can be fed from the storage tank 60.
  • the storage tank 60 can serve for longer term stabilization of the LNG supercooling in liquefied gas tank 1 by pumping warmer LNG from liquefied gas tank 1 into storage tank 60 and mixing it with the relatively cold LNG and later or at the same time colder LNG is pumped from the storage tank into the liquefied gas tank 1.
  • FIGS. 5, 6 and 7 illustrate the typical case of a Regas barge (which here houses the liquefied gas tank 1 in the sense of the invention) serving as a buffer for BOG 12 and / or LNG 10 after delivery by an LNG carrier (here with transport tank 50) and before feeding into consumer networks 36 and / or 52 serves.
  • a liquefied gas tank 1 according to the invention By using a liquefied gas tank 1 according to the invention, the duration of the externally unaffected between storage in the Regas barge can be significantly extended with a very simple design.

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • General Engineering & Computer Science (AREA)
  • Chemical & Material Sciences (AREA)
  • Combustion & Propulsion (AREA)
  • Ocean & Marine Engineering (AREA)
  • Physics & Mathematics (AREA)
  • Thermal Sciences (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • General Chemical & Material Sciences (AREA)
  • Oil, Petroleum & Natural Gas (AREA)
  • Filling Or Discharging Of Gas Storage Vessels (AREA)

Abstract

La présente invention concerne un procédé d'exploitation d'une cuve à gaz liquéfié (1) présentant une cavité (2) destinée à recevoir du gaz naturel liquéfié (GNL) et du gaz d'évaporation, un flux de gaz d'évaporation et un flux de GNL étant introduits dans la cavité. Selon l'invention, le flux de gaz d'évaporation est introduit dans le flux de GNL, et le mélange gaz d'évaporation-GNL qui en résulte est ensuite introduit dans la cavité. La présente invention concerne également une cuve à gaz liquéfié correspondante.
EP17710121.9A 2016-02-29 2017-02-14 Procédé d'exploitation d'une cuve à gaz liquifié et cuve à gaz liquéfié destinée à recevoir du gaz naturel liquéfié et du gaz d'évaporation Pending EP3423343A1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102016002316.3A DE102016002316A1 (de) 2016-02-29 2016-02-29 Verfahren zum Betrieb eines Flüssiggastanks und Flüssiggastank zur Aufnahme von LNG und Boil-off-Gas
PCT/EP2017/000205 WO2017148571A1 (fr) 2016-02-29 2017-02-14 Procédé d'exploitation d'une cuve à gaz liquifié et cuve à gaz liquéfié destinée à recevoir du gaz naturel liquéfié et du gaz d'évaporation

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EP3423343A1 true EP3423343A1 (fr) 2019-01-09

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US (1) US20190056063A1 (fr)
EP (1) EP3423343A1 (fr)
JP (1) JP6994464B2 (fr)
KR (1) KR102177084B1 (fr)
CN (1) CN108778921A (fr)
DE (1) DE102016002316A1 (fr)
SG (1) SG11201807395WA (fr)
WO (1) WO2017148571A1 (fr)

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JP6574321B1 (ja) * 2019-02-15 2019-09-11 石油資源開発株式会社 浮体式低温液化ガス充填設備及びこれを用いた低温液化ガス配送方法
CN110642217A (zh) * 2019-07-01 2020-01-03 Amg能源新加坡私人有限公司 Lng运输和配送的系统和方法
KR102235684B1 (ko) * 2019-09-05 2021-04-02 (유)성문 Lng 연료탱크의 감압장치 및 감압방법
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JP2022071534A (ja) * 2020-10-28 2022-05-16 三菱造船株式会社 浮体、液化二酸化炭素の積込方法、液化二酸化炭素の揚荷方法
JP7050987B1 (ja) * 2020-10-30 2022-04-08 三菱造船株式会社 浮体
CN113639192B (zh) * 2021-10-14 2021-12-21 厚普清洁能源股份有限公司 一种利用bog实现lng在线调饱和的系统及控制方法

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JP2019512072A (ja) 2019-05-09
US20190056063A1 (en) 2019-02-21
DE102016002316A1 (de) 2017-08-31
WO2017148571A1 (fr) 2017-09-08
JP6994464B2 (ja) 2022-01-14
KR20180115313A (ko) 2018-10-22
SG11201807395WA (en) 2018-09-27
CN108778921A (zh) 2018-11-09
KR102177084B1 (ko) 2020-11-11

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