EP2775194B1 - Druckaufbau-unterdrückungsvorrichtung für einen speichertank, druckaufbau-unterdrückungssystem damit, unterdrückungsverfahren dafür, flüssiggastransportgefäss damit und flüssiggas-lagerungsanlage damit - Google Patents

Druckaufbau-unterdrückungsvorrichtung für einen speichertank, druckaufbau-unterdrückungssystem damit, unterdrückungsverfahren dafür, flüssiggastransportgefäss damit und flüssiggas-lagerungsanlage damit Download PDF

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Publication number
EP2775194B1
EP2775194B1 EP12841914.0A EP12841914A EP2775194B1 EP 2775194 B1 EP2775194 B1 EP 2775194B1 EP 12841914 A EP12841914 A EP 12841914A EP 2775194 B1 EP2775194 B1 EP 2775194B1
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Prior art keywords
liquid
gas
phase
pressure
liquefied gas
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EP12841914.0A
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English (en)
French (fr)
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EP2775194A1 (de
EP2775194A4 (de
Inventor
Masaru Oka
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Mitsubishi Shipbuilding Co Ltd
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Mitsubishi Shipbuilding Co Ltd
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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
    • 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
    • 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
    • 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
    • F25J1/0047—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 an "external" refrigerant stream in a closed vapor compression cycle
    • F25J1/005—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 an "external" refrigerant stream in a closed vapor compression cycle by expansion of a gaseous refrigerant stream with extraction of work
    • 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
    • F25J1/006—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures characterised by the refrigerant fluid used
    • F25J1/007—Primary atmospheric gases, mixtures thereof
    • F25J1/0072—Nitrogen
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0203—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle
    • F25J1/0204—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process using a single-component refrigerant [SCR] fluid in a closed vapor compression cycle as a single flow SCR cycle
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0257—Construction and layout of liquefaction equipments, e.g. valves, machines
    • F25J1/0275—Construction and layout of liquefaction equipments, e.g. valves, machines adapted for special use of the liquefaction unit, e.g. portable or transportable devices
    • F25J1/0277—Offshore use, e.g. during shipping
    • 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
    • F25J1/02—Processes or apparatus for liquefying or solidifying gases or gaseous mixtures requiring the use of refrigeration, e.g. of helium or hydrogen ; Details and kind of the refrigeration system used; Integration with other units or processes; Controlling aspects of the process
    • F25J1/0243—Start-up or control of the process; Details of the apparatus used; Details of the refrigerant compression system used
    • F25J1/0279—Compression of refrigerant or internal recycle fluid, e.g. kind of compressor, accumulator, suction drum etc.
    • F25J1/0285—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings
    • F25J1/0288—Combination of different types of drivers mechanically coupled to the same refrigerant compressor, possibly split on multiple compressor casings using work extraction by mechanical coupling of compression and expansion of the refrigerant, so-called companders
    • 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
    • F17C2223/01—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
    • F17C2223/0169—Liquefied gas, e.g. LPG, GPL subcooled
    • 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
    • F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
    • F17C2223/04—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel characterised by other properties of handled fluid before transfer
    • F17C2223/042—Localisation of the removal point
    • F17C2223/046—Localisation of the removal point in the liquid
    • F17C2223/047—Localisation of the removal point in the liquid with a dip tube
    • 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
    • F17C2225/00—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel
    • F17C2225/04—Handled fluid after transfer, i.e. state of fluid after transfer from the vessel characterised by other properties of handled fluid after transfer
    • F17C2225/042—Localisation of the filling point
    • F17C2225/043—Localisation of the filling point in the gas
    • F17C2225/044—Localisation of the filling point in the gas at several points, e.g. with a device for recondensing 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
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0341—Heat exchange with the fluid by cooling using another 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
    • F17C2227/00—Transfer of fluids, i.e. method or means for transferring the fluid; Heat exchange with the fluid
    • F17C2227/03—Heat exchange with the fluid
    • F17C2227/0337—Heat exchange with the fluid by cooling
    • F17C2227/0365—Heat exchange with the fluid by cooling with recovery of heat
    • 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
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/01—Intermediate tanks
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2250/00—Accessories; Control means; Indicating, measuring or monitoring of parameters
    • F17C2250/04—Indicating or measuring of parameters as input values
    • F17C2250/0404—Parameters indicated or measured
    • F17C2250/0439—Temperature
    • F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
    • F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
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    • F17C2260/00—Purposes of gas storage and gas handling
    • F17C2260/02—Improving properties related to fluid or fluid transfer
    • F17C2260/021—Avoiding over pressurising
    • 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
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • F17C2265/00—Effects achieved by gas storage or gas handling
    • F17C2265/03—Treating the boil-off
    • F17C2265/032—Treating the boil-off by recovery
    • F17C2265/037—Treating the boil-off by recovery with pressurising
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    • F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
    • 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
    • F17C2270/05—Applications for industrial use
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B1/00—Compression machines, plants or systems with non-reversible cycle
    • F25B1/10—Compression machines, plants or systems with non-reversible cycle with multi-stage compression
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B2400/00—General features or devices for refrigeration machines, plants or systems, combined heating and refrigeration systems or heat-pump systems, i.e. not limited to a particular subgroup of F25B
    • F25B2400/14—Power generation using energy from the expansion of the refrigerant
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/002—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point characterised by the refrigerant
    • 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
    • F25B—REFRIGERATION MACHINES, PLANTS OR SYSTEMS; COMBINED HEATING AND REFRIGERATION SYSTEMS; HEAT PUMP SYSTEMS
    • F25B9/00—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point
    • F25B9/06—Compression machines, plants or systems, in which the refrigerant is air or other gas of low boiling point using expanders
    • 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
    • F25J2205/00—Processes or apparatus using other separation and/or other processing means
    • F25J2205/90—Mixing of components
    • 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
    • F25J2210/00—Processes characterised by the type or other details of the feed stream
    • F25J2210/04—Mixing or blending of fluids with the feed stream
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/62—Ethane or ethylene
    • 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
    • F25J2215/00—Processes characterised by the type or other details of the product stream
    • F25J2215/64—Propane or propylene
    • 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
    • F25J2245/00—Processes or apparatus involving steps for recycling of process streams
    • F25J2245/90—Processes or apparatus involving steps for recycling of process streams the recycled stream being boil-off gas from storage
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/34—Details about subcooling of liquids
    • 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
    • F25J2290/00—Other details not covered by groups F25J2200/00 - F25J2280/00
    • F25J2290/62—Details of storing a fluid in a tank

Definitions

  • the present invention relates to a storage-tank pressure-rise suppressing apparatus, a pressure-rise suppressing system including the same, a suppressing method for the same, a liquefied-gas cargo ship including the same, and liquefied-gas storage equipment including the same.
  • the present invention relates to suppression of a pressure rise in a storage tank storing liquefied gas.
  • a storage tank (hereinafter referred to as a “cargo tank”) storing liquefied gas such as liquefied natural gas (hereinafter referred to as “LNG”) or liquefied petroleum gas (hereinafter referred to as “LPG”) in the liquid phase
  • LNG liquefied natural gas
  • LPG liquefied petroleum gas
  • the vaporized gas is reliquefied, or the boil-off gas is extracted from the cargo tank and is combusted or disposed of outside.
  • boil-off gas in a cargo tank 102 is compressed to high pressure by a boil-off-gas compressor 103, and the compressed boil-off gas is cooled in a condenser 104 by exchanging heat with seawater (design temperature: about 32 °C) supplied from outside the ship, whereby the boil-off gas is condensed at about 40 °C.
  • seawater design temperature: about 32 °C
  • the LPG condensed in this manner is fed to the cargo tank 102, and a portion of the LPG gasifies when the LPG is subjected to pressure reduction (expansion) in the cargo tank 102.
  • the temperature of the liquid-phase LPG stored in the cargo tank 102 is lowered by using the cooling due to the evaporation of the LPG, so that the total amount of boil-off gas (the total amount of the gas phase) in the cargo tank 102 is reduced, thereby suppressing the pressure in the cargo tank 102.
  • Fig. 8 shows a process diagram in the case where, for example, propane is reliquefied by using the reliquefaction apparatus 101 shown in Fig. 7 .
  • the vertical axis represents pressure (MPa)
  • the horizontal axis represents specific enthalpy (kJ/kg).
  • I indicates evaporation of the liquid-phase LPG stored in the cargo tank 102 shown in Fig. 7 , becoming boil-off gas
  • II indicates compression of the boil-off gas by the boil-off-gas compressor 103
  • III indicates cooling of the boil-off gas with seawater in the condenser 104
  • IV indicates expansion of the condensed LPG in the cargo tank 102, thus cooling the liquid-phase LPG stored in the cargo tank 102 by means of gas.
  • a reciprocal multi-stage boil-off-gas compressor 103 in which a piston 107 is provided inside a cylinder 105 and that includes a driving unit 111 that drives the piston 107 via a crankshaft 109 is used to compress boil-off gas to high pressure of about 16 to 20 atmospheres before it is fed to the condenser 104.
  • a plate or shell-and-tube heat exchanger of a cooling system that utilizes seawater is used in the condenser 104.
  • an indirect cooling system that uses nitrogen as a refrigerant and that is based on the Brayton cycle is adopted. More specifically, in the reliquefaction apparatus 201, boil-off gas generated in a cargo tank 202 is passed through a boil-off-gas feeding pipe 209, is subjected to pressurization by a boil-off-gas compressor 203 via a boil-off-gas thermal relaxation and separator 207, and is fed to a cold box 204 employing the indirect cooling system. Then, the boil-off gas exchanges heat with nitrogen serving as refrigerant in the cold box 204 employing the indirect cooling system.
  • the boil-off gas is condensed and supercooled to enter the liquid phase.
  • the liquid-phase condensed (reliquefied) LNG is passed through a reliquefied-gas pipe 205 and is again fed into the cargo tank 202.
  • a pressure rise in the cargo tank 202 is suppressed by reliquefying boil-off gas as described above.
  • a reliquefied-LNG feeding pipe 211 for extracting and feeding a portion of the LNG reliquefied in the cold box 204 is connected to the boil-off-gas thermal relaxation and separator 207.
  • boil-off gas is cooled (thermally relaxed) by the reliquefied LNG fed from the reliquefied-LNG feeding pipe 211, and gas and liquid are separated from each other.
  • Fig. 10 shows a process diagram in the case where LNG is reliquefied by using the reliquefaction apparatus 201 shown in Fig. 9 , in which the vertical axis represents pressure (MPa) and the horizontal axis represents specific enthalpy (kJ/kg).
  • FIG. 10 similarly to Fig. 8 , I indicates that LNG evaporates and becomes boil-off gas in the cargo tank 202 shown in Fig. 9 , II indicates compression of the boil-off gas by the boil-off-gas compressor 203, III indicates cooling of the boil-off gas with nitrogen in the cold box 204, and IV indicates that the pressure in the cargo tank 202 is reduced.
  • Nitrogen is used as the refrigerant fed to the cold box 204 of the reliquefaction apparatus 201 shown in Fig. 9 .
  • the nitrogen is compressed to high pressure through three stages constituted of a two-stage nitrogen compressor 231 and a nitrogen booster 232. More specifically, the nitrogen whose pressure has been made high by the nitrogen compressor 231 is fed to the cold box 204 and exchanges heat with low-pressure, low-temperature nitrogen gas obtained by cooling and condensing the boil-off gas, whereby the temperature of the high-pressure nitrogen is lowered.
  • the high-pressure nitrogen at the lowered temperature is fed to a nitrogen expander 233 that is provided coaxially with the nitrogen booster 232.
  • the high-pressure nitrogen fed to the nitrogen expander 233 is subjected to pressure reduction, whereby it becomes low-temperature, low-pressure nitrogen gas.
  • the low-temperature, low-pressure nitrogen gas is again fed to the cold box 204, exchanges heat with the boil-off gas and the high-pressure nitrogen mentioned earlier, in that order, and is fed out from the cold box 204.
  • the nitrogen fed out from the cold box 204 is fed to the nitrogen booster 232, is compressed by the nitrogen booster 232, and is fed to the inlet of the nitrogen compressor 231.
  • a second heat exchanger 237 is provided between the nitrogen booster 232 and the nitrogen compressor 231 to remove the heat of compression of the nitrogen that has been boosted by the nitrogen booster 232.
  • WO 98/43029A1 discloses a method and device for storage and transport of liquefied natural gas.
  • the device has a storage tank for the liquefied natural gas, a pipeline for extracting gas-phase liquefied gas from above a liquid level in the tank, a compressor for compressing the extracted gas phase liquefied gas, a heat exchanger for exchanging heat of the compressed gas phase liquefied gas with a coolant circulating through a coolant plant, and a liquid-gas separator downstream of the heat exchanger for separating the liquid phase gas and circulating it back to the storage tank while blowing off the separated gas phase to the atmosphere.
  • a bypass line is provided to return liquid phase gas to the inlet side of the heat exchanger.
  • a temperature sensor is provided to measure the temperature of the extracted compressed gas-phase liquefied gas at the inlet of the heat exchanger and is connected to a valve in the bypass line.
  • the device/method aims at reducing a temperature differential of the gas-phase liquefied gas at the inlet of the heat exchanger by mixing it with liquid-phase liquefied gas returned trough the bypass line in order to allow the heat exchanger to be simple.
  • JP 2009-58199A discloses that coolant stored in a coolant tank is cooled by exchanging heat with a refrigerant in a heat exchanger and that laser machining equipment is cooled with the coolant that has been cooled while being fed back to the coolant tank, this is temperature control of coolant for cooling laser machining equipment, and a method of suppressing a pressure rise in a cargo tank storing liquefied gas is not disclosed.
  • the present invention has been made in view of the situation described above, and it is an object thereof to provide a storage-tank pressure-rise suppressing apparatus with which it is possible to suppress a pressure rise in a storage tank storing liquefied gas and with which it is possible to simplify equipment and to reduce equipment costs, as well as a pressure-rise suppressing system for the same, a suppressing method for the same, a liquefied-gas cargo ship including the same, and liquefied-gas storage equipment including the same.
  • a storage-tank pressure-rise suppressing apparatus includes the features of claim 1.
  • the apparatus thus has a storage tank for storing liquefied gas; a heat exchange means for exchanging heat between the liquid-phase liquefied gas extracted from the storage tank and a refrigerant; a refrigerant compression means for compressing the refrigerant that is to be fed to the heat exchange means; a refrigerant expansion means for reducing the pressure of the refrigerant that has been compressed by the refrigerant compression means and feeding the refrigerant to the heat exchange means; and a feeding means for feeding the liquid-phase liquefied gas that has been cooled in the heat exchange means to the liquid-phase liquefied gas in the storage tank.
  • the liquid-phase liquefied gas extracted from the storage tank is cooled by exchanging heat with the refrigerant in the heat exchange means, and the cooled liquid-phase liquefied gas is fed back to the liquid-phase liquefied gas in the storage tank via the feeding means.
  • liquefied gas liquefied natural gas (LNG), liquefied petroleum gas (LPG), ethane, ethylene, ammonia, a mixture thereof, etc.
  • LNG liquefied natural gas
  • LPG liquefied petroleum gas
  • ethane ethylene
  • ammonia a mixture thereof, etc.
  • a storage-tank pressure-rise suppressing apparatus includes a spraying means for spraying the liquid-phase liquefied gas that has been cooled in the heat exchange means into the gas-phase liquefied gas in the storage tank.
  • the liquid-phase liquefied gas extracted from the storage tank is cooled by exchanging heat with the refrigerant in the heat exchange means, and the cooled liquid-phase liquefied gas is sprayed into the gas-phase liquefied gas in the storage tank by the spraying means.
  • the cooled liquid-phase liquefied gas is sprayed into the gas-phase liquefied gas in the storage tank by the spraying means.
  • the liquefied gas having an increased droplet diameter drops on the surface of the liquid-phase liquefied gas (liquid surface) stored in the storage tank.
  • the liquefied gas having an increased droplet diameter drops on the surface of the liquid-phase liquefied gas (liquid surface) stored in the storage tank.
  • the feeding means may include a feeding-flow-rate adjusting means for adjusting the feeding flow rate of the liquid-phase liquefied gas that has been cooled in the heat exchange means.
  • the feeding means With the feeding-flow-rate adjusting means for adjusting the flow rate for feeding the liquid-phase liquefied gas cooled in the heat exchange means to the liquid-phase liquefied gas in the storage tank, it becomes possible to adjust the flow rate to a flow rate corresponding to heat that has entered the storage tank from the outside when the liquid-phase liquefied gas cooled by the heat exchange means is fed to the storage tank.
  • the overall temperature of the liquid-phase liquefied gas in the storage tank increases due to incoming heat, it is possible to suppress a pressure rise in the storage tank.
  • the spraying means may include a spraying-amount adjusting means for adjusting the spraying amount of the liquid-phase liquefied gas that has been cooled in the heat exchange means.
  • the spraying means With the spraying-amount adjusting means for adjusting the spraying amount for feeding the liquid-phase liquefied gas cooled in the heat exchange means to the gas-phase liquefied gas in the storage tank, it becomes possible to adjust the flow rate of the cooled liquid-phase liquefied gas that is sprayed into the gas-phase liquefied gas in the storage tank, thereby adjusting the rate of condensation (reliquefaction) of the gas-phase liquefied gas in the storage tank. Accordingly, it is possible to adjust the pressure due to the gas-phase liquefied gas in the storage tank, making the pressure in the storage tank less than or equal to a predetermined pressure.
  • the storage-tank pressure-rise suppressing apparatus includes a bypassing means for making a portion of the liquid-phase liquefied gas that is fed to the heat exchange means bypass the heat exchange means and for feeding the portion to the feeding means and/or the spraying means; and a bypass-flow-rate adjusting means for adjusting the bypass flow rate of the liquid-phase liquefied gas that is passed through the bypassing means.
  • bypassing means for making a portion of the liquid-phase liquefied gas extracted from the storage tank bypass the heat exchange means and for feeding the portion to the feeding means and/or the spraying means
  • bypassing means with the bypass-flow-rate adjusting means for adjusting the flow rate of the liquid-phase liquefied gas that is passed through the bypassing means
  • it is possible to suppress a pressure rise in the storage tank by adjusting the rate of cooling of the liquid-phase liquefied gas stored in the storage tank and/or the rate of condensation (reliquefaction) of the gas-phase liquefied gas.
  • the storage tank may include a reserve tank and an intermediate tank that is provided between the reserve tank and the heat exchange means and that temporarily stores the liquid-phase liquefied gas and/or gas-phase liquefied gas extracted from the reserve tank, the feeding means and/or the spraying means may be provided at the intermediate tank, and the liquid-phase liquefied gas that has been cooled in the heat exchange means may be fed to the intermediate tank.
  • a pressure-rise suppressing system includes the above-described storage-tank pressure-rise suppressing apparatus according to the present invention, wherein multiple storage tanks are provided as the storage tank and wherein the liquefied gas stored in the individual storage tanks are of gas kinds that vary among the storage tanks.
  • the pressure-rise suppressing apparatus in which only the liquid phase (single phase) of the circulated liquefied gas is subjected to heat exchange in the heat exchange means, it suffices to impart, by means of the refrigerant compression means, a pressure difference corresponding to a temperature difference that is imparted by the refrigerant in the heat exchange means.
  • a single pressure-rise suppressing apparatus it is possible with a single pressure-rise suppressing apparatus to cool the variety of kinds of liquefied gas stored in the individual storage tanks. Accordingly, it is possible to simplify the pressure-rise suppressing system and to reduce equipment costs.
  • a liquefied-gas cargo ship according to the present invention includes the above-described pressure-rise suppressing system according to the present invention.
  • Liquefied-gas storage equipment includes the above-described pressure-rise suppressing system according to the present invention.
  • the pressure-rise suppressing system that can cool a variety of kinds of liquefied gas stored in the individual storage tanks by means of a single pressure-rise suppressing apparatus is used. Accordingly, it becomes possible to simplify a pressure-rise suppressing system that is installed on a liquefied-gas storage equipment and to reduce equipment costs.
  • liquid-phase liquefied gas extracted from a storage tank storing the liquefied gas is cooled by exchanging heat between the liquid-phase liquefied gas and a refrigerant that has been compressed and whose pressure has then been reduced, and the liquid-phase liquefied gas that has been cooled by exchanging heat is fed to the liquid-phase liquefied gas and/or gas-phase liquefied gas stored in the storage tank.
  • a liquefied-natural-gas cargo ship equipped with a storage-tank pressure-rise suppressing system according to a first embodiment of the present invention will be described based on Figs. 1 and 2 .
  • Fig. 1 is a schematic configuration diagram of a cargo-tank pressure-rise suppressing apparatus constituting the pressure-rise suppressing system installed in the liquefied-natural-gas cargo ship according to this embodiment.
  • Fig. 2 shows a schematic process diagram of pressure and specific enthalpy due to the pressure-rise suppressing apparatus shown in Fig. 1 , in which the vertical axis represents pressure (MPa) and the horizontal axis represents enthalpy (kJ/kg).
  • a pressure-rise suppressing apparatus 1 is installed, which is equipped with a cargo tank (storage tank) 2 that stores liquefied natural gas (liquefied gas), a cold box (heat exchange means) 4 in which liquid-phase liquefied natural gas extracted from the cargo tank 2 (hereinafter referred to as "recirculated LNG") exchanges heat with nitrogen (refrigerant), a nitrogen compressor (refrigerant compression means) 31 and a nitrogen booster (refrigerant compression means) 32 that compress nitrogen that is fed to the cold box 4, a nitrogen expander (refrigerant expansion means) 33 that reduces the pressure of the nitrogen compressed by the nitrogen compressor 31 and the nitrogen booster 32 and supplies the resulting nitrogen to the cold box 4, a pipe (feeding means) 11 for feeding the liquid-phase recirculated LNG cooled in the cold box 4 to the liquid-phase liquefied natural gas (
  • the pressure-rise suppressing apparatus 1 includes an LNG recirculating system 10 that cools a portion of the liquid-phase LNG stored as cargo in the cargo tank 2 and recirculates the LNG to the boil-off gas stored in the upper space in the cargo tank 2 and the liquid-phase LNG stored in the lower part of the cargo tank 2, and also includes a nitrogen refrigerant cycle 30 for circulating nitrogen that has been subjected to heat exchange with the recirculated LNG, i.e., the liquid-phase LNG extracted from the cargo tank 2.
  • an LNG recirculating system 10 that cools a portion of the liquid-phase LNG stored as cargo in the cargo tank 2 and recirculates the LNG to the boil-off gas stored in the upper space in the cargo tank 2 and the liquid-phase LNG stored in the lower part of the cargo tank 2, and also includes a nitrogen refrigerant cycle 30 for circulating nitrogen that has been subjected to heat exchange with the recirculated LNG, i.e., the liquid-phase LNG extracted from the cargo tank 2.
  • the LNG recirculating system 10 includes an LNG circulating pump 12 for extracting a portion of the liquid-phase LNG stored in the cargo tank 2; the cold box 4, in which the recirculated LNG extracted by the LNG circulating pump 12 exchanges heat with nitrogen, whereby the liquid-phase recirculated LNG is cooled; the pipe 11 for feeding the recirculated LNG cooled in the cold box 4 to the vicinity of the bottom of the cargo tank 2; a bypassing pipe (bypassing means) for making a portion of the recirculated LNG that is fed to the cold box 4 bypass the cold box 4 and merge with the pipe 11; a pipe 14 that branches from the pipe 11 on the downstream side of the point at which the bypassing pipe 13 merges with the pipe 11 and through which a portion of the cooled liquid-phase recirculated LNG is fed to the upper space in the cargo tank 2; and the boil-off-gas spraying nozzle 18, which is provided at the end of the pipe 14 and which sprays the cooled liquid-phase recirculated LNG into the boil-
  • a bypass-flow control valve (bypass-flow-rate adjusting means) 15 for adjusting the bypass flow rate of the recirculated LNG fed to the bypassing pipe 13 is provided on the bypassing pipe 13 of the LNG recirculating system 10, and a spraying control valve (spraying-amount adjusting means) 16 for adjusting the spraying amount of the liquid-phase recirculated LNG cooled in the cold box 4 is provided on the pipe 14, and a recirculation control valve (feeding-flow-rate adjusting means) 17 for adjusting the recirculating amount (feeding flow rate) of the liquid-phase recirculated LNG cooled in the cold box 4 is provided on the pipe 11 on the downstream side of the point at which the pipe 14 merges with the pipe 11.
  • a temperature measurement means 19 for measuring the temperature of the liquid-phase recirculated LNG passing through the pipe 11 is provided.
  • the cargo tank 2 stores liquid LNG as cargo. Although the cargo tank 2 has a heat-insulating structure, due to heat entering the cargo tank 2 from the outside, the liquid LNG stored in the cargo tank 2 is warmed, and a portion of the liquid LNG evaporates. The evaporated LNG is stored as boil-off gas in the upper space above the liquid surface of the liquid-phase LNG stored in the cargo tank 2.
  • a loading pump that is immersed in the stored liquid-phase LNG and that is used to load the liquid-phase LNG is provided.
  • the LNG circulating pump 12 used to circulate the recirculated LNG in the LNG recirculating system 10 also works as this loading pump in the case of this embodiment, there is no limitation to this embodiment.
  • a vent pipe 21 that allows removing the boil-off gas stored in the upper space in the cargo tank 2 from the inside to the outside of the cargo tank 2 is connected to the top of the cargo tank 2.
  • the cold box 4 is a heat exchanger of an indirect cooling system that cools the liquid-phase recirculated LNG by way of heat exchange between the nitrogen fed from the nitrogen refrigerant cycle 30 and the liquid-phase recirculated LNG fed from the LNG recirculating system 10.
  • the cold box 4 includes a precooling unit C1 and a cooling unit C2.
  • heat is exchanged between low-pressure, low-temperature nitrogen gas fed from the nitrogen refrigerant cycle 30, which will be described later, and high-pressure nitrogen compressed by the nitrogen compressor 31.
  • heat is exchanged between low-temperature, low-pressure nitrogen gas and the liquid-phase recirculated LNG fed from the LNG recirculating system 10.
  • the nitrogen refrigerant cycle 30 feeds nitrogen, which serves as refrigerant, to the cold box 4.
  • the nitrogen refrigerant cycle 30 includes the cold box 4 described above, in which the liquid-phase recirculated LNG fed from the LNG recirculating system 10 exchanges heat with nitrogen; the nitrogen expander 33, which reduces the pressure of the nitrogen whose pressure has been made high by the nitrogen compressor 31 and the nitrogen booster 32, a first heat exchanger 34 that cools the high-pressure nitrogen compressed by the nitrogen compressor 31, and a second heat exchanger 35 that cools the nitrogen compressed by the nitrogen booster 32.
  • the nitrogen compressor 31 is a single-stage compressor, and it sucks and compresses nitrogen, which serves as refrigerant, to make it high-temperature, high-pressure nitrogen.
  • the nitrogen booster 32 compresses the nitrogen that has exchanged heat in the cold box 4 with the liquid-phase recirculated LNG fed from the LNG recirculating system 10.
  • the nitrogen booster 32 has a rotation shaft 36, and the nitrogen expander 33 is provided coaxially with the rotation shaft 36.
  • the nitrogen expander 33 reduces the pressure of and thereby expands the high-pressure nitrogen whose temperature has been reduced while passing through the cold box 4 from the nitrogen compressor 31, thereby making it low-temperature, low-pressure nitrogen gas.
  • the rotation shaft 36 is driven by using the expanding force of the compressed nitrogen as a rotating force, whereby the nitrogen booster 32 is driven to rotate.
  • the first heat exchanger 34 by using clean water, etc. serving as refrigerant, cools and lowers the temperature of the nitrogen whose pressure has been made high by the nitrogen compressor 31.
  • the second heat exchanger 35 by using clean water, etc. serving as refrigerant, cools and lowers the temperature of the nitrogen that has been compressed by the nitrogen booster 32.
  • the refrigerant used in the first heat exchanger 34 and the second heat exchanger 35 may be seawater.
  • Fig. 2 shows a schematic process diagram of pressure and specific enthalpy due to the pressure-rise suppressing apparatus 1 shown in Fig. 1 .
  • the liquid-phase LNG stored in the cargo tank 2 is fed out to a pipe 20 by the LNG circulating pump 12 (I in Fig. 2 ).
  • the liquid-phase recirculated LNG fed out to the pipe 20 is fed from the pipe 20 to the cold box 4 (II in Fig. 2 ).
  • the liquid-phase recirculated LNG fed to the cold box 4 exchanges heat with the low-temperature, low-pressure nitrogen gas fed from a pipe 37 of the nitrogen refrigerant cycle 30 to the cold box 4, whereby the recirculated LNG is cooled (III in Fig. 2 ).
  • liquid-phase recirculated LNG when the liquid-phase recirculated LNG exchanges heat with the nitrogen gas in the cooling unit C2 of the cold box 4, the liquid-phase recirculated LNG is directly cooled in a single phase without undergoing a condensation process, as opposed to the case where gas-phase LNG, i.e., boil-off gas, is condensed and supercooled in a cold box 204 provided in a conventional LNG reliquefaction apparatus 201 shown in Fig. 9 .
  • gas-phase LNG i.e., boil-off gas
  • the bypassing pipe 13 for detouring (bypassing) the cold box 4 is connected to the pipe 20.
  • the bypass-flow control valve 15 is provided on the bypassing pipe 13.
  • the mixed liquid-phase recirculated LNG is fed into the cargo tank 2 through the pipe 11 and is fed to the vicinity of the bottom of the interior of the cargo tank 2 via a nozzle 18-2, whereby the overall temperature of the liquid-phase LNG stored in the cargo tank 2 is lowered (IV in Fig. 2 ).
  • a portion of the recirculated LNG obtained by mixing together the liquid-phase recirculated LNG that has been cooled in the cold box 4 and the liquid-phase recirculated LNG that has not been cooled (that has passed through the bypassing pipe 13) is branched off from the pipe 11 to the pipe 14 and is sprayed from the boil-off-gas spraying nozzle 18 into the boil-off gas stored in the upper space in the cargo tank 2 (V in Fig. 2 ).
  • the boil-off gas is condensed due to the supercooling heat of the droplets.
  • the condensed and reliquefied boil-off gas drops onto the liquid surface of the liquid-phase LNG stored in the cargo tank 2 (VI in Fig. 2 ).
  • the pressure due to the boil-off gas inside the cargo tank 2 decreases. Thus, it becomes possible to prevent a pressure rise and to reduce pressure in the cargo tank 2.
  • the recirculation control valve 17 and the spraying control valve 16 are provided on the pipe 11 and the pipe 14 in the vicinity of the exterior of the cargo tank 2. By adjusting the degrees of opening of the recirculation control valve 17 and the spraying control valve 16, it is possible to adjust the flow rates of the supercooled liquid-phase recirculated LNG individually supplied to the liquid-phase LNG and boil-off gas stored in the cargo tank 2.
  • the nitrogen compressor 31 is driven by a driving source, which is not shown, to compress nitrogen that is fed via a pipe 38, making it high-temperature, high-pressure nitrogen.
  • the compressed, high-temperature nitrogen is fed from the nitrogen compressor 31 to the first heat exchanger 34 via a pipe 39.
  • the high-temperature, high-pressure nitrogen fed to the first heat exchanger 34 exchanges heat with clean water serving as refrigerant.
  • the high-pressure nitrogen that has been cooled by exchanging heat with the clean water is fed out from the first heat exchanger 34 to a pipe 40.
  • the high-pressure nitrogen at a lower temperature, fed out to the pipe 40 is fed into the cold box 4.
  • the high-pressure nitrogen fed into the cold box 4 from the pipe 40 exchanges heat with nitrogen gas fed into the cold box 4 from the pipe 37, which will be described later, whereby the high-pressure nitrogen is cooled.
  • the high-pressure nitrogen cooled in the precooling unit C1 is fed from the precooling unit C1 to the nitrogen expander 33 via a pipe 41.
  • the high-pressure nitrogen fed into the nitrogen expander 33 is expanded by reducing its pressure, becoming low-temperature, low-pressure nitrogen gas.
  • the low-temperature, low-pressure nitrogen gas exchanges heat with the liquid-phase recirculated LNG fed into the cold box 4 from the pipe 20 of the LNG recirculating system 10.
  • the low-temperature, low-pressure nitrogen gas fed into the cooling unit C2 from the pipe 37 imparts its cooling heat to the liquid-phase recirculated LNG, whereby the liquid-phase recirculated LNG is cooled.
  • the nitrogen gas that has exchanged heat with the liquid-phase recirculated LNG in the cooling unit C2 is further fed to the precooling unit C1 in the cold box 4, whereby the high-pressure nitrogen fed from the pipe 40, described earlier, is cooled.
  • the nitrogen gas that has exchanged heat with the high-pressure nitrogen fed from the pipe 40 in the precooling unit C1 is fed out to a pipe 42 via the pipe 41 and the nitrogen expander 33, whereby it is fed to the nitrogen booster 32.
  • the nitrogen booster 32 compresses the nitrogen fed from the pipe 42.
  • the compressed, high-temperature nitrogen is fed out to a pipe 43 connected between the nitrogen booster 32 and the second heat exchanger 35.
  • the compressed, high-temperature nitrogen fed out to the pipe 43 is fed into the second heat exchanger 35, where the nitrogen is cooled by exchanging heat with clean water serving as refrigerant.
  • the cooled nitrogen is fed from the second heat exchanger 35 to the nitrogen compressor 31 via the pipe 38.
  • the nitrogen refrigerant cycle 30 is repeated in the manner described above.
  • the vent pipe 21 connected to the top of the cargo tank 2 communicates with the outside via the cold box 4.
  • the boil-off gas fed from the vent pipe 21 to the cold box 4 exchanges heat with the nitrogen gas fed from the pipe 37 of the nitrogen refrigerant cycle 30 in the cooling unit C2 and the precooling unit C1, in that order, in the cold box 4.
  • the boil-off gas is cooled by exchanging heat with the nitrogen gas in the nitrogen refrigerant cycle 30, as described above.
  • the cooled boil-off gas is fed out from the cold box 4 and is fed to a boiler, etc., which is not shown, where the gas is used as fuel gas, etc.
  • FIG. 3 is a graph showing how these heat exchanges occur.
  • Fig. 3(A) shows heat exchange by boil-off gas in the cold box 204 of the conventional reliquefaction apparatus 201 shown in Fig. 9
  • Fig. 3(B) shows heat exchange by the liquid-phase recirculated LNG in the cold box 4 provided in the pressure-rise suppressing apparatus 1 according to this embodiment.
  • the vertical axis represents the temperature T of the boil-off gas, liquid-phase recirculated LNG, or refrigerant
  • the horizontal axis represents the amount of heat exchanged.
  • Fig. 4 shows a schematic diagram representing the temperature differences of nitrogen and liquid-phase recirculated LNG at the inlet and outlet of the cold box 4 according to this embodiment and the nitrogen pressure ratio at the inlet and outlet of the nitrogen compressor 31.
  • Fig. 5 shows a graph representing the relationship among the nitrogen temperature and the temperature difference and pressure ratio at the inlet and outlet of the cold box, shown in Fig. 4 .
  • the left vertical axis represents the temperature of the nitrogen gas serving as refrigerant at the outlet of the cold box 4
  • the horizontal axis represents the nitrogen pressure ratio at the inlet and outlet of the cold box 4
  • the right vertical axis represents the temperature difference at the inlet and outlet of the cold box.
  • broken line L1 represents the saturation temperature of the nitrogen gas
  • line L2 represents the temperature of the nitrogen gas at the outlet of the cold box 4
  • line L3 represents the temperature difference of the nitrogen gas at the inlet and outlet of the cold box 4.
  • the boil-off gas fed to the cold box 204 is cooled in the cold box 204 by low-temperature, low-pressure nitrogen gas serving as refrigerant.
  • the LNG fed to the inlet of the cold box 204 is in the gas phase, as represented by gas I in Fig. 3(A) , and it is cooled by the nitrogen gas (II in Fig. 3(A) ) and enters the gas-liquid dual phase (III in Fig. 3(A) ) constituted of the liquid phase and the gas phase.
  • the LNG in the gas-liquid dual phase is condensed and reliquefied (into the liquid phase) (IV in Fig. 3(A) ) by further exchanging heat with the nitrogen gas in the cold box 204.
  • liquid-phase recirculated LNG is fed to the cold box 4.
  • heat is simply exchanged between single-phase (liquid-phase) recirculated LNG (I in Fig. 3(B) ) and nitrogen gas (II in Fig. 3(B) ).
  • the temperature differences of the liquid-phase recirculated LNG and nitrogen at the inlet and outlet of the cold box 4 become smaller (V in Fig. 3(B) ) compared with the conventional case shown in Fig. 3(A) .
  • the nitrogen temperature difference at the inlet and outlet of the cold box 4 is proportional to the nitrogen pressure ratio at the inlet and outlet of the cold box 4. That is, the nitrogen temperature difference at the inlet and outlet of the cold box 4 is proportional to the pressure difference (pressure ratio) at the inlet and outlet of the nitrogen compressor 31, as indicated by II in Fig. 4 and by Fig. 5 .
  • the nitrogen temperature difference becomes smaller, it is possible to reduce the pressure difference generated by the nitrogen compressor 31. Accordingly, it is possible to reduce the required intake/discharge pressure ratio of the nitrogen compressor 31 provided in the nitrogen refrigerant cycle 30 and to reduce the number of stages compared with a conventional two-stage nitrogen compressor 231 (see Fig. 9 ), realizing the single-stage nitrogen compressor 31.
  • the pressure-rise suppressing apparatus 1 for the cargo tank 2 As described above, with the pressure-rise suppressing apparatus 1 for the cargo tank 2 according to this embodiment, the pressure-rise suppressing system including the same, the suppressing method for the same, and the liquefied-natural-gas cargo ship equipped with the same, the following operations and advantages are realized.
  • Liquid-phase LNG (liquefied gas, recirculated LNG) extracted from the cargo tank (storage tank) 2 is cooled by exchanging heat with nitrogen gas (refrigerant) in the cold box (heat exchange means) 4, and the cooled liquid-phase recirculated LNG is fed to the liquid-phase LNG stored in the cargo tank 2 via the pipe (feeding means) 11.
  • nitrogen gas refrigerant
  • the pipe (feeding means) 11 it is possible to cool the liquid-phase LNG stored in the cargo tank 2 by using the liquid-phase recirculated LNG fed from the pipe 11. This makes it possible to lower the overall temperature of the liquid-phase LNG stored in the cargo tank 2, suppressing gasification of the liquid-phase LNG.
  • Liquid-phase recirculated LNG extracted from the cargo tank 2 is cooled by exchanging heat with nitrogen gas in the cold box 4, and the cooled liquid-phase recirculated LNG is sprayed into the boil-off gas (gas-phase LNG) in the cargo tank 2 by means of the boil-off-gas spraying nozzle (spraying means) 18.
  • the boil-off-gas spraying nozzle spraying means 18 18.
  • liquid-phase recirculated LNG having an increased droplet diameter drops on the surface of the liquid-phase LNG (liquid surface) stored in the cargo tank 2.
  • the recirculation control valve (feeding-flow-rate adjusting means) 17 for adjusting the recirculating amount (flow rate) of the liquid-phase recirculated LNG cooled in the cold box 4, which is fed to the liquid-phase LNG stored in the cargo tank 2, is provided at the feeding means.
  • the overall temperature of the liquid-phase LNG stored in the cargo tank 2 increases due to incoming heat, it is possible to suppress a pressure rise in the cargo tank 2.
  • the spraying control valve (spraying-amount adjusting means) 16 for adjusting the spraying amount of the liquid-phase recirculated LNG cooled in the cold box 4, which is fed to the boil-off gas in the cargo tank 2, is provided at the boil-off-gas spraying nozzle 18.
  • the bypassing pipe (bypassing means) 13 is provided for making a portion of the liquid-phase recirculated LNG extracted from the cargo tank 2 bypass (detour) the cold box 4 and feeding it to the pipe 11 and (and/or) the boil-off-gas spraying nozzle 18.
  • the bypass-flow control valve (bypass-flow-rate adjusting means) 15 is provided for adjusting the bypassing flow rate (flow rate) of the liquid-phase recirculated LNG that is passed through the bypassing pipe 13.
  • the pressure-rise suppressing system (not shown) is provided with the pressure-rise suppressing apparatus 1 that can cool single-phase (liquid-phase) recirculated LNG to cool liquid-phase LNG or reliquefy boil-off gas stored in the cargo tanks 2 installed in the liquefied-natural-gas cargo ship (liquefied-gas cargo ship).
  • the pressure-rise suppressing apparatus 1 can cool single-phase (liquid-phase) recirculated LNG to cool liquid-phase LNG or reliquefy boil-off gas stored in the cargo tanks 2 installed in the liquefied-natural-gas cargo ship (liquefied-gas cargo ship).
  • This embodiment differs from the first embodiment in that a flash tank for storing a portion of boil-off gas and liquid-phase LNG extracted from a cargo tank is provided, and the liquid-phase LNG extracted from the flash tank is circulated to the flash tank as recirculated LNG, and is otherwise the same.
  • the same reference signs will be attached thereto, and descriptions thereof will be omitted.
  • Fig. 6 shows a schematic diagram of the construction of a pressure-rise suppressing apparatus 51 according to this embodiment.
  • an LNG recirculating system 60 includes a cargo tank (reserve tank) 61 that is provided as a storage tank, a flash tank (intermediate tank) 62 that is provided between the cargo tank 61 and the cold box (heat exchange means) 4, and an LNG circulating pump 63 for recirculating the liquid-phase LNG (liquefied gas) stored in the flash tank 62.
  • the LNG circulating pump 63 in this embodiment is provided separately from an LNG loading pump.
  • the flash tank 62 temporarily stores liquid-phase LNG extracted from the cargo tank 61 and boil-off gas (gas-phase LNG) generated in the cargo tank 61.
  • a portion of the liquid-phase LNG is fed to this flash tank 62 from the cargo tank 61 by a loading pump, which is not shown, and the boil-off gas stored in the upper space in the cargo tank 61 is also fed thereto.
  • a portion of the liquid-phase LNG stored in the flash tank 62 (recirculated LNG) is fed out to the pipe 20 by the LNG circulating pump 63.
  • the liquid-phase recirculated LNG fed out to the pipe 20 is fed to the cold box 4 and exchanges heat in the cooling unit C2 in the cold box 4 with low-temperature, low-pressure nitrogen gas (refrigerant) fed from the nitrogen refrigerant cycle 30.
  • the liquid-phase recirculated LNG is cooled and fed out to the pipe (feeding means) 11.
  • the cooled liquid-phase recirculated LNG fed out to the pipe 11 is fed from the vicinity of the bottom of the flash tank 62 to the liquid-phase LNG stored in the flash tank 62 via a nozzle 18'.
  • the liquid-phase LNG in the flash tank 62 is cooled by the recirculated LNG.
  • the portion of the liquid-phase recirculated LNG fed out to the pipe 11 is fed to the upper space of the flash tank 62 and is sprayed into the boil-off gas in the flash tank 62 via the boil-off-gas spraying nozzle (spraying means) 18.
  • the boil-off gas in the flash tank 62 is condensed, and the condensed (reliquefied) boil-off gas drops onto the liquid phase in the flash tank 62.
  • a liquid transfer pipe 65 for transferring the liquid-phase LNG in the flash tank 62 to the cargo tank 61, a liquid pressure-application and transfer pipe 66 for applying pressure to the liquid-phase LNG in the cargo tank 61 and transferring the LNG to the lower part in the flash tank 62, and a gas transfer pipe 67 for transferring the boil-off gas in the cargo tank 61 to the upper part in the flash tank 62 are provided.
  • the liquid-phase LNG that has been cooled in the flash tank 62 is fed from the flash tank 62 into the cargo tank 61 via the liquid transfer pipe 65.
  • the liquid-phase LNG stored in the cargo tank 61 is cooled. This makes it possible to suppress a pressure rise in the cargo tank 61.
  • the cargo tank (reserve tank) 61, and the flash tank (intermediate tank) 62 between the cargo tank 61 and the cold box (heat exchange means) 4, are provided, and the liquid-phase recirculated LNG (liquefied gas) that has been cooled by the cold box 4 is fed back to the flash tank 62.
  • the capacity of the cargo tank 61 is relatively small, it is possible to store a portion of the liquid-phase recirculated LNG that has been cooled in the cold box 4 in the flash tank 62, without feeding the whole liquid-phase recirculated LNG that has been cooled in the cold box 4 to the cargo tank 61. Accordingly, even in the case where the capacity of the cargo tank 61 is relatively small, it is possible to cool the liquid-phase LNG stored in the cargo tank 61 to an appropriate temperature.
  • the pipe (feeding means) 11 and the boil-off-gas spraying nozzle (spraying means) 18 are provided at the flash tank 62.
  • the pressure-rise suppressing system according to the present invention is applicable not only to a liquefied-natural-gas cargo ship but also to liquefied-natural-gas storage equipment (not shown) that stores LNG.
  • liquefied natural gas is used as liquefied gas in the description of the first and second embodiments
  • the present invention is not limited thereto, and the liquefied gas may be liquefied petroleum gas (LPG), ethane, ethylene, ammonia, or a mixture thereof.
  • the liquid-phase recirculated LNG that has been cooled by the cold box 4 is fed to both liquid-phase LNG and boil-off gas stored in the cargo tank 2 or the flash tank 62
  • the liquid-phase recirculated LNG may be fed to either liquid-phase LNG or boil-off gas stored in the cargo tank 2 or the flash tank 62.
  • the pressure-rise suppressing system may be configured such that a variety of kinds of liquefied gas, varying among cargo tanks installed in a liquefied-gas cargo ship or cargo tanks installed in liquefied-gas storage equipment, is stored.
  • the pressure-rise suppressing system is configured such that it is possible with the single pressure-rise suppressing apparatus to cool the variety of kinds of liquefied gas stored in the individual cargo tanks, it is possible to simplify a pressure-rise suppressing system installed in a liquefied-gas cargo ship or liquefied-gas storage equipment and to reduce equipment costs.

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Claims (11)

  1. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1;51) mit:
    einem Speichertank (2), der angeordnet ist, um verflüssigtes Gas zu speichern,
    einem Wärmeaustauschmittel (4), das angeordnet ist, um Wärme zwischen dem verflüssigten Gas in flüssiger Phase, das von dem Speichertank (2) extrahiert wird, und einem Kältemittel auszutauschen,
    einem Kältemittelkompressionsmittel (31,32), das angeordnet ist, um das Kältemittel, das dem Wärmeaustauschmittel (4) zuzuführen ist, zu komprimieren,
    einem Kältemittelexpansionsmittel (33), das angeordnet ist, um den Druck des Kältemittels, das durch das Kältemittelkompressionsmittel (31,32) komprimiert wurde, zu verringern, und das angeordnet ist, um das Kältemittel dem Wärmeaustauschmittel (4) zuzuführen,
    einem Zuführmittel (11), das angeordnet ist, um das verflüssigte Gas in flüssiger Phase, das in dem Wärmeaustauschmittel (4) gekühlt wurde, dem verflüssigten Gas in flüssiger Phase in dem Speichertank (2) zuzuführen,
    einem Beipassmittel (13), das angeordnet ist, um einen Teil des verflüssigten Gases in flüssiger Phase, das dem Wärmeaustauschmittel (4) zugeführt wurde, an dem Wärmeaustauschmittel (4) vorbeizuführen, und das angeordnet ist, um den Teil dem Zuführmittel (11) zuzuführen,
    einem Beipassströmungsraten-Einstellmittel (15), das angeordnet ist, um die Beipassströmungsrate des verflüssigten Gases in flüssiger Phase, das durch das Beipassmittel (13) passiert, einzustellen, und
    einem Temperaturmessmittel (19), das angeordnet ist, um die Temperatur eines verflüssigten Gases zu messen, das mit dem Teil des verflüssigten Gases in flüssiger Phase, das den Wärmetauscher (4) passiert hat, und den Teil des verflüssigten Gases in flüssiger Phase, das das Beipassmittel (13) passiert hat, zusammenzuführen und zu vermischen, wobei
    das Beipassströmungsraten-Einstellmittel (15) angeordnet ist, um die Beipassströmungsrate auf der Basis des Messergebnisses durch das Temperaturmessmittel (19) einzustellen.
  2. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1;51) gemäß Anspruch 1, ferner mit:
    einem Rohr (14) das von dem Zuführmittel (11) abzweigt und das zu dem Speichertank (2) geführt ist, und
    einem Sprühmittel (18), das an dem Ende des Rohrs (14) vorgesehen ist und das angeordnet ist, um das verflüssigte Gas in flüssiger Phase, das in dem Wärmeaustauschmittel (4) gekühlt wurde, in das verflüssigte Gas in Gasphase in dem Speichertank (2) einzusprühen.
  3. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1:51) gemäß Anspruch 2, wobei das Sprühmittel (18) ein Sprühmengeneinstellmittel (16) aufweist, das angeordnet ist, um die Sprühmenge des verflüssigten Gases in flüssiger Phase, das in dem Wärmeaustauschmittel (4) gekühlt wurde, einzustellen.
  4. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1;51) gemäß einem der Ansprüche 1 bis 3, wobei das Wärmeaustauschmittel (4) ferner aufweist:
    eine Kühleinheit (C2), die angeordnet ist, um Wärme zwischen einem Niederdruck-, Niedertemperatur-Kältemittel, das durch das Kältemittelexpansionsmittel (33) expandiert wurde, und dem verflüssigten Gas in flüssiger Phase auszutauschen, und
    eine Vorkühleinheit (C1), die angeordnet ist, um Wärme zwischen einem Niedertemperatur-, Niederdruck-Kältemittel, das an der Kühleinheit (C2) einem Wärmeaustausch unterzogen wurde, und einem Hochdruck-Kältemittel, das durch das Kältemittelkompressionsmittel (31,32) komprimiert wurde, auszutauschen.
  5. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1;51) gemäß einem der Ansprüche 1 bis 4, wobei das Zuführmittel (11) ein Zuführströmungsraten-Einstellmittel (17) aufweist, das angeordnet ist, um die Zuführströmungsrate des verflüssigten Gases in flüssiger Phase, das in dem Wärmeaustauschmittel (4) gekühlt wurde, einzustellen.
  6. Eine Speichertank-Druckaufbau-Unterdrückungsvorrichtung (51) gemäß einem der Ansprüche 1 bis 5,
    wobei der Speichertank (2) aufweist:
    einen Reservetank (61), und
    einen Zwischentank (62), der zwischen dem Reservetank (61) und dem Wärmeaustauschmittel (4) vorgesehen ist und der konfiguriert ist, um das verflüssigte Gas in flüssiger Phase und/oder das verflüssigte Gas in Gasphase, das von dem Reservetank (61) extrahiert wurde, temporär zu speichern,
    wobei das Zuführmittel (11) und/oder das Sprühmittel (18) an dem Zwischentank (62) vorgesehen sind, und
    wobei das verflüssigte Gas in flüssiger Phase, das in dem Wärmeaustauschmittel (4) gekühlt wurde, dem Zwischentank (62) zugeführt wird.
  7. Ein Druckaufbau-Unterdrückungssystem mit einer Speichertank-Druckaufbau-Unterdrückungsvorrichtung (1;51) gemäß einem der Ansprüche 1 bis 6,
    wobei mehrere Speichertanks als der Speichertank (2) vorgesehen sind, und
    wobei das in den einzelnen Speichertanks gespeicherte verflüssigte Gas aus Gasarten besteht, die zwischen den Speichertanks verschieden sind.
  8. Ein Flüssiggas-Frachtschiff mit einem Druckaufbau-Unterdrückungssystem gemäß Anspruch 7.
  9. Eine Flüssiggas-Speicheranlage mit einem Druckaufbau-Unterdrückungssystem gemäß Anspruch 7.
  10. Ein Speichertank-Druckaufbau-Unterdrückungsverfahren, wobei
    verflüssigtes Gas in flüssiger Phase, das von einem Speichertank (2), der das verflüssigte Gas speichert, extrahierte wird, durch Wärmeaustausch zwischen dem verflüssigten Gas in flüssiger Phase und einem Kältemittel, das komprimiert und dann expandiert wurde, gekühlt wird, und
    das verflüssigte Gas in flüssiger Phase, das durch den Wärmeaustausch gekühlt wurde, dem verflüssigten Gas in flüssiger Phase und/oder einem verflüssigten Gas in Gasphase, das in dem Speichertank (2) gespeichert ist, zugeführt wird, wobei das Verfahren aufweist
    einen Beipassschritt, um einen Teil des verflüssigten Gases in flüssiger Phase, das dem Speichertank (2) zugeführt wird, ohne Wärmeaustausch mit dem Kältemittel vorbeizuführen,
    einen Beipassströmungsraten-Einstellschritt zum Einstellen der Beipassströmungsrate des verflüssigten Gases in flüssiger Phase, das durch den Beipassschritt vorbeigeführt wird, und
    einen Temperaturmessschritt zum Messen der Temperatur eines verflüssigten Gases, das aus dem Teil des verflüssigten Gases in flüssiger Phase, das durch den Wärmeaustausch gekühlt wird, und dem Teil des verflüssigten Gases in flüssiger Phase, das durch den Beipassschritt vorbeigeführt wird, zusammengeführt und gemischt wird, wobei
    der Beipassströmungsraten-Einstellschritt die Beipassströmungsrate auf der Basis des Messergebnisses durch den Temperaturmessschritt einstellt.
  11. Ein Speichertank-Druckaufbau-Unterdrückungsverfahren gemäß Anspruch 10, wobei
    der Wärmeaustauschschritt aufweist
    einen ersten Wärmeaustauschschritt zum Austauschen von Wärme zwischen Niederdruck-, Niedertemperatur-Kältemittel und dem verflüssigten Gas in flüssiger Phase, und
    einen zweiten Wärmeaustauschschritt zum Austauschen von Wärme zwischen Niedertemperatur-, Niederdruck-Kältemittel, das einem Wärmeaustausch bei dem ersten Wärmeaustauschschritt unterzogen wird, und dem Hochdruck-Kältemittel.
EP12841914.0A 2011-10-20 2012-10-18 Druckaufbau-unterdrückungsvorrichtung für einen speichertank, druckaufbau-unterdrückungssystem damit, unterdrückungsverfahren dafür, flüssiggastransportgefäss damit und flüssiggas-lagerungsanlage damit Active EP2775194B1 (de)

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JP2011230785A JP2013087911A (ja) 2011-10-20 2011-10-20 貯蔵槽の圧力上昇抑制装置、これを備えた圧力上昇抑制システム、この抑制方法、これを備えた液化ガス運搬船およびこれを備えた液化ガス貯蔵設備
PCT/JP2012/076921 WO2013058308A1 (ja) 2011-10-20 2012-10-18 貯蔵槽の圧力上昇抑制装置、これを備えた圧力上昇抑制システム、この抑制方法、これを備えた液化ガス運搬船およびこれを備えた液化ガス貯蔵設備

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KR101688705B1 (ko) 2016-12-21
WO2013058308A1 (ja) 2013-04-25
EP2775194A1 (de) 2014-09-10
EP2775194A4 (de) 2015-10-28
CN103857955B (zh) 2015-07-01
JP2013087911A (ja) 2013-05-13
CN103857955A (zh) 2014-06-11

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