JP2018528894A - エンジンを備えた船舶 - Google Patents
エンジンを備えた船舶 Download PDFInfo
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- 239000003507 refrigerant Substances 0.000 claims abstract description 49
- 238000001704 evaporation Methods 0.000 claims abstract description 22
- 239000007789 gas Substances 0.000 claims description 313
- 239000007788 liquid Substances 0.000 claims description 101
- VNWKTOKETHGBQD-UHFFFAOYSA-N methane Chemical compound C VNWKTOKETHGBQD-UHFFFAOYSA-N 0.000 claims description 56
- 239000003949 liquefied natural gas Substances 0.000 claims description 54
- 230000006837 decompression Effects 0.000 claims description 44
- 239000003345 natural gas Substances 0.000 claims description 24
- 239000000446 fuel Substances 0.000 claims description 23
- 238000000034 method Methods 0.000 claims description 14
- 238000000926 separation method Methods 0.000 claims 1
- 230000008020 evaporation Effects 0.000 abstract description 4
- 238000007906 compression Methods 0.000 description 42
- 230000006835 compression Effects 0.000 description 18
- 238000010586 diagram Methods 0.000 description 12
- 239000012530 fluid Substances 0.000 description 11
- 238000001816 cooling Methods 0.000 description 6
- 230000008439 repair process Effects 0.000 description 5
- 239000012809 cooling fluid Substances 0.000 description 3
- 238000012423 maintenance Methods 0.000 description 3
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 description 2
- 230000008901 benefit Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 238000002485 combustion reaction Methods 0.000 description 2
- 239000002826 coolant Substances 0.000 description 2
- 238000005057 refrigeration Methods 0.000 description 2
- 230000001174 ascending effect Effects 0.000 description 1
- 238000013461 design Methods 0.000 description 1
- 230000009977 dual effect Effects 0.000 description 1
- 238000009413 insulation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 229910052757 nitrogen Inorganic materials 0.000 description 1
- 238000012546 transfer Methods 0.000 description 1
- 238000011144 upstream manufacturing Methods 0.000 description 1
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63B—SHIPS OR OTHER WATERBORNE VESSELS; EQUIPMENT FOR SHIPPING
- B63B25/00—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby
- B63B25/02—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods
- B63B25/08—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid
- B63B25/12—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed
- B63B25/16—Load-accommodating arrangements, e.g. stowing, trimming; Vessels characterised thereby for bulk goods fluid closed heat-insulated
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B63—SHIPS OR OTHER WATERBORNE VESSELS; RELATED EQUIPMENT
- B63H—MARINE PROPULSION OR STEERING
- B63H21/00—Use of propulsion power plant or units on vessels
- B63H21/38—Apparatus or methods specially adapted for use on marine vessels, for handling power plant or unit liquids, e.g. lubricants, coolants, fuels or the like
-
- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F02—COMBUSTION ENGINES; HOT-GAS OR COMBUSTION-PRODUCT ENGINE PLANTS
- F02M—SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF
- F02M21/00—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form
- F02M21/02—Apparatus for supplying engines with non-liquid fuels, e.g. gaseous fuels stored in liquid form for gaseous fuels
- F02M21/0218—Details on the gaseous fuel supply system, e.g. tanks, valves, pipes, pumps, rails, injectors or mixers
- F02M21/0221—Fuel storage reservoirs, e.g. cryogenic tanks
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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
- F17C6/00—Methods and apparatus for filling vessels not under pressure with liquefied or solidified gases
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- 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
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- 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
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- 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"
- F25J1/004—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 flash gas recovery
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- 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
- F25J1/02—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
- F25J1/0201—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 only internal refrigeration means, i.e. without external refrigeration
- F25J1/0202—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 only internal refrigeration means, i.e. without external refrigeration in a quasi-closed internal refrigeration loop
-
- 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
- F25J1/0228—Coupling of the liquefaction unit to other units or processes, so-called integrated processes
- F25J1/0229—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock
- F25J1/023—Integration with a unit for using hydrocarbons, e.g. consuming hydrocarbons as feed stock for the combustion as fuels, i.e. integration with the fuel gas system
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- 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
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- F—MECHANICAL ENGINEERING; LIGHTING; HEATING; WEAPONS; BLASTING
- F17—STORING OR DISTRIBUTING GASES OR LIQUIDS
- F17C—VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED OR SOLIDIFIED GASES; FIXED-CAPACITY GAS-HOLDERS; FILLING VESSELS WITH, OR DISCHARGING FROM VESSELS, COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES
- F17C2223/00—Handled fluid before transfer, i.e. state of fluid when stored in the vessel or before transfer from the vessel
- 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
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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
- 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
- F17C2227/0157—Compressors
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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
- F17C2265/00—Effects achieved by gas storage or gas handling
- F17C2265/03—Treating the boil-off
- F17C2265/032—Treating the boil-off by recovery
- F17C2265/038—Treating the boil-off by recovery with expanding
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- 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
- F25J2220/00—Processes or apparatus involving steps for the removal of impurities
- F25J2220/60—Separating impurities from natural gas, e.g. mercury, cyclic hydrocarbons
- F25J2220/62—Separating low boiling components, e.g. He, H2, N2, Air
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- 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
- F25J2230/00—Processes or apparatus involving steps for increasing the pressure of gaseous process streams
- F25J2230/30—Compression of the feed stream
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
- Y02T10/00—Road transport of goods or passengers
- Y02T10/10—Internal combustion engine [ICE] based vehicles
- Y02T10/30—Use of alternative fuels, e.g. biofuels
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Abstract
Description
Claims (24)
- 貯蔵タンクから排出される蒸発ガスを熱交換させる自家熱交換器;
前記貯蔵タンクから排出された後に前記自家熱交換器を通過した蒸発ガスを多段階で圧縮する多段圧縮機;
前記多段圧縮機で圧縮された後に前記自家熱交換器を通過した蒸発ガスの一部を膨張させる第1減圧装置;
前記多段圧縮機で圧縮された後に前記自家熱交換器を通過した蒸発ガスの他の一部を膨張させる第2減圧装置;を備え、
前記自家熱交換器は、前記貯蔵タンクから排出される蒸発ガスと、前記第1減圧装置により膨張された蒸発ガスとを冷媒として、前記多段圧縮機で圧縮された蒸発ガスを冷却する、エンジンを備えた船舶。 - 前記第2減圧装置を通過した気液混合状態の蒸発ガスは、前記貯蔵タンクに送られることを特徴とする請求項1に記載のエンジンを備えた船舶。
- 前記第2減圧装置の下流に設置されて再液化された液化天然ガスと気体状態の蒸発ガスとを分離する第2気液分離器をさらに備え、
前記第2気液分離器で分離された液化天然ガスは前記貯蔵タンクに送られ、
前記第2気液分離器で分離された気体状態の蒸発ガスは前記自家熱交換器に送られることを特徴とする請求項1に記載のエンジンを備えた船舶。 - 前記多段圧縮機を通過した蒸発ガスの一部は高圧エンジンに送られることを特徴とする請求項1に記載のエンジンを備えた船舶。
- 前記高圧エンジンはME−GIエンジンであることを特徴とする請求項4に記載のエンジンを備えた船舶。
- 前記高圧エンジンは150〜400barの圧力の天然ガスを燃料として使用する請求項4に記載のエンジンを備えた船舶。
- 前記第1減圧装置及び前記自家熱交換器を通過した蒸発ガスは、発電機及び低圧エンジンのいずれか1つ以上に送られることを特徴とする請求項1に記載のエンジンを備えた船舶。
- 前記低圧エンジンは、DFエンジン、X−DFエンジン、ガスタービンのいずれかであることを特徴とする請求項7に記載のエンジンを備えた船舶。
- 前記低圧エンジンは6〜20barの圧力の天然ガスを燃料として使用することを特徴とする請求項7に記載のエンジンを備えた船舶。
- 前記低圧エンジンは55barの圧力の天然ガスを燃料として使用することを特徴とする請求項7に記載のエンジンを備えた船舶。
- 前記発電機は6〜10barの圧力の天然ガスを燃料として使用することを特徴とする請求項7に記載のエンジンを備えた船舶。
- 前記多段圧縮機は、蒸発ガスを臨界点以上の圧力まで圧縮することを特徴とする請求項1に記載のエンジンを備えた船舶。
- 前記多段圧縮機は、蒸発ガスを100bar以上の圧力まで圧縮することを特徴とする請求項12に記載のエンジンを備えた船舶。
- 前記第2気液分離器で分離されて前記自家熱交換器に送られる気体状態の蒸発ガスの流量を調節するバルブをさらに備える、請求項3に記載のエンジンを備えた船舶。
- 前記第1減圧装置及び前記自家熱交換器を通過した蒸発ガスを前記発電機に送るライン上に設置される、加熱器をさらに備える請求項7に記載のエンジンを備えた船舶。
- 前記多段圧縮機で圧縮されて前記自家熱交換器で冷却された後に前記第1減圧装置で膨張されて一部再液化された液化天然ガスと気体状態で残っている蒸発ガスとを分離する、第1気液分離器をさらに備え、
前記自家熱交換器は、前記貯蔵タンクから排出される蒸発ガスと、前記第1気液分離器で分離された液化天然ガスと、前記第1気液分離器で分離された蒸発ガスとを冷媒として、前記多段圧縮機で圧縮された蒸発ガスを冷却することを特徴とする、請求項1に記載のエンジンを備えた船舶。 - 前記第1気液分離器で分離された後に前記自家熱交換器を通過した液化天然ガスと、前記第1気液分離器で分離された後に前記自家熱交換器を通過した蒸発ガスは、合流して発電機及び低圧エンジンのいずれか1つ以上に送られることを特徴とする、請求項16に記載のエンジンを備えた船舶。
- 1)貯蔵タンクから排出された蒸発ガス(以下、「a流れ」という。)を多段階で圧縮し、
2)前記多段階で圧縮した蒸発ガス(以下、「b流れ」という。)を前記貯蔵タンクから排出された蒸発ガス(a流れ)及び「別の冷媒」と熱交換させ、
3)熱交換された蒸発ガス(b流れ)を2つの流れに分岐させ、
4)前記3)ステップで2つに分岐した流れのうち、一方の流れの蒸発ガスを膨張させて(以下、「c流れ」という。)、前記2)ステップにおいて前記b流れと熱交換される前記「別の冷媒」として使用し、
5)前記3)ステップで2つに分岐した流れのうち、他方の流れを膨張させる、方法。 - 6)前記5)ステップで膨張された後に一部液化された蒸発ガスを、液化天然ガスと気体状態の蒸発ガスとに分離し、
7)前記6)ステップで分離された液化天然ガスを前記貯蔵タンクに送り、前記6)ステップで分離された気体状態の蒸発ガスを、前記貯蔵タンクから排出される蒸発ガスと合流させて前記2)ステップにおける熱交換の冷媒として使用することを特徴とする、請求項18に記載の方法。 - 前記1)ステップにおいて多段階で圧縮された蒸発ガスの一部を高圧エンジンに送ることを特徴とする、請求項18に記載の方法。
- 前記4)ステップにおいて前記「別の冷媒」として使用された前記c流れを発電機及び低圧エンジンのいずれか1つ以上に送ることを特徴とする、請求項18に記載の方法。
- 1)貯蔵タンクから排出された蒸発ガス(以下、「a流れ」という。)を多段階で圧縮し、
2)前記多段階で圧縮した蒸発ガス(以下、「b流れ」という。)を、前記貯蔵タンクから排出された蒸発ガス(a流れ)、「第1冷媒」及び「第2冷媒」と熱交換させ、
3)熱交換された蒸発ガス(b流れ)を2つの流れに分岐させ、
4)前記3)ステップで2つに分岐した流れのうち一方の流れの蒸発ガスを膨張させ、
5)前記4)ステップで膨張された蒸発ガスを気液分離し、
6)前記5)ステップで分離された液化天然ガス(以下、「c流れ」という。)を、前記2)ステップにおいて前記b流れと熱交換する前記「第1冷媒」として使用し、
7)前記5)ステップで分離された蒸発ガス(以下、「d流れ」という。)を、前記2)ステップにおいて前記b流れと熱交換する前記「第2冷媒」として使用し、
8)前記3)ステップで2つに分岐した流れのうち他方の流れを膨張させる、方法。 - 前記6)ステップで前記「第1冷媒」として使用された前記c流れと、前記7)ステップで前記「第2冷媒」として使用された前記d流れを合流させ、発電機及び低圧エンジンのいずれか1つ以上に送ることを特徴とする、請求項22に記載の方法。
- 前記1)ステップにおいて多段階で圧縮された蒸発ガスの一部を高圧エンジンに送ることを特徴とする、請求項22に記載の方法。
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JP6347003B1 (ja) * | 2017-01-25 | 2018-06-20 | デウ シップビルディング アンド マリン エンジニアリング カンパニー リミテッド | Lng船の蒸発ガス再液化方法及びシステム |
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