PROBLEM TO BE SOLVED: To efficiently recover boil-off gas in a liquefied gas carrier and increase flexibility of setting of a target vessel speed of the liquefied gas carrier.SOLUTION: BOG (Boil-Off Gas) in a cargo tank 11 is fed as cooling gas to a first heat exchanger 14 through first piping 12 and further compressed at a multi-stage high-pressure gas compressor 15. Middle pressure BOG is extracted from an intermediate stage of the high pressure gas compressor 15, fed as gas to be cooled to the first heat exchanger 14 through second piping 16 and cooled, and is expanded through a Joule-Thomson valve 17 and partially liquefied. This gas-liquid double-phase flow is cooled by a re-liquefaction device 28, a part of the residual boil-off gas is liquefied and transmitted to a first separator 18. Gas component separated by the first separator 18 is returned back to the upstream side of the first heat exchanger 14 of the first piping 12 through a pressure adjustment valve 19 and liquid component is returned back to the cargo tank 11 using a transfer pump 21.SELECTED DRAWING: Figure 1

    【課題】液化ガス運搬船において、ボイルオフガスを効率的に回収するとともに、ターゲット船速の選択の自由度を高める。【解決手段】カーゴタンク11内のBOGを第1配管12を通して第1熱交換器14に冷却側ガスとして送り、更に多段の高圧ガスコンプレッサ15において圧縮する。高圧ガスコンプレッサ15の途中段から中圧BOGを抽気し、第2配管16を通して第1熱交換器14に被冷却側ガスとして移送して冷却し、ジュールトムソンバルブ17で膨張させ、一部液化する。この気液2相流を再液化装置28で冷却し、更に残存ボイルオフガスの一部を液化し、第1セパレータ18へ移送する。第1セパレータ18で分離されたガス成分を圧力調整弁19を介して第1配管12の第1熱交換器14の上流側へ還流し、液体成分を移送ポンプ21を用いてカーゴタンク11に戻す。【選択図】図1


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    Titel :

    BOIL-OFF GAS RECOVERY SYSTEM


    Weitere Titelangaben:

    ボイルオフガス回収システム


    Beteiligte:
    YUASA SHINYA (Autor:in) / WATANABE TAKASHI (Autor:in)

    Erscheinungsdatum :

    2018-03-22


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    F25J LIQUEFACTION, SOLIDIFICATION, OR SEPARATION OF GASES OR GASEOUS MIXTURES BY PRESSURE AND COLD TREATMENT , Verflüssigen, Verfestigen oder Trennen von Gasen oder Gasgemischen durch Druck- und Kältebehandlung / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / B63H Schiffsantrieb oder Steuerung der Schiffe , MARINE PROPULSION OR STEERING / F02B INTERNAL-COMBUSTION PISTON ENGINES , Brennkraftmaschinen mit innerer Verbrennung mit Verdrängerwirkung / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF



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