PROBLEM TO BE SOLVED: To perform an efficient recovery of boil-off gas at a liquefaction gas carrier and improve a degree of freedom in selection of a target ship speed.SOLUTION: BOG in a cargo tank 11 is sent as cooling side gas to a first heat exchanger 14 through a first piping 12 and further compressed at a multi-stage high pressure gas compressor 15. Middle pressure BOG with a pressure more than a critical point is extracted from a middle stage of the high pressure gas compressor 15, transported as cooled side gas to the first heat exchanger 14 through a second piping 16 and cooled. BOG is further cooled with a re-cooling device 24, expanded by a Joule-Thomson valve 17 and liquefied. The liquefied BOG and gas-liquid double phase flow of gas gasified through flash are transferred to a separator 18. Gas composition separated by the separator 18 is returned back an upstream side of the first heat exchanger 14 at the first piping 12 through a pressure adjustment valve 19, liquid composition is returned back to the cargo tank 11 through 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の途中段から臨界点以上の圧力の中圧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する。BOGを再冷却装置24で更に冷却し、ジュールトムソンバルブ17で膨張させ液化する。液化されたBOGとフラッシュにより気化されたガスの気液2相流をセパレータ18へ移送する。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 :

    2016-09-23


    Medientyp :

    Patent


    Format :

    Elektronische Ressource


    Sprache :

    Japanisch


    Klassifikation :

    IPC:    F17C Behälter zum Aufnehmen oder Speichern verdichteter, verflüssigter oder verfestigter Gase , VESSELS FOR CONTAINING OR STORING COMPRESSED, LIQUEFIED, OR SOLIDIFIED GASES / B63B Schiffe oder sonstige Wasserfahrzeuge , SHIPS OR OTHER WATERBORNE VESSELS / F02M Zuführen von Brennstoff-Luft-Gemischen oder deren Bestandteilen bei Brennkraftmaschinen allgemein , SUPPLYING COMBUSTION ENGINES IN GENERAL WITH COMBUSTIBLE MIXTURES OR CONSTITUENTS THEREOF / 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



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