JP6923640B2 - 船舶用の蒸発ガス再液化装置及び蒸発ガス再液化方法 - Google Patents
船舶用の蒸発ガス再液化装置及び蒸発ガス再液化方法 Download PDFInfo
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- JP6923640B2 JP6923640B2 JP2019513443A JP2019513443A JP6923640B2 JP 6923640 B2 JP6923640 B2 JP 6923640B2 JP 2019513443 A JP2019513443 A JP 2019513443A JP 2019513443 A JP2019513443 A JP 2019513443A JP 6923640 B2 JP6923640 B2 JP 6923640B2
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Description
Claims (20)
- 船舶に設置された液化ガス貯蔵タンクで発生する蒸発ガスを別の冷熱供給サイクルを設置せずに自己熱交換により再液化して、前記液化ガス貯蔵タンクで発生する蒸発ガスの全量が再液化されて前記液化ガス貯蔵タンクに戻される船舶用の蒸発ガス再液化装置において、
前記液化ガス貯蔵タンクから排出される蒸発ガスを圧縮する圧縮機;及び
前記圧縮機によって圧縮された蒸発ガスを前記液化ガス貯蔵タンクから排出される蒸発ガスと熱交換させて冷却する熱交換器;を備え、
前記熱交換器を通過することで冷却された蒸発ガスを第1流れと第2流れとの2つの流れに分岐させ、
分岐させた第1流れを膨張させる第1膨張手段;
前記第1膨張手段によって膨張された第1流れを冷媒とし、前記第1流れを分岐させて残った第2流れを冷却する第1中間冷却器;及び
前記第1中間冷却器を通過した第2流れを収容する収容器;をさらに備え、
前記収容器によって前記圧縮機の後段の圧力が制御されることを特徴とする、船舶用の蒸発ガス再液化装置。 - 前記収容器から流体を排出させて、前記収容器の圧力を調節する圧力制御ライン;をさらに備え、
前記圧力制御ラインを介して排出される流体は、前記液化ガス貯蔵タンクに戻されるかまたは外部に排出されることを特徴とする、請求項1に記載の船舶用の蒸発ガス再液化装置。 - 前記収容器から流体を排出させて、前記収容器のレベルを制御するレベル制御ライン;をさらに備え、
前記レベル制御ラインを介して排出される流体の少なくとも一部が、前記液化ガス貯蔵タンクに戻されることを特徴とする、請求項1または2に記載の船舶用の蒸発ガス再液化装置。 - 前記レベル制御ライン上に設けられ、前記レベル制御ラインに沿って前記液化ガス貯蔵タンクに戻される流体を膨張させる第3膨張手段;をさらに備えることを特徴とする、請求項3に記載の船舶用の蒸発ガス再液化装置。
- 前記圧縮機の後段の圧力は40〜100baraであることを特徴とする、請求項4に記載の船舶用の蒸発ガス再液化装置。
- 前記圧縮機で圧縮された蒸発ガスの温度は80〜130℃であることを特徴とする、請求項4に記載の船舶用の蒸発ガス再液化装置。
- 前記圧縮機の後段に設けられ、前記圧縮機で圧縮された蒸発ガスを冷却する後段冷却器;をさらに備え、
前記後段冷却器で冷却された蒸発ガスの温度は12〜45℃であることを特徴とする、請求項4に記載の船舶用の蒸発ガス再液化装置。 - 前記第1膨張手段で膨張された蒸発ガスは4〜15baraであることを特徴とする、請求項4に記載の船舶用の蒸発ガス再液化装置。
- 前記レベル制御ライン上に設けられ、前記収容器から排出される流体を第3流れ及び第4流れを含む少なくとも2つの流れに分岐させ、分岐させた第3流れを膨張させる第2膨張手段;及び
前記第2膨張手段によって膨張された第3流れを冷媒とし、前記第3流れを分岐させて残った第4流れを冷却する第2中間冷却器;を備え、
前記第2中間冷却器を通過した第4流れは、前記液化ガス貯蔵タンクに戻され、
前記第2中間冷却器を通過した第3流れは、前記圧縮機に供給されることを特徴とする、請求項4に記載の船舶用の蒸発ガス再液化装置。 - 前記第2膨張手段で膨張された蒸発ガスは2〜5baraであることを特徴とする、請求項9に記載の船舶用の蒸発ガス再液化装置。
- 前記圧縮機は、複数の圧縮部を備える多段圧縮機であり、
前記第1中間冷却器を通過した第1流れ及び前記第2中間冷却器を通過した第3流れは、前記複数の圧縮部のいずれかの圧縮部の後段にそれぞれ供給されることを特徴とする、請求項9に記載の船舶用の蒸発ガス再液化装置。 - 船舶に設置された液化ガス貯蔵タンクで発生する蒸発ガスを別の冷熱供給サイクルを設置せずに自己熱交換により再液化して、前記液化ガス貯蔵タンクで発生する蒸発ガスの全量が再液化されて前記液化ガス貯蔵タンクに戻される船舶用の蒸発ガス再液化方法において、
液化ガスから発生した蒸発ガスを圧縮機で圧縮し、
圧縮された蒸発ガスを前記液化ガスから発生した蒸発ガスによって冷却し、
冷却された蒸発ガスを第1流れと第2流れとに分岐させて、第1流れを膨張させ、
膨張させた蒸発ガスによって前記第2流れを冷却し、
冷却された第2流れを収容器に供給し、
前記収容器の圧力を制御して、前記圧縮機の後段の圧力を制御することを特徴とする、船舶用の蒸発ガス再液化方法。 - 前記収容器から流体を排出させて前記液化ガス貯蔵タンクに供給する場合において、
前記収容器から排出される気体の流れを制御して、前記収容器の内圧または前記圧縮機の後段の圧力を設定値に維持することを特徴とする、請求項12に記載の船舶用の蒸発ガス再液化方法。 - 前記圧縮機の後段の圧力の設定値は40〜100baraであることを特徴とする、請求項13に記載の船舶用の蒸発ガス再液化方法。
- 前記収容器から液体を排出させて、第3流れ及び第4流れに分岐させ、
分岐させた第3流れを膨張させて前記第4流れを冷却し、
冷却された第4流れを前記液化ガス貯蔵タンクに供給することを特徴とする、請求項13に記載の船舶用の蒸発ガス再液化方法。 - 前記冷却された第4流れを膨張させて前記液化ガス貯蔵タンクに供給し、
前記収容器のレベルを測定して、前記冷却された第4流れの膨張程度を調節することを特徴とする、請求項15に記載の船舶用の蒸発ガス再液化方法。 - 前記圧縮機は、複数の圧縮部を備える多段圧縮機であり、
前記第1流れを、4〜15baraで膨張させ、
前記第3流れを、2〜5baraで膨張させ、
膨張させた第1流れと膨張させた第3流れとを、前記第2流れ及び前記第4流れを冷却した後で前記多段圧縮機に供給し、
前記膨張させた第3流れを、前記膨張させた第1流れが供給される圧縮部よりも前段の圧縮部の下流に供給することを特徴とする、請求項15に記載の船舶用の蒸発ガス再液化方法。 - 前記圧縮機で圧縮した圧縮蒸発ガスは、前記液化ガスから発生した蒸発ガスと熱交換させる前に、12〜45℃に冷却することを特徴とする、請求項13に記載の船舶用の蒸発ガス再液化方法。
- エタン、プロパン、ブタンを含む群から選択される少なくとも1つ以上を含む液化ガスから自然気化した蒸発ガスを、別の冷熱供給サイクルを使用せずに自己熱交換により再液化する船舶用の蒸発ガス再液化方法であって、
前記蒸発ガスを圧縮して、圧縮された蒸発ガスを圧縮する前の蒸発ガスと熱交換させて冷却した後、
冷却された蒸発ガスの一部を膨張させ、膨張された蒸発ガスと膨張されなかった残りの蒸発ガスとの熱交換を1回以上実施して、前記蒸発ガスの全量を再液化することを特徴とする、船舶用の蒸発ガス再液化方法。 - 再液化された蒸発ガスを圧力容器に貯蔵して、前記圧力容器の内圧を制御することにより、圧縮蒸発ガスが再液化されて前記圧力容器に貯蔵されるまでの圧力を設定値に維持することを特徴とする、請求項19に記載の船舶用の蒸発ガス再液化方法。
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