JP7490787B2 - 船舶の液化ガス再気化システム及び液化ガス再気化方法 - Google Patents
船舶の液化ガス再気化システム及び液化ガス再気化方法 Download PDFInfo
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- JP7490787B2 JP7490787B2 JP2022547099A JP2022547099A JP7490787B2 JP 7490787 B2 JP7490787 B2 JP 7490787B2 JP 2022547099 A JP2022547099 A JP 2022547099A JP 2022547099 A JP2022547099 A JP 2022547099A JP 7490787 B2 JP7490787 B2 JP 7490787B2
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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
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Description
Claims (17)
- 液化ガスを第1熱媒体と熱交換させて気化させる気化器;と、
前記気化器からガス需要先に供給される再気化ガスを、第2熱媒体との熱交換により前記ガス需要先で要求される温度に加熱するトリムヒーター;と、
前記第1熱媒体が循環する第1循環部;と、
前記第2熱媒体が循環する第2循環部とを備え、
前記第1循環部は、
前記気化器に供給される第1熱媒体を熱源との熱交換により気化させる第1熱交換器;と、
前記第1熱交換器で気化させた第1熱媒体を膨張させて発電するエキスパンダ式発電機とを備え、
前記第2循環部は、
前記トリムヒーターに供給される第2熱媒体を熱源との熱交換により加熱する第2熱交換器を備え、
前記第1熱交換器で気化された第1熱媒体がエキスパンダ式発電機に供給されるように接続される第1熱媒体ラインから、前記エキスパンダ式発電機の上流で分岐し、前記エキスパンダ式発電機に供給される第1熱媒体が前記エキスパンダ式発電機を迂回して前記気化器に供給されるように接続される第1分岐ラインをさらに備える、船舶の液化ガス再気化システム。 - 前記熱源は、海水及び蒸気のうち少なくとも1つであることを特徴とする、請求項1記載の船舶の液化ガス再気化システム。
- 前記第1熱交換器及び前記第2熱交換器の熱源として使用される海水を吸入して供給する海水ポンプをさらに備え、
前記海水ポンプ、前記第1熱交換器及び前記第2熱交換器は、前記船舶の甲板より下部に設けられ、
前記気化器及び前記トリムヒーターは、前記船舶の上甲板より上部に設けられることを特徴とする、請求項1記載の船舶の液化ガス再気化システム。 - 前記第1熱媒体は、前記第1循環部を循環することで相変化を伴う冷媒であって、
火災及び爆発の危険がない自然冷媒、HFO系冷媒及びHFC系冷媒から選択される、単一冷媒または混合冷媒であることを特徴とする、請求項1記載の船舶の液化ガス再気化システム。 - 前記第2熱媒体はグリコールウォーターであることを特徴とする、請求項1記載の船舶の液化ガス再気化システム。
- 前記液化ガスを、前記ガス需要先で要求される再気化ガスの圧力以上の圧力に加圧して、前記気化器に供給する高圧ポンプ;と、
前記高圧ポンプから気化器に供給される液化ガスの流量を調節する第1バルブとをさらに備える、請求項1記載の船舶の液化ガス再気化システム。 - 前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの温度を測定する第1温度測定部;と、
前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの圧力を測定する第1圧力測定部;と、
前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの流量を測定する第1流量測定部;と、
前記第1温度測定部で測定された温度測定値、前記第1圧力測定部で測定された圧力測定値及び前記第1流量測定部で測定された流量測定値のうち、少なくとも1つ以上の測定値に基づいて、前記第1バルブの開度量を調節することで、前記液化ガスの再気化量を調節する第1制御部とをさらに備える、請求項6記載の船舶の液化ガス再気化システム。 - 前記トリムヒーターから排出され、熱交換により冷却された第2熱媒体の温度を測定する第2温度測定部;と、
前記第2温度測定部で測定された温度測定値に基づいて、前記第1バルブの開度量を調節することで、前記液化ガスの再気化量を調節する第1制御部とをさらに備える、請求項6記載の船舶の液化ガス再気化システム。 - 前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの温度を測定する第1温度測定部;と、
前記トリムヒーターから排出され、熱交換により冷却された第2熱媒体の温度を測定する第2温度測定部とを備え、
前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの圧力を測定する第1圧力測定部;及び
前記トリムヒーターから前記ガス需要先に供給される前記再気化ガスの流量を測定する第1流量測定部のうち、少なくとも1つ以上をさらに備え、
前記第1温度測定部で測定される温度測定値を一定範囲で維持するために調節が必要な第1バルブの開度量と、前記第2温度測定部で測定される温度測定値を一定範囲で維持するために調節が必要な第1バルブの開度量と、前記第1圧力測定部及び第1流量測定部のうち少なくとも1つ以上の測定値を一定範囲で維持するために調節が必要な第1バルブの開度量の中から、最小値を選択し、前記第1バルブの開度量を調節する第1制御部を備える、請求項6記載の船舶の液化ガス再気化システム。 - 前記気化器で液化ガスを気化させることで凝縮された第1熱媒体を収容するレシーバー;と、
前記第1熱媒体が気化器に供給される第1熱媒体ラインから前記気化器の上流で分岐し、前記第1熱媒体が前記気化器を迂回して前記レシーバーに供給されるように接続される第2分岐ライン;と、
前記レシーバー内の圧力を測定する第2圧力測定部;と、
前記第2圧力測定部で測定された圧力測定値に基づいて、前記第2分岐ラインに設けられる第2バルブの開度量を調節する第2制御部とを備える、請求項1記載の船舶の液化ガス再気化システム。 - 前記気化器で液化ガスを気化させることで凝縮された第1熱媒体を収容するレシーバー;と、
前記第1熱媒体が気化器に供給される第1熱媒体ラインから前記気化器の上流で分岐し、前記第1熱媒体が前記気化器を迂回して前記レシーバーに供給されるように接続される第2分岐ライン;と、
前記気化器からトリムヒーターに供給される再気化ガスの温度を測定する第3温度制御部;と、
前記第3温度制御部で測定された温度測定値に基づいて、前記第2分岐ラインに設けられる第2バルブの開度量を調節する第2制御部とを備える、請求項1記載の船舶の液化ガス再気化システム。 - 前記気化器で液化ガスを気化させることで凝縮された第1熱媒体を収容するレシーバー;と、
前記第1熱媒体が気化器に供給される第1熱媒体ラインから前記気化器の上流で分岐し、前記第1熱媒体が前記気化器を迂回して前記レシーバーに供給されるように接続される第2分岐ライン;と、
前記第2分岐ラインに設けられて開度量が調節される第2バルブ;と、
前記レシーバー内の圧力を測定する第2圧力測定部;と、
前記気化器からトリムヒーターに供給される再気化ガスの温度を測定する第3温度制御部;と、
前記第2圧力測定部で測定された圧力測定値を一定範囲で維持するために調節が必要な第2バルブの開度量、前記第3温度制御部で測定された温度測定値を一定範囲で維持するために調節が必要な第2バルブの開度量のうち、小さい値を選択して前記第2バルブの開度量を調節する第2制御部とを備える、請求項1記載の船舶の液化ガス再気化システム。 - 液化ガスを第1熱媒体との熱交換により気化させて、
前記第1熱媒体との熱交換により気化させた再気化ガスを、第2熱媒体との熱交換によりガス需要先で要求される温度に加熱して、
前記第1熱媒体を、
熱源との熱交換により気化させて、気化させた第1熱媒体を膨張させることで発電した後に、前記液化ガスと熱交換させる第1循環部を循環させて、
前記第2熱媒体を、
前記熱源との熱交換により加熱された後に、前記再気化ガスと熱交換させる第2循環部を循環させる液化ガス再気化方法において、
前記気化させた第1熱媒体の膨張による発電が不能である場合、または、前記液化ガスと前記第1熱媒体との熱交換で前記再気化ガスの再気化容量が増加することで前記第1熱媒体の循環流量が増加した場合には、気化させた第1熱媒体を膨張させずに、当該第1熱媒体が前記液化ガスと熱交換するように第1循環部を循環させる、液化ガス再気化方法。 - 前記第1熱媒体及び前記第2熱媒体を加熱するための熱源は、海水及び蒸気のうち少なくとも1つであり、
前記第1熱媒体は、前記第1循環部を循環することで相変化を伴う冷媒であって、火災及び爆発の危険がない自然冷媒、HFO系冷媒及びHFC系冷媒から選択される、単一冷媒または混合冷媒であり、
前記第2熱媒体はグリコールウォーターであることを特徴とする、請求項13記載の液化ガス再気化方法。 - 前記第1熱媒体との熱交換により気化させる前の液化ガスを、ガス需要先で要求される再気化ガスの圧力以上の圧力に加圧して前記第1熱媒体と熱交換させ、
前記第2熱媒体との熱交換により加熱されて、ガス需要先に供給される再気化ガスの圧力、温度及び流量のうち、少なくとも1つ以上を測定し、測定した測定値に基づいて前記第1熱媒体と熱交換させる液化ガスの流量を制御する、請求項13記載の液化ガス再気化方法。 - 前記第1熱媒体との熱交換により気化させる前の液化ガスを、ガス需要先で要求される再気化ガスの圧力以上の圧力に加圧して前記第1熱媒体と熱交換させ、
前記再気化ガスが加熱されることで冷却された第2熱媒体の温度を測定し、測定した測定値に基づいて前記第1熱媒体と熱交換させる液化ガスの流量を制御する、請求項13記載の液化ガス再気化方法。 - 前記液化ガスを気化させることで凝縮された第1熱媒体をレシーバーに貯蔵し、前記熱源と熱交換させた後、前記液化ガスを気化させるために前記液化ガスと再び熱交換させて、
前記レシーバー内の圧力を測定した圧力測定値と、前記第2熱媒体と熱交換させる再気化ガスの温度を測定した温度測定値のうち、少なくとも1つ以上の測定値に基づいて、前記液化ガスと熱交換させずにレシーバーに供給する第1熱媒体の流量を制御する、請求項13記載の液化ガス再気化方法。
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