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    LNG production using dual independent expander refrigeration cycles
    6.
    发明公开
    LNG production using dual independent expander refrigeration cycles 审中-公开
    使用双独立膨胀机制冷循环的LNG生产

    公开(公告)号：EP2447652A2

    公开(公告)日：2012-05-02

    申请号：EP12152549.7

    申请日：2002-03-06

    申请人： Lummus Technology Inc.

    发明人： Foglietta, Jorge H.

    IPC分类号： F25J3/02 ,  F25J1/02 ,  F25J1/00

    CPC分类号： F25J1/0072 ,  F25J1/0022 ,  F25J1/0037 ,  F25J1/0042 ,  F25J1/005 ,  F25J1/0052 ,  F25J1/0082 ,  F25J1/0205 ,  F25J1/0208 ,  F25J1/021 ,  F25J2220/62 ,  F25J2270/90

    摘要： A process for producing a liquefied natural gas stream from an inlet gas feed stream, the process comprising the steps of:
    cooling at least a portion of the inlet gas feed stream by heat exchange contact with a first gas-phase refrigerant in a methane refrigeration cycle operated independently of a second gas-phase refrigerant in a nitrogen refrigeration cycle;
    the methane refrigeration cycle comprising the steps of:
    expanding a first gas-phase refrigerant comprising methane to form a cold methane vapour steam;
    cooling at least a portion of the inlet feed gas stream by heat exchange contact with the cold refrigerant vapour stream;
    compressing the cold methane vapour stream to form a compressed methane vapour stream; and
    cooling at least a portion of the compressed methane vapour stream by heat exchange contact with the cold methane vapour stream; and
    the nitrogen refrigeration cycle comprising the steps of:

    expanding a second gas-phase refrigerant comprising nitrogen to a cold nitrogen vapour stream;
    cooling at least a portion of the inlet feed gas stream by heat exchange contact with the cold nitrogen vapour stream simultaneously as cooling at least a portion of the inlet feed gas stream by heat exchange contact with the cold methane vapour stream;
    compressing the cold nitrogen vapour stream to form a compressed nitrogen vapour stream; and
    cooling at least a portion of the compressed nitrogen vapour stream by heat exchange contact with the cold nitrogen vapour stream;
    whereby a liquefied natural gas stream is produced.

    摘要翻译： 一种由入口气体进料流生产液化天然气流的方法，该方法包括以下步骤：通过在甲烷制冷循环中与第一气相制冷剂进行热交换接触来冷却至少一部分入口气体进料流 在氮气制冷循环中独立于第二气相制冷剂运行; 所述甲烷制冷循环包括以下步骤：使包含甲烷的第一气相制冷剂膨胀以形成冷甲烷蒸气; 通过与冷的制冷剂蒸气流的热交换接触来冷却入口进料气流的至少一部分; 压缩冷的甲烷蒸气流以形成压缩的甲烷蒸气流; 以及通过与冷的甲烷蒸气流进行热交换接触来冷却至少一部分压缩的甲烷蒸气流; 以及所述氮制冷循环包括以下步骤：将包含氮的第二气相制冷剂膨胀成冷氮气流; 通过与冷的氮蒸气流进行热交换接触同时冷却至少一部分入口进料气流，同时通过与冷的甲烷蒸气流的热交换接触冷却入口进料气流的至少一部分; 压缩冷的氮蒸气流以形成压缩的氮蒸气流; 以及通过与所述冷氮蒸气流进行热交换接触来冷却所述压缩氮蒸气流的至少一部分; 由此产生液化天然气流。