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    • 3. 发明申请
    • METHOD AND APPARATUS FOR COOLING AND/OR LIQUEFYING A HYDROCARBON STREAM
    • 用于冷却和/或液化烃流的方法和装置
    • WO2009071538A3
    • 2010-03-11
    • PCT/EP2008066623
    • 2008-12-02
    • SHELL INT RESEARCHCHANTANT FRANCOISPOH CHUN KIT
    • CHANTANT FRANCOISPOH CHUN KIT
    • F25J1/02F25B1/10
    • F25J1/0052F25B1/10F25B5/04F25B2400/13F25J1/0022F25J1/0087F25J1/0294
    • A refrigerant stream (10) is provided at a refrigerant pressure, and passed through at least three heat exchange steps (12, 14, 16, 18) operating at different pressure levels. A hydrocarbon stream (20) is passed through at least two of these heat exchange steps to provide a cooled hydrocarbon stream (30). A fraction of the refrigerant stream (10) is expanded and evaporated at each heat exchange step (12, 14, 16, 18) to a different pressure, to provide a first evaporated refrigerant stream (40) at a first evaporation pressure, and at least two other evaporated refrigerant streams (50, 60, 70) at evaporation pressures lower than the first evaporation pressure. The first evaporated refrigerant stream (40) is compressed through a highest-pressure compressor stage (22) to provide at least a fraction of the refrigerant stream (10) at the refrigerant pressure, and the other evaporated refrigerant streams (50, 60, 70) are compressed through at least two parallel lower pressure compressor stages (24, 26, 28) to provide two or more part-compressed refrigerant streams (50a, 60a, 70a), all of which part-compressed refrigerant streams (50a, 60a, 70a) being passed through the highest pressure compressor stage (22).
    • 制冷剂流(10)以制冷剂压力提供,并且通过在不同压力水平下操作的至少三个热交换步骤(12,14,16,18)。 烃流(20)通过这些热交换步骤中的至少两个以提供冷却的烃流(30)。 一部分制冷剂流(10)在每个热交换步骤(12,14,16,18)处被膨胀和蒸发到不同的压力,以在第一蒸发压力下提供第一蒸发的制冷剂流(40) 至少两个蒸发的制冷剂流(50,60,70),其蒸发压力低于第一蒸发压力。 第一蒸发的制冷剂流(40)通过最高压力的压缩机级(22)被压缩,以在制冷剂压力下提供至少一部分制冷剂流(10),另一个蒸发的制冷剂流(50,60,70 )通过至少两个平行的低压压缩机级(24,26,28)压缩,以提供两个或更多个部分压缩的制冷剂流(50a,60a,70a),所有这些部分压缩的制冷剂流(50a,60a,70a) 70a)通过最高压力的压缩机级(22)。