Method and apparatus for cooling a stream, in particular a hydrocarbon stream such as natural gas
    1.
    发明公开
    Method and apparatus for cooling a stream, in particular a hydrocarbon stream such as natural gas 审中-公开
    用于冷却流,尤其是富含烃的流,如方法和装置例如 天然气

    公开(公告)号:EP1790926A1

    公开(公告)日:2007-05-30

    申请号:EP06124522.1

    申请日:2006-11-22

    IPC分类号: F25J1/02 F25B1/053 F25B1/10

    摘要: The present invention provides a method and apparatus (1) for producing a liquefied natural gas stream (100), wherein a natural gas stream (10) is cooled in a heat exchanger (2) against a refrigerant fluid being cycled in a refrigerant circuit (3). The cycling of the refrigerant fluid comprises:
    (a) feeding a first refrigerant fluid (20) into an axial compressor (5); (b) compressing the first refrigerant fluid (20) in the axial compressor (5), thereby obtaining a compressed first refrigerant fluid (30); (c) feeding the compressed first refrigerant fluid (30) at a first pressure level into a centrifugal compressor (6); (d) feeding a second refrigerant fluid (40) at a second pressure level being lower than the first pressure level into the centrifugal compressor (6); (e) compressing the compressed first refrigerant fluid (30) and the second refrigerant fluid (40) in the centrifugal compressor (6), thereby obtaining a compressed refrigerant fluid mixture (50); (f) cooling the compressed refrigerant fluid mixture (50) in a heat exchanger (13), thereby obtaining a cooled compressed refrigerant fluid mixture (60); (g) separating the cooled compressed refrigerant fluid mixture (60) into at least two streams; (h) evaporating the two streams obtained in step (g) at different locations of a heat exchanger (2) in heat exchanging contact with the natural gas stream (10) to be cooled; and (i) retrieving the first and second refrigerant fluids (20,40) from the two streams evaporated in step (h).

    摘要翻译: 本发明提供了一种方法和(设备(1)用于生产液化天然气流(100)worin天然气流(10)在热交换器(2)对制冷剂流体冷却开始循环中的制冷剂回路 3)。 制冷剂流体的循环包括:(a)将第一制冷剂流体(20)成轴向压缩机(5); (b)压缩在轴向压缩机,第一制冷剂流体(20)(5),从而获得压缩的第一制冷剂流体(30); (C)在供给第一压力水平的第一压缩制冷剂流体(30)到一个离心式压缩机(6); (D)在第二压力水平进给第二制冷剂流体(40)比所述第一压力水平到所述离心式压缩机(6)的下部; (E)压缩压缩的第一制冷剂流体(30)和在所述离心式压缩机的第二制冷剂流体(40)(6),从而获得压缩的制冷剂流体混合物(50); (F)在热交换器(13)冷却所述压缩的制冷剂流体混合物(50),从而获得冷却的压缩的制冷剂流体混合物(60); (G)的冷却的压缩的制冷剂流体混合物(60)分离成至少两股流; (H)蒸发在与天然气流(10)的热交换接触的热交换器(2)的不同位置在步骤(g)中获得的两个流被冷却; 和(i)中检索从在步骤(h)蒸发两个流,第一和第二制冷剂流体(20,40)。