| 摘要 |
Method of liquefying a hydrocarbon stream such as natural gas from a feed stream (10), the method at least comprising the steps of: (a) passing the feed stream (10) through a first cooling stage (100a, 100b) having at least two heat exchangers (112) and against a first single component refrigerant in a first refrigerant circuit (110a, 110b), to provide a cooled hydrocarbon stream (30); (b) passing the cooled hydrocarbon stream (30) through a second cooling stage (200) against a second refrigerant in a second refrigerant circuit (210a, 210b), to provide a liquefied hydrocarbon stream (40); (c) passing the second refrigerant through one or more of the heat exchangers (112) of the first cooling stage (100a, 110b); wherein the heat exchangers of the first cooling stage (100a, 100b) are shell and tube heat exchangers (112) having two or more tube circuits, the feed stream (10) passing through the tube circuit in each shell and tube heat exchanger (112) and the second refrigerant passing through another tube circuit in each shell and tube heat exchanger (112), and wherein the first refrigerant passes through the shell and tube heat exchangers (112) around the feed stream (10) and second refrigerant; and wherein the first refrigerant circuit (110a, 110b) includes one or more refrigerant compressors (114) and the second refrigerant circuit (210a, 210b) includes one or more refrigerant compressors (122), and wherein at least one refrigerant compressor (114) of the first refrigerant circuit (110a, 110b) and at least one refrigerant compressor (122) of the second refrigerant circuit (210a, 210b) are mechanically interconnected and are arranged to be driven by a common driver (116).
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