| 摘要 |
The present invention relates to a method of liquefying a hydrocarbon stream such as a natural gas stream, the method at least comprising the steps of : supplying a partly condensed feed stream (10) having a pressure above 60 bar to a first separator (2) wherein it is separated into a gaseous stream (20) and a liquid stream (30) ; expanding the liquid stream (30) and the gaseous stream (20) and subsequently feeding them into the distillation column (3) ; removing from the distillation column (3) a gaseous overhead stream (80), partially condensing it, feeding it (90) into a second separator (8) thereby obtaining a liquid stream (100) and a gaseous stream (110), feeding the liquid stream (100) into the distillation column (3) and liquefying the gaseous stream (110) thereby obtaining a liquefied stream (200) ; wherein the gaseous overhead stream (80) is partially condensed by heat exchanging against the expanded gaseous stream (60) before it (70) is fed into the distillation column (3) ; and wherein the gaseous stream (110) is removed from the second separator but before it (160) is liquefied, is heat exchanged against the feed stream (10a), thereby partially condensing the feed stream (10a). ® KIPO & WIPO 2009
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