| 摘要 |
<p>Abstract Natural qas liquefaction A method is described for liquefying a hydrocarbon-rich feed fraction, preferably natural gas, against a nitrogen refrigeration cycle, wherein the feed fraction is cooled against 5 gaseous nitrogen that is to be warmed and the feed fraction is liquefied against liquid nitrogen that is to be vaporized. According to the invention - the feed fraction is cooled and liquefied in an at least three-stage heat-exchange 10 process (E1a - E1c), - wherein, in the first section of the heat-exchange process (E1a), the feed fraction (1) is cooled against superheated gaseous nitrogen (9) to the extent that an essentially complete separation (D2) of the relatively heavy components (2') is achievable, 15 - in the second section of the heat-exchange process (E1b), the feed fraction (2) freed from relatively heavy components is partially liquefied against gaseous nitrogen that is to be superheated (9), and - in the third section of the heat-exchange process (Elc), the feed fraction (2) is liquefied against nitrogen that is to be partially vaporized (8). co, w j. c o' 1~ (N w - (N) 0)0 (4D0</p> |
