| 摘要 |
Air is compressed in a compressor 2, purified in a purification unit 4, cooled by passage through a main heat exchanger 6 and separated in a double rectification column 12 comprising a higher pressure rectification column 14 and a lower pressure rectification column 18. A stream of argon-enriched oxygen vapour is withdrawn from the lower pressure rectification column 18 through an outlet 39 and an argon product is separated from it in an argon rectification column 40 provided with an argon condenser 48. Argon is condensed in the condenser 48 by indirect heat exchange with a second stream of air at a pressure between the operating pressures of the columns 14 and 18. The second air stream is partially condensed and passed into a phase separator 60. A stream of liquid phase is withdrawn from the phase separator 60, is passed through a throttling valve 62 and the condenser 48, in sequence. Further cooling for the condenser 48 is thus provided. <IMAGE> |
