| 摘要 |
<p>A first stream of compressed, purified, air is cooled in a main heat exchanger 8 and is introduced for separation into the bottom of a higher pressure rectification column 16 forming part of a double rectification column 14. A stream of oxygen-enriched liquid air is at least partially vaporised in a further heat exchanger 26, is warmed in the main heat exchanger 8, is expanded in an expansion turbine 38, as is introduced through an inlet 40 into the lower pressure rectification column 18 of the double rectification column 14. The partial vaporisation of the stream of oxygen-enriched liquid air is effected by indirect heat exchange with a second stream of compressed purified air this second stream being condensed thereby. A stream of the resultant condensate is introduced into an intermediate region of the higher pressure rectification column 16.</p> |
