| 摘要 |
<p>The nitrogen production column (4) comprises, below the air injection point, an oxygen enrichment section (17, 18) and a tank reboiler (9) fed with recycled high-pressure nitrogen. The liquid decompressed (in 19) to feed the head condenser (8) is drawn off at an intermediate level between the air entry level and the reboiler, and the liquid from the column tank, after vaporisation, constitutes a minor product of the plant, consisting essentially of oxygen. <IMAGE></p> |
