| 摘要 |
PURPOSE: To insure a cryogenic air separation system which reduces or eliminates necessity for compressing product gas by producing pressurized product gas. CONSTITUTION: Feed air 100 compressed to a pressure within a range of from 90 to 500 pound per absolute square inch (psia) is cooled with indirect heat exchange with respect to a flow passing through a heat exchanger 101. A cooled and compressed feed air portion 103 is provided to a turboexpander 102 and is turboexpanded to a pressure generally ranging from 60 to 100 psia. Turboexpanded air 104 is introduced into a first tower 105. A cooled and compressed feed air portion 106 is provided to a condenser 107 where it is at least partly condensed through indirect heat exchange with oxygen-rich liquid evaporated from an air separation plant, and resulting liquid is introduced into the first tower 105 from an upper portion of a vapor feed position.
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