The invention relates to a method for air separation by cryogenic distillation in a column system that includes at least a first column (100) operating at a first pressure, and a second column (102) operating at a second pressure that is lower than the first pressure, the head of the first column being thermally connected to the tank of the second column via a vaporizer-condenser (21), a first portion of a nitrogen-enriched gas (17) is drawn from the head of the first column, compressed in a compressor (19) having an inlet temperature no higher than -150DEG C and condensed in the vaporizer-condenser, an oxygen-rich fluid (43) is drawn from the lower portion of the second column and heated in the exchange line, a nitrogen-rich gas (41) is drawn from the upper portion of the second column and heated in the exchange line, and a second portion of the nitrogen-enriched gas is expanded in a turbine without having been compressed.
Method and apparatus for air separation by cryogenic distillation
2015-07-01
Patent
Elektronische Ressource
Englisch
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