AIR SEPARATION METHOD AND APPARATUS
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United States of America Patent
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Issued Date -
Apr 24, 2014
app pub date -
Jun 13, 2012
filing date -
Jun 28, 2011
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Abandoned
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Abstract
Provided is an air separation method and apparatus in which consumed power source can be reduced when oxygen is collected in a three-column process, including: a first separation step in which feed air is separated into high pressure nitrogen gas and high pressure oxygen-enriched liquid air; a second separation step in which a high pressure oxygen-enriched liquid air is separated into medium pressure nitrogen gas, and medium pressure oxygen-enriched liquid air; a first indirect heat exchange step in which a medium pressure nitrogen gas is condensed and a low pressure oxygen-enriched liquid air is vaporized by indirect heat exchange; and a third separation step in which a low pressure oxygen-enriched air is separated into low pressure nitrogen gas and low pressure liquid oxygen.
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