| 摘要 |
PROBLEM TO BE SOLVED: To provide an air liquefying and separating device and its method, producing a reduction in required power by effectively combining a multiple fractioning column and a dephlegmator. SOLUTION: The air liquefying and separating device comprises the multiple fractioning column 14 consisting of a high pressure fractioning column 11, a low pressure fractioning column 12 and a main condensing evaporator 13, the dephlegmator 15 having an oxygen chamber 17 for introducing low purity liquefied oxygen extracted from the low pressure fractioning column 12 and an air chamber 18 for introducing part of raw material air for fractioning the low purity liquefied oxygen while making heat exchange between the air chamber and the oxygen chamber to create liquefied oxygen at the lower part of the oxygen chamber, a reboiler 16 for gasifying the liquefied oxygen extracted from the lower part of the oxygen chamber using part of the raw material air as a heat source, and a passage from which oxygen gas gasified by the reboiler is sampled as product oxygen gas. COPYRIGHT: (C)2004,JPO&NCIPI
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