| 摘要 |
PROBLEM TO BE SOLVED: To provide an air separation method and apparatus capable of further improving air separation efficiency in AB processing and reducing more power cost. ! SOLUTION: An air separation method for collecting product oxygen through cryogenic liquefaction/separation of compressed, refined and cooled raw material air includes: a first distillation step of separating into first nitrogen gas and oxygen enriched liquid; a second distillation step of separating into second nitrogen gas and liquefied oxygen; a first indirect heat exchange step of indirect heat exchanging the first nitrogen gas and part of the liquefied oxygen; a second indirect heat exchange step of indirect heat exchanging low-temperature compressed second raw material air and the remaining of the liquefied oxygen; and a third indirect heat exchange step of decompressing third liquefied air to an intermediate pressure followed by indirect heat exchanging for third nitrogen gas. ! COPYRIGHT: (C)2015,JPO&INPIT |
