| 摘要 |
<p>PROBLEM TO BE SOLVED: To provide a method and an apparatus for manufacturing oxygen capable of reducing the number of instruments required for manufacturing oxygen to also reduce the cost of installation, and of suppressing an increase of power of a whole process to also reduce the operation cost. SOLUTION: Part of compressed and refined feed air is further compressed, cooled, liquefied, and reduced in pressure, and is introduced into a single rectifier 34 while a remainder of the feed air is cooled and introduced into the single rectifier 34. A nitrogen rich fraction separated in the single rectifier 34 is derived, and a part thereof is taken out as a circulation fluid, and is compressed at a low temperature and introduced into a reboiler 35 to evaporate liquid at a bottom of the single rectifier 34 and hence produce rising gas as well as liquefy the circulation fluid. The liquefied circulation fluid is reduced in its pressure as a reflux fluid to the single rectifier 34. An oxygen fraction separated in the single rectifier 34 is derived as liquid and is evaporated and raised in temperature for recovery thereof.</p> |
