| 摘要 |
<p><P>PROBLEM TO BE SOLVED: To provide an improved method for separating air by low temperature distillation. <P>SOLUTION: The air is compressed to the first pressure in a compressor, cooled and refined, the air under the first pressure is compressed to the second pressure in the first and second booster compressors 11, 8, to be cooled thereafter in a heat exchanger 5, at least one part of the air under the second pressure fed to the heat exchanger is cooled to be liquefied and is fed to at least one column of a double column, at least one part of the air is compressed to intermediate pressure between the first pressure and the second pressure, in the first booster compressor, followed to be cooled, and is expanded in the first turbine 12 having the first inlet temperature, the first portion of the air expanded in the the first turbine is fed to a high-pressure column, the second portion of the air expanded in the the first turbine is fed to the heat exchanger to be heated, and the second portion of the heated air is expanded in the second turbine 9 and is returned to the heat exchanger to be heated further. <P>COPYRIGHT: (C)2007,JPO&INPIT</p> |
