| 摘要 |
An air separator with which oxygen gas can be produced in an energy-saving manner and that enables a device to be remarkably downsized. The air separator has an air compressor (1) for taking in air from the outside and compressing it, first adsorption columns (2, 3) for condensing oxygen gas that is contained in the air compressed by the air compressor (1), an oxygen/air compressor (11) for further compressing high-density oxygen gas-containing compressed air (X) came through the first adsorption columns (2, 3), a main heat exchanger (21) for cooling a high-density oxygen-containing compressed air (Y) came through the oxygen/air compressor (11), and high-pressure rectification column (23) and a low-pressure rectification column (28) that are used for taking out oxygen gas by decomposing, using differences in boiling points of component gases, the high-density oxygen-containing compressed air (Y) having been cooled to a lower temperature through the main heat exchanger (21).
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