| 摘要 |
An air-rectification system comprises a two-stage low-temperature separation column of the LINDE-FRANKL type connected to a heat exchanger whereby air is cooled on passage through the heat exchanger and is introduced into the high-pressure stage of the column, oxygen and nitrogen are fed from the high-pressure stage to a low-pressure stage of the column and are separated therein to form low-temperature product oxygen and nitrogen which are warmed by passage separately through the heat exchanger, and a gas stream, representing a heat-balancing stream (balance stream) is drawn from the rectification column and passed through the heat exchanger, in which one of the gas streams between the heat exchanger and the rectification column is subject to low-temperature compression. The compressed gas stream may be the balance gas stream, the incoming air after cooling in the heat exchanger or one of the product gas streams.
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