| 摘要 |
A process and apparatus for the low-temperature separation of air with variable oxygen production are described. Compressed, pre-purified and cool air (line 5) is pre-separated in the pressure stage 10 of a two-stage rectification 9. The bottom liquid thus formed is further separated in the low-pressure stage 11. Liquid nitrogen 14 from the pressure stage 10 and liquid oxygen from the low-pressure stage 11 can be temporarily stored in tanks 35, 32. In addition, a liquid-air tank 14 is provided for storing bottom liquid 12 from the pressure stage 10. If the production of oxygen is increased, the throughput in the pressure stage 10 can be increased and at the same time the throughput in the low-pressure stage 11 and the reflux ratios in the two rectification stages 10, 11 can be kept constant. |
