| 摘要 |
In low-temperature air fractionation, feed air (8) is cooled in a main heat exchanger (9) and introduced into a distillation column system for nitrogen-oxygen separation (11, 43), which system has at least one single column (12). At least one nitrogen-enriched or oxygen-enriched product stream (15, 16, 17; 53; 51, 56, 57; 19, 60) is withdrawn from the distillation column system for nitrogen-oxygen separation and warmed in the main heat exchanger (9). A fluid from an external source is passed at least at times into a liquid tank (70). At least at times fluid (71) is withdrawn in the liquid state from the liquid tank (70), vaporized in the main heat exchanger (9) and is obtained as gaseous additional product (72, 73).
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