| 摘要 |
Oxygen and nitrogen are produced by the fractionated cryogenic distillation of air (1, 5, 7) in a rectification system with a distillation column (8). Oxygen and nitrogen are produced by the fractionated cryogenic distillation of air (1, 5, 7) in a rectification system with a distillation column (8). An oxygen-rich liquid fraction (9) is drawn from the column (8) base and surrendered to a condenser evaporation chamber (12), releasing an oxygen-rich gas fraction (20). Gaseous nitrogen (13) from the distillation column (8) is surrendered to and condensed (14) in the head condenser (12). A first fraction of the liquid nitrogen (14) is drained and returned in part to the distillation column (8). A second fraction (16) is pressurized (18) and evaporated (6) by a hot body (28, 228, 338, 429) for surrender as pressurized nitrogen (19). A return fraction (22, 27, 28, 29, 31) formed by the a first part (22, 221) of the oxygen-enriched fraction (20), is compressed (25) and released (28, 31) into the lower part of the distillation column (8).
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