| 摘要 |
Variable production of compressed oxygen by means of low-temperature separation of air in a distillation column system having a high-pressure column and a low-pressure column. In a first operating mode, a first total air quantity is cooled in the main heat exchanger, and a first turbine amount is fed to the expansion to perform work. In a second operating mode, a second oxygen stream from an external source outside the distillation column system is introduced into the low-pressure column in a liquid state. There is less total air cooled in the main heat exchanger, and less air is fed to the expansion to perform work than in the first, operating mode. |
| 主权项 |
1. A method for producing gaseous compressed oxygen having variable power consumption by low temperature separation of air in a distillation column system that has a high-pressure column and a low-pressure column, in which
feed air in the form of a total air stream is cooled in a main heat exchanger, at least a part, of the cooled feed air is introduced into the high-pressure column, a first oxygen stream from the low-pressure column is pressurized in the liquid state, the pressurized first oxygen stream is vaporized or pseudo-vaporized and warmed in the main heat exchanger, the warmed first oxygen stream is obtained as a gaseous compressed oxygen product, a first substream of the feed air, before entry thereof into the main heat exchanger, is brought to a first high pressure which is at least 4 bar higher than the operating pressure of the high-pressure column, the first substream is liquefied or pseudo-liquefied at the first high pressure in the main heat exchanger and subsequently introduced into the distillation column system, a second substream of the feed air is brought to a second high pressure that is at least 4 bar higher than the operating pressure of the high-pressure column, the second substream is cooled in the main heat exchanger only to an intermediate temperature, the second substream that is cooled to the intermediate temperature is work-producingly expanded and subsequently introduced into the distillation column system, wherein, in a first mode of operation
a first total air amount is cooled in the main beat exchanger,a first turbine amount, as first substream, is fed to the work-producing expansion, and, wherein in a second mode of operation
a second total air amount is cooled in the main beat exchanger, which second total air amount is less than the first total air amount of,a second turbine amount is fed as second substream to the work-producing expansion which second turbine amount is less than the first turbine amount characterised in that in the second mode of operation, a second oxygen stream is introduced from an external source outside the distillation column system into the low-pressure column in the liquid state and in the first mode of operation, the first and second substreams are together boosted in a pair of parallel-connected boosters. |
