| 摘要 |
The invention relates a method for supplying highly pure oxygen by cryogenic distillation of air from an installation comprising a first (1) and a second (2) air separating apparatus. According to the invention: the first air separating apparatus has a medium pressure column, a low pressure column thermally connected to the medium pressure column, and has a mixing column in which air to be distilled is fed to the medium pressure column; liquids enriched with oxygen and with nitrogen are fed from the medium pressure column to the low pressure column; according to a first operation of the apparatus, a flow of oxygen-enriched liquid coming from the low pressure column is fed to the top of the mixing column; a flow of low-purity oxygen is drawn off from the top of the mixing column and at least a portion ( 3 ) thereof is fed to a first consumer unit ( 5 ), and; the second apparatus ( 2 ) supplies highly pure oxygen ( 8 ) to a second consumer unit ( 9 ), whereas according to a second operation, the flow of low-purity oxygen drawn off from the top of the mixing column is reduced in the first apparatus; a flow of highly pure oxygen is drawn off from the vessel of the low pressure column of the first apparatus and is fed ( 11 ) to at least the second consumer unit ( 9 ), and; the second apparatus ( 2 ) does not supply highly pure oxygen to the second consumer unit.
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