Method for producing liquid and gaseous oxygen by low temperature separation of air in air separation system in industrial application, involves feeding feed air flow to portion in mixed column and to another portion in separating column

摘要

The method involves providing a liquid product quantity in an operating mode to be smaller than another liquid product quantity in another operating mode, where the former quantity corresponds to 0% to 2% of a quantity of an oxygen-rich liquid fraction that is evaporated in a mixed column (M). A feed air flow is completely fed into the column. The latter quantity corresponds to 1% to 5% of the quantity of the evaporated oxygen-rich liquid fraction. The feed air flow is fed to a portion in the mixed column and to another portion in a separating column (S2). An independent claim is also included for an air separation system.