APPARATUS AND METHOD FOR SEPARATING AIR BY CRYOGENIC DISTILLATION

摘要

The invention relates to equipment for separating air that includes a first average pressure distillation column (1), a second low-pressure distillation column (2), a third low-pressure distillation column (3), a first condenser-vaporizer (9, 9A), a second condenser-vaporizer (5) arranged in the tank of the second column, a pipe (33) for supplying air to the first column, a pipe (35) for supplying a nitrogen-enriched liquid from the head of the first column to the head of the third column, at least one pipe (23) for supplying the liquid from the tank of the third column to the first condenser-vaporizer, a pipe (25) for supplying a liquid of the tank from the first column to the third column, a pipe (21) for supplying the liquid from the first condenser-vaporizer to the second column, a pipe (15, 19) for supplying gas from the head of the second column to the tank of the third column, wherein the first, second, and third columns are arranged side by side.