Air separation apparatus for cold box, has liquid supplying unit supplying liquid from head of medium-pressure column to subcooler and elongated shape member, and gas supplying unit supplying gas from head of member to subcooler

摘要

The apparatus has an air supplying unit (11) supplying air from a main exchange line to a medium-pressure column (1). A liquid supplying unit supplies liquid from a tank (13) of an elongated shape member (B) to a head of an auxiliary column (2). The liquid supplying unit supplies the liquid from the tank of the column (1) to a subcooler (6) and the member (B). The liquid supplying unit supplies the liquid from the head of the column (1) to the subcooler and the member (B). A gas supplying unit supplies gas (15) from the head of the member (B) to the subcooler.