Air separable device and its cold energy utilization manner null for gas product

摘要

PROBLEM TO BE SOLVED: To provide an air separator for a gas product in which cold heat of LNG can be utilized effectively. ;SOLUTION: In an air separator comprising a means for supplying material air, a main heat exchanger, a rectifying column for separating the components and an LNG heat exchanger, and in its cold heat utilizing method, a gas product taken out from the rectifying column is heated by the main heat exchanger, nitrogen gas in the gas product is passed through the LNG heat exchanger in order to recover cold head and then passed again through the main heat exchanger in order to exchange heat thus producing a gas product. High purity nitrogen gas or nitrogen gas having a low content of oxygen is passed through the LNG heat exchanger and the pressure thereof is preferably higher than that of LNG.;COPYRIGHT: (C)2003,JPO