METHOD AND APPARATUS FOR SEPARATING NITROGEN-ENRICHED GAS

摘要

A method for separating nitrogen-enriched gas by a pressure swing adsorption system using an apparatus comprising a plurality of adsorption tanks, an equalizing tank and a product storage tank, the method comprising the steps of: (a) allowing a predetermined amount of highly pure nitrogen gas from the equalizing tank to flow to an outlet side of the adsorption tank which is in a regenerating process; (b) establishing a communication between outlet sides of the two adsorption tanks with an equalizing pipeline while opening inlet sides of the two adsorption tanks under normal pressure; and (c) following the step causing a certain amount of the highly pure nitrogen gas in the equalizing tank to flow in a reverse direction via the outlet side of the adsorption tank which is going to shift from the regenerating process to an adsorption one while supplying material gas via the inlet side thereof.