OFF-GAS FEED METHOD AND OBJECT GAS PURIFICATION SYSTEM

摘要

An off-gas feed method for feeding off-gas discharged from adsorption towers (A, B, C) to an off-gas consuming unit (1), comprising the step of concentrating and separating object gas from mixed gas by the plurality of adsorption towers (A, B, C) filled with adsorbent by utilizing a pressure swing adsorption method in which cycles having a plurality of steps are repeatedly performed, whereby the off-gas can be fed, without interruption, to the off-gas consuming unit (1) by discharging the off-gas from at least one of the adsorption towers (A, B, C) in all steps forming the cycles.