Application of high‐pressure swing adsorption process for improvement of CO₂ recovery system from flue gas

Although the super cold separator applied to the system for CO 2 recovery from flue gas can produce pure CO 2 liquid, the CO 2 recovery efficiency is low. Therefore, the addition of a PSA plant was considered for the secondary CO 2 recovery from the noncon‐densing gas to improve the efficiency. The PSA plant was operated for adsorption at the same pressure as that of the super cold separator and for desorption at the atmospheric pressure. From both the simulation and the experimental data, it was confirmed that CO 2 could be concentrated from 50% in the noncondensing gas to 70% in the recovery gas by the PSA plant and the CO 2 recovery efficiency of the plant was about 90%.