Although the super cold separator applied to the system for CO2 recovery from flue gas can produce pure CO2 liquid, the CO2 recovery efficiency is low. Therefore, the addition of a PSA plant was considered for the secondary CO2 recovery from the noncondensing 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 CO2 could be concentrated from 50% in the noncondensing gas to 70% in the recovery gas by the PSA plant and the CO2 recovery efficiency of the plant was about 90%.