Consideration for H₂O-PSA Placed in Front of System of CO₂ Separation from Flue Gas

Abstract

The performance of H₂O-PSA with Zeolite 3A as adsorbent was examined for the dehumidifing of flue gas at the first stage of a CO₂ separation system with CO₂-PSA and cryogenic separation. Zeolite 3A displaced with K⁺ at the site of the hydrogen ion has shown performance higher than active alumina with respect to the decrease in loss of CO₂ in flue gas through H₂O-PSA as well as the dehumidification of flue gas. In addition, it has been shown that there is a possibility of operating the H₂O-PSA with low power by applying the purge with off-gas from CO₂-PSA.