Carbon dioxide absorption and anti-clogging performance of a novel millimeter-scale channel absorber.

Qiao, Zihao; Chen, Zezhi; Gong, Huijuan; Wang, Yu; Yu, Huiqiang; Chen, Lu

This study proposes a novel millimeter-scale channel absorber for the first time, which involves carbon dioxide (CO 2) absorption in the channel to achieve efficient CO 2 absorption while avoiding clogging. CO 2 absorption experiments were conducted on such a channel absorber with an inner diameter of 2.3 mm to study its CO 2 mass transfer and absorption characteristics. Al 2 O 3 particles were introduced as solid impurities to evaluate its anti-clogging performance. The experimental results showed that a stable Taylor flow could be formed in the channel in appropriate gas and liquid flowrate ranges. The liquid-side volume mass transfer coefficient (K L a) reached 0.34 s−1 using a 6% DEA solution as the absorbent, which was approximately one order of magnitude higher than that of the conventional packed towers. When Al 2 O 3 to a maximum extent of 2 wt% was added into the absorbents, no clogging was observed, and the values of K L a even increased. Due to the excellent CO 2 absorption mass transfer and anti-clogging performance, millimeter channel absorbers have promising industrial applications for CO 2 absorption. Therefore, means and application scenario for applying millimeter-scale channel absorber in the industrial CO 2 absorption have been proposed. [Display omitted] ● A millimeter-scale channel absorber is proposed for CO 2 absorption. ● Taylor flow formed in the millimeter-scale channel under appropriate flow conditions. ● The liquid-side volume mass transfer coefficient (K L a) reached 0.34 s−1. ● The millimeter-scale channel absorber showed excellent anti-clogging performance. ● A correlation equation was established for the K L a in this channel absorber.

CARBON dioxide adsorption; CARBON dioxide; MASS transfer coefficients; MASS transfer; ALUMINUM oxide; ABSORPTION

Chemical Engineering Research & Design: Transactions of the Institution of Chemical Engineers Part A, 2023, Vol 200, p169

0263-8762

Academic Journal

10.1016/j.cherd.2023.10.047