Experimental Study on Postcombustion Systems Including a Hollow Fiber Membrane and a Packed Column

Yanchi Jiang; Zhongxiao Zhang; Junjie Fan; Liu Yang; Jian Liu

doi:10.1021/acsomega.0c02251

Experimental Study on Postcombustion Systems Including a Hollow Fiber Membrane and a Packed Column

ACS Omega. 2020 Jul 7;5(28):17692-17702. doi: 10.1021/acsomega.0c02251. eCollection 2020 Jul 21.

Authors

Yanchi Jiang¹, Zhongxiao Zhang¹, Junjie Fan², Liu Yang¹, Jian Liu¹

Affiliations

¹ Shanghai Jiao Tong University, 800 Dongchuan RD, Shanghai 200240, China.
² University of Shanghai for Science and Technology, 516 Jungong RD, Shanghai 200093, China.

Abstract

In this work, a comprehensive lab-scale carbon capture installation was established to study the separation performances of CO₂/N₂ systems for the postcombustion technology. Four kinds of mono-/two-stage carbon capture methods containing membrane separation and chemical absorption processes were investigated. The result shows that the CO₂ capture performance of the one-stage membrane separation method (Memb) exhibits a profitable CO₂ removal efficiency but defective CO₂ concentration, while the one-stage chemical absorption method (Chem) indicates both CO₂ removal efficiency and CO₂ purity of more than 95.0% but suffers a regeneration heat of at least 2.7 MJ/t CO₂. The CO₂ purity of the two-stage membrane separation method (Memb-Memb) is 46.2% higher than the Memb method because of the additional membrane pretreatment. Two-stage methods have a superior gas recovery efficiency of over 99.0%, which is dramatically higher than the homogeneous Memb method. In addition, the investigation on the hybrid chemical absorption-membrane separation method (Memb-Chem) provides an alternative approach to reduce the mass transfer and solve the problems caused by an unequal mass flow distribution.