Enhancement of CO2 Absorption under Taylor Flow in the Presence of Fine Particles

doi:10.1016/S1004-9541(13)60451-6

Abstract

Abstract: The physical absorption of CO₂ in water containing different types of particles was studied in a microchannel operated under Taylor flow. The maximum enhancement factors of 1.43-2.15 were measured for activated carbon (AcC) particles. The analysis shows that the enhancement effect can be attributed to the shuttle mechanism. Considering the separate contributions of mass transfer from bubble cap and liquid film, a heterogeneous enhancement model is developed. According to this model, the enhancement factors E_Cap, E_Film and E_Ov are mainly determined by mass transfer coefficient K_L (K_L,Cap and K_L,Film), adsorptive capacity of particles m, and coverage fraction of particles at gas-liquid interface ζ. With both effects of particle-to-interface adhesion and apparent viscosity included, the model predicts the enhancement effect of AcC particles reasonably well.

Key words: enhancement factor, gas-liquid mass transfer, adsorptive particle, Taylor flow, microchannel

摘要： The physical absorption of CO₂ in water containing different types of particles was studied in a microchannel operated under Taylor flow. The maximum enhancement factors of 1.43-2.15 were measured for activated carbon (AcC) particles. The analysis shows that the enhancement effect can be attributed to the shuttle mechanism. Considering the separate contributions of mass transfer from bubble cap and liquid film, a heterogeneous enhancement model is developed. According to this model, the enhancement factors E_Cap, E_Film and E_Ov are mainly determined by mass transfer coefficient K_L (K_L,Cap and K_L,Film), adsorptive capacity of particles m, and coverage fraction of particles at gas-liquid interface ζ. With both effects of particle-to-interface adhesion and apparent viscosity included, the model predicts the enhancement effect of AcC particles reasonably well.

关键词: enhancement factor, gas-liquid mass transfer, adsorptive particle, Taylor flow, microchannel

CAI Wangfeng, ZHANG Jiao, ZHANG Xubin, WANG Yan, QI Xiangjuan. Enhancement of CO₂ Absorption under Taylor Flow in the Presence of Fine Particles[J]. Chin.J.Chem.Eng., 2013, 21(2): 135-143.

蔡旺锋, 张娇, 张旭斌, 王燕, 齐向娟. Enhancement of CO₂ Absorption under Taylor Flow in the Presence of Fine Particles[J]. Chinese Journal of Chemical Engineering, 2013, 21(2): 135-143.

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Enhancement of CO₂ Absorption under Taylor Flow in the Presence of Fine Particles

Enhancement of CO₂ Absorption under Taylor Flow in the Presence of Fine Particles

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