Using hollow fiber membrane contactor for CO2 capture b γ-Al2O3 nanofluid
Paper ID : 1383-MST2015-FULL
Authors:
Ahmad Moheb *1, Majid Ansaripour2, Masoud Haghshenasfard2
1Department of Chemical Engineering, Isfahan University of Technology, Isfahan, 84156983111, IRAN
2Isfahan University of Technology
Abstract:
Different methods such as gas absorption in packed or tray columns are widely used for CO2 capture. Due to the operating problems and relatively low efficiency of the conventional absorption systems, new devices such as gas-liquid hollow fiber membrane contactors are considered as alternative methods. In this work, γ-alumina/water nanofluid was used in gas-liquid hollow fiber membrane for CO2 removal from CO2/N2 mixtures. Effect of different parameters on absorption efficiency such as concentration of nanoparticles in base fluid, gas and liquid flow rates and concentration of CO2 in feed were investigated. The membrane contactor used in this work was a dialysis hollow fiber membrane cell with polysulfone fibers. Also γ -alumina (dp =10-20 nm) was dispersed in deionized water to prepare nanofluids as absorbing solution with different concentrations of 0.005, 0.01, and 0.02 vol %.
Experimental results showed that by increasing the nanoparticle concentration, mass transfer efficiency and therefore CO2 removal rate increased. For instance, by using of 0.02 vol. % γ -alumina nanofluid, CO2 removal efficiency in low gas flow rates reached to 92%.
On the other hand, by using 0.02 vol. % γ -alumina nanofluid, removal efficiency becomes about 70% at high solvent flow rates. By increasing solvent flow rate, mass transfer resistance in liquid phase reduced and this led to increase in the removal efficiency.
Keywords:
CO2 absorption; membrane contactor; γ -alumina nanofluid; removal efficiency; mass transfer coefficient.
Status : Paper Accepted (Poster Presentation)