CO_2 absorption enhancement by Al_2O_3 nanoparticles in NaCl aqueous solution

摘要

In this study, Al_2O_3 nanoparticles and NaCl aqueous solution are combined into Al_2O_3/NaCl aqueous solution nanofluids to enhance the CO_2 absorption of the base fluid (NaCl aqueous solution). The absorption experiments are carried out in the bubble type absorber system. The particle concentration ranges from 0.005 to 0.1 vol%. It is found that the optimum concentration of AI2O3 nanoparticles is 0.01 vol% in the NaCl aqueous solution-based nanofluids and then CO_2 solubility is enhanced to 11.0%, 12.5% and 8.7% for Al_2O_3/NaCl aqueous solution at 30℃, 20℃ and 10℃, respectively. It is concluded that the effect of nanoparticles on the mass transfer enhancement is more significant in the region of un-saturated state than that of the saturated state.