CO_2 SOLUBILITY ENHANCEMENT IN NANOFLUIDS BY AL_2O_3 NANOPARTICLES

摘要

Recently,many studies have been focused on the reduction of CO_2 emissions, which is a main greenhouse gas. But, the temperature of absorbent during the physical absorption process should be maintained at a low temperature (about -40℃) to increase the CO_2 gas absorption rate according to the Henry's solubility law. Therefore, huge amount of energy is required to keep such a low temperature of the absorbent in the CO_2 removal systems. In this study, Al_2O_3 nanoparticles are combined into NaCl aqueous solution to enhance the CO_2 mass transfer of the base fluid (NaCl aqueous solution). The absorption experiments are carried out in a bubble type absorber system. The nanoparticle concentration ranges from 0.005 to 0.1 vol%. It is found that the CO_2 solubility is enhanced up to 12.5% at 0.01 vol% of Al_2O_3/NaCl aqueous solution nanofluids. The nanofluid proposed in the present study is expected to be a promising candidate for removing the CO_2 gas.