CO_2 ABSORPTION/DESORPTION PERFORMANCE ENHANCEMENT BY NANOABSORBENTS

摘要

Experiments on CO_2 absorption were carried out in Taylor-Couette type absorber at low rotational speeds. The base absorbent used is methanol. Al_2O_3 and SiO_2 nanoparticles are combined with methanol to produce nanoabsorbents with the purpose of enhancing the absorption of the CO_2 gas. The system is equipped with a mass flow controller at the inlet and a mass flow meter at the outlet to obtain the absorption rate. The Taylor-Couette absorber performance is compared to a modified version in which trays were added to enhance the absorption rate by increasing the residence time of the gas phase. Experiments in co-current and counter-current flow modes are carried out. It is found that the CO_2 absorption rate enhances up to 6% and 8%, respectively, by using SiO_2 and Al_2O_3 nanoparticles. In addition, the two-phase flow pattern of the CO_2 gas bubbles and the liquid methanol in the Taylor-Couette absorber and the modified version is analyzed with the high-speed camera pictures.