Mg(OH)2 is an absorbent of CO2 capture with low regeneration energy cost potential, and in order to promote its application in CO2 capture field, research has been carried out. In packed tower using real flue gas, a series of experiments were conducted under different operating conditions to test the capture efficiency of CO2 by Mg(OH)2 slurry. The results showed that the packing types, nominal gas residence time and liquid/gas ratio had effect on the capture efficiency of CO2. Liquid phase mass transfer was not improved by increasing the nominal gas residence time, but it was enhanced by raising the liquid/gas ratio. Under the experimental conditions, the overall volumetric mass transfer coefficient of the Rasching rings, Pall rings and IMTP were 8.5×10-75.0×10-6, 1.8×10-64.0×10-6 and 1.9×10-72.9×10-6 mol/(m3·s·Pa), separately.
