Absorption of Carbon Dioxide by Lime Water Spray

Abstract

Experimental studies of gas absorption were carried out for carbon dioxide-air-aqueous calcium hydroxide solution system using a small spray column over a wide range of mass flow rates of liquid L=3-8×10^-3kg/s, mass flow rates of carbon dioxide-air mixtures G=0.5-2.0×10^-3kg/s, and feed gas concentrations y=0.1-1.0. Observed data for the dimensionless rate of absorption of carbon dioxide showed good agreement with the one predicted by a solid sphere penetration model with second order irreversible chemical reaction for feed gas concentration y_??_0.2. The systematic deviation from the predicted one became considerable with increasing feed gas concentration and Fourier number. This may be due to the formation of calcium carbonate precipitate near the gas-liquid interface of the spray drops.