Absorption of Sulfur Dioxide in Spray Column and Turbulent Contacting Absorbers.

摘要

The report gives results of an analysis of experimental data,from both small and large scale turbulent contacting absorbers (TCA) and spray columns used in the wet scrubbing of SO2from flue gases,to obtain gas film mass transfer coefficients and overall coefficients in the liquid film which includes chemical reaction in the liquid film. Recycled limestone,limestone-magnesium oxide,and lime scrubbing slurries were investigated. Gas film coefficients for the spray and TCA scrubbers were calculated from data on SO2scrubbing with sodium carbonate solutions. Overall mass transfer resistances in the liquid phase were correlated for both scrubbers in terms of the ratio of the gas film and liquid film mass transfer resistances. The ratio of the resistances was found to be a function of only the scrubber type,inlet SO2partial pressure in the gas phase,slurry pH,and magnesium concentration of the scrubbing slurry. Specifically,it was found that the ratio of the gas and liquid film mass transfer resistances (or the fraction to which SO2removal is gas film controlled) increases with increasing slurry pH and magnesium concentration and decreasing SO2partial pressure. Correlations for the gas film mass transfer coefficient and the ratio of mass transfer resistances are shown to predict fairly accurately the experimentally observed SO2removal efficiencies.