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Abstract
In the In-Duct Injection Process, a lime slurry is sprayed into the flue gas between the air preheater and solids collection equipment, and about 30-60 percent removal of SO2 is achieved. A simple model of this process has been developed based on heat and mass transfer theories, and this model was fitted to the data obtained at proof-of-concept test units. Data taken with separate injection of dry lime and water were also modeled, but the SO2 removal was less than for slurry injection, probably because of incomplete capture of lime particles by the water droplets.