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To examine the influence of HCl on SO 2 removal in the spray dry scrubbing process, preliminary experiments on the effect of adding CaCl 2 to the lime slurry on SO 2 absorption efficiency were performed in a laboratory scale spray dryer. It was found that the SO 2 removal efficiency is augmented at CaCl 2 concentrations up to 1.2g/l in the lime slurry. This...