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Abstract
A laboratory size spray dry scrubbing unit consisting of a spray dryer and a pulse Jet baghouse was used to study the effect of grinding recycle waste on SO2 removal across the spray dryer and on sorbent utilization. The equipment treats simulated flue gas with a dry flow rate of 1.5 m3 h−1 (stp) and utilizes an ultrasonic nozzle for atomization. The apparatus was initially tested over a broad range of operating conditions; a close agreement in SO2 removal was found with data from much larger units. The effect of grinding the FGD recycle material on the SO2 removal across the spray dryer was found to be great. Grinding the recycle material can enhance the SO2 removal efficiency to a level comparable to operation with a large excess of fresh lime.