Abstract
Soluble additives to enhance spray dryer performance for sulfur dioxide (SO2) removal from flue gas have been evaluated in a pilot plant system under controlled conditions. These additives have included NaOH, NaHCO3, NaCl and CaCl2. These additives were chosen because of their hygroscopicity as solids, and the understanding that SO2 reactivity is significantly enhanced in the liquid phase of the spray drying operation. All of the additives enhanced SO2 removal above baseline Ca(OH)2 slurry usages, with NaOH providing the greatest degree of enhancement at approach to adiabatic saturation temperatures below 16.7 °C. The percent of enhancement per unit mass of additive was found to decrease with additive concentrations above 100 mg l−1. The enhancement effect may be explained by analyzing the vapor pressure lowering effect of the slurry droplets containing the additives. This procedure may by appropriate for estimating the enhancement by other hygroscopic solids for spray dryer flue gas desulfurization impro...
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