A combined ca(Oh)2/nh3 flue gas desulfurization process for high sulfur coal: Results of a pilot plant study

Abstract

The removal of S02 with atomization of a slaked lime slurry and supplemental injection of gaseous NH3 were tested in a conventional spray dryer/baghouse system for S02 concentrations of 2000 ppm and 3000 ppm and a 30° F approach to saturation. Results at 3000 ppm of S02 showed an average S02 removal efficiency of 90.3 percent at a combined stoichiometric ratio of 0.95-1.10 and an average overall sorbent utilization of 91.6 percent. The overall molal ratio of NH3/S02 reaction was found to be 2:1 under the test conditions! Particle size analyses, and EP toxicity tests were conducted on the products of the reactions. © 1990 Air and Waste Management Association.