Caption title. At head of title: Project summary. Distributed to depository libraries in microfiche. "Dec. 1985." "EPA/600-S7-85-046."

The expanded use of coal for utility and industrial boiler applications has focused attention on the control of NO[subscript x] and SOb2s emissions from pulverized coal combustion. Various EPA programs have demonstrated the principle of staged combustion as a means of controlling NO[subscript x] emissions. Other programs are evaluating the potential for SOb2s control with the injection of calcium-based sorbents into furnace combustion chambers. Under this program, Steinmuller Staged Mixing (SM) burners were tested in EPA's Large Watertube Simulator (LWS) test facility. The objectives of the program were to provide a comparative evaluation of the SM burner in the LWS with field operation and to optimize its performance for low NO[subscript x] emissions, high efficiency, and combined NO[subscript x]/SOb2s control with sorbent injection. The experimental effort included evaluating two SM burners in the LWS using three coals and three sorbents. The evaluation of the two burners, the Weiher SM burner currently in operation in a 700 MW boiler in West Germany and a second generation SM burner, included characterization of burner performance and NO[subscript x] emissions and SOb2s reduction with sorbent injection through burner passages. The impact of the NO[subscript x] and SOb2s control techniques on ash characteristics (including slagging and fouling behavior, and SOb2s/SOb3s speciation) was also evaluated.