Caption title. "EPA/600-S7-86-026." "September 1986." At head of title: Project summary.

Pilot scale combustion tests were conducted on a Riley Stoker second generation low-NO[subscript x] burner combined with dry sorbent injection for sulfur dioxide (SOb2s) control. The burner design is based on the distributed mixing concept. Combustion tests were conducted at 100 x 10p6s Btu/hr (29 MW0 in EPA's Large Watertube Simulator (LWS) test furnace. Results were obtained for three different U.S. coals and two sorbents. Nitrogen oxides (NO[subscript x]) were reduced by up to 60% with this advanced burner design. SOb2s reductions of 50% at a Ca/S ratio of 2 were obtained with hydrated lime (Ca(OH)b2s). Highest reductions were achieved when the hydrozide was injected through tertiary air ports on the periphery of the burner. When limestone was used as the sorbent, SOb2s capture was on the order of 35% at a Ca/S of 2. In order to aid the scale-up of the pilot scale results to utility and industrial boilers, two commercial Riley burners were also tested at two different scales (100 and 50 x 10p6s Btu/hr). A furnace heat release parameter was used to extrapolate pilot scale NO[subscript x] emissions to operating field boilers. In addition, the Riley burner test results are compared with data from other burners also tested in the LWS test facility.