"EPA/600-S7-85-045." "November 1985." At head of title: Project Summary. Caption title.

The reduction of NO[subscript x], SO[subscript x], and particulate emissions from utility and industrial boilers has been a high priority concern of the U.S. EPA and all of the major boiler burner manufacturers for several years. In fact, a number of independent concurrent efforts have been and are being conducted to develop low-NO[subscript x] burners. As part of EPA's Limestone Injection into a Multistage Burner (LIMB) program, this program represents one portion of an effort by the EPA to compare the results of these individual studies and identify the most promising approaches for further progress. Five Riley Stoker Corporation (RSC) burners will be tested in the EPA's Large Watertube Simulator (LWS) experimental facility at Energy and Environmental Research Corporation (EER) under this program. Results of these tests will be compared with other burners tested in the LWS and will also be used to project the field performance of the burners. This report summarizes the results of the first phase of testing that evaluated the NO[subscript x] performance and sulfur capture potential of an RSC second-generation low-NO[subscript x] burner. These tests involved the NO[subscript x] optimization of a prototype 1000 x 10p6s Btu/hr RSC Distributed Mixing Burner (DMB) followed by the injection of dry sorbent materials for SOb2s reduction. The DMB was determined to be sensitive to burner adjustments in terms of stability, flame characteristics, and emissions. It was necessary to iteratively modify the coal spreader design and burner adjustments to achieve acceptable NO[subscript x] performance with the three test coals. Following optimization of the burner parameters, the DMB performance was verified over operating ranges typical of field installations. The SOb2s reduction potential of the RSC DMB was studied using two sorbents and two injection locations. The burner was adjusted during injection of sorbent to determine the optimum burner conditions for SOb2s reduction and the extent of NO[subscript x]/SO[subscript x] reduction tradeoffs.