SECOND GENERATION ADVANCED REBURNING FOR HIGH EFFICIENCY NOx CONTROL

This project is designed to develop a family of novel NO{sub x} control technologies, called Second Generation Advanced Reburning which has the potential to achieve 90+ NO{sub x} control in coal fired boilers at a significantly lower cost than Selective Catalytic Reduction. The sixth reporting period in Phase II (January 1-March 31, 1999) included experimental activities and combined chemistry-mixing modeling on advanced gas reburning. The goal of combustion tests was to continue the work on identifying prospective promoters for the advanced reburning process. Tests were conducted in Controlled Temperature Tower (CTT) and Boiler Simulator Facility (BSF). Tests showed that some promoters significantly affect the reburning process when co-injected with NH{sub 3} . The promoters injected into reburning zone without NH{sub 3} in the amount 30 ppm do not significantly affect the reburning process. The modeling effort was focused on the description of Na effect on CO emissions in advanced reburning. Increase in CO concentration in flue gas upon Na injection results from inhibition of CO oxidation by Na species in the burnout zone