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Show ABSTRACT AFRC90 Paper 39 For Presentation at the American Flame Research Committee 1990 Fall International Symposium San Francisco, California November 1990 N20 FORMATION IN SELECTIVE NON-CATALYTIC NOx REDUCTION PROCESS· "::;;p k...vL. J. Muzio, T. D. Martz, T. A. Montgomery, G. C. Quartucy Fossil Energy Research Corporation 23342 C South Pointe Laguna Hills, CA 92653 J. A. Cole, J. C. Kramlich Energy and Environmental Research Corporation 18 Mason Irvine, California 92718 NOx control techniques currently under development Include combustion modification and post-combustion techniques. As these technologies are developed and implemented, it is important to ensure that NOx reductions are not achieved at the expense of producing other undesirable species. One possible concern Is the production of N20 from the NOx reduction process. The current work addressed the potential N20 production from selective non-catalytic NOx reduction (SNCR processes using ammonia, urea, and cyanuric acid injection). Previous work with SNCR processes has shown that ammonia injection produces minimal N20 emissions, while cyanuric acid Injection has, under certain conditions, almost quantitatively converted NOx to N20. It has been suggested that urea might behave as a hybrid between ammonia and cyanuric- acid. In the work described here, pilot scale testing and chemical kinetic modeling were used to characterize the N20 production from these processes over a range of process parameters. The data show that SNCR processes were all found to produce some N20 as a by-product. Ammonia Injection produced the lowest levels of N20 with N20 levels less than 4% of the NOx reduced. Cyanuric acid produced the highest levels ranging from 12-40% of the NO)( reduced. The conversion of NO)( to N20 with the urea injection ranged from 7-25% • ·Work sponsored by U.S. DOE AR&TD (DE-AC22-88PC88943) /¥.s r/CV;l?~r 13 y #~7Zt(...-tr8A- (j)Gl/ELoPt:-J> By LJ, C7tL. - :rarvll\. e) JL |