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Show 9 It is noteworthy that the very low NOx emissions form both the mildly staged and more deeply staged PPM flames were obtained with a radial air flow distribution in which more than 50% of the total air flow was introduced through the transport plus primary air conduits. This has resulted in the maximum yield of volatile matter, stable ignition and a steep initial temperature rise, factors which are conducive to the production of a hot flame core, a prerequisite of low-NOx operation. Acknowledgments The authors are grateful for the stimulating discussions with the B&W visiting team, Jennifer Sivy and John Koslosky. They thank Tony Mayne, the DOE-PETe Program Manager, for his help and encouragement throughout the program. The valuable assistance of the MIT -CRF technical staff, Don ~ Bill Mason, Mark James and Richard Gray is gratefully acknowledged. Thanks are due to Ms. Bonnie Caputo for the preparation of this manuscript Financial support from the B& W DOE LEBS Program is acknowledged with thanks. References 1. Toqan, MA, J.M Beer, P. Jansohn, N. Sun, A Testa, A Shihadeh, and J.D. Teare, Low NOx Emission from Radially Stratified Natural Gas-Air Turbulence Diffusion Flames. Presented at the 24th Symposium (International) on Combustion, Sydney, NSW, Australia, July 5-10, 1992. 2. Shihadeh, A, M Toqan, P. Lewis, and JoM Beer, "Low NOx Emission from Aerodynamically Staged Oil-Air Turbulent Diffusion Flames," Presented at Combustion Institute - Eastern States Meeting, Sept 1993. |