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Show especially the role of the ash. More accurate data are required for the precise design of power station burners and combustion chambers. Acknowledgements This work has been supported by EPSRC and forms part of the DTI-NOx project. W e would like to thank Mr. J. Taylor, Mr. D. Hainsworth for helpful assistance. References 1. Williams, A., Pourkashanian, M., Bysh, P. and Norman, J.S. Fuel, Vol. 73, 7, 1006-1019 1994. 2. Weber, R., Peters, A.A.F., Breithaupt, P.P. and Visser, B.M. The ASME, FACT Vol. 17, Book No. H00827, 71-86, 1993. 3. Niksa, S. and Lau, C-W. Combustion and Flame, 24, 293-307, 1993. 4. Kobayashi, H., Howard, J.B. and Sarofim, A.F. Sixteenth Symposium (International) on Combustion, The Combustion Institute, Pittsburgh, 411, 1976. 5. Williams, A., Pourkashanian, M., Jones, J.M. and Rowlands, L. A Review of NOx formation and reduction mechanisms in combustion systems with particular reference to coal. Third International Conference on Combustion and Emissions Control, The Institute of Energy, Bath, June 1997. 6. Baum, M.M. and Street, P.J. Combust. Sci. Technol 1, 231, 1971. 7. Essenhigh, R.H, and Mescher, A.M. Twenty-Sixth Symposium (International) on Combustion, The Combustion Institute, 3085-3094, 1996. 8. Hampartsoumian, E., Pourkashanian, M. and Williams, A. J.Inst.E. 62, 48, 1989. 9. Charpenay, S., Serio, MA. and Solomon, P.R. International Conference on Coal Science, Banff, Canada, Vol. II, 189, 1993; also Charpenay, S., Serio, M.A. and Solomon, P.R' Twenty-Fourth Symposium (International) on Combustion, The Combustion Institute 1189- 1197, 1992. 10. Chan, M-L, Jones, J.M., Pourkashanian, M. and Williams, A. The oxidative reactivity of coal chars in relation to their structure. American Chemical Society, Fuel Division, San Francisco, 1997. 11. Hurt, R.H. and Davis, K.A. Twenty-Fifth Symposium (International) on Combustion, The Combustion Institute, 561-568, 1994; also Hurt, R.H. and Mitchell, R.E. Twenty-Fourth Symposium (International) on Combustion, The Combustion Institute, 1243-1250, 1992 n |