Reduction of combustion generated pollution:Process modifications and energy efficient power cycles

Theoretical bases of combustion process modifications aimed at the reduction of pollutant emission are examined. It is shown, as an example, of how the minimization of emissions of nitrogen oxides leads to a design protocol that translates results of modeling and of bench scale experiments into guidelines for industrial design. The formation and emission of polycyclic aromatic compounds is also considered, because their formation is strongly favored in "low $NO_x$ flames". In power generation the pollutant emission can be reduced effectively by the improvement of the "heat rate,"i.e., the thermodynamic efficiency of the power cycle. Combined gas turbine-steam cycles which have strong potential for high thermal efficiency may, however, present new challenges to combustion research. Technology responses to such problems are discussed.

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1. J.M. Beér, U.S. Patent No. 484540, 1989.
2. J.D. Bittner, J.B. Howard, H.B.s Palmer, “Soot Formation in Combustion Systems and Its Toxic Properties. “J. Laheve and G. Prado, eds., p. 95. Plenum (1983).
3. C.T. Bowman, “Twenty-fourth Symposium (International) on Combustion, Invited Lecturer”, pp. 859-878, 1992. The Combustion Institute, Pittsburgh, PA.
4. J.A. Cole, J.D. Bittner, L.P. Longwell and J.B. Howard, “Formation of Aromatic Compounds in Aliphatic Flames,” Comb. Flame. 56, p. 51 (1984)
5. W.F. Domeracki, T.E. Dowdy, D.M. Bachovchin, “Topping Combustor Development for Second-Generation Pressurized Fluidized Bed Combined Cycles.” Proceedings of the ASME, IGTI 1994 Gas Turbine Conference, 1994.
6 W.F. Domeracki, T.E. Dowdy, and D.M. Bachovchin, ASME-IGT Conference, Houston, TX Paper No. 95-Gt- 106, 1995.
7. C.P. Fenimore, “Thirteenth Symposium (International) on Combustion”. The Combustion Institute, p. 373, 1971.
8. R. Garland, P. Pilsbury, “Status of Topping Combustor Development for Second Generation Fluidized Bed Combined Cycles,” ASME paper 90-GT-30, 1990.
9. R. Garland, P. Pillsbry, and G. Vermes, “Generic Studies of Advanced Fluidized Bed Air Heater Technology,” DOE/DE/40543-5. Westinghouse Electric Corporation, 1986.
10. R.J. Kee, J.A. Miller, and T.H. Jefierson, “CHEMKIN” DOE Sandia Laboratories, New Mexico, Doc. No. SAND 80-8003 (1980).
11. R.J. Kee, F.M. Rupley, and J.A. Miler, CHEMKIN II. Sandia Report SAND 89-8009 Sandia National Labora- tories, Livermore, CA, 1989.
12. J.A. Miller, and C.T. Bowman, “Progress in Energy and Combustion Science” 15, 287, 1989.
13. A. Robertson, R. Garland R. Newby, J. Patel, and L. Rubow, “Second-Generation PFB Combustion Plant Performance and Economics,” EPRI Seminar on Fluidized Bed Combustion Technology for Utility Applications, 1988.
14. J.H. Thijssen, M.A. Toqan, J.M. Beér and A.F. Sarofim “Comb Sci and Techn”, 90, p. 101, 1993.
15. M.A. Toqan, W.F. Farmayan, J.M. Beér, J.B. Howard, and J.D. Teare, Twentieth Symposium (International) on Combustion, p. 1075, The Combustion institute, 1985.
16. M.A. Toqan, J.M. Thijssen, J.M. Beér, and A. Lafleur, Inst. E. 66, pp. 119-125. Wendt. J.O.L., Sternling, C.V. and Matovich, M.A., 1971, Fourteenth Symposium (International) on Combustion. The Combustion Institute, Pittsburgh, PA, PP. 874-904, 1995. 17. J.O.L. Wendt, C.V. Sternling, and M.A. Matovich, “Fourteenth Symposium (International) on Combustion.” The Combustion Institute, Pittsburgh, PA, pp. 897-904, 1971.
18 Y.B. Zeldovich, P.Y. Sadovnikov, and D.A. Frank Kamenetskii, Oxidation of Nitrogen in Combustion (trans. by M. Shelef). Academy of Sciences of USSR, institute of Chemical Physics, Moscow-Leningrad, 1947.