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Show Conclusions One of the keys of calculating the NOx emission of industrial furnaces is the consideration of the effect of burner. Our proposals concerning the classification of burners have been summarized. In order to widen our knowledge about this effect, investigations have been carried out by using rotation-free and rotational burners in an experimental furnace built for this purpose, the chamber-temperature of which has been changed between 800. . 1300°C, what corresponds to the chamber-temperature of annealing and heat treatment furnaces operating in the steel industry. The furnaces were fired by using gas oil in the first research-series, and by using natural gas in the second series, in order that w e can compare the environmental-pollution effects of both fuels. During oil-firing the effects of chamber-temperature, the atomizing cone angle, the position of injector, the pressure of atomization (injection), the air-factor and flue gas recirculation, and during natural gas firing the effects of chamber-temperature, the air factor the steam-content and flue gas recirculation were investigate. The change of NO-concentration was analyzed in the circular section experimental furnace in order to determine the place of NO-development. Acknowledgement Hereby the author would like to express his grateful thanks to the Directors of Independent Research Groups and the O T K A , ( O T K A T-7451 project), of the Hungarian Academy of Sciences for their financial support 6Fenimore,C.P: 7DeSoeteF.C: 8 Bowmann, C.T: 9Biro,A: 10Stamf,DLeuckel, W: 1 l.Flamme.M, Kremer,H: 12Kremer,H: 13.Suzuki, T. etal: 14KJug,H et al: Formation of Nitric Oxide in Premixed Hydrocarbon Flames XIII Symp. on Comb. 1970 pp 373-380. Physikalish-chemische Mechanismen bei Stickstoffoxide-bildung in industriellen Flammen. G W I . 1981/1, pp 15-23 Kinetics of Nitric Oxide Formation in Combustion Processes XV. Conf. on C o m b pp. 729-737 Reduction of NOx emission from natural gas fired industrial fumacesActa Technica Acad Sci. Hung. 105. (1993) 105. pp 131-152 Zur mathematischen Modellierung der Flammenfront-NO Bildung bei turbulenter Verbrennung. G W I 1996/7 pp.350-357 Rrduction of NOx Emission from Industrial Burners for High- temperature Applications. International Gas Research. Conf 1992. pp. 1962-1970. Grundlagen der N O x Enstehung und Minderung. G W I pp 101-107 Heat transfer characteristics and practical applications of high efficiency, low N Ox emission burners Journal of Inst. Energy, Dec. 1982. pp.216-220. Reduzierung der NOx-Emission von Deckensrahlbrennern G W I 1991/1, pp.41-51. References 1 Biro,A: 2Biro, A: 3Biro,A: 4Biro,A: Einfluss des Brennertyps auf die Stromungsverhaeltnisse und den konvektiven Waermeubergang von Ofen, G W I 1/2,1976, pp74-78. Einfluss der Impulskraft auf die Waermeubergang in einem geschlossenen Raum, GWI, 10/1978, pp 566-571. Erfahrungen mit der Erdgasfeuerung in Ungarn. GWI. 8/1967, pp.422-426. Industriellen N O x development in oil-fired research furnace Proceedings of 12* Members Conference of JFRF, Leeuwenhorst,1988, Volume II. 5Bir6,A: Effect of flame temperature on N O x emission at natural gas firing VII. Int. Conf. on Combustion, Hungary, University of Miskolc 1988 .Proceedings, pp.25-39. _X |