Journal of the Korean Society of Combustion (한국연소학회지)

The Korean Society of Combustion (한국연소학회)
권호 표지

Computational Study of the MILD Combustion and Pollutant Emission Characteristics in Jet Flow Field

제트 유동장에서의 마일드 연소 및 오염물질 배출특성에 관한 전산해석 연구

  • 김유정 (부경대학교 안전공학과) ;
  • 송금미 (부경대학교 안전공학과) ;
  • 오창보 (부경대학교 안전공학과)
  • Received : 2012.12.06
  • Accepted : 2012.12.11
  • Published : 2012.12.30
Download PDF
⟨ Previous Next ⟩

Abstract

The MILD combustion and pollutant emission characteristics were investigated computationally. The temperature of supplying air-stream and mixing rate (${\Omega}$) of exhaust gas in the air-stream were adjusted to investigate the effects of those parameters on the MILD combustion in jet flow field. The emission indices for NO (EINO) and CO (EICO) were introduced to quantify the amount of those species emitted from the combustion. The high-temperature region disappeared gradually as the mixing rate increased for fixed air-stream temperature. The EINO increased as the air-stream temperature became higher for fixed mixing rate, and the EINO decreased dramatically with increasing the mixing rate for each air-stream temperature condition. The EICO also decreased with increasing the mixing rate and it was nearly independent of air-stream temperature except for near ${\Omega}$ = 0.7. It was found that the CO supplied in the air-stream can be destroyed in the MILD combustion over the certain mixing rate.

Keywords

References

  1. A. Cavaliere, M. Joannon, "Mild Combustion", Progr. Energy Combust. Science, Vol. 30, 2004, pp. 329-366. https://doi.org/10.1016/j.pecs.2004.02.003
  2. G. G. Szego, B. B. Dally, G. J. Nathan, "Operational characteristics of a parallel jet MILD combustion burner system", Combustion and Flame, Vol. 156, 2009, pp. 429-438. https://doi.org/10.1016/j.combustflame.2008.08.009
  3. B. B. Dally, S. H. Shim, R. A. Craig, P. J. Ashman, G. G. Szego, "On the Burning of Sawdust in a MILD Combustion Furnace", Energy and Fuels, Vol. 24, 2010, pp. 3462-3470. https://doi.org/10.1021/ef901583k
  4. C. Galletti, A. Parente, L. Tognotti, "Numerical and Experimental Investigation of a Mild Combustion Burner", Combust. Flame, Vol. 151, 2007, pp. 649-664. https://doi.org/10.1016/j.combustflame.2007.07.016
  5. Fluent 13.0 User's Guide. ANSYS, Inc.
  6. C. B. Oh, E. J. Lee, G. J. Jung, "Unsteady autoignition of hydrogen in a perfectly stirred reactor with oscillating residence times", Chemical Engineering Science, Vol. 66, 2011, pp. 4605-4614. https://doi.org/10.1016/j.ces.2011.06.029
  7. F. C. Christo, B. B. Dally, "Modeling turbulent reacting jets issuing into a hot and diluted coflow", Combust. Flame, Vol. 142, 2005, pp. 117-129. https://doi.org/10.1016/j.combustflame.2005.03.002
  8. B. F. Magnussen, "On the structure of turbulence and a generalized eddy dissipation concept for chemical reaction in turbulent flow." Nineteeth AIAA Meeting, St. Louis, 1981.
  9. B. F. Magnussen and B. H. Hjertager., "On mathematical models of turbulent combustion with special emphasis on soot formation and combustion", 16th Int. Symp. Combustion, The combustion institute, 1976.
  10. F. L. Dryer, I. Glassman, "High-Temperature Oxidation of CO and $CH_4$", Proc. Combustion Institute, Vol. 14, 1973, pp. 987-1003. https://doi.org/10.1016/S0082-0784(73)80090-6
  11. T. Takeno, M. Nishioka, "Species Conservation and Emission Indices for Flames Described by Similarity Solutions", Combustion and Flame, Vol. 92, 1933, pp. 465-468.
  12. K. M. Song, C. B. Oh, "Ignition of $CH_4$ by Counterflowing Hot Air Diluted with Combustion Products", Mediterranean Combustion Symposium, Vol. 7, 2011, pp. 69.