THERMAL SCIENCE

International Scientific Journal

Enrico Mollica

,

Eugenio Giacomazzi

,

Alessandro Di Marco

NUMERICAL STUDY OF HYDROGEN MILD COMBUSTION

ABSTRACT
In this article a combustor burning hydrogen and air in mild regime is numerically studied by means of computational fluid dynamic simulations. All the numerical results show a good agreement with experimental data. It is seen that the flow configuration is characterized by strong exhaust gas recirculation with high air preheating temperature. As a consequence, the reaction zone is found to be characteristically broad and the temperature and concentrations fields are sufficiently homogeneous and uniform, leading to a strong abatement of nitric oxide emissions. It is also observed that the reduction of thermal gradients is achieved mainly through the extension of combustion in the whole volume of the combustion chamber, so that a flame front no longer exists ('flameless oxidation'). The effect of preheating, further dilution provided by inner recirculation and of radiation model for the present hydrogen/air mild burner are analyzed.
KEYWORDS
hydrogen, flameless combustion, computational fluid dynamics
PAPER SUBMITTED: 2008-07-17
PAPER REVISED: 2009-03-06
PAPER ACCEPTED: 2009-04-15
DOI REFERENCE: https://doi.org/10.2298/TSCI0903059M
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2009, VOLUME 13, ISSUE Issue 3, PAGES [59 - 67]
REFERENCES
  1. Cavaliere, A., de Joannon, M., MILD Combustion, Progress in Energy and Combustion Science, 30 (2004), 4, pp. 329-66
  2. Choi, G., Katsuki, M., Chemical Kinetic Study on the Reduction of Nitric Oxide in Highly Preheated Air Combustion, Proceedings of the Combustion Institute, Pittsburgh, Penn., USA, 2003, Vol. 1, pp. 165-171
  3. Dally, B. B., Karpetis, A. N., Barlow, R. S., Structure of Turbulent Non-Premixed Jet Flames in a Diluted Hot coflow, Proceedings of the Combustion Institute, Pittsburgh, Penn., USA, 2003, Vol. 1, pp. 147-154
  4. Gupta, A. K., Bolz, S., Hasegawa, T., Effect of Preheat Temperature and Oxygen Concentration on Flame Structure and Emission, Journal of Energy Resources Technology, 121 (1999), 3, pp. 209-216
  5. Katsuki, M., Hasegawa T., The Science and Technology of Combustion in Highly Preheated Air, Proceedings, 27th Symposium (Int.) on Combustion, The Combustion Institute, Pittsburgh, Penn., USA, 1999, pp. 3135-3146
  6. Mastorakos, E., Taylor, A. M. K. P., Whitelaw, J. H., Extinction of Turbulent Counterflow Flames with Reactants Diluted by Hot Products, Combustion and Flame, 102 (1995), 1, pp. 101-114
  7. Peters, N., Principles and Potential of HiCOT Combustion, Proceedings, Forum on High-Temperature Air Combustion Technology, Tokyo, 2001, pp. 109-128
  8. Cavigiolo, A., et al., Mild Combustion in a Laboratory-Scale Apparatus, Combustion Science and Technology, 175 (2003), 6, pp. 1347-1367
  9. Dally, B. B., Riesmeier, E., Peters, N., Effect of Fuel Mixture on Moderate and Intense Low Oxygen Dilution Combustion, Combustion and Flame, 137 (2004), 4, pp. 418-431
  10. Derudi, M., Villani, A., Rota, R., Sustainability of Mild Combustion of Hydrogen-Containing Hybrid Fuels, Proceedings of the Combustion Institute, Pittsburgh, Penn. USA, 2003, Vol. 1, pp. 3393-3400
  11. Galbiati, A., et al., Mild Combustion for Fuel NOx Reduction, Combustion Science and Technology, 176 (2004), 7, pp. 1035-1054
  12. Plessing, T., Peters, N., Wunning J. G., Laseroptical Investigation of Highly Preheated Combustion with Strong Exhaust Gas Recirculation, 27th Symposium (Int.) on Combustion, The Combustion Institute, Pittsburgh, Penn., USA, 1999, Vol. 3, pp. 197-204
  13. Wunning, J. A., Wunning, J. G., Flameless Oxidation to Reduce Thermal NO Formation, Progress in Energy and Combustion Science, 23 (1997), 1, pp. 81-94
  14. Milani, A., Mild Combustion Techniques Applied to Regenerative Firing in Industrial Furnaces, Proceedings, 2nd International Seminar on High Temperature Air Combustion in Industrial Furnaces, Stokholm, 2000, pp. 52-60
  15. Oberlack, M., Arlitt, R., Peters, N., On Stochastic Damkohler Number Variations in a Homogeneous Flow Reactor, Combustion Theory and Modeling, 4 (2000), 4, pp. 495-509
  16. Ozdemir, I. B., Peters, N., Characteristic of the Reaction Zone in a Combustor Operating at MILD Combustion, Experiments in Fluids, 30 (2001), 6, pp. 683-695
  17. Galletti, C., et al., Experimental and Numerical Investigation of a Burner Operating in MILD Combustion Conditions, Proceedings, 3rd Europeran Combustion Meeting, Chania, Greece, 2007, pp. 1-12
  18. Derudi, M., Personal Communication, 2008
  19. Magnussen, B. F., On the Structure of Turbulence and a Generalized Eddy Dissipation Concept for Chemical Reaction in Turbulent Flow, Proceedings, 19th AIAA Meeting, St. Louis, Mo., 1981, 1-7
  20. Cheng, P., Two-Dimensional Radiating Gas Flow by a Moment Method, AIAA Journal, 2 (1964), 9, pp. 1662-1664
  21. Maas, U., Warnatz, J., Ignition Processes in Hydrogen-Oxygen Mixtures, Combustion and Flame, 74 1988, 1, pp. 53-69
  22. Zeldovich, Y. B., The Oxidation of Nitrogen in Combustion and Explosions, Acta Physiochimica U.R.S.S., XXI (1946)
  23. Behrendt, F., Warnatz, J., The Dependence of Flame Propagation in H2-O2-N2 Mixtures on Temperature, Pressure and Initial Composition, International Journal of Hydrogen Energy, 10 (1985), 11, pp. 749-755
  24. Miller, J. A., Bowman, C. T., Mechanism and Modelling of Nitrogen Chemistry in Combustion, Progress in Energy and Combustion Science, 15 (1989), 4, pp. 287-338
  25. Glassman, I., Combustion, Academic Press, San Diego, Cal., USA, 1996
  26. Peters, N., Turbulent Combustion, Cambridge University Press, Cambridge, UK, 2000
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Numerical study of hydrogen mild combustion

© 2024 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, National Institute of the Republic of Serbia, Belgrade, Serbia. This article is an open access article distributed under the terms and conditions of the Creative Commons Attribution-NonCommercial-NoDerivs 4.0 International licence