International Scientific Journal


The aim of this paper is to examine whether the use of baffles in a combustion chamber, one of the well-known low-cost methods for the boiler performance improvement, can be enhanced. Modern day tools like computational fluid dynamics were not present at the time when these measures were invented, developed and successfully applied. The objective of this study is to determine the influence of location and length of a baffle in a furnace, for different mass flows, on gas residence time. The numerical simulations have been performed of a simple Scandinavian stove like furnace. The isothermal model is used, while air is used as a medium and turbulence is modeled by realizable k-epsilon model. The Lagrange particle tracking is used for the residence time distribution determination. The statistical analysis yielded the average residence time. The results of the computational fluid dynamics studies for different baffle positions, dimensions and flow rates show from up to 17% decrease to up to 13 % increase of residence time. The conclusion is that vertical position of the baffle is the most important factor, followed by the length of the baffle, while the least important showed to be the mass flow. [Projekat Ministarstva nauke Republike Srbije, br. III 43008: Development of methods, sensors and systems for monitoring of quality of water, air and land]
PAPER REVISED: 2013-12-03
PAPER ACCEPTED: 2014-06-08
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THERMAL SCIENCE YEAR 2015, VOLUME 19, ISSUE Issue 1, PAGES [305 - 316]
  1. Ebeling, J., Jenkins, B., Thermocemical properties of biomass fuels, Agricultural and natural resources communication services webserver,
  2. Domalski, E. et al., Thermodynamic data for biomass conversion and waste incineration, Technical report No.: SERI/SP-271-2839, National bureau of standards, Boulder, USA, 1986
  3. Martinov, M., et al., Efficiency and emission of crop residues combustion facilities in Serbia - Status and needed measures for improvement, Thermal Science, 10 (2006), Suppl., No. 4, pp. 189-194
  4. Pešenjanski, I., Stepanov, B., Test results for a 250 KW bio-mass energy boiler and suggested technical and organizational measures to increase energy efficiency of current boiler installations, Savremenapoljoprivrednatehnika, 30 (2005), 4, pp. 197-203
  5. Trinks, W. et al., Industrial Furnaces, Sixth edition, John Wiley & Sons, Inc., Hoboken, N.J., USA, 2004
  6. Nasserzadeh, V. et al., Effects of high speed jets and internal baffles on the gas residence times in large municipal incinerators, Environmental Progress, 13 (1994), 2, pp. 124-133
  7. Shelton, J., Jay Shelton's solid fuels encyclopedia, Garden Way Publishing, Charlotte, Vt, USA, 1983
  8. Kreuh, L., Steam generators (in Croatian language), Školskaknjiga, Zagreb, Croatia, 1978
  9. Wick, O, Wik, M., Wood stoves : how to make and use them, Northwest Pub. Co. Anchorage, Alaska, USA, 1977
  10. Hartmann, H. et al., Handbuch Bioenergie-Kleinanlagen, Fachagentur Nachwachsende Rohstoffe e.V. (FNR),
  11. Dimaczek, G. et al., Kleinfeuerungsanlage für Getreide und Stroh abschlussbericht für Fachagentur Nachwachsende Rohstoffe e.V. Gülzow, ATZ Entwicklungszentrum,
  12. Eltrop, L., et al., Leitfaden Bioenergie - Planung, Betrieb und Wirtschaftlichkeit von Bioenergieanlagen, Fachagentur Nachwachsende Rohstoffe,
  13. Scott, A.J., Real-life emissions from residential wood burning appliances in New Zealand,
  14. Todd, J.J., Research relating to regulatory measures for improving the operation of solid fuel heaters, Eco-energy options, Prepared for the New South Wales Department of Environment and Conservation,
  15. Van Loo, S., Koppejan (eds.), J., Handbook of biomass combustion and co-firing, Twente, the Netherlands, Twente university press, 2002
  16. Beer, J.M., Lee, K.B., The Effect of the Residence Time Distribution on the Performance and Efficiency of Combustors, Symposium (International) on Combustion, 10 (1965), 1, pp. 1187-1202
  17. Swithenbank, J. et al., Combustion design fundamentals,Symposium (International) on Combustion,14 (1973),1, pp. 627-638
  18. Han, J-H. ,et al., A hot-flow model analysis of the msw incinerator, International journal of energy research, 21(1997), pp. 899-910
  19. Fehr, M., Vaclavinek,J., A cold model analysis of solid waste incineration, International journal of energy research, 16 (1992), pp. 277-283
  20. Choi, S. et al., Cold flow simulation of municipal waste incinerators, Proceedings, 25th Int. Symp. On Combustion, The Combustion Insitute, Irvine, CA, USA, 1994, pp. 317-323
  21. Ravichandran, M., Gouldin, F.C., Numerical Simulation of Incinerator Overfire Mixing. Combustion Science & technology, 85(1992), pp. 165-185
  22. Nasserzadeh, V., Swithenbank, J., Design optimization of a large municipal solid waste incinerator, Waste Management, 11 (1991), pp. 249-261
  23. Nasserzadeh, V. et al., Effects of high speed jets and internal baffles on the gas residence times in large municipal incinerators, Environmental Progress, 13 (1994), 2, pp. 124-133
  24. ***, Personal communication with PhD mentor professor Pešenjanski
  25. Seeker, W. R. et al., Municipal waste combustion study: Combustion control of MSW combustors to minimize emission of trace organics, Technical report: EPA/530-SW-87-021x, EPA, NY, US, 1987
  26. ***, Star CCM+ manual, CD-Adapco. Melville, NY, USA.
  27. Brkić, Lj., Živanović, T., Thermal calculation of steam boilers (in Serbian language), Beograd, Srbija, Mašinskifakultet, 1984.

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