International Scientific Journal


The paper presents results of experimental and numerical investigation addressing combustion of baled agricultural biomass in a 50 kW experimental furnace equipped with cigar burners. Experiments performed included measurements of all parameters deemed important for mass and energy balance, as well as parameters defining quality of the combustion process. Experimental results were compared with results of numerical simulations performed with previously developed CFD model. The model takes into account complex thermo mechanical combustion processes occurring in a porous layer of biomass bales and the surrounding fluid. The combustion process and the corresponding model were deemed stationary. Comparison of experimental and numerical results obtained through research presented in this paper showed satisfactory correspondence, leading to the conclusion that the model developed could be used for analysis of different effects associated with variations in process parameters and/or structural modifications in industrial biomass facilities. Mathematical model developed was also utilized to examine the impact of flue gas recirculation on maximum temperatures in the combustion chamber. Gas recirculation was found to have positive effect on the reduction of maximum temperature in the combustion chamber, as well as on the reduction of maximum temperature zone in the chamber. The conclusions made provided valuable inputs towards prevention of biomass ash sintering, which occurs at higher temperatures and negatively affects biomass combustion process. [Projekat Ministarstva nauke Republike Srbije, br. III 42011: Development and improvement of technologies for energy efficient and environmentally sound use of several types of agricultural and forest biomass and possible utilization for cogeneration i br. TR33042: Fluidized bed combustion facility improvements as a step forward in developing energy efficient and environmentally sound waste combustion technology in fluidized bed combustors]
PAPER REVISED: 2015-11-04
PAPER ACCEPTED: 2015-11-15
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2016, VOLUME 20, ISSUE Supplement 1, PAGES [S151 - S165]
  1. Bech, N. et al., Mathematical Modeling of Straw Bale Combustion in Cigar Burners, Energy & Fuels,10 (1996), 2, pp. 276-283
  2. Mladenović, R. et al., Energy production facilities of original concept for combustion of soya straw bales, Proceedings,16th European Biomass Conference & Exhibition - From Research to Industry and Markets, Valencia, Spain, 2008, pp. 1260-1270
  3. Erić, A., Thermomechanical processes connected to baled soybean residue combustion in the pushing furnace, Ph.D. thesis (in Serbian), Faculty of Mechanical Engineering University of Belgrade, Belgrade, Serbia, 2010
  4. Miltner, M. et al., Process simulation and CFD calculations for the development of an innovative baled biomass-fired combustion chamber, Applied Thermal Engineering, 27 (2007), 7, pp. 1138-1143
  5. Repić, B.S. et al., Development of the Technology for Combustion of Large Bales Using Local Biomass, in: Sustainable Energy - Recent Studies (Ed. A. Gebremedhin), InTech, Wiena, 2012, pp. 55-87
  6. Eric, A. et al., Experimental method for determining Forchheimer equation coefficients related to flow of air through the bales of soy straw, International Journal of Heat and Mass Transfer, 54 (2011), 19-20, pp. 4300-4306
  7. Erić, A. et al., Determination of the stagnant thermal conductivity of the baled soybean residue, (in Serbian), Contemporary agricultural engineering, 36 (2010), 4, pp. 334-343
  8. Patankar, S.V., Numerical Heat Transfer and Fluid Flow, Hemisphere, New York, USA, 1980
  9. Nemoda, S. et al., Numerical Simulation of Reacting Fluid Flow in Porous Media Applied on The Biomass Combustion Research, Proceedings, The First International Conference on Computational MechanicsCM'04, Belgrade, Serbia, 2004, pp. 1-8
  10. Pedras, M.H.J., de Lemos, M.S.J., Thermal dispersion in porous media as a function of the solid-fluid conductivity ratio, International Journal of Heat and Mass Transfer, 51 (2008), 21-22, pp. 5359-5367
  11. de Lemos, M.J.S., Turbulence in Porous Media: Modeling and Applications, Elsevier, Amsterdam, The Netherlands, 2006
  12. Kaviany, M., Principles of Heat Transfer in Porous Media, Second Edition, Springer-Verlag, New York, USA, 1999
  13. Nield, D.A., Bejan, A., Convection in Porous Media, Springer Science and Business Media, Inc. New York, USA, 2006.
  14. Eric, A. et al., Experimental determination thermo physical characteristics of balled biomass, Energy, 45 (2012), 1, pp. 350-357

© 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