International Scientific Journal


Combustion of coals and biomass in boiler furnaces leads to formation of fireside deposits on irradiated and convective surfaces. This problem is not a new one, but it became one of the main operational problems in boilers using low rank coal and some sort of biomass. In the paper presented are the results of research of ash deposit processes in laboratory conditions. An experimental furnace was used for these purposes. The experiments were performed on a tubular experimental furnace which ensures appropriate temperature and mass transfer conditions for physical and chemical transformations of the mineral matter of fuel as in real conditions. The main working parameters can be varied in wide ranges. The influence of grinding fineness, excess air and wall surface temperature was analysed. Also, an ash related problems during coal and biomass combustion was considered. Key empirical correlations for slagging and fouling were tested. Two types of Serbian coals (Kolubara and Kosovo) and several biomasses were analysed. It was shown that many sorts of biomass and Kosovo coal have a great propensity to slagging and fouling. [Project of the Serbian Ministry of Education, Science and Technological Development, Grant no. III42011: 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]
PAPER REVISED: 2019-02-01
PAPER ACCEPTED: 2019-05-08
CITATION EXPORT: view in browser or download as text file
THERMAL SCIENCE YEAR 2019, VOLUME 23, ISSUE Supplement 5, PAGES [S1575 - S1586]
  1. Repic, B., et al., Investigation of Rate of Ash Deposit Formation on Heat Transfer Surfaces of Boilers, Industrial Furnaces and Boilers, Rio Tinto, Portugal, 1995, Vol. 1, pp. 229-237
  2. Werther, J., et al., Combustion of Agricultural Residues, Progress in Energy and Combustion Science, 26 (2000), 1, pp. 1-27
  3. Saidur, R., at al., A Review on Biomass as Fuel for Boilers, Renewable and Sustainable Energy Reviews, 15 (2011), 5, pp. 2262-2289
  4. Repić, B., Kinetics of the Ash Deposit Formation of the Convective and Irradiated Surfaces in the Boiler Furnaces Using Pulverized Coal, (in Serbian), MSc. Thesis, University of Belgrade, 1979
  5. Savić, D., et al., Investigation of Tendencies of the Lignites from the Kolubara, Kostolac and Kosovo Basins Towards Formation of Deposits on Heat Transfer Surfaces During Combustion in Boiler Furnaces, Bulletin LXV de l'Academie Serbe des Sciences et des Arts, Classe des Sciences techniques, No 15., pp. 21-46, Belgrade, 1979
  6. Repic, B. at al., Investigation of the Cigar Burner Combustion System for Baled Biomass, Biomass and Bioenergy, 58 (2013), 11, pp.10-19
  7. Mladenović, R., et al., The Boiler Concept for Combustion of Large Soya Straw Bales, Energy, 34 (2009), 5, pp. 715-723
  8. Pronobis, M., Evaluation of the Influence of Biomass co-combustion on Boiler Furnace Slagging by Means of Fusibility Correlations, Biomass and Bioenergy, 28 (2005), 4, pp. 375-383
  9. Harding, N. S., O'Connor, D. C., Ash Deposition Impacts in the Power Industry, Fuel Processing Technology, 88 (2007), 11-12, pp. 1082-1093
  10. Jenkins, B. M., et al., Combustion Properties of Biomass, Fuel Processing Technology, 54 (1998), 1-3, pp. 17-46
  11. Vassilev, V. S., et al., An overview of the chemical composition of biomass, Fuel, 89 (2010), 5, pp. 913-933
  12. Baxter, L. L., et al., The Behavior of Inorganic Material in Biomass-Fired Power Boilers: Field and Laboratory Experiences, Fuel Processing Technology, 54 (1998), 1-3, pp. 47-78
  13. Nordgren, D., Experimental Studies of Pulverised Biomass Combustion - Impacts on Ash Transformations and Process Temperature, Ph. D. Thesis, Lulea University of Technology, Lulea, Sweden, 2011
  14. Ohman, M., et al., Slagging Tendencies of Wood Pellet Ash During Combustion in Residential Pellet Burners, Biomass and Bioenergy, 27 (2004), 6, pp. 585-596
  15. Hansen, K. W., et al., Cofiring Coal and Straw in a 150 MWe Power Boiler Experiences, Biomass and Bioenergy, 19 (2000), 6, pp. 395-409
  16. Mladenović, M., et al., Criteria Selection for the Assessment of Serbian Lignites Tendency to Form Deposits on Power Boilers Heat Transfer Surfaces, Thermal Science, 13 (2009), 4, pp. 61-78
  17. Vamvuka, D., Zografos, D., Predicting the Behaviour of Ash from Agricultural Wastes During Combustion, Fuel, 83 (2004), 14-15, pp. 2051-2057
  18. Gudka, B., et al., A Review of the Mitigation of Deposition and Emission Problems During Biomass Combustion Through Washing Pre-Treatment, J Energy Inst 89 (2016), 2, pp. 159-171
  19. Mladenović, M., Choice of Criteria for the Assessment of Tendency of Domestic Lignites Towards Deposit Formation on Power Boilers Heat Transfer surfaces (in Serbian), MSc Thesis, University of Belgrade, 2005
  20. Winegartner, E. C., Coal Fouling and Slagging Parameters, ASME Research Committee on Corosion and Deposits from Combustion Gases, ASME, USA, 1974
  21. Vamvuka, D., et al., Evaluation of Ashes Produced from Fluidized Bed Combustion of Residues from Oranges' Plantations and Processing, Renewable Energy 72 (2014), pp. 336-343
  22. Jenkins, B. M., et al., On the Properties of Washed Straw, Biomass and Bioenergy, 10 (1996), 4, pp. 177-200
  23. Marinković, A., et al., Characteristics of Agricultural Biomass Exposed to the Process of Leaching and Washing, Contemporary Agricultural Engineering, 39 (2013), 4, pp. 229-236

© 2020 Society of Thermal Engineers of Serbia. Published by the Vinča Institute of Nuclear Sciences, 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