International Scientific Journal


Thermal power plants in the Republic of Serbia are making considerable efforts and even more considerable investments, not only to maintain electricity production at maximum design levels, but even to additionally increase the power output of existing generating units. Capacities of mills used in pulverized coal preparation are identified as one of the main constraints to achieving maximum mill plant capacity, while coal grindability is seen as one of the factors that directly affect capacities of the coal mills utilized in thermal power plants. The paper presents results of experimental investigation conducted for the purpose of determining Hardgrove grindability index of coal. The investigation was conducted in accordance with ISO 5074 and included analysis of approximately 70 coal samples taken from the open pit mine of Kolubara coal basin. Research results obtained indicate that coal rich in mineral matter and thus, of lower heating value is characterized by higher grindability index. Therefore, analyses presented in the paper suggest that characteristics of solid fuels analyzed in the research investigation conducted are such that the use coals less rich in mineral matter i. e. coals characterized by lower grindability index will cause coal mills to operate at reduced capacity. This fact should be taken into account when considering a potential for electricity production increase.
PAPER REVISED: 2011-03-04
PAPER ACCEPTED: 2011-03-20
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THERMAL SCIENCE YEAR 2011, VOLUME 15, ISSUE Issue 1, PAGES [267 - 274]
  1. Özbayoğlu, G., Özbayoğlu, M. A., Özbayoğlu, E. M., Estimation of Hardgrove Grindability Index of Turkish Coals by Neural Networks, International Journal of Mineral Processing, 85 (2008), 4, pp. 93-100
  2. Rubiera, F., et al., Effect of the Grinding Behaviour of Coal Blends on Coal Utilisation for Combustion, Powder Technology, 105 (1999), 1-3, pp. 351-356
  3. Sengupta, A. N., An Assessment of Grindability Index of Coal, Fuel Processing Technology, 76 (2002), 1, pp. 1-10
  4. Ural, S., Akyildiz, M., Studies of the Relationship between Mineral Matter and Grinding Properties for Low-Rank Coals, International Journal of Coal Geology, 60 (2004), 1, pp. 81-84
  5. Peisheng, L., et al., Prediction of Grindability With Multivariable Regression and Neural Network in Chinese Coal, Fuel, 84 (2005), 18, pp. 2384-2388
  6. Csoke, B., et al., Selective Grindability of Lignites and Their Application for Producing an Advanced Fuel, Applied Energy, 74 (2003), 3-4, pp. 359-368.
  7. Vuthaluru, H. B., et al., Effects of Moisture and Coal Blending on Hardgrove Grindability Index of Western Australian Coal, Fuel Processing Technology, 81 (2003), 1, pp. 67-76.
  8. Trimble, A. S., Hower, J. C., Studies of the Relationship between Coal Petrology and Grinding Properties, International Journal of Coal Geology, 54 (2003), 3-4, pp. 253-260
  9. Jorjani, E., et al., Studies of Relationship between Petrography and Elemental Analysis with Grindability for Kentucky Coals, Fuel 87 (2008), 6, pp. 707-713
  10. Stojiljkovic, D., Ercegovac, M., Radovanovic, M., Characterization of the Solid Residue from Low Rank Coal Combustion, Acta Universitatis Carolinae - Geologica, 45 (2001), 2-4, pp. 125-130

© 2021 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