International Scientific Journal


The preliminary thermogravimetric studies of co-pyrolyzed low rank coals (lignites Kostolac and Kolubara) with waste materials (spent coffee ground and waste rubber granulate) in a form of blends have been performed. Thermal analysis measurements of blend samples were carried out in a nitrogen, atmosphere at three different heating rates of 10, 15, and 20 K per minute. The coal-waste blends were prepared in the percentage ratios of 90:10, 80:20, and 70:30. This work analyzed the synergy analysis for considered blends shown via descriptive parameters during co-pyrolysis process. According to the performed analysis, the presence of synergistic effect was identified, where strong interactions were also observed. For lignite-spent coffee ground blends, it was found that two factors which affect the synergy effect with coal are concentration of added biomass material and the heating rate. For lignite-tire rubber granulate blends, the blending ratio take on a decisive role for positive consequences of a synergistic effect (ratios below 30% of tire rubber granulate in coals are desirable). Also, in this work the influence of micro-scale condition parameters such as heating rate (as the experimental regulatory factor) was analyzed on the magnitude response of synergism during co-pyrolysis.
PAPER REVISED: 2021-10-01
PAPER ACCEPTED: 2021-10-04
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THERMAL SCIENCE YEAR 2022, VOLUME 26, ISSUE Issue 3, PAGES [2211 - 2224]
  1. ***, Energy Sector Development Strategy of the Republic of Serbia for the period by 2025 with projections by 2030 in, Republic of Serbia, Ministry of Mining and Energy, Department for strategic planning in energy sector, Belgrade, Serbia, 2016, pp. 98.
  2. D. Jie, X. Xu, F. Guo, The future of coal supply in China based on non-fossil energy development and carbon price strategies, Energy, 220 (2021) 119644.
  3. H. Neofytou, A. Nikas, H. Doukas, Sustainable energy transition readiness: A multicriteria assessment index, Renew. Sustain. Energy Rev., 131 (2020) 109988.
  4. H. Merdun, Z.B. Laougé, Kinetic and thermodynamic analyses during co-pyrolysis of greenhouse wastes and coal by TGA, Renewable Energy, 163 (2021) 453-464.
  5. D. Tokmurzin, B. Kuspangaliyeva, B. Aimbetov, B. Abylkhani, V. Inglezakis, E.J. Anthony, Y. Sarbassov, Characterization of solid char produced from pyrolysis of the organic fraction of municipal solid waste, high volatile coal and their blends, Energy, 191 (2020) 116562.
  6. A. Khan, J. Akhtar, K. Shahzad, N. Sheikh, S. Munir, Co-pyrolysis and hyrdogenation of waste tires and thar coal blends, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 39 (2017) 1664-1670.
  7. A. Kanca, Investigation on pyrolysis and combustion characteristics of low quality lignite, cotton waste, and their blends by TGA-FTIR, Fuel, 263 (2020) 116517.
  8. M.M. Životić, M.R. Trninić, N.G. Manić, D.D. Stojiljković, A.M. Jovović, Modeling devolatalization process of Serbian lignites using chemical percolation devolatilization model, Thermal Science, 23 (2019) 1543-1557.
  9. A. Oyedun, K.-L. Lam, M. Fittkau, C.-W. Hui, Optimisation of particle size in waste tyre pyrolysis, Fuel, 95 (2012) 417-424.
  10. ISO 5068-2 Brown coals and lignites - Determination of moisture content - Part 2: Indirect gravimetric method for moisture in the analysis sample, in, International Organization for Standardization, 2014.
  11. ISO 5071-1 Brown coals and lignites - Determination of the volatile matter in the analysis sample - Part 1: Two furnace method, in, International Organization for Standardization, 2013.
  12. ISO 1171 Solid mineral fuels - Determination of ash content, in, International Organization for Standardization, 2010.
  13. SRPS EN ISO 18134-3 Solid biofuels - Determination of moisture content - Oven dry method - Part 3: Moisture in general analysis sample, in, 2017.
  14. SRPS EN ISO 18123 Solid biofuels - Determination of the content of volatile matter, in, 2017.
  15. SRPS EN ISO 18122 Solid biofuels - Determination of ash content, in, 2017.
  16. ISO 1928 Solid mineral fuels - Determination of gross calorific value by the bomb calorimetric method, and calculation of net calorific value, in, International Organization for Standardization, 2015.
  17. B. Han, Y. Chen, Y. Wu, D. Hua, Z. Chen, W. Feng, M. Yang, Q. Xie, Co-pyrolysis behaviors and kinetics of plastics-biomass blends through thermogravimetric analysis, Journal of Thermal Analysis and Calorimetry, 115 (2014) 227-235.
  18. D.R. Vardon, B.R. Moser, W. Zheng, K. Witkin, R.L. Evangelista, T.J. Strathmann, K. Rajagopalan, B.K. Sharma, Complete utilization of spent coffee grounds to produce biodiesel, bio-oil, and biochar, ACS Sustainable Chemistry & Engineering, 1 (2013) 1286-1294.
  19. E. Biagini, F. Lippi, L. Petarca, L. Tognotti, Devolatilization rate of biomasses and coal-biomass blends: an experimental investigation, Fuel, 81 (2002) 1041-1050.
  20. A. Demirbas, Effects of moisture and hydrogen content on the heating value of fuels, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 29 (2007) 649-655.
  21. A. Demirbas, Relationships between heating value and lignin, moisture, ash and extractive contents of biomass fuels, Energy exploration & exploitation, 20 (2002) 105-111.
  22. Z. Wu, S. Wang, J. Zhao, L. Chen, H. Meng, Synergistic effect on thermal behavior during co-pyrolysis of lignocellulosic biomass model components blend with bituminous coal, Bioresour. Technol., 169 (2014) 220-228.
  23. I. Suelves, R. Moliner, M. Lazaro, Synergetic effects in the co-pyrolysis of coal and petroleum residues: influences of coal mineral matter and petroleum residue mass ratio, J. Anal. Appl. Pyrolysis, 55 (2000) 29-41.
  24. P. Acar, A. Sinağ, Z. Misirlioğlu, M. Canel, The pyrolysis of scrap tire with lignite, Energy Sources, Part A: Recovery, Utilization, and Environmental Effects, 34 (2011) 287-295.
  25. A. Sınaǧ, M. Sungur, M. Güllü, M. Canel, Characterization of the liquid phase obtained by copyrolysis of Mustafa Kemal Paşa (MKP) lignite (Turkey) with low density polyethylene, Energy Fuels., 20 (2006) 2093-2098.

© 2022 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