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Thermal properties of waste fuels for the circular economy

Author

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  • Kijo-Kleczkowska, A.
  • Szumera, M.
  • Rutkowski, P.
  • Krzywanski, J.

Abstract

The aim of this article is to determine the thermal conductivity of selected coal waste and fly ashes during pyrolysis to a temperature of 600 °C and compare it with five coals. As is known, the thermal conductivity of materials depends on their density, thermal diffusivity, and specific heat capacity. Thermal properties were determined using thermal analysis, laser flash analysis, helium pycnometry, and dilatometry, and thermal conductivity was calculated from experimentally determined parameters. The novelty of this study was the comprehensive comparative analysis of the thermal properties of selected fuels and waste under unified laboratory conditions. This data is lacking in the literature. For comparison, thermophysical properties of agro- and forest-biomass waste at 25 °C and the temperature-dependent evolution of their specific heat capacity during pyrolysis are also presented. In subsequent research, the authors will analyze additional thermal properties of the biomass waste up to higher temperatures.

Suggested Citation

  • Kijo-Kleczkowska, A. & Szumera, M. & Rutkowski, P. & Krzywanski, J., 2026. "Thermal properties of waste fuels for the circular economy," Energy, Elsevier, vol. 344(C).
    • Handle: RePEc:eee:energy:v:344:y:2026:i:c:s0360544226001799
    DOI: 10.1016/j.energy.2026.140077
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    References listed on IDEAS

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    1. Kijo-Kleczkowska, Agnieszka & Gajek, Marcin & Krzywanski, Jaroslaw & Gnatowski, Adam & Knaś, Krzysztof & Szumera, Magdalena & Nowak, Wojciech, 2025. "Novel insights into co-pyrolysis: kinetic, thermodynamic, and AI perspectives," Energy, Elsevier, vol. 326(C).
    2. Ewa Syguła & Kacper Świechowski & Małgorzata Hejna & Ines Kunaszyk & Andrzej Białowiec, 2021. "Municipal Solid Waste Thermal Analysis—Pyrolysis Kinetics and Decomposition Reactions," Energies, MDPI, vol. 14(15), pages 1-27, July.
    3. Kijo-Kleczkowska, Agnieszka & Gnatowski, Adam & Krzywanski, Jaroslaw & Gajek, Marcin & Szumera, Magdalena & Tora, Barbara & Kogut, Krzysztof & Knaś, Krzysztof, 2024. "Experimental research and prediction of heat generation during plastics, coal and biomass waste combustion using thermal analysis methods," Energy, Elsevier, vol. 290(C).
    4. Piotr Soprych & Grzegorz Czerski, 2025. "The Use of Biomass Ash as a Catalyst in the Gasification Process—A Review," Energies, MDPI, vol. 18(21), pages 1-36, October.
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