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Composition and properties of fly ash collected from a multifuel fluidized bed boiler co-firing refuse derived fuel (RDF) and hard coal

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  • Mlonka-Mędrala, Agata
  • Dziok, Tadeusz
  • Magdziarz, Aneta
  • Nowak, Wojciech

Abstract

In Poland, Refuse Derived Fuel (RDF) potential is significant, but high heterogeneity and contamination of the fuel limit its direct use in power industry. In this work samples were collected from a real-scale multifuel unit co-firing RDF with hard coal. Fuel samples and fly ashes collected from secondary cyclone and from bag filter were analysed in details. The thermal behaviour of fly ashes was investigated using X-ray diffraction (XRD), simultaneous thermal analysis (STA) and high-temperature microscope. High content of calcium compounds in both ash samples was noted. To determine the influence of flue gas treatment installation on the ash morphology and composition, Scanning Electron Microscopy with Energy Dispersive Spectroscopy (SEM-EDS) was used. Fly ash after flue gas treatment (FGT) system was much finer and higher content of heavy metals was observed. The mass distribution of mercury and leachability of selected heavy metals from the fly ashes were performed for the analysed unit. The concentration of mercury was several times higher in case of first collected fly ash due to longer contact time of flue gases with ash. Fly ashes contained high amounts of copper, lead and vanadium, but leachability of analysed metals was lower in case of bag filter ash.

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  • Mlonka-Mędrala, Agata & Dziok, Tadeusz & Magdziarz, Aneta & Nowak, Wojciech, 2021. "Composition and properties of fly ash collected from a multifuel fluidized bed boiler co-firing refuse derived fuel (RDF) and hard coal," Energy, Elsevier, vol. 234(C).
    • Handle: RePEc:eee:energy:v:234:y:2021:i:c:s0360544221014778
    DOI: 10.1016/j.energy.2021.121229
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    2. Shizhang Wang & Junjie Wang & Yu Zhang & Linhan Dong & Heming Dong & Qian Du & Jianmin Gao, 2023. "Effect of External Mineral Addition on PM Generated from Zhundong Coal Combustion," Energies, MDPI, vol. 16(2), pages 1-24, January.
    3. Marcelina Bury & Tadeusz Dziok & Karel Borovec & Piotr Burmistrz, 2023. "Influence of RDF Composition on Mercury Release during Thermal Pretreatment," Energies, MDPI, vol. 16(2), pages 1-13, January.
    4. Botakoz Suleimenova & Berik Aimbetov & Daulet Zhakupov & Dhawal Shah & Yerbol Sarbassov, 2022. "Co-Firing of Refuse-Derived Fuel with Ekibastuz Coal in a Bubbling Fluidized Bed Reactor: Analysis of Emissions and Ash Characteristics," Energies, MDPI, vol. 15(16), pages 1-11, August.
    5. Santa Margarida Santos & Catarina Nobre & Paulo Brito & Margarida Gonçalves, 2023. "Brief Overview of Refuse-Derived Fuel Production and Energetic Valorization: Applied Technology and Main Challenges," Sustainability, MDPI, vol. 15(13), pages 1-22, June.
    6. Kalisz, Sylwester & Wejkowski, Robert & Maj, Izabella & Garbacz, Przemysław, 2023. "A novel approach to the dry desulfurization process by means of sodium bicarbonate: A full-scale study on SO2 emission and geochemistry of fly ash," Energy, Elsevier, vol. 279(C).

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