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Production of Low-Mercury Solid Fuel by Mild Pyrolysis Process

Author

Listed:
  • Tadeusz Dziok

    (Faculty of Energy and Fuels, AGH University of Science and Technology, Al. A. Mickiewicza 30, 30-059 Krakow, Poland)

Abstract

Mercury is considered one of the most harmful ecotoxic elements. A main source of its anthropogenic emissions is fuel combustion. For fuels with a high mercury content, costly methods are required to remove mercury from the flue gases. The solution to this problem is to remove mercury from the fuel before combustion. This can be achieved by a mild pyrolysis process. Solid fuel samples with relatively high mercury content were examined. These included waste (refuse-derived fuel, paper, sewage sludge, and rubber), waste wood biomass (hornbeam leaves, pine and spruce bark), and six coal. The mild pyrolysis process was performed at 300 °C in an argon flow of 500 cm 3 /min. The residence time was 30 min. Proximate and ultimate analysis (including mercury content) was conducted for raw fuels and chars. The process allowed a significant reduction in mercury content from 36 to 97%. Mercury was most easily removed from biomass and waste with the most difficult being from coal. The effectiveness of mercury removal was determined by the type of fuel and its mercury content. The mercury content in the obtained chars was 0.05–3.4 µg Hg/MJ. The use of such chars will meet current EU emission standards and those to be introduced in the future.

Suggested Citation

  • Tadeusz Dziok, 2023. "Production of Low-Mercury Solid Fuel by Mild Pyrolysis Process," Energies, MDPI, vol. 16(7), pages 1-12, March.
    • Handle: RePEc:gam:jeners:v:16:y:2023:i:7:p:3046-:d:1108605
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    References listed on IDEAS

    as
    1. Edyta Misztal & Tomasz Chmielniak & Izabela Mazur & Marcin Sajdak, 2022. "The Release and Reduction of Mercury from Solid Fuels through Thermal Treatment Prior to Combustion," Energies, MDPI, vol. 15(21), pages 1-12, October.
    2. 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.
    3. Xiaohang Li & Yang Teng & Kai Zhang & Hao Peng & Fangqin Cheng & Kunio Yoshikawa, 2020. "Mercury Migration Behavior from Flue Gas to Fly Ashes in a Commercial Coal-Fired CFB Power Plant," Energies, MDPI, vol. 13(5), pages 1-15, February.
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