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Modified Fly Ash-Based Adsorbents (MFA) for Mercury and Carbon Dioxide Removal from Coal-Fired Flue Gases

Author

Listed:
  • Marta Marczak-Grzesik

    (Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicz Avenue 30, 30-059 Krakow, Poland
    AGH Centre of Energy, AGH University of Science and Technology, Czarnowiejska 36, 30-054 Krakow, Poland)

  • Piotr Piersa

    (Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland)

  • Mateusz Karczewski

    (Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicz Avenue 30, 30-059 Krakow, Poland)

  • Szymon Szufa

    (Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland)

  • Hilal Ünyay

    (Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland
    Department of Environmental Engineering, Akdeniz University, Antalya 07070, Turkey)

  • Aleksandra Kędzierska-Sar

    (Faculty of Process and Environmental Engineering, Lodz University of Technology, Wolczanska 213, 90-924 Lodz, Poland)

  • Piotr Bochenek

    (Faculty of Energy and Fuels, AGH University of Science and Technology, Mickiewicz Avenue 30, 30-059 Krakow, Poland
    AGH Centre of Energy, AGH University of Science and Technology, Czarnowiejska 36, 30-054 Krakow, Poland)

Abstract

One of the solid waste produced during the combustion of coal are fly ashes. Disposal challenges and environmental consequences are the results of significant process yield and atmospheric emission of fly ashes. The exact chemical composition of FA depends mainly on the type of utilised fuel and combustion conditions. It consists mainly of chemically stable metal oxides, such as Al 2 O 3 , Fe 2 O 3 , SiO 2 , CaO, MgO, K 2 O, Na 2 O and TiO 2 , but its toxicity is related to the possible presence of some trace elements, such as As, Hg, Cd, Se and Cr. The chemical and physical properties of fly ash (e.g., particle size distribution, porosity, and surface area) make it suitable as an adsorbent to remove various impurities from process flows such as flue gas stream. Its suitability for capturing mercury from flue gas was experimentally confirmed due to its abundant supply, particle size, bulk density, porosity, chemical composition and low cost. Hence, the use of fly ash as adsorbents and precursors for the production of heavy metal adsorbents is of great practical importance, as it reduces the cost of mercury capture and alleviates the problems associated with the disposal of solid waste. Studies showed that the chemical components present in fly ash additives could stimulate catalytic oxidative capacity, which increases the adsorption of Hg 0 oxidation and adsorption of both Hg and CO 2 . The presented study analysed fly ashes from different zones of the electrostatic precipitator and verified their suitability for removing impurities from flue gases, i.e., mercury and carbon dioxide. The results outlined modified fly ash as having good Hg and CO 2 removal capabilities. The adsorption efficiency of Hg reached 92% for Hg and 66% for CO 2 , while untreated fly ash reached 67% for Hg and 59% for CO 2 .

Suggested Citation

  • Marta Marczak-Grzesik & Piotr Piersa & Mateusz Karczewski & Szymon Szufa & Hilal Ünyay & Aleksandra Kędzierska-Sar & Piotr Bochenek, 2021. "Modified Fly Ash-Based Adsorbents (MFA) for Mercury and Carbon Dioxide Removal from Coal-Fired Flue Gases," Energies, MDPI, vol. 14(21), pages 1-13, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:21:p:7101-:d:669507
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    References listed on IDEAS

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    1. Grzegorz Wielgosiński & Justyna Czerwińska & Szymon Szufa, 2021. "Municipal Solid Waste Mass Balance as a Tool for Calculation of the Possibility of Implementing the Circular Economy Concept," Energies, MDPI, vol. 14(7), pages 1-25, March.
    2. Zdzislawa Romanowska-Duda & Szymon Szufa & Mieczysław Grzesik & Krzysztof Piotrowski & Regina Janas, 2021. "The Promotive Effect of Cyanobacteria and Chlorella sp. Foliar Biofertilization on Growth and Metabolic Activities of Willow ( Salix viminalis L.) Plants as Feedstock Production, Solid Biofuel and Bio," Energies, MDPI, vol. 14(17), pages 1-21, August.
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    2. Yang, Yuxuan & Zhong, Zhaoping & Li, Jiefei & Du, Haoran & Li, Qian & Zheng, Xiang & Qi, Renzhi & Zhang, Shan & Ren, Pengkun & Li, Zhaoying, 2023. "Experimental and theoretical-based study of heavy metal capture by modified silica-alumina-based materials during thermal conversion of coal at high temperature combustion," Applied Energy, Elsevier, vol. 351(C).
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