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Analysis of Polycyclic Aromatic Hydrocarbon Content in Ash from Solid Fuel Combustion in Low-Power Boilers

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  • Ewa Szatyłowicz

    (Department of Technology in Environmental Engineering, Faculty of Civil and Environmental Sciences, Bialystok University of Technology, Wiejska 45A, 15-351 Bialystok, Poland)

  • Wojciech Walendziuk

    (Department of Electrical Engineering, Power Electronics and Electrical Power Engineering, Faculty of Electrical Engineering, Bialystok University of Technology, Wiejska 45A, 15-351 Bialystok, Poland)

Abstract

The production of thermal energy is one of the sources of environmental pollution, especially when it uses traditional fossil fuels (in particular hard and brown coal). Burning conventional fuels contributes to air pollution because of emitting gases and producing waste after the process of burning in the form of ash. The work below was aimed at determining the indirect emission of PAHs in the form of fly ash, depending on the type of fuel burned. The conducted research showed which solid fuel combustion content leaves the lowest content of PAH in the fly ash. This work contains the analysis and assessment of the content of 16 PAHs (polycyclic aromatic hydrocarbons) in fly ash from the combustion of five selected solid fuels in low-power boilers. The following fuels were chosen for the research: hard coal with granulation above 60 mm, coal with the grain size of 25–80 mm, coal with the grain size of 8–25 mm, pellets with the grain size of 6 mm, and mixed dry wood. The results of the research showed that the most frequent and most concentrated compounds were naphthalene and acenaphthylene from the PAH group. These hydrocarbons have the smallest number of rings in a molecule. It was also found that the content of the LMW (Low Molecular Weight Polycyclic Aromatic Hydrocarbons) fractions in the fly ash from the analyzed fuels in ∑PAHs exceeds 57% in the case of 6 mm pellets and in the case of the ash from wood and hard coal when the grain size >60 mm. The opposite dependence can be observed in the case of the HMW (High Molecular Weight Polycyclic Aromatic Hydrocarbons) fraction.

Suggested Citation

  • Ewa Szatyłowicz & Wojciech Walendziuk, 2021. "Analysis of Polycyclic Aromatic Hydrocarbon Content in Ash from Solid Fuel Combustion in Low-Power Boilers," Energies, MDPI, vol. 14(20), pages 1-17, October.
    • Handle: RePEc:gam:jeners:v:14:y:2021:i:20:p:6801-:d:659184
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    References listed on IDEAS

    as
    1. Aneta Szymajda & Grażyna Łaska & Magdalena Joka, 2021. "Assessment of Cow Dung Pellets as a Renewable Solid Fuel in Direct Combustion Technologies," Energies, MDPI, vol. 14(4), pages 1-15, February.
    2. Liu, Zhengang & Quek, Augustine & Parshetti, Ganesh & Jain, Akshay & Srinivasan, M.P. & Hoekman, S. Kent & Balasubramanian, Rajasekhar, 2013. "A study of nitrogen conversion and polycyclic aromatic hydrocarbon (PAH) emissions during hydrochar–lignite co-pyrolysis," Applied Energy, Elsevier, vol. 108(C), pages 74-81.
    3. Ewa Szatyłowicz & Iwona Skoczko, 2019. "Evaluation of the PAH Content in Soot from Solid Fuels Combustion in Low Power Boilers," Energies, MDPI, vol. 12(22), pages 1-13, November.
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    Keywords

    PAH; fly ash; solid fuel; combustion;
    All these keywords.

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