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Particle Size Distribution and Enrichment of Alkali and Heavy Metals in Fly Ash on Air and Oxy-Fuel Conditions from Sludge Combustion

Author

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  • Ha-Na Jang

    (Department of Environmental Engineering, Yonsei University, Wonju 26493, Republic of Korea)

  • Heung-Min Yoo

    (Resource Recirculation Research Division, National Institute of Environmental Research, Inchon 22689, Republic of Korea)

  • Hang Seok Choi

    (Department of Environmental Engineering, Yonsei University, Wonju 26493, Republic of Korea)

Abstract

Comparative tests in air and oxy-fuel combustion were conducted in a 30 kW th circulating fluidized bed (CFB) pilot plant for waste sludge combustion. General combustion characteristics of the CFB, such as pressure profiles, temperatures along the bed, and flue gas composition, were different under the air and oxy-fuel conditions. At the bottom and in the fly ash, alkali and heavy metals had different distributions under the air and oxy-fuel combustion conditions. The particle size distribution in fly ash from air combustion was dominated by coarse particles, over 2.5 μm in size, whereas with oxy-fuel combustion, most particles were submicron in size, approximately 0.1 μm, and a smaller quantity of coarse particles, over 2.5 μm in size, formed than with air combustion. Mass fractions of Al, Ca, and K, below 2.5 μm in size, were found in the ashes from oxy-fuel combustion and in higher quantity than those found in air combustion. Submicron particle formation from Cr, Ni, Cu, and Zn in the fly ash occurred more during oxy-fuel combustion than it did in air combustion.

Suggested Citation

  • Ha-Na Jang & Heung-Min Yoo & Hang Seok Choi, 2022. "Particle Size Distribution and Enrichment of Alkali and Heavy Metals in Fly Ash on Air and Oxy-Fuel Conditions from Sludge Combustion," Energies, MDPI, vol. 16(1), pages 1-13, December.
    • Handle: RePEc:gam:jeners:v:16:y:2022:i:1:p:145-:d:1012750
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    References listed on IDEAS

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    1. Wu, Yinghai & Wang, Chunbo & Tan, Yewen & Jia, Lufei & Anthony, Edward J., 2011. "Characterization of ashes from a 100kWth pilot-scale circulating fluidized bed with oxy-fuel combustion," Applied Energy, Elsevier, vol. 88(9), pages 2940-2948.
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