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

Ha-Na Jang, Heung-Min Yoo and Hang Seok Choi ()
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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

Energies, 2022, vol. 16, issue 1, 1-13

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.

Keywords: waste sewage sludge; oxy-fuel combustion; circulating fluidized bed; particle size distribution; alkali and heavy metals (search for similar items in EconPapers)
JEL-codes: Q Q0 Q4 Q40 Q41 Q42 Q43 Q47 Q48 Q49 (search for similar items in EconPapers)
Date: 2022
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