Effects of calcium/iron-rich sludge on the ash fusion characteristics of sugarcane bagasse under oxygen-enriched atmosphere

Ziqiang Yang, Chuanxiang Zhang, Fenghai Li, Xuefei Liu, Meijie Zhou and Yitian Fang

Energy, 2025, vol. 324, issue C

Abstract: The co-combustion of sludge presents a promising approach to mitigate the ash-related problems of biomass. The novelties of the study were to investigate the influence and mechanisms of calcium-rich paper industry sludge (PIS) or iron-rich coking plant sludge (CPS) on the ash fusion temperature (AFT) of sugarcane bagasse (SB) from the perspective of mineral migration. The low-temperature eutectic formation between alkali metals and silica in SB was the primary factor of its low AFT. The deformation temperature of the mixed SB exceeded 1100 °C when the mass ratio of PIS or CPS ash was 30 % and 40 %, respectively. The formation of high melting point (MP) calcium-containing minerals (e.g., Ca5(PO4)3OH, Ca2Al2SiO7, Ca7Mg(SiO4)4, and Ca2MgSi2O7) with the addition of PIS ash caused the increases in the SB AFT. With the CPS ash mass ratio increased, the generation of high MP minerals (e.g., Fe2O3, Fe3O4, and KAlSi3O8) resulted in an increase in the mixtures AFT. The silicate network structure was disrupted by single charge cations (e.g., K+, Na+) and then replaced by double charge cations (e.g., Ca2+, Mg2+), which enhanced the network stability. FactSage also explained the AFT variations in mixtures. This provided a reference for solving ash related problems during biomass combustion.

Keywords: Sugarcane bagasse; Calcium/iron-rich sludge; Ash fusion characteristics; Co-combustion; Mineral transformation (search for similar items in EconPapers)
Date: 2025
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Persistent link: https://EconPapers.repec.org/RePEc:eee:energy:v:324:y:2025:i:c:s0360544225014501

DOI: 10.1016/j.energy.2025.135808

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