Abstract
Biomass combustion generates considerable amounts of ash that are related to slagging/fouling problems in combustors. Numerous indices have been proposed in the literature for the evaluation of slagging/fouling tendencies. This paper is focused on the characterization of various biomass ashes in terms of their slagging/fouling tendency. For this purpose, the chemical composition of ash samples from fourteen solid biofuels (and a lignite sample as a reference) was analyzed by scanning electron microscope, energy-dispersive spectroscopy, ion chromatography and elemental analysis. Modification/normalization of the available ash indices was performed by taking into account not only the chemical composition of the ash but also the Gross Calorific Value of the fuels and the amount of the produced ash. Two versatile tools were developed, a total Ash Quality Index (tAQI) and an Ash Quality Label (AQL), in order to express the information derived from various indices with a single number or letter. The modified indices result in different characterization from the unmodified ones and lead to a more objective/fair evaluation of the slagging/fouling tendency. The comparison of large number of indices of large number of samples is enabled via the tAQI and the AQL. Samples with a tAQL ≤ 1 belong to class ‘A’ (low slagging/fouling problems) while samples with a tAQL > 6 belong to class ‘G’ (extremely high tendency to slagging/fouling problems). The tAQI and AQL are a novel concept for the categorization and labeling of solid biofuels regarding their slagging/fouling tendency and could contribute to the waste/biomass residue market for energy proposes.
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Acknowledgements
The authors would like to thank Dr. Lemonidou Angeliki and Mrs Ntampou Xanthi for assistance with ultimate analysis.
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This research is co-financed by Greece and the European Union (European Social Fund- ESF) through the Operational Programme «Human Resources Development. Education and Lifelong Learning» in the context of the project ‘Strengthening Human Resources Research Potential via Doctorate Research’ (MIS-5000432), implemented by the State Scholarships Foundation (ΙΚΥ).
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AV involved in conceptualization, investigation, methodology, data curation, interpretation, validation, formal analysis, performed the measurement, writing—original draft, writing—review & editing, visualization; LP took part in methodology and performed the measurement; SZ involved in writing—review & editing, and supervision; AI involved in writing—review & editing, and supervision. All authors read and approved the final manuscript.
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Highlights
• Development of a total novel Ash Quality Index (tAQI) for comparing solid fuel ashes.
• Development of an Ash Quality Label (AQL) for classification of solid fuel ashes.
• Normalized values of ash indices kg/GJ were used for the tAQI and AQL development.
• Evaluation of slagging / fouling characteristics of several agricultural residues.
• Characterization of agricultural residues ashes from Greece was performed
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Vasileiadou, A., Papadopoulou, L., Zoras, S. et al. Development of a total Ash Quality Index and an Ash Quality Label: Comparative analysis of slagging/fouling potential of solid biofuels. Environ Sci Pollut Res 29, 42647–42663 (2022). https://doi.org/10.1007/s11356-021-18225-4
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DOI: https://doi.org/10.1007/s11356-021-18225-4