Ash deposition of a Spanish anthracite: effects of included and excluded mineral matter |
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Authors: | Nigel V Russell Lily B MéndezFraser Wigley Jim Williamson |
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Affiliation: | a Department of Materials, Imperial College, Prince Consort Road, London SW7 2BP, UK b INCAR, CSIC, La Corredoria s/n. Ap. 73, 33080 Oviedo, Spain |
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Abstract: | This study has been undertaken to provide an insight into the effects of mineral matter distributions in coal on the nature of boiler slags formed during the combustion of a high ash Spanish anthracite. Three density fractions were prepared, and the light and heavy fractions were combined to give a sample containing mainly excluded mineral matter. The mineral matter in the medium density fraction was predominantly included. Slag deposits were prepared in the laboratory from the whole coal, the light+heavy and medium density fractions. The coal with excluded mineral matter was found to produce a slag similar in nature and chemistry to the whole coal ash deposit. The coal with included mineral matter produced a vitreous, iron-rich deposit. The deposits were compared with slags, obtained from a Spanish power station boiler, burning a blend containing the same anthracite. |
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Keywords: | Anthracite Ash deposition Density fractions Included and excluded mineral matter |
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