The electrical properties of coal slag

The inorganic constituents of coal remaining after high temperature combustion in a MHD (Magnetohydrodynamic) power plant combustor form an iron-rich, “dirty” glass whose electrical properties are important in the operation of the MHD generator. In particular, alkali “seed” (K 2CO 3) is added to enh...

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Bibliographic Details
Published in:Journal of non-crystalline solids 1980-01, Vol.40 (1), p.197-208
Main Authors: Pollina, R., Larsen, Raymond, Westpfahl, David
Format: Article
Language:English
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Summary:The inorganic constituents of coal remaining after high temperature combustion in a MHD (Magnetohydrodynamic) power plant combustor form an iron-rich, “dirty” glass whose electrical properties are important in the operation of the MHD generator. In particular, alkali “seed” (K 2CO 3) is added to enhance the conductivity of the plasma so the slag layer which coats the walls and electrodes of the generator is rich in K 2O. We present results of a systematic study of the electrical conductivity of a Rosebud coal ash with graded amounts of K 2CO 3 added. At high temperatures, the conductivity curves are smooth with many ions contributing. At lower temperatures the curves become more complex with the presence of crystalline phases in the glass.
ISSN:0022-3093
1873-4812
DOI:10.1016/0022-3093(80)90103-9