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Properties and Environmental Considerations Related to AFBC Solid Residues

Published online by Cambridge University Press:  25 February 2011

E. E. Berry  and
E. J. Anthony
E. E. Berry
Affiliation:
PO Box 7261, Oakville, Ontario, Canada
E. J. Anthony
Affiliation:
E.J. Anthony, CANMET, Energy Mines and Resources Canada, Ottawa, Ontario, Canada
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Abstract

Atmospheric-pressure fluidized bed combustion (AFBC) produces solid residues that are different from the familiar pulverized coal ashes. When limestone beds are used to adsorb SOx, high-Ca residues, comprised largely of CaO and SO4, are produced. Leachates from high-Ca AFBC residues are strongly alkaline (pH >11) and contain high levels of dissolved solids (TDS >3000 mg/L). If water is added during handling, hydration of CaO may cause a temperature rise and hydration of CaSO4 may result in premature hardening of the residues. Trace elements and organic components may leach from disposal sites. This paper presents an overview of the nature of AFBC residues and the factors influencing their disposal.

Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 86: Symposium N – Fly Ash and Coal Conversion By-Products III , 1986 , 49
Copyright
Copyright © Materials Research Society 1987

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References

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