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    Aggregate-Related Applications for Residues from Fluidized Bed Combustion Boilers

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    Continuing development of atmospheric fluidized bed (AFB) combustion systems offers great potential for producing energy from low quality coals and other combustible materials in an environmentally acceptable manner. The process involves burning the crushed coal in a bed of limestone or dolomite that has been fluidized by jets of hot air. The resultant by-products are a dry, sand-size spent bed residue and a relatively high carbon fly ash. Potential aggregate-related applications for these by-products, and in particular the spent bed residue, are discussed.

    This paper is a further progress report for a research program sponsored by the U.S. Department of Energy to evaluate potential commercial applications for fluidized bed combustion wastes. Included in this paper are laboratory data related to a number of different AFB by-product sources; a summary of separation efficiencies of several beneficiation techniques; and supporting data related to three of the most promising applications for spent bed residues. These applications are stabilized road base compositions, masonry block, and synthetic aggregate. Data pertaining to laboratory studies and small-scale field demonstrations for each of these applications is presented and discussed.


    aggregates, concrete, fluidized bed, solid waste, coal-associated waste, combustion, waste utilization, limestone, road base, masonry block, synthetic aggregate

    Author Information:

    Collins, RJ
    Executive vice president, Valley Forge Laboratories, Inc., Devon, Pa.

    Committee/Subcommittee: D04.04

    DOI: 10.1520/STP32454S