Characterization and Use of Fluidized‐Bed‐Combustion Coal Ash
Publication: Journal of Environmental Engineering
Volume 120, Issue 6
Abstract
Fluidized‐bed‐combustion (FBC) technology will become more common as coal‐combustion systems are retrofitted to meet air‐emissions standards mandated by the 1991 Clean Air Act. FBC ash will present new challenges for coal‐combustion by‐product management. Calcium‐based sorbents added to the combustion system of FBC make the properties of the resulting ash different from electric‐utility fly ash. Recycling options, used to divert electric‐utility ash from landfills, will have to be reevaluated for FBC ash. FBC ash from Central Soya Company's circulating FBC boiler, previously located in Chattanooga, Tennessee, was sampled over a 2‐year period. The ash was analyzed for chemical and physical properties and evaluated as a concrete admixture. Results show that concrete strength and long‐term durability are compromised by substituting FBC ash for Portland cement. The high pozzolanic activity of the ash and the decrease in leachability of some constituents with increasing ash content in concrete suggest that FBC ash has potential to be a good material for hazardous‐waste solidification and stabilization.
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Information & Authors
Information
Published In
Journal of Environmental Engineering
Volume 120 • Issue 6 • November 1994
Pages: 1488 - 1506
Copyright
Copyright © 1994 American Society of Civil Engineers.
History
Received: Aug 5, 1992
Published online: Nov 1, 1994
Published in print: Nov 1994
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