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Circulating fluidized bed combustion of a high-sulphur eastern canadian coal
Authors:C M H Brereton  C J Lim  R Legros  J Zhao  H Li  J R Grace
Abstract:Combustion tests were carried out with Minto coal in combination with three different limestones in the University of British Columbia (UBC) pilot scale (152 mm square x 7.3 m tall) circulating fluidized bed combustion (CFBC) unit. Operating conditions were chosen to be typical of those employed in large-scale CFBC power boilers. Recycling of fine particles captured by the secondary cyclone was found to be of considerable importance in increasing sulphur capture, enhancing combustion efficiency and reducing the amount of calcium sulphide in the solids residues. NOx emissions increased as the Ca:S ratio increased. Local gas concentrations inside the reactor were strongly influenced by the core-annulus solids distribution patterns which characterize circulating fluidized beds.
Keywords:fluidization  combustion  circulating fluidized bed  coal  NOx  sulphur capture
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