Abstract
The 165 MWe circulating fluidized bed boiler at the Nova Scotia Power Inc. (NSPI) Point Aconi Generating Station, located in eastern Cape Breton Island, Nova Scotia, is Canada’s largest fluidized bed unit. Fluidized bed combustion (FBC) allows the burning of high sulphur (S) fuels with in situ capture of S (removal of SO2). The lower operating temperature of the FBC system (870 C versus 2000 C for pulverized coal boilers) permits the combustion of a wide range of ‘opportunity’ fuels (e.g., petroleum coke , low grade coals, tires, and wood waste sludge) in an environmentally acceptable manner. The use of large amounts of a limestone sorbent in FBC results in a high rate of sulphur capture (90%), however, the rate of residue production is approximately two-times higher than that from conventional pulverized coal-fired boilers. While the residue is currently disposed in a fully engineered residue management site, there are environmental, financial, and other incentives for NSPI to fmd beneficial uses for the residue to minimize placement of the by-product in the landfill.
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