Abstract
A 1 m 2 pilot-scale bubbling fluidized bed combustor at Point Tupper, Nova Scotia, was operated for about 11,000 h to investigate high temperature corrosion phenomena in coal-fired fluidized bed combustion. During the second last 1000 h segment of this program, in July 1985, the 0 2 , CO 2 , CO, NOx and SO2 bed and freeboard were measured by extractive concentration profiles in the gas sampling, under a contract sponsored by Energy, Mines and Resources Canada (EMR). Highly reducing zones were found near the coal feed nozzle and it be- A came apparent that a windbox leak was permitting some of the combustion air to bypass the fluidizing bed. However, the gas species profiles were consistent with those predicted by the plume model of Park, Levenspiel and Fitzgerald. Subsequently, results obtained from a Nova Scotia Power Corporation (NSPC) extractive gas sampling program became available and these are also presented. Although these show greater variations than those observed in the study for EMR the results of the two studies are in broad agreement. In addition, the NSPC results include measurements taken during the final 1000 h segment of the program for which the windbox leak was sealed. As expected, s the gas concentrations then demonstrated considerably more uniform profiles.
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