Abstract
The report describes the modification of a massive volume air sampler (MVAS) to collect fly ash emissions from the stack mouth of an experimental fluidized bed combustor. High volume filter fly ash samples and laboratory size cascade impactor samples were simultaneously obtained to verify the operation of the MVAS. Due to the large quantity of size-classified fly ash it was possible to characterize its physicochemical and biological properties as a function of particle size. Results show that the bulk density of the FBC fly ash was independent of the particle size. Although the MVAS collects fly ash fractions with considerable overlap, the trend toward higher mutagenic activity in the smaller size fraction noted in previous studies of fly ash was present. As the MVAS does have a large capacity, relatively large quantities of ash can be collected within reasonable sampling times. With appropriate dilution even hot gas streams can be sampled at near ambient temperatures.
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