Abstract
Two-component model aerosols consisting of KCl vapor and ultrafine K2SO4 particles were generated in the laboratory to study sample behavior in a high-temperature porous tube sampling probe. The conditions were set to represent those typically occurring at biomass-fired furnaces. Particle size distributions were measured from the diluted aerosol via several sampling parameters and the temperature and mixing conditions inside the diluting probe were characterized. The experimental findings were interpreted by one-dimensional aerosol dynamics modeling. Gaseous KCl was found to form very small KCl particles inside the diluter by homogeneous nucleation. In the cases where K2SO4 seed particles were introduced into the sample, part of the KCl vapor condensed on the seeds, while the remainder formed a clearly distinct nucleation mode due to the relatively high cooling rates in the probe. In the studied probe, mixing of sample and dilution gas was relatively fast, which was found to be favorable for KCl nucleatio...
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