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DESIGN AND CHARACTERIZATION OF AN ULTRAFINE COAL ASH AEROSOL GENERATOR FOR DIRECT ANIMAL EXPOSURE STUDIES
Citation:
YOO, J., W. P. LINAK, T. SHINAGAWA, M. I. GILMOUR, AND J. O. WENDT. DESIGN AND CHARACTERIZATION OF AN ULTRAFINE COAL ASH AEROSOL GENERATOR FOR DIRECT ANIMAL EXPOSURE STUDIES. In Proceedings, 25th Annual International Conference on Incineration and Thermal Treatment Technologies (IT3), Savannah, GA, May 18, 2006. AWMA, Pittsburgh, PA, NA, (2006).
Description:
Primary ultrafine particulate matter (PM) is produced during pulverized coal combustion by the nucleation and heterogeneous condensation of vapor-phase species. This differs from the mechanisms that control the formation of the supermicron fly ash that is heavily influenced by the fragmentation and coalescence of aluminosilicate phases derived from clay minerals in the coal. Although the ultrafine fraction typically represents much less than 1% of the total fly ash mass, this fraction dominates the particle number concentrations and exhibits reduced collection efficiency through particulate control systems. This paper describes the design and characterization of an ultrafine coal ash generator that can be used for direct animal inhalation exposure studies. Extracted PM samples have been characterized by scanning electron microscopy and X-ray fluorescence spectroscopy.