||Modification of Optical Instruments for In-Stack Monitoring of Particle Size.
Wertheimer, A. L. ;
||Leeds and Northrup Co., North Wales, PA.;Environmental Protection Agency, Research Triangle Park, NC. Office of Research and Development.
Air pollution ;
Optical measuring instruments ;
Particle size ;
Field tests ;
Electric power plants ;
Industrial wastes ;
Combustion products ;
Light scattering ;
Coal fired power plants ;
Air pollution detection
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A light scattering instrument for in-situ measurements of particles in the 0.2 to 20 micrometer diameter size range is described, and field test results are presented. The instrument is a modified version of an earlier prototype. The upper limit of the size response has been extended from 10 to 20 micrometers, and several component and packaging changes have been incorporated to make the unit more suited to stack particulate emission survey applications. The completed instrument was tested at a coal-fired electric power generating facility. During the test a cascade impactor was used as a referee device and both instruments were run side by side in the outlet duct of the electrostatic precipitator. Results show an excellent correlation between the two instruments with regard to the identification of a 1 micrometers diameter peak in the particle size distribution. A second peak around 20 micrometers was defined by the optical instrument, but could not conclusively be confirmed through the impactor data. The optical instrument handled well during the field test.