Effects of Soot on Pyrometer Measured Temperatures in Pulverized-Coal Flames

Abstract

A data reduction scheme for multiple-wavelength, line-of-sight, optical pyrometry applied to pulverized-coal flames that accounts for the presence o f soot and its elfect on computed temperatures is presented. Results o f the application o f the technique to laboratory scale flames are reported. Soot temperatures are calculated to be between gas and particle emperatures, with the gas temperature exceeding the particle temperature. From about 1 to about 10 percent of the original coal by mass is computed to be present as soot in the flames with soot concentration increasing with increasing coal concentration.