Applying laser-induced incandescence (LII) technique to soot volume fraction measurements for pyrolyzing pulverized coal

Staged combustion and gasification of coal are conducive to soot formation. Presence of soot in combustion systems can affect heat transfer, pollutant formation, and unburned carbon levels.Development of an accurate soot production model requires high-quality experimental data. For this purpose, the laser-induced incandescence (LII) technique was applied for in-situ measurements of soot volume fraction in the vicinity of pyrolyzing pulverized Pittsburgh #8 coal particles passing through the center of a fuel-rich flat flame burner. A pulsed ND:YAG laser was used as the light source, while an intensified CCD camera captured the spatially-resolved two-dimensional distributions of soot volume fraction. Spatially-resolved measurements with good signal-to-noise ratios were made downstream of the gaseous flame sheet.