Abstract
Characteristics times were estimated for the heating, vaporization, ignition, and combustion of 10 to 100 μm coal-water slurry droplets under conditions measured in 1 MW turbulent diffusion flames with high swirl. Agglomeration of the coal particles in a droplet was assumed to result in a coal particle size identical to the atomized droplet size. The locations of the ignition and combustion processes along the flame axis were determined from droplet trajectories based on estimates of the initial droplet velocity and measured gas velocities. Gas temperature and oxygen profiles recalculated using the predicted spatial distribution of the combustion processes, an estimate of the droplet size distribution, and the properties of the externally recirculated combustion products, were consistent with the measurements. The droplet velocity leaving the atomizer, and the gas velocity in the region of the fuel spray have important effects on the spatial distribution of ignition and combustion through their determination of the droplet trajectories. The presence of 32 to 36 wt% water in a slurry droplet results in an increase of about 50% over the distance required for ignition of an equivalent coal particle under the conditions which existed in the flames.
Published Version
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