Abstract
The coal-water slurry (CWS) is a potential new form of fuel for application in power boilers and industrial furnaces. The single suspended coal-water slurry droplets have been burned in hot gas streams to reveal their basic nature of evaporation and heating processes. Temperature measurement and microscopic observation are performed. The effect of the coal type and the droplet size on the slurry combustion are studied systematically. Increasing the coal fraction in the slurry or decreasing the droplet size at the atomizer may enhance the combustion stability by reducing the effect of water evaporation. The physical mechanisms of the evaporation and heating processes of caking and non-caking slurries are proposed. Since the non-caking coal particles will not agglomerate during the heating, the complete combustion of the low rank lignite slurry could be easier to achieve.
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