Abstract
Coal-water slurry (CWS) is a potential new form of fuel for application in power boilers and industrial furnaces. Single suspended coal-water slurry droplets have been burned in hot gas streams to reveal the basic nature of their evaporation and heating processes. Temperature measurement and microscopic observation were performed. The effect of coal type, droplet size, coal fraction in the slurry, and gas temperature and velocity on slurry combustion were studied system-atically. Increasing the coal fraction in the slurry or decreasing the droplet size may reduce the time of water evaporation. Physical mechanisms of the evaporation and heating processes of caking and noncaking slurries are proposed. Since the noncaking coal particles will not agglomerate during heating, the complete combustion of low-rank lignite slurry could be easier to achieve.
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