Abstract
After introducing coal slurry fuels, results obtained from sedimentation tests conducted with coal—coal liquid mixtures have been presented to suggest that coal liquids may be used to formulate stable coal slurry fuels. The enhanced aggregative stability of these slurries has been attributed to the compatibility of coal liquid with the coal particle surface at a molecular level Rheological properties of the coal—coal liquid slurry fuel were studied using a Brookfield viscometer in association with an isothermal chamber. At a coal loading of 10 wt.%, the coal slurry was Newtonian in character. At higher coal loadings, the slurries were non-Newtonian and exhibited yield stress. The slurries also showed time-dependent behavior. Relative slurry viscosity and yield stress were strong functions of coal loading. Experimental data showing the dependence of relative slurry viscosity on coal loading have been compared with promising theoretical models. Slurry viscosity plotted as a function of temperature on an ASTM D-341 chart showed linear behavior.
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