Abstract
The overall objective of this project is to perform experiments to understand the effect of coal beneficiation processes and high shear rheological properties on the atomization of coal-water slurries (CWS). In the atomization studies, the mean drop size of the CWS sprays will be determined at various air-to CWS. A correlation between the high shear rheological properties, particle size distributions and the atomization will be made in order to determine the influence of these parameters on the atomization of CWS. During the past quarter, the experimental data obtained from the previous quarter on pressure dependent atomization of coal-water slurries and simulated fluids glycerol-water and glycerol-xanthum gum, were analyzed. The spray data for the glycerol-water and glycerol-xantham gum solution are as shown in Figures 3 and 4. The plots indicate that the Sauter mean diameter (SMD) increase with decrease in Air/Fuel (AFR). Comparison of Figures 3 and 4 indicate that the addition of the xantham gum to the glycerol solution increases the SMD values especially in the low AFR regime. Figure 5 compares SMD data as a function of AFR for the CWS samples under study. The data indicate that the beneficiated CWS samples atomized well, and that the SMD values obtained at all AFR were smaller than the run-off mine CWS sample.
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