Abstract
Abstract The effect of coal particle size on coal-water slurry (CWS) atomization is examined by comparing classified CWS sprays containing coal particles in different size ranges. The sprays are generated by injecting a CWS mixture into a sonic air jet and the Malvern sizing system nonintrusively measures spray Sauter mean diameters (SMD). The results consistently show that the spray SMDs of the CWS containing smaller coal particles are larger than the spray SMDs of the CWS containing larger coal particles. The internal capillary holding force between the particles and water increases with decreasing particle sizes because of their smaller radii of curvature. This increased holding force strongly resists against the external airblast and makes the atomization difficult. On the other hand, the relatively small capillary holding force of the CWS containing larger coal particles carries weaker resistance to the external airblast, and smaller spray SMDs result.
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