Abstract
Characteristics of Coal Water Slurry (CWS) sprays generated by an effervescent atomizer are measured using a PDPA system. Coal particles of sizes 75 & 250 µm are considered. Measurements of both CWS and water only along axial and radial coordinates are carried out over the range of air to liquid ratio (ALR) of 0.02 – 0.1 and atomizing air pressure of 2 – 4 bar. The results show the increase of Sauter Mean Diameter (SMD) and the decrease in droplet velocity with the increase of the radial distance away from the centerline. A decrease in SMD with the increase of ALR is observed up to a value of 0.4. Above this value, the ALR has a little effect. The results also show that the SMD of CWS having smaller coal particles is larger than SMD of CWS having larger coal particles. The results of CWS having larger coal particles are closer to the results of water only than CWS having smaller coal particles.
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