Abstract
A shear-impact-type atomized dust controller was designed by combining the rotary spray blades and axial flow fan, and the droplet atomizing process included two steps: shear-atomizing and impact-atomizing. The comprehensive operating parameters of this dust controller were studied by measuring different droplet size, airflow velocity, water consumption, nebulization efficiency, and collecting efficiency under different rotating speed, diversion hole-exit diameter, and colliding tooth angle. The relationships among them have been particularly analyzed. Results indicated that the droplet size is greatly influenced by rotating speed; the airflow velocity enhances monotonously with the increase in rotating speed. Excessive rotating speed and diversion hole-exit diameter can cause water waste, and suitable colliding tooth angle θ can improve nebulization efficiency. The optimal operating conditions were obtained with rotating speed 1500–2100r/min, diversion hole-exit diameter 2–2.5mm and colliding tooth angle 35–40° by fully considering security, water consumption, nebulization and collecting efficiencies. In this case, the nebulization efficiency exceeds 96.3% and the collecting efficiency tops 98.6%.
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