Experimental investigation of phosphate dust collection in impinging streams (IS)

An experimental study on collection of dry phosphate dust and coalescence of moistened phosphate dust in an impinging-stream (IS) collector has been conducted in the presence and in the absence of a water spray. The total collection efficiency with a water spray of specific consumption of 0.3 kg water/kg dust was 95-97%. Air velocity at the inlet pipes varied between 10-30 m/s and the inclination angle with respect to the horizontal, alpha, of the IS was 40-60 degrees. The water spray increased the collection efficiency by 5-20% in comparison to dry collection. In the coaxial configuration, alpha=0 degrees, it has been obtained that in the presence of a water spray, up to 55-85% of the dust accumulated on the walls of the collector, which was undesirable. Applying the inclined IS decreased the above quantities up to 5-15% with an optimal inclination angle of alpha=40 degrees. A simple model for collection of the particles has been established, showing a satisfactory agreement with experimental results.