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 impingingstream (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, α, of the IS was 40-60°. The water spray increased the collection efficiency by 5-20% in comparison to dry collection. In the coaxial configuration, α = 0°, 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 α = 40°. A simple model for collection of the particles has been established, showing a satisfactory agreement with experimental results.