Particle classification of fly ash using a modified louver-type separator and reduction of unburned carbon amount

Abstract

Experimental and theoretical studies have been conducted on the classification of fly ash particles using a bench-scale louver separator. A new type of louver blade based on Joukowski's theory demonstrated classification performance superior to that of the plane-type blade. Classification performance changed with the angle of louver blades, the optimum blade angle being 50° for the Joukowski type and 70° for the plane type. The finite element method was used to solve the Navier-Stokes equations. Calculated partial separation efficiency agreed with the experimental results. The unburned carbon amount on the classified fine particle decreased about 20 to 30 wt%.