INFLUENCE OF THE GAS TEMPERATURE ON THE SEPARATION EFFICIENCY OF AEROCYCLONES

The design of aerocyclones operating at high temperatures is still a d ifficult problem since practical experience shows that the separation efficiency really obtained is mostly smaller than that calculated. For this reason, the pressure drop and the grade efficiency has been meas ured over the temperature range 293-1123 K. Both quantities show a rem arkable influence on the gas temperature. A new model into which a wal l friction coefficient depending on the temperature is introduced and consideration taken of the re-entrainment of already separated particl es together with the boundary layer flow at the cyclone cover plate, t he cyclone wall and along the outside of the vortex finder leads to me asured pressure drops and grade efficiency curves for high temperature s of a high accuracy.