The Inner Flow Pattern of a Rotary Dust Collector Respecting its Capacity

Abstract

The rotary dust collector used for this experiment is of a mechanical centrifugal type combined with a tangential entrance and an internal rotor so designed altogether as to arouse a vortex of air.
Both the rotors of the radial-flow type and of the axial-flow type were compared with the cyclone of the conventional type with respect to their collection efficiency. The results of experimental study of their capacity for winnowing fly ash show that the axial-flow type rotor yields higher collection efficiency at lower inlet velocities than the conventional type cyclone, and that it has at higher inlet velocities much less detrimental effect than the radial-flow type rotor on its collection efficiency.
Moreover in case the axial-flow type rotor with blades on the periphery is used, it is possible to formulate critical particulate diameter to sift the particles, though with simple assumptions, and that, if the overall collection efficiency is taken as equal to the cumulative-weight distribution of particles larger than the critical diameter among the dust collected in the collector, the predicted value of the collection capacity is found to be in good agreement with the experimental value.
The relation of the results of the measurement of efficiency to the measured data concerning velocity distribution have also been briefly discussed.