ON THE SEPARATION CHARACTERISTICS AND THE FLOW PATTERNS IN THE RETURNED FLOW TYPE OF THE NORMAL AND ECCENTRIC CYCLONE DUST COLLECTORS

Abstract

On the returned flow type of the normal cyclone which has one tangential inlet pipe, the vortex core is deviated from the center line and vibrates violently. Then in order to compare the collection characteristics of the ultra-fine solid particles (fly-ash) and the flow patterns of the tangential and axial velocities, the eccentric cyclone in which the exit pipe deviates merely δ = 10 mm from the center line of cyclone and the normal cyclone were made by the acrylic resin. From the experimental results of the both types of the cyclones, the pressure drop of the normal cyclone was larger than the eccentric cyclone, the collection efficiency of the normal cyclone was promoted in comparison with the eccentric cyclone, the maximum tangential velocity of the normal cyclone was faster than the eccentric cyclone, therefore the centrifugal effect of the normal cyclone was larger than that of the eccentric cyclone and also from the results of the axial velocity distributions in the eccentric cyclone the existenses of the double and triple large circulations which hindered the separation characteristics of the fine solid particles were suggested.