THE EFFECT OF THE DUST COLLECTION SYSTEM ON THE FLOWPATTERN AND SEPARATION EFFICIENCY OF A GAS CYCLONE

The influence of the presence of a hopper section, consisting of a dus t hopper and swirl attenuator, under gas-solid cyclones has been inves tigated by numerical simulation. Inclusion of this configuration in th e simulations was found to have a significant influence on both flowpa ttern and separation efficiency. Moreover, predicted axial gas velocit y profiles agreed better with independent experimental measurements. T he cyclone separation was predicted to be better with the hopper secti on included than without, a physical reason is proposed. Comparison of simulated grade-efficiency curves with experimental data indicates im proved agreement, in some cases substantially so.