ИЗУЧЕНИЕ ВЛИЯНИЯ СКОРОСТИ ВХОДЯЩЕГО ПОТОКА НА ЭФФЕКТИВНОСТЬ ЦИКЛОНОВ

Abstract

A study into the influence of the speed of the incoming dust flow and a size of the inlet of a cyclone on its performance. The structure of the flow field has been investigated by calculations made using the Reynolds Stress Turbulence Model (MTNR) for a cyclone separator. The findings show that the maximum tangential velocity in the cyclone decreases when the entry size to the cyclone increases. No acceleration occurs within the cyclone body (maximum tangential velocity is almost constant throughout the cyclone). Increased size of the cyclone inlet reduces the drop of pressure. The cyclone's cutoff diameter increases with the cyclone's inlet size (therefore, the overall efficiency of the cyclone decreases due to a low vortex strength). The effect of altering the entry’s width is more significant than its height, especially for the cut-off diameter. The influence of simulations of velocity fluctuation on prediction of collection efficiency of cyclone separators has been numerically investigated using MTNR and large eddy simulation (MBV). The Euler-Lagrange modeling approach was used by Solidworks Flow Simulation to simulate 3D non-stationary turbulent gas and solid flows in the high-efficiency Starmand cyclone. The simulation results have been compared with available reference data. An analysis of the findings shows that the MTNR and MBV could adequately predict the mean flow field. The study shows that the (MBV) performs well in predicting fluctuating flow field and capture efficiency for each particle size. The results show that prediction of collection efficiency, especially for fine particles, is greatly influenced by simulation of velocity fluctuations in cyclones.