The Numerical Simulation Of Gas-Solid Two-Phases Movements In Cyclone Separator

Two-phases flow in cyclone separator was simulated by numerical method in this paper. The gas flow in a cyclone is a three-dimension strongly swirling flow, so Reynolds Stress Transport Model was used to simulate turbulence. Meanwhile, Stochastic Trajectory Model was adopted to track the trajectory of particles. The velocity field, pressure field and the trajectory of particles in the Lapple cyclone were simulated. It is found that the simulation results are in agreement with the experiment results preferably.By analyzing the results of simulation and experiment, a series of new phenomena were found. There is an inner boundary within the rotational flow field of cyclone. The velocity head is zero on the inner boundary. As gas flows collide with each other around the gas inlet, a chaos flow is formed along the gas exhaust duct wall. This chaos flow is also called as short-out flow. One of effective measures to weaken short-out flow is to set up an eccentric gas exhaust duct. Along the geometry axe of cyclone, source and converge alternately form in couples as a result of squeezing between gas flows. For the particles c ollected from t he c yclone, p articles o f d Afferent d iameter w ill h ave d ifferent residence time in cyclone. If particle diameter is more than a critical value, the particle will keep circular motion in the cone of cyclone, so the residence time of the particle is longer. In contrast, if particle diameter is less than this critical value, the particles will have shorter residence time. Therefore, these results will provide great help to develop new type cyclone.