Numerical simulation of the influence on uniformity index of pulverized coal exerted by the rotor-stator combination of the ZGM16 modular-type classifier

In order to explore the effect on uniformity index of pulverized coal produced by the rotor and stator blades of the modular dynamic classifier, an overall analog modeling is made of the ZGM16 pilot-scale mill, and the evaluation of mesh independence is made using Richardson extrapolation method. The behavior of motion of particles in the mill is simulated using the RNG k-ε and DPM models in Fluent software and through uniform test. Finally, the 3D response surfaces between uniformity index and deflector baffle and rotor are plotted. As indicated by result of simulation, at a mesh density of 16 million, a relatively more accurate simulation result can be expected; the influence of rotor speed and baffle angle on uniformity index of pulverized coal can be fitted using binary quadratic linear model with a far higher fitting accuracy and significantly improved dependency; and the interaction between rotor and stator blades can exert a significant impact on uniformity index.