Orthogonal vortices characteristic, performance evaluation and classification mechanism of a horizontal classifier with three rotor cages

Horizontal classifiers with multiple rotor cages have competitive advantages of larger process capacity and smaller cut size. This study represents the gas-solid simulation, performance evaluation and classification mechanism of a horizontal classifier with three rotor cages. The gas turbulence was modeled using the Reynolds stress model (RSM), and the particle flow was predicted by the dispersed phase model (DPM). More than fifty operating conditions were analyzed for the performance evaluation. A schematic map showing the gas-solid flow dynamics was constructed. It was found that three rotating gas screen are independently induced and evenly distributed around the rotor cages. The M-shaped axial and tangential velocities have strong shear and washing effect on the near-wall particle. The maximum particle residence time of the cut size can be hundreds of seconds. The experimental cut sizes range from 7.2 pm to 25.7 pm with high classifying sharpness index (>55%) and superfine particle yield (>71%).(c) 2022 Elsevier B.V. All rights reserved.

Automated summary

This study investigates the gas-solid simulation, performance evaluation, and classification mechanism of a horizontal classifier with three rotor cages. The study finds that this classifier has competitive advantages of larger process capacity and smaller cut size, and can achieve high-quality classification.