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选取SLK选粉机分级室腔体作为计算域物理模型,采用标准K-ε湍流模型和随机颗粒轨道模型及其两相耦合求解对腔体内的气-固两相流进行数值模拟,在一定的边界条件下,研究了分级室壳体不同倾角以及含料气体从下锥体进入分级室的速度变化对分级室内气固分布的影响。结果表明,减小分级室壳体倾角有利于分级室内的气流上下分布均匀,含料气体从下锥体进入分级室的速度过大或过小都会引起分级室内颗粒浓度上下差异较大。进一步模拟比较得出:当分级室壳体倾角约为75°～80°,气流进入分级室的速度约为8～10m/s时,分级室内上下气固浓度和速度分布最均匀,有利于分级。此结果已通过实验验证并已在生产应用上取得良好效果。
Select SLK classifier chamber as a computational domain physical model, the use of standard K-ε turbulence model and random particle orbit model and its two-phase coupled solution to the cavity of the gas-solid two-phase flow numerical simulation, in a certain Under the boundary conditions, the effects of different inclination of the shell in the classification chamber and the velocity variation of the material gas entering the classification chamber from the lower cone on the gas-solid distribution in the classification chamber were studied. The results show that reducing the inclination of the housing of the grading chamber is conducive to the uniform distribution of gas flow in the grading chamber. The velocity of the gas containing material entering the grading chamber from the lower cone is too large or too small, which will lead to large differences in particle concentration in the grading chamber. Further simulations and comparisons show that when the inclination of the shell of the grading chamber is about 75 ° -80 ° and the velocity of the airflow entering the grading chamber is about 8-10 m / s, the gas-solid concentration and velocity distribution within the grading chamber is the most uniform and is conducive to grading . This result has been verified experimentally and has achieved good results in production applications.