摘要：通过构建不同分级环间距的选粉机模型, 利用计算流体动力学理论对SLK5500型选粉机不同分级环间距时的流场特性进行研究, 得出最优的分级环间距, 并对整机进行实验验证。结果表明, 分级环间距过小, 分级区内颗粒浓度较大, 颗粒分散均匀性差, 造成成品颗粒跑粗;分级环间距过大, 分级区颗粒浓度较小, 颗粒分散均匀性好, 但进出口压差较大, 能耗升高, 且成品颗粒产率较低;当分级环间距为250 mm左右时, SLK5500型选粉机的分级性能最优。

关键词：选粉机；分级环间距；颗粒浓度；两相流

Abstract：By building the classifier model with different grading ring spacing sizes, the flow field characters of different grading ring spacing sizes in SLK5500 type classifier were studied according to the computational fluid dynamics (CFD) theory. The best grading ring spacing size was obtained and a test on the classifier was made. The results show that if grading ring spacing size is too small, the particle concentration of classification area is comparatively higher, which results in much coarser size particle of the products. If grading ring spacing size is too large, the particle concentration of classification area is comparatively lower, and the differential pressure between inlet and outlet is larger, which results in more energy consumption and less finished particle productivity. The SLK5500 type classifier shows the optimum classification performance if the grading ring spacing size is about 250 mm.

Keywords：classifier; grading ring spacing; particle concentration; two phase flow