涡流空气分级机环形区流场的实验研究

为优化涡流空气分级机内的流场,提高分级机性能,研究了涡流空气分级机蜗壳内加水平隔板和不加水平隔板2种结构对分级精度的影响。2种结构分级机环形区流场的激光多普勒测速计测量结果表明:在涡流空气分级机蜗壳内加隔板后,减小了环形区气流的轴向速度,沿转笼轴线方向,切向速度分布趋于均匀一致,流场稳定。重质CaCO3物料实验表明:在所试验的风速和转速范围内,采用较高转速分级,加隔板分级精度降低。环形区内适当的湍流能够提高物料的分散性,对提高分级精度有利。

Experimental study on flow fields in a turbo air classifier annular regions

In order to optimize the flow field in a turbo air classifier and to improve the function of classifier,the effect of the structures of volute with and without horizontal plate on the classification precision was investigated in a turbo air classifier.The flow field of two structural annular regions was measured by Laser Doppler Velocimeter(LDV).The results demonstrate that the axial velocity of the former is less than that of the latter and the velocity distribution of the stream is even along the height direction of the rotor cage.The classification tests of ground calcium carbonate were carried out.Under the experiment condition,the classification sharpness decreases when the volute is divided by the horizontal plate and rotor cage rotates at the high speed.The proper turbulence in the annular region is favorable to improve the dispersion of the material so that the classification sharpness increases.