旋风-滤板一体式除尘器性能优化数值研究

Numerical study on performance optimization of cyclone-filter plate combined dust collector

为弥补旋风除尘器尤其是大筒径旋风除尘器对微细颗粒除尘效率低的不足,通过在旋风除尘器环形空间内安装金属纤维滤板构造出旋风-滤板一体式除尘器,将离心与过滤两种除尘机理联合以提高微细颗粒的除尘效率。数值模拟研究了旋风-滤板一体式除尘器的滤板宽度W、高度h与个数N等因素对其分离性能的影响,在此基础上采用正交试验对金属纤维滤板的几何结构进行参数优化设计。结果表明:滤板参数对除尘效率显著性排序为N>h>W,滤板参数推荐取值为W=0.05Dc、h=1.5L、N=4,此时一体式除尘器对于2.5μm颗粒的分离效率为80.8%,与旋风除尘器相比分离效率提高22.9%,并使压降降低28.8%。

To compensate for the low efficiency of cyclone dust collector,especially the large diameter cyclone dust collector,a cyclone-filter plate combined dust collector was made by installing metal fiber filter plate in the annular space of cyclone dust collector.Then the dust removal efficiency for fine particles of which could be effectively improved by combining the centrifugal and filtration mechanisms.The influence of the width,height and number of metal fiber filter plate on the Separation performance of combined dust collector were investigated through numerical simulation.Based on the above influence law,the parameters of geometric structure of metal fiber filter plate were optimized by orthogonal experiment.The results indicate that the significance order of the influence of these parameters on the efficiency of combined dust collector is N>h>W.The optimum values of filter plate parameters are W=0.05Dc,h=1.5L,N=4.Under this condition,the separation efficiency for 2.5μm particles of combined dust collector is 80.8%,which is 22.9% higher than that of the cyclone separator,and the pressure drop is 28.8%lower.