电除尘器结构对除尘效率影响的数值分析

Numerical Analysis of the Effects of Electrostatic Precipitator Structure on Dust Removal Efficiency

为了得到电除尘器结构对除尘效率的影响,基于Fluent进行数值计算,分析了除尘效率随不同电极线数、不同极板间距、不同极线间距和不同极线偏离距离的变化情况,得到,电极线越多,除尘效率越高,电压越高,电极线对效率的影响越明显;电极线间距存在一个最佳值,使得除尘效率最高;极板间距增大,使得颗粒沉降需要更长时间,不利于除尘;低速时(0.3 m/s),离子风有利于颗粒沉降,电极线的偏置使离子风的双螺旋变成单螺旋结构,更多的颗粒从线板距大的一侧流过,当电极线下移7.5 mm时,平均场强最大,除尘效率最高。

In this study,with the aim at obtaining the effects of electrostatic precipitator structure on the efficiency of dust removal,on the basis of the numerical calculation of Fluent,variation of the efficiency of dust removal with different electrode lines,different plate spacing,different electrode spacing and different electrode line bias was analyzed. The results showed that the more the electrode lines were,the higher the dust removal efficiency was. The higher the voltage was,the more obvious the effect of the electrode line on the efficiency was. There was an optimal value in the electrode line spacing at which the dust removal efficiency was the highest. When the distance between the plates increased,particle sedimentation took a longer time and consequently was not conducive to dust removal. At the low speed（ 0. 3 m/s）,ion wind favored particle sedimentation. Bias of the electrode lines made the double helix of the ion wind changed into a single helix structure. Then,more particles flowed from the wider side of the electrode line to the plate. When the electrode line was moved down about 7. 5 mm,the average field strength was the largest and the dust efficiency was the highest.