袋式除尘器清灰后除尘空间浓度场分析

通过动量守恒方程建立袋式除尘器滤袋清灰后滤袋周围浓度场的数学模型,并应用该模型分别对粗细粉尘,通过改变气流上升速度、袋间距,来计算除尘空间浓度场随时间的变化。结果表明:较细的颗粒物基本悬浮在袋口下0.5～2.5 m(滤袋长度8.3%～41.7%)的除尘空间中,而较粗的颗粒物沉积到滤袋的中下部被过滤;袋间距越小,其过滤浓度越大,相应的过滤速度也比较大;随着上升速度的增大,粒子悬浮的空间离袋口越近,其平均浓度也相应的越低(重新被过滤的颗粒物也越多)。

THE ANALYSIS OF PARTICLE DISPERSION IN DUST REMOVAL SPACING AFTER BAG FILTER'S ASH CLEANING

the mathematical model of particle concentration distribution around the filterbag was established through momentum conservation equation after the bag filter's ash cleaning.this model was applied to calculate the particle dispersion by changing the size of particle、updraft speed and bag spacing with time varying.The calculation results show that the fine particles are floating under the pocket about 0.5 m to 2.5m(8.3%～41.7%of bag length),on the other hand the coarse particles are suspended in the lower part of filterbag spacing;the smaller the bag spacing,the higher the filtration concentration as well as the filtration speed;the higher updraft speed,the closer to the top of filterbag with particle suspended in filtration spacing,and the lower average concentrations.