采用计算流体动力学软件Fluent对袋式除尘器内部流场进行三维数值模拟，提出3种优化灰斗结构模型，得到除尘器灰斗内部的气流流场分布特征，将其与原灰斗结构的气流分配效果对比. 结果表明，原灰斗结构气流进入灰斗后形成一股冲击射流，在选取的监测面上速度最大为8.3 m/s，最小仅为0.5 m/s，速度分布均方根值高达0.99，速度在监测面上分布极不均匀；3种优化结构中袋室内气流均匀性均比原灰斗结构显著改善，在灰斗内添加导流装置可提高气流分配的均匀性；3种优化结构中，添加竖直导流板的灰斗结构对改善气流分配均匀性最明显，比原灰斗结构流动均匀性提高了41.41%，而考虑射流偏转添加倾斜导流板或翼板的优化结构与竖直导流板相比流动均匀性无显著变化，灰斗内部射流偏转对流场分布的影响可忽略.

The computational fluid dynamic simulation of the airflow inside a bag filter was carried out, three optimized structures of the hopper were proposed to improve the original hopper structure. The flow characteristics of the airflow inside the bag filter were obtained. The effect of airflow distribution of three optimized structures were compared with original structure. The results showed that the airflow in the hopper of the original structure formed an impinging jet. The maximum velocity was 8.3 m/s, and the minimum velocity was only 0.5 m/s, the relative root mean square velocity of the monitoring surface was 0.99. The velocity distribution on the corresponding monitoring surface was extremely uneven along the mainstream direction. The airflow uniformity inside the bag filter was improved in all three optimized structures, thus it was possible to improve the airflow uniform distribution by adding baffles. Considering the airflow uniform distribution inside the bag filter, adding vertical baffles was optimal, which can be improved by 41.41%. However the uniformity of the optimized structures with the third tilted baffle or the straight plate with a wing were not significantly improved compared to the addition of vertical baffles. Therefore when the hopper structure is optimized, the influence of the deflection of impinging jet on the airflow distribution inside the hopper can be neglected.