脉冲喷吹长滤袋清灰性能实验研究

Experimental study of dust-cleaning performance of pulse injection on long filter bag

为探究脉冲长滤袋除尘器清灰影响因素,搭建脉冲清灰实验平台,在实际使用工况下,得到不同清灰参数下滤袋侧壁压力峰值、压力上升速率曲线及清灰效率。从清灰强度的角度出发,分析喷吹压力、喷吹高度及脉冲宽度对清灰效率的影响。实验结果表明:喷吹压力的增大可提高清灰强度,改善清灰效果,但喷吹压力增大至0.35MPa后,清灰效率趋于饱和;喷吹高度存在最优值200 mm,使得滤袋清灰效果最佳;脉冲宽度对清灰强度几乎无影响,但脉冲宽度对粉尘的沉降过程有重要的影响,脉冲宽度的增大降低了剥离粉尘二次附着概率,有助于改善滤袋的清灰效果;平均侧壁压力峰值、平均压力上升速率在360 Pa、22.5 Pa·ms^(-1)后,滤袋的清灰效率趋于饱和。

To investigate the influencing factors of cleaning efficiency of 10 m-long filter bag,experiments on pulsed on-line cleaning was carried out under different conditions. The peak pulse overpressure,pressure rise velocity,and the cleaning efficiency of bag filter were recorded. The influence of different pulse-jet pressures,pulse durations,and pulse-jet distances and the cleaning efficiency were analyzed from the angle of the cleaning intensity. The results indicated that increasing of pulse-jet pressure helps to improve the cleaning intensity and the efficiency,a critical pulse-jet pressure of 0. 35 MPa existed for an effective bag cleaning; There was an optimum value of pulse distance for the best cleaning efficiency; Pulse duration merely reflect the cleaning intensity,however the pulse duration have a positive impact on the sedimentation process of the dust,the increasing of the pulse duration reduced the secondary adhesion probability of the stripping dust,which improved the cleaning efficiency; critical average peak pulse overpressure and average pressure rise velocity of 360 Pa and 22. 5 Pa · ms-1 exist for the best effective cleaning efficiency.