喷吹管对滤袋清灰性能的影响

为了探究喷吹管开孔个数和开孔位置对长滤袋（φ160 mm×6 000 mm）清灰效果的差异，在自建脉冲喷吹实验台上，利用QSY8135压电式压力传感器，测试喷吹压力0.1~0.4 MPa，喷吹孔数4~8个时，不同开孔位置沿滤袋方向的侧壁压力。结果显示：脉冲喷吹压力0.2 MPa下的电磁阀一次喷吹实际耗气量是脉冲喷吹压力0.1 MPa的1.23倍，沿滤袋方向的平均侧壁压力是1.68倍，0.2 MPa的标准差为0.418 3，脉冲喷吹压力0.3 MPa下的电磁阀一次喷吹实际耗气量是喷吹压力0.1 MPa的1.48倍，沿滤袋方向的平均侧壁压力是2.34倍，0.3 MPa的标准差为2.430 4，得到本实验条件最佳喷吹压力0.2 MPa；喷吹压力0.2 MPa，当开孔个数不同时，沿喷吹管方向靠近电磁阀的第二个喷吹孔沿滤袋方向平均侧壁压力最小，开孔位置中最远离脉冲阀的孔沿滤袋方向平均侧壁压力最大，最小的侧壁压力是最大侧壁压力的0.539倍，当开孔数为8个，标准差0.170 5，值最小，清灰均匀性最好。对长滤袋喷吹管上开孔个数和喷吹位置的研究为袋式除尘器喷吹系统的改进和设计提供理论依据。

Influence of injection pipe on dust-cleaning performance of bag filter

The difference between the number and opening positions of blowing tubes on cleaning performance for long filter bags (φ160 mm×6 000 mm) was investigated. Piezoelectric pressure transducers (model QSY8135) were used to test the peak pressure along the length of the filter bag for different opening positions of blowing tubes when the pulse pressure was in the range from 0.1 to 0.4 MPa and the number of blowing tubes was 4 to 8. The experimental results show that the actual compressed-air consumption of electromagnetic valves and the average wall pressure under a pulse pressure of 0.2 MPa were 1.23 and 1.68 times those at 0.1 MPa,respectively,with a standard deviation of 0.418 3. The actual compressed air consumption of electromagnetic valves and average wall pressure under a pulse pressure of 0.3 MPa were 1.48 and 2.34 times those at 0.1 MPa with a standard deviation for 0.2 MPa of 2.430 4. It was concluded that the optimum pulse pressure was 0.2 MPa for different numbers of blowing tubes,whereas the average wall pressure of the second blowing hole (near the magnetic valve)is the lowest and the average wall pressure of the blowing hole farthest from the pulse valve is the highest. The minimum wall pressure was 0.539 times the maximum wall pressure. When the number of blowing holes was eight,the standard deviation was smallest (0.170 5),and uniformity was the best configuration. The study of the number and opening positions of blowing tubes provides a theoretical basis for improvement and design of bag filter injection systems.