Discussion on influencing factors of the pulse-jet performance of fabric filter

摘要

In this study, we establish a numerical model and use computational fluid dynamics (CFD) analysis to measure peak pressure on the surface of filter bag. The numerical results are in good agreement with the experimental data during the pulse cleaning process. Peak pressure on the surface of filter bag, pressure rise rate and maximum reverse acceleration are used as evaluation indicators of bag-cleaning intensity. The filter bag peak pressure, pressure rise rate and maximum reverse acceleration along the length direction of filter bag during the pulse cleaning process are analyzed under different pulse-jet pressure, different pulse-jet distance, different length of filter bag, different pulse-jet time and for different diameter of nozzle. The results show that three evaluation indicators are consistent along with the change tendency of various factors. The evaluation indicators all have remarkable drop along with the filter bag length increasing, and increase as the nozzle diameter and the injection pressure increase. It provides optimal ranges of pulse-jet distance and pulse-jet time, such as pulse-jet distance is at 250 mm, and pulse-jet time is in 70∼100 ms. The design length of filter bag unfavorably exceeds 8000 mm. The simulation method can direct-viewing describe pulse-jet flow, and reflect accurately the characteristics of cleaning, thus enhance design reliability.