Numerical Simulation Study of a Novel Pulse-Jet Cleaning Blowpipe for Cartridge Filters
A novel pulse-jet cleaning blowpipe was designed and numerically investigated to enhance the cleaning performance of cartridge filters. The blowpipe has an inner diameter of 40 mm and a total length of 660 mm, with 6 mm diameter orifices spaced at 110 mm intervals along its circumference. These orifices direct high-pressure gas jets directly onto the inner wall of the filter cartridge, achieving cleaning through combined impact force and static pressure. Computational fluid dynamics (CFD) simulations were performed under a pulse pressure of 0.3 MPa. Pressure contour maps of longitudinal and cross-sections were analyzed at various time points and blowing distances. Total pressure, dynamic pressure, and static pressure peaks were monitored at four key locations: directly in front of orifices, between front orifices, at side orifices, and between side orifices. Results indicate that the system reaches a stable state at 60 ms, significantly shortening the cleaning cycle. The highest total pressure peak (3939.22 Pa) occurs directly in front of the orifices, while the lowest static pressure peak (-134.23 Pa) is observed at side orifices, where dynamic pressure reaches a maximum, contributing to cleaning effectiveness. The cleaning intensity is superior in the upper part of the filter cartridge compared to the lower part, and side orifices exhibit better uniformity than front orifices. Compared to conventional nozzles and built-in rotators, the novel blowpipe demonstrates improved cleaning performance and uniformity, though challenges remain for complete upper-section cleaning.