Improved Pulsed-Jet Performance by Array Nozzles for Annular Filter Cartridges

With inner and outer filter parts having the advantage of a more compact structure and a larger area of a single filter cartridge, a three-dimensional numerical simulation model of annular filter cartridge was constructed, and the pulsed-jet performance of annular filter cartridge with array nozzle was investigated. The spatial and temporal distribution of injection pressure in filter core was analyzed; the injection flow field, the induced ratio, and the eddy current under different number (N) of nozzles were compared. The effects of jet angle (α) and jet distance (H) on the pulsed-jet intensity and pulsed-jet uniformity were examined. The results showed that the appropriate number of outlet openings for array nozzles is 4, which corresponds to the induced ratio of 310.4%. With the increase in jet angle, the pulsed-jet intensity first increases and then decreases (the optimal jet angle is α=0°), and the pulsed-jet uniformity first decreases and then increases. With the increase of the jet distance, the pulsed-jet intensity increases first and then decreases (the optimal jet distance is H=250 mm); and the pulsed-jet uniformity was improved. Compared with N=2, the array nozzle can improve the pulsed-jet intensity by 15.5% and the pulsed-jet uniformity by 4.8 times (reducing the coefficient of variation from 0.52 to 0.09) under the optimal parameters (N=4, α=0°, H=250 mm). The research provides a reference for optimizing the performance of the dust collector with annular filter cartridges in space-constrained working environments.