Optimization of pulse-jet cleaning performance and influencing factor analysis for filter cartridges with a Venturi diversion tube

The filter cartridge is a filter unit made by repeatedly folding the filter material into folds. Compared with traditional round bags and folded filter bags with the same size， it offers a larger filtration area while occupying less space， and has the advantages such as simple maintenance and management， low resistance， and high efficiency， etc. These features make it widely applied in the dust-containing gas filtration system where air serves as the medium. In the purification of dust-containing gas discharged from industrial kilns， most dust collectors are used in high-temperature environments， and the filter cartridge is susceptible to the influence of the depth and spacing of the fold， resulting in problems such as compaction， bagging， and dust accumulation. These problems reduce the effective filteration area of the filter cartridges， and increase the operating resistance of the system. In addition， they accelerate wear and corrosion of the filter material caused by dust， ultimately shortening the service life of the filter cartridge.The standard lengths of conventional filter cartridges typically encompass 660 mm and 1000 mm. While elongating the length of the filter cartridge enhances the filtration area and subsequently diminishes the filtration wind velocity， it might also compromise the compressed air volume or pressure， thereby impeding the sprayed airflow's capacity to penetrate the cartridge's depths for effective dust removal. To address these concerns， the present study focused on a 3 m filter cartridge， constructing a three-dimensional model of the same and employing numerical simulation analysis techniques to meticulously investigate the spraying and cleaning mechanisms of the cartridge. Upon validating the precision and credibility of these numerical simulation methods， a Venturi-style guide pipe was devised to optimize the cleaning performance of the filter cartridge. The L16（4⁵） orthogonal test was carried out to determine the optimal range of blowing parameters for 3 m cartridges. The results showed that the radial pressure decay phenomenon occurred when the 3 m cartridge was 1.5 m away from the mouth of the bag， and the pressure distribution between the peak and trough in the middle and lower sections of the cartridge was non-uniform. The induced gas flow rate of the cartridge after the addition of a Venturi deflector was 1.47 times of that of the cartridge without a Venturi deflector， and the peak wall pressure and maximum reverse acceleration rose by 0.1 to 0.5 times， demonstrating that the addition of a Venturi deflector improved the peak wall pressure by increasing the induced gas flow rate. The results of the orthogonal tests showed that the peak wall pressure of the cartridge increased with the increase of blowing pressure and nozzle diameter but decreased with the increase of cartridge length； the optimal blowing time was 100 ms； there was an optimal blowing distance in the process of blowing， i.e.， it was 10 times the nozzle diameter. It is suggested that the blowing pressure should be 0.5 MPa without a Venturi deflector， while with a Venturi deflector， the blowing pressure should be 0.3 MPa to 0.4 MPa， the nozzle diameter should be 22 mm， and the blowing distance should be 220 mm.The research results can serve as a guideline for the design of cartridge blowing parameters and application.