Study on the influence of built-in open-hole dust cleaner on the cleaning performance of cartridge filter

Pleated cartridge dust collectors are widely used in various industrial production environments, in its use, pulsejet cleaning is a crucial step. Despite the importance of pulse-jet cleaning, there was a widespread problem of uneven cleaning in the upper part of the filter cartridge. In this paper, a built-in open-hole dust cleaner (BODC) was developed to improve the pulse-jet cleaning performance, ameliorate the problem of uneven cleaning and prolong the filter cartridge's service life. The filtration and pulse-jet cleaning test system was established to verify the effect of BODC. Based on the comprehensive comparison and analysis of pulse-jet pressure at the four types of measuring points, the best BODC in this experiment is 6 mm 4 holes with composite pressure of 1.52 MPa. The best BODC and ordinary nozzle were compared with respect to pressure drop. The results showed that the change rule of pressure drop of BODC is similar to that of the ordinary nozzle. The average filtration cycle of BODC and ordinary nozzle was 1300 s and 928 s, respectively. The dust emission concentration of the dust collectors of both cleaning methods during filtration was 1.354 mg/m3 and 1.412 mg/m3, respectively. A significant improvement in cleaning uniformity has been demonstrated when the BODC is used. Ultimately, the best BODC in this experiment was applied on site at the excavation face of Donghuantuo Coal Mine, which resulted in an average dust removal efficiency of 95.2% for total dust and 93.2% for respirable dust, with no residual dust left in the upper part of the filter cartridge after cleaning.