Effect of double-layer filter cartridge with an inner cone on the pulse-jet cleaning performance of cartridge dust collectors

The double-layer filter cartridge with an inner cone was designed to improve the pulse-jet cleaning performance of the filter cartridge. The flow field and pressure variation of the double-layer filter cartridge were investigated with the help of numerical simulations. The pressure at the inner wall of the filter cartridge was explored by varying three parameters: the height of the cone (h), the diameter of the cone (D) and the distance between the top of the inner cone and the baffle (H). The results showed that for conventional filter cartridge, influenced by the angle of the pulse-jet, the airflow got sufficiently expanded after the pulse-jet airflow reached the middle of the filter cartridge, and the pressure at the top of the filter cartridge was slight. It was found that the cone diameter and the distance between the top of the inner cone and the baffle had a significant effect on the pressure of the inner wall of filter cartridges, with the distance between the top of the inner cone and the baffle had the most excellent effect and the height of the cone had the slightest effect. Compared with conventional filter cartridges, the peak pressure at measurement point O1 of the optimized double-layer filter cartridge (h = 120 mm, D = 160 mm, H = 0 mm) was increased by 543.3%. The coefficient of variation (C.V.) of the pressure at the inner wall of the outer filter cartridge was significantly reduced, indicating that the pulse-jet cleaning effect of the optimized double-layer filter cartridge was significantly improved. This study can provide theoretical support to reveal the mechanism of pulse-jet cleaning of double-layer filter cartridges and technical support to optimize the design of double-layer filter cartridges.