Numerical study of cleaning performance and flow field characteristics of chuck type filter cartridges

Filter cartridges have a high collection efficiency for fine particles and are used to reduce and control pollution. A chuck structure is installed on the top of the cartridge to allow for quick installation and removal of the cartridge. However, the inner diameter of chucks used in industry is usually smaller than the outer diameter of the cartridge, resulting in the actual outlet area of the cartridge being only about 70% of the theoretical outlet area. To better design and optimize the filter cartridge dust collector, analyzing the flow characteristics inside the cartridge with the chuck installed was necessary. In this work, Peak static pressure and comprehensive pressure (PC) are used as indexes to study the influence of different types of chuck over the performance of cleaning from cartridges, as well as to analyze the flow characteristics within the cartridge under different conditions. It was shown that chucks improve the cartridge cleaning performance by increasing the peak static pressure in the upper part, resulting in a maximum of 167.4% compared to no chuck. Enhancement of cleaning performance at the top of chucked cartridges is caused by airflow buildup, while enhancement of air permeability at the top cuts down on the cleaning intensity, so the improvement of cartridges by breathable chucks is always lower than that of common chucks. In addition, based on the trend of the overall cleaning strength of the cartridge, we obtained the jet diffusion angle and the formula for the optimal chuck inner diameter, which helps to choose the parameters of the chuck more conveniently in practical applications.