Magnetic Field-Enhanced Electrostatic Dust Collector Coupled with Wire Mesh Filtration
In response to the escalating challenge of industrial dust pollution, this study introduces a magnetic field-enhanced electrostatic dust collector integrated with wire mesh filtration. By applying an external magnetic field, the conventional electrostatic precipitation process is physically intensified. Systematic experiments compared discharge characteristics and dust removal efficiency with and without magnetic field intervention. The influence of wire mesh structural parameters was investigated, focusing on pore size (1, 2, 3 mm), number of stacked layers (1, 2, 3), and surface composite filtration materials (polyethylene filter mesh, polyamide mesh). Additionally, the effects of airflow velocity (1–5 m/s), inlet flow direction (forward/reverse), and dust type (fly ash, coal combustion dust, cement ash) on removal efficiency were tested. Results demonstrate that the optimized magnetic field-wire mesh coupling significantly enhances the charging and capture of fine dust. Specifically, smaller mesh apertures improve efficiency, with 1 mm yielding the best performance. Increasing the number of mesh layers effectively enhances efficiency at discharge voltages of 13–17 kV. Coating the mesh with either polyethylene or polyamide further improves efficiency, with negligible difference between the two materials. Reverse airflow direction results in lower effective gas velocity due to opposing gravity and drag forces, yet the combined magnetic and electric fields stabilize particle charging and enhance trajectory deflection, leading to improved overall performance. Dust resistivity is a critical factor: lower resistivity facilitates charging, while higher resistivity induces back corona, reducing efficiency. Magnetic field enhancement mitigates back corona and improves removal, particularly for high-resistivity cement ash. These findings offer a viable technical solution for efficient industrial flue gas dedusting.