Evaluating the Influence of Filter Membrane on Dust Particle Deposition and Detachment Based on CFD-DEM Method

The motion of dust particles significantly affects the service life and filtration efficiency of filter elements. By employing a coupled computational approach combining Computational Fluid Dynamics and Discrete Element Method (CFD-DEM), the Johnson-Kendall-Roberts (JKR) model was incorporated into the calculation of adhesive forces between particle-particle and particle-wall interactions. The influence of the membrane layer on dust particle deposition and detachment on the surface of filter elements was investigated through simulation analysis. The influence of membrane layers on the deposition and detachment of dust particles in filter elements was investigated. The results show that the addition of the membrane layer led to a 35.5% increase in the initial filtration pressure drop of the filter. However, it concurrently resulted in a diminution of the deposition depth of dust particles. By the eighth cycling period, the deposition depth of the filter element with membrane (FWM) was 2.5 mm, which was only half that of the filter element without membrane (FOM). Moreover, it was found that the cleaning efficiency of the FOM is more sensitive to reverse flow pressure, while the cleaning efficiency of the FWM is more sensitive to the duration of pulse width. These findings can help explain the mechanism of dust particle deposition and detachment and provide a basis for the design and manufacturing of filter elements.