Effect of filter granules properties on flow behavior in a moving granular filter

Abstract

The moving granular filter technology based on size segregation is a hot gas purification technology which is expected to be applied in large-scale industrial applications. We studied the effect of granule size ratio (γ), surface friction coefficient (μs), and equivalent granule density (ρe) on the degree of size segregation of two-component granules based on the discrete element method (DEM). We also experimentally investigated the difference in flow behavior between single-component and two-component granules before and after dust attachment. Results showed that the degree of size segregation increased rapidly when γ < 2, and decreased slowly when γ > 2. μs and ρe had little effect on the degree of size segregation. When the dust concentration C = 0–24.0 g/m3, the adhesion of dust can increase the granule falling velocity, the maximum was about 1.66 times that without dust. High dust deposition rate weakened the lifting effect.