Effects of flow distributor structures and particle-wall interaction on baghouse gas-solid flow

Abstract

The uniform distribution of gas–solid two-phase flow inside the baghouse is a key factor in its performance. The Discrete Phase Model (DPM) was applied to study the flow characteristics and uniform degree of the flow distribution. The effect of flow distributor structures, characteristics of particles (such as size and restitution coefficient), and the particle–wall interaction on gas–solid two-phase flow were investigated by experiments and simulations. Results show that flow distributors greatly improve the uniformity of fluid distribution, while showing little effect on the filtration resistance. The flow distributors effectively avoid the occurrence of jet phenomena within the baghouse and significantly reduce the quality of dust on the surface of the filter bag. The weight has decreased by approximately 24.6 % in Case B (a flow distributor with four baffles perpendicular to the flow direction) compared to Case A (without a flow distributor and baffle). More particles will deposit on the surface of the filter bag with the increasing of restitution coefficient. The particle–wall interaction has a significant impact on particle motion when the particle sizes are larger than 150 μm, while the impact on particle motion is small when the particle sizes are smaller than 10 μm. These studies provide a basis for improving the uniformity of gas–solid two-phase flow inside the baghouse.