Flow patterns and velocity fields of granules in Dorfan Impingo filters for gas cleanup

Inside a two-dimensional model of the louvered Dot-fan Impinge panel with t ransparent front and rear walls the flow regions of filter granules without gas the cross-flow were observed. The white PE beads were used as filter g ranules. Colored PE beads served as tracers. Filter granules were discharge d and circulated to the bed. The flow rate of filter medium was controlled by the belt conveyor. The image processing system was used to record the gr anular flow. The flow patterns and the quasi-stagnant zones history in the moving granular bed were evaluated. The experiment showed that there exists a East central moving region (flowing core) of filter granules and two qua si-stagnant zones along the louver walls. The velocity fields in the moving bed in the Dorfan Impinge filter systems were also measured and analyzed. The results indicate that the velocity profiles of filter granules are infl uenced by the louver geometry. (C) 2000 Elsevier Science Ltd. All rights re served.