IDENTIFICATION OF BED ZONES AND FLOW REGIMES IN SINGLE AND MULTIPLE SPOUT-OPERATED BEDS BY DIGITAL IMAGE PROCESSINGAND PRESSURE PROBES

摘要

Fluidized beds have a huge variety of applications in process industry. As the desired properties of the fluidized bed can strongly vary according to the process it is crucial to have proper knowledge of the flow regimes within the fluidized bed. In typical large scale applications in industry, fluidized beds are operated with one or more spout sections without background fluidization. In such cases it is necessary to minimize dead zonesbetween the spouts to avoid sticking of material in these areas. Spout operated beds also show some mixed regimes (like e.g. spoutswithin a bubbling bed). These mixed regimes might appear only within close borders of superficial velocity or bed height. Therefore, it is helpful to have regime maps (like presented by Link et al. (1)) or correlations to predict the bed behaviour for certain boundary conditions correctly.