Abstract
This study was targeted at understanding the local flow and flooding behaviors of fluidized bed strippers. Beddensity, pressure fluctuations andbubble void fraction were measured in a 0.6 m diameter stripper fordisk and donut, as well as gratinginternals using FCC catalyst particles.The gratingstripper had a higher bed density andoperatedsmoothly without flooding over a wider range of gas and solids flows than the disk and donut stripper. Flooding in thedisk and donut stripperwas a sudden rather than a gradual occurrence when a limiting solids flux was exceeded.Increasing fines composition and addingholes to the disk and donut traysmitigatedflooding to some extent.The gratings stripper had flattened parabolic radial bubble void fraction profiles whereas the disk and donut stripper had characteristic M-shape profiles. The results hereare expected to be valuable for the operation and design of gas-solids fluidized bed strippers.
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