Abstract
Substantial backflow of particles through the grid (grid leakage) in large industrial fluidized beds is highly undesirable because it can lead, among other things, to grid erosion or plugging and particle attrition. Experiments have been carried out to study the important factors that influence grid leakage. Leakage varied with bed height. Wave breakers and cone-shaped grid holes were found to reduce leakage drastically. Selecting the proper grid thickness reduced the grid leakage flux by up to 4 orders of magnitude. Grid leakage was shown to be caused by pressure fluctuations due to bubble formation at the grid and sloshing in the fluidized bed. This led to a mathematical model for grid leakage which was verified experimentally.
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