Abstract
Abstract Motion of solids, jetting and bubbling dynamics were studied in a large jetting fluidized bed, 3 m in diameter and 10 m in height, by analyzing the local bed density fluctuations. The effects of changing the gas and solid flow rates in the jet, the configuration of the jet nozzles, and the initial bed height were systematically studied. The findings on bubbling dynamics and jetting phenomena compare favorably with the results obtained independently from the analysis of high-speed movies of the bed operation. The slugging frequency is found to be a weak function of the inverse of the initial bed height. The jet penetration length is found to be primarily controlled by the large bed height and the large-scale bed fluctuations. Semi-quantitative results indicate that the solid circulation rate increases linearly with increase in the jet gas flow rate.
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