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Residence times in fluidized beds with secondary gas injection

✍ Scribed by D. Christensen; J. Nijenhuis; J.R. van Ommen; M.-O. Coppens

Publisher
Elsevier Science
Year
2008
Tongue
English
Weight
518 KB
Volume
180
Category
Article
ISSN
0032-5910

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✦ Synopsis

Experiments were carried out to determine the effects of secondary gas injection on the gas residence time and macromixing characteristics in a bubbling fluidized bed. Primary gas is introduced via a bottom distributor plate, while secondary gas is introduced via a fractal injector submerged in the bed. Results indicate that the average residence time decreases only slightly. Calculated overall reactor PΓ©clet numbers indicate that the gas experiences less back-mixing with secondary gas injection. The bubble size was observed to decrease by up to 70%, indicating improved gassolid contact. Taking this improved contact and plug flow behavior into account, the conversion in a fluidized bed with secondary gas injection is expected to increase significantly, particularly for mass-transfer limited reactions.

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