Stabilization and destabilization of slugging behavior in a laboratory fluidized bed
- Univ. of Tennessee, Knoxville, TN (United States)
- Oak Ridge National Lab., TN (United States). Engineering Technology Div.
In this paper, the authors present a method for feedback control of slugging in fluidized beds. Several recent studies have concluded that some modes of fluidization can be classified as low-dimensional and chaotic, implying a sensitivity to small perturbations that may be useful for control. The authors demonstrate here that selective application of small perturbations to a slugging bed of Geldart group D particles can greatly change the overall dynamics, permitting stabilization or destabilization of the slugging. They make control perturbations by injecting small pulses of fluidization gas through a nozzle located on the bed wall just above the distributor. Pulse timing and duration are adjusted based on feedback from the bed as indicated by pressure drop. The pressure drop is measured much faster than the slugging frequency, while control perturbations are made at time scales on the order of the dominant bed frequency. The time-averaged gas flow through the injector is typically less than 4% of the total gas flow through the bed. From experimental results the authors conclude that it may be possible to employ similar feedback control strategies in commercial fluidized beds of group D particles to enhance or reduce slugging.
- OSTI ID:
- 287960
- Report Number(s):
- CONF-950522-; ISBN 0-7918-1305-3; TRN: IM9639%%580
- Resource Relation:
- Conference: 13. international conference on fluidized-bed combustion, Orlando, FL (United States), 7-10 May 1995; Other Information: PBD: 1995; Related Information: Is Part Of 13. international conference on fluidized bed combustion: Proceedings. Volume 2; Heinschel, K.J. [ed.] [Air Products and Chemicals, Inc., Allentown, PA (United States)]; PB: 823 p.
- Country of Publication:
- United States
- Language:
- English
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