Pressure fluctuations in gas-solids fluidized beds--颗粒学报PARTICUOLOGY

Bi, H., & Chen, A. (2003). Pressure fluctuations in gas-solids fluidized beds. China Particuology, 1(4), 139-144. https://doi.org/10.1016/S1672-2515(07)60130-4

Pressure fluctuations in gas-solids fluidized beds

Hsiaotao Bi ^*, Aihua Chen

Fluidization Research Centre, Department of Chemical and Biological Engineering University of British Columbia, 2216 Main Mall, Vancouver, BC, V6T 1Z4, Canada

10.1016/S1672-2515(07)60130-4

Volume 1, Issue 4, September 2003, Pages 139-144

Received 15 March 2003, Accepted 22 June 2003, Available online 27 November 2007.

E-mail: xbi@chml.ubc.ca

Highlights

Abstract

Pressure fluctuation data measured in a series of fluidized beds with diameters of 0.05, 0.1, 0.29, 0.60 and 1.56 m showed that the maximum amplitude or standard deviation increased with increasing the superficial gas velocity and static bed height for relatively shallow beds and became insensitive to the increase in static bed height in relatively deep beds. The amplitude appeared to be less dependent on the measurement location in the dense bed. Predictions based on bubble passage, bubble eruption at the upper bed surface and bed oscillation all failed to explain all observed trends and underestimated the amplitude of pressure fluctuations, suggesting that the global pressure fluctuations in gas-solids bubbling fluidized beds are the superposition of local pressure variations, bed oscillations and pressure waves generated from the bubble formation in the distributor region, bubble coalescence during their rise and bubble eruption at the upper bed surface.

Graphical abstract

Keywords

bubbling fluidized beds; pressure fluctuations; maximum pressure amplitude; pressure waves; scaleup effect

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