Article

Pressure Fluctuation Analysis of Laboratory Scale Air/Polyethylene Fluidized Beds

  1. Loni Schober1,
  2. Apostolos Kantzas1,3,*,
  3. Ron Hugo2

Article first published online: 19 MAY 2008

DOI: 10.1002/cjce.5450820203

Issue

The Canadian Journal of Chemical Engineering

The Canadian Journal of Chemical Engineering

Volume 82, Issue 2, pages 227–235, April 2004

Additional Information

How to Cite

Schober, L., Kantzas, A. and Hugo, R. (2004), Pressure Fluctuation Analysis of Laboratory Scale Air/Polyethylene Fluidized Beds. Can. J. Chem. Eng., 82: 227–235. doi: 10.1002/cjce.5450820203

Author Information

  1. 1

    Department of Chemical and Petroleum Engineering, University of Calgary, AB, Canada, T2N 1N4

  2. 2

    Department of Mechanical and Manufacturing Engineering, University of Calgary, AB, Canada, T2N 1N4

  3. 3

    Tomographic Imaging and Porous Media Laboratory, Calgary, AB, Canada

*Department of Chemical and Petroleum Engineering, University of Calgary, AB, Canada, T2N 1N4

Publication History

  1. Issue published online: 19 MAY 2008
  2. Article first published online: 19 MAY 2008
  3. Manuscript Accepted: 21 AUG 2003
  4. Manuscript Revised: 23 JUL 2003
  5. Manuscript Received: 22 JAN 2002

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Keywords:

  • pressure fluctatations;
  • fluidized bed;
  • polyethylene;
  • spectral analysis

Abstract

Differential pressure fluctuations were studied along the wall of a laboratory scale column filled with a polyethylene resin. Air flow rates to the column were varied in order to examine the changes in wall pressure with respect to superficial gas velocity. Statistical and spectral analysis was used to study the periodic features of column wall pressure measurements in the dense region of a fluidized bed. From the analysis, it is evident that multiple flow regimes exist in the column. These flow regimes are dependent upon the height above the distributor. Results also show a significant peak developing at 1 Hz as superficial gas velocity increases.

Les fluctuations de pression différentielle ont été étudiées le long de la paroi d'une colonne à l'échelle de laboratoire remplie de résine de polyéthylène. On a fait varier les débits d'air de la colonne afin d'examiner les changements dans la pression de paroi par rapport à la vitesse de gaz superficielle. On a eu recours à l'analyse statistique et spectrale pour étudier le caractère périodique des mesures de pression à la paroi dans la région dense d'un lit fluidisé. D'après l'analyse, il est évident qu'il existe des régimes d'écoulements multiples dans la colonne. Ces régimes d'écoulement dépendent de la hauteur au-dessus du distributeur. Les résultats indiquent également un pic significatif se développant à 1 Hz lorsque la vitesse de gaz superficielle augmente.

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