Fractal analysis of pressure fluctuations in a three phase bubble column reactor operating at low pressure |
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Authors: | Yong Kang Jung Seob Shim Sang Do Kim Myung Han Ko Sang Done Kim |
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Affiliation: | (1) Department of Chemical Engineering, Chungnam National University, 305-764 Taejon, Korea;(2) Department of Chemical Engineering, KAIST, 305-701 Taejon, Korea |
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Abstract: | Pressure fluctuations in a three phase bubble column reactor operating at relatively low pressure (92 KPa) have been analyzed
by adopting the spectral and fractal analyses to get the engineering informations for the on-line control and fault diagnosis
of the reactors. The mean value, standard deviation, skewness and kurtosis of the pressure fluctuations have been obtained.
The local fractal dimension has been determined from the Pox diagram obtained by means of the rescaled range analysis of the
pressure fluctuations based on the fractional Brownian motion. The local fractal dimension of pressure fluctuations has increased
and thus the pressure fluctuation signals have become less persistent and irregular, with increases in the gas flow rate reaction
temperature, particle size and solid content in the slurry phase. The local fractal dimension has been well correlated in
terms of the operating variables. |
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Keywords: | Fractal Analysis Three Phase Bubble Column Low Pressure Pressure Fluctuations |
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