화학공학소재연구정보센터
홈 로그인 로그아웃 연락처 사이트맵
Korean Journal of Chemical Engineering, Vol.16, No.5, 677-683, September, 1999
DOI10.1007/BF02708151  Export Citation
An Analysis of Pressure Drop Fluctuation in a Circulating Fluidized Bed
Sang Hyun Kim, and Gui Young Han†
  • Department of Chemical Engineering, Sungkyunkwan University, Suwon, Korea
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The characteristics of pressure drop fluctuation in a 5.0 cm I.D.×250 cm high circulating fluidized bed with fine polymer particles of PE and PVC were investigated. The measurements of time series of the pressure drop were carried out along the three different axial locations. To determine the effects of coarse particles and relative humidity of air on the flow behavior of polymer powders-air suspension in the riser, we employed deterministic chaos analysis of the Hurst exponent, correlation dimension and phase space trajectories as well as classical methods such as standard deviation, probability density function of pressure drop fluctuation. From a statistical and chaos analysis of pressure fluctuations, the upper dilute region was found to be much more homogenous flow compared to that in the bottom dense region at the same operating conditions. It was also found that the addition of coarse particles and higher humidity of air reduced the pressure fluctuations, thus enhancing flow stability in the riser. The analysis of pressure fluctuations by statistical and chaos theory gave qualitative and the quantitative information of flow behavior in the circulating fluidized bed.
Keywords:Circulating Fluidized Bed;Pressure Drop Fluctuation;Hurst Exponent;Correlation Dimension
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