Predicting bed expansion and phase holdups for three-phase fluidized-bed reactors with and without biofilm

被引:37
作者
Yu, HB [1 ]
Rittmann, BE [1 ]
机构
[1] NORTHWESTERN UNIV,DEPT CIVIL ENGN,EVANSTON,IL 60208
关键词
biofilm reactors; fluidized bed; hydrodynamics; modeling; phase holdup; three-phase; wake theory;
D O I
10.1016/S0043-1354(97)00102-4
中图分类号
X [环境科学、安全科学];
学科分类号
08 ; 0830 ;
摘要
A predictive model is developed for the hydraulic behavior, such as bad height and overall gas, liquid, and solid holdups (volume fractions), of three-phase fluidized-bed reactors. The model uses process parameters, such as reactor dimensions, particle properties, and gas and liquid flowrates, as input variables. A wake model is applied to predict the liquid holdup, while the solids holdup is obtained by iteration based on material balance. Experimental results to evaluate the three-phase fluidization model are obtained from a laboratory-scale reactor using two sizes of clean glass beads under wide range of gas and liquid velocities. Modeling predictions and experimental results agree quantitatively for two-phase and three-phase conditions. The model is further applied to analyze fluidized beds with biofilm-coated media. Biofilm accumulation alters the drag coefficient (Go) and bed expansion index (n). Applying a modified correlation for Co to biofilm systems found in literature, the authors propose a new correlation for n which shows little dependence on the particle terminal Reynolds number. (C) 1997 Elsevier Science Ltd.
引用
收藏
页码:2604 / 2616
页数:13
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