Modelling of displacement washing of packed bed of fibers

Brazilian Journal of Chemical Engineering

S. Arora²  F. Potůček¹ 

[1] ,Punjabi University Department of Mathematics ,India

关键词: Displacement Washing;    Mathematical model;    Peclet number;    Biot number;   

DOI  :  10.1590/S0104-66322009000200016

来源: SciELO

【 摘 要 】

The mechanism of displacement washing of packed bed of porous, compressible and cylindrical particles, e.g., fibers, is presented with the help of an axial dispersion model involving Peclet number (Pe) and Biot number (Bi). Bulk fluid concentration, intra-pore solute concentration and concentration of solute adsorbed on the fiber surface are taken to be the function of washing time and position in the bed. Concentration of solute adsorbed on the fiber surface and intra-pore solute concentration are related by a Langmuir adsorption isotherm. Experiments have been performed on pulp beds formed from unbeaten, unbleached kraft fibers. Displacement washing has been simulated using a laboratory washing cell. Model equations are solved by using orthogonal collocation on finite elements (OCFE). Model predicted values are compared with the experimental values and key industrial parameters such as displacement ratio and efficiency are expressed in terms of exit and average solute concentrations.

【 授权许可】

CC BY   
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