Simulation of fixed-bed adsorption process considering particle size distribution  

作　　者：Zhaoyuan Zhang Yidan Shu 

机构地区：[1]School of Materials Science and Engineering,Sun Yat-sen University,Guangzhou 510275,China [2]The Key Laboratory of Low-carbon Chemistry&Energy Conservation of Guangdong Province,Guangzhou 510275,China

出　　处：《Chinese Journal of Chemical Engineering》2024年第10期175-189,共15页中国化学工程学报（英文版）

基　　金：the National Natural Science Foundation of China (21706075);Guangzhou Municipal Science and Technology Project (202201011269)

摘　　要：The distribution of adsorbent particle sizes typically has a significant impact on adsorption performance.Most fixed-bed adsorption studies adopt the assumption of average particle size to simplify the adsorption model,but this does not eliminate the deviation between experiments and simulations caused by particle size distribution in practice.In this study,the population balance equation(PBE)and fixed-bed adsorption kinetics model were combined to simulate the adsorption process in a fixed-bed reactor,modeling the distribution of adsorbate uptake over time on adsorbent particles of different sizes.We integrated and optimized the PBE and fixed-bed mass transfer model in the algorithm,and the resulting combined model adopts a variable time step size,which can achieve a balance between computational efficiency and error while ensuring computational convergence.By slicing the model in the spatial dimension,multiple sets of PBE can be calculated in parallel,improving computational efficiency.The adsorption process of single-component and multi-component CO_(2)/CH_(4)/N_(2)on 4A zeolite without binder was simulated,and the influence of adsorbent particle size distribution was analyzed.Simulation results show that the assumption of average adsorbent particle size,which was commonly made in published work,will underestimate the time required for adsorbates to break through the fixed bed compared with the assumption of uniform adsorbent particle size.This model helps to consider the impact of adsorbent particle size distribution on the adsorption process,thereby improving the prediction accuracy of adsorbent performance.

关 键 词：Population balance equation Particle size distribution Fixed-bed adsorption 

分 类 号：TQ051.14[化学工程] O647.3[理学—物理化学]