雷诺质流模型在填料床反应过程中的应用:Ⅰ.MEA吸收CO_2过程的模拟  

Reynolds Mass Flux Model and Its Application to Reaction Processes in Packed Bed:Ⅰ. Simulation of MEA-CO_2 Absorption Process

作　　者：李文彬[1] 刘伯潭[1] 余国琮[1] 袁希钢[1] 

机构地区：[1]天津大学化学工程研究所,天津300072

出　　处：《天津大学学报（自然科学与工程技术版）》2015年第5期379-387,共9页Journal of Tianjin University：Science and Technology

基　　金：国家自然科学基金资助项目(21176171;21376163)

摘　　要：工业中填料床往往处于湍流操作条件下,导致传质扩散呈现各向异性.针对填料床反应过程的预测,本文采用了雷诺质流模型,该模型的特点是通过直接求解雷诺质流方程来封闭湍流传质方程,从而准确表征填料床内湍流传质扩散的各向异性,得到更为准确的组分浓度、流体温度及速度分布.本文模拟了散堆填料塔内一乙醇胺溶液(MEA)-CO2化学吸收过程.模拟结果与文献报道的实验数据符合较好,验证了模型的可靠性.The mass diffusion in packed bed under turbulent condition, which is a common operating condition in industry, often shows anisotropy. In the present study, Reynolds mass flux model was applied for simulating the reaction processes in packed bed. The feature of the model is that the modeled Reynolds mass flux equation is used to close the turbulent mass transfer equation, therefore the anisotropic turbulent mass diffusion can be characterized with accuracy. With the proposed model, the distributions of concentration and temperature as well as the velocity were obtained. To validate the present Reynolds mass flux model, simulation of the chemical absorption of CO2 into aqueous MEA solution in packed bed was carried out. The simulated results were compared against the open experi- mental data and satisfactory agreement has been found between them.

关 键 词：填料床 吸收 模拟 各相异性湍流扩散 计算传质学 

分 类 号：TQ021.4[化学工程]