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利于多物理场耦合软件COMSOL Multiphysic,建立一个耦合CO变换反应传质、传热、动量传递和化学反应的二维轴对称拟均相固定床反应器模型。采用COMSOL Multiphysicl默认的反应流,稀物质传递(rfcs)模型和传热(ht)模型,通过内置的模型输入将二个模型耦合起来。催化动力学采用Langmuir-Hinshelwood方程,催化剂的性质及操作条件以Wei-Hsin Chen等的实验为基础。采用有限元法对模型进行稳态模拟,得到反应器内的速度场、浓度场、温度场,对反应床层内组分浓度、速度及温度进行可视化分析。将所得的结果与文献值进行对比,从而验证了模型的准确性。最后,采用COMSOL Multiphysic对催化反应条件进行灵敏度分析,分析了入口温度、催化剂失活因子、入口组成对床层温度及CO转化率的影响。
Which facilitates the COMSOL Multiphysic multi-physics coupling software to establish a two-dimensional axisymmetric quasi-homogeneous fixed-bed reactor model which combines the mass transfer, heat transfer, momentum transfer and chemical reaction of CO shift reaction. The COMSOL Multiphysicl default reaction flow, rfcs model and heat transfer (ht) model are used to couple the two models through a built-in model input. The catalytic kinetics using Langmuir-Hinshelwood equation, the nature of the catalyst and operating conditions Wei-Hsin Chen and other experiments based. The steady state simulation of the model was carried out by finite element method. The velocity field, concentration field and temperature field in the reactor were obtained. The concentration, velocity and temperature in the reaction bed were visualized. The obtained results are compared with the literature values to verify the accuracy of the model. Finally, COMSOL Multiphysic was used to analyze the catalytic reaction conditions. The effects of inlet temperature, catalyst deactivation factor and inlet composition on bed temperature and CO conversion were analyzed.