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颗粒内传热传质对IAH-CHP固定床放热反应器性能具有重要影响.本文建立了管径和催化剂颗粒直径之比n=4的圆柱形放热反应器120°的三维局部模型,使用Fluent商业软件对模型内流场、组分和温度分布进行了模拟研究.重点研究了颗粒内传热传质特性对组分分布、温度分布、异丙醇产量及选择性的影响,并给出了最优的催化剂颗粒直径dp和催化剂内部微孔直径d0值.模拟结果表明,颗粒内温度分布较均匀,对反应影响不明显;大的dp值和小的d0值会显著增大催化剂颗粒内部的反应物浓度和反应速率梯度,降低催化剂的使用效率,降低异丙醇选择性.优化模拟结果说明,对于丙酮高温加氢放热反应,球形催化剂颗粒应选择催化剂颗粒直径1 mm,微孔直径10 nm.
Particulate heat and mass transfer plays an important role in the performance of IAH-CHP fixed-bed exothermic reactor.Three dimensional local models of 120 ° cylindrical exothermic reactor with a tube diameter and catalyst particle diameter ratio n = 4 are established. Fluent commercial software was used to simulate the flow field, composition and temperature distribution in the model, and the influence of the heat and mass transfer characteristics on the distribution of components, temperature distribution, isopropanol yield and selectivity was also studied. The optimal catalyst particle diameter dp and catalyst internal pore diameter d0 values were obtained.The simulation results show that the temperature distribution in the particles is more uniform and the effect on the reaction is not obvious.The large dp value and small d0 value will significantly increase the internal diameter of the catalyst particles Of the reactant concentration and reaction rate gradient to reduce the catalyst efficiency and reduce the isopropanol selectivity.The simulation results show that for the high temperature hydrogenation exothermic reaction of acetone, the spherical catalyst particles should choose the catalyst particle diameter of 1 mm, pore diameter 10 nm.