Particle shape is one of the most important parameters in the design and optimization of fixed‐bed processes. To address the impact of particle shape on methanol partial oxidation to formaldehyde over molybdate catalyst, packings of spheres, cylinders, rings, and trilobes are numerically generated. The generated packings are used to carry out resolved particle Computational Fluid Dynamics (CFD) simulations under industrial conditions. Pressure drop, voidage and velocity profiles, radial heat transfer, and local and overall conversion and selectivity results are presented. Despite their lower particle surface area, lower particle effectiveness and more uneven flow distribution than trilobes, and lower overall heat transfer coefficient than cylinders, rings had the best conversion and selectivity due to their balance between the factors. Three longer tubes of rings, rings and cylinders, and rings and trilobes are simulated and show a small gain in selectivity for the rings and trilobes.

中文翻译：

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使用CFD反应器建模，颗粒形状对固定床中甲醇部分氧化的影响

颗粒形状是固定床工艺设计和优化中最重要的参数之一。为了解决颗粒形状对在钼酸盐催化剂上甲醇部分氧化为甲醛的影响，数值生成了球，圆柱，环和三叶形填料。生成的填料用于在工业条件下进行解析粒子计算流体动力学（CFD）模拟。给出了压降，空隙率和速度分布图，径向传热以及局部和整体转化率和选择性结果。尽管它们的颗粒表面积较小，颗粒有效性比三叶形更低，流动分布更不均匀，并且总传热系数低于圆柱体，但由于它们之间的平衡，环具有最佳的转化率和选择性。