二硝基甲苯加氢反应器气液两相的数值模拟

Numerical simulation of gas-liquid flow of hydrogenation reactor of dinitrotoluene

对二硝基甲苯加氢反应采用的六叶轮自吸式反应器进行改进,并对改进前后反应器的气液分散性能进行实验及计算流体力学(CFD)模拟研究;采用模拟软件ANSYS fluent对自吸式反应器分别在600 rpm、800 rpm、1000 rpm条件下进行数值模拟;获得了反应器内气液混合过程的流场、局部气含率和整体气含率。结果表明:反应器的局部气含率分布较均匀;近壁处设置挡板可以有效改善气液两相的分散性能;改进后的反应器使二硝基甲苯加氢反应的速度加快了近10%。

The self-inducing hydrogenation reactor of dinitrotoluene with six impeller were improved and studied in terms of experiments and the computational fluid dynamics （CFD） simulation. The content of the study was gas-liquid dispersion properties of the reactor before and after improvements. The simulation software ANSYS fluent was applied to simulate such reactor in the conditions of 600, 800, 1000 rpm, and the flow field, local air volume fraction and total air volume fraction were obtained. The results show that local air volume fraction distributes tmiformly; Setting up baffles near the wall can effectively improve the gas-liquid dispersion properties; The improved reactor promotes the speed of the hydrogenation reaction of dinitrotoluene by almost 10 %.