基于CFD的脂肪酸甲酯环氧化用液-液撞击流旋流反应器入口结构优化

Optimization of inlet structure of liquid-liquid impinging stream cyclone reactor for epoxidation of fatty acid methyl ester based on CFD

基于过氧甲酸催化脂肪酸甲酯环氧化反应,本文提出一种新型液-液撞击流旋流反应器,采用Eulerian双流体模型和湍流雷诺应力模型(RSM)对反应器内脂肪酸甲酯与过氧酸的冷态混合进行研究,并利用分散相的分散均匀度量化反应器撞击流接触腔内两相的混合水平。研究了两相入口角度、入口上升角度和入口相对位置对混合效果的影响。通过结果可知,撞击流接触腔内两相液体受撞击流的作用在流向导流腔的过程中逐渐混合均匀。以分散均匀度为衡量标准,当两相入口角度为60°、入口上升角度为10°、入口相对位置为5mm时,反应器的混合效果最好。

Based on the epoxidation of fatty acid methyl ester catalyzed by peroxyformic acid,a novel liquid-liquid impinging stream cyclone reactor was proposed.The cold mixing performance of fatty acid methyl ester and peroxyformic acid in the reactor was investigated using the Eulerian-Eulerian model and RSM turbulence model.Besides,the dispersion uniformity of the dispersed phase was used to quantify the mixing performance in the liquid-liquid impinging stream cyclone reactor.Moreover,the effects of the two-phase inlet angle,inlet rising angle and relative position of inlet on mixing efficiency were studied.The results showed that the two-phase liquid in the impinging stream contact cavity was gradually mixed evenly under the action of impinging stream.Characterized by dispersion uniformity,when the two-phase inlet angle was 60°,the inlet rising angle was 10°and the relative position of the inlet was 5mm,the mixing effect of the reactor was the best.