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

doi:10.16085/j.issn.1000-6613.2024-0611

摘要/Abstract

摘要：

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。

关键词: 脂肪酸甲酯, 环氧化, 液-液撞击流旋流反应器, 分散均匀度, 计算流体力学

Abstract:

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.

Key words: fatty acid methyl ester, epoxidation, liquid-liquid impinging stream cyclone reactor, dispersion uniformity, computational fluid dynamics

中图分类号:

TQ052

邹鹏翔, 张明阳, 朱文杰, 郭耀骏, 程婕, 赵妍舒, 袁迎春. 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[J]. 化工进展, 2024, 43(S1): 166-173.

ZOU Pengxiang, ZHANG Mingyang, ZHU Wenjie, GUO Yaojun, CHENG Jie, ZHAO Yanshu, YUAN Yingchun. Optimization of inlet structure of liquid-liquid impinging stream cyclone reactor for epoxidation of fatty acid methyl ester based on CFD[J]. Chemical Industry and Engineering Progress, 2024, 43(S1): 166-173.

图/表 13

图1 LL-ISCR示意图

表1 LL-ISCR结构参数

名称	尺寸/mm	名称	尺寸/mm
撞击流接触腔横截面直径	50	溢流口直径	18
撞击流接触腔高度	276	底流口直径	18
剪切流混合腔高度	616	连续相入口直径	8
分离腔高度	616	分散相入口直径	8

表2 液体的物性参数

液体	密度/kg·m^-3	黏度/kg·ms
FAME	853	0.00248
过氧甲酸	1199	0.0055

表3 动量方程的表达式

名称	表达式
q相应力应变张量	$τ ¯ ¯ q = α q μ q ∇ ν q + ∇ ν q T + α q λ q - 23 μ q ∇ ν q I$
相间动量交换系数（K_pq ）	$K p q = α q α p α p f τ p$
微粒弛豫时间（τ_p ）	$τ p = ρ p d p 2 18 μ q$
曳力（f）	$f = C D R e 24$
阻力系数（C_D）	$C D = 24 1 + 0.15 R e 0.687 24, R e ≤ 1000 0.44, R e > 1000$

表3 动量方程的表达式

名称	表达式
q相应力应变张量	$τ ¯ ¯ q = α q μ q ∇ ν q + ∇ ν q T + α q λ q - 23 μ q ∇ ν q I$
相间动量交换系数（K_pq ）	$K p q = α q α p α p f τ p$
微粒弛豫时间（τ_p ）	$τ p = ρ p d p 2 18 μ q$
曳力（f）	$f = C D R e 24$
阻力系数（C_D）	$C D = 24 1 + 0.15 R e 0.687 24, R e ≤ 1000 0.44, R e > 1000$

图2 LL-ISCR网格划分

图3 网格无关性验证（网格-1的网格数量为199661，网格-2的网格数量为280058，网格-3的网格数量为387562，网格-4的网格数量为477733，网格-5的网格数量为554812，网格-6的网格数量为637464，网格-7的网格数量为1031373）

图4 不同轴向截面分散相浓度云图

图5 两相入口角度示意图

图6 不同入口角度对FAME分散均匀度的影响

图7 两相入口上升角度示意图

图8 不同入口上升角度对反应器混合性能的影响

图9 两相入口相对位置示意图

图10 不同入口相对位置对FAME分散均匀度的影响

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