Study on Dilute Performance of Follow⁃Up Dynamic Mixer

doi:10.3969/j.issn.1006-396X.2021.04.011

Abstract

Abstract:

Because of the ineffective dilution process of heavy oil of the primary mixers, the face type spiral blade was selected as the mixing element and the dynamic impeller was added as well, in order to enhance the shear capacity and rotation frequency of the blade. The two parameters of blade pitch and power impeller that effect the mixing effect of the dynamic mixer were numerically simulated and analyzed using the CFD simulation software. Taking the volume distribution of thin oil in the tube as the evaluation standard, the influence of geometric structure of the mixing element to performances of the mixer during the mixing process was studied. The results show that if the blade pitch is too small, it will hinder the flow of fluid in the tube causing the decrease of mixing rate, and if it is too large, it will cause the fluid forward channeling. Much fewer power impellers will reduce the frequency of component rotation, but much more ones will hinder the forward flow of fluid. Finally, the mixing performance of the novel optimized follow?up dynamic mixer was compared with the original mixer. The volume distribution of the thin oil in the new follow?up dynamic mixer is more uniform, which can greatly enhance the mixing effect of thick oil, and is also beneficial to the exploitation of heavy oil resources.

Key words: Heavy oil mixed with dilute, Dynamic mixer, Numerical simulation, Spiral blade

摘要：

针对稠油掺稀过程中原混合器混合效果不佳的问题，选择满面式螺旋叶片作为混合元件，增加动力叶轮，以增强叶片对流体的剪切能力和转动频率。基于CFD仿真软件，对影响动态混合器混合效果的叶片螺距和动力叶轮两参数进行数值模拟分析，并以管内稀油体积分布情况作为评价标准，研究混合过程中混合元件几何结构的变化对混合器性能的影响规律。结果表明，叶片螺距过小将阻碍流体在管内流动，导致混合速率降低，过大则会产生流体前窜现象；动力叶轮过少则会降低元件转动频率，过多则会阻碍流体向前流动。最后将优化后的新型随动式动态混合器与原混合器混合性能进行对比，新型随动式动态混合器内稀油体积分布更为均匀，能够更好地增强稠油掺稀混合效果，有利于稠油资源的开采。

关键词: 稠油掺稀, 动态混合器, 数值模拟, 螺旋叶片

CLC Number:

TE35

Yuexin Li, Chunli Zhao, Yuzhu Zhang, Yue He, Shuangchun Yang. Study on Dilute Performance of Follow⁃Up Dynamic Mixer[J]. Journal of Petrochemical Universities, 2021, 34(4): 66-71.

李悦欣, 赵春立, 张玉柱, 何跃, 杨双春. 随动式动态混合器掺稀混合性能研究[J]. 石油化工高等学校学报, 2021, 34(4): 66-71.

Figures/Tables 13

Fig.1 Schematic diagram of dilution under pump

Table1 Parameters of heavy oil and thin oil

油品	动力黏度/（mPa·s）	密度/（kg $⋅$ m^-3）	流速/（m $⋅$ s^-1）
稠油	4 700	970	0.45
稀油	20	820	0.45

Table1 Parameters of heavy oil and thin oil

油品	动力黏度/（mPa·s）	密度/（kg $⋅$ m^-3）	流速/（m $⋅$ s^-1）
稠油	4 700	970	0.45
稀油	20	820	0.45

Fig.2 Original hybrid element structure

Fig.3 Original dynamic mixer structure

Fig.4 Volume fraction distribution of thin oil at Z=420 mm section of original dynamic mixer

Fig.5 Volume fraction distribution of dilute oil in the mixing process

Fig.6 New hybrid element structurer

Fig.7 New structure of dynamic mixer

Table 2 Structure dimension table of new dynamic mixer

结构参数	数值
混合器长度L/mm	460
混合器内径D/mm	50
稠油入口直径d/mm	34.34
螺旋叶片直径a/mm	40
中心轴直径b/mm	8
螺旋叶片总长l/mm	200
螺旋叶片螺距p/mm	30、40、50、60
动力叶轮叶片倾角β/（°）	30
动力叶轮叶片数量n/个	4、5、6、7

Fig.8 Volume fraction distribution of thin oil in pipe with different pitch

Fig.9 Volume fraction distribution of thin oil in pipe with different number of blades

Fig.10 Comparison of volume fraction distribution of thin oil in pipe

Fig.11 Thin oil volume fraction distribution curve at Z=420 mm section

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