Study on Oil⁃Water Separation Characteristics of Hydrocyclone Based on CFD⁃PBM Numerical Simulation

doi:10.3969/j.issn.1006-396X.2021.04.010

Abstract

Abstract:

The flow field datributions of the hydrocyclone such as static pressure, tangential velocity and turbulent dissipation rate by loading PBM model and the conventional model, respectively. The results show that the two methods are approximately the same in the prediction of flow field characterics. Therefore, the CFD numerical simulation method based on the PBM model was used to simulate the separation characteristics of the hydrocyclone numerically. And the effects of the factors such as inlet flow rate, overflow split ratio, oil phase viscosity and density on the oil droplet size distribution and oil?water separation characteristics are explored. The results indicate that the separation efficiency of hydrocyclone increases firstly and then decreases with the rising of the inlet flow rate, and reaches a maximum efficiency of 98% as the processing capacity is 4 m³/h; the increase of the overflow split ratio is beneficial to improve separation efficiency; the radial force on the oil droplets decreases with the increasing of the viscosity of the oil phase, preventing aggregation and significantly reducing the separation efficiency as well; the higher density of the oil phase leads to larger the average oil droplet diameter of the tail pipe section and a reduced separation efficiency. Above all, the CFD?PBM numerical simulation method can be used to investigate the particle size distribution and variation characteristics of oil droplets in hydrocyclone, in order to reveal the separation mechanism of the hydrocyclone from different scales.

Key words: Hydrocyclone, Numerical simulation, Population balance model, Size distribution, Separation efficiency

摘要：

分析讨论了常规欧拉模型和耦合PBM下水力旋流器的静压力、切向速度及湍流耗散率等流场信息分布规律，结果表明在流场预测方面二者基本一致。在此基础上，采用基于PBM模型的CFD数值模拟方法，对水力旋流器的分离特性进行研究，并探究了不同入口流量、溢流分流比、油相黏度及密度等因素对油滴粒径分布以及油水分离特性的影响。结果表明，随着入口流量的增加，水力旋流器的分离效率呈先增大后减小的趋势，在处理量为4 m³/h时达到98%的最高分离效率；溢流分流比的增大有利于提升分离效率；随着油相黏度的增大，油滴受到的径向力减小，不易发生聚结，使分离效率明显降低；油相密度的增大导致尾管段平均油滴粒径的增加，使分离效率明显降低。总体而言，利用CFD?PBM数值模拟方法可以获得水力旋流器内部油滴粒径分布及变化特性，有利于从不同尺度揭示水力旋流器的分离机理。

关键词: 水力旋流器, 数值模拟, 群落平衡模型, 粒径分布, 分离效率

CLC Number:

TE964

Peng Jia, Jiaqing Chen, Xiaolei Cai, Lingzhen Kong, Chunsheng Wang, Chao Shang, Ming Zhang, Yi Shi. Study on Oil⁃Water Separation Characteristics of Hydrocyclone Based on CFD⁃PBM Numerical Simulation[J]. Journal of Petrochemical Universities, 2021, 34(4): 58-65.

贾朋, 陈家庆, 蔡小垒, 孔令真, 王春升, 尚超, 张明, 石熠. 基于CFD⁃PBM模拟水力旋流器油水分离特性研究[J]. 石油化工高等学校学报, 2021, 34(4): 58-65.

Figures/Tables 10

Fig.1 The schematic diagram of conventional tangential inlet hydrocyclone

Table 1 The model size of conventional tangential inlet hydrocyclone

D	D₁	D₀	D_u	a	b	D_m
40	80	4	20	14	14	14
L₁	L₂	L₃	L_u	L₀	α	β
80	114	764	800	50	20°	1.5°

Fig.2 The meshing diagram of conventional tangentialinlet hydrocyclone

Fig.3 The comparison of turbulent dissipation rate distribution

Fig.4 The sotel average diameter distribution of oil droplets

Fig.5 Distribution curve of flow field informationunder different flow rates

Fig.6 The influence of flow rate on average particle size and oil removal efficiency

Fig.7 The influence curve of overflow split ratio on average particle size and oil removal efficiency

Fig.8 The influence curve of oil phase viscosity on average particle size and oil removal efficiency

Fig.9 The influence curve of oil phase density on average particle size and oil removal efficiency

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