Calculation method and impact analysis of short-circuit flow in dynamic hydrocyclone

doi:10.16085/j.issn.1000-6613.2024-0110

Abstract

Abstract:

Short-circuit flow is a crucial factor that affects the separation efficiency of hydrocyclones. However, there is limited research on the form and calculation methods of short-circuit flow in dynamic hydrocyclones. In this study, a numerical simulation method was proposed to analyze the radial velocity variations and streamline at the overflow pipe outlet of dynamic hydrocyclone. Taking the dimensionless high sensitivity structural parameters of the dynamic hydrocyclone as input indicators and the short-circuit flow rate ratio obtained from numerical simulation as the response target, the calculation model between the dimensionless structural parameters and the short-circuit flow rate ratio were established by the response surface method. Based on the established model, structural improvements were made to a dynamic hydrocyclone with a single tube processing capacity of 120m³/h. The improved design resulted in a 59.6% reduction in short-circuit flow rate, a 10.4% increase in separation efficiency. Subsequently, a prototype of the improved dynamic hydrocyclone with a single tube processing capacity of 120m³/h passed the experimental verification on an offshore oil platform. The average error between the experimental separation performance and the simulated predicted separation efficiency was only 4.9%.

Key words: dynamic hydrocyclone, short-circuit flow, computational model, numerical simulation, field test

摘要：

短路流是影响水力旋流器分离效率的重要因素，然而针对动态水力旋流器中短路流的形式和计算方法鲜有研究。本文通过数值模拟的方式对动态水力旋流器溢流管口处径向速度变化和流线分布规律，提出了一种基于数值模拟的动态水力旋流器短路流流量计算方法。将量纲为1的动态水力旋流器高灵敏度结构参数作为输入指标，以数值模拟所得的短路流率作为响应目标，通过响应曲面法建立了量纲为1的结构参数与短路流率间的计算模型。基于所建立的模型，使单管处理量为120m³/h的动态水力旋流器进行结构改进，改进后短路流流量减少了59.6%，分离效率提高了10.4%，基于该方法改进的单管120m³/h处理量动态水力旋流器中试样机通过了海上石油平台上的试验验证，且试验分离性能与模拟预测分离效率间的平均误差仅有4.9%。

关键词: 动态水力旋流器, 短路流, 计算模型, 数值模拟, 现场试验

CLC Number:

TE952

YU Hai, LUAN Zhiyong, JI Yipeng, AN Shenfa, CHEN Jiaqing, SI Zheng, REN Qiang, SUN Fengxu, SONG Zerun. Calculation method and impact analysis of short-circuit flow in dynamic hydrocyclone[J]. Chemical Industry and Engineering Progress, 2025, 44(1): 135-144.

于海, 栾智勇, 姬宜朋, 安申法, 陈家庆, 司政, 任强, 孙丰旭, 宋泽润. 动态水力旋流器内短路流流量的计算方法及影响分析[J]. 化工进展, 2025, 44(1): 135-144.

Figures/Tables 20

References 23

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相	密度 /kg·m^-3	黏度 /mPa·s	粒径尺寸 /μm	体积分数 /%	入口流量 /m³·h^-1
水	998.2	1.013	—	99.9	120
油	934.0	40	158	0.1	120

相	密度 /kg·m^-3	黏度 /mPa·s	粒径尺寸 /μm	体积分数 /%	入口流量 /m³·h^-1
水	998.2	1.013	—	99.9	120
油	934.0	40	158	0.1	120

量纲为1数	量纲归一化	水平
量纲为1数	量纲归一化	-1	0	1
α	D/D₀	1	1.21	1.42
β	d_s/D	0.42	0.45	0.48
γ	t/d_s	-0.5	0.25	1
δ	i/d_s	0.17	0.21	0.25
σ	Q_sc/Q_in×100%

量纲为1数	量纲归一化	水平
量纲为1数	量纲归一化	-1	0	1
α	D/D₀	1	1.21	1.42
β	d_s/D	0.42	0.45	0.48
γ	t/d_s	-0.5	0.25	1
δ	i/d_s	0.17	0.21	0.25
σ	Q_sc/Q_in×100%

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