同心双锥型高含水油水两相管式旋流分离特性

Separation Characteristics of Concentric Double-Cone High Water Content Oil-water Two-phase Tubular Cyclone Separator

针对常规切向入口旋流分离器处理高含水采出液效果较差以及分离效率受入口流速影响较大等问题,率先提出中心细锥体和外筒倒锥体的同心双锥型油水两相管式分离构造。综合高含水率、大处理量等因素综合作用,建立油-水两相分离Mixture多相流模型和流场RNG k-ε湍流模型,并采用SIMPLE压力-速度耦合算法对模型进行求解,依据求解结果揭示同心双锥型管式分离腔室内旋流场的动态分布状况,量化分析中心锥角度变化对油水两相管式分离效率的具体影响程度,探究油滴粒径、入口流速等参数对管式旋流分离性能的作用机制。结果表明,随中心锥角度不断增加,同心双锥型管式旋流分离效率呈现先升高再降低的变化趋势,最佳中心锥角度为82°;增大油滴粒径能升高油池聚集性,有利于提升分离性能,当油滴粒径由0.3 mm增至0.6 mm时,分离效率由85.6%提至94.5%;入口流速对分离效率的影响相对较小,当入口流速由5 m·s^(-1)提至11 m·s^(-1),分离效率仅由93.3%升至96.9%,流速相差6 m·s^(-1)时,分离效率仅相差3.5%。

Aiming at the poor processing effect of conventional tangential inlet cyclone separator in processing high aqueous produced liquid and the separation efficiency greatly affectsd by the inlet flow rate,the concentric double-cone oil-water two-phase tubular separation structure of central fine cone and outer cylinder inverted cone was first proposed.The Mixture multiphase flow model and RNG k-εturbulence model of oil-water two-phase separation were established based on the comprehensive effects of high water content and large throughput,and the models were solved by SIMPLE pressure-velocity coupling algorithm.According to the solution results,the dynamic distribution of cyclone field in concentric double-cone tubular separation chamber was revealed,the specific influence degree of central cone angle change on oil-water two-phase tubular separation efficiency was quantitatively analyzed,and the role mechanism of oil droplet size,inlet velocity and other parameters on tubular cyclone separation performance was explored.The results showed that with the increasing angle of the central cone,the separation efficiency of concentric double-conical tubular cyclone showed a trend of first increasing and then decreasing,and the optimal center cone angle was 82°.When the particle size of oil droplets increased ow rate had a relatively small effect on the separation efficiency,and when the inlet flow rate was increased from 5 m·s^(-1)to 11 m·s^(-1),the separation efficiency only increased from 93.3%to 96.9%,and the separation efficiency difference was only 3.5%when the flow rate difference was 6 m·s^(-1).