Y型管式油水分离结构分离特性仿真分析

Numerical simulation of oil-water separation characteristics in Y-tube

管式油水分离技术具有占地面积小、分离效率高、成本低等优点,基于管式油水分离原理,设计一种Y型管式油水分离结构,利用Fluent数值模拟软件,采用标准k-ε湍流模型和Mixture多相流模型,对Y型管内部流场特性以及外部参数对分离效率的影响进行了研究。结果表明,Y型管对流体扰动小,内部流场特性稳定不易产生涡流,能够实现油水分离,支管与主管交汇处存在油水分离现象;油水分离效率随着油滴粒径的增大而逐渐提高,油滴粒径越大越利于油相上浮聚集在Y型管上层,能有效提高油水分离效率;入口速度对油水分离效果的影响很大,速度越大,油相上浮时间越短,Y型管的分离效率越低;分离效率随支管分流比的增大而增大,当入口速度为0.5 m/s时,分流比超过0.4后,分离效率不再增加。研究结果为油水分离提供了新思路,可为Y型管的设计提供理论参考。

Pipeline-type oil-water separation technology has the advantages of small footprint,high separation efficiency and low cost.A Y-type tubular oil-water separation structure was designed based on the principle of pipeline-type oil-water separation.The effects of internal flow field and external parameters on separation efficiency of Y-tube were studied by adopting standard k-ε turbulence model and mixture multiphase flow model in Fluent numerical simulation software.The results showed that the Y-shaped tube had little disturbance to fluid,stable internal flow field characteristics and was not easy to generate eddy current,which could realize oil-water separation.There was oil-water separation at the junction of branch pipe and main pipe.The oil-water separation efficiency increased gradually with the increase of the oil droplet size.The larger of the oil droplet size,the better the oil phase will float and gather in the upper layer of Y-shaped tube,which effectively improved the oil-water separation efficiency.The inlet velocity had a great influence on the oil-water separation effect.The higher the inlet velocity,the shorter the oil phase floating time,and the lower the separation efficiency of Y-shaped tube.The separation efficiency increased with the increase of branch shunt ratio.When the inlet velocity was 0.5 m/s,the separation efficiency would not increase when the shunt ratio exceeded 0.4.The results provided a new idea for oil-water separation and a theoretical reference for the design of Y-shaped tube.