T型管油水分离特性数值模拟

Numerical Simulation of Oil-Water Separation Characteristics in Tee Tube

采用Mixture多相流模型研究T型管内油水两相流动特性,研究了入口含油率、出口分流比、入口速度、支管段长度、主管出口段长度等因素对T型管分离效率的影响.结果表明,支管与主管连接处存在油相聚集及油水分离现象,其中主管油相聚集主要由重力分层导致,而支管油相聚集主要是密度差导致的离心分离.入口位置含油率对T型管的分离效率影响大,随入口含油率增大,T型管的分离效率降低,T型管适用于含油率较低的油水混合物的分离.支管分流比越大,T型管分离效率越高,生产现场可考虑在主管出口段采取节流措施以提高T型管的分离效率.T型管分离效率对支管段及主管出口段长度不敏感,T型管可仅按制造安装要求设计.

The flow field of oil-Water in tee tube by using mixture multiphase model was studied, in addition to study the separation efficiency of tee tube response to the ratio of oil at inlet,the split ratio at outlet, the velocity of inlet, the length of branch tube and the length of main tube. The result show that：oil gathered and separated at the intersection of branch tube and main tube. The reason of oil gathered at main tube was caused by the gravity, and at branch tube, oil gathered phenomenon was mainly due to the centrifugal separation caused by the density difference between oil and water. Oil content at main entrance significant influence on separation efficiency of tee tube, and separation efficiency reduced with the increase of inlet oil content, so tee tube separator suit for separating the oil-water which has low oil content. Study result shows the efficiency would be increased when increased the split ratio, that means that can improve the separation efficiency by mounting throttle at outlet of main tube. The separation efficiency is not sensitive to the length of branch tube and outlet of main tube, so it can be only in accordance with the requirements of the manufacturing and installation in tee tube design process.