仰角式油水分离器流场的数值模拟

Numerical Simulation of Flow Field of the Inclined Oil-Water Separator

仰角式油水分离器是一种新型、高效的重力式油水分离设备,为了深入了解其分离机理和内部流场分布,利用Fluent 12.0数值模拟计算软件,基于多相流欧拉分析方法,结合Realizable k–ε双方程湍流模型对油水两相在分离器内的分离过程进行了数值模拟。结果表明:所选用的数值模拟方法能够较为真实地反映分离器的分离特性和内部流场分布,与传统卧式分离器相比较,仰角式油水分离器内堰板处的"死油区"和"死水区"明显减小,油水分离效率更高,当仰角为12时,油水分离效率达到了最高值90.48%,提高了29.26%;仰角式分离器的结构简单,但内部流场分布较为复杂,入口分液管处的速度分布不均匀,存在不同程度的旋流,易造成油水两相在分界面处的掺混;分液管处的结构有待于进一步地改进。

The inclined oil-water separator is a new and high efficient gravity separation equipment.In order to analyze the separation mechanism and the internal flow distribution of the inclined oil-water separator,this article uses Fluent 12.0 numerical simulation software,and Elulerian multiphase-flow model combined with the Realizable k–＂ two equation turbulent model to simulate the oil and water separation process in the separator.The results show that the method of numerical simulation can better reflect the separation performance and internal flow field distribution.Compared with the conventional horizontal separator,the＂dead zone＂of water and oil in the weir plate of the inclined oil-water separator is obviously reduced,and the separating efficiency is higher.Oil and water separation efficiency is 90.48% when the angle is 12.the separation efficiency increased 29.26%.Inclined oil-water separator has the advantage of simple structure,but the internal flow field is very complex. The velocity distribution of the entrance liquid separating pipe is not uniform and there exists different degree of cyclone.This can cause oil and water mixing in the interface.Therefore,the structures of entrance liquid separating pipe need to be further improved.