不同流速下螺旋管内油水分离的数值模拟

摘要

油田开采的原油含有一定量的水,所以需要对含水原油进行油水分离使含水率达到要求才能投放市场.在目前使用的油水分离方法中,由于其他方法存在一定的缺陷,物理分离法得到了广泛应用.螺旋管分离器具有结构简单、重量轻等特点,成为目前最常见的一种离心分离器.采用计算流体力学中的VOF模型,利用商业仿真软件对具有不同入口速度的螺旋管内油水分离进行了数值模拟,得出了油水分离规律:离轴线越远,速度越小,速度较小时速度分布比较均匀；水相分布最大区域出现在每圈近入口的外侧；沿螺旋管轴向方向油水呈周期性的分离,当速度变大时高含水区向入口端靠近,分离效果好.该规律可为螺旋管分离器的改进和提高分离效率提供理论支持.%Crude oil from Oilfield mined containing certain amount of water, so it need to be done oil - water separation that its moisture content reach requirements and will be on the market. Due to other methods having some shortcomings, physical separation is widely used. Spiral pipe separator has the character of simpler structure and lighter weight, becoming one of the most common centrifugal separation methods. Adapting computational fluid dynamics of VOF model, using the simulation software, oil - water separation of different inlet velocity in spiral pipe was simulated, and the oil - water separation rule was obtained. The farther from the axis, the speed is smaller and the lesser velocity the evener distribution. The most regional of water and phase distribution appeared in each lap nearly entry outside. Oil - water separation is in a cyclical along with the axial. It supplies spiral pipe separation and improvement provides with a theoretical.