背压对脱水除油一体式液液分离旋流器流场及分离性能影响的研究

Effect of Back Pressure on the Inner Flow Field and Separation Performance of a Deoiling-Dewatering Hydrocyclone

应用FLUENT流体动力分析软件,对脱水除油一体式液液分离旋流器进行了数值模拟,分析了底流背压、溢流背压对旋流器速度分布、流量分率及分离效率的影响。结果表明,底流背压和溢流背压对旋流器流量分率的影响可归结为压降比的影响;底流背压和溢流背压对旋流器分离效率的影响可归结为底流分率的影响;牛顿效率比传统的除油效率和脱水效率更能全面地表征旋流器油水分离的性能。随着底流分率的增大,牛顿效率先升高再降低,存在一个最佳操作点。研究结果及新的表征方法对旋流器的研究和实际应用具有指导意义。

A deoiling-dewatering liquid-liquid hydrocyclone was simulated using CFD to analyze the influence of underflow and overflow back pressure on the flow field and separation efficiency of the hydrocyclone. Results show that the effect of the underflow back pressure and the overflow back pressure on flow ratio of the hydrocyclone could be attributed to the influence of the pressure drop ratio; the effect of the underflow back pressure and overflow back pressure on the separation efficiency of the hydrocyclone could be attributed to the influence of flow ratio or underflow ratio; the Newton efficiency was more comprehensive to represent the separation performance of the hydrocyclone compared with traditional deoiling and dewatering efficiency. The Newton efficiency increased first then decreased with increase in underflow ratio and existed a point where the separation performance peaked. The results and new representing methods could be used as a guide for the research and application of liquid-liquid hydrocyclones.