导流片型旋流场内油滴聚并影响因素研究

Investigation into influence factors of oil droplet coalescence in swirling flow field of vane-type hydrocyclone

导流片型旋流器具有体积小、重量轻和效率高等优点,适用于井下以及海上平台等空间有限的场所。该文通过实验和数值模拟研究了导流片型旋流场中流量、油水界面张力、油相含率、油相黏度及油相粒度等因素对于离散相油滴聚并的影响。研究结果表明:随着流量增加,油滴聚并效果先增加后下降,当流量介于14 m^3/h-16 m^3/h之间时,可以使油滴聚并达到最佳的效果;提高油相含率能够增加大油滴的比例,同时也增加了小油滴的数量,因此在进行油水分离时排出的水相中会残留较多的油相;提高入口油相粒度和降低油相黏度,可以促进油滴的聚并;增大油水界面张力可以减小油滴破碎的概率,提高油水分离效率。这些研究结果对于导流片型旋流器的设计能起到一定的指导作用。

The vane-type hydrocyclone has the advantages of small size, light weight and high efficiency so that it is suitable for the scene with limited space, such as underground and offshore platform. In this work, the effects of flow rate, oil-water interfacial tension, oil concentration, oil viscosity and oil particle size on the characteristics of oil droplets coalescence are studied by numerical simulation and experimental test. The results show that with the increase of flow rate, the coalescence effect of oil droplets increases first and then decreases. When the flow rate is between 14 m^3/h and 16 m^3/h, the oil droplets coalescence can achieve the best result under this working condition. Increasing the oil concentration can increase the proportion of large oil drops and also increase the number of small oil drops. Thus, during the oil-water separation, more oil droplets will remain in the discharged water phase. Increasing the inlet oil particle size and reducing the oil viscosity can promote the coalescence of oil droplets. Increasing the oil-water interfacial tension can reduce the probability of oil droplet breakage and improve the oil-water separation efficiency. These results can play a guiding role in the design of the vane-type hydrocyclone.