油滴聚并破碎行为对水力旋流器分离性能的影响

Effect of Oil Droplet Coalescence and Breakup Behavior on Separation Performance of Hydrocyclone

为研究离散相油滴聚并破碎行为对旋流器分离性能的影响,以轴入导锥式旋流器为研究对象,将单一的混合模型与加载了群体平衡模型(PBM)的混合模型模拟结果进行对比。模拟结果显示:耦合模型模拟结果可以确定出油滴的破碎位置主要发生在螺旋流道及旋流器的近壁区域,并在轴心油核区油滴粒度分布较大,出现明显的聚并现象;耦合模型得出的分离效率随着入口进液量的提高呈现出先升高后降低的趋势,单一混合模型模拟得出的分离效率随着进液量的增加逐渐升高;两种模拟方法得出的速度场分布几乎无差别,但随着溢流分流比的增大分别呈现出极大值点不同的先升高后降低的趋势。所得结论可为提高水力旋流器数值模拟的准确性提供参考。

To study the effects of coalescence and breakup behavior of discrete phase oil droplet on the internal flow field characteristics and separation performance of oil-water separation hydrocyclone, taking the axial guide cone hydrocyclone as study object, the simulation results of the single Mixture model and the mixed model loaded with the Population Balance Model (PBM) is compared.The numerical simulation results show that, the simulation results of the PBM-Mixture coupling model reveal that the breakup position of the oil droplets mainly occurs in the near-wall region of the spiral flow channel and the hydrocyclone.The oil droplet size is large in the axial oil core region where obvious coalescence phenomenon is observed.The separation efficiency obtained by the coupling model increases first and then decreases with the increase of the inlet liquid volume.While the separation efficiency obtained by the single Mixture model increases with the inlet liquid volume.There is almost no difference in the velocity field distribution by the two simulation methods.But with the increase of the overflow split ratio, the rise and fall trend with different points of local maximum is presented.The study can provide a reference for improving the accuracy of numerical simulation of hydrocyclone.