四入口液-液旋流分离器分离性能数值模拟

Numerical Simulation of Four Inlet Liquid-Liquid Cyclone Separation Performance

多入口旋流分离器能在入口速度较低的情况下实现传统旋流器在入口速度较高时才能达到的分离效果,同时具有更加稳定和对称的流场分布。为了进一步验证多入口液-液旋流分离器的分离性能以及溢流分流比和入口流速对其分离性能的影响,基于欧拉-欧拉多相流模型,采用群体平衡方程(population balance model,PBM)对四入口液-液旋流分离器分离性能进行了数值模拟。研究结果表明:在入口流速恒定时,旋流器综合分离效率随着分流比的升高呈先上升后下降变化趋势,溢流分流比为0.22时,旋流器综合分离效率达到最高,此时分离效率为95.66%。当溢流分流比为0.22时,随着入口流速的增大,四入口液-液旋流器分离效率呈先上升后下降最后趋于平缓的变化趋势,当流速为10 m/s时,到达油滴剪切破碎临界条件,此时分离效率最高为96.78%。研究结果可为四入口液-液旋流分离器现场应用和适用性提供理论指导。

The multi-inlet cyclone can achieve the separation effect that the traditional cyclone can only achieve when the inlet velocity is high under the condition of low inlet velocity,and has a more stable and symmetrical flow field distribution.The Euler-Euler multiphase flow model and population balance model(PBM)were used to simulate the four-inlet liquid-liquid cyclone to further verify the separation performance of the cyclone,and the effects of inlet velocity and split ratio on the separation performance of the cyclone were studied.The results show that when the inlet velocity is fixed,the comprehensive efficiency increases rapidly at first and then decreases with the increase of the discharge ratio at the overflow port.When the flow diversion ratio of overflow outlet is 0.22,the hydrocyclone comprehensive separation efficiency reaches the highest,and the separation efficiency is 95.66%.When the overflow split ratio is 0.22,with the increase of inlet velocity,the separation efficiency of the four-inlet liquid-liquid cyclone increases first,then decreases and finally becomes gentle.When the flow rate is 10 m/s,the critical condition of oil droplet shear crushing is reached,and the separation efficiency reaches the highest 96.78%.The research results can provide theoretical guidance for the field application and applicability of the four-inlet liquid-liquid cyclone.