冲洗水压力对可调控组合旋流器分离性能的影响

The Effect of Flushing Water Pressure on Separation Performance of the Adjustable Combined Cyclone

为实现旋流器高效分级的同时可在线调控,以Cavex旋流器为结构雏形,设计了一种组合旋流器,利用计算流体动力学数值模拟与试验相结合的方法,研究了冲洗水压力对可调控组合旋流器分离性能的影响。利用Fluent软件采用RSM+VOF模型对旋流器内部流场进行了模拟,对比分析了不同冲洗水压力下可调控组合旋流器压力分布和切向速度分布,并通过DPM模型对不同粒度颗粒运动轨迹进行了预测。分级试验研究结果表明,常规旋流器分级粒度调节困难,对于-0.045 mm粒级石英颗粒分级的汉考克综合效率最高为63.80%。可调控组合旋流器随着冲洗水压力的增加底流夹细减少,在冲洗水压力为0.02 MPa时对-0.045 mm粒级石英颗粒分级效率可达79.58%。研究结果证明了组合旋流器在分级效率与可调控两个方面比常规旋流器有明显的优势。

In order to realize the efficient classification and on-line regulation of cyclones,a combined cyclone was designed with Cavex cyclone as the structural prototype.The influence of flushing water pressure on the separation performance of the adjustable combined cyclone was studied by combining computational fluid dynamics numerical simulation with experiment.The RSM+VOF model was used to simulate the internal flow field of the cyclone by Fluent software.The pressure distribution and tangential velocity distribution of the adjustable combined cyclone under different flushing water pressures were compared and analyzed,and the particle trajectories of different particle sizes were predicted by the DPM model.The results of grading test show that it is difficult to adjust the grading particle size of conventional cyclone.The highest comprehensive efficiency of Hancock classification of-0.045 mm quartz particles is 63.80%.The adjustable combined cyclone reduces the bottom flow entrainment as the flushing water pressure increases.When the flushing water pressure is 0.02 MPa,the grading efficiency of-0.045 mm quartz particles can reach 79.58%.The results show that the combined cyclone has obvious advantages over the conventional cyclone in terms of grading efficiency and controllability.