基于CFD的旋风分离器陶瓷颗粒与气体分离性能数值模拟

Numerical Simulation of Separation Performance of Ceramic Particles and Gases in the Cyclone Separator Based on CFD

针对陶瓷墙地砖制粉对颗粒物性参数多样性要求,造成陶瓷颗粒与气体在旋风分离器分离过程中流场的复杂性明显,而实验法各种缺陷无法满足测试需求等问题,基于CFD方法构建气固两相分离过程的数学模型,采用数值模拟方式对气固两相流流动特性及分离性能进行了研究,并通过雷诺应力模型(RSM)和随机轨道模型(DPM)对旋风分离器内速度分布、压力分布及陶瓷颗粒运动轨迹进行了重点分析。结果表明:该结构旋风分离器存在对分离性能有较大影响的“短路流”与二次涡流;当气流速度为20 m·s^(-1)、颗粒流量为0.01 kg·s^(-1)、颗粒粒径为0.001~0.8 mm时,该旋风分离器的分离效率为85.7%,分离效率偏低。

In view of the problem that the experimental method with various defects cannot meet the test requirements due to the diversity requirements of particle parameters in ceramic wall and floor tile milling,the obvious complexity of flow field between ceramic particles and gas in cyclone separator,a mathematical model of the gas-solid two-phase separation process was constructed based on the CFD method,and its flow characteristics and separation performance were studied by numerical simulation.The velocity distribution,pressure distribution and particle trajectory in the cyclone separator were analyzed intensively by using Reynolds stress model(RSM)and random orbit model(DPM).The results showed that there were"short-circuit flow"and secondary eddy current which have great influence on the separation performance in the cyclone separator;The separation efficiency of the cyclone separator was 85.7%,which was low,when the airflow velocity was 20 m·s-1,the particle flow rate was 0.01 kg·s-1,and the particle size was 0.001~0.8 mm.