静电式油雾净化器的数值模拟与结构优化

Numerical Simulation and Structure Optimization of Electrostatic Precipitator

为满足油雾净化设备技术提升的迫切需求,运用COMSOL Multiphysics软件进行多物理场耦合数值仿真和实验验证,以实现油雾净化设备的结构优化。结果表明:油滴雾粒的去除效率随极板上电压的增高呈现递增关系,直至效率接近于1;电场风速增大使油滴在通道内的停留时间减少,向极板的偏移量减小,在风速超过3.5m/s时,效率急速下降;油滴的分级去除效率随着其粒径的增加而增大,且较小粒径的油滴因其曳力占总受力的比例大而受风速的影响更加明显;经结构优化后的设备效率提高12.6%,体积减小21%,且经实验验证数值模拟具有准确性和可靠性,可为产品优化提供理论依据。

In order to meet the urgent need of technical improvement of oil mist purifying equipment,the multi-physical field numerical simulation and experiment validation were carried out by using COMSOL Multiphysics software to realize structure optimization of purifying equipment.The simulation results showed that the removal efficiency of the oil mist was almost linearly increasing with the increase of the voltage on the collection plate until the efficiency was close to 1.The increase of inlet velocity decreased the stay time of the oil mist in the aisle,and decreased the deviation to the plate.The efficiency declined rapidly when the airflow velocity exceeded 3.5 m/s.The classification efficiency of oil mist increased with the larger particle size,and the oil mist with smaller diameter were more obviously effected by inlet velocity due to the large proportion of drag force.After structural optimization,equipment efficiency was increased by 12.6%and volume was decreased by 21%.Experimental results show that the numerical simulation results are reliable and can provide theoretical basis for optimization of product structure.