多场作用下电除尘器内电动流体运动特性分析  

Study of Electrofluid Motion Characteristics Under the Multi-field in Electrostatic Precipitator

作　　者：邓杰文[1] 李少华[1] DENG Jiewen;LI Shaohua(School of Energy Power and Mechanical Engineering, North China Electric Power University, Changping District, Beijing 102206, China)

机构地区：[1]华北电力大学能源动力与机械工程学院

出　　处：《中国电机工程学报》2018年第8期2358-2366,共9页Proceedings of the CSEE

摘　　要：为了描述不同阳极板结构的电除尘器内发生电晕时带电颗粒的运动过程,建立了电晕放电条件下的荷电颗粒多物理场作用的数学模型,通过针板放电形成电晕风的实验结果验证了数学模型的合理性,讨论了多场耦合作用下阳极板结构对烟气流动特性和粉尘颗粒的运动行为的影响,分析结果表明：线板式电除尘内电晕放电时,电晕极附近会形成气流漩涡,当主流烟气存在一定速度后,气流漩涡现象消失,出口横截面的速度分布存在明显差异,其中c型极板对应的出口横截面速度分布差异最为明显;c型阳极板附近容易集聚大量低速荷电颗粒,相对其他两种板的粉尘脱除效率更高。The mathematic model of the multi-physics field of the charged particles under the corona discharge condition was established to investigate the motion of charged particles in the electrostatic precipitator with different anode plate structures. The rationality of the model was verified by the experimental results of corona winds formed by needle plate discharge. Subsequently, the influence of the anode plate structure on the flue gas flow characteristics and the motion of the dust particles under the multi-field coupling effect were both discussed. The result shows that the airflow vortex is formed near the corona electrodes while the corona discharge occurs in the line plate electrostatic precipitator. Whereas, the airflow vortex disappears as the main flue gas obtain a certain speed, meanwhile the velocity distribution of the outlet cross section is obviously different, wherein the velocity distribution difference of c-type plate is especially obvious. Compared with other two plates, the c-type anode plate is easier to gather low-speed charged particles, and the dust removal efficiency is higher.

关 键 词：电流体力学 多物理场 静电除尘器 电晕放电 颗粒轨迹 

分 类 号：TK284[动力工程及工程热物理—动力机械及工程]