管式电除尘器内部细颗粒流动数值模拟  

Tube Type Electric Precipitator Internal Flow Numerical Simulation of Fine Particles

作　　者：郑建祥[1] 吕辛桐 唐晨[1] 康文瑶[1] 周天鹤[1] 

机构地区：[1]东北电力大学能源与动力工程学院,吉林吉林132012

出　　处：《东北电力大学学报》2016年第4期67-72,共6页Journal of Northeast Electric Power University

摘　　要：为了进一步探究电除尘器内颗粒的流动对除尘效率的重大影响,采用k-ε湍流模型和离散相模型对电除尘器内部颗粒流动进行了多组工况的数值模拟。利用用户自定义函数(UDF)编辑电场荷电方程并建立电场受力模型,简化了模拟流程,并优化了模拟数据。通过流场与电场的耦合计算,研究并分析了不同进出口风速对、颗粒直径以及电压等因素对除尘效率的影响。结果表明:电压和粒径恒定时,随着进口风速增加,颗粒滞留时间减少,荷电量不足,颗粒偏移运动越加不明显,除尘效率降低。当电压和进口风速恒定时,由于粒径的平方与颗粒荷电量成正比,所以粒径越大,颗粒荷电量越大,除尘效率变化越高。在进口风速与粒径恒定时,荷电量与电晕电压成正比,电压越大,荷电量越大颗粒受电场力而向收尘壁运动越明显,从而收尘除尘效率明显增加。In order to further explore the influence of particle flow on the dust removal efficiency,the numerical simulation of the internal particle flow in electrostatic precipitator is carried out by using the turbulent model and discrete phase model. By using the user defined function（ UDF） to edit the electric field charge equation and to establish the force model of the electric field,the simulation process is simplified,and the simulation data is optimized. Through the coupling calculation of the flow field and the electric field,the influence of different inlet and outlet velocity,particle diameter and voltage on the dust removal efficiency is studied and analyzed. The results show that when the voltage and the particle size fixed,increase of inlet velocity and decrease of the particles residence time lead to insufficient charge. Particle migration movement has become increasingly obvious,and dust removal efficiency is lower than before. Because the square of the particle size is proportional to the charge quantity,so the bigger the particle size is,the bigger the charge quantity is,and the higher the dust removal efficiency is. When the inlet velocity and particle size is constant,the voltage is greater,the greater the charge. Electric force of particles to dust wall motion is more obvious,so dust removal efficiency increased significantly.

关 键 词：除尘效率 颗粒 风速 电压 偏移 

分 类 号：X513[环境科学与工程—环境工程]