锅炉烟道飞灰颗粒电除尘捕获特性研究  

Capture Performance of an Electrostatic Precipitator for Fly Ash Particles from Boiler Flue Ducts

作　　者：王为术[1] 王鑫[1] 张春杰[1] 王纪宏 王保文[1] 姚明宇[3] 

机构地区：[1]华北水利水电大学热能工程研究中心,郑州450011 [2]大唐林州热电有限责任公司,河南林州455561 [3]西安热工研究院有限公司,西安710032

出　　处：《动力工程学报》2017年第12期1007-1014,共8页Journal of Chinese Society of Power Engineering

基　　金：国家重点研发计划资助项目(2016YFB0601404)

摘　　要：采用标准k-ε双方程湍流模型对1台连接于锅炉烟道的线板式静电除尘器(ESP)进行三维数值模拟,研究了ESP内烟气流场分布、电晕电场以及飞灰颗粒的荷电特性和运动轨迹,并分析了电场力与湍流作用对烟气流动和飞灰颗粒捕获的影响.结果表明:气流分布板能均化烟气流场,降低电场区入口烟气流速;电场区飞灰颗粒质量浓度沿深度方向逐渐降低,放电极电压的增加使得飞灰颗粒荷电量增加,较强的电场力增强了收尘极板对飞灰颗粒的捕获,提高了收尘效率;在较高的烟气流速下飞灰颗粒所受惯性力增大,克服电场力逃脱收尘极板捕获的能力增强,使得ESP收尘效率降低.Three-dimensional numerical simulation was carried out using standard k-εtwo-equation turbulence model on a wire-plate electrostatic precipitator（ESP）installed in boiler flue duct to study the distribution of flue gas flow field,Corona electric field,particle charging and particle motion track within the ESP;besides,the effect of electric field force and turbulence action on the flue gas flow and the capturing of ash particles were analyzed.Results indicate that the gas flow distribution plates can homogenize the flow field and reduce the gas velocity at the entrance of electric field.The concentration of ash particles reduces gradually along the flow direction;the carrying capacity of ash particles increases with the rise of discharge electrode＇s voltage;stronger electric field force enhances the capturing of ash particles by collection plate,thus improving the dust collection efficiency.When the flue gas velocity increases,the collection efficiency of ESP decreases,due to the enhanced inertia force undertaken by ash particles under higher flue gas velocity,making the particles escape from the electrostatic precipitator more easily by overcoming the electric field force.

关 键 词：静电除尘器 飞灰颗粒 湍流 收尘效率 数值模拟 

分 类 号：TK221[动力工程及工程热物理—动力机械及工程]