线管式稀土钨阴极ESP除尘特性数值模拟  

Numerical Simulation of Particles Collection Characteristics in a Wire-tube Rare Earth Tungsten Cathode Electrostatic Precipitator

作　　者：徐瑞甫 蔡杰[1] 刘雨寒 顾中铸[1] XU Rui-fu;CAI Jie;LIU Yu-han;GU Zhong-zhu(School of Energy and Mechanical Engineering,Nanjing Normal University)

机构地区：[1]南京师范大学能源与机械工程学院

出　　处：《建筑热能通风空调》2020年第10期30-34,共5页Building Energy & Environment

基　　金：国家自然科学基金项目(No.51878356)。

摘　　要：以线管式稀土钨阴极高温静电除尘器为研究对象,基于计算流体力学和直接模拟蒙特卡洛(Direct simulation of Monte Carlo,DSMC)方法的数学模型,建立高压电场条件下静电除尘器内部气、电、固多相流场模型,分析了高温静电除尘器的除尘特性,为除尘工艺参数优化提供了理论依据。将针对稀土钨阴极材料的含有温度项的电流密度经验公式引入到电场模型中,从而简化了颗粒在温度场下的受力情况。通过与实验结果的对比,验证了该模型的准确性。模拟结果表明降低气流速度,提高荷电电压都能使除尘效率显著提高。粉尘粒径越大最容易去除,提高温度可以改善线管式除尘性能。A multi-phase flow model of gas,electricity and solids in the electrostatic precipitator under the condition of high-voltage electric field is established by the Computational Fluid Dynamics(CFD)and a direct simulation of Monte Carlo(DSMC)method mathematical model for the wire-cylinder rare earth tungsten cathode high-temperature electrostatic precipitator.The dust collection efficiency of the high-temperature electrostatic precipitator are systematically analyzed to provide a theoretical basis for the optimization of the dust removal process parameters.By introducing the current density empirical formula containing the temperature term into the electric field model for rare earth tungsten cathode,the stress of the particles under the temperature field is simplified.The results calculated by numerical simulation are compared with the experimental data to verify the accuracy of the model.The results show that the lower airflow speed,higher voltage and larger particle size can improve the dust removal efficiency and the higher temperature can improve the performance of line pipe dust removal.

关 键 词：静电除尘器 颗粒运动 除尘效率 数值模拟 线管式 稀土钨 

分 类 号：TU834.6[建筑科学—供热、供燃气、通风及空调工程]