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作 者:张立莹 雷洪[1,2] 牛宏 滕行泽 吕璞 ZHANG Liying;LEI Hong;NIU Hong;TENG Xingze;Lü Pu(Key Laboratory of Electromagnetic Processing of Materials,Ministry of Education,Northeastern University,Shenyang 110004,China;School of Metallurgy,Northeastern University,Shenyang 110819,China)
机构地区:[1]东北大学材料电磁过程研究教育部重点实验室,沈阳110004 [2]东北大学冶金学院,沈阳110819
出 处:《高电压技术》2021年第11期4144-4151,共8页High Voltage Engineering
基 金:宝钢集团有限公司联合研究基金(U1460108)。
摘 要:为了深入研究颗粒在静电除尘器内的传输行为,采用开源软件OpenFOAM计算了Maxwell方程组、连续方程、动量方程、颗粒荷电和输运方程,分析线板型静电除尘器内电场、流场和颗粒浓度分布的特点。结果表明,电势、流场和收尘效率的预测值与实验数据符合良好。在线板型静电除尘器内,电势和电荷密度以电晕线为中心呈对称分布,流场和颗粒浓度场以电晕线连线为对称轴基本呈对称分布。静电除尘器的收尘率随板间距的增加而减小,随电晕线间距的增加先增加后减小。当表示电场力与惯性力之比的无量纲准数NEHD和表示惯性力与黏性力之比的雷诺数Re的平方之比N_(EHD)/Re^(2)<1.31×10^(-8)时,静电除尘器内漩涡几乎消失,一次流占主导地位。当NEHD/Re^(2)>3.35×10^(-6)时,静电除尘器内流场出现多个大尺度漩涡,电子风占主导地位。当NEHD/Re^(2)>3.35×10^(-6)或NEHD/Re^(2)<3.35×10^(-8)时,大涡模拟和k-ε湍流模型预测的收尘效率相同;当1.31×10^(-8)<NEHD/Re^(2)<3.35×10^(-6)之间时,大涡模拟和k-ε湍流模型预测的收尘效率存在较大差异。In order to have a deep insight into the particle transport behaviors in a wire-plate electrostatic precipitator,the open source software OpenFOAM is applied to calculate Maxwell’s equations,continuity equation,momentum equation and particle charge/transport equations,and to analyze electric field,flow field and particle concentration distribution in the wire-plate electrostatic precipitator.The numerical results show that the predicted electric potential,air velocity and dust collection efficiency are in good agreement with the experimental data.In the wire-plate electrostatic precipitator,the spatial distributions of the electric potential field and the charge density field are centrosymmetric around the corona wire as the symmetry center.The flow field and the particle concentration field are almost axisymmetric with the connecting line of the corona wires as the symmetry axis.With the increase of distance between two group plates,the dust collection efficiency decreases.And with the increase of distance between to corona wires,the dust collection efficiency first increases and then decrease.If NEHD/Re^(2)<1.31×10^(-8),the vortices almost disappear,and the primary flow dominates the fluid flow.If N_(EHD)/Re^(2)>3.35×10^(-6),some big vortices appear in the electrostatic precipitator,and the electric wind dominates the fluid flow.If NEHD/Re^(2)>3.35×10^(-6) or NEHD/Re^(2)<3.35×10^(-8),the dust collection efficiency in the case of large eddy simulation is similar to that in the case of k-εturbulent model.If 3.35×10−8<NEHD/Re^(2)<3.35×10^(-6),the dust collection efficiency predicted by large eddy simulation is different from that predicted by k-εturbulent model.
分 类 号:X757[环境科学与工程—环境工程]
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