两种实际板型下电除尘器中的电流体动力学流动

发布时间：2018-03-23 23:20

本文选题：电除尘器　切入点：离子风　出处：《高电压技术》2017年02期

【摘要】：为分析电除尘器(ESP)通道中的耦合流动对于荷电粒子捕集的影响,考虑空间电荷密度的作用,模拟了波形板和C型板通道中电风诱导的二次流与主流的耦合效应。基于FLUENT的用户自定义(UDF),采用有限体积法计算电流场并与FLUENT流场耦合,数值模拟了2种实际板型廓线下线-板式电除尘器中的电流体动力学(EHD)流动。模拟结果表明:这2种通道中的电气特性和电流体动力学流动特征有明显差别;波形板通道收尘极表面附近区域的电场强度及分布均优于C型板,即前者近板电场强度相对高且分布更均匀;C型板通道中电风引起的二次流动则强于波形板;当主流速度增大时,波形板通道中的电风效应将逐渐消失,而在C型板中的电风将会加强主流速度,收尘极板附近的涡流区沿流动方向将逐渐变弱。最终得出波形板相对C型板能更有效地抑制粒子返混。
[Abstract]:In order to analyze the effect of coupled flow in ESP channel on charged particle trapping, the effect of space charge density is considered. The coupling effect between the secondary current induced by the electric wind and the mainstream in the waveforms and C-type plate channels is simulated. Based on the user-defined FLUENT, the current field is calculated by the finite volume method and coupled with the FLUENT flow field. The electrohydrodynamic (EHD) flow in two kinds of practical plate profile down-plate electrostatic precipitators is numerically simulated. The simulation results show that there are obvious differences between the electrical characteristics and the electrohydrodynamic flow characteristics of the two channels. The electric field intensity and distribution near the dust collector surface of the corrugated plate channel are better than that of the C-type plate, that is to say, the secondary flow caused by the electric wind in the C-type plate channel is stronger than that in the corrugated plate with a relatively high electric field intensity near the plate and a more uniform distribution. When the mainstream velocity increases, the electric wind effect in the waveform plate channel will gradually disappear, while the electric wind in the C type plate will strengthen the mainstream velocity. The eddy-current region near the dust collector plate will gradually weaken along the flow direction. Finally, it is concluded that the waveform plate can restrain the particle backmixing more effectively than the C-type plate.
【作者单位】：东华大学环境科学与工程学院;上海众材工程检测有限公司;
【基金】：国家自然科学基金(51578121)~~
【分类号】：X701.2

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