Abstract Electrostatic precipitator (ESP) is the mainstream technology for controlling emissions of coal-fired thermal power units in China. The barbed electrode (RS or BS) is paired with the electrostatic precipitators. However, such electrodes have serious internal suppression effects and easily cause the current density in some areas to be zero, affecting the electric field distribution. To explore this characteristic, the current density distribution on the surface of the collecting plate was tested on the electrostatic precipitator experimental device, and the suppression effect of the BS barbed electrode and the existence of the “current blind zone” were obtained. The mathematical model of corona discharge was then established to numerically solve the V-I characteristics of the BS barbed electrode's inner and outer discharge tips and quantify the suppression effect between the discharge tips. Finally, to improve the suppression effect and the current density distribution, the BS barbed electrode's structural parameters optimization schemes and supporting circular tubes in the single electrode-plate ESP model were proposed. The results show that the spurs' optimized structure can effectively improve the corona discharge capacity and weaken the suppression effect. At the same time, it was found that when the supporting component is a round tube or flat plate, the shielding effect will be produced. The addition of auxiliary needles on the supporting round tube cannot improve the current density distribution. Additional needles on the supporting plate can eliminate the phenomenon that the current density is zero. The shielding effect of the supporting tube is further explained. The research results provide a theoretical and experimental basis for the optimal design of barbed electrode and ESP's electrode configuration.

中文翻译：

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电除尘器带刺电极的放电特性

摘要 静电除尘器（ESP）是我国燃煤火电机组排放控制的主流技术。带刺电极（RS 或 BS）与静电除尘器配对。但这种电极内部抑制作用严重，容易造成某些区域的电流密度为零，影响电场分布。为探究这一特性，在静电除尘器实验装置上测试了集电板表面的电流密度分布，得到了BS带刺电极的抑制效果和“电流盲区”的存在。然后建立电晕放电数学模型，数值求解BS倒刺电极的VI特性' s 内部和外部放电尖端并量化放电尖端之间的抑制效果。最后，为了提高抑制效果和电流密度分布，提出了单极板ESP模型中BS倒刺电极的结构参数优化方案和支撑圆管。结果表明，经过优化的马刺结构可以有效提高电晕放电容量，减弱抑制效果。同时发现，当支撑部件为圆管或平板时，会产生屏蔽效果。在支撑圆管上增加辅助针不能改善电流密度分布。在支撑板上增加针可以消除电流密度为零的现象。进一步说明支撑管的屏蔽作用。研究结果为带刺电极的优化设计和电除尘器的电极配置提供了理论和实验依据。