Zheng Chenghang, Wang Yifan, Zhang Xuefeng, Yang Zhengda, Liu Shaojun, Guo Yishan, Zhang Yongxin, Wang Yi, Gao Xiang
State Key Lab of Clean Energy Utilization, State Environmental Protection Engineering Center for Coal-Fired Air Pollution Control, Institute for Thermal Power Engineering, Zhejiang University 38 Zheda Road Hangzhou 310027 People's Republic of China
RSC Adv. 2018 Aug 31;8(54):30701-30711. doi: 10.1039/c8ra04765k. eCollection 2018 Aug 30.
Wet electrostatic precipitators (ESPs) demonstrate a robust adaptability for particulate matter control and have been confirmed to be a promising technology for removing particles and sulfuric acid aerosol from flue gas. Recent studies have shown that removing fine particles or sulfuric acid aerosol from wet ESPs requires further development. Among the components of wet ESPs, discharge electrode configurations are crucial for determining the performance of wet ESPs. This paper reports the corona discharge characteristics and removal performance of sulfuric acid aerosol using different discharge electrode configurations in a honeycomb wet ESP experimental system. Two key parameters, namely, - characteristics and current density distribution, with different discharge electrode geometries (, electrode type, spike spacing, and spike length) and rotation angles, were investigated by using a novel electrical parameter measurement system to evaluate the effects of these parameters on corona discharge. The results showed that triple-spike and sawtooth electrodes exhibit the highest average current density. The average current density of the triple-spike electrode increased with the spike length from 10 mm to 20 mm, and the peak current density distribution on the collection electrode increased by 62.1%, but the current density decreased sharply away from the spike. Moreover, the average peak current density decreased by 30.1% when the spike spacing was 25 mm given the sharp point discharge suppression when spikes were significantly dense. The electrode configuration was optimized on the basis of the current density distribution. The highest removal efficiency of sulfuric acid aerosol was 99.2% at a specific collection area of 23.09 m (m s).
湿式静电除尘器（ESPs）在颗粒物控制方面表现出强大的适应性，并且已被证实是一种从烟气中去除颗粒和硫酸气溶胶的有前景的技术。最近的研究表明，从湿式静电除尘器中去除细颗粒或硫酸气溶胶需要进一步改进。在湿式静电除尘器的组件中，放电电极配置对于确定湿式静电除尘器的性能至关重要。本文报道了在蜂窝湿式静电除尘器实验系统中使用不同放电电极配置时硫酸气溶胶的电晕放电特性和去除性能。通过使用一种新型电参数测量系统研究了两个关键参数，即不同放电电极几何形状（电极类型、尖刺间距和尖刺长度）和旋转角度下的电晕特性和电流密度分布，以评估这些参数对电晕放电的影响。结果表明，三尖刺和锯齿形电极表现出最高的平均电流密度。三尖刺电极的平均电流密度随着尖刺长度从10毫米增加到20毫米而增加，集尘电极上的峰值电流密度分布增加了62.1%，但远离尖刺处电流密度急剧下降。此外，当尖刺间距为25毫米时，由于尖刺明显密集时尖端放电受到抑制，平均峰值电流密度下降了30.1%。基于电流密度分布对电极配置进行了优化。在比集尘面积为23.09平方米（每平方米秒）时，硫酸气溶胶的最高去除效率为99.2%。
