电晕驻极针刺毡滤袋表面静电势特征及过滤性能

doi:10.12068/j.issn.1005-3026.2023.11.019

摘要/Abstract

摘要： 袋式除尘器用针刺毡滤袋经电晕驻极后其表面初始静电势分布及其衰减特性尚不清晰，从而限制了该技术在工业除尘领域的实际应用.利用自制单针-板电极负直流高压电晕驻极装置对针刺毡滤袋进行电晕驻极处理，将滤袋表面网格化细分为驻极核心区域、中间区域及边缘区域，分别探究不同驻极电压、驻极温度、驻极时间和滤袋材质对各个区域内表面初始静电势及其衰减特性的影响规律.在此基础上，对最优驻极工艺条件下得到的驻极针刺毡滤袋过滤性能进行评估.结果表明:即使对于同一滤袋，不同驻极区域内表面初始静电势及其衰减规律随驻极电压、驻极温度及驻极时间的变化规律也各不相同.当滤袋表面电荷密度达到饱和状态时，进一步升高驻极电压反而会降低其核心区域内表面初始静电势；驻极时间主要影响核心区域内表面初始静电势，对于非核心区域内初始表面静电势几乎没有影响；提升驻极温度可显著提高非核心区域内表面初始静电势；表面初始静电势越小、驻极温度越低、驻极时间越长均能有效降低电晕驻极针刺毡滤袋表面静电势衰减速度.电晕驻极处理使得针刺毡滤袋对于0.3及0.5μm颗粒物捕集效率提升显著，提升幅度高达28.79%及18.14%，同时其压差几乎保持不变.

关键词: 滤袋；电晕驻极；表面静电势；过滤特性

Abstract: The application of needle felt bag filters charged by corona electret in the industrial filed is limited due to the unclear surface electrostatic potential distribution and potential decay mechanisms. The bag filters were charged by self-made single needle corona discharge device with negative direct-current high voltage power to investigate the effect of voltage， temperature， time and material type on the surface electrostatic potential distribution and potential decay characteristics in the core area， middle area and edge area， respectively. Subsequently， the filtration performance of the electret bag filter was evaluated under the optimal electret process conditions. The results indicated that the variation of the initial surface electrostatic potential and potential decay characteristics in different electret regions with voltage， temperature and time are significantly different， even for the same sample. When the surface charge density of the bag filter reaches the saturation state， the initial surface potential in the core area decreases with the further increase of voltage. The time mainly affects the initial surface potential in the core area， and it has little effect on that in the non-core region. The effect of temperature on the initial surface potential in the non-core area is more obvious. The attenuation rate of surface potential decreases with the lower initial surface potential， the decrease of temperature and the increase of time. The collection efficiency of bag filters for submicron particles can be enhanced by electret treatment but without negatively affecting the pressure drop characteristics， and the increment of collection efficiency for 0.3 and 0.5 μm particles is up to 28.79 % and 18.14 %， respectively.

Key words: bag filter; corona electret; surface electrostatic potential; filtration performance

中图分类号:

TS176
X701.2

吕超，舒瑞，柳静献，孙熙. 电晕驻极针刺毡滤袋表面静电势特征及过滤性能[J]. 东北大学学报（自然科学版）, 2023, 44(11): 1655-1662.

LYU Chao， SHU Rui， LIU Jing-xian， SUN Xi. Surface Electrostatic Potential Characteristics and Filtration Performance of Needle Felt Bag Filters Charged by Corona Electret[J]. Journal of Northeastern University(Natural Science), 2023, 44(11): 1655-1662.

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