Surface Electrostatic Potential Characteristics and Filtration Performance of Needle Felt Bag Filters Charged by Corona Electret

doi:10.12068/j.issn.1005-3026.2023.11.019

Abstract

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

CLC Number:

TS176
X701.2

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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