Investigation of the Performance of Filtration-charged Particles in a Reversed Electric Field

Yufeng Chang ； Pei Jia ； Xiaodong Xiang ； Ling Shi ； Xuepeng Jiang

《Aerosol and Air Quality Research》 19卷12期 (2019/12) Pp. 2879-2887

https://doi.org/10.4209/aaqr.2019.06.0283

摘要

Electrical forces can be applied to enhance fabric filters' ability to remove fine particles. To this end, we developed an experimental apparatus consisting of a conventional wire-tube particle precharger and fibrous filters positioned in a generated reversed external electric field. The charging and collection processes were separately accomplished in two stages, and we evaluated the device's ability to filter filtration-charged particles with a diameter of ≤ 2.5 μm. This device exhibited a higher electric field strength, higher collection efficiency, lower pressure drop, and lower electric potential than conventional devices due to the positioning of the wire and grounded electrodes close to the bag and the repulsion of the charged particles by the reversed electric field. When the face velocity was 2.5 m min^(-1), the collection efficiency for the charged particles with the reversed electric field was 8.4% and 64.4% higher than the efficiencies for the charged and uncharged particles, respectively, without the field. The charged particles also displayed a pressure drop when the field was applied that was 10% lower and 5% higher than those of the uncharged and charged particles, respectively, when the field was absent. A negative direct current supply was necessary to direct the deposition of the charged particles, and neither a spark discharge nor a back corona was observed while using the reversed-electric-field apparatus, which, according to our results, enables the removal of filtration-charged particles at face velocities beyond the usual range.

關鍵字

Filtration ； Particle precharger ； Reversed external electric field ； Collection efficiency