Abstract
ABSTRACT 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
Highlights
Particulate matter (PM), occurring mainly from power plants and industrial processes, has become the dominant pollutant in most major cities of China (Ni et al, 2018; Yao et al, 2009)
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 collection efficiency of a laboratoryscale apparatus generating a reversed electric field to enhance the removal of filtration-charged particles was determined for different configurations
Summary
Particulate matter (PM), occurring mainly from power plants and industrial processes, has become the dominant pollutant in most major cities of China (Ni et al, 2018; Yao et al, 2009). Regardless of whether the wire electrode is located in dusty or clean gas, the main function of the collection stage can be maintained at high potential; accelerated charged particles are deposited on the surface of the bag. The experimental setup was composed of a conventional wire-tube particle precharger and fibrous filters in a reversed electric field. The collection efficiency of filtration-charged particles in the reversed electric field was measured at four filter face velocities, namely 1.0, 1.5, 2.0, and 2.5 m min–1. Total collection efficiency of fibrous filters in a reversed electric field was determined from the measurements of particle concentration in the ith class when the voltages were switched ON. 3) Filtration-charged particles in reversed electric field: The voltages of both the precharger and collection stage were ON. Three filtration models were tested in the experimental setup: 1) Filtration-uncharged particles: The voltages of both the precharger and collection stage were OFF
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