Novel electrodes of an electrostatic precipitator for air filtration

Reduction of aerosol particulates through the use of an electrostatic precipitator with guidance-plate-covered collecting electrodes

“…High corona voltage results in high filtration efficiency, which makes sense, because the particles can carry more charges during the ionization processes. In addition, when the charged particles are exerted at higher electric forces (which is proportional to the repelling voltage), they move to and settle down on the collecting electrodes within limited channel lengths (Wen et al, 2014). Therefore, a higher repelling voltage helps the ESP increase the filtration efficiency.…”

“…To improve filtration efficiency by suppressing particle re-entrainment, our research group has presented foam-covered ESPs, where the collecting electrodes are covered with porous foam. Our group has successfully proven that foam-covered ESPs have high ratings in filtration efficiency (Krichtafovitch et al, 2013;Wen et al, 2014). Nevertheless, foam-covered ESPs may not be ideal for very dusty areas, because the foam has limited pores for storing collected particles; highly frequent replacements would be required.…”

The key energy performance of novel electrostatic precipitators

“…In addition, the edges of the repelling electrodes are covered by the foam, which reduces the chance of sparkover between the electrodes and keeps the conductive dust from fast discharging. The experimental results showed that FC-ESP has up to 99% collection efficiency at a volumetric rate of 0.16 m 3 /s [1,2], which is very competitive to HEPA filters and traditional stand-alone ESPs that operate without preand/or post-filters. Fig.…”

“…Disturbances such as passing airflow or vibrations cause the collected particles to return to the environment [19][20][21], thus lowering the collection efficiency. To minimize the effects of particles re-entrainment, our research group has been actively working on the development of ESPs for years and has previously presented two novel particle-trapping mechanisms for ESPs, which are foam-covered ESP (FC-ESP) [1,2] and guidance-platecovered ESP (GPC-ESP) [3].…”

“…Nevertheless, the implementation of pre-and/or post-filters impedes airflow and increases the pressure drop of the system. Our research group previously presented two novel particle-trapping mechanisms that promoted the collection efficiencies of ESPs despite the absence of fibrous filters [1][2][3]. For a foam-covered ESP (FC-ESP), the collecting electrode is covered by porous foam.…”