Effects of packing particles on the partial discharge behavior and the electrical characterization of oxygen PBRs

Abstract

Packed-bed reactors (PBRs) hold great promise for environmental applications, but a deeper understanding of the behavior of plasma discharge within PBRs is required. To this end, a partial-discharge alternative equivalent circuit for PBRs was established in this work. Dielectric particles (glass beads or glass sand) were used to place focus on the effects of the particle size and shape on the partial discharge behavior of the oxygen PBRs. Some electrical characterizations were explored (e.g. the effective dielectric capacitance, partial discharge coefficient, and corrected burning voltage) that may differ from long-standing interpretations. The findings indicate that the suppressive effect of surface discharge on filament discharge is stronger with the decrease of the particle size. For partial discharge, the effective dielectric capacitance is always less than the dielectric capacitance. The corrected burning voltage and partial discharge tendency increase with the decrease of the particle size. As compared to an empty reactor, the average electric field in the PBR was found to be improved by 3–4 times, and the ozone energy efficiency and production were promoted by more than 20% and 15%, respectively. The plasma processing capacity can therefore be improved by choosing a relatively large size or a complex, irregularly-shaped packing material that is suitable for the discharge gap.

Characteristics of Generic Dielectric Materials and Char as Bed Materials of a Dielectric Barrier Discharge Reactor under High Temperature and Wide Frequency Range

“…Naturally, the selection of bed materials varies as per their respective application. For instance, the removal of carbon particulate matter in diesel exhaust uses MnO X /CeO 2 as a catalyst for the removal of carbon [12]. At the same time, for the particle reduction of CO 2 to CO and O 2 , g-C 3 N 4 , TiO 2 , and/or ZnO are used [24,25].…”

“…On the contrary, the production and processing of CO 2 into CO and O 2 requires AL 2 O 3 , CeO 2 , and glass beads, while ozone production employs primarily TiO 2 combined with other bed materials such as Pyrex beads, Pyrex wool, etc. [12,13,26]. The material combination used is inevitable as the same aids the process and improves the discharge mechanism.…”

“…The available information related to dielectrics once again studies the impact of non-thermal plasma on specific materials such as glass beads, glass sand, ceramics, etc. [12,13]. Alternatively, a combination of plasma discharge and the T i O 2 photocatalyst is investigated to eliminate NO compounds [14].…”