Improvement in discharge characteristics and energy yield of ozone generation via configuration optimization of a coaxial dielectric barrier discharge reactor

doi:10.1016/j.cjche.2022.11.016

Abstract

Abstract: Dielectric barrier discharge (DBD) has been widely employed in ozone generation. However, the technology still exhibits relatively low energy yield (E_Y) referring to its theoretical value. In this work, E_Y of ozone generation was improved by optimizing the mesh number, electrode length, and dielectric material in a coaxial DBD reactor with two wire mesh electrodes. Meanwhile, the discharge characteristics were investigated to elucidate the effect of reactor configuration on E_Y. Results showed that the discharge characteristics were improved by increasing the mesh number, electrode length, and relative permittivity. When the mesh number was increased from 40 to 100, an improvement of approximately 48% in E_Y was obtained. Additionally, higher E_Y values were obtained using corundum as the dielectric material relative to polytetrafluoroethylene and quartz. Ultimately, E_Y in the optimal DBD reactor could reach 326.77 g·(kW·h)^-1. Compared with the reported DBD reactor, the coaxial DBD reactor with the mesh electrode and the dielectric material of corundum could effectively improve E_Y, which lays a foundation for the design of high-efficiency coaxial DBD reactor.

Key words: Coaxial DBD reactor, Configuration optimization, Ozone generation, Discharge characteristics, Energy yield

摘要： Dielectric barrier discharge (DBD) has been widely employed in ozone generation. However, the technology still exhibits relatively low energy yield (E_Y) referring to its theoretical value. In this work, E_Y of ozone generation was improved by optimizing the mesh number, electrode length, and dielectric material in a coaxial DBD reactor with two wire mesh electrodes. Meanwhile, the discharge characteristics were investigated to elucidate the effect of reactor configuration on E_Y. Results showed that the discharge characteristics were improved by increasing the mesh number, electrode length, and relative permittivity. When the mesh number was increased from 40 to 100, an improvement of approximately 48% in E_Y was obtained. Additionally, higher E_Y values were obtained using corundum as the dielectric material relative to polytetrafluoroethylene and quartz. Ultimately, E_Y in the optimal DBD reactor could reach 326.77 g·(kW·h)^-1. Compared with the reported DBD reactor, the coaxial DBD reactor with the mesh electrode and the dielectric material of corundum could effectively improve E_Y, which lays a foundation for the design of high-efficiency coaxial DBD reactor.

关键词: Coaxial DBD reactor, Configuration optimization, Ozone generation, Discharge characteristics, Energy yield

Chuang Liang, Zhihao Liu, Baochang Sun, Haikui Zou, Guangwen Chu. Improvement in discharge characteristics and energy yield of ozone generation via configuration optimization of a coaxial dielectric barrier discharge reactor[J]. Chinese Journal of Chemical Engineering, 2023, 60(8): 61-68.

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