Effect of Particle Size on Degradation of SF6 by Dielectric Barrier Discharge
Zhang Xiaoxing1, Zhou Chang1, Cui Zhaolun2, Zhang Guozhi1, Wu Yunjian1
1. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of Technology Wuhan 430068 China; 2. School of Electrical Power South China University of Technology Guangzhou 510640 China
Abstract：Sulfur hexafluoride (SF6) is a widely used insulating gas, but its strong greenhouse effect can cause great potential harm to the atmospheric environment. Degradation of SF6 by dielectric barrier discharge (DBD) based on packed-bed reactor is a promising treatment, but the influence of many parameters such as the size of packed medium is still unknown. In this paper, the effects of γ-Al2O3 particles with diameters of 1mm, 2mm and 4mm on the degradation of SF6 were investigated based on packed-bed type DBD. It is found that the small size of the particles will reduce the air gap space in the reaction area, so that the DBD discharge system tends to produce filamentous discharge, the degradation rate and energy efficiency of 2mm packing system are better than those of 1mm and 4mm systems, which may be attributed to the fact that the 2mm packed particles take into account the important factors of larger active contact area and longer gas residence time. Compared with 2mm and 4mm systems, the 1mm system can promote SO2 gas production and inhibit SO2F2, SOF2 and SOF4 production. The experimental results provide theoretical support and technical guidance for the industrial harmless degradation of SF6.
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2022, Vol. 37 
