Dielectric Barrier Discharge on SF6 Degradation Products SO2F2 Free-Pollution Disposal
Li Yalong1, Yang Zhaodi1, Zhang Ying2, Wang Mingwei2, Zhang Xiaoxing1
1. Hubei Engineering Research Center for Safety Monitoring of New Energy and Power Grid Equipment Hubei University of Technology Wuhan 430068 China; 2. Scientific Research Institute of Electric Power Guizhou Power Grid Co. Ltd Guiyang 550002 China
Abstract：Sulfur hexafluoride (SF6), which has strong electronegativity and self-recovery, exhibits excellent insulation and arc-extinguishing capabilities and is widely used in the field of power insulation. However, SF6 is a strong greenhouse effect gas, and its global warming potential is 23 500 times that of CO2, and its degradation can significantly reduce the pollution and harm of SF6 to the atmosphere. Then, there are many kinds of toxic and harmful substances in SF6 degradation products, among which sulfuryl fluoride (SO2F2), as the main decomposition product of SF6, still has the greenhouse effect and huge toxicity and stable nature. The degradation of SO2F2 can improve the harmless degradation process of SF6 and realize the harmless emission of SF6. At present, many scholars at home and abroad for the treatment of SO2F2 waste gas treatment methods mainly include the alkali treatment method, adsorption method, Non-temperature plasma method, etc., in which the Non-temperature plasma method has the advantages of simple structure, ease of control, high efficiency, etc. Still, there is a problem of poor regulation of the product. By filling the catalyst, the degradation rate can be increased and the product selectivity can be improved. In this paper, the degradation of SO2F2 by dielectric barrier discharge (DBD) plasma synergistic filling materials was investigated, and the effects of γ-Al2O3, ZSM-5, and glass beads on the degradation of SO2F2 with different input powers were investigated. The experimental platform for SO2F2 degradation by DBD plasma synergistic filler materials was first constructed. GC-MS was used to quantify SO2F2 and its degradation products, and the SO2F2 degradation rate and product content were calculated and detected. The experiments found that the addition of filling materials can improve the discharge conditions of the system, enhancing discharge voltage and current. Furthermore, the filling materials can effectively improve the SO2F2 degradation rate and energy efficiency (degradation rate: glass beads>γ-Al2O3>ZSM-5>no filler), and also change the decomposition path and product selectivity of SO2F2 to produce SO2 that is easy to handle. 2% SO2F2 at a flow rate of 150 mL/min and a power of 100 W. As the input power increases, the degradation rate of SO2F2 gradually rises, while the energy efficiency shows an overall decreasing trend. With the filling of glass beads, the degradation rate and energy efficiency of SO2F2 were 99.5% and 7.69 g/(kW·h), respectively, and the concentration of SO2 product was 9 278.56×10-4%, under the same experimental conditions, the degradation rate of SO2F2 was lower than that of γ-Al2O3 and glass bead filling when ZSM-5 was filled, but the ZSM-5 filling could make SO2F2 decompose completely and directionally to SO2, at which time the content of SO2 The SO2F2 decomposition products are mainly SO2, SOF2, SOF4 and SiF4, etc. The results of the study show that the SO2F2 degradation rate is lower than that of γ-Al2O3 and γ-Al2O3 filling, but ZSM-5 filling can almost completely directional decomposition of SO2F2 to SO2, at which time the content of SO2 is 16 908×10-4%. The results of the study provide reference solutions for the efficient degradation of SO2F2 and the harmless treatment of SF6. The main decomposition products of SO2F2 include SOF2, SO2, SOF4, and OF2. The addition of a catalyst can alter the decomposition pathway of SO2F2, facilitating the generation of the more manageable SO2. The degradation products also contain a significant amount of SiF4, indicating that etching reactions have occurred.
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