109 / 2021-06-09 10:13:19

Simulation Study on the Decomposition of SF6 by Thermal Plasma

SF₆ is a strong greenhouse gas, which has the global warming potential value of 23 900, and its atmospheric lifetime is more than 3 000 years. To decompose retired SF₆, using thermal plasma method is worth trying. In this paper, a simplified reaction kinetic model was used to simulate the decomposition of SF₆ by thermal plasma. The effects of different parameters on the decomposition process of SF₆ were mainly discussed, and the yield of HF and the capture rate of F atoms were defined to better compare the decomposition effects under different conditions. The results indicate that H₂ is a great auxiliary gas and higher reaction temperature is beneficial to the decomposition of SF₆. When moderate H₂ is added into the system, and the reaction temperature reaches about 5000K, the decomposition of SF₆ will be most sufficient. These results give some predictions for the final products and can provide some guidance for the subsequent experimental work of using thermal plasma to decompose SF₆.