Simulation of arc plasma deionization performance in environmentally friendly CF3I–CO2 mixed gas medium

Trifluoroiodomethane (CF3I), recognized for its superior insulating properties and exceptionally low global warming potential, has gained increasing attention as a promising environmentally friendly alternative to sulfur hexafluoride (SF6). To investigate the deionization performance of CF3I/CO2 gas mixtures, this study formulates a set of arc energy balance equations grounded in the arc plasma energy balance theory. Furthermore, a two-dimensional magnetohydrodynamic model of a gas gap arrester arc-extinguishing chamber is developed using the COMSOL Multiphysics finite element simulation software. By analyzing the temporal variations in temperature, pressure, electrical conductivity, and gas flow velocity within the model, the deionization characteristics of different insulating gases under lightning current conditions are comparatively evaluated. The results reveal that, under identical operating conditions, the deionization performance of the 30% CF3I/70% CO2 mixture closely approximates that of SF6. From an environmental perspective, this mixture aligns with the global trend toward low-carbon technologies in the energy sector. In addition, the findings indicate that the 30% CF3I/70% CO2 mixture demonstrates superior deionization capability compared to air, achieving faster extinction of the arc plasma.