Abstract:At present, the environmentally friendly insulating medium C₆F₁₂O has been applied in the gas switch cabinet. Selecting suitable porous materials to adsorb the decomposition products of C₆F₁₂O mixtures can not only ensure the stable operation of the switch cabinet, but also provide the safety protection for the promotion of C₆F₁₂O environmental protection gas switch cabinet applications. In this paper, the adsorption performance of the ZSM-5 molecular sieve on the thermal decomposition products of C₆F₁₂O/CO₂ mixtures and the effect on the concentration of C₆F₁₂O and CO₂ were investigated by adsorption experiments. At the same time, the adsorption process was simulated based on the molecular dynamic simulation, and kinetic parameters such as the concentration distribution function, the radial distribution function, and the diffusion coefficient were calculated to clarify the adsorption mechanism. The experimental results showed that the main decomposition products of the the C₆F₁₂O/CO₂ mixtures are C₂F₆, C₃F₈, C₄F₁₀, C₃F₆, C₃F₇H, C₅F₁₂ and C₆F₁₄ under the overheating fault. The ZSM-5 molecular sieve has adsorption effect on most decomposition products except C₅F₁₂ and C₆F₁₄. It has excellent adsorption performance for C₃F₈, C₄F₁₀, and C₃F₇H, and the adsorption rate is over 80%. It has a certain adsorption capacity for C₂F₆ and C₃F₆, but the adsorption effect is not obvious. Before the experiment, the main insulating medium C₆F₁₂O and CO₂ have higher concentrations, the ZSM-5 molecular sieve has little effect on its concentration. The adsorption rate after the experiment is 1.77% and 0.25% respectively after the experiment. The simulation results showed that the ZSM-5 molecular sieve can well adsorb gas molecules (C₂F₆, C₃F₈, C₄F₁₀, C₃F₆, C₃F₇H) with kinetic diameters equivalent to its own pore size. The adsorption effect of gas molecules (CO₂, CF₄, C₅F₁₂, C₆F₁₂O, C₆F₁₄) with too small or too large molecular volumes is not obvious. In conclusion, the ZSM-5 molecular sieve can be used for the adsorption and treatment of decomposition products in C₆F₁₂O gas switch cabinets, to ensure the safe and stable operation of the equipment. It also provides a reference for the selection of filter materials in related power protection equipment.