Abstract
The high-temperature effect gas SF6 is used in the power industry, and its emissions are increasing daily. Therefore, the degradation of SF6 is particularly important. In this work, SF6 with a high concentration of 2% was degraded using the catalytic principle of TiO2 under UV light at normal temperature and pressure. Experimental results proved that this method can effectively degrade SF6. Moreover, the addition of TiO2 can effectively increase the degradation rate of SF6. The degradation of eight pieces of TiO2 with a unit area of 3 cm2 was 8.98% after 3 h of catalysis. FTIR spectral analysis showed that the main degradation products were SO2F2, SiF4, SF4, and SO2. Adding H2O can further increase the degradation rate, which can reach 27.22% in 3 h. The main degradation products were SO2F2, SiF4, SF4, SiH4, HF, and SO2. Finally, simulations verified the catalytic decomposition of SF6 on the surface of TiO2.
Highlights
The excellent insulation performance of SF6 can greatly reduce the insulation distance within the gas insulation equipment, thereby minimizing the equipment footprint and saving the infrastructure cost
We studied the effects of different numbers of catalyst TiO2 and of addition of H2O(g) on the degradation of high-concentration SF6 under UV light irradiation at normal temperature and pressure
Under UV light irradiation, only a small fraction of SF6 absorbed the energy of UV, and the degradation rate was only 1.25%
Summary
The excellent insulation performance of SF6 can greatly reduce the insulation distance within the gas insulation equipment, thereby minimizing the equipment footprint and saving the infrastructure cost. Equipment such as GIS/GIL with SF6 as an insulating medium is unaffected by environmental factors due to isolation in the atmosphere, and the operation is safe and reliable. SF6 concentrations in the atmosphere have increased by more than two orders of magnitude due to the extensive use of SF6 gas and unorganized emissions.[1,2,3] The annual emissions of SF6 in the electric power industry worldwide have increased from 0 to 7420 tons in 2008.4 The global warming potential (GWP) of SF6 gas (about 23,500 times that of CO2 gas)[5,6] is chemically stable, and its decomposition is complicated. The total amount of SF6 gas that is illegally emitted every year is equivalent to approximately 125 million tons of CO2 gas, and the accumulation of SF6 gas in the atmosphere is expected to have an inestimable impact on global climate change.[7]
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