Analysis of the quality status of vehicle diesel fuels from 2015 to 2018 in Shanxi Province

The actual quality of vehicle diesel fuels from 2015 to 2018 were investigated, taking the samples of vehicle diesel fuels in Shanxi Province as the object, based on the standards of Automobile Diesel Fuels (GB 19147-2013/2016). The results showed that on the whole, the sample qualification rate in 2015 was the lowest, with a rate of 58.3%, and then increased with an average annual growth rate of 11.7% to 70.8% in 2016 and 82.1% in 2017, while decreased to 81.3% in 2018. The qualification rates of China Ⅳ, Ⅴ and Ⅵ samples were 65.3%, 78.9% and 97.4%, respectively. The main unqualified items were sulfur content and flash point. The average sulfur content of the samples containing sulfur beyond the limits was (671.7±1 061.4)mg/kg, and the average flash point of the samples with lower flash point than the limits was (47.0±9.4)℃. In space, it showed that the qualification rate of “2+26” cities in the middle east were high, while the cities in the west and south were low. In terms of time, there were three types of changes of qualification rate in different cities, i.e. “stable improvement”, “backward and catch-up growth” and “deterioration” types. Finally, it was proposed that a partitioned and graded scheme should be established for the precise quality supervision of automobile diesel fuels in Shanxi Province, and the quality supervision of vehicle diesel fuels should be strengthened.