Abstract: In order to further study factors influencing spontaneous combustion of oil containing sulfur storage tanks, firstly, four factors including particle size, oil stain, water content and ferric iron compound mass ratio were selected for single-factor experiments to determine the oxidative weight gain rate. And then, based on the orthogonal experiment to verify the influence degree of the interaction between these four factors, the method of range analysis and the method of variance analysis were used to calculate the experimental data. The results show that sulfur corrosion products' particle size, oil stain, water content and mass ratio of ferrous sulfide to ferric sulfide are all important; and the order of importance of single factor influence is the mass ratio, oil stain, particle size and water content, and that the interaction between the mass ratio and oil stain and the interaction between water content and oil stain need to be considered, and the remaining interactions may not be considered.

Key words: sulfur corrosion products, spontaneous combustion, influencing factors, interaction, orthogonal test, oxidation weight gain