硫铁化物自燃性的研究

Research on Pyrophoricity of Iron Sulphides

储罐内壁铁的腐蚀产物之一Fe2O3与湿H2S发生反应生成不同形式的硫铁化物,硫铁化物的氧化放热是引起含硫油品储罐着火的主要原因。研究了在75℃条件下,硫化时间对Fe2O3硫化产物的生成及其自燃性的影响。通过X-射线衍射对硫化时间为6h、3d、6d以及17d条件下生成的硫铁化物成分进行了鉴定,并对3d和6d条件下的硫铁化物进行了定量分析。结果表明,在高温条件下,随着硫化时间的延长,有更多的FeS2和Fe3S4生成,并且Fe3S4不断向FeS2转化,自燃性增强,对储罐安全运行构成威胁。

Iron sulphides are generated when Fe203 as a predominant corrosion product in oil storage tanks react with H2 S. Thermal oxidation of the iron sulphides is regarded as the main cause of tank fire. The influence of sulfuration time on forming of sulflurization product of Fe2O3 and on pyrophoricity of iron sulphides are analytically examined. The component sulfurization product at 6 h, 3 d, 6 d and 17 d are identified by X-ray diffraction. The iron sulphides at 3 d and 6 d are quantitative analyzed. The research results indicate that with the growth of curing time the FeS2 and Fe3Snare generated, and Fe3S4 contined to transform FeS2. The pyrophoricity is stronger which poses a threat to the safe operation of the tank.