Abstract: The spontaneous combustion of iron sulfides in sour oil tanks is thought to be the main reason to cause fire and explosion accidents in oil tanks. Sulfur hydrogen dissolving in water to form hydro-sulfuric acid reacts with iron to give iron sulfides. The gas of sulfur hydrogen was continuously passed through the water, at a flow rate of 300 mL/min for 6 h, in trigonal beaker contained 8 g iron powder to produce the iron sulfide samples at 25, 50 and 75 ℃ respectively. The deposit was filtered and dried. The reaction product was analyzed by chemical and XRD analysis. The results show the iron sulfide in reaction product is FeS. Air passed through the dry and moist reaction product at a flow rate of 300 mL/min respectively. The experimental results show that all the reaction products are of high spontaneous combustion nature. When sulfuration temperature is increased, the sulfuration reaction rate rose and the spontaneous combustion nature of reaction product are also raised.

Key words: Tank, Iron sulfides, Corrosion, Spontaneous combustion nature, Hydro-sulfuric acid

摘要： 油品储罐中硫铁化合物的氧化自燃被认为是引起油品储罐发生火灾和爆炸事故的主要原因。H2S气体溶解在水中生成的氢硫酸与储罐内壁铁发生化学反应是储罐中硫铁化合物生成方式之一。在25，50，75 ℃温度下，将H2S气体连续6 h通入含有8 g铁粉的水中制备硫铁化合物试样，将沉淀物过滤和干燥。化学分析和XRD分析结果表明，硫化产物中的硫铁化合物为FeS。在空气流速为300 mL/min的条件下，分别对干燥和潮湿的硫化产物试样进行再氧化实验。实验结果表明，所有硫化产物均具有很高的自燃性，而且硫化反应速率随硫化温度升高而增加，其自燃性也随之增加。

关键词: 储罐, 硫铁化合物, 腐蚀, 自燃性, 氢硫酸