水分对储罐内壁铁锈硫化物自燃性的影响

Effect of Water on Rust Sulfide Pyrophoricity from Inner-face of Tank

通过对含硫油品储罐自燃事故的分析发现,储罐内壁铁锈与活性硫(主要为H2S)反应,生成的硫铁化物的氧化放热是导致自燃的主要原因。对罐内壁腐蚀产物进行了X-射线衍射分析,模拟了储罐中硫铁化物的生成方式,考察了水分对Fe3O4、Fe2O3和Fe(OH)3硫化产物自然氧化倾向性的影响。在75℃环境温度下,干燥的Fe3O4、Fe2O3和Fe(OH)3硫化产物的氧化反应使温度的升高分别为180℃、2℃和2℃,而含有水分的铁的氧化物样品的硫化产物温度分别升高到290℃、115℃和89℃。结果表明,75℃时,水分的存在有利于硫铁化物的氧化升温,这种升温后引起的放热,是诱发储罐自燃的主要原因。

Self - ignition accident by sour oil tank was analyzed, and the major reason was found to be thermal oxida- tion of iron sulfides generated from reaction of rust with hydrogen sulfide. The corrosion product from inner - face of tank was analyzed by X - ray diffraction analysis, the formation of iron sulfides was simulated, and effect of water on iron sulfides pyrophoricity of ferroferric oxide, ferric oxide and ferric hydroxide was investigated. At 75℃ environment, Temperature by oxidation of sulfides from dry samples of ferroferric oxide, ferric oxide and ferric hydroxide was increased 180℃, 2℃ and 2℃ respectively, while temperature was risen to 290℃, 115℃ and 89℃ respectively by samples with moisture. The result showed that water was favorable to temperature rising by iron sulfides oxidation at 75℃, which promoted self - ignition on oil tank.