硫化亚铁氧化自燃倾向性的实验研究

Experimental Investigation on the Spontaneous Combustion Tendency of Ferrous Sulfide

含硫油品储罐腐蚀产物FeS的氧化自燃是引起储罐火灾爆炸事故的主要原因。用同步热分析仪(STA)在30～900℃范围内对FeS进行热重热流分析,从物理吸附和化学反应的角度分析了不同粒径和不同升温速率FeS的自然氧化倾向性,计算了不同升温速率FeS的活化能。结果表明,FeS样品粒径越小,越容易发生氧化自燃反应;升温速率越大,FeS越不容易氧化。同时,不同升温速率条件下的FeS反应机制各不相同。从实验得出的动力学参数看出,FeS的氧化反应较复杂,而非简单的放热反应。

Spontaneous combustion of ferrous sulfide generated in the corrosion product in oil tank is regarded as the main reason of fire and explosion accidents of the storage tank. Simultaneous thermal analyzer（ STA） is applied to analyze the thermal gravimetric and heat flow of FeS spontaneous combustion under the temperature from 30 ℃ to 900 ℃, the spontaneous oxidation tendency of FeS in different grain diameter and heating rate is analyzed from physical adsorption and chemical reaction stage and the activation energy with different heating rate is calculated. Results show that the smaller sample ferrous sul- fide size is, the more vulnerable oxidation reaction is; file greater the heating rate of ferrous sulfide is, the harder spontaneous combustion of ferrous sulfide is. Meanwhile, the reaction mechanisms of FeS spontaneous combustion differ greatly when heating rate changed. Based on kinetic parameters of FeS spontaneous oxidation, the oxidizing reaction of ferrous sulfide is a complex reaction rather than a simple exothermic reaction.