铁粉硫化产物氧化自燃性研究

Research on oxidation pyrophorisity of iron sulfides formed from iron

模拟含硫油品储罐硫腐蚀铁生成硫铁化物的过程,对生成硫铁化物的氧化自燃性进行研究,考察了铁粉含水量、硫化反应时间及蓄热条件对硫化反应产物自然氧化升温的影响,通过氧化升温速率和最高温度值评价其氧化自燃性。结果表明,硫化反应产物能自然氧化升温,并且在最高氧化升温处极易形成温度平台区;随着硫化反应时间的延长,硫化反应产物初期自然氧化升温速率增加,当硫化反应时间超过6 h后,再延长硫化时间对其初期氧化升温速率影响不大;铁粉试样的含水量对硫化反应产物的自燃性有重要影响,干燥铁粉试样的硫化反应产物自燃性低,铁粉试样中的适量水可以增加硫化反应产物的自燃性;蓄热条件好,反应放出的热量散失少,硫化反应产物的自燃性高。

The study simulated the formation process of iron sulfides on the wall of oil storage tanks containing sulfur and researched the oxidation pyrophorisity of the sulfuration products.The pyrophorisity were evaluated by the oxidation temperature-rising rate,the peak temperature and its retention time for the highest temperature.The results show that temperatures of the sulfuration products can rise when the initial oxidation temperature-rising rate improves with the increase of sulfuration time;The influence becomes little after more than 6 h,but the standing time of the peak temperature is longer;The moisture content of iron samples has significant influence on the sulfuration and pyrophorisity of the products;Pyrophorisity of the iron sulfides produced from dry sample and hydrogen sulfide is low and the products of the sample with moderate moisture content improve the pyrophorisity;With good conditions of the heat storage,the oxidation temperature-rising range increases for less heat loss.