有氧条件下硫化铁的生成及自燃性影响因素

The generation and influencing factors of spontaneous combustion of iron sulfide under aerobic condition

油品中的活性硫对设备具有腐蚀作用,探究有氧条件下硫化铁的生成及自燃性影响因素,对预防硫化铁自燃事故的发生具有重要意义。实验以三氧化二铁为主要原料,在氧气浓度为21%的条件下,与硫化氢气体反应来制备硫化铁。考察了环境温度、硫化产物的存放时间和储热条件对硫化铁自燃性的影响。结果表明,有氧条件下硫化铁的生成过程是一个硫化和氧化同时进行的过程,试样温度上升幅度大,单质硫生成量高;环境温度越高,所生成的硫化铁氧化升温越明显;存放时间对硫化铁的自燃性有重要影响,在存放过程中单质硫与Fe S反应生成自燃性更高的多硫化物;储热条件越好,越易造成热量的堆积,加剧硫化铁的氧化放热反应。

The active sulfur in oil has a corrosive effect on the device,exploring the generation and influencing factors of spontaneous combustion of iron sulfide under the aerobic conditions has a great significance to prevent accidents caused by spontaneous combustion of iron sulfide. Experiment takes iron oxide as the main raw material to react with hydrogen sulfide gas under the condition that oxygen concentration is 21% to prepare the iron sulfide and investigates the effects of ambient temperature,storage time and storage conditions for curing hot products on spontaneous combustion of iron sulfide. The results show that the process of generating the iron sulfide under aerobic conditions is a process that oxidation and vulcanization taking place at the same time and when the sample temperature rising amplitude is bigger,generating capacity of elemental sulfur will be higher; The higher the ambient temperature is,the more obvious the resulting iron sulfide oxidation temperature is rising; Storage time has considerable influences to spontaneous combustion of iron sulfide and elemental sulfur reacts with Fe S to form higher spontaneous combustion polysulfide during storage; The better thermal storage condition is,the more easily to lead to the accumulation of heat,which exacerbates the exothermic oxidation of iron sulfide.