摘要
使Fe2O3和Fe(OH)3分别与元素S在不同条件下进行硫化反应,并采用X射线衍射仪鉴定硫化产物组成,在95℃恒温水浴中对硫化产物进行氧化反应,考察了硫化温度和硫化时间对硫化产物自然氧化性的影响。结果表明,元素S高温硫化产物主要是FeS2。硫化产物FeS2具有较高的自然氧化性,随着硫化温度升高,硫化时间延长,硫化产物的自然氧化性增大,更容易发生氧化放热反应,造成油品火灾和爆炸事故。元素S与Fe2O3硫化温度在360℃以上,与Fe(OH)3硫化温度在300℃以上时,其硫化产物FeS2具有较高的自然氧化性。硫化时间在24h以上时,Fe2O3、Fe(OH)3的硫化产物自然氧化性较大。
The paper is concerned about its authors＇ study on the high temperature erosion of element sulfur. As is known, under high temperatures, element sulfur would react with Fe2O3 and Fe（OH）3 respectively. Sulfidized products can be found and analyzed by means of XRD with the oxidation of sulfldized products conducted in a water bath at a temperature of 95 ℃ . X-ray diffraction analyses reveal that the main product of high temperature erosion of element sulfur is FeS2, whose product FeS2 proves to be naturally oxidized. From the temperature-rising and oxygen-consumption curves during the sample oxidation, the affecting factors on the natural oxidation were studied and found including the influences of sulfidation temperature and sulfidation time. The results of our experiments show that the higher sulfidation temperature, and the longer the sulfidation time, the stronger the tendency of natural oxidation is. And, in turn, it would be more likely to cause fire and explosion. During the oxidation of sulfidized products resulted from Fe2O3 and sulfur at 340 ℃ , 360 ℃ , 400 ℃ and 440℃ respectively, the average rates of temperature-rising prove to be 0.62 ℃, 3.2 ℃, 7.8 ℃, and 10.3 ℃ per minute in order And the average rates of oxygen-eonsumtion are O. 12, 0.57, 1.32 and 1.63 percentage of oxygen per minute respectively. In addition, we have found that under the condition of 340 ℃ , Fe2O3 would begin to react with element sulfur for 6 h, 12 h and 24 h, respectively with average temperature-rising rates being 0.62 ℃ , 1.59 ℃ and 12.5 ℃ per minute in order, As to the oxygen-consumption, the average rates are 0.12%/min, 0.30%/mln and 1.96%/min of oxygen respectively. In the process, oxidation of sulfidation products would be formed by Fe（OH）3 and element sulfur at 280 ℃ , 300 ℃ and 340 ℃ respectively, with the average rates of temperature-rising being 9.7 ℃ , 13.7 ℃ and 20.8 ℃ per minute in order. Under the condition of 240 ℃ , Fe（OH）3 would react with element sulfur for 6
出处
《安全与环境学报》
CAS
CSCD
2007年第4期118-121,共4页
Journal of Safety and Environment
基金
国家自然科学基金资助项目(20371024)
关键词
石油化工
元素S
高温硫腐蚀
硫腐蚀产物
氧化性
petrochemical industry
element sulfur
sulfur corrosion at high temperature
sulfue corrosion product
oxidation
