等转化率法在硫化亚铁热动力学研究中的应用  

Application of the isotransformational method to the study of FeS thermokinetic behavior

作　　者：赵晓芬[1] 陈先锋[1,2] 张杰[1] 王威[1] 张建华[1] 

机构地区：[1]武汉理工大学资源与环境工程学院,武汉430070 [2]中国科学技术大学火灾科学国家重点实验室,合肥230027

出　　处：《安全与环境学报》2012年第5期182-185,共4页Journal of Safety and Environment

基　　金：国家自然科学基金项目(51174153);公安部重点研究计划项目(2011ZDYJHBXF020);中央高校基本科研业务费专项(2012-Ⅱ-011);火灾科学国家重点实验室开放课题(HZ2011-KF06)

摘　　要：FeS的氧化放热是引起石油储罐火灾与爆炸事故的主要原因。采用同步热分析仪对FeS的氧化倾向性及其热动力学规律进行研究,主要分析粒径为0.062～0.074mm的FeS在常温至900℃范围内的DSC/TG试验曲线,运用FWO、Kissinger、Friedman等多种等转化率法计算FeS的活化能和指前因子。其中FWO和Kissinger法的计算结果较为接近,可靠度较高。结合Malek法提出的y(α)-α标准曲线,推断出最概然机理函数为f(α)=(1-α)2。这说明FeS的氧化自燃反应符合二级普通化学反应机理。The paper is inclined to study how to use the isotransformational methods to trace the thermokinetic behavior of FeS. As is known, in the process of oil storage and transportation, there has always been hazardous risk for sulfur to result in chemical reaction with iron from the oil tank, leading to large amounts of heat release and reaction with the oxygen in the air. High-energy spontaneous oxidation combustion of ferrous sulfide has thus been regarded as the chief reason leading to fire and explosion of oil storage tanks and/or their transportation. In order to solve the problem, we have introduced and made simultaneous thermal analysis No. 449F3 to explore the oxidation tendency and the thermo-kinetic discipline of ferrous sulfide at the heating rate of 2 K/min, 5 K/min, 10 K/min, 15 K/min. In proceeding with our research, we have conducted a series of tests at the experimental temperature from room temperature to 900℃ with the dry ferrous sulfide samples with particle sizes of 200-240 meshes, masses of 5mg, at the air flowing rate of 30 mL/min. Based on the thermo- gravimetric and differential scanning calorimetric curves, our testing is to see it that the TG and DSC curves should move to higher temperatures with the increase of the heating rates. In the mean time, it is necessary to make the initial temperature, the peak temperature and the final temperature of oxidation reaction keep on rising. What is more, it is essential to properly apply the isoconversional methods, such as Flynn-Wall-Ozawa, Friedman and Kissinger methods, to the practical thermal kinetics analysis of the ferrous sulfur, which should be able to ensure the whole direct calculation of the activation energy ＆ pre-exponential factors highly accurate to avoid errors in selecting the reaction mechanism function. The mean activation energies of the three methods we have worked out are 156.52 kJ/mol, 114.93 kJ/mol, 167.29 kJ/mol respectively. The results of our application of FWO and Kissinger methods with higher correlative coefficients pr

关 键 词：安全工程 热动力学 硫化亚铁 氧化自燃 等转化率法 

分 类 号：X932[环境科学与工程—安全科学]