FeS-FeS_2组合物的热分析动力学  

Thermal Analysis Kinetics of FeS-FeS_2 Compounds

作　　者：阳富强[1] 朱伟方[1] 刘晓霞[1] YANG Fuqiang;ZHU Weifang;LIU Xiaoxia(College of Environment and Resources, Fuzhou University, Fuzhou 350116, China)

机构地区：[1]福州大学环境与资源学院,福建福州350116

出　　处：《石油学报（石油加工）》2017年第6期1167-1175,共9页Acta Petrolei Sinica(Petroleum Processing Section)

基　　金：国家自然科学基金项目(51741402);福建省自然科学基金项目(2016J01224);福建省高校杰出青年科研人才计划项目(83016018)资助

摘　　要：为了揭示储油罐硫腐蚀产物的氧化自燃历程,在30~1000℃的温度区间,升温速率为10、15、20℃/min的实验条件下,采用同步热分析仪表征了储罐硫腐蚀产物主要成分FeS和FeS_2以及FeS-FeS_2组合物的氧化热解特性。对升温速率15℃/min下FeS和FeS_2的TG-DTG-DSC曲线及FeS-FeS_2组合物的TG-DTG曲线进行比较,进一步采用Flynn-Wall-Ozawa(FWO)和Kissinger 2种热分析动力学方法分别求解FeS-FeS_2组合物的表观活化能。结果表明,6种样品的着火温度主要分布在413.82~508.80℃之间;除FeS外,其他样品的TG曲线趋势相似,DTG曲线在500~650℃温度范围内普遍存在2个质量损失峰值。FeS-FeS_2组合物在氧化自燃过程中,FeS和FeS_2并非简单孤立地发生反应,而是FeS和FeS_2相互作用;组合物中FeS_2的质量分数为20%时,平均表观活化能达到最小,FWO法和Kissinger法计算的平均表观活化能分别为172.95和164.56kJ/mol,且其自燃倾向性最大。In order to reveal the oxidation and spontaneous combustion process of the sulfur corrosion products in the oil storage tanks,the thermal decomposition characteristics of FeS and FeS2as well as the FeSFeS2compounds of the main products of sulfur corrosion products in storage tanks were characterized by a synchronous thermal analyzer under the experimental conditions of temperature from30℃to1000℃and at heating rates of10,15and20℃/min.The TGDTGDSC curves of FeS and FeS2and the TGDTG curves of FeS-FeS2compounds were compared at the heating rate of15℃/min.Furthermore,the apparent activation energies of the FeSFeS2compounds were determined by the FlynnWallOzawa(FWO)method and the Kissinger method of thermal analysis kinetics,respectively.The results showed that the ignition temperature of the six samples was mainly in the range of41382-50880℃.Except the FeS,the TG curves of the other samples are similar.The DTG curves have two mass loss peaks in the temperature range of500-650℃.In the process of oxidation and spontaneous combustion of FeS-FeS2compounds,FeS and FeS2didn〖DK〗’t react in an isolated way,but interact with each other.When the mass fraction of FeS2was20%,the average apparent activation energy was the lowest,and the average apparent activation energies calculated by FWO and Kissinger were17295and16456kJ/mol,respectively;consequently,it is the most liable to spontaneous combustion.

关 键 词：硫腐蚀产物 FeS-FeS2组合物 相互作用 表观活化能 

分 类 号：X925[环境科学与工程—安全科学]