小麦淀粉的燃烧过程和热分析动力学分析  

Combustion process and thermal analysis kinetic analysis of wheat starch

作　　者：吴欣荣 乔建江[2] WU Xin-rong;QIAO Jian-jiang(School of Mechanical and Power Engineering,East China University of Science and Technology,Shanghai 200237,China;Safety Engineering Consulting Center,East China University of Science and Technology,Shanghai 200237,China)

机构地区：[1]华东理工大学机械与动力工程学院,上海200237 [2]华东理工大学安全工程咨询中心,上海200237

出　　处：《化学工程》2023年第4期62-67,共6页Chemical Engineering(China)

摘　　要：为了分析小麦淀粉的燃烧特性,对小麦淀粉进行热重实验,绘制TG-DTG曲线,对其燃烧过程进行划分,计算小麦淀粉燃烧特性参数,比较其燃烧性能。通过等转化率方法进行热分析动力学研究,并分析小麦淀粉粉尘燃烧反应机理。结果表明:小麦淀粉燃烧过程分为脱水阶段、过渡阶段、快速燃烧阶段和焦炭燃烧阶段,质量损失主要发生在快速燃烧阶段,并在这一阶段质量损失速率达到最大值;在高温升速率下,小麦淀粉粉尘的可燃特性指数和综合燃烧特性指数都较高,可燃性能和燃烧性能都提高,易发生燃烧反应;运用Starink、FWO和Kissinger 3种方法得到的平均活化能值分别为94.777,98.892,94.142 kJ/mol,活化能较小,容易发生燃烧化学反应;在较大的加热速率下,小麦淀粉更易发生表面着火,符合表面非均相点火机理。To analyze the combustion characteristics of wheat starch,the thermogravimetric experiment of wheat starch was carried out to plot the TG-DTG curve.The wheat starch burning process was divided.The combustion characteristic parameters of wheat starch was calculated and its combustion performance was compared.Kinetic study of thermal analysis by equal conversion method,and the combustion reaction mechanism of wheat starch dust was analyzed.The results show that the combustion process of wheat starch dust is divided into dehydration stage,transition stage,rapid combustion stage and coke combustion stage.The weight loss mainly occurs in the rapid combustion stage,and the weight loss rate reaches the maximum in this stage;Under the high temperature rising rate,the flammability index and comprehensive combustion characteristic index of wheat starch dust are higher,the flammability and combustion performance are improved,and the combustion reaction is easy to occur.The average activation energy values obtained by Starink,FWO and Kissinger are 94.777,98.892 and 94.142 kJ/mol,respectively.The activation energy is small and combustion chemical reaction is easy to occur.At a higher heating rate,the surface ignition of wheat starch is more likely to occur,which is consistent with the surface heterogeneous ignition mechanism.

关 键 词：小麦淀粉 燃烧特性 热分析动力学 燃烧机理 

分 类 号：X937[环境科学与工程—安全科学]