玉米淀粉粒径对其粉尘云着火特性的影响  

Effects of particle size on ignition characteristics of corn starch dust cloud

作　　者：谢恬[1] 陈先锋[1] 张洪铭[1] 黄楚原 唐文文[1] 周洪文[1] XIE Tian;CHEN Xianfeng;ZHANG Hongming;HUANG Chuyuan;TANG Wenwen;ZHOU Hongwen(School of Resources and Environmental Engineering, Wuhan University of Technology, Wuhan Hubei 430070, Chin)

机构地区：[1]武汉理工大学资源与环境工程学院

出　　处：《中国安全科学学报》2018年第4期53-58,共6页China Safety Science Journal

基　　金：国家重点研发计划项目(2017YFC0804705);国家自然科学基金资助(51374164,51774221)

摘　　要：为深入研究玉米淀粉粉尘的着火机制和燃烧行为,分别采用同步热分析仪和粉尘云着火传播试验平台试验研究5种不同粒径的玉米淀粉粉尘云着火特性,观察粒径对粉尘云着火特征温度、着火特征指数和着火延迟时间等参数的影响。试验结果表明：随着粉尘粒径的减小,玉米淀粉的着火特征温度值均有所减小,着火特性指数越大,小粒径范围的玉米淀粉粉尘云更容易着火点燃;着火延迟时间与玉米淀粉粒径间存在显著的二次函数关系,粉尘粒径越小,玉米淀粉粉尘云着火所需时间越短。In order to study the ignition mechanism and combustion behavior of corn starch dust,experiments were carried out on corn starch dust by using a synchronous thermal analyzer and a high-speed photography system. The ignition characteristics temperature,ignition characteristic index and ignition delay time of corn starch under different particle size conditions were obtained and the effects of particle size on the ignition characteristics of corn starch dust cloud were analyzed. The results show that with the decrease in the dust particle size,the ignition characteristic temperatures of corn starch decreases,while the ignition index increases,and the corn starch dust cloud in the range of small particle size can ignite easily,that there is a significant quadratic function relationship between the ignition delay time and the particle size,and that the smaller the particle size is,the shorter the ignition time of the corn starch cloud will be.

关 键 词：玉米淀粉 着火特性 粒径 着火延迟时间 着火温度 

分 类 号：X932[环境科学与工程—安全科学]