堆积铝粉尘遇湿自燃发展规律试验与理论研究  

Experimental and theoretical research on the development law of spontaneous combustion of accumulated aluminum dust when encountered with moisture

作　　者：石永国 贾波 汪圣华 牟杰 Shi Yongguo;Jia Bo;Wang Shenghua;Mu Jie(Zhejiang Academy of Emergency Management Science,Zhejiang Hangzhou 310012,China;Zhejiang Key Laboratory of Safety Engineering and Technology,Zhejiang Hangzhou 310012,China)

机构地区：[1]浙江省应急管理科学研究院,浙江杭州310012 [2]浙江省安全工程与技术研究重点实验室,浙江杭州310012

出　　处：《消防科学与技术》2024年第11期1517-1523,共7页Fire Science and Technology

基　　金：浙江省自然科学基金项目(LTGG24E040001);浙江省“尖兵”“领雁”研发攻关计划资助(2022C03162);浙江省科技重点研发计划项目(2021C03151,2022C03065);浙江省公益技术项目(LGG21G010001)。

摘　　要：利用设计改造的堆积铝粉尘自燃测试装置和粉尘基本参数测试平台,结合理论分析开展不同因素影响下的堆积铝粉尘自燃特征发展规律试验研究。研究表明,随着初始环境温度的升高,堆积铝粉尘的诱导时间缩短,同时着火延滞期时间缩短;随着初始粒径的变大,堆积铝粉尘的延滞期逐渐变长,粉尘自燃的诱导期也随之变长;堆积厚度为2 cm和3 cm的铝粉尘层均发生了自燃,但堆积厚度为1 cm的铝粉尘层未发生自燃,对于最终发生自燃的粉尘,随着堆积厚度的增加,其诱导时间和着火延滞时间均缩短;根据Semenov燃烧理论,进行了临界温度的理论计算估计,并与试验测试值进行对比,其结果较为吻合,证明了试验测试设备的准确性和理论近似计算的可行性。This study mainly utilizes a designed and modified spontaneous combustion testing device for accumulated aluminum dust and a testing platform for basic dust parameters,combined with theoretical analysis to investigate the development patterns of spontaneous combustion characteristics of accumulated aluminum dust under different factors.Research has shown that as the initial ambient temperature increases,the induction time of accumulated aluminum dust decreases,while the ignition delay time decreases;As the initial particle size increases,the delay period of accumulated aluminum dust gradually lengthens,and the induction period of dust spontaneous combustion also basically lengthens;The aluminum powder dust layers with a stacking thickness of 2,3 cm all experienced spontaneous combustion,but the aluminum powder dust layer with a stacking thickness of 1 cm did not undergo spontaneous combustion.For the dust that ultimately underwent spontaneous combustion,the induction time and ignition delay time decreased with the increase of stacking thickness;According to the Semenov combustion theory,a theoretical calculation and estimation of the critical temperature were conducted,and the results were compared with experimental test values.The results were in good agreement,proving the accuracy of the experimental testing equipment and the feasibility of theoretical approximate calculations.

关 键 词：堆积铝粉尘 自燃机理 粉尘自燃 着火延滞时间 

分 类 号：X932[环境科学与工程—安全科学] X928.1