热表面上粉尘层阴燃的研究  

Smoldering Combustion of Dust Layer on Hot Surface

作　　者：钟圣俊[1] 周乐刚 王健[2] 

机构地区：[1]东北大学材料与冶金学院,沈阳110819 [2]沈阳计量测试院,沈阳110179

出　　处：《燃烧科学与技术》2014年第3期199-207,共9页Journal of Combustion Science and Technology

基　　金：国家自然科学基金资助项目(51174047)

摘　　要：采用自主开发的实验装置,以石松子粉尘为实验样品进行了热表面上的粉尘层阴燃实验,研究了自然对流环境下粉尘阴燃过程机理及粉尘厚度对阴燃过程的影响.实验结果表明,粉尘厚度对阴燃的起始时间和持续时间有影响,粉尘层越厚,阴燃起始时间越长且其持续时间也越长.采用简化的三步反应动力学机理,应用可燃固体颗粒通用热解模型计算软件Gpyro对热表面上的粉尘阴燃进行了二维数值模拟研究.模拟结果与实验结果符合较好,模拟结果较好地反映了粉尘阴燃的发展过程,粉尘升温过程和阴燃传播过程均在模拟结果中得到较好体现.Experiments on smoldering propagation in lycopodium dust layer on a hot surface with constant temperature was carried out, aiming to explore the mechanism of dust smoldering process and the impact of the thickness of dust layer on it. Experiments show that the thickness of dust layer has effect on the initiation and duration of smoldering, i. e, the thicker the dust layer is, the longer the initiation and duration time of smoldering will be. Based on a reduced three-step reaction mechanism, a generalized pyrolysis model for combustible solids （Gpyro）is applied to simulate the 2 D smoldering propagation of lycopodium dust layer on a hot surface. The computation results agree well with the measurement and the evolution of dust smoldering is well predicted in simulation. Favorable agreement of temperature histories, time and location of smoldering initiation and smoldering propagation velocity between simulation results and experimental data is demonstrated.

关 键 词：阴燃 数值模拟 有机粉尘 石松子粉 

分 类 号：X932[环境科学与工程—安全科学]