粒径对中密度纤维板粉尘爆炸特性影响实验研究  

Experimental study on the effect of particle size on dust explosion characteristics of medium density fiberboard

作　　者：吴佳梦 庞子政 朱顺兵 段毅 WU Jia-meng;PANG Zi-zheng;ZHU Shun-bing;DUAN Yi(College of Safety Science and Engineering,Nanjing Tech University,Jiangsu Nanjing 211816,China;Jiangsu Key Laboratory of Urban and Industrial Safety,Jiangsu Nanjing 211816,China)

机构地区：[1]南京工业大学安全科学与工程学院,江苏南京211816 [2]江苏省城市与工业安全重点实验室,江苏南京211816

出　　处：《消防科学与技术》2022年第3期296-300,共5页Fire Science and Technology

基　　金：江苏省研究生科研与实践创新计划项目(SJCX21_0448);国家自然科学基金面上项目(51876088)。

摘　　要：为探究粒径对中密度纤维板粉尘爆炸及相关特性的影响,采用20 L爆炸球、粉尘云最低着火温度装置、锥形量热仪和哈特曼管装置,对不同粒径粉尘的爆炸下限、最大爆炸压力、最低着火温度、热释放速率和火焰传播规律进行研究。结果表明,随着粉尘粒径减小,爆炸下限和粉尘云最低着火温度降低,最大爆炸压力逐渐增大;粉尘燃烧过程分为升温、着火、过渡、加剧和熄灭5个阶段,并出现2个峰值,热释放速率变化时间和吸热时间随着粒径减小而增加,热释放速率峰值增大;火焰在管道内的传播随着粒径减小先增强后减弱,管道外“火球”形状更大,火焰消散后火星数量变少,火焰尾端更加细长。In order to explore the effect of particle size on dust explosion and related characteristics of medium density fiberboard,20 L explosion ball,minimum ignition temperature device of dust cloud,cone calorimeter and Hartman tube device were used to study the lower explosion limit concentration,maximum explosion pressure,minimum ignition temperature,heat release rate and flame propagation law of dust with different particle sizes.The results show that with the decrease of dust particle size,the lower explosion limit concentration and minimum ignition temperature decrease,and the maximum explosion pressure increases gradually;The dust combustion process is divided into five stages:temperature rise,ignition,transition,intensification and extinction,and there are two peaks.The change time and heat absorption time of heat release rate increase with the decrease of particle size,and the peak value of heat release rate increases;With the decrease of particle size,the propagation of flame in the pipe first increases and then decreases,the shape of"fireball"outside the pipe is larger,the number of sparks decreases after the flame dissipates,and the tail end of the flame is more slender.

关 键 词：中密度纤维板 粉尘爆炸 热释放速率 火焰传播 

分 类 号：X932[环境科学与工程—安全科学] O643.221[理学—物理化学]