碳酸氢钠粉体粒径对铝粉火焰传播特性的影响  

Effect of sodium bicarbonate particle size on characteristics of aluminum dust flame propagation

作　　者：王玉杰[1] 陈曦[1] 陈先锋[1] 刘晅亚 张英[1] 牛奕[1] 

机构地区：[1]武汉理工大学资源与环境工程学院 [2]建筑消防工程技术公安部重点实验室,天津300381

出　　处：《中国安全科学学报》2016年第3期53-58,共6页China Safety Science Journal

基　　金：国家自然科学基金资助(51174153;51374164);建筑消防工程技术公安部重点实验室开放课题(KFKT2014ZD03);中央高校基本科研业务费专项资金资助(2015-zy-080)

摘　　要：为探索碳酸氢钠粒径的变化对铝粉火焰结构变化和火焰传播特性的影响,采用竖直粉尘燃烧管道实验平台,研究惰化剂质量分数为30%的惰化条件下的火焰传播过程,并记录火焰温度。实验结果表明:碳酸氢钠粉体能显著降低火焰强度,钝化火焰前端;且粉体对铝粉火焰温度的抑制作用与其粒径成反比关系;碳酸氢钠粒径对铝粉火焰传播速度的惰化抑制作用在微米级与其粒径成反比关系,其粒径越小,对铝粉火焰最大传播速度的抑制效果越好。In order to explore the influence of the sodium bicarbonate＇s particle size on the flame structure and flame propagation characteristics of aluminum dust, experiments were performed in a vertical pipe experimental platform. Flame propagation processe and flame temperature characteristic were observed under the inerting condition of 30% mass fraction. Results show that the sodium bicarbonate powder remarkably reduced the flame intensity and passivated the flame front zone; an inverse relationship existed between the inhibition effect of sodium bicarbonate powder on aluminum dust flame temperature and its particle size; and at the micron level, an inverse relation also came into being between the particle size of sodium bicarbonate powder and the effect of inerting inhibition on flame propagation velocity, which means the smaller the size of the particle is, the better inhibition effect will be.

关 键 词：碳酸氢钠 粒径 铝粉 火焰传播 惰化抑制 

分 类 号：X932[环境科学与工程—安全科学]