Minimum ignition energy of nano and micro Ti powder in the presence of inert nano TiO2 powder
Minimum ignition energy of nano and micro Ti powder in the presence of inert nano TiO2 powder
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惰性纳米TiO2粉末存在下纳米和微米钛粉的最小点火能
DOI：
10.1016/j.jhazmat.2014.04.007
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发表时间：
2014
影响因子：
13.6
通讯作者：
Li Chang
中科院分区：
文献类型：
--
作者：
Yuan Chunmiao;Amyotte Paul R.;Hossain Md. Nur;Li Chang
利用Mike 3型点火感度仪研究了纳米TiO2粉体对纳米和微米Ti粉体点火感度的惰化作用。“少一点不够好”也适用于与纳米级固体惰性剂混合的微米Ti粉。混合物的MIE没有显着增加，直到TiO 2的百分比超过50%。纳米TiO2粉末与纳米Ti粉末混合时，特别是在较高的粉尘负荷下，作为惰性剂是无效的。即使添加90%的纳米TiO2粉体，由于统计能低至2.1 mJ，混合物仍表现出较高的点火感度。微Ti粉与纳米TiO2粉混合后，在低水平粉尘爆炸条件下，可能发生未燃金属颗粒引起的层燃。这样的层火可能导致第二次分散后的剧烈粉尘爆炸。因此，即使在电火花电位低的情况下，也需要额外注意防止金属层着火。在纳米钛粉的情况下，没有层火灾观察到，因为较少的可燃性材料中所涉及的混合物的调查，和更快的火焰传播的纳米粒子云。
The inerting effect of nano-sized TiO2powder on ignition sensitivity of nano and micro Ti powders was investigated with a Mike 3 apparatus. “A little is not good enough” is also suitable for micro Ti powders mixed with nano-sized solid inertants. MIE of the mixtures did not significantly increase until the TiO2percentage exceeded 50%. Nano-sized TiO2powders were ineffective as an inertant when mixed with nano Ti powders, especially at higher dust loadings. Even with 90% nano TiO2powder, mixtures still showed high ignition sensitivity because the statistic energy was as low as 2.1 mJ. Layer fires induced by ignited but unburned metal particles may occur for micro Ti powders mixed with nano TiO2powders following a low level dust explosion. Such layer fires could lead to a violent dust explosion after a second dispersion. Thus, additional attention is needed to prevent metallic layer fires even where electric spark potential is low. In the case of nano Ti powder, no layer fires were observed because of less flammable material involved in the mixtures investigated, and faster flame propagation in nanoparticle clouds.