Flame propagation behaviors and influential factors of TiH2 dust explosions at a constant pressure
Flame propagation behaviors and influential factors of TiH2 dust explosions at a constant pressure
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恒压TiH2粉尘爆炸火焰传播行为及影响因素
DOI：
10.1016/j.ijhydene.2018.06.145
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发表时间：
2018-08-16
影响因子：
7.2
通讯作者：
Hua, Fang
中科院分区：
文献类型：
--
作者：
Cheng, Yang-fan;Meng, Xiang-rui;Hua, Fang
本文利用透明乳胶球装置，对近恒压条件下TiH_2粉尘云中火焰传播进行了一系列实验研究。研究了TiH 2粉尘云燃烧性能的影响因素，包括粉尘浓度、粒径、等压空间尺度和氧含量。结果表明，贫油混合气中燃烧速度随粉尘浓度的增加而增加，在超过化学计量比后进入稳定期，而平均粒径（D-50）为48和106 μ m时，火焰速度随粉尘浓度的变化趋势不同。粉尘云的火焰传播速度与等压空间尺度和氧气含量呈正相关。TiH_2粉尘的燃烧机理主要受扩散机制控制，氢气的出现加速了TiH_2颗粒的燃烧速率，使TiH_2粉尘由离散介质转变为连续介质，这可能是相同浓度下，无论是在空气还是氧气气氛中，TiH_2粉尘云中的火焰速度均大于Ti粉尘云中的火焰速度的原因。(C)2018年氢能出版有限责任公司。由爱思唯尔有限公司出版。保留所有权利。
The flame propagation through TiH2 dust cloud at near constant pressure condition is studied in a series of experiments using an apparatus with transparent latex balloons. The influential factors for the combustion performance of TiH2 dust cloud, including dust concentration, particle size, scale of isobaric space and oxygen content are investigated. Results show that the burning velocity increases with dust concentration in the fuel-lean mixtures, and then plateaus after crossing the stoichiometric condition, while the trend of flame speed changing with dust concentration varies for different mean particle sizes (D-50) of 48 and 106 mu m. The flame propagation speed of dust cloud is positively correlated to the isobaric space scale and oxygen content. The burning mechanism of TiH2 dust is thought to be mainly controlled by diffusion regime, the appearance of hydrogen gas accelerates the combustion rate of TiH2 particles and also makes the TiH2 dust changed from a discrete media to a continuum, which may account for the phenomenon that the flame speed in dust cloud of TiH2 is larger than that of Ti at the same concentration no matter in air or oxygen atmosphere. (C) 2018 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.