竖直管道中氧化铝抑制铝粉爆炸特性研究

doi:10.11949/0438-1157.20190620

化工学报 ›› 2020, Vol. 71 ›› Issue (4): 1929-1939.DOI: 10.11949/0438-1157.20190620

竖直管道中氧化铝抑制铝粉爆炸特性研究

靳红旺¹(),郑立刚^1,²(),朱小超¹,于水军^1,²,潘荣锟^1,²,杜德朋¹,窦增果¹

^1. 河南理工大学安全科学与工程学院，瓦斯地质与瓦斯治理国家重点实验室培育基地，河南焦作 454003
^2. 煤炭安全生产与清洁高效利用省部共建协同创新中心，河南焦作 454003

收稿日期:2019-06-04 修回日期:2019-10-12 出版日期:2020-04-05 发布日期:2020-04-05
通讯作者: 郑立刚
作者简介:靳红旺（1994—），男，硕士研究生，jinhongwang@163.com
基金资助:
国家重点研发计划项目(2018YFC0808100);国家自然科学基金项目(51674104);河南理工大学创新型科研团队项目(T2018-2)

Inhibition effect of alumina on aluminum powder explosion characteristics in vertical duct

Hongwang JIN¹(),Ligang ZHENG^1,²(),Xiaochao ZHU¹,Shuijun YU^1,²,Rongkun PAN^1,²,Depeng DU¹,Zengguo DOU¹

^1. State Key Laboratory Cultivation Base for Gas Geology and Gas Control, College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
^2. State Collaborative Innovation Center of Coal Work Safety and Clean-efficiency Utilization, Jiaozuo 454003, Henan, China

Received:2019-06-04 Revised:2019-10-12 Online:2020-04-05 Published:2020-04-05
Contact: Ligang ZHENG

摘要/Abstract

摘要：

为研究氧化铝对铝粉爆炸的影响，在自行搭建的实验平台进行铝粉爆炸实验研究。对火焰结构演化特性、火焰锋面传播特性和爆炸超压波形分析的结果表明：在惰化比不断增加的情况下，氧化铝表现出对铝粉爆炸火焰的明显抑制作用，且粒径较小的氧化铝粉抑制效果更好；在火焰锋面传播方面，氧化铝对后期火焰锋面传播抑制效果更明显，火焰传播速度下降，锋面到达管口需要更长的时间；粒径4 μm的氧化铝在其惰化比φ=30%的条件下，第二波爆炸超压波峰消失，在惰化比φ=70%条件下，抑爆效率高达88.9%，抑爆效果十分明显。但是粒径为89 μm的氧化铝抑爆效用有明显的极限值，超过该极限值，抑爆效用不再提高。

关键词: 铝粉爆炸, 氧化铝, 惰化比, 火焰传播, 超压

Abstract:

In order to study the influence of alumina on the explosion of aluminum powder, the explosion experiment was carried out in a self-built vertical duct. The flame structural evolution, flame front propagation and explosion overpressure waveform were analyzed. The results show that with the increase in the inerting ratio, alumina showed an obvious inhibitory effect on the flame at the aluminum explosion, and the alumina powder with small particle size had better inhibitory effect. Moreover, alumina exerted obvious inhibitory effect on flame front propagation in later stage, the flame propagation speed decreased, and the time required for the front to reach the duct exit was longer. For 4 μm alumina, the second peak overpressure disappeared at the inerting ratio of φ =30%, while the suppression efficiency was as high as 88.9% at the inerting ratio of φ =70%. However, the alumina explosion-proof effect with a particle size of 89 μm has obvious limit values. Exceeding the limit value, the explosion-proof effect is no longer improved.

Key words: aluminum explosion, alumina, inerting ratio, flame propagation, overpressure

中图分类号:

X 945

靳红旺, 郑立刚, 朱小超, 于水军, 潘荣锟, 杜德朋, 窦增果. 竖直管道中氧化铝抑制铝粉爆炸特性研究[J]. 化工学报, 2020, 71(4): 1929-1939.

Hongwang JIN, Ligang ZHENG, Xiaochao ZHU, Shuijun YU, Rongkun PAN, Depeng DU, Zengguo DOU. Inhibition effect of alumina on aluminum powder explosion characteristics in vertical duct[J]. CIESC Journal, 2020, 71(4): 1929-1939.

图/表 11

图2 实验铝粉表征测试结果

Fig.2 Characterization of aluminum powder

图1 实验系统

Fig.1 Experimental system

图3 实验氧化铝粒径分布

Fig.3 PSD of two aluminum oxide powders

图4 火焰锋面结构演化图

Fig.4 Evolution diagram of flame front structure

图5 火焰锋面位置随时间的变化

Fig.5 Relation of flame front position with time

图6 火焰锋面平均速度

Fig.6 Average velocity of flame front versus flame front position

图7 火焰锋面到达管口时间

Fig.7 Arrival time of flame front

图8 爆炸超压波形

Fig.8 Waveform of explosion overpressure

图9 爆炸超压峰值及压力下降率曲线

Fig.9 Dependence of peak overpressures and their drop rates on inerting ratio

图10 最大超压峰值图及其下降率曲线

Fig.10 Dependence of maximum peak overpressure and its drop rate on inerting ratio

图11 氧化铝抑制机理

Fig.11 Mechanism of aluminum oxide inhibition

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竖直管道中氧化铝抑制铝粉爆炸特性研究

Inhibition effect of alumina on aluminum powder explosion characteristics in vertical duct

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