半封闭空间内氢化镁粉尘爆炸火焰的传播特性

毛文哲; 张国涛; 杨帅帅; 徐子晖; 王燕; 纪文涛

doi:10.11883/bzycj-2023-0363

半封闭空间内氢化镁粉尘爆炸火焰的传播特性

doi: 10.11883/bzycj-2023-0363

毛文哲^{1, 2, 3,},
张国涛^{1, 2, 3},
杨帅帅^{1, 2, 3},
徐子晖^{1, 2, 3},
王燕^{1, 2, 3},
纪文涛^{1, 2, 3, ,}

1.
河南理工大学安全科学与工程学院，河南焦作 454003
2.
河南理工大学河南省燃爆动力灾害预警与应急工程技术研究中心，河南焦作 454003
3.
河南理工大学煤炭安全生产与清洁利用省部共建协同创新中心，河南焦作 454003

基金项目: 国家自然科学基金（52374197, U22A20120）；河南省优秀青年科学基金（212300410042）

详细信息

作者简介:
毛文哲（1998－　），男，硕士研究生，kane_0529@163.com

通讯作者:
纪文涛（1989－　），男，博士，副教授，jiwentao@hpu.edu.cn

中图分类号: O381
计量
- 文章访问数: 198
- HTML全文浏览量: 53
- PDF下载量: 79
- 被引次数: 0
出版历程
- 收稿日期: 2023-10-08
- 修回日期: 2024-03-05
- 网络出版日期: 2024-03-05
- 刊出日期: 2024-06-18

Characteristics of hydrogenated magnesium dust explosion flame propagating in a semi-enclosed space

MAO Wenzhe^{1, 2, 3
,},
ZHANG Guotao^{1, 2, 3},
YANG Shuaishuai^{1, 2, 3},
XU Zihui^{1, 2, 3},
WANG Yan^{1, 2, 3},
JI Wentao^{1, 2, 3
, ,}

1.
College of Safety Science and Engineering, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
Explosion Dynamic Disaster Early Warning and Emergency Engineering Technology Research Center of Henan Province, Henan Polytechnic University, Jiaozuo 454003, Henan, China
3.
Collaborative Innovation Center of Coal Work Safety and Clean High Efficiency Utilization, Henan Polytechnic University, Jiaozuo 454003, Henan, China

摘要

摘要: 在自行搭建的5 L粉尘爆炸火焰传播特性实验装置中，实验研究了半封闭空间内氢化镁(MgH₂)粉尘爆炸火焰的传播特性。实验结果表明：随MgH₂粉尘浓度的提高，MgH₂粉尘爆炸火焰由点火至稳定传播所用时间先缩短后延长以及预热区宽度先减小后增大，火焰亮度、锋面平滑度、及火焰传播速度呈先提高后降低的趋势，并在质量浓度为800 g/m³时呈最佳燃烧状态。不同浓度的MgH₂粉尘爆炸火焰传播瞬时速度整体呈波动趋势，波动幅度随浓度的提高而先减小后增大，800 g/m³时波动幅度最小，瞬时传播速度变化趋势随浓度的变化呈现不同的变化趋势。最后，根据MgH₂爆炸产物的XRD测试结果，分析MgH₂粉尘爆炸反应机理，发现MgH₂粉尘爆炸是以MgH₂燃烧反应为主并伴随有MgH₂和Mg(OH)₂分解以及Mg和H₂氧化等多个总包反应的复杂过程，爆炸反应的最终产物为MgO。
- 半封闭空间 /
- 储氢金属 /
- 氢化镁 /
- 爆炸 /
- 火焰传播
Abstract: In the experiment conducted using a custom-built 5-L dust explosion flame propagation apparatus, the focus of the study was the characteristics of the flame propagation of magnesium hydride (MgH₂) dust explosions within a semi-enclosed space. The experimental results showed that as the concentration of MgH₂ dust increased, the time required for the MgH₂ dust explosion flame to transfer from ignition to stable propagation decreased initially, but then increased as the dust concentration further increased. Similarly, the width of the preheating zone followed the same pattern. Initially, it decreased with increasing dust concentration, but once the concentration reached a certain threshold, it started to increase. Beyond that, the flame brightness, smoothness of the flame front, and flame propagation speed all showed similar trends. They initially increased as the MgH₂ dust concentration increased, suggesting enhanced combustion activity. However, as the concentration further increased, these characteristics started to decline, indicating a diminishing combustion efficiency. The best combustion state was observed at a dust mass concentration of 800 g/m³. The instantaneous speed of the MgH₂ dust explosion flame propagation exhibited a fluctuating pattern across different concentrations. The fluctuation amplitude initially decreased as the dust concentration increased, suggesting a more stable flame propagation. However, beyond a certain concentration, the fluctuation amplitude began to increase again. It is worth noting that the change in instantaneous propagation speed variation displayed different trends as the concentration varied. The exact behaviors were found to be dependent on the particular concentration level. Finally, analysis of the X-ray diffraction (XRD) test results of the MgH₂ explosion products revealed a complex reaction mechanism. The MgH₂ dust explosion primarily involved the combustion reaction of MgH₂ but also included multiple overall reactions such as the decomposition of MgH₂ and Mg(OH)₂, as well as the oxidation of Mg and H₂. The final product of the explosion reaction was identified to be MgO.
- semi-enclosed space /
- hydrogen storage metal /
- magnesium hydride /
- explosion /
- flame propagation

HTML全文

图 1 5 L粉尘爆炸火焰传播特性实验装置

Figure 1. The experimental device with a 5-L powder container for exploring dust explosion flame propagation characteristics

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图 2 MgH₂粉尘粒径分布与微观形貌

Figure 2. MgH₂ dust particle size distribution and micromorphology

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图 3 不同质量浓度的MgH₂粉尘爆炸压力和压升速率

Figure 3. Explosion pressure and pressure rise rate of MgH₂ dust as a function of dust mass concentration

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图 4 半封闭空间内200 g/m³MgH₂粉尘火焰形貌结构

Figure 4. Morphological structure of 200 g/m³MgH₂ dust flame in a semi-enclosed space

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图 5 半封闭空间内400 g/m³MgH₂粉尘火焰形貌结构

Figure 5. Morphological structure of 400 g/m³MgH₂ dust flame in a semi-enclosed space

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图 6 半封闭空间内600 g/m³MgH₂粉尘火焰形貌结构

Figure 6. Morphological structure of 600 g/m³MgH₂ dust flame in a semi-enclosed space

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图 7 半封闭空间内800 g/m³MgH₂粉尘火焰形貌结构

Figure 7. Morphological structure of 800 g/m³MgH₂ dust flame in a semi-enclosed space

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图 8 半封闭空间内1000 g/m³MgH₂粉尘火焰形貌结构

Figure 8. Morphological structure of 1000 g/m³MgH₂ dust flame in a semi-enclosed space

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图 9 MgH₂爆炸火焰结构

Figure 9. MgH₂ explosive flame structure

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图 10 半封闭空间内不同浓度MgH₂粉尘爆炸火焰锋面位置

Figure 10. Location of flame fronts of explosion flames with different concentrations of MgH₂ dust in a semi-enclosed space

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图 11 半封闭空间内不同浓度MgH₂粉尘爆炸火焰锋面瞬时速度

Figure 11. Instantaneous velocity of flame fronts of explosion flames of different concentrations of MgH₂ dust in a semi-enclosed space

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图 12 MgH₂爆炸产物XRD图

Figure 12. XRD diagram of MgH₂ explosive products

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图 13 MgH₂燃烧反应机理

Figure 13. Combustion reaction mechanism of MgH₂

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