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

MAO Wenzhe; ZHANG Guotao; YANG Shuaishuai; XU Zihui; WANG Yan; JI Wentao

doi:10.11883/bzycj-2023-0363

Volume 44 Issue 6

Jun. 2024

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MAO Wenzhe, ZHANG Guotao, YANG Shuaishuai, XU Zihui, WANG Yan, JI Wentao. Characteristics of hydrogenated magnesium dust explosion flame propagating in a semi-enclosed space[J]. Explosion And Shock Waves, 2024, 44(6): 065401. doi: 10.11883/bzycj-2023-0363

Citation:

MAO Wenzhe, ZHANG Guotao, YANG Shuaishuai, XU Zihui, WANG Yan, JI Wentao. Characteristics of hydrogenated magnesium dust explosion flame propagating in a semi-enclosed space[J]. Explosion And Shock Waves, 2024, 44(6): 065401. doi: 10.11883/bzycj-2023-0363

Citation:

MAO Wenzhe, ZHANG Guotao, YANG Shuaishuai, XU Zihui, WANG Yan, JI Wentao. Characteristics of hydrogenated magnesium dust explosion flame propagating in a semi-enclosed space[J]. Explosion And Shock Waves, 2024, 44(6): 065401. doi: 10.11883/bzycj-2023-0363

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

doi: 10.11883/bzycj-2023-0363

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

Received Date: 2023-10-08
Rev Recd Date: 2024-03-05

Available Online: 2024-03-05

Publish Date: 2024-06-18

Abstract

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

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References(25)

References

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