阻塞比对竖直管道中铝粉爆炸特性的影响研究

朱小超; 郑立刚; 于水军; 王亚磊; 李刚; 杜德朋; 窦增果

doi:10.11883/bzycj-2019-0006

阻塞比对竖直管道中铝粉爆炸特性的影响研究

doi: 10.11883/bzycj-2019-0006

朱小超^1,,
郑立刚^{1, 2, ,},
于水军^{1, 2},
王亚磊¹,
李刚¹,
杜德朋¹,
窦增果¹

1.
河南理工大学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.
河南理工大学煤炭安全生产河南省协同创新中心，河南焦作 454003

基金项目: 国家自然科学基金（51674104，51874120）；中国博士后科学基金（2013M540570）；河南理工大学创新型科研团队（T2018-2）

详细信息

作者简介:
朱小超（1992－　），男，硕士研究生，1039137325@qq.com

通讯作者:
郑立刚（1979－　），男，博士，教授，zhengligang97@163.com

中图分类号: O389; X945
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- 被引次数: 5
出版历程
- 收稿日期: 2019-01-08
- 修回日期: 2019-01-24
- 网络出版日期: 2019-09-25
- 刊出日期: 2019-10-01

Effect of blocking ratio on aluminum powder explosion’s characteristicsin vertical duct

ZHU Xiaochao^1
,,
ZHENG Ligang^{1, 2
, ,},
YU Shuijun^{1, 2},
WANG Yalei¹,
LI Gang¹,
DU Depeng¹,
DOU Zengguo¹

1.
State Key Laboratory Cultivation Base for Gas Geology and Gas Control, Henan Polytechnic University, Jiaozuo 454003, Henan, China
2.
The Collaborative Innovation Center of Coal Safety, Production of Henan Province, Henan Polytechnic University, Jiaozuo 454003, Henan, China

摘要

摘要: 在自行搭建的竖直透明管道喷粉平台中开展了铝粉尘爆炸实验研究，通过对铝粉爆炸火焰锋面演化及压力变化等特征进行分析，探究泄爆口阻塞比对铝粉爆炸特性的影响规律。结果表明：阻塞比对较小粒径铝粉爆炸火焰锋面结构影响较大。管道中爆炸超压呈双峰形式；对于较小粒径铝粉，超压双峰主导地位在拐点φ=0.4（φ为阻塞比）处发生反转，且第一波峰值与第二波峰值通过转折点时变化趋势不同，第一波峰值随阻塞比增加而升高，并以φ=0.4为拐点，斜率大大提升，而第二波峰值随阻塞比的增加先升后降，且在φ=0.4时达到最大；铝粉粒径较大时，波峰值变化趋势与小粒径类似，拐点后移至φ=0.6。最大(主导)超压峰值随阻塞比增加而增加；小粒径粉尘更容易产生危险性爆炸超压。
- 阻塞比 /
- 铝粉 /
- 爆炸 /
- 管道 /
- 火焰传播 /
- 超压
Abstract: In this work, experimenting on a self-built vertically transparent duct, we investigated the influence of the blocking ratio (φ) for duct-end venting on the explosive characteristics of aluminum dust explosion through analysis of its such characteristics as the flame front evolution and pressure history. The results show that the blocking ratio had a great influence on the flame front structure of aluminum powder of a small particle size. The overpressure in the pipeline exhibited a bimodal waveform and there was an inflection point of the blocking ratio φ=0.4 where the dominance of two overpressure peaks reversed. The first overpressure peak as a function of the blocking ratio was different from that of the second beyond the inflection point. The first overpressure peak increased as did the blocking ratio, and the increase rate rose greatly with φ=0.4 as the turning point. The second overpressure peak first rose and then fell with the increase of the blocking ratio, and reached the maximum at φ=0.4. Both peak values as a function of the blocking ratio for the large particle size were similar to that for the small particle size. However, the inflection point shifted to φ=0.6. The maximum (dominant) overpressure peak increased with the increase of the blocking ratio. A smaller particle size dust is prone to generating a more hazardous overpressure.
- blocking ratio /
- aluminum /
- explosion /
- duct /
- flame propagation /
- overpressure

HTML全文

图 1 实验系统图

Figure 1. Illustration of experimental setup

下载: 全尺寸图片幻灯片

图 2 实验铝粉表征测试结果

Figure 2. Test results of aluminum powder surface characteristics

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图 3 D₅₀=17 μm铝粉在不同阻塞比条件下火焰前锋结构

Figure 3. Flame front structure of D₅₀=17 μm aluminum powder at different blocking ratios

下载: 全尺寸图片幻灯片

图 4 D₅₀=48 μm铝粉在不同阻塞比条件下火焰前锋结构

Figure 4. Flame front structure of D₅₀=48 μm aluminum powder at different blocking ratios

下载: 全尺寸图片幻灯片

图 5 在不同阻塞比条件下火焰锋面发展对比图

Figure 5. Comparison of the development of flame fronts at different blocking ratios

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图 6 锋面位置与压力波形对照分析图

Figure 6. Contrast analysis of frontal position and pressure waveform

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图 7 铝颗粒燃烧顺序机制图

Figure 7. Combustion sequence of aluminum particles

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图 8 各阻塞比条件下超压波形图

Figure 8. Overpressure waveform at different blocking ratios

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图 9 D₅₀=17.1 μm和D₅₀=48.3 μm铝粉在各阻塞比条件下波峰值比较

Figure 9. Comparison of peak values of D₅₀=17.1 μm and D₅₀=48.3 μm aluminum powder at different blocking ratios

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图 10 阻塞比对反应进行影响机制图

Figure 10. Illustration of block ratio effect’s mechanism

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图 11 最大超压柱形分布图和最大超压上升率趋势图

Figure 11. Maximum overpressure and rate of maximum overpressure rise

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