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中南大学学报(自然科学版)

Journal of Central South University

第51卷    第5期    总第309期    2020年5月

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文章编号:1672-7207(2020)05-1211-10
抛光工艺中镁铝合金粉燃爆参数分析
王秋红1,闵锐1,孙艺林1,代爱萍2

(1. 西安科技大学 安全科学与工程学院,陕西 西安,710054;
2. 西安科技大学 化学与化工学院,陕西 西安,710054
)

摘 要: 采用粉尘云最低着火温度测试装置及20 L球形爆炸实验系统设计研究微米级镁铝合金粉爆炸特性参数。研究结果表明:镁铝合金粉尘云最低着火温度随分散压力的增大呈现先减少后增加的趋势,分散压力工况点对应最低的着火温度随着粒径的减少而出现下移现象;镁铝合金粉存在1个临界质量浓度,当镁铝合金粉尘质量浓度低于临界质量浓度时,其最低着火温度受粉尘质量浓度的影响较大,当粉尘质量浓度大于临界质量浓度时,其最低着火温度受粉尘质量浓度影响较小,镁铝合金粉临界质量浓度为4 540 g/m3;在同一粒径下爆炸压力随着质量浓度的增加先增大后减小,并存在1个最大爆炸质量浓度使得爆炸压力达到最大值,在1 750 g/m3粉尘质量浓度下,粒径为502.2,293.6和59.8 μm的镁铝合金粉均达到最大的爆炸压力,并在500 g/m3粉尘质量浓度下,粒径为502.2,293.6和59.8 μm镁铝合金粉的极限氧体积分数分别为15%,13%和4%。

 

关键字: 镁铝合金;最低着火温度;粉尘爆炸;爆炸压力;极限氧体积分数

Analysis of magnesium-aluminum alloy powder burning explosion parameters in the polishing process
WANG Qiuhong1, MIN Rui1, SUN Yilin1, DAI Aiping2

1. School of Safety Science and Engineering, Xi''an University of Science and Technology, Xi''an 710054, China;
2. College of Chemistry and Chemical Engineering, Xi''an University of Science and Technology, Xi''an 710054, China

Abstract:The explosion characteristic parameters of micron magnesium-aluminum alloy powder were studied by using 20 L spherical explosion experimental system and testing device of minimum ignition temperature of dust cloud. The results show that the minimum ignition temperature of magnesium-aluminum alloy dust cloud firstly decreases and then increases with the increase of dispersion pressure. The minimum ignition temperature corresponding to dispersion pressure working point decreases with the decrease of particle size. There is a critical mass concentration when the dust mass concentration of magnesium-aluminum alloy is lower than the critical mass concentration, and the minimum ignition temperature is greatly affected by the dust mass concentration. When the dust mass concentration is higher than the critical mass concentration, the minimum ignition temperature is less affected by the dust mass concentration, and the critical mass concentration of magnesium-aluminum alloy powder is 4 540 g/m3. At the same particle size, the explosion pressure firstly increases and then decreases with the increase of the mass concentration. There is a maximum explosion mass concentration, which makes the explosion pressure reach the maximum value. The explosion pressure of magnesium-aluminum alloy powder with the particle size of 502.2, 293.6 and 59.8 μm reaches the maximum at alloy powders mass concentration of 1 750 g/m3. Besides, the limited oxygen volume fractions of magnesium-aluminum alloy powder are 15%, 13% and 4% with particle sizes of 502.2, 293.6 and 59.8 μm at alloy powder mass concentration of 500 g/m3.

 

Key words: magnesium-aluminum alloy; minimum ignition temperature; dust explosion; explosion pressure; limited oxygen volume fraction

中南大学学报(自然科学版)
  ISSN 1672-7207
CN 43-1426/N
ZDXZAC
中南大学学报(英文版)
  ISSN 2095-2899
CN 43-1516/TB
JCSTFT
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