Minimum ignition energies of pure magnesium powders due to electrostatic discharges and nitrogen's effect

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• 作者：Kwangseok Choi^a ; ^{choiks@s.jniosh.go.jp" class="auth_mail" title="E-mail the corresponding author} ; Hitoshi Sakasai^b ; Koujirou Nishimura^c
• 关键词：Electrostatic discharges ; Minimum ignition energy ; Magnesium ; Nitrogen ; Dust explosions
• 刊名：Journal of Loss Prevention in the Process Industries
• 出版年：2016
• 出版时间：May 2016
• 年：2016
• 卷：41
• 期：Complete
• 页码：144-146
• 全文大小：470 K

文摘

This paper experimentally investigated the relation between the minimum ignition energy (MIE) of magnesium powders as well as the effect of inert nitrogen (N₂) on the MIE. The modified Hartmann vertical-tube apparatus and four kinds of different-sized pure magnesium powders (median particle size, D50; 28.1 μm–89.8 μm) were used in this study. The MIE of the most sensitive magnesium powder was 4 mJ, which was affected by the powder particle size (D50; 28.1 μm). The MIE of magnesium powder increased with an increase in the N₂ concentration for the inerting technique. The magnesium dust explosion with an electrostatic discharge of 1000 mJ was suppressed completely at an N₂ concentration range of more than 98%. The experimental data presented in this paper will be useful for preventing magnesium dust explosions generated from electrostatic discharges.