Study on derived hydrogen and ignition influencing factors of moist magnesium debris

• Published in: Fuel (Guildford) Vol. 335; p. 126964
• Main Authors: Xiong, Xinyu, Gao, Kai, Mu, Jie, Ji, Changquan, Li, Bin, Zhang, Dan, Xu, Yadong, Xie, Lifeng
• Format: Journal Article
• Language: English
• Published: Elsevier Ltd 01.03.2023
• Subjects: Derived hydrogen; Erosion reaction; Hazard source treatment; Hydrogen explosion; Moisture content; P0; PBR; ΔV; Hazard source treatment; Hydrogen explosion; Erosion reaction; TMg; VMg; Tair; Pmax; Derived hydrogen; Moisture content; ΔTair; ΔTMg; T0; d50; (dp/dt)max; Pair
• ISSN: 0016-2361; 1873-7153
• DOI: 10.1016/j.fuel.2022.126964

[Display omitted] •Moist Mg debris erosion reaction rate rises and then falls as moisture content rises.•High temperature adds ignition potential of moist Mg debris erosion reaction system.•The raising specific surface area of moist Mg debris fastens erosion reaction rate.•The raising Mg debris pile layer rises micro-reaction efficiency and water depletion.•Study results offer a reference for the hazard rating sort of active metal storage. While active metallic magnesium is extensively employed, the generated magnesium debris is prone to derive hydrogen gas during storage, which poses potential explosion hazards. Therefore, a 1 L micro-reaction device and test system were self-designed to study the variation law and ignition hazard of hydrogen gas derived from moist magnesium debris. It was discovered that the hydrogen content derived from moist magnesium debris and system temperature both exhibited a variation law of first increasing and then decreasing with increasing moisture content. The higher the initial temperature, the smaller the size of magnesium debris, and the more accumulation layers of magnesium debris, then the faster the hydrogen production rate of moist magnesium debris, and the higher the ignition sensitivity of the system. It also aroused the peak of the variation curve of derived hydrogen increase value and system temperature increase value to shift towards the larger moisture content. Evidently, apart from the risk of dust explosion, the risk of hydrogen explosion deserves more attention when the active metal dust has been accumulated over a long period. It is very necessary to adopt ways and means to suppress hydrogen explosions. The research results offer a reference for the hazard rating classification of industrial active metals in storage, transportation, and other key aspects under different working conditions.