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

Abstract

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.