A review of metal dust explosion characteristics and protection technologies

The research progress of metal dust explosion venting characteristics and its protection technology is expounded and summarized in this paper. Based on the summary of previous research, the main focus of current attention and the key scientific issues to be addressed are clearly stated. It mainly includes the explosion kinetic properties of the highly reactive combustible gas/metal dust two-phase system and its influencing mechanism, in particular, the chemical reaction process and combustion mechanism of two-phase system explosions; the rupture failure forms and influence mechanisms of rupture disc rupture in petrochemical devices under dynamic loading at different pressure rise rates; and, importantly, the developing appropriate explosion performance testing techniques and guidelines. Meanwhile, the active suppression characteristics and influence mechanism of gas/metal dust two-phase system explosion venting are also the focus of attention. In particular, the attenuation process and influence mechanism of hydrogen/magnesium powder explosion venting flame and shock wave under explosion suppression of active powder spraying, efficient explosion suppression agent and the size effect of the explosion suppression performance and its explosion suppression criterion. The solution of the above scientific problems can provide a theoretical basis for the development of key technologies for metal dust explosion protection. This provides crucial technical support for reducing the probability of metal dust explosion accidents, mitigating accident consequences, and promoting the safe and rapid development of industry.