Explosion characteristics and suppression of hybrid Mg/H2 mixtures

In the production of magnesium hydride, hybrid Mg/H2 mixtures has a risk of explosion; therefore, systematic experiments were conducted to study its explosion characteristics and suppression. According to the results, the maximum rate of explosion pressure rise (dP/dt)max of hybrid Mg/H2 mixtures was more the twice than that of pure Mg. Five common explosion suppressants were individually added to hybrid Mg/H2 mixtures to inhibit dust explosion. Na2CO3, CaCO3, and (NH4)2HPO3 exhibited great inhibitory abilities for hybrid Mg/H2 mixtures explosion; however, melamine-cyanurate acid (MCA) and melamine polyphosphate (MPP) could stimulate the explosion. The mechanisms underlying MCA and MPP promotion of the hybrid Mg/H2 mixtures explosion were determined, namely the high concentration of flammable gases, such as ammonia, released after their thermal decomposition. These gases can ignite and intensify the explosion of hybrid Mg/H2 mix-tures. This study provides a reference for reducing the risk in the H2 storage system of Mg. (c) 2021 Hydrogen Energy Publications LLC. Published by Elsevier Ltd. All rights reserved.

Automated summary

In the production of magnesium hydride, systematic experiments were conducted to study the explosion characteristics and suppression of hybrid Mg/H2 mixtures. It was found that certain explosion suppressants were effective, while others could actually stimulate the explosion by releasing flammable gases. This study provides valuable insights for reducing the risk in the H2 storage system of Mg.