Preparation and characterization of flower-like Mg-Al hydrotalcite powder for suppressing methane explosion

Abstract

A novel flower-like Mg-Al hydrotalcite powder was successfully prepared using coprecipitation method and then characterized for suppressing methane explosion. The influences of Mg-Al hydrotalcite on the explosion pressure and flame propagation characteristics of methane were studied using a 5 L pipeline explosion experimental setup, and its explosion suppression performance was compared with that of magnesium hydroxide and aluminum hydroxide. The results show that the novel Mg-Al hydrotalcite powder prepared in this study has an excellent methane explosion suppression performance. The maximum explosion pressure of methane after adding 0.2 g/L Mg-Al hydrotalcite powder was decreased by 77.72%, and the average flame propagation velocity of methane explosion was decreased by 66.34%. With an increase of the Mg-Al hydrotalcite powder concentration, the main methane flame structure became progressively discrete. Combined with the physical and chemical properties of Mg-Al hydrotalcite powder, its explosion suppression mechanism on 9.5% methane was discussed.