Abstract: In order to improve the current safety situation of China's powder-related industries, reduce the risk of dust explosion, this paper successfully modified a bentonite material and in the self-built dust explosion flame propagation device, successfully verified the different particle sizes and mass concentrations of modified bentonite material on 200 g/m3 500 mesh PMMA dust explosion flame propagation inhibition effect, and analyze the mechanism of its explosion suppression. Experimental results show that the modified bentonite material has a certain explosion suppression performance, and the inhibition effect increases with the reduction of modified bentonite material particle size and the increase of mass concentration; the maximum flame propagation velocity inhibition rates of modified bentonite materials with different concentrations and large particle sizes for PMMA dust are 2.81%, 15.47%, 21.38% and 63.57%; the minimum flame propagation velocity inhibition rates of modified bentonite materials with different concentrations and large particle sizes for PMMA dust are 25.73%, 26.16%, 56.68%, 31.5%.

Key words: modified bentonite, PMMA, flame propagation velocity, explosion suppression, powder