Study on inhibition effect and mechanism of micron and nano Al(OH)3 powders on deflagration flame of poplar dust.

In this paper, the Hartmann experimental system was used to study the effect of different proportions of micron and nano Al(OH) 3 powders on the deflagration flame propagation of poplar dust. In the course of the experiment, a high-speed camera was used to record the flame shape and characteristic parameters in the process of poplar dust deflagration flame propagation. Combined with the SEM images of poplar dust explosion products under different conditions, the pyrolysis characteristic curves of poplar dust, micron and nano Al(OH) 3 powders, the inhibition mechanism of micron and nano Al(OH) 3 powders on poplar dust deflagration was analyzed. The experimental results show that micron and nano Al(OH) 3 powders have obvious inhibition effect on poplar dust deflagration flame, and better inhibition effect can be achieved when 35% nano Al(OH) 3 powder is added. And under the condition of adding the same proportion of micron and nano Al(OH) 3 powders, the inhibition effect of nano Al(OH) 3 powder is better than that of micron Al(OH) 3 powder. [ABSTRACT FROM AUTHOR]