Effects of NH4H2PO4 and SiO2 power on propagation characteristics of aluminum dust flame

doi:10.16265/j.cnki.issn1003-3033.2017.08.008

Abstract

Abstract: For the sake of exploring the mechanism by which inert powder affects structure and propagation characteristics of aluminium flame in a confined space, experiments were carried out. The flame shape, flame temperature and flame propagation velocity of aluminium flame were measured when 20% mass fraction of NH₄H₂PO₄ and SiO₂ powder were added to by using a small opening vertical pipe, a high-speed camera and a micro thermocouple. The results show that both NH₄H₂PO₄ and SiO₂ powder can dilute the concentration of aluminum powder and weaken the reaction intensity, that with increase of particle size of aluminum powder, the inhibition effect of inert powder on maximum flame temperature of aluminum powder firstly increases and then decreases, and the inhibition effect reaches the maximum when the particle size of aluminum powder is 30 μm, that the inhibition effect of inert powder on flame propagation velocity of aluminum powder is negatively correlated with the particle size of aluminum powder, and that the inhibition effect of NH₄H₂PO₄ powder on aluminum powder flame is more obvious than that of SiO₂.

Key words: inert powder, aluminum powder, flame propagation, inert inhibition, combustion characteristics

CLC Number:

X932

TANG Wenwen, CHEN Xianfeng, NIU Yi, ZHANG Hongming, DAI Huaming, WANG Yujie. Effects of NH₄H₂PO₄ and SiO₂ power on propagation characteristics of aluminum dust flame[J]. China Safety Science Journal, 2017, 27(8): 44-49.

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Effects of NH₄H₂PO₄ and SiO₂ power on propagation characteristics of aluminum dust flame

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