Study on optimum mass fraction of aluminum hydroxide in compound powder

doi:10.16265/j.cnki.issn1003-3033.2020.01.017

Abstract

Abstract: In order to develop efficient dry powder extinguishing agents, a novel compound powder extinguisher was prepared with ultra-fine ABC dry powder as base material and aluminum hydroxide as additive. Then, through experiments, its suppression efficiency and inhibition effects on toxic gases were measured at different mass fraction of aluminum hydroxide. The results show that as mass fraction of aluminum hydroxide rises from 0 to 10%, drop rates of temperature and flame height both increase first and then decrease while minimum extinguishing concentration (MEC) and extinguishing time decrease first and then increase. Fire-extinguishing effect and toxic gas suppression performance would be the best when mass fraction reaches 4%. Furthermore, thermogravimetric (TG) analysis results demonstrate that aluminum hydroxide can enhance thermal decomposition rate of compound ultra-fine dry powder, resulting in better fire-fighting efficiency.

Key words: compound dry powder, aluminum hydroxide, optimal mass fraction, suppression effect, toxic gas, pyrolysis characteristic

CLC Number:

X932

LI Hangchen, GUO Xinxin, LI Shunchao, ZHANG Han, HUA Min, PAN Xuhai. Study on optimum mass fraction of aluminum hydroxide in compound powder[J]. China Safety Science Journal, 2020, 30(1): 107-113.

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