复合干粉中氢氧化铝的最佳质量分数研究

Study on optimum mass fraction of aluminum hydroxide in compound powder

为开发高效干粉灭火剂,以超细ABC干粉为基料、氢氧化铝为添加剂,制备一种新型复合干粉灭火剂。通过灭火试验,测定含有不同质量分数氢氧化铝的复合超细干粉的灭火效能和对火焰烟气中有毒气体的抑制效能。结果显示,随着复合超细干粉中氢氧化铝质量分数从0%增加到10%,火焰温度下降速率和火焰高度下降率均呈现先上升后下降的趋势,而灭火剂最小灭火浓度(MEC)和灭火时间则先减小后增大;当氢氧化铝质量分数为4%时,灭火效能和抑烟性能最佳。热重(TG)分析结果表明:氢氧化铝可以加快复合超细干粉的热分解速率峰值,从而提升灭火效能。

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.