KHCO3粉体与典型气体灭火剂的协同灭火

为改进粉体灭火技术,探究惰性气体与粉体之间的协同灭火机理,选用碱金属化合物KHCO3超细粉体为研究对象,基于杯式燃烧器装置开展气固协同灭火实验,实验结果表明:KHCO3超细粉体熄灭甲烷火的临界灭火浓度为7.74 g/m3,在CO2、N2、He、Ar作用下,KHCO3超细粉体的灭火性能得到提高,分别在气体体积分数为13％...

Coordinated Extinguishing of KHCO3 Powder with Typical Gas Extinguishing Agent

In order to improve powder fire extinguishing technology and explore the cooperative fire extinguishing mechanism between inert gas and powder, the alkali metal compound KHCO3 ultra-fine powder was selected as the research object, and the gas-solid cooperative fire extinguishing experiment was carried out based on the cup burner device. The experimental results show that: the minimum extinguishing concentration of KHCO3 ultra-fine powder is 7.74 g/m3. Under the action of CO2, N2, He and Ar, the fire-extinguishing efficiency of KHCO3 ultra-fine powder is improved, and the positive synergistic effect peaks are reached at the gas concentration of 13%, 20%, 10% and 18% with the synergistic factors were 0.84, 0.85, 0.88 and 0.74, respectively. CHEMKIN was used to analyze the influence of Ar volume fraction on free radical concentration under different concentrations of KHCO3. The results showed that: the combined action of Ar and KHCO3 powder could significantly reduce the concentration of H and OH free radicals in flame, and the inhibitory effect increased with the increase of Ar concentration, which had a significant synergistic effect.