KHCO_(3)粉体与典型气体灭火剂的协同灭火  

Coordinated Extinguishing of KHCO_(3) Powder with Typical Gas Extinguishing Agent

作　　者：梁天水[1] 张俊格 林争雄 毛思远 张华杰[1] LIANG Tian-shui;ZHANG Jun-ge;LIN Zheng-xiong;MAO Si-yuan;ZHANG Hua-jie(School of Mechanics and Safety Engineering,Zhengzhou University,Zhengzhou 450001,China)

机构地区：[1]郑州大学力学与安全工程学院,郑州450001

出　　处：《科学技术与工程》2022年第11期4654-4659,共6页Science Technology and Engineering

基　　金：国家自然科学基金(51874258);高等学校青年骨干教师培养计划(2018GGJS002)。

摘　　要：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KHCO_(3)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:KHCO_(3)超细粉体熄灭甲烷火的临界灭火浓度为7.74 g/m^(3),在CO_(2)、N_(2)、He、Ar作用下,KHCO_(3)超细粉体的灭火性能得到提高,分别在气体体积分数为13%、20%、10%、18%处达到正协同效应的峰值,协同因子分别为0.84、0.85、0.88、0.74。结合CHEMKIN软件分析在不同浓度KHCO_(3)条件下,Ar体积分数对自由基浓度变化的影响,结果表明,Ar与KHCO_(3)粉体共同作用能够显著降低火焰中H和OH自由基浓度,且抑制效果随Ar浓度的增加而增加,具有较为显著的协同效果。In order to improve powder fire extinguishing technology and explore the cooperative fire extinguishing mechanism between inert gas and powder,the alkali metal compound KHCO_(3) 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 as follows.The minimum extinguishing concentration of KHCO_(3) ultra-fine powder is 7.74 g/m^(3).Under the action of CO_(2),N_(2),He and Ar,the fire-extinguishing efficiency of KHCO_(3) 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 KHCO_(3).The results show these as follows.The combined action of Ar and KHCO_(3) 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.

关 键 词：杯式燃烧器 协同 自由基浓度 CHEMKIN软件 

分 类 号：X932[环境科学与工程—安全科学]