摘要
为研究密闭火区高温煤体在注气灭火过程中的降温及自燃抑制效应,将理论分析与实验相结合,分析密闭火区空气中的O2质量分数变化原因,建立O2质量守恒动态模型,得到高温煤体在注气过程中的降温特征及CO衰减规律。结果表明:高温煤体在注气初期出现降温滞后现象;注入CO2气体及N2时,煤样CO消失的温度分别为74和58℃;注入含氧10%的CO2混合气时,CO在38℃消失;注入含氧10%的N2混合气时,CO持续存在;实验证明CO2灭火效果优于N2。
Aim to study the effects of cooling and inhibition in enclosure fire zone under injected inert gas,combined the theoretical analysis with experiment, analyzed the reasons of the oxygen mass fraction changes,established the kinematic mathematical model of oxygen mass fraction, and obtained the characteristics of the cooling and the carbon monoxide attenuation. The results showed： the cooling delay phenomenon existed in the initial stage under injected inert gas, the carbon monoxide respectively vanished at 74 ℃ and 58 ℃under injected carbon dioxide and nitrogen, the carbon monoxide vanished at 38 ℃ during injected the mixture of carbon dioxide which contained 10% oxygen, and the carbon monoxide continue existed during injected the mixture of nitrogen which contained 10% oxygen. Carbon dioxide was superior to nitrogen in the effects of outfire by the experiment.
出处
《中国安全科学学报》
CAS
CSCD
北大核心
2016年第3期64-70,共7页
China Safety Science Journal
基金
国家自然科学基金资助(U1361205
51404090
51574111)
煤矿灾害动力学与控制国家重点实验室自主研究课题重点项目(2011DA105287*ZD201401)
关键词
自燃火区
惰气灭火
降温滞后
O2质量分数
气体衰减
spontaneous combustion area
inert gas extinguishing
cooling delay
oxygen mass fraction
gas attenuation
