摘要
为了研究木材的支护煤层发生瓦斯爆炸后引起次生火灾的危险性,进行了瓦斯爆炸情形下支护木材次生火灾的发生机理的分析和研究。对包括不同初始浓度和体积的瓦斯爆炸火焰波的特性、爆炸后爆源临近区域的动态热环境进行了分析和研究。基于对爆炸后热环境的分析,应用快速热裂解仪开展了支护木材的快速热裂解实验,实验选取温度处于592～1 313 K,热作用持续时间分别为1,2,5,10 s。结合燃烧学基础理论,分别从可燃物、燃烧浓度极限、最低助燃氧浓度、感应期4个方面对瓦斯爆炸热环境下支护木材的起火可能性进行了分析和判定。得出,如果木材支护的煤层发生初始瓦斯浓度处于5.0%～9.25%之间的某个体积的瓦斯爆炸,则在爆炸后距爆源一定距离范围内就构成了引发支护木材着火的必要条件,就有瓦斯爆炸引起了支护木材次生火灾的可能。
The risk of fire induced by methane explosions on supporting wood in coal seam was studied by doing research on the mechanism of it.The thermal environment of methane explosions which include the characteristics of fire wave and the temporal and spatial thermal environment was studied.Based on the research of thermal environment,the fast pyrolysis of supporting wood was carried out by using fast pyrolysis apparatus.The experiment temperature was from 592~1 313 K,and the duration time of heating were 1,2,5,10 s.Connected with combustion theory,the possibility of fire induced by methane explosions was discussed from the following aspects：fuel,combustion limit,the minimum combustion oxygen limit,and fire period.If the initial methane concentration is between 5.0%~9.25%,then the sub-fire may occur in a certain distance from explosion source.
出处
《煤炭学报》
EI
CAS
CSCD
北大核心
2012年第3期477-483,共7页
Journal of China Coal Society
基金
国家重点基础研究发展计划(973)资助项目(2005CB221500)
国家"十一五"科技支持计划资助项目(2006BAK03B05)
关键词
瓦斯
爆炸
支护木材
起火
methane
explosions
supporting wood
sub-fire
