煤田火区灾害气体致灾机理  

Gas Disaster- causing Mechanism of Coalfield Fire Area

作　　者：宋双林[1,2,3] 

机构地区：[1]煤科集团沈阳研究院有限公司,辽宁沈阳110016 [2]煤矿安全技术国家重点实验室,辽宁沈阳110016 [3]大连理工大学,辽宁大连116024

出　　处：《煤矿安全》2015年第1期130-132,136,共4页Safety in Coal Mines

基　　金：国家重大科学仪器设备开发专项资助项目(2012YQ240127);国家科技支撑计划资助项目(2012BAK04B05)

摘　　要：深入了解煤田火区火灾气体侵入井下工作面的作用机制对于保证井下工作面安全回采有重要意义。以乌海矿区一受上覆火区影响的典型工作面为研究对象,考虑地形地貌、地表风向风速、昼夜温差、大气压力变化、地层裂隙及火风压对井下通风系统的影响,采用CFD方法研究了煤田火区与工作面之间的气体流动规律,得到了如下结论:过大的通风静压不利于煤自燃防治工作;可将CO2气体作为上覆火区气体侵入井下工作面的预警指标;煤田火区与工作面之间的压能差是煤田火区与工作面间气体流动的根本原因。The mechanism was understood in- depth that coalfield fire area gas invaded into underground working face,which had important significance to ensure the mining safety of underground working face. Taking the typical working face affected by the overlying coalfield fire area of Wuhai mining area as the research object,some influence factors for underground ventilation system were considered,such as topography,surface wind speed,temperature difference between day and night,changes in atmospheric pressure,formation fracture and fire- blow pressure. The CFD method was used to study the gas flow regularity between coalfield fire area and working face,the results showed that excessive air static pressure was not conducive to the prevention and control work of coal spontaneous combustion; CO2 could be considered as the early warning indicator of overlying fire area gas invading into underground working face; the air pressure difference between coalfield fire area and working face was the root cause of gas flow.

关 键 词：煤田火区 致灾机理 CFD模拟 自然发火 超前预警 

分 类 号：TD752.2[矿业工程—矿井通风与安全]