采用交叉点温度法对启封煤易复燃问题的研究  

Study on Easy Spontaneous Combustion Problem of Unsealed Coal With Crossing Point Temperature Method

作　　者：陆伟[1,2] 李金亮 杨兴兵 

机构地区：[1]瓦斯灾害监控与应急技术国家重点实验室,重庆400037 [2]中煤科工集团重庆研究院有限公司,重庆400037

出　　处：《煤矿安全》2013年第12期230-233,共4页Safety in Coal Mines

基　　金：国家自然科学基金资助项目(50804022);重庆市基础与前沿研究计划杰青资助项目(cstc2013jcyjjq90001)

摘　　要：针对目前煤矿由于自燃发火后直接灭火无效的情况下,常采用封闭火区的方法,启封时容易发生自燃,采用交叉点温度法对其进行研究。分别采用不同质量的煤样进行试验,获得最佳煤样质量条件下的交叉点温度,采用不同的氧化温度对煤样进行初次氧化后降温,然后再次氧化考察交叉点温度变化情况。结合红外光谱分析最终得出当煤炭发生自燃之后,自燃点中心的煤样由于煤中活性基团基本反应完全,因此较难再次自燃,但是离中心点较远,受到热量影响的煤,由于煤样物理、化学条件改变,更容易传热及吸附氧气,因此更容易发生自燃。因此煤矿发生火灾而封闭的火区,启封时要特别注意距离煤自燃中心点较远位置的煤样的防护,防止其发生再次复燃。As for the situation that it is difficult to extinguish fire after spontaneous combustion in coal mine,adopting the method of sealing fire zone,but it is prone to spontaneous combustion as fire zone unsealed,so crossing point temperature method is used to study the reasons. Different quality of coal samples are tested to get crossing point temperature under best quality coal sample,and different oxidation temperatures are used to get the changes of cross point temperature after cooling for initial oxidation,and then re-oxidation.Combined with infrared analysis,it deduces that the active groups in the center of coal fire will react completely after the coal spontaneous combustion,so it is difficult to spontaneous combustion again,but,the coal that is away from the center point affected by the heat will change the physical and chemical conditions,coal samples is prone to adsorb oxygen and transfer heat,and easy to spontaneous combustion. when the sealing fire zone opened,it is important to pay special attention to the coal spontaneous combustion which is away from the coal spontaneous combustion center,to prevent the spontaneous combustion of coal.

关 键 词：交叉点温度 煤自燃 指标气体 再次氧化 红外分析 

分 类 号：TD752.2[矿业工程—矿井通风与安全]