基于氧气体积分数的高瓦斯采空区自燃“三带”的划分

Division of Spontaneous Combustion "Three-Zone" in High-Gas Goaf Based on Oxygen Concentration

用氧气体积分数法划分低瓦斯采空区自燃"三带"是目前在工程实践中应用最为广泛,也是最有效的方法。但是该方法没有考虑采空区的瓦斯体积分数的影响,在高瓦斯采空区的应用就受到了局限。根据化学动力学原理,通过理论推导,提出了基于氧气体积分数的高瓦斯采空区自燃"三带"的划分标准,并利用该标准对现场的高瓦斯采空区进行了划分。通过对采空区内遗煤温度的观测分析,验证了该划分标准的准确性,为高瓦斯矿井采空区早期自然发火预测及火区治理提供了依据。

The oxygen concentration method is the most effective and most commonly used method in dividing spontaneous combustion ＂three zone＂ in low-gas goaf in engineering practice at present.But this method cannot be directly applied to high-gas goaf,because it neglects gas concentration.Based on the principle of chemical dynamics and theoretical derivation,the division standard of the spontaneous combustion ＂three zone＂ in high-gas goaf was proposed,and spontaneous combustion ＂three zone＂ in actual high-gas goaf was divided by this standard.The result was tested and verified by measuring and analyzing the temperature of residual coal in goaf.The study provides guidance for prediction and pre-vention of spontaneous combustion in high-gas goaf.