School of Safety Science and Engineering, Xi"an Unitersity of Science and Technalogy, Xi' an 710054, China

为得到出实用性和可靠性更强的现场煤自燃早期预报方法,选取鸳鸯湖矿区典型煤样,通过煤自然发火试验获得了煤自燃过程主要指标气体的产生规律与特征参数,确定了以CO、C2H4作为主要的早期预报指标。结合CO的主要来源和工作面干扰气体浓度的因素,提出了上隅角CO浓度理论模型,并计算得出了体积分数为0.04%的极限指标,来预报采空区遗煤的氧化程度。基于鸳鸯湖矿区典型工作面回采期间上隅角CO浓度的观测数据,分析了上隅角CO浓度动态波动的主要原因以及与灌浆、注氮、提高推进度等防治措施的关联性。同时验证了建立的极限预报指标体系能够满足煤自燃早期预报的要求。

In order to obtain a practical and more reliable early prediction method of the site coal spontaneous combustion, the typical coal samples were selected from Yuanyang Lake Mining Area. With the coal spontaneous combustion experiment, the production law and feature parameters of the main index gases were obtained from the coal spontaneous combustion process, CO and C,H, were determined as the main early prediction indexes. In combination with the main sources of CO and the factors that interference gas concentration in the coal mining face,a theoretical model of CO concentration in the top corner was provided and the limit index value of volume fraction 0.04% from the calculation was applied to predict the oxidation degree of the coal left in the goaf. Based on the observed data of CO concentration in the top corner during the mining period of the typical coal mining face in Yuanyang Lake Mining Area, the main causes of CO concentra-tion dynamic fluctuation in the top corner were analyzed, including the relevance with grouting, nitrogen injection, improved advancing ate and other prevention and control measures. Meanwhile, the established limit predicted index system was confirmed could meet the early waming requirements of coal spontaneous combustion.

国家自然科学基金青年基金资助项目(51404195；51404192)；