Zuoyun Donggucheng Coal Industry Co., Ltd., Shanxi Coal Import and Export Group

针对东古城煤矿煤自燃预测预报问题,通过煤自燃程序升温实验在不同氧浓度下得到了东古城褐煤自燃时的气体产物及其特性规律,并根据实验结果提出了煤自燃预测预报的指标气体及参数。结果表明:氧气浓度一定时,随着温度的升高,CO浓度在200℃前基本呈指数函数递增,CO2和CH4浓度整体上呈指数函数递增。C2H4气体浓度先快速增大,后缓慢增加,而后又快速增大。CO/CO2与C2H4/CH4比值变化情况相似,均为先增大后减小,曲线拐点对应温度均在180℃左右。根据实验结果,选择CO和C2H4作为预测东古城煤矿褐煤自然发火的单一指标气体,CO预警浓度设为(30~70)×10-6,C2H4预警浓度设为(1~1.6)×10-6,同时以CO/CO2比值和C2H4/CH4比值作为判断煤温的辅助指标。研究结果可为东古城煤矿煤自燃预测预报提供一定的依据。

Aiming at the problem of prediction and forecasting of coal spontaneous combustion in Donggucheng Coal Mine, gas products and their characteristic laws during the spontaneous combustion of Donggucheng lignite are obtained through coal spontaneous combustion programmed temperature rise experiments under different oxygen concentrations. According to the experimental results, indicator gases and parameters of coal spontaneous combustion prediction and forecasting are proposed. The results show that when the oxygen concentration is constant, with the increase of temperature, the CO concentration basically exhibits exponential function increasing before 200 ℃, and the concentrations of CO and CH exhibit exponential function increasing as a whole. The concentration of CH gas first increases rapidly, then slowly increases, and then rapidly increases again. The ratio change situations of the CO/CO and CH/CH are similar, both increasing first and then decreasing, with the inflection points of the curves corresponding to temperatures around 180 ℃. According to the experimental results, CO and CH are selected as the single indicator gases for predicting the spontaneous combustion of lignite in Donggucheng Coal Mine. The CO early warning concentration is set to (30-70) × 10, and the CH early warning concentration is set to (1-1.6) × 10. At the same time, the CO/CO ratio and the CH/CH ratio are used as auxiliary indicators for judging coal temperature. The research results can provide a certain basis for predicting and forecasting coal spontaneous combustion in Donggucheng Coal Mine.