神东北部矿区水浸煤自燃标志性气体产生规律
Production Laws of Mark Gases for Spontaneous Combustion of Water-soaked Coal in Northern Shendong Mining Areas
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摘要: 采用煤自燃氧化程序升温实验，对水浸煤自燃标志气体产生规律进行了研究，对比分析了不同含水率水浸煤与原煤CO产生率、CO2产生率、CH4产生率、C2H4浓度、C2H6浓度、耗氧速率随温度的变化规律，发现在低温氧化阶段，水浸煤中水分的存在降低了原煤开始快速氧化的温度点，对煤自燃具有促进作用，水浸煤CO和CO2气体产生率、耗氧速率高于原煤；在快速氧化阶段，水浸煤中水分的蒸发对煤自燃具有阻碍作用，水浸煤CO和CO2气体产生率、耗氧速率低于原煤；在加速氧化阶段和高速氧化阶段，水浸煤中的水分与煤分子官能团结合生成含水络合物，提高了CO和CO2气体产生率，以及耗氧速率，同时阻止烷烃和烯烃类气体的产生，降低了C2H4和C2H6气体浓度；在煤自燃氧化过程中，水浸煤中水分的存在，降低原煤中CH4气体吸附量，水浸煤CH4产生率低于原煤。结果表明，含水率对煤自燃氧化过程中的标志性气体产生规律具有明显的影响，经水浸泡的神东北部矿区12煤比其原煤更容易氧化自燃。Abstract: Temperature programming experiment of coal spontaneous combustion and oxidation were used to study the laws of spontaneous combustion mark gas of water-soaked coal. The generation rate of CO, CO2, CH4 and concentration of C2H4, C2H6 and oxygen consumption rate were studied between different rates of water content of water-soaked coal and raw coal samples. It is found that in the stage of low temperature oxidation, the existence of water in the water-soaked coal reduces the temperature point of rapid oxidation and promotes the spontaneous combustion of coal. The production rate of CO and CO2 and the oxygen consumption rate of the water-soaked coal are higher than that of raw coal samples. In the fast oxidation stage, the evaporation of water in the coal water has an obstructive effect on the spontaneous combustion of coal. The rate of CO and CO2 gas production and oxygen consumption of the coal are lower than that of raw coal samples. In the accelerated oxidation stage and the high speed oxidation stage, the moisture of the water-soaked coal is combined with the functional group of coal molecular to produce a hydrous complex, which improves the production rate of CO and CO2 gas and the rate of oxygen consumption, and prevents the production of alkane and olefin and reduces the concentration of C2H4 and C2H6. In the oxidation process of coal spontaneous combustion, the presence of moisture in the water-soaked coal reduces the adsorption capacity of CH4 in raw coal samples, and CH4 production rate of water-soaked coal is lower than that of raw coal samples. The results show that the water content has an obvious influence on the laws of spontaneous combustion mark gas in the process of spontaneous combustion and oxidation of coal. The 12# coal soaked in water in northern Shendong Mining Area is more easily oxidized and spontaneous combustion than its raw coal.
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