蒙西侏罗纪煤层自燃机理参数测定分析研究
Determination and Analysis of Spontaneous Combustion Mechanism Parameters of Western Inner Mongolia Jurassic Coal Seam
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摘要: 为了准确分析我国蒙西地区煤层自燃机理、剖析煤炭自燃微观特性,采用煤的工业分析、静态吸氧量以及程序升温实验方法,研究煤中水分、挥发分、灰分、耗氧量、煤质有机气体等生成速率对煤层自燃倾向特性的影响规律。与石炭纪煤样对比表明:侏罗纪煤层自燃倾向性与煤样中的水分、挥发分含量呈正相关,而与灰分含量呈负相关;侏罗纪煤样静态吸氧量均超过0.70 cm3/g,且高于石炭纪煤样;约130 ℃处始,侏罗纪煤样CO、CO2生成速率分别为0.08、0.1 t/℃,CH4来源于煤体本身,温度升高至120 ℃生成C2H6气体、150 ℃时生成C2H4气体,低温氧化阶段蒙西侏罗纪煤氧化复合作用更加剧烈。Abstract: To accurately analyze the spontaneous combustion mechanism of coal seams in western Inner Mongolia area of China and the microscopic characteristics of coal spontaneous combustion, Jurassic experimental coal samples and Carboniferous comparative coal samples were selected to reveal the moisture in coal through industrial analysis of coal, static oxygen uptake and temperature programmed experiments. The influence of water, volatiles, ash, oxygen consumption and coal organic gas generation rate on coal spontaneous combustion tendency was studied. After measuring and finishing, it is known that the spontaneous combustion tendency of the Jurassic coal seam is positively correlated with the moisture and volatile matter content in the coal sample, but negatively correlated with the ash content. The static oxygen uptake of Jurassic coal samples exceeded 0.70 cm3/g and was higher than that of Carboniferous coal samples. At about 130 °C, the formation rates of CO and CO2 in Jurassic coal samples were 0.08 t/°C and 0.1 t/°C, CH4 is derived from the coal body itself, and the temperature rises to 120 °C to generate C2H6, and 150 °C precipitates C2H4. It indicates that the oxidation of the western Inner Mongolia Jurassic coal in the low-temperature oxidation stage is more severe.
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