伊犁干沟矿区煤氧化微观特性研究

    Study on microscopic characteristics of coal oxidation in Yili Gangou Mining Area

    • 摘要: 为研究伊犁干沟矿区煤氧化特性,首先采用热重方法(TG)对伊犁干沟矿区不同粒径煤样进行分析,得到不同特征温度,并对不同阶段(室温~T2段、T2T5段、T5T6段、T6T8段)活化能进行计算;借助傅里叶原位红外光谱法(FTIR)对不同粒径煤样的官能团变化特征进行分析,对不同谱段的红外光谱进行分峰拟合,计算不同粒径各煤样官能团峰面积及峰面积占比变化。研究结果表明:随着煤样粒径减小,各特征温度变化不大;室温~T2段活化能随着粒径的减小呈现波动变化趋势,T5T6段活化能随着粒径减小呈现为先增大后减小的变化趋势,T2T5段、T6T8段活化能随着煤样粒径减小,呈现减小趋势,80~96 μm粒径的煤样在室温~T2段、T2T6段、T6T8段活化能最小,其反应更激烈;随着煤样粒径减小,各官能团的吸光度变大,煤分子中羟基相对稳定,脂肪族各基团中亚甲基有较高的反应活性,含氧官能团中酚羟基C—O伸缩振动占比最大,芳香烃的苯环二取代逐渐消失。

       

      Abstract: In order to study the coal oxidation characteristics of Yili Gangou Mining Area, the coal samples with different particle sizes in Yili Gangou Mining Area are analyzed by thermogravimetry(TG), different characteristic temperatures are obtained, and to calculate the activation energy of different stages(room temperature-T2 stage, T2-T5 stage, T5-T6 stage, T6-T8 stage).With the help of FTIR, the characteristics of functional group changes in coal samples of different particle sizes are analyzed, the infrared spectra of different spectral bands are fitted by peak sub-peaks, and the peak area and peak area ratio changes of functional groups of coal samples with different particle sizes are calculated, and the infrared spectra of different stages are peak-fitted, and the peak area and ratio changes of the functional groups of coal samples of different particle sizes are calculated.The research results show that with the decrease of coal sample particle size, each characteristic temperature point basically changes little; with the decrease of particle size, the room temperature-T2 stage activation energy shows a fluctuating trend, and T5-T6 stage increases first and then decreases, the activation energy of T2-T5 stage and T6-T8 stage show a decreasing trend and coal samples with a particle size of 80-96 μm have the smallest activation energy at room temperature-T2 stage, T2-T6 stage, and T6-T8 stage, and the reaction is more intense; as the particle size of the coal sample decreases, the absorbance of all functional group increases, the hydroxyl group in the coal molecule is relatively stable, the methylene group in the aliphatic groups has higher reactivity, and the oxygen-containing functional group has the largest proportion of phenolic hydroxyl C—O stretching vibration.The disubstituted benzene ring of aromatic hydrocarbons gradually disappeared.

       

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