褐煤常温下快速氧化微观机理研究

发布时间：2018-04-28 18:58

本文选题：褐煤 + 常温氧化　；参考：《辽宁工程技术大学》2015年硕士论文

【摘要】：本论文主要讨论褐煤在常温下发生自然氧化的问题,针对褐煤煤质发生变化的原因和分子结构变化的规律进行研究,通过褐煤的热重分析实验,讨论了煤样自然发火的特征温度和反应活化能,分析了煤样的自然发火倾向性；根据煤低温氧化动力学计算获得了开采煤层的自然发火期指标。使用温度设定——远红外光谱实验研究煤层自燃的典型低温氧化气体产物生成过程中温度和浓度的特点,建立了标志性气体生成量与温度的关系,另外通过煤的傅里叶变换红外光谱分析可知,随着变质程度的增加,煤分子结构比例的脂肪烃和环烷醇、酚羟基也下降,芳环的结构化程度的比例很高。从而得出褐煤内部的分子结构存在的活性官能团比其它煤样的活性官能团要多,所以才能在常温下更能发生快速的氧化反应的问题。
[Abstract]:This paper mainly discusses the natural oxidation of lignite at room temperature, studies the cause of coal quality change and the rule of molecular structure change, and carries on the thermogravimetric analysis experiment of lignite. The characteristic temperature and reaction activation energy of coal sample spontaneous combustion are discussed, and the spontaneous combustion tendency of coal sample is analyzed, and the index of spontaneous combustion period of coal seam is obtained according to the calculation of coal oxidation kinetics at low temperature. The characteristics of temperature and concentration during the formation of typical low-temperature oxidized gas products from spontaneous combustion of coal seam were studied by temperature-setting far-infrared spectroscopy, and the relationship between the amount of iconic gas production and temperature was established. In addition, with the increase of the degree of metamorphism, the proportion of fatty hydrocarbons and naphthenic alcohols and phenolic hydroxyl groups also decrease with the increase of the degree of metamorphism, and the proportion of the structure degree of aromatic rings is very high. It is concluded that there are more active functional groups in the molecular structure of lignite than those in other coal samples, so that the rapid oxidation reaction can take place at room temperature.
【学位授予单位】：辽宁工程技术大学
【学位级别】：硕士
【学位授予年份】：2015
【分类号】：TD752.2

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