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应用傅立叶红外光谱(FTIR)分析技术,采用计算机曲线拟合方法对红外光谱进行分峰处理,通过对自然演化系列和人工模拟实验系列样品的研究,定量分析了不同煤化程度煤的红外光谱特征。研究表明,煤的红外光谱在一定程度上可以定量表征煤化作用程度。含氧基团和烷基侧链随煤化程度的增高以不同的速度发生脱落,且脱落的速度具有明显的阶段性:羧基的减少主要发生在Rmax为0.5%之前,但可以持续到肥煤阶段;脂肪基团的脱落主要发生在沥青化作用阶段内,并导致生成大量的烃类,沥青化作用之前发生的脂肪基团的脱落是煤的未熟和低熟油形成的主要原因;在沥青化阶段之后的高演化阶段,煤中的烷基侧链已经脱落殆尽,芳环缩合程度明显提高。红外光谱的分峰技术和定量,为精细解析煤的结构特征和煤化作用研究提供了一种新的方法。
Fourier transform infrared spectroscopy (FTIR) analysis technique was used to curve the infrared spectrum by computer curve fitting method. Through the study of natural evolution series and artificial simulation experiment series samples, the infrared spectral characteristics of coal with different coalification degree were quantitatively analyzed. The research shows that the infrared spectrum of coal can quantitatively characterize the extent of coalification to a certain extent. Oxygen-containing groups and alkyl side chains with the degree of coalification at different speeds off, and the rate of shedding has obvious stage: the reduction of carboxyl mainly occurs in the Rmax is 0.5%, but can continue until the fat coal stage ; The shedding of fatty groups mainly occurs in the phase of asphaltization and leads to the generation of a large amount of hydrocarbons. The shedding of aliphatic groups before tarring is the main reason for the formation of unripe and low-mature coal; Stage after the high evolution stage, the alkyl side chains in coal have been completely exhausted, the degree of aromatic ring condensation increased significantly. FTIR spectroscopy technique and quantitative analysis provide a new method to finely analyze the structural characteristics and coalification of coal.