中变质煤结构演化的FT-IR分析

FT-IR study on structure evolution of middle maturate coals

选择5种有代表性的炼焦用煤,分属不同地方不同煤种的中等变质程度煤,在实验室条件下利用美国生产的FTS-165傅立叶变换红外光谱仪对其进行FT-IR分析,采用WIN-IR软件中的谱图解叠子程序针对煤特有的结构性质进行研究。结果表明:煤中存在5种类型的羟基,其与氧碳原子比(O/C)的关系较为复杂;随着煤中氧含量的减少,碳含量的增高,煤中各类脂肪类物质增加,在肥煤阶段达到最大然后减少;煤中含氧官能团的变化趋势为稳定的官能团具有增大的特征,而不稳定的则减少;在肥煤阶段其芳香烃碳—碳双键强度减小,然后又增大;提出在肥煤阶段煤化作用跃变是由于脂肪侧链和芳香体系相互竞争的结果。

Based on five representative coking-coal for different coal types from different place,FTS-165 Fourier transform infrared spectrometer made in America under laboratory conditions and procedure of curve resolution from WIN-IR ware was used to study the endemic coal structure.The results show that there are five types of hydroxyl in the coal structure,which has complex relations with oxygen/carbon atomic ratio（O/C）.With the decrease of oxygen and increase of carbon,content of lipoid material becomes higher till to fat-coal stage,and then lower.It is showed an increase tendency in stable functional groups and decrease tendency in unstable groups;at fat-coal stage,C-C strength of aromatic hydrocarbon decreased,and then increased.Coalification jump at fat-coal stage is the mutual competition for aliphatic side chains with aromatic system.