中文摘要：

采用红外光谱法确定褐煤中含氧官能团的种类,利用化学法分析干燥前后褐煤表面含氧官能团的变化,吸水性能用最高内在水分来表征,研究低温干燥过程中温度、干燥程度和干燥气氛对褐煤含氧基团及其吸水性能的影响.结果表明,褐煤中羧基和酚羟基含量较高;惰性气氛低温干燥时,酚羟基含量基本不变,羧基发生少量分解;空气下干燥时,羧基含量先减小,之后在氧化作用下,羧基和酚羟基含量同时增大.随着干燥程度的加深,煤样最高内在水分先减小后增大.

英文摘要：

To study the effect of temperature, drying degree and atmosphere on lignite oxygen-containing functional group and moisture absorption during low-temperature drying, the type and content of oxygen-containing functional group was determined by IR and chemical titra- tion, and moisture absorption characterized by moisture holding capacity. The results showed that the content of carboxyl and phenolic hydroxyl were high in lignite. Phenolic hydroxyl content kept constant, and a small amount of carboxyl decomposed during low-temperature drying at an inert atmosphere. While, when drying at air atmosphere, the content of carboxyl and phenolic hydroxyl increased in consequence of oxidation. With the deepening of drying, MHC of lignite decreased and then increased.