ABSTRACT

The water molecules associated with coal play a significant role in spontaneous ignition and combustion of coal. This paper deals with studies to evaluate the impact of moisture content on crossing point temperature (CPT) and ignition point temperature (IPT) of some low-rank coal and lignite after various stages of drying. Experimental data suggest (i) existence of critical moisture content value determining the propensity of a particular coal toward self-heating and (ii) content of moisture and nature of oxygen-bearing functional groups to be the most influencing factors in self-heating. The auto-oxidation cum self-heating characteristics of coal become more conducive with increase in the ratio of quantity of hydroxyl to carboxyl functional groups. The FTIR studies further corroborate that the initial stages of auto-oxidation cum self-heating occur presumably at the surface of the coal.

摘要

与煤结合的水分子在煤的自燃和燃烧中起重要作用。本文涉及评估水分含量对一些低阶煤和褐煤在不同干燥阶段后的交叉点温度 (CPT) 和着火点温度 (IPT) 影响的研究。实验数据表明（i）存在决定特定煤自热倾向的临界水分含量值和（ii）水分含量和含氧官能团的性质是自热的最大影响因素。随着羟基与羧基官能团数量比例的增加，煤的自氧化和自热特性变得更有利于煤的自氧化和自热特性。