煤氧化过程中气体的形成特征与煤自燃指标气体选择

CHARACTERISTICS OF GASES PRODUCED IN PROCESS OF COAL OXIDATION AND THEIR RELATIONS WITH SELECTION OF GAS MARKERS FOR PREDICTION OF SPONTANEOUS COMBUSTION

利用氧化模拟实验和色谱分析，结合煤岩学分析，对不同性质煤样在氧化模拟实验过程中生成气体的组成和数量进行了详细分析，提出生成气体的组成和数量在内因上主要取决于煤温、煤阶和显微组分组成３个主要因素。将煤自燃指标气体分为三类，建立各类指标气体与煤温、煤阶、煤岩类型之间的数量关系。煤自燃指标气体产率随煤温上升基本上呈指数上升，但煤自燃指标气体产率与煤温相关关系曲线型式受控于煤阶和显微组分组成。不同煤阶煤应采用不同类型的煤自燃指标气体，第一类指标气体主要适用于低变质褐煤和长焰煤阶段，而第二、第三类指标气体主要适用于高、中挥发分烟煤阶段，根据指标气体与煤温相关关系以及指标气体的选择原则，分析了平庄古山矿和枣庄柴里矿煤自燃指标气体应用实践。

Compositions and quantity of gases produced by different coal samples were analyzed by simulation test in the lab, gas chromatography and petrography. It is found that they are related to three major factors, i. e. temperature, rank and macerals of coal. The gas markers for prediction of spontaneous combustion fall into three categories, and the quantitative relations between gas markers and temperature, rank and macerals of coal are established. The yield of gas markers increases exponentially with the rise of coal temperature. However,the shape of the curve is controlled by rank and macerals of coal. Different gas markers will be introduced for different rank of coals. Group Ⅰ is mainly suit able for low rank lignite and long flame coal, and Group Ⅱ and Ⅲ for bituminous coal with high and medium volatile matter. Based on the correlation between gas markers and coal temperature, and the principles for selecting gas markers, the proneness of spontaneous combustion of Gushan Mine in Pingzhuang and Chaili Mine in Zaozhuang are predicted by gas markers.