煤炭自燃指标性气体确定的实验研究

Experimental studies on the index gases of spontaneous of coal

矿井火灾是矿井五大灾害之一,煤炭自燃则是矿井火灾最主要的起因。为了了解煤炭氧化、自燃规律,本文采用TG-DSC技术研究了不同煤种在水分蒸发、吸氧增重、受热分解及燃烧等不同氧化阶段的氧化特征值;并采用TG-DSC-GC联用技术研究了不同煤种在整个氧化阶段的气体产物生成规律及其特征。在煤的低温氧化阶段,找出了CO等可作为判别煤自燃的指标性气体及C2H4等辅助指标性气体;并得出了各煤种氧化阶段的耗氧规律。

Coal mine fire is a common accident,and spontaneous combustion is the major cause of fire.Thermo-gravimetry（TG）and Differential Scanning Calorimetry（DSC）technologies were used to study the coal oxidation process.The whole process can be divided in to 5 stages：moisture evaporation stage,oxygen absorption stage,thermal decomposition stage,combustion stage and burnout stage.The oxidation characteristic values of each stage were analyzed in order to find out the oxidation and spontaneous combustion pattern;TG and DSC combined with Gas Chromatography（GC）technologies were used to study the gas production pattern in the whole oxidation process of different coal.According to the study results,carbon monoxide（CO）can be used as the main index gas for the prediction of coal spontaneous combustion in the low temperature stage,and ethene（C2H4）can be used as the subsidiary one.Finally,the pattern of oxygen demand at oxidation process was proposed.