乌达煤田煤层自燃内因分析与自燃类型划分

Analysis of spontaneous combustion internal factors and division of spontaneous combustion types of coal seam in Wuda coalfield,Inner Mongolia

采用野外地质调查、测试分析和数据处理等综合手段,研究内蒙古乌达煤田煤层自然发火的内因条件,揭示了煤层自燃趋向性与煤层厚度、煤变质程度、灰分含量、发热量、硫含量、硫化物矿物以及有机显微组分含量等煤物质组成要素之间的关系.以煤测试统计分析数据的聚类分析结果为依据,从内因条件控制角度,将乌达煤田主要发火煤层划分为三大类:以高硫含量和富硫化物矿物为特征的高硫助燃类型;以煤层厚度大和低变质程度为特征的厚层氧化类型;过渡类型.

The methods of field geology investigation, testing and data processing were adopted to study the internal control conditions of coal spontaneous combustion in Wuda coalfield, Inner Mongolia.The relationship between spontaneous combustion tendency of coal seam and some matter composition factors of coal, such as coal seam thickness, coal metamorphic degree, ash content, heating value, sulfur content, sulfide mineral content, maceral content and so on, were analyzed.Based on the cluster analysis results of testing and statistical data of coal, three spontaneous combustion types of coal seam in study area were identified from the viewpoint of internal factor control.They are: high-sulfur combustion-supporting type characterized by large sulfur content and large sulfide mineral content; thick-layer apt to oxidation type characterized by large thickness of coal seam and low metamorphic degree, and transition type.