老公营子井田煤层煤质特征

为合理利用老公营子井田煤,基于老公营子井田的地质概况、含煤地层的沉积旋回及煤的物化性质,对井田煤的煤质特征进行工业分析,分析煤的化学组分含量与煤层埋深的关系,确定煤的工业性能和用途。结果表明,井田煤的宏观煤岩组分以亮煤和暗煤为主,显微煤岩组分以镜质组为主。原煤化学组分含量在煤层埋深200~350 m内变化较明显,而后随着埋深的增加,变化波动较稳定,其中水分平均6.09%~10.28%,灰分平均16.93%~25.80%,硫分平均0.78%~1.47%,挥发分平均大于37%,其他稀散元素及放射性元素含量少,属于中灰、中硫型煤。根据全区平均空气干燥基高位发热量、恒湿无灰基高位发热量以及透光率,确定本井田煤属于中低发热量的2号褐煤。由于井田煤为中低发热量、热稳定性较差且与CO_2化学反应性好、焦油产率中等煤样,可作为动力用煤、气化用煤和炼油用煤原料,经济价值较大。

Coal quality characteristics of coal seam in Laogongyingzi mine field

In order to make economical utilization of the coal in Laogongyingzi mine field,this paper studied the coal quality characteristics based on the geologic profile,the sedimentary cycle of coal-bearing strata and the physical and chemical properties of coal.And the relationship between the chemical composition of coal and the depth of coal seam was analyzed to determine the industrial properties and the use of coal.The results show that the lithotypes of the coal is dominated by clarain and durain;and the coal maceral is mainly composed of vitrinite.The content of chemical components in coal seam is more obvious than that in coal seam with depth of 200-350 m,and it is more stable with the increase of burial depth.The average internal moisture content of raw coal is approximately 6.09％-10.28％,the average ash content is ca.16.93％-25.80％;and the average sulphur content is ca.0.78％-1.47％,as well the average volatile content is more than 37％;while,the contents of other elements are low.Obviously,the coal is with medium ash and sulphur contents.According to quality evaluation method,i.e.,the region's average gross calorific value,constant humidity gross calorific value,transmittancy etc.,the coal belongs to a medium-low calorific value of No.2 lignite.Because of its medium-low calorific value,poor thermal stability,high chemical reactivity with CO2 and medium tar yield,the coal can be used as a raw material for steam coal,gasification coal and coking coal;and thus it can have a greater economic value.