凤阳山矿区太原组和山西组煤质特征分析

基于煤岩测试和工业分析数据评价了凤阳山矿区太原组、山西组可采煤层煤质特征,探讨了可采煤层煤质特征与成煤环境的关系。结果表明：太原组煤层为低灰分（Ad）、低挥发分（Vdaf）、高硫分（St,d）之贫煤,山西组煤层为低灰分、低挥发分、低硫分之贫煤。从下到上煤层镜质组含量、挥发分、硫分含量降低。山西组和太原组煤层灰分含量均较低,但山西组煤层灰分含量变化较大,灰成分指数较高。山西组煤层硫成分以Sp,d、So,d为主,硫分明显低于太原组煤层。从下向上成煤环境从浅海、滨海过渡相向陆相演化,泥炭沼泽水介质也从咸水、半咸水向淡水演化,因此,相应煤层煤质特征也表现出垂直分带性。

Coal quality characteristic of Taiyuan formation and Shanxi formation in Fengyangshan mining area

According to test date of coal petrologic test and proximate analysis,this paper provides an overall coal quality in mineable coal seam of Taiyaun formation and Shanxi formation in Fengyangshan mining area. On this basis,the correlation between coal quality of mineable coal seam and coal formation environment was discussed in detail. The results show that the mineable coal seam of Taiyaun formation is lean coal which characterized by low ash yield( air dried basis),low volatile( air dried ash free basis),high sulfer( S_t,d),and that the mineable coal seam of Shanxi formation is lean coal which characterized by low ash yield( air dried basis),low volatile( air dried ash free basis),low sulfer( S_t,d). The ash content of mineable coal seam of Taiyaun formation and Shanxi formation were both low,but Changes of ash yield in Shanxi formation coal seam is obviously larger,and the coal ash composition parameter is higher. The main sulphur components in mineable coal seam of Shanxi formation are S_p,d,S_o,d,which is much lower than the components in coal seam of Taiyuan formation. It builds the coal-forming environment from the bottom up,from neritic facies,transitional facies to continental facies evolution. The Water in peat bog also evolved from salt water,brackish water to fresh water. So the relative coal quality features also showed vertical zonation.