我国褐煤资源及其物性特征

为给研究褐煤对水和甲烷的吸附性及水和甲烷在褐煤中的流动性提供依据,对采自我国主要褐煤产地的13个样进行了煤岩组分、工业分析及褐煤物性特征测试。结果表明：褐煤中的全水分、空气干燥基水分、挥发分含量随变质程度的增加而减少;当镜质组最大反射率Ro,max〈0.35%,褐煤孔隙度随变质程度的增加而减少,当Ro,max〉0.35%随变质程度的增加而增大;各煤样孔容、比表面积差别很大,但大孔、中孔、过渡孔、微孔孔容分布较均匀,比表面积集中分布在过渡孔和微孔中;褐煤对甲烷的饱和吸附量平均为6.27 m3/t。研究成果对褐煤中次烟煤的划分、褐煤的提质利用及褐煤中煤层气资源的开发具有指导作用。

China Lignite Resources and Physical Features

In order to provide the basis to the study on the water and methane adsorption of lignite and the water and methane flowability of lignite,the tests of the coal and rock composition,proximate analysis and lignite physical features were conducted on 13 coal samples from main lignite production places in China.The results showed that the total moisture,air dry base moisture and volatile matter content of the lignite would be reduced with the metamorphic degree increased.When Ro,max was over 0.35%,the porosity of the lignite would be reduced with metamorphic degree increased.When Ro,max was less than 0.35%,the porosity of the lignite would be increased with metamorphic degree increased.The pore volume and specific surface area of each coal sample would be high in difference.The pore volume distribution of the large pore,medium pore,transition pore and micro pore would be homogeneous and the specific surface area was concentrated and distributed in the transition pore and the micro pore.The average methane saturated adsorption of lignite was 6.27 m3/t.The study achievements would have the guidance role to the sub-bituminous coal grading in the lignite,the upgrading and utilization of the lignite and the development of coal bed methane resources in lignite.