烟煤煤样吸附特性及控制因素试验研究  

Investigation on adsorption characteristics and their controlling factors of bituminite

作　　者：孟磊[1,2] 姜耀东[1,2] 赵毅鑫[1,2] 

机构地区：[1]中国矿业大学(北京)煤炭资源与安全开采国家重点实验室,北京100083 [2]中国矿业大学(北京)力学与建筑工程学院,北京100083

出　　处：《安全与环境学报》2014年第6期52-55,共4页Journal of Safety and Environment

基　　金：国家重点基础研究发展计划(973)项目(2010CB226801);煤炭资源与安全开采国家重点实验室开放课题(SKLCRSM13KFB10);中国博士后科学基金项目(2014M560136)

摘　　要：为了补充我国煤炭主产区华北区域主要发育煤种烟煤的吸附特性等相关参数,通过等温吸附试验得到了不同变质程度烟煤的等温吸附曲线及吸附常数,并结合煤样变质程度、微孔隙结构和煤岩成分组成,分析了影响烟煤吸附特性的因素,确定了煤岩成分是影响此区域煤样吸附特性的主控因素。结果表明:随变质程度(Ro,max)增加,VL和pL呈现指数式的增加趋势,VL相近的煤样pL的差异表征着煤样吸附瓦斯难易程度的不同;随微孔所发育比表面积减小,VL和pL均呈现微增趋势,存在的这种弱相关性表征为Ro,max-微孔比表面积曲线与Ro,max-VL和Ro,max-pL曲线的反对称关系;煤岩成分是影响此区域烟煤吸附及储集瓦斯气体能力的主要原因,一方面随固定碳质量分数增加,VL线性增加,呈现极强的正相关性,另一方面煤样水分质量分数与VL呈弱相关性,水分的存在会抑制瓦斯气体的吸附。The article is aimed at presenting our findings of the ad- sorptive particularities and their controlling factors of the bituminite samples collected from some North China mining areas, which is essential for preventing gas dynamic disaster and getting rid of the coal bed methane. For this purpose, we have made a detailed description of the gas adsorption element changing regularity of the said coal sample with the increase of adsorptive gas pressure via the isothermal adsorption experiment. At the same time, we have also worked out the impacts of the coal rank, microporous structure and coal constituent on the adsorptive features in accordance with the theory of Langmuir isothermal adsorption equation, with the adsorption parameters mainly including VL and PL. Our analysis proves that VL and PL increase ex- ponentially with the increase of the coal rank （R ） in the range of 0.81% to 1.454% . However, on the one hand, the difference of VL value of the coal samples with the adjacent VL value refers to how easily the bituminite coal sample can absorb the methane gas, on the other, we have inferred from this difference that a coal sample with a lower PL value from the coal samples with adjacent VL value tends to be more inclined to desorbing the gas than that with a higher PL value under the same gas pressure. In order to determine the microperous specific surface areas of the bituminite, we have gained such microporous parameters via the AutoPorelV9500 micropore structure determinator. The other side that we have examined over the effect of spe- cific surface area of micropore on the adsorption for the bituminite, has helped us to discover that all the adsorption parameters, including VL and PL, tend to reveal a weak increasing trend with the decrease of the specific surface area of micropore, which implies that there may exist antisymmetric correlations between the R -specific sur- face area of micropore curve and the Ro,max-adsorption parameters curves. What is more, we have made a synthesis of the influentia

关 键 词：安全工程 吸附特性 变质程度 烟煤 固定碳含量 控制因素 

分 类 号：X936[环境科学与工程—安全科学]