西南典型矿区煤等温吸附/解吸影响因素研究

Impact Factors on Gas Adsorption and Desorption of Typical Mining Area in Southwest China

为了探讨煤质、变质程度、变形程度、实验温度、压力等因素对煤吸附/解吸性能的影响,系统采集了西南典型矿区煤样,进行了煤岩测试、工业分析和等温吸附/解吸实验。结果表明:中变质阶段,煤的吸附能力与变质程度呈正相关,高变质阶段呈负相关,Ro,max在3%左右吸附能力最强;煤的吸附能力与镜质组含量呈正相关,与惰质组含量呈负相关;低-特高固定碳阶段,煤的吸附能力与固定碳含量呈正相关关系,水分、挥发分的存在降低了煤的吸附能力;变形程度越高,吸附/解吸能力越强;温度升高,煤吸附量下降,解吸率增高。压力升高吸附量增大,解吸率下降。

The coal petrography analysis,proximate analysis and isothermal adsorption experiment of samples from Southwest typical mining area are carried out to investigate the influence of coal quality,metamorphic grade,deformation degree,experimental temperature and pressure on gas adsorption and desorption capacity.The results show that:there is a positive correlation between metamorphic grade and gas adsorption capacity at medium-rank metamorphism stage,and there is a negative correlation between metamorphic grade and gas adsorption capacity at high-rank metamorphism stage,and has the strongest adsorption capacity at the nearby 3 percent of Ro,max;the capacity of the coal adsorption has a normal correlation to the vitrinite content and an inverse correlation to the inertinite content of the coal;the capacity of the coal adsorption has a normal correlation to the fixed carbon content,and Moisture and volatile matter in coal can decrease the adsorption capacity of the coal reservoirt;the higher the deformation degree,and the stronger gas adsorption and desorption capacity of the coal;the adsorption capacity of gas decreases and the desorption efficiency increase with temperature increase.the adsorption capacity of gas increase and the desorption efficiency decreases with pressure increase.