二氧化碳与水预处理煤样对甲烷吸附热效应特性的实验研究

研究煤体吸附甲烷的热效应对于深入揭示煤层气在煤表面的吸附机理有重要意义。通过C80微量量热仪测试了无烟煤、焦煤、褐煤在二氧化碳与水预处理前后的甲烷吸附热力学参数，得到甲烷的等温吸附曲线和吸附热曲线，并建立了甲烷吸附量—吸附热定量模型，从能量角度解释了煤样预处理前后对甲烷的吸附特性。研究结果表明:经二氧化碳与水预处理后，煤样对甲烷的吸附量以及吸附过程产生的微量吸附热均有所增加，且预处理对煤体造成的影响主要体现在能增大其表面孔隙结构。

Experimental study on thermal effect characteristics of methane adsorption for coal samples pretreated by carbon dioxide and water

The study on the thermal effect of coal methane adsorption has important significance for deeply revealing the adsorption mechanism of coalbed methane on coal surface. The thermodynamic parameters of methane adsorption for the anthracite, coking coal and lignite before and after the carbon dioxide and water pretreatment were tested by using the C80 micro calorimeter. The isothermal adsorption curves and adsorption heat curves of methane were obtained, and a quantitative model of the adsorption capacity and adsorption heat of methane was established, then the characteristics of methane adsorption of the coal samples before and after the pretreatment were explained from the perspective of energy. The results showed that both the methane adsorption capacity and the micro adsorption heat produced in the adsorption process of the coal samples increased after the carbon dioxide and water pretreatment, and the influence of the pretreatment on the coal mainly reflected in increasing its surface pore structure.