软硬煤二元气体竞争吸附差异性研究
Study on Difference of Binary Gas Competitive Adsorption of Soft and Hard Coal
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摘要: 同一煤层软煤和硬煤物性参数特征不同,导致其对气体吸附行为存在差异。基于实验室测试模拟的方法,测试软硬煤体物性参数的差异性,搭建二元气体竞争吸附实验平台,研究软、硬煤体CO2和CH4竞争吸附特性规律。结果表明:除坚固性系数f值外,软硬煤基本参数相近,软煤微孔体积及孔表面积大于硬煤;单组分等温吸附,软煤吸附量大于硬煤,对CO2吸附量大于CH4,过程呈先增加后平缓趋势;煤对单一组分的CO2的吸附量最大,对CH4的吸附量最小,煤对CO2+CH4 2种混合气体总吸附量介于两者之间;随着吸附平衡压力增加,煤对混合气体的吸附曲线会逐渐远离煤对单一组分的CH4的吸附曲线,而不断接近CO2的吸附曲线。Abstract: The physical properties of soft coal and hard coal in the same coal seam are different, which leads to the difference in gas adsorption behavior. Based on the laboratory test simulation method, this paper tested the difference of physical parameters of soft and hard coal, built a binary gas competitive adsorption experimental platform, and studied the competitive adsorption characteristics of CO2 and CH4 of soft and hard coal. The results show that the basic parameters of soft and hard coal are similar except f value, and the pore volume and pore surface area of soft coal are larger than that of hard coal. The adsorption capacity of soft coal is greater than that of hard coal, and the adsorption capacity of CO2 is greater than that of CH4. The adsorption capacity of coal for CO2 of a single component is the largest, and that for CH4 is the smallest. The total adsorption capacity of coal for CO2+CH4 is between the two. As the adsorption equilibrium pressure increases, the adsorption curve of coal on mixed gas will gradually move away from the adsorption curve of coal on CH4 of a single component, but increasingly close to the adsorption curve of CO2.
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Keywords:
- soft coal /
- binary gas /
- competitive adsorption /
- physical parameter /
- isothermal adsorption
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