煤吸附CH4 /CO2混合气体的试验研究
Experimental research on coal adsorption of CH4 and CO2 mixed gas
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摘要: 为了揭示CH4 /CO2混合气体在煤中的竞争吸附特性，开展了5种不同比例CH4 /CO2混合气体在煤中的等温吸附试验。试验表明：纯CH4、纯CO2 吸附量与气体压力的关系满足Langmuir方程，相同条件下，煤吸附CO2是CH4的2倍；不同比例 CH4 /CO2混合气体吸附量总是介于单组分CH4和CO2之间，煤对混合气体不是独立吸附，而是竞争吸附，CO2在竞争吸附过程中占优势；随混合气体中CO2体积分数增加，吸附选择性系数增大，且始终大于1，表明注入CO2驱替CH4是可行的，即CO2-ECBM/CO2封存是可行的；BET多组分气体吸附模型更适合预测煤吸附CH4 /CO2混合气体的量。Abstract: In order to reveal the competitive adsorption characteristics of CH4 /CO2 mixed gas in coal, the isothermal adsorption experiments of five different ratios of CH4 /CO2 mixed gas in coal were carried out. Experiments show that the relationship between the adsorption amount of pure CH4 and pure CO2 and the gas pressure satisfies the Langmuir equation. Under the same conditions, the adsorption capacity of CO2 by coal is twice that of CH4; the adsorption capacity of mixed gas of CH4 /CO2 with different ratios is always between the single-component CH4 and CO2; coal does not adsorb mixed gas independently, but competitively, and CO2 is dominant in the process of competitively adsorption; as the volume fraction of CO2 in the mixed gas increases, the adsorption selectivity coefficient increases, and it is always greater than 1, indicating that CO2 injection is feasible to displace CH4, that is, CO2-ECBM/CO2 storage is feasible; the BET multi-component gas adsorption model is more suitable for predicting the amount of CH4 /CO2 mixed gas adsorbed by coal.
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