煤对超临界CO2的吸附实验及不同表征模型对比
Adsorption experiments of supercritical CO2 by coals and comparisons of different description models
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摘要: 煤对超临界CO2的吸附特征决定了煤层的CO2地质封存能力。通过体积法高压CO2吸附实验研究了3种吸附模型对不同变质程度煤样及活性炭吸附数据的表征效果。结果表明：压力在8 MPa附近时的CO2密度变化率最大，引入k值可有效提高拟合效果并“圈住”实验中的各种误差，铁法和卧龙湖煤样对CO2的吸附机理更大程度上是微孔填充；由于窑街煤样天然赋存于CO2气藏，受实验室超临界CO2作用改造效果微弱，其微孔较为发育，最大绝对吸附量高于其他煤样；气体密度逐渐增大时，过剩吸附量和绝对吸附量之间的差距越来越大，绝对吸附量决定了煤样的最大吸附能力；OK格子模型拟合出活性炭中CO2吸附相密度为1.004 g/cm3。Abstract: Adsorption characteristic of supercritical CO2 on coal directly determines the CO2 geological storage capacity. Through volumetric method, this paper analyzed the manifestation effects of different models on the experimental data of various ranked coals and activated carbon. The results indicate that the variation rate of gaseous CO2 density reaches the peak around 8 MPa. Introduction of parameter k could improve the fitting quality and trap various experimental errors. The adsorption mechanism of coal samples from Tiefa and Wolonghu is micropore filling. As coal samples of Yaojie is collected from a CO2 -rich reservoir, the alteration effect by experimental CO2 adsorption is unobvious and its micropores develop quite well, thus the greatest absolute adsorption is higher than other samples. When the gas density increases gradually, the gap between excess adsorption and absolute adsorption widens, and the absolute adsorption determines the adsorption capacity of the coal samples. The fitting CO2 adsorbed phase density of the activated carbon by OK model is 1.004 g/cm3.
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