| 超临界状态下煤岩吸附/解吸二氧化碳的实验 |
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| 引用本文： | 李全中,倪小明,王延斌,高莎莎.超临界状态下煤岩吸附/解吸二氧化碳的实验[J].煤田地质与勘探,2014,42(3):36-39. |
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| 作者姓名： | 李全中 倪小明 王延斌 高莎莎 |
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| 作者单位： | 河南理工大学能源科学与工程学院;河南省瓦斯地质与瓦斯治理重点实验室—省部共建国家重点实验室培育基地;中国矿业大学地球科学与测绘工程学院; |
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| 基金项目： | 国家科技重大专项课题(2011ZX05042-003) |
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| 摘 要： | 查明超临界状态下煤岩对CO2的吸附/解吸特征，能为煤层气开采现场注CO2的注入参数选取提供理论依据。以山西屯留矿的瘦煤和寺河矿的无烟煤为研究对象，借助ISO-300型等温吸附实验仪分别进行了不同温度(35℃、45℃、55℃)、最高压力达到CO2临界压力以上时的吸附/解吸实验。结果表明:超临界状态下，随着压力升高，容量法测得的吸附量存在最大值，不代表煤样的绝对吸附量，而是Gibbs吸附量；根据煤岩在高压下吸附CO2的本质，计算出超临界状态下煤岩吸附/解吸CO2的真实量。超临界状态下煤岩吸附CO2的真实量与压力之间符合langmuir吸附曲线，随着吸附压力的升高，Gibbs吸附量与绝对吸附量之间的差值越来越大；随着温度的升高，煤样的饱和吸附量降低；同样条件下，高变质程度的无烟煤对CO2的饱和吸附量大于瘦煤；超临界状态下煤样对CO2的绝对吸附等温线和绝对解吸等温线是可逆的。
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| 关 键 词： | 超临界状态 二氧化碳 吸附/解吸曲线 Gibbs吸附量 |
| 收稿时间： | 2013-01-07 |
The experimental study on the adsorption/desorption of carbon dioxide in the coal under supercritical condition |
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| Abstract: | Identification of the CO2 adsorption/desorption characteristics in coal and rock under supercritical conditions can provide theoretical basis for in-situ CO2injection parameters. Taking the lean coal in Tunliu mine and anthracite in Sihe mine as the research object, by means of ISO-300 isothermal adsorption experiment instrument, the adsorption/desorption experiments in different temperature (35℃, 45℃, 55℃) were conducted with the maximum pressure above the critical pressure of CO2. The results show that under supercritical conditions, with the pressure rise, the adsorption capacity by capacity testing methods is of the maximum value, not represents the absolute adsorption, but is the adsorption of Gibbs. According to the essence of CO2 adsorption in coal and rock under high pressure, the real adsorption and desorption capacity under supercritical conditions were calculated. The relation between real adsorption capacity and pressure are accord with Langmuir adsorption curve, with the adsorption pressure rise, the difference values between the adsorption capacity of Gibbs and absolute adsorption capacity increase. With the temperature increase, the adsorption capacity is reduced. The adsorption capacity of anthracite is greater than the lean coal in the same conditions. The absolute adsorption isotherms and the absolute desorption isotherms under supercritical state of co2 are reversible. |
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