Experimental Study on CO2 Adsorption Capacity on Coal

用恒容法进行了吸附/脱附实验，分析了孔结构与CO_2吸附/脱附特性的关系。用精确状态方程(R·Span和W.Wagner方程，R·Span和W·Wagner方程，CH_4方程)对过量吸附进行了分析。结果如下：1)CO_2单吸附实验。用5种煤样(Akabira煤、太黑育煤、雅伦煤、茅河煤和活性碳)进行了高达11 Mpa的制气试验。活性碳对CO_2的超额吸附能力最强。茅河煤的吸附等温线与太黑约煤的吸附等温线相似。结果表明，具有相似孔隙分布的煤具有相似的吸附等温线。2)利用太黑窑煤和活化…的实验结果绘制了CO_2的吸附和解吸等温线。更多的碳。CO_2在太黑育煤上的保留率比活性炭强。3)对超临界CO_2处理后的煤进行了CO_2吸附实验。观察治疗前后吸附量的变化。4)根据茅河煤和活性碳的吸附实验结果，绘制了CH4吸附等温线。CO_2和CH_4的吸附量之比为2：1。然而，本研究的实验结果显示不同样品之间的比例不同，并提出了孔结构与CO_2吸附特性的关系。认为超临界CO_2引起的煤内部结构变化对CO_2具有有效的封存作用，具有大量微孔的干燥高煤级煤有利于CO_2的封存。这导致了对CO_2的吸附量增加。较少

Adsorption/desorption experiments are performed by constant volume method to analyze the relation between the pore structure and the adsorption/desorption characteristic of CO_2. The experiments are conducted at 40 degrees C using the constant volume method. Accurate EOS (R. Span and W. Wagner EOS for CO_2, Redlich-Kwong EOS for CH_4) was used for analyzing the excess sorption.Four types of experiments had been performed and get the. following results.1)The adsorption experiment by CO_2 single. gas up to 11MPa was performed with five samples (Akabira coal, Taiheiyo coal, yallourn coal, Maokhe coal and Activated carbon). Activated carbon has the highest amount of CO_2 excess sorption. The adsorption isotherm of Maokhe coal was Similar to that of Taiheiyo coal. The result suggests that the coals, which have similar pore distributions shows similar adsorption isotherm.2)CO_2 adsorption and desorption isotherms were drawn by the result of experiment performed by Taiheiyo coal and Activated … More carbon. Retentivity of CO_2on Taiheiyo coal was stronger than that of Activated carbon. It might be occurred by the formation of pores or the improvement of the quality of the coal by the effect of supercritical fluid.3)CO_2 adsorption experiment to the coal, being treated by supercritical CO_2 was performed by Taiheiyo coal and Akabira coal. The change of the amount of adsorption before and after treatment was observed. The cause might be structural change accompanying contraction of coal.4)CH_4 adsorption isotherms are drawn by the result of experiment performed by Maokhe coal and Activated carbon. It is said that the ratio of the adsorption amount of CO_2 and CH4 is 2:1. However, the experimental results in this research show the different ratio among the samples.Relation of pore structure and CO_2 adsorption characteristic was suggested. It is considered that the structural change inside coal because of supercritical CO_2 is effective to sequestrate CO_2. It is considered also that the dry and high rank coal that has many micro pores is advantageous to CO_2 sequestration. It leads to the increase of the amount of CO_2 adsorption. Less