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采用容积法研究了在298K下7种煤样对甲烷的吸附能力,结果显示煤样的甲烷吸附等温线呈Ⅰ型,因此可用单分子吸附机理解释超临界甲烷吸附机理.在此基础上,根据FrenkelHalsey-Hill(FHH)方程计算了各煤样的分形维数D,计算结果符合2≤D≤3.运用灰色关联理论分析了固定碳、干基挥发分、灰分等因素对煤样分形维数的影响.结果显示,固定碳、干基挥发分、平均孔径的灰色关联度均大于0.8,对煤样分维影响很大;比表面积、孔容的灰色关联度都大于0.7,对煤样分维的影响较大;灰分的灰色关联度最小,对分维的影响也最小,但是不能被忽略.
The adsorption capacity of methane for seven coal samples at 298K was studied by volumetric method. The results showed that the methane adsorption isotherm of coal sample was type Ⅰ, and therefore the adsorption mechanism of supercritical methane could be explained by single molecule adsorption mechanism. On this basis, FrenkelHalsey-Hill (FHH) equation was used to calculate the fractal dimension D of each coal sample, and the calculated result was in accordance with 2≤D≤3. The gray relational theory was used to analyze the effect of fixed carbon, dry-based volatile and ash on the fractal dimension The results showed that the gray relational values of fixed carbon, dry basis volatile matter and average pore diameter were all greater than 0.8, which had a great influence on the fractal dimension of coal samples. The gray relational degree of specific surface area and pore volume were all above 0.7. The influence of dimension is larger; the gray relational degree of ash is the smallest, and the influence on fractal dimension is also the smallest, but it can not be neglected.