煤粒孔隙的分形模型与分形特性研究

发布时间：2018-04-27 02:09

本文选题：分形模型 + 压汞法　；参考：《煤炭科学技术》2017年07期

【摘要】：为了定量表征煤粒孔隙结构特性,选取褐煤、烟煤和无烟煤3个不同煤阶煤样分别破碎成3个不同粒度的煤粒进行压汞试验,基于Menger海绵模型和热力学模型对试验数据进行处理,研究了煤粒孔隙的分形特性。研究表明:基于Menger海绵模型得到的试验曲线不符合线性关系,曲线分为2段,前段分形维数DM大于3,后段线性拟合度太低;采用热力学模型分析孔隙分形特性时,曲线呈现显著的线性关系,拟合度均在0.98以上,且分形维数DT均在2~3。表明热力学模型较Menger海绵模型更适合研究煤粒孔隙的分形特性。DT随着煤粒度的减小而减小,且煤粒度对其影响较小;DT随着煤阶的升高而减小,并从煤变质作用的角度分析了其原因。
[Abstract]:In order to quantitatively characterize the pore structure of coal particles, three different rank coal samples, lignite, bituminous coal and anthracite, were broken into three different sizes of coal to carry out mercury injection test. Based on Menger sponge model and thermodynamic model, the fractal characteristics of coal pore were studied. The results show that the experimental curve based on Menger sponge model does not accord with the linear relationship, the curve is divided into two sections, the fractal dimension DM of the front segment is greater than 3, and the linear fitting degree of the posterior segment is too low. The curve showed a significant linear relationship, the fitting degree was above 0.98, and the fractal dimension DT was 2 ~ 3 ~ 3. The results show that the thermodynamic model is more suitable than the Menger sponge model to study the fractal characteristics of coal pore. DT decreases with the decrease of coal particle size, and the influence of coal particle size on it decreases with the increase of coal rank. The causes of coal metamorphism are analyzed.
【作者单位】：中国矿业大学(北京)资源与安全工程学院;
【基金】：中海石油(中国)有限公司资助项目(YXKY-2016-ZY-08,FQTFWQYZL-14-071)
【分类号】：P618.11

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