褐煤在微波场下的孔隙结构及其分形维数变化特征

发布时间：2018-03-20 02:21

本文选题：分形维数　切入点：孔隙结构　出处：《中国矿业》2017年05期 　论文类型：期刊论文

【摘要】：为了探究微波辐照对褐煤孔隙结构及表面形貌的影响,将低温氮吸附法和扫描电镜相结合。测定了煤样经微波辐照前后比表面积、孔容、平均孔径及分形维数的变化;通过扫描电镜清楚观察到煤样的孔隙形状及表面形貌。试验表明:随着微波辐照时间/功率的增加,煤样孔隙分形维数值逐渐减小;平均孔径逐渐减小,比表面积和孔容先明显减小随后略微增加;褐煤表面逐渐趋于平整光滑,孔洞收缩。
[Abstract]:In order to investigate the effect of microwave irradiation on pore structure and surface morphology of lignite, the changes of specific surface area, pore volume, mean pore size and fractal dimension of coal samples before and after microwave irradiation were determined by combining low temperature nitrogen adsorption method with scanning electron microscope. The pore shape and surface morphology of coal samples were clearly observed by SEM. The experimental results show that the fractal dimension of pores decreases with the increase of microwave irradiation time / power, and the average pore size decreases gradually with the increase of microwave irradiation time / power. The specific surface area and pore volume decreased obviously and then increased slightly, and the surface of lignite gradually tended to be smooth and smooth, and the pores shrank.
【作者单位】：中国矿业大学(北京)化学与环境工程学院;
【基金】：国家自然科学基金面上项目“微波辐照强化褐煤成浆机制的研究”资助(编号:51574251);国家自然科学基金项目资助(编号:51274208,51204190) 国家重点基础研究计划(973)项目资助(编号:2012CB214900)
【分类号】：TD849.2

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