Percolation Research on Fractal Structure of Coal Char

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• 作者：Hu Song ; Sun Xuexing ; Xiong Youhui ; Xiang Jun ; Li Min ; and Li Peisheng
• 刊名：Energy & Fuels
• 出版年：2002
• 出版时间：September 2002
• 年：2002
• 卷：16
• 期：5
• 页码：1128 - 1133
• 全文大小：712K
• 年卷期：v.16,no.5(September 2002)
• ISSN：1520-5029

文摘

Some parameters about pore network structure of coal char particle are calculated by nitrogenisotherm adsorption/desorption and SEM measured data. On the basis of the correlation betweenthe fractal dimension and the porosity of a porous solid, fractal models are constructed to representcoal particle and char (39.53% burnoff level) particles, respectively. Using the Monte Carlo method,random numbers with the similar distribution as that of pore radii of coal/char particle areassigned to the lattice sites of fractal models. Transport process on the fractal structure of modelis studied with the help of invasion percolation simulation. It is shown that D profiles in case ofmodel (a) has two steps. Percolation threshold of fractal model (a) and (b) are 0.425 and 0.430,respectively. Some critical parameters of coal/char particles are calculated.