摘要
煤燃烧的化学反应及其物质输运过程均具有非线性动力特征。燃烧过程是孔洞分形体的变化过程 ,其外表面结构的变化部分的反映出颗粒内部孔结构的变化过程。本文利用分形理论及其相关的图像处理方法对不同煤种、不同燃烧阶段煤焦外表面结构的SEM图像进行研究。研究结果表明 ,XIE法较适合计算煤焦表面分形维数 ;在燃烧过程中煤焦的外表面分形维数呈现两种变化趋势。通过最小二乘法多项式拟合确定煤焦外表面分形维数与燃尽率之间的关系式 。
Non linear dynamical character is shown on the chemical reaction and material transmittal process of coal combustion Fractal pore system changes with coal combustion Surface transformation of coal partially reflects the change of inner pore structure Based on the fractal theory and the methods of image disposal, we studied the SEM photographs of char samples with different kinds and different stages It was shown that surface fractal dimension of coal char changes with two trends There is relationship between coal samples with surface fractal dimension Comb ined with least square method, we regress the equation shown relationship between surface fractal dimension and char conversion, and calculate equation parameters of different coal samples
出处
《燃料化学学报》
EI
CAS
CSCD
北大核心
2002年第2期136-140,共5页
Journal of Fuel Chemistry and Technology
基金
国家自然科学基金 (5 0 1760 14 )~~
关键词
煤焦
燃烧
分形
SEM
最小二乘法
coal char
combustion
fractal theory
SEM
least square method
