| 孔隙分形结构对煤焦燃烧特性影响的数值研究 |
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| 引用本文： | 何威,何榕,王晓亮. 孔隙分形结构对煤焦燃烧特性影响的数值研究[J]. 中国电机工程学报, 2011, 31(20) |
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| 作者姓名： | 何威 何榕 王晓亮 |
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| 作者单位： | 清华大学热科学与动力工程教育部重点实验室,北京市海淀区,100084 |
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| 基金项目： | 国家重点基础研究发展计划项目(973项目)(2006CB200305); 国家自然科学基金项目(50976055)~~ |
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| 摘 要： | 为了研究煤焦颗粒的分形结构对煤焦燃烧特性的影响，采用随机漫步的算法生成了2组具有相近孔隙率和比表面积，但分形维数不同的颗粒模型。从分子运动论的角度建立分形多孔介质中的扩散模型，用简单碰撞理论(simplecollision theory，SCT)模拟煤焦与氧气的气固反应。在不同温度下对不同煤焦颗粒模型的燃烧进行了数值模拟，由数值计算的结果得到了不同孔隙结构的煤焦颗粒对应的表观动力学参数。结果表明，煤焦颗粒的分形维数对煤焦的表观反应参数有显著影响，分形维数越大，煤焦表观燃烧反应系数越小，呈现指数关系。
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| 关 键 词： | 煤焦燃烧 分形维数 数值模拟 气体扩散 |
Numerical Study on Effect of Fractal Pore Structure on Char Combustion Characteristics |
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| HE Wei , HE Rong , WANG Xiaoliang. Numerical Study on Effect of Fractal Pore Structure on Char Combustion Characteristics[J]. Proceedings of the CSEE, 2011, 31(20) |
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| Authors: | HE Wei HE Rong WANG Xiaoliang |
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| Affiliation: | HE Wei,HE Rong,WANG Xiaoliang(Key Laboratory for Thermal Science and Power Engineering of Ministry of Education,Tsinghua University,Haidian District,Beijing 100084,China) |
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| Abstract: | In order to investigate the effect of the fractal dimensions of the char particles on the combustion characteristics of the coal char,two groups of numerical char particle models with similar porosity and specific surface areas but different fractal dimensions were generated by the random walk algorithm.The diffusion model in the fractal porous media was established based on the kinetic theory of gas molecules.The heterogeneous reaction of the coal char with oxygen was modeled by the simple collision theory... |
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| Keywords: | char combustion fractal dimension numerical simulation gas diffusion |
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