数据处理方法对无烟煤燃烧动力学参数求解结果的影响

Influence of mathematical methods on the kinetic parameters calculation of anthracite combustion

针对利用热分析仪研究无烟煤燃烧动力学参数时数据处理方法和机理函数的选择影响其结果的问题进行了分析和研究。采用Achar微分法、Coats-Redfern积分法以及多重速率扫描Popescu法相结合的方法分析了三种无烟煤燃烧过程最可能的反应机理,考察了不同数学处理方法对求解动力学参数的影响,分析了数学处理过程的误差。研究结果表明:所测试的无烟煤燃烧反应的可能燃烧机理应为相边界反应的收缩体模型;不同数学处理方法所得动力学参数不同;数学处理过程不可避免的引入了较大的误差;所得动力学参数为表观参数。

The combustion kinetics of anthracite was investigated with thermogravimetric analyzer（TG）, Reaction mechanisms and kinetic parameters of anthracite combustion were determined from TGA data using classical non-isothermal kinetic method （Achar differential method and Coats-Redfern integral method） and multi-rate method（Popescu method）, then the influences of mathematical methods on the result and the sources of error locating at this treatment process were discussed. The results indicate that anthracite combustion is in according with the shrinking mechanism with surface reaction rate controlling,the thermoanalytical results are influenced by the mathematical treatment methods, the error is inevitable, and the kinetic parameters obtained are apparent parameters.