煤及其拔头半焦的燃烧反应特性研究

采用热天平研究了贵州褐煤、三江原煤及其拔头半焦的燃烧行为,考察了粒径和升温速率对样品着火点和燃烧稳定性的影响。减小样品的粒径可显著降低样品的着火点,改善样品的燃烧性能,在粒径100～120目和升温速率25℃/min下,样品的燃烧稳定性最好。根据Coats-Redfern方法求解燃烧反应动力学参数。燃烧反应动力学分析表明,三种样品的热天平燃烧反应均为一级反应,并得到了实验样品的燃烧反应动力学参数,表观活化能E和指前因子A。贵州褐煤的活化能为100.0～163.6 kJ/mol,三江原煤的活化能为73.4～161.2 kJ/mol,三江煤焦的活化能为68.3～178.1 kJ/mol。

Combustion characteristics of coal and coal char from coal topping process

A systematic research on the combustion characteristics of Guizhou lignite,Sanjiang coal and Sanjiang char had been done using STA 409C Netzh-thermogravimetric analyzer.The effects of particle diameter and heating rate on maximum mass loss rate,ignition point and combustibility were analyzed.The decrease of particle diameter can reduce the ignition point and improve the combustibility.When particle size is 100～120 mesh and heating rate is 25℃/min,the combustibility of samples is the best.The combustion reactions are one-order reaction and kinetics parameters(activation energy E and frequency factor A) were obtained by the method of Coats-Redfern basing on experimental data.Activation energy of Guizhou lignite,Sanjiang coal and Sanjiang char are 100.0～163.6kJ/mol,73.4～161.2kJ/mol,68.3~178.1kJ/mol.