基于CO浓度的煤低温氧化动力学试验研究

摘要

In order to study the stage feature of coal during the low temperature oxidization process and the coal dynamics features at different stages, the gas chromatograph were applied to measure the CO density occurred from the oxidation of coal sample under different temperature and under the condition of the programmed temperature rising. The study found the polynomial relationship between CO density and temperature, which could be the coal oxidization reaction function model. The fitting sectionally conducted with the dynamics analysis integral method found that between 30 ℃ and 80 ℃, the coal sample would not heave linear relationship and fitting effect was poor. When the temperature was between 80 ℃ and 200 ℃, the fitting of the coal sample would be over 0.99 and fitting effect would be good. The study results showed that in the low temperature oxidization process, before and after the critical temperature reached, not only the dynamics parameters would have difference and the one reaction function model could not be fully to explain the reaction mechanism.%为了研究煤低温氧化过程的分阶段特性以及不同阶段所表现出的动力学特征,采用气相色谱仪测定在程序升温条件下煤样在不同温度时氧化产生CO的浓度,研究发现CO浓度与温度呈多项式的关系,并以此作为煤氧反应函数模型;按照动力学分析积分法分段进行拟合发现,测试煤样在30～80℃不具有线性关系,拟合效果很差;在80～200℃的相关系数达到0.99以上,拟合效果很好。研究结果表明：煤低温氧化过程中,在临界温度点前后不仅其动力学参数有差异,且只用一个反应函数模型可能不能充分解释其反应机理。