煤燃烧反应活化能的两种研究方法的比较

Comparison of Two Methods for Analyzing the Activation Energy of Coal Combustion

采用单个扫描速率法中的Coats-Redfern法和多重扫描速率法中的等转化率法对三种煤的燃烧反应的活化能进行了研究。结果表明:Coats-Redfern法需要对反应机理函数进行假设,显示的活化能值受升温速率的影响较大,对不同煤种的区分也不明显。而等转化率法不需要假设机理函数,而且可以减小升温速率所导致的误差,可以较好地区分不同煤种的活化能值。

The activation energy in combustion reactions of three kinds of coal has been analyzed by the Coats-Redfern method, which is one of the individually scanning methods, as well as by the isoconversional method, which is one of the multiple scanning methods. Results indicate that： the Coats-Redfern method requires the assumption of the reaction＇s kinetic mechanism function; the displayed activation energy value is markedly affected by the heating rate, while not diftering much for different kinds of coal. The isoconversional method on the other hand doesn＇ t need any kinetic mechanism thnction to be assumed; it is able to diminish the error caused by the heating rate and can easily distinguish the differing activation energy of different kinds of coal.