求解聚合物绝缘热解反应活化能的改进算法  

An Improved Algorithm To Calculate the Activation Energy of Pyrolysis Reaction of Polymer Insulation

作　　者：任鹏 李庆民 刘红磊 彭鹏 金虎 李锐海 王伟[3] REN Peng;LI Qingmin;LIU Honglei;PENG Peng;JIN Hu;LI Ruihai;WANG Wei(State Key Laboratory of Alternate Electrical Power System with Renewable Energy Sources(North China Electric Power University),Changping District,Beijing 102206,China;Electric Power Research Institute of China Southern Power Grid,Guangzhou 510080,Guangdong Province,China;Electric Power Research Institute,State Grid Tianjin Electric Power Company,Hexi District,Tianjin 300384,China)

机构地区：[1]新能源电力系统国家重点实验室(华北电力大学),北京市昌平区102206 [2]南方电网科学研究院有限责任公司,广东省广州市510080 [3]国网天津市电力公司电力科学研究院,天津市河西区300384

出　　处：《中国电机工程学报》2020年第19期6371-6379,共9页Proceedings of the CSEE

基　　金：国家自然科学基金项目(51737005);国家青年基金项目(51807060);北京市自然科学基金(面上项目)(3192036);中央高校基本科研业务费项目(2019QN114)。

摘　　要：基于材料本征特性的活化能参数,为评估聚合物绝缘的老化状态和剩余寿命提供了新的技术途径,但其前提须准确求解材料的活化能数值。基于温度积分的等效处理,研究提出Arrhenius温度积分的两种变换形式,都具有较好的适用性和准确度。根据温度积分的第一种变换形式,建立升温速率比值的动力学方程,既适用于反应过程平均活化能的计算,也可求解非等温条件下的活化能,且无须设定反应机理函数。采用提出的第二种温度积分变换形式,改进了求解活化能的传统Flynn-Wall-Ozawa算法。应用2种改进方法求取盆式绝缘子复合绝缘和交联聚乙烯的热解活化能,与传统的Flynn-Wall-Ozawa算法相比,具有较高的计算准确度。研究还进一步表明,低温近似处理对求解活化能的影响可以忽略。上述工作为准确解析聚合物绝缘的热解活化能提供了有效的方法。Based on the intrinsic characteristics of materials,the activation energy parameter can provide an alternatively feasible way as to achieve accurate assessment of the aging state and residual life of polymer insulations,however,accurate calculation of activation energy still remains a pending issue.According to equivalent approximation of the temperature integration,this paper proposed two kinds of transformation forms of the Arrhenius temperature integration,both of which render preferable applicability and accuracy.Based on the first transformation form of temperature integral,a thermal dynamic equation was established in term of the ratio of the heating rate,which is not only suitable for calculating the average activation energy of the reaction process,but also for that under non-isothermal conditions,without recurring to the reaction mechanism function.With the second transformation form of temperature integral being applied,the Flynn-Wall-Ozawa method was modified and improved in accuracy.Both methodologies were used to obtain the pyrolysis activation energy of the GIS insulator and the cross-linked polyethylene,which shows superior accuracy to the traditional Flynn-Wall-Ozawa method.Further research indicates that,the impact of low temperature approximation on activation energy calculation is negligible.The above proposed research presents effective methodologies in calculating the pyrolysis activation energy of polymer insulations.

关 键 词：聚合物绝缘 热动力学 活化能 温度积分 

分 类 号：TM216[一般工业技术—材料科学与工程]