聚烯烃基复合塑料热解动力学特性  

Kinetic Characteristics of Pyrolysis of Polyolefin-based Composite Plastics

作　　者：江平 于洁[2] JIANG Ping;YU Jie(Guangdong YueDian Yunhe Power Generation Co.,Ltd.,Yunfu 527300,Guangdong,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,China)

机构地区：[1]广东粤电云河发电有限公司,广东云浮5273000 [2]华中科技大学煤燃烧与低碳利用全国重点实验室,武汉430074

出　　处：《能源研究与管理》2024年第4期132-139,共8页Energy Research and Management

基　　金：水利部数字孪生流域重点实验室开放基金(Z0202042022)。

摘　　要：为了掌握复合废塑料的热裂解机制,对2种不同的复合塑料在不同升温速度下进行了热重实验。采用KAS和FWO方法对热重实验进行动力学分析,计算获得了样品的活化能分布;采用Malek法和C-R法相结合的方法,获得了最适合的热解动力学机理函数。结果表明:PE/PET和PE/PA样品热解过程分为两步反应,PET和PA要先于PE裂解;PE/PET样品热解后会生成少量焦炭;PE/PET样品活化能为221.62~280.67 kJ/mol,PE/PA样品活化能为202.86~266.63 kJ/mol,2种塑料样品的活化能随着热解反应的进行均呈现上升趋势;CPW1和CPW2热解反应符合R2几何收缩模型。通过本研究,掌握了复合塑料的热解机制,获得了反应活化能和反应模型,对于复合塑料的热解利用具有重要意义。To understand the pyrolysis mechanism of composite waste plastics, thermogravimetric experiments were conductedon two types of composite plastics at different heating rates. The kinetic analysis of the thermogravimetric data was performedusing the Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods to calculate the activation energydistribution of the samples. The Malek method combined with the Coats-Redfern (C-R) method was used to determine themost suitable kinetic mechanism function for the pyrolysis process. The results show that the pyrolysis of both PE/PET andPE/PA samples occurs in two reaction steps, with the decomposition of PET and PA occurring prior to that of PE. A smallamount of char is formed after the pyrolysis of the PE/PET sample. The activation energy of the PE/PET sample ranges from221.62 kJ/mol to 280.67 kJ/mol, while that of the PE/PA sample ranges from 202.86 kJ/mol to 266.63 kJ/mol. For both typesof plastic samples, the activation energy increases as the pyrolysis reaction progresses. The pyrolysis reactions of CPW1 andCPW2 conform to the R2 geometric contraction model. This study provides insights into the pyrolysis mechanism of composite plastics, determining the reaction activation energy and kinetic models, which hold significant value for thepyrolytic utilization of composite plastics.

关 键 词：复合塑料 动力学分析 反应模型 活化能 

分 类 号：TQ325.1[化学工程—合成树脂塑料工业]