摘要
废塑料混合热解的研究可为废塑料热解工艺的设计提供理论和实验方面的参考。该文选取生活垃圾中废塑料聚乙烯(polyethylene,PE)、聚丙烯(polypropylene,PP)、聚氯乙烯(polyvinyl chloride,PVC)及其混合物做差热(differential thermal analysis,DTA)和热重(thermogravimetric,TG)实验,实验在氮气气氛下进行,温度从室温升到700℃,升温速率为10℃/min。讨论了废塑料典型组分之间的相互影响,并采用Coast-Redfern法进行热解动力学分析,得到废塑料典型组分的共热解特性及反应动力学参数。研究结果表明,由于废塑料混合热解时存在分子间自由基转移,PP促进了PE的热解,而PVC多烯共轭结构抑制了PE、PP的热解;不同的温度区间内,废塑料混合热解时出现协同或阻碍效应;将混合物实验所得活化能Ee与线性叠加值Ec对比发现,废塑料混合热解时存在的分子间自由基转移有效地降低了混合物的热稳定性,使其更容易热解。
Study copyrolysis of typical constituents of plastic wastes can provide theoretical and experimental references for the design of pyrolysis technology of plastic wastes. Differential thermal and thermogravimetric （TG） experiments were made by using typical constituents of plastic wastes： polyethylene （PE）, polypropylene （PP）, polyvinyl chloride （PVC） and their mixtures over the range from room temperature to 700 ℃ at the heating rate of 10 ℃/min in nitrogen atmosphere. The mutual effects of typical constituents of plastic wastes were analyzed , and pyrolysis kinetic investigations were carried out by Coast-Redfern integration method. Co-pyrolysis characteristics and kinetic parameters of typical constituents of plastic wastes were obtained. The results show that PP accelerates the pyrolysis of PE whereas PVC decelerates the pyrolysis of PE and PP on account of the intermolecular transfer of free radical ; Synergistic or impedimental effects present over the different temperature ranges during co-pyrolysis of mixed plastics;Comparing the experimental activation energy Ee with the linearly combined activation energy Ec of mixed plastics, stabilization of mixed plastics is reduced effectively as a result of the intermolecular transfer of free radical,which makes plastic wastes pyrolyse easily.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2010年第23期56-61,共6页
Proceedings of the CSEE
基金
"十一五"国家科技支撑计划重大项目(2008BAC46B06)~~
关键词
差热
热重分析
废塑料
共热解
动力学分析
differential thermal analysis （DTA）
thermogravimetric （TG） analysis
plastic wastes
co-pyrolysis
kinetic analysis
作者简介
刘义彬（1985-），男，硕士研究生，主要研究方向为废弃物资源化利用，liu372929@163．com
马晓波（1965-），女，博士，副教授，主要从事工程中传热问题及废弃物资源化利用的研究，本文通讯作者，maxiaobo@tongji．edu．cn
陈德珍（1969-），女，博士，教授，主要从事废弃物能源化利用及其污染控制方面的研究，chendezhen@tongji．edu．cn。
