常见塑料的热解特性及其动力学分析

吕雯馨; 栾鹏鹏; 周慧; 王静兰; 何思蓉; 程占军; 李宁; 颜蓓蓓; 陈冠益

doi:10.13205/j.hjgc.202401015

常见塑料的热解特性及其动力学分析

doi: 10.13205/j.hjgc.202401015

吕雯馨¹,
栾鹏鹏^1,2,
周慧^1,2,
王静兰^1,2,
何思蓉³,
程占军^1,2, ,,
李宁^1,2,
颜蓓蓓^1,2,
陈冠益⁴

1. 天津大学环境科学与工程学院, 天津 300350;
2. 天津市生物质废物利用重点实验室/天津市有机固废安全处置与能源利用重点实验室/中低温热能高效利用教育部重点实验室, 天津 300072;
3. 江苏大学能源与动力工程学院, 江苏镇江 212013;
4. 天津商业大学机械工程学院, 天津 300134

基金项目:

国家自然科学基金(52176197,52100156,52322005)；中国科学院合肥大科学中心“高端用户培育基金”(2021HSC-UE006)

详细信息

作者简介:
吕雯馨(2001-),女,本科。463722758@qq.com

通讯作者:
程占军(1985-),男,教授,主要研究方向为固废资源化清洁高效利用、燃烧反应动力学等。zjcheng@tju.edu.cn

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出版历程
- 收稿日期: 2022-04-26
- 网络出版日期: 2024-04-29

PYROLYSIS CHARACTERISTICS AND KINETIC ANALYSIS OF COMMON PLASTICS

1. School of Environmental Science and Engineering, Tianjin University, Tianjin 300350, China;
2. Tianjin Key Lab of Biomass/Wastes Utilization/Tianjin Engineering Research Center for Organic Wastes Safe Disposal and Energy Utilization/Key Laboratory of Efficient Utilization of Low and Medium Energy of Ministry of Education, Tianjin 300072, China;
3. School of Energy and Power Engineering, Jiangsu University, Zhenjiang 212013, China;
4. School of Mechanical Engineering, Tianjin University of Commerce, Tianjin 300134, China

摘要

摘要: 研究塑料废弃物的热解特性有助于实现其清洁高效转化利用。借助热重技术总结对比了高密度聚乙烯、低密度聚乙烯和聚丙烯的不同升温速率(10,20,30,40,50℃/min)热解及不同催化剂(HZSM-5、Hβ和HUSY)催化热解的特性及规律。升温速率的增长使反应出现热迟滞现象,催化剂的加入对样品热解速率提高的效果也不尽相同。为了提供更有力的理论支持,运用3种动力学分析方法Coats-Redfern (CR)、Flynn-Wall-Ozawa (FWO)和分布式活化能法(DAEM),对样品在不同条件下的动力学参数进行计算和分析。CR模型验证了各热解反应符合一级化学反应模型并发现催化剂可以大幅降低反应活化能;FWO法和DAEM得到的表观活化能数值接近。DAEM模型显示活化能在转化率α增长的过程中先上升再逐步下降,在α=40%~50%时活化能最高,且包含动力学补偿效应。
- 塑料 /
- 热解 /
- 催化 /
- 动力学分析
Abstract: The study on pyrolysis characteristics of plastic waste is in favor of achieving its clean and efficient conversion and utilization. The catalytic pyrolysis characteristics of high-density polyethylene(HDPE), low-density polyethylene(LDPE), and polypropylene(PP), with three different catalysts of HZSM-5,Hβ and HUSY, were investigated by the thermogravimetric experiments at different heating rates of 10, 20, 30,40,50 ℃/min. The increase of heating rate caused thermal hysteresis, and the different types of catalysts had different effects on the improvement of pyrolysis rates of the HDPE, LDPE, and PP. In order to provide theoretical support, three kinetic modeling analysis methods, including Coats-Redfern(CR), Flynn-Wall-Ozawa(FWO), and distributed activation energy model(DAEM), were used to calculate the kinetic parameters of HDPE, LDPE, and PP pyrolysis under different conditions. CR method verified that each pyrolysis reaction was following the first-order reaction model and found that the catalysts could significantly reduce the activation energy of the reaction. The calculated activation energy by two iso-conversion rate methods, including the FWO method and DAEM, was similar to each other. The DAEM model, including the kinetic compensation effect, showed that the activation energy increased and then decreased as the conversion rate(α) increases, and reached the highest at α=40%~50%.
- plastic /
- pyrolysis /
- catalytic /
- kinetic analysis

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