摘要
资源化处理回收废旧晶体硅光伏组件迫在眉睫,而其关键在于乙烯-醋酸乙烯共聚物(EVA)薄膜的处理。面向EVA处理提出了有氧热解方法,展开有氧热解失重特性、动力学及产物特性分析,结果表明:随着氧气浓度的增加,最大失重速率从1.8%(质量分数)/s增加到3.0%(质量分数)/s,EVA在较低温度下热分解更多且速率更快,整体有氧热解活化能呈现出下降的趋势。这是由于氧气的存在促进了氧化反应,加速了有氧热解过程。随着热解终温的升高,焦与油产率呈下降趋势,气产率则随之增加。在2%氧气浓度下,热解终温的提高有利于CH4、C2H6物质富集,有利于油中羧类物质转化为烷烃、烯烃及醇类,使得焦逐渐由非晶质结构朝芳香化与石墨化转变。
Resource treatment and recycling of waste crystalline silicon photovoltaic modules is urgent,and the key lies in the processing of ethylene vinyl acetate copolymer(EVA)films.This paper focuses on EVA treatment,proposing an aerobic pyrolysis method,and delves into the characteristics of aerobic pyrolysis mass loss,kinetics,and product analysis.The research findings indicate that with increasing oxygen concentration,the maximum mass loss rate increases from 1.8%(mass)/s to 3.0%(mass)/s,indicating more rapid and abundant thermal decomposition of EVA at lower temperatures.As the oxygen concentration rises,the overall aerobic pyrolysis activation energy shows a decreasing trend.This is attributed to the presence of oxygen promoting oxidation reactions,accelerating the aerobic pyrolysis process.With the increase in final pyrolysis temperature,the yields of coke and oil decrease,while gas yield increases.At 2%oxygen concentration,the increase in final pyrolysis temperature favors the enrichment of CH4 and C2H6 substances in the gas phase,facilitates the conversion of carboxylic substances in oil to alkanes,alkenes,and alcohols,leading to the gradual transition of coke from amorphous structure to aromatization and graphitization.
作者
丁湧
李文建
陈昭宇
曹立辉
刘轩铭
任强强
胡松
向军
DING Yong;LI Wenjian;CHEN Zhaoyu;CAO Lihui;LIU Xuanming;REN Qiangqiang;HU Song;XIANG Jun(Guoneng Jiangxi New Energy Industry Co.,Ltd.,Nanchang 330029,Jiangxi,China;National Energy Group Jiangxi Electric Power Co.,Ltd.,Nanchang 330077,Jiangxi,China;State Key Laboratory of Coal Combustion,Huazhong University of Science and Technology,Wuhan 430074,Hubei,China)
出处
《化工学报》
EI
CSCD
北大核心
2024年第9期3310-3319,共10页
CIESC Journal
基金
国家自然科学基金面上项目(52076097)。
关键词
光伏组件
EVA
有氧热解
氧气
失重
动力学
产物
photovoltaic modules
ethylene vinyl acetate
aerobic pyrolysis
oxygen
mass loss
kinetics
products
