Aerobic pyrolysis kinetic and product characteristics of waste crystalline silicon photovo ltaic modules'EVA
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.
万方数据
维普
