【摘要】 采用热分析技术研究了两种海藻的热解特性。热解实验在流量为100 mL/min的氮气气氛下,加热终温为700℃,升温速率为10、20、30、50和80℃/min的条件下完成。由失重和失重速率曲线分析表明:热解过程大致可以分为4个阶段:脱水、两个主要脱挥发分和残留物分解。根据热重实验数据,采用Popescu法确定海藻热解机理函数并且计算活化能和指前因子,结果表明Avrami-Erofeev方程可以用来描述海藻的主要挥发分脱除过程,热解机理为随机成核和随后生长机理。随着转化率的增加,活化能和指前因子也随着增加。说明转化率低,热解较容易发生。更多还原

【Abstract】 The pyrolytic characteristics of two seaweeds were investigated by thermogravimetric analysis technique.The pyrolysis experiments were performed up to 700℃ at heating rates of 10、20、30、50 and 80℃/min in a dynamic nitrogen flow of 100mL/min.The results showed four stages(dehydration,two main devolatilizations and residual decomposition) appeared in the pyrolysis process.Activation energies and pre-exponential factors were calculated by Popescu method.Experment results indicated that Avrami-Erofeev equation was suitable for describing the main devolatilization process of seaweed.Thermolysis mechanism was random nucleation and nuclei growth.With the increasing of conversion,activation energies and pre-exponential factors were also increased.This showed that pyrolysis took place easily when conversion rate was low.更多还原