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。
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.
出处
《生物质化学工程》
CAS
2007年第3期1-5,共5页
Biomass Chemical Engineering
基金
国家重大基础研究前期研究专项(2004CCA07300)
国家自然科学基金(20676002)
安徽省优秀青年科技基金项目(04044059)
关键词
海藻
裂解
热解机理
动力学
seaweed pyrolysis thermolysis mechanism kinetics
