基于TG/DTA技术的花生壳热解动力学分析  

Based on the TG /DTATechnology of Peanut Shells Pyrolysis Dynamics Analysis

作　　者：王玉[1] 周日辉[1] 李金江[1] 

机构地区：[1]江西师范大学理化测试中心,江西南昌330022

出　　处：《广州化工》2014年第17期99-101,170,共4页GuangZhou Chemical Industry

摘　　要：对花生壳在升温速率分别为5℃/min、10℃/min、15℃/min和20℃/min的条件下进行热重实验,采用FreemanCarroll、Kissinger、Flynn-Wall-Ozawa和Friedman四种热分析方法,研究花生壳的热行为及其热分解的动力学参数。研究表明,花生壳非等温热解过程可分为失水干燥、快速热解和缓慢分解三个阶段,其中第二阶段是整个过程的主要部分,析出大量挥发分造成明显失重,随着升温速率的增加,最大热解速度提高,对应的峰值温度升高,热滞后现象加重,热解各阶段向高温侧移动。其热解阶段的反应动力学方程为:dα/dt=4.92×1014[exp(-170.70×103/RT)](1-α)2.04。The thermal behavior and kinetic parameters of the decomposition of peanut hull in a temperature- programmed mode at different heating rate of 5,10,15 and 20 ℃ /min were investigated based on Freeman- Carroll,Kissinger,Flynn-Wall- Ozawa and Friedman methods by TG. The results showed that the non- isothermal pyrolysis process of peanut hull included three distinct stages of dehydration,fast- pyrolysis and residue slow decomposition. The second stage in which a huge amount of released volatile components caused the distinct weight loss of peanut hull played a main role in the whole process.With the increase of heating rate,the maximum decomposition rate and its corresponding temperatures of peanut hull increased.The TG curve shift to higher temperatures due to the aggravating hermal lag. The kinetic equation of thermol decomposition of peanut hull was expressed as： dα/dt =4. 92 ×10^14[exp（-170.70 ×10^3/RT） ]（ 1- α）^2. 04.

关 键 词：花生壳 热解 动力学 

分 类 号：O643[理学—物理化学]