CAJ | 학술논문

利用热重分析技术对竹材在高纯N_2条件下,从室温至1273K进行了非等温热解分析,研究了升温速率(5、10、20和40K/min)对热解过程的影响,探讨了其热解机理.研究表明,竹材非等温热解过程主要分为失水干燥、快速热解和缓慢分解三个阶段组成,其中第二阶段是整个过程的主要阶段,析出大量挥发分造成明显失重.升温速率对热解过程有显著影响,随着升温速率的增加,最大热解速度增大,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.热解机理满足一维扩散Parabolic法则,反应机理函数为g(α)=α~2.不同升温速率下活化能为75.32-82.99kJ·mol~(-1),指前因子为1.17×10~5-1.12×10~6min~(-1).
이용열중분석기술대죽재재고순N_2조건하,종실온지1273K진행료비등온열해분석,연구료승온속솔(5、10、20화40K/min)대열해과정적영향,탐토료기열해궤리.연구표명,죽재비등온열해과정주요분위실수간조、쾌속열해화완만분해삼개계단조성,기중제이계단시정개과정적주요계단,석출대량휘발분조성명현실중.승온속솔대열해과정유현저영향,수착승온속솔적증가,최대열해속도증대,대응적봉치온도승고,열체후현상가중,열해각계단향고온측이동.열해궤리만족일유확산Parabolic법칙,반응궤리함수위g(α)=α~2.불동승온속솔하활화능위75.32-82.99kJ·mol~(-1),지전인자위1.17×10~5-1.12×10~6min~(-1).
The non-isothermal thermal degradation of bamboo was carried out in high pure nitrogen atmosphere from room temperature to 1273K,and the influence of heating rates of 5,10,20 and 40K/min on the pyrolysis was investigated by thermogravimetric methed.The mechanism of the thermal degradation was discussed.The results indicate that the non-isothermal thermal degradation process of bamboo has three distinct stages:dehydration,rapid pyrolysis and slow weight-loss.The second stage plays an important role in the whole process in that a huge amount of released volatile caused the distinct weight loss of bamboo.The heating rates show remarkable influence on the thermal degradation process.With the increasing of heating,rate of the maximum decomposition rate and its corresponding temperatures of bamboo increase.The TG curve and DTG peak shifted to higher temperature due to the increase in thermal Lag.The thermal degradation mechanism of bamboo is suitable for 1D diffuse Parabolic pre-exponential factors vary from 1.17×10~5 to 1.1 × 10~6min~(-1) at different heating rates.