摘要
采用热重法(TG)-微分热重法(DTG)-差热分析法(DTA)研究玉米秸秆沼渣热解过程及热裂解反应动力学特征和机理。研究结果表明玉米秸秆沼渣的失重过程分为吸附水蒸发阶段和秸秆裂解、挥发性物质蒸发阶段。热解过程中,加热速率对玉米秸秆沼渣热解有显著作用。使用FWO、KAS和Popescu方法计算出其热解活化能分别为233、359、358 kJ/mol。对41种常用热裂解动力学机理函数分析确定其热裂解动力学机理为三级方程g(α)=(1-α)-2。扫描时电子显微镜(SEM)分析表明,热裂解可破坏玉米秸秆沼渣的木质纤维束状结构,降低木质纤维中的木质素和半纤维素的质量分数,但效果随升温速度的增大而变差。
Thermal decomposition and kinetics of corn stove biogas residues were studied by TG-DTG/DTA. The TG-DTG curve showed the process of mass loss of the substance proceeded in two steps. The first stage could be attributed to the expulsion of water of crystallization. The second stage was corresponding to the devolatilization and decomposition of the molecular structure. Heating rate had a significant effect on the pyrolysis of the corn stove biogas residues. The activation energy E of the second stage of degradation process obtained by FWO,KAS and Popescu method were 233,359 and 358 kJ/mol respectively. According to Popescu mechanism functions,the possible kinetic model was estimated to be formula three g(α)=(1-α)-2. SEM showed that pyrolysis damaged the wood fiber beam structure of corn stove biogas residue,reduced the mass fraction of hemicellulose and lignin of wood fiber,but the effect got worse with the increase of heating rate.
作者
冯传兴
李慧
王琪
周泉城
Feng Chuanxing;Li Hui;Wang Qi;Zhou Quancheng(School of Agricultural Engineering and Food Science,Shandong University of Technology,Zibo 255049,China)
出处
《太阳能学报》
EI
CAS
CSCD
北大核心
2020年第2期1-5,共5页
Acta Energiae Solaris Sinica
基金
山东省重点研发计划(2019GNC106084)
山东省重点研发计划(医用食品专项计划)(17YYSP017)
山东省研究生教育管理项目(117009)
山东理工大学研究生教育创新团队(4053-218049)。
作者简介
通信作者:周泉城(1977-),男,博士、副教授、硕士研究生导师,主要从事生物质能源方面的研究。271977361@qq.com。
