采用热重分析法研究煤和发酵玉米秸秆的热分解及动力学。
Thermal decomposition and kinetics of coal and fermented cornstalk using thermogravimetric analysis.
机构信息
School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, PR China.
School of Chemical Engineering and Energy, Zhengzhou University, Zhengzhou 450001, Henan, PR China; Henan Outstanding Foreign Scientists' Workroom, Zhengzhou 450001, Henan, PR China.
出版信息
Bioresour Technol. 2018 Jul;259:294-303. doi: 10.1016/j.biortech.2018.03.043. Epub 2018 Mar 15.
The thermal behavior and kinetics of Yiluo coal (YC) and the residues of fermented cornstalk (FC) were investigated in this study. The Kissinger-Akahira-Sunose (KAS) and Flynn-Wall-Ozawa (FWO) methods were used for the kinetic analysis of the pyrolysis process. The results showed that the activation energy (E) was increased with the increase of the thermal conversion rate (α), and the average values of E of YC, FC and the blend (m/m = 6/4) were 304.26, 224.94 and 233.46 kJ/mol, respectively. The order reaction model function for the blend was also developed by the master-plots method. By comparing the E and the enthalpy, it was found that the blend was favored to format activated complex due to the lower potential energy barrier. Meanwhile, the average value of Gibbs free energy of the blend was 169.83 kJ/mol, and the changes of entropies indicated that the pyrolysis process was evolved from ordered-state to disordered-state.
本研究考察了伊洛煤（YC）和发酵玉米秸秆（FC）残渣的热行为和动力学。采用 Kissinger-Akahira-Sunose（KAS）和 Flynn-Wall-Ozawa（FWO）方法对热解过程进行了动力学分析。结果表明，随着热转化率（α）的增加，活化能（E）增加，YC、FC 和混合物（m/m=6/4）的平均 E 值分别为 304.26、224.94 和 233.46 kJ/mol。通过主图法还开发了混合物的级数反应模型函数。通过比较 E 和焓，发现由于较低的位能垒，混合物有利于形成活化复合物。同时，混合物的平均吉布斯自由能值为 169.83 kJ/mol，熵的变化表明热解过程是从有序态向无序态演变的。
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