Pyrolysis of pellets made with biomass and glycerol: Kinetic analysis and evolved gas analysis
Pyrolysis of pellets made with biomass and glycerol: Kinetic analysis and evolved gas analysis
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DOI：
10.1016/j.biombioe.2016.12.004
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发表时间：
2017-02
影响因子：
6
通讯作者：
P. Bartocci;A. Anca-Couce;K. Slopiecka;S. Nefkens;N. Ević;S. Retschitzegger;M. Barbanera;C. Buratti;F. Cotana;G. Bidini;F. Fantozzi
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文献类型：
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作者：
P. Bartocci;A. Anca-Couce;K. Slopiecka;S. Nefkens;N. Ević;S. Retschitzegger;M. Barbanera;C. Buratti;F. Cotana;G. Bidini;F. Fantozzi
甘油是生物柴油生产的一种联产化合物，具有有趣的加热价值。通过热重分析，得到了质量分数为90%的木屑和质量分数为10%的甘油的热解动力学参数。采用了一种新的四组分(纤维素、半纤维素、木质素和甘油)的平行反应方案，并对这种特殊的球团进行了模型拟合，得到了每一组分的动力学三元组。采用等转化率方法KisSinger-Akahira-Sunose为模型拟合模拟提供初始值，并检验最终结果。结果表明，半纤维素的活化能和指前因子分别为149.7×1011S−1和1.98×1011S−1，纤维素为230.1×1017S−1和1.84×1017S−1，木质素为154.3×109S−1和5.14×109S−1，甘油为74.5kJ−1和2.17×105S−1，除木质素外，其余组分均为一级反应。通过放出气体分析，证明了球团中甘油的热降解可以增加热解气体中的氢含量。
Glycerol is a co-product compound of biodiesel production with an interesting heating value. In this work pyrolysis kinetic parameters for a pellet made with a mass fraction of 90% sawdust and a mass fraction of 10% glycerol are derived through thermogravimetric analysis. A new parallel reaction scheme with four components (cellulose, hemicellulose, lignin and glycerol) is adopted and the kinetic triplet for each component is derived using a model fitting approach applied to this particular kind of pellet. The isoconversional method Kissinger-Akahira-Sunose is employed both to provide initial values for model fitting simulations and to check final results. Results show that activation energies and pre-exponential factors are respectively: 149.7 kJ mol−1and 1.98*1011s−1for hemicellulose, 230.1 kJ mol−1and 1.84*1017s−1for cellulose, 154.3 kJ mol−1and 5.14*109s−1for lignin, 74.5 kJ mol−1and 2.17*105s−1for glycerol with a first reaction order for all components, except for lignin (n = 2.6). Through evolved gas analysis it was demonstrated that the thermal degradation of glycerol contained in the pellet can increase hydrogen content in pyrolysis gases.