Kinetics of Biomass Pyrolysis: a Reformulated Three-Parallel-Reactions Model
Kinetics of Biomass Pyrolysis: a Reformulated Three-Parallel-Reactions Model
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DOI：
10.1021/ie020218p
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发表时间：
2003-02
影响因子：
4.2
通讯作者：
J. Manyà;A. Velo;L. Puigjaner
中科院分区：
文献类型：
--
作者：
J. Manyà;A. Velo;L. Puigjaner
采用热重分析法研究了蔗渣和废木材样品的热分解过程。假设加入三个独立的平行分解，分别对应于半纤维素、纤维素和木质素的三种假组分，模拟热解过程的失重。首先，假设每个假组分都有一个不可逆的一级反应模型。结果表明，模型模拟曲线与实验数据拟合较差。因此，对纯木质素（Kraft碱木质素）进行了进一步的动力学研究，结果表明木质素的热解更适合用三级反应速率定律来描述。木质素动力学模型的重新表述，以及随后在总合模型（第三个伪组分）中的实施，使模拟数据和实验数据之间达到了很好的一致性。
The thermal decompositions of sugarcane bagasse and waste-wood samples are studied using thermogravimetric analysis. Assuming the addition of three independent parallel decompositions, these corresponding to three pseudocomponents linked to the hemicellulose, cellulose, and lignin, the weight loss associated with the pyrolysis process is simulated. First, an irreversible first-order reaction model is assumed for each pseudocomponent. Results show that the model-simulated curves do not fit well to the experimental data. Consequently, a further kinetic study is carried out for the pure lignin (Kraft alkali lignin), which demonstrates that the pyrolysis of lignin is better described by a third-order reaction rate law. The reformulation of the lignin kinetic model, and its subsequent implementation in the summative model (for the third pseudocomponent), has allowed one to reach a good agreement between simulated and experimental data.