Development of a Variable Activation Energy Model for Biomass Devolatilization
Development of a Variable Activation Energy Model for Biomass Devolatilization
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DOI：
10.1021/ef9001499
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发表时间：
2009-04
期刊：
影响因子：
5.3
通讯作者：
E. Biagini;L. Guerrini;C. Nicolella
中科院分区：
文献类型：
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作者：
E. Biagini;L. Guerrini;C. Nicolella
在这项工作中使用了热重天平来表征不同类别的生物质燃料：残留物(稻壳、橄榄饼、可可壳)、木材(杨树、山毛榉、颗粒)和草(稻草)。升温速率的影响在10−80K/min的范围内被评估，为燃料的指纹图谱提供了重要的参数。动力学参数由传统的等转化率方法得到。活化能与转化率的关系揭示了生物质脱挥发的多步性。虽然平均值可以比较不同燃料的反应活性，但一级反应模型很难预测整个转化率范围内的生物质脱挥发。在动力学分析结果的基础上，建立了生物质脱挥发变活化能模型，保持了简单的动力学方案。在整个温度范围内，所有HR运行中的生物质残留量都得到了很好的一致。那个M..。
A thermogravimetric balance is used in this work to characterize different classes of biomass fuels: residues (rice husks, olive cake, cacao shells), woods (poplar, beech, pellets), and grasses (mischantus). The effect of the heating rate is evaluated in the range 10−80 K/min providing significant parameters for the fingerprinting of the fuels. Kinetic parameters are obtained by applying traditional isoconversional methods. The activation energy as a function of the conversion reveals the multistep nature of the biomass devolatilization. Although average values allow the reactivity of different fuels to be compared, a first-order reaction model can hardly predict the biomass devolatilization in the whole range of conversions. A VEB (variable activation energy model for biomass devolatilization) model is developed, based on the results of the kinetic analysis, maintaining a simple kinetic scheme. A good agreement is obtained for the biomass residues in all HR runs in the entire range of temperatures. The m...