A Simplified Pyrolysis Model of a Biomass Particle Based on Infinitesimally Thin Reaction Front Approximation

Y. Haseli; J. A. van Oijen; L. P. H. de Goey

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A Simplified Pyrolysis Model of a Biomass Particle Based on Infinitesimally Thin Reaction Front Approximation

机译：基于无限薄反应锋面逼近的生物质颗粒简化热解模型

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This paper presents a simplified model for prediction of pyrolysis of a biomass particle. The main assumptions include (l) decomposition of virgin material in an infinitesimal thin reaction front at a constant pyrolysis temperature, (2) constant thermophysical properties throughout the process, (3) negligible effect of volatiles flow. The formulation is presented for various stages of thermally thin and thermally thick slab particles. In each phase, the energy conservation is applied for the particle in a simple enthalpy balance form and the enthalpy of particle is computed at a volumetric mean temperature. The accuracy of this new model has been examined by comparing the predictions with various experiments of slab particles found in the literature as well as the predictions of a comprehensive model, in terms of mass loss rate, surface and internal temperatures, and conversion time. The results show that the model prediction is qualitatively and quantitatively in a satisfactory agreement with measured values. Comparing the outcome of the simplified model and a comprehensive model in terms of the conversion time of beech and spruce wood particles at high external heat fluxes reveals fair agreement between these two models. These multiple validations indicate that the presented model can be employed in design codes for practical applications. Typical numerical results are further presented to highlight the effect of the prescribed pyrolysis temperature on mass loss rate and surface temperature of both thermally thick and thin particles. The extension of the model for other particle shapes is outlined.

机译：本文提出了一种用于预测生物质颗粒热解的简化模型。主要假设包括：（1）在恒定的热解温度下，在无限小的稀薄反应前沿中原始材料的分解；（2）在整个过程中恒定的热物理性质；（3）挥发物流动的影响可忽略不计。该配方针对热薄和热厚的板坯颗粒的各个阶段提供。在每个阶段，以简单的焓平衡形式将能量守恒应用于颗粒，并在体积平均温度下计算颗粒的焓。通过在质量损失率，表面和内部温度以及转化时间方面，通过比较文献中发现的与板坯颗粒各种实验的预测以及综合模型的预测，检验了该新模型的准确性。结果表明，该模型的定性和定量预测与测量值令人满意。通过比较山毛榉和云杉木材颗粒在高外部热通量下的转化时间，可以比较简化模型和综合模型的结果，发现这两个模型之间的共识很明确。这些多次验证表明，所提出的模型可以用于实际应用的设计规范中。进一步给出了典型的数值结果，以突出规定的热解温度对热稠颗粒和细颗粒两者的质量损失率和表面温度的影响。概述了模型对其他粒子形状的扩展。

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来源
《Energy & fuels》 |2012年第mayajuna期|p.3230-3243|共14页
作者
Y. Haseli; J. A. van Oijen; L. P. H. de Goey;
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作者单位

Combustion Technology, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513,;

Combustion Technology, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513,;

Combustion Technology, Department of Mechanical Engineering, Eindhoven University of Technology, P.O. Box 513;

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收录信息美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
原文格式 PDF
正文语种 eng
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关键词
c_p: specific heat, J/kg·K; rnH: enthalpy, J; rnh: convective heat transfer coefficient, W/m~2·K; rnk: thermal conductivity, W/m·K; rnL: thickness/length of particle, m et al;

机译：c_p：比热;J / kg·K;rnH：焓;J;rnh：对流传热系数;W / m〜2·K;rnk：热导率;W / m·K;rnL：颗粒的厚度/长度;等;

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A Simplified Pyrolysis Model of a Biomass Particle Based on Infinitesimally Thin Reaction Front Approximation

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