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首页> 外文期刊>International journal of green energy >TWO-PHASE TRANSPORT MODEL FOR THE PYROLYSIS PROCESS OF A VERTICAL WOOD CYLINDER, INCLUDING THE SURROUNDING FLOW FIELD
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TWO-PHASE TRANSPORT MODEL FOR THE PYROLYSIS PROCESS OF A VERTICAL WOOD CYLINDER, INCLUDING THE SURROUNDING FLOW FIELD

机译：垂直木缸热解过程的两相输运模型

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This paper describes a mathematical model for the pyrolysis of a small dry pine wood cylinder. The computational domain is axisymmetric and involves the heating chamber, with the wood cylinder vertically situated in the centre of the chamber. The model simulates the laminar flow around the particle and the laminar flow inside the wood/char matrix by applying a two-phase transport model where the solid wood/char matrix acts as one phase and the various gases produced from the pyrolysis process is assembled in the other phase. Convective, conductive and thermal radiation transfer modes are included in the model. A two-step pyrolysis reaction scheme is used for the modelling of the conversion from wood to tar and gas. Both the thermal conductivity and the permeability of the wood/char matrix are modelled anisotropically in order to capture the directional differences in heat and mass transport, existing in real wood. Results from simulations are compared with measurements from literature for the centre core solid temperature and the conversion from wood to char, tar and pyrolysis gas in the particle during heating. The results show very good agreement with the measured temperature profile. The simulated conversion profile shows an overall good agreement with the measurements, however with discrepancies in the early stage of the process. Besides the successful validation with the experimental data, it provides us with all the details of the distribution of the migrating pyrolysis gas and tar, the temperature, the velocity flow field and pressure in the wood/char cylinder.
机译：本文描述了一个小的干燥松木圆筒热解的数学模型。计算域是轴对称的，并涉及加热室，木圆柱体垂直位于加热室的中心。该模型通过应用两相输运模型来模拟颗粒周围的层流和木材/炭基质内部的层流，在该模型中，实木/炭基质为一相，并且将热解过程中产生的各种气体聚集在其中。其他阶段。该模型包括对流，传导和热辐射传输模式。两步热解反应方案用于模拟从木材到焦油和天然气的转化。各向异性地对木材/炭基体的导热性和渗透性进行建模，以捕获真实木材中存在的传热和传质方向差异。将模拟结果与文献中的测量结果进行比较，以得出中心核心固体温度以及加热过程中颗粒中从木材到炭，焦油和热解气体的转化率。结果显示与测得的温度曲线非常吻合。模拟的转换配置文件显示与测量总体上良好的一致性，但是在过程的早期存在差异。除了成功地通过实验数据进行验证之外，它还为我们提供了迁移的热解气和焦油的分布，温度，速度流场和木材/炭缸中的压力的​​所有详细信息。

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