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首页> 外文期刊>Combustion Science and Technology >INFINITE- VERSUS FINITE-RATE KINETICS IN SIMPLIFIED MODELS OF WOOD PYROLYSIS
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INFINITE- VERSUS FINITE-RATE KINETICS IN SIMPLIFIED MODELS OF WOOD PYROLYSIS

机译：木材热解简化模型中的无穷与有限速率动力学

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摘要

A comprehensive mathematical model of wood pyrolysis, based on the unreacted-core-shrinking approximation, is used to assess the role played by the description of the kinetics for a one-step global reaction. The more accurate model, which was previously subjected to experimental validation, includes a first-order Arrhenius rate, whereas the simplified one uses the assumption of constant (assigned) temperature, T_p, at the pyrolysis front. Both models predict qualitatively similar particle dynamics. Extensive simulations, carried out by varying the parameters of the kinetic models, the external heating conditions, and the particle size, indicate that the unknown parameter T_p, though comprised in the range of experimental values, should not be chosen coincident with the pyrolysis temperatures predicted by the finite-rate model. However, a range of T_p values can be determined that produces chief process characteristics, such as maximum devolatilization rate and conversion time, very close to those of the finite-rate model. In this way, acceptable agreement is also obtained between predicted and measured integral and differential mass loss curves of thick wood exposed to radiative heating.
机译：基于未反应核收缩的近似值，木材热解的综合数学模型用于评估动力学描述对一步全局反应的作用。之前经过实验验证的更精确的模型包括一阶Arrhenius速率，而经过简化的模型则使用了在热解前沿恒定（指定）温度T_p的假设。两种模型都预测质的动力学相似。通过改变动力学模型的参数，外部加热条件和颗粒尺寸进行的广泛模拟表明，未知参数T_p尽管包含在实验值范围内，但不应与预测的热解温度相一致地选择通过有限速率模型。但是，可以确定产生主要过程特征的T_p值范围，例如最大脱挥发分速率和转化时间，非常接近有限速率模型的特征。以这种方式，在暴露于辐射加热的厚木的预测和测量的积分和微分质量损失曲线之间也获得了可接受的一致性。

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