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首页> 外文期刊>International Journal of Heat and Mass Transfer >A comprehensive dual-scale wood torrefaction model: Application to the analysis of thermal run-away in industrial heat treatment processes
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A comprehensive dual-scale wood torrefaction model: Application to the analysis of thermal run-away in industrial heat treatment processes

机译：全面的双尺度木材焙烧模型：在工业热处理过程中的热失控分析中的应用

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摘要

A dual-scale model of the torrefaction of wood was developed and used to study industrial configurations. At the local scale, the computational code solves the coupled heat and mass transfer and the thermal degradation mechanisms of the wood components. At the global scale, the two-way coupling between the boards and the stack channels is treated as an integral component of the process. This model is used to investigate the effect of the stack configuration on the heat treatment of the boards. The simulations highlight that the exothermic reactions occurring in each single board can be accumulated along the stack. This phenomenon may result in a dramatic heterogeneity of the process and poses a serious risk of thermal runaway, which is often observed in industrial plants. The model is used to explain how thermal runaway can be lowered by increasing the airflow velocity, the sticker thickness or by gas flow reversal.
机译：开发了木材烘烤的双尺度模型，并用于研究工业结构。在本地范围内，计算代码解决了木材组件耦合的传热传质和热降解机理。在全球范围内，板与堆叠通道之间的双向耦合被视为该过程的组成部分。该模型用于研究堆叠结构对板热处理的影响。仿真结果表明，每个单板中发生的放热反应可以沿堆栈累积。这种现象可能会导致过程的巨大异质性，并带来严重的热失控风险，这在工业工厂中经常会观察到。该模型用于说明如何通过增加气流速度，贴纸厚度或通过逆流来降低热失控。

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