Numerical modelling of biomass pyrolysis in a packed bed reactor conducted with heating rate 1073 K/h was performed in this study. The devised modelling is a very effective way to analyse and evaluate physical phenomena for designing and optimizing pyrolysis process.. As the shape of wood used was in the form of powder, the multi-phase flow was simulated using the heat transfer in porous medium and fluid flow. It was coupled to describe the pyrolysis process of woody biomass in a packed bed. Due to thermal effect being the most crucial matter in the designing of reactor, this work investigated the temperature and velocity distribution during the process. Besides, this study made predictions in other biomass feedstocks; bamboo and bark. The experimental data were obtained by means of a laboratory-scale real pilot plant in the packed bed furnace. The pyrolysis process lasted for 120 min. The temperature variations for investigating the thermal effects in pyrolysis process took place from 523 K to 923 K with heat source on the furnace wall. The numerical modelling indicated a good agreement between the experimental and calculated results in their validation. The pyrolysis temperature had the greatest effect on the heat and mass distribution during the process influencing the product yield and the direction of experimental heat transfers in the biomass packed bed were confirmed well by surface contour temperature with the calculated numerical model. However, there were slight differences due to water evaporation and heat reaction strongly influencing the heat transfers in the packed bed, affecting the absorption of heat energy in the pyrolysis process. In addition, the chemical properties of wood components greatly affected their physical properties, mostly influencing the heat transfers in the packed bed which dominantly occurred as thermal conduction. This had an impact on the amount of heat capacity of each feedstocks. Among the biomass feedstocks, the calculated results shows that the distribution temperature of bamboo was the highest in the study due to its properties.

本研究对填充床反应器中的生物质热解进行了数值模拟，加热速率为 1073 K/h。设计的模型是分析和评估物理现象以设计和优化热解过程的一种非常有效的方法。由于所用木材的形状为粉末形式，因此使用多孔介质中的传热模拟多相流和流体流动。结合描述木质生物质在填充床中的热解过程。由于热效应是反应器设计中最关键的因素，本工作研究了该过程中的温度和速度分布。此外，本研究对其他生物质原料进行了预测；竹子和树皮。实验数据是通过填充床炉中实验室规模的真实中试设备获得的。热解过程持续120分钟。用于研究热解过程中热效应的温度变化发生在 523 K 到 923 K 之间，热源位于炉壁上。数值模拟表明实验和计算结果在验证中具有良好的一致性。在影响产品收率的过程中，热解温度对热量和质量分布的影响最大，并且通过计算数值模型的表面轮廓温度很好地确定了生物质填充床中实验传热的方向。然而，由于水分蒸发和热反应强烈影响填充床中的传热，影响热解过程中热能的吸收，因此存在细微差别。此外，木材成分的化学性质极大地影响了它们的物理性质，主要影响填充床中的热传递，主要以热传导的形式发生。这对每种原料的热容量有影响。在生物质原料中，计算结果表明，由于其特性，竹子的分布温度在研究中最高。