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Multi-physics modelling of packed bed biomass combustion

机译：填充床生物质燃烧的多物理场建模

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摘要

A transient 3D model for two main zones, namely the fuel bed and the freeboard, of biomass packed bed combustion systems was developed. It integrates the models for the biomass conversion sub-processes and solves the governing equations for the gas and solid phase and their interactions. The intra-particle gradients are included by considering the biomass particles as thermally thick particles. The shrinkage of the packed bed and the variations of the bed porosity due to the uneven consumption of the fuel are taken into account. Detailed kinetic mechanisms are used for the simulation of homogeneous gas phase reactions. To verify the model and to increase the understanding of packed bed combustion, laboratory-scale fixed-bed batch experiments have been performed in a reactor with 9.5 cm diameter and 10 cm length. The model performance was extensively validated with gas phase measurements (CO, CO_2, CH_4, H_2, H_2O and O_2) above the fuel bed, temperatures at different heights in the bed and in the freeboard, and the propagation rate of reaction front. The simulation results are in a good agreement with the measured values.
机译：针对生物质填充床燃烧系统的两个主要区域，即燃料床和干舷，建立了一个瞬态3D模型。它集成了生物质转化子过程的模型，并求解了气相和固相及其相互作用的控制方程。通过将生物质颗粒视为热稠颗粒来包括颗粒内梯度。考虑到填充床的收缩和由于燃料的不均匀消耗引起的床孔隙率的变化。详细的动力学机制用于模拟均相气相反应。为了验证模型并增加对填充床燃烧的了解，已在直径为9.5 cm，长度为10 cm的反应堆中进行了实验室规模的固定床分批实验。通过在燃料床上方的气相测量（CO，CO_2，CH_4，H_2，H_2O和O_2），床层和干舷内不同高度的温度以及反应前沿的传播速率，广泛验证了模型的性能。仿真结果与测量值非常吻合。

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  • 来源
    《Fuel》 |2014年第4期|164-178|共15页
  • 作者

    Ramin Mehrabian; Ali Shiehnejadhesar; Robert Scharler; Ingwald Obernberger;

  • 作者单位

    BIOENERCY 2020+ GmbH, Inffeldgasse 21b, 8010 Graz, Austria,Institute for Process and Particle Engineering, Graz University of Technology, Inffeldgasse 21b, 8010 Graz, Austria;

    BIOENERCY 2020+ GmbH, Inffeldgasse 21b, 8010 Graz, Austria,Institute for Process and Particle Engineering, Graz University of Technology, Inffeldgasse 21b, 8010 Graz, Austria;

    BIOENERCY 2020+ GmbH, Inffeldgasse 21b, 8010 Graz, Austria,Institute for Process and Particle Engineering, Graz University of Technology, Inffeldgasse 21b, 8010 Graz, Austria,BIOS BIOENERGIESYSTEME GmbH, Inffeldgasse 21b, 8010 Graz, Austria;

    BIOENERCY 2020+ GmbH, Inffeldgasse 21b, 8010 Graz, Austria,Institute for Process and Particle Engineering, Graz University of Technology, Inffeldgasse 21b, 8010 Graz, Austria,BIOS BIOENERGIESYSTEME GmbH, Inffeldgasse 21b, 8010 Graz, Austria;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

    Biomass; Packed bed; Combustion; CFD; Experimental validation;

    机译：生物质床铺燃烧;差价合约实验验证;

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