Abstract In this study, computational fluid dynamics (CFD) was applied for simulating the hydrodynamics and chemical kinetics for the fluidized bed biomass fast pyrolysis. Based on the Euler-Euler multiphase framework, standard K-e model and Finite-Rate/Eddy-Dissipation model were selected for the viscous and the species transport model, respectively. Syamlal O’brien model and Arrhenius kinetic model were chosen as the drag and reaction kinetics model, respectively. The volume fractions as well as the temperature distributions of the fluidizing gas, biomass and fluidizing sand at the fluidization velocity of 0.6 m/s were numerically observed. The simulation of the reaction temperature influence on product yield agreed well with the lab-scale experimental results. The distributions of the gas products show that CO and H2 are mostly at the lower part of the reactor, CH4 is in the freeboard region and CO2 is at both the reaction and freeboard zone. The proposed CFD model was expected to make contributions for improving the internal process and reactor optimization for biomass fluidized bed fast pyrolysis.

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通过计算流体动力学对流化床快速热解生物质进行数值模拟

摘要 在本研究中，计算流体动力学（CFD）被用于模拟流化床生物质快速热解的流体动力学和化学动力学。基于Euler-Euler多相框架，粘性和物种输运模型分别选择了标准Ke模型和Finite-Rate/Eddy-Dissipation模型。Syamal O'brien 模型和 Arrhenius 动力学模型分别被选为阻力和反应动力学模型。数值观察了流化气、生物质和流化砂在流化速度为0.6 m/s时的体积分数和温度分布。反应温度对产物收率影响的模拟与实验室规模的实验结果非常吻合。气体产物分布表明，CO和H2主要在反应器下部，CH4在干舷区，CO2在反应区和干舷区。所提出的 CFD 模型有望为改进生物质流化床快速热解的内部工艺和反应器优化做出贡献。