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首页> 外文期刊>Powder Technology: An International Journal on the Science and Technology of Wet and Dry Particulate Systems >Flow characteristics of circulating fluidized beds near terminal velocity: Eulerian model of a lab-scale apparatus
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Flow characteristics of circulating fluidized beds near terminal velocity: Eulerian model of a lab-scale apparatus

机译：循环流化床循环流化床的流动特性：实验室尺度装置的欧拉模型

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摘要

The hydrodynamic characteristics of gas and solid flows in circulating fluidized beds (CFB) can also influence other processes. To investigate various features of flows and mass circulation in CFB, a computational study was performed with the support of experiments measured in the riser section of a lab-scale apparatus of CFB. The fluidization velocity was slightly below the terminal velocity to avoid a major solid entrainment. The Gidaspow's model was used to calculate the gas-solid drag term in computational cells, which led to a good agreement with the experimental data of pressure profile. The gas inlet conditions were shown to be uninfluential in the hydrodynamics of major part of the upper riser, and the solid inlet (return) imposed non-uniformity in radial and tangential directions. The time-averaged profiles presented a good indication of the wall layer formation.. The rate of circulating mass in the riser from simulations was obtained 25% lower than the experiments. The coefficient of restitution was a parameter with notable influence on the hydrodynamics and the present study suggests that a variable coefficient of restitution in Eulerian models can describe the behavior of CFB system more accurately. (C) 2018 Elsevier B.V. All rights reserved.
机译：气体和固体流动在循环流化床（CFB）中的流体动力学特性也可以影响其他方法。为了研究CFB中流动和质量循环的各种特征，通过在CFB的实验室测量装置的提升装置中测量的实验进行计算。流化速度略低于端子速度，以避免主要的固体夹带。 GIDASPOW的模型用于计算计算单元中的气体固体阻力项，这导致了与压力分布的实验数据吻合良好。在上提升管的主要部分的流体动力学中显示出气体入口条件，并且在径向和切向方向上施加不均匀性的固体入口（返回）。时间平均型材呈现出壁层形成的良好指示。从模拟中的提升管中的循环质量速率比实验低25％。恢复系数是对流体动力学影响的参数，目前的研究表明，欧拉模型中的变量恢复系数可以更准确地描述CFB系统的行为。 （c）2018 Elsevier B.v.保留所有权利。

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