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首页> 外文期刊>International Journal of Heat and Mass Transfer >Modeling Of Axial Bed-to-wall Heat Transfer In A Cfb Combustor With Abrupt Riser Exit Geometry
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Modeling Of Axial Bed-to-wall Heat Transfer In A Cfb Combustor With Abrupt Riser Exit Geometry

机译：具有突然上升出口几何形状的Cfb燃烧器中轴向床对壁传热的建模

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摘要

The shape of the riser exit geometry in a circulating fluidized bed (CFB) combustor influences the hydrodynamics of the riser column in the exit region and into the riser column to a considerable length. In the present work, the change in axial hydrodynamics for two different riser exit shapes under different operating conditions is examined to predict the corresponding axial heat transfer coefficients. The influence of the two riser exit shapes (smooth and abrupt) on the axial voidage profile is estimated using the core-annulus mass flux balance model and the corresponding axial bed-to-wall heat transfer coefficient is estimated using the cluster renewal mechanistic model. The results are reported for different hydrodynamic relations and operating parameters. The analysis provides fundamental understanding on the influence of the riser exit geometry on the axial heat transfer characteristics of the CFB combustor.
机译：循环流化床（CFB）燃烧器中立管出口几何形状的形状会影响立管柱在出口区域并进入立管柱的流体动力学到相当长的时间。在目前的工作中，研究了两种不同立管出口形状在不同工况下的轴向流体动力学变化，以预测相应的轴向传热系数。使用芯环质量通量平衡模型估算了两个立管出口形状（光滑和突变）对轴向空隙轮廓的影响，并使用簇更新机制模型估算了相应的轴向床对壁传热系数。报告了不同流体动力学关系和运行参数的结果。该分析提供了对立管出口几何形状对CFB燃烧器轴向传热特性的影响的基本理解。

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