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Comparative evaluation of heat transfer correlations with different fluid property considerations for fixed-bed reactor modeling

机译：不同流体性能考虑因素对固定床反应器建模的比较评价

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摘要

Catalytic fixed-bed reactors are well established and frequently used in the chemical industry. Full-scale catalytic fixed-bed reactors are commonly described via pseudo-homogeneous continuum models. The heat transfer is accounted for by correlations that have been predominately fitted under the assumption of constant fluid properties. As a result of chemical reactions taking place, the fluid composition and the temperature in the fixed-bed depend on the spatial position. The resulting system specific non-uniformity of the fluid properties should be taken into account during modeling. The effect of different approaches to consider the fluid properties in the bed on the predictive performance of selected heat transfer correlations is evaluated on a broad range of experimental heat transfer data obtained from the literature. Correlations from both the α_w- and the λ_r(r)-heat transfer models were selected. Although the selected correlations have been fitted under the assumption of constant fluid properties, the predictive performance was improved for all correlations if radial and axial variations of the fluid properties were taken into account. The impact on the resulting temperature field is illustrated based on a case study. In addition, the predictive performances of the selected heat transfer correlations are compared to one another over a broad range of tube-to-particle diameter ratios and Reynolds numbers. A clear superiority of the λ_r(r)-correlation proposed by Winterberg et al. was identified.
机译：催化固定床反应器是完全和经常在化学工业中使用的。全尺寸催化固定床反应器通常通过伪均匀的连续体模型描述。通过在恒定流体性质的假设下主要安装的相关性来占传热。由于发生化学反应，流体组合物和固定床中的温度取决于空间位置。应在建模期间考虑所得的系统特异性不均匀性。在从文献中获得的广泛的实验传热数据中评估了不同方法对床中的流体性能的效果。在从文献中获得的广泛的实验传热数据评估了所选传热相关性的预测性能。选择来自α_W-和λ_R（R） - 热传输模型的相关性。尽管已经在恒定流体特性的假设下拟合所选择的相关性，但如果考虑流体性质的径向和轴向变化，则对所有相关性提高预测性能。基于案例研究，示出了对所得温度场的影响。另外，在宽范围的管粒径比率和雷诺数上将所选传热相关性的预测性能与彼此进行比较。 λ_r（r）的清晰优势 - 韦尔米尔格等人提出的胶合。被确定了。

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