Computational Fluid Dynamics Modeling of Radiation in a Steam Methane Reforming Fixed-Bed Reactor,Industrial & Engineering Chemistry Research

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Computational Fluid Dynamics Modeling of Radiation in a Steam Methane Reforming Fixed-Bed Reactor
Industrial & Engineering Chemistry Research ( IF 3.8 ) Pub Date : 2019-07-25 , DOI: 10.1021/acs.iecr.9b01265
Gregor D. Wehinger _{1,

2} , Steffen Flaischlen _{1,

2}

Affiliation

Fixed-bed reactors for steam reforming of methane (SRM) operate under high pressure, temperature, and Reynolds numbers. In this study, the entrance region of a SRM fixed-bed reactor is simulated with particle-resolved computational fluid dynamics (CFD) simulations under two flow conditions (Re_p = 755 and 7554). Thermal radiation effects are modeled in detail by surface-to-surface (S2S) radiation and energy-absorbing gas-phase species (discrete ordinate method (DOM)). Taking radiation into account leads to an increase in local temperatures of up to 40 K and to a total hydrogen production 70% larger than that found by neglecting radiation. However, the DOM and the S2S model do not show large differences in local temperature and gas-phase composition prediction. The comparison of computational costs gives a recommendation for modeling thermal radiation in packed beds: the S2S model is to be preferred over the DOM radiation model, which need 7.5% and 35% additional calculation time in comparison to the model neglecting radiation, respectively.

中文翻译：

蒸汽甲烷重整固定床反应器中辐射的计算流体动力学建模

用于甲烷蒸汽重整（SRM）的固定床反应器在高压，高温和雷诺数下运行。在这项研究中，SRM固定床反应器的入口区域是在两种流动条件下（Re _p= 755和7554）。通过表面对表面（S2S）辐射和吸收能量的气相物质（离散方法（DOM））对热辐射效果进行了详细建模。考虑到辐射会导致局部温度升高多达40 K，并且总氢产量比忽略辐射所产生的总氢产量高70％。但是，DOM和S2S模型在局部温度和气相组成预测中并未显示出较大差异。计算成本的比较为建模填充床中的热辐射提供了建议：与DOM辐射模型相比，S2S模型更为可取，与忽略辐射的模型相比，DOM辐射模型分别需要7.5％和35％的额外计算时间。

更新日期：2019-07-25

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