A 2-D Computational Fluid Dynamics (CFD) model of a Packed Bed (PB) Fischer Tropsch (FT) reactor was developed using a non-conventional Supercritical Fluid (SCF) as reaction media. The model was used to study the effect of using SCF-FT reactor bed in alleviating hot spot formation, typically occurring in conventional Gas Phase FT reactors (GP-FT). The potential of scaling-up a typical industrial 1.5-inch diameter reactor bed to a larger tube diameter (up to 4″ ID) was studied as a first step towards process intensification of the FT technology. The high fidelity 2-D model developed in this work was built on experimental data generated at a variety of FT operating conditions both in conventional GP-FT and in SCF-FT reactor bed. Results showed that the maximum temperature rise in SCF-FT for a 4″ ID bed was just 15 K compared to ˜800 K in GP-FT bed for $15\%Co/\gamma -A{l}_2{O}_3$ based catalyst at 500 GHSV and 518.15 K. The enhancement in thermal performance in SCF-FT reactor bed is attributed to the high thermal capacity of SCF media (˜2500 J/kg/K) compared to GP (˜1300 J/kg/K), which resulted in the elimination of hotspot formation. These results provide the first evidence for the application of SCF-FT in larger tube reactor beds while overcoming issues resulting from hotspot formation.

使用非常规超临界流体（SCF）作为反应介质，开发了填充床（PB）费托（FT）反应器的二维计算流体动力学（CFD）模型。该模型用于研究使用SCF-FT反应器床减轻热点形成的效果，这种现象通常发生在常规气相FT反应器（GP-FT）中。作为将FT技术工艺强化的第一步，研究了将典型的工业1.5英寸直径反应器床放大到更大管径（最大4英寸内径）的潜力。在这项工作中开发的高保真二维模型是基于在常规GP-FT和SCF-FT反应器床中各种FT操作条件下生成的实验数据建立的。$15％CØ/\gamma --\mathrm{一种}{升}_{\mathrm{2个}}{Ø}_3$催化剂在500 GHSV和518.15 K下工作。SCF-FT反应器床中热性能的提高归因于与GP相比，SCF介质的热容量高（约2500 J / kg / K）（约1300 J / kg / K） ），从而消除了热点的形成。这些结果为SCF-FT在更大的管式反应器床中的应用提供了第一个证据，同时克服了由热点形成引起的问题。