Thermal management of highly exothermic Fischer‐Tropsch synthesis (FTS) has been a challenging bottleneck limiting the radial dimension of the packed‐bed (PB) reactor tube to 1.5 in. ID. A computational demonstration of a novel microfibrous entrapped cobalt catalyst (MFECC) in mitigating hot spot formation has been evaluated. Specifically, a two‐dimensional (2‐D) model was developed in COMSOL^®, validated with experimental data and subsequently employed to demonstrate scale‐up of the FTS bed from 0.59 to 4 in. ID. Significant hot spot of 102.39 K in PB was reduced to 9.4 K in MFECC bed under gas phase at 528.15 K and 2 MPa. Improvement in heat transfer within the MFECC bed facilitates higher productivities at low space velocities (≥1000 h⁻¹) corresponding to high CO conversion (≥90%). Additionally, the MFECC reactor provides an eightfold increase in the reactor ID at hot spots ≤ 30 K with CO% conversions ≥ 90%. This model was developed for a typical FTS cobalt‐based catalyst where CO₂ production is negligible. © 2017 American Institute of Chemical Engineers AIChE J, 64: 1723–1731, 2018

中文翻译：

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微纤维夹带钴催化剂费-托反应器床的多维建模

高放热费-托合成（FTS）的热管理一直是一个具有挑战性的瓶颈，将填充床（PB）反应器管的径向尺寸限制为1.5 in。ID。已评估了新型微纤维夹带钴催化剂（MFECC）在缓解热点形成方面的计算结果。具体地讲，一个二维（2-d）模型在COMSOL开发^®，与实验数据进行了验证，并随后用来证明规模放大床0.59〜英寸ID 4的FTS的。在气相下在528.15 K和2 MPa下，MFECC床中PB的显着热点降低到9.4 K，到9.4K。MFECC床内传热的改善促进了低空速（≥1000h ^-1时）的更高生产率）对应高的CO转化率（≥90％）。此外，MFECC反应器在热点≤30 K且CO％转化率≥90％的情况下，将反应器ID增加了八倍。该模型是针对典型的FTS钴基催化剂开发的，其中CO _2的产量可忽略不计。©2017美国化学工程师学会AIChE J，64：1723–1731，2018