Assessing the performance of an industrial SBCR for Fischer–Tropsch synthesis: Experimental and modeling
Assessing the performance of an industrial SBCR for Fischer–Tropsch synthesis: Experimental and modeling
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评估费托合成工业 SBCR 的性能：实验和建模
DOI：
10.1002/aic.14931
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发表时间：
2015
期刊：
影响因子：
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通讯作者：
Yi Cheng
中科院分区：
文献类型：
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作者：
Laurent Sehabiague;Omar M. Basha;Ye;B. Morsi;Zhansheng Shi;Haolin Jia;Lien‐Chun Weng;Zhuowu Men;Ke Liu;Yi Cheng
本研究的主要目的是预测工业规模（ID = 5.8 m）浆态鼓泡塔反应器（SBCR）使用铁基催化剂进行费托（FT）合成的性能，重点是催化剂失活。为了实现这一目标，开发了一个综合反应器模型，其中包含流体动力学和传质参数（持气率，eG，气泡的索特平均直径，d32，和体积液体侧传质系数，kLa）、费托以及水煤气变换反应动力学。 He/N2 气体混合物（作为 H2/CO 的替代物）的流体动力学和传质参数是在同一反应器生产的实际熔融 FT 反应器蜡中获得的。这些数据是在中试规模 (0.29 m) SBCR 中在不同压力 (4–31 bar)、温度 (380–500 K)、表观气体速度 (0.1–0.3 m/s) 和铁基催化剂浓度 (0–45 wt%) 下测量的。对数据进行建模并将预测相关性纳入反应器模型中。然后使用反应器模型研究催化剂浓度和反应器长径比 (L/D) 对水分压的影响，水分压主要负责铁催化剂失活、H2 和 CO 转化以及 C5+ 产物收率。本研究中研究的工业 SBCR 的模拟结果表明：(1) 水分压应保持在 3 bar 以下，以最大限度地减少所用铁基催化剂的失活； (2)催化剂浓度对气含率和反应器性能的影响远大于反应器高度； (3)反应器应在 L/D 为 4.48 且催化剂浓度为 22 wt% 的动力学控制状态下运行，以最大化 C5+ 产物收率，同时最小化铁催化剂失活。在此条件下，H2和CO转化率分别为49.4%和69.3%，C5+产品产量为435.6吨/天。 © 2015 美国化学工程师学会 AIChE J, 61: 3838–3857, 2015
The main objective of this study is to predict the performance of an industrial-scale (ID = 5.8 m) slurry bubble column reactor (SBCR) operating with iron-based catalyst for Fischer–Tropsch (FT) synthesis, with emphasis on catalyst deactivation. To achieve this objective, a comprehensive reactor model, incorporating the hydrodynamic and mass-transfer parameters (gas holdup, eG, Sauter-mean diameter of gas bubbles, d32, and volumetric liquid-side mass-transfer coefficients, kLa), and FT as well as water gas shift reaction kinetics, was developed. The hydrodynamic and mass-transfer parameters for He/N2 gaseous mixtures, as surrogates for H2/CO, were obtained in an actual molten FT reactor wax produced from the same reactor. The data were measured in a pilot-scale (0.29 m) SBCR under different pressures (4–31 bar), temperatures (380–500 K), superficial gas velocities (0.1–0.3 m/s), and iron-based catalyst concentrations (0–45 wt %). The data were modeled and predictive correlations were incorporated into the reactor model. The reactor model was then used to study the effects of catalyst concentration and reactor length-to-diameter ratio (L/D) on the water partial pressure, which is mainly responsible for iron catalyst deactivation, the H2 and CO conversions and the C5+ product yields. The modeling results of the industrial SBCR investigated in this study showed that (1) the water partial pressure should be maintained under 3 bars to minimize deactivation of the iron-based catalyst used; (2) the catalyst concentration has much more impact on the gas holdup and reactor performance than the reactor height; and (3) the reactor should be operated in the kinetically controlled regime with an L/D of 4.48 and a catalyst concentration of 22 wt % to maximize C5+ products yield, while minimizing the iron catalyst deactivation. Under such conditions, the H2 and CO conversions were 49.4% and 69.3%, respectively, and the C5+ products yield was 435.6 ton/day. © 2015 American Institute of Chemical Engineers AIChE J, 61: 3838–3857, 2015