Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit

doi:10.1016/j.cjche.2018.06.023

Chinese Journal of Chemical Engineering ›› 2019, Vol. 27 ›› Issue (2): 298-304.DOI: 10.1016/j.cjche.2018.06.023

• Fluid Dynamics and Transport Phenomena • 上一篇下一篇

Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit

Eduard Manek, Juma Haydary

Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia

收稿日期:2018-02-05 修回日期:2018-05-16 出版日期:2019-02-28 发布日期:2019-03-18
通讯作者: Juma Haydary

Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit

Eduard Manek, Juma Haydary

Institute of Chemical and Environmental Engineering, Faculty of Chemical and Food Technology, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia

Received:2018-02-05 Revised:2018-05-16 Online:2019-02-28 Published:2019-03-18
Contact: Juma Haydary

摘要/Abstract

摘要： One of the commercial means to convert heavy oil residue is hydrocracking in an ebullated bed. The ebullated bed reactor includes a complex gas-liquid-solid backmixed system which attracts the attention of many scientists and research groups. This work is aimed at the calculation of the internal recycle flow rate and understanding its effect on other parameters of the ebullated bed. Measured data were collected from an industrial scale residual hydrocracking unit consisting of a cascade of three ebullated bed reactors. A simplified block model of the ebullated bed reactors was created in Aspen Plus and fed with measured data. For reaction yield calculation, a lumped kinetic model was used. The model was verified by comparing experimental and calculated distillation curves as well as the calculated and measured reactor inlet temperature. Influence of the feed rate on the recycle ratio (recycle to feed flow rate) was estimated. A relation between the recycle flow rate, pump pressure difference and catalyst inventory has been identified. The recycle ratio also affects the temperature gradient along the reactor cascade. Influence of the recycle ratio on the temperature gradient decreased with the cascade member order.

关键词: Residual hydrocracking, Ebullated bed reactor, Liquid recycle, Aspen Plus, Simulation

Abstract: One of the commercial means to convert heavy oil residue is hydrocracking in an ebullated bed. The ebullated bed reactor includes a complex gas-liquid-solid backmixed system which attracts the attention of many scientists and research groups. This work is aimed at the calculation of the internal recycle flow rate and understanding its effect on other parameters of the ebullated bed. Measured data were collected from an industrial scale residual hydrocracking unit consisting of a cascade of three ebullated bed reactors. A simplified block model of the ebullated bed reactors was created in Aspen Plus and fed with measured data. For reaction yield calculation, a lumped kinetic model was used. The model was verified by comparing experimental and calculated distillation curves as well as the calculated and measured reactor inlet temperature. Influence of the feed rate on the recycle ratio (recycle to feed flow rate) was estimated. A relation between the recycle flow rate, pump pressure difference and catalyst inventory has been identified. The recycle ratio also affects the temperature gradient along the reactor cascade. Influence of the recycle ratio on the temperature gradient decreased with the cascade member order.

Key words: Residual hydrocracking, Ebullated bed reactor, Liquid recycle, Aspen Plus, Simulation

Eduard Manek, Juma Haydary. Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit[J]. Chinese Journal of Chemical Engineering, 2019, 27(2): 298-304.

Eduard Manek, Juma Haydary. Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit[J]. Chin.J.Chem.Eng., 2019, 27(2): 298-304.

参考文献

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Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit

Investigation of the liquid recycle in the reactor cascade of an industrial scale ebullated bed hydrocracking unit

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