CFD and experimental studies of reactive pulsing flow in environmentally-based trickle-bed reactors

Lopes, Rodrigo J.G.; Sousa, Vera S.L. de; Quinta‐Ferreira, Rosa M.

doi:10.1016/j.ces.2011.01.058

Cited by 9 publications

(4 citation statements)

References 35 publications

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“…As in the framework of the Eulerian model, the two phases are treated mathematically as interpenetrating continua, which means there is no interface between the gas and liquid. Owing to this limitation, Lopes and Quinta‐Ferreira applied the volume‐of‐fluid model, however, quantitative results on solid wetting and liquid flow texture are not yet obtained. The failure in CFD simulation may be due to different forms of liquid that are scattered randomly in the bed, and a clear discrimination between film and rivulet is difficult, recalling that CFD simulation is based on the Navier–Stokes equation, which is only concerned with the mass and momentum conservations.…”

Section: Introductionmentioning

confidence: 99%

Hydrodynamic modeling on the external liquid–solid wetting efficiency in a trickling flow reactor

et al. 2012

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A three-region model was proposed, which considers the bed cross section being composed of a stagnant liquid region, a liquid film region, and a rivulet flow region. To estimate the fractions of the three regions, the fraction of film flow was evaluated first, by transforming the complex trickling flow texture into pure liquid film flow. Through the measurements of liquid holdup and pressure drop for the film flow, a relationship between relative permeability and gas saturation was established, and from which the fraction of film flow region was obtained. It shows packing size is most important to the faction of rivulet flow. The external wetting efficiency of the packing was correlated as the sum of two-third power of the liquid film fraction and the rivulet flow fraction, besides, a correlation based on Reynolds and Galileo numbers of the two phases in the form of ce ¼ 4.85Re 0:42 L Ga À0:25 L Re 0:083 G was proposed.

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Section: Introductionmentioning

confidence: 99%

Hydrodynamic modeling on the external liquid–solid wetting efficiency in a trickling flow reactor

et al. 2012

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Section: Introductionmentioning

confidence: 99%

“…Eulerian-based CFD computations have been able to appropriately handle the experimental data collected on pulsing flow circumstances for both bulk temperature and normalized species concentration. 22 Also, the technique was implemented to calculate the local heat transfer coefficient, which is regarded as a momentous parameter in the computation of energy transfer between the fluid and the particle in packed-bed reactors. 23,24 The objective of the current work is to extend the studies by Sadighi et al 19 to investigate the hydrodynamics, reaction kinetics, and influence of operational parameters on the reactor performance by applying a comprehensive CFD model via COMSOL package.…”

Section: Introductionmentioning

confidence: 99%

“…Computational fluid dynamics (CFD) now plays a vital role in analyzing the hydrodynamics and reaction kinetics of the multiphase systems with the development of computational technology. , It was applied to predict the performance of the pulsing flow in trickle-bed reactors. Eulerian-based CFD computations have been able to appropriately handle the experimental data collected on pulsing flow circumstances for both bulk temperature and normalized species concentration . Also, the technique was implemented to calculate the local heat transfer coefficient, which is regarded as a momentous parameter in the computation of energy transfer between the fluid and the particle in packed-bed reactors. , …”

Section: Introductionmentioning

confidence: 99%

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Computational Fluid Dynamic Modeling and Simulation of Hydrocracking of Vacuum Gas Oil in a Fixed-Bed Reactor

et al. 2020

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A four-lump computational fluid dynamic (CFD) model was proposed for the investigation of vacuum gas oil hydrocracking in a trickle-bed reactor. The experiment was conducted at 360–390 °C and 146 bar in the reactor at three different flow rates. It was found that the modeling predictions of vacuum gas oil cracking agreed well with the experimental measurements. Furthermore, the developed model analyzed the effects of the feed flow rate in the reactors on the concentration distribution and product yield. The maximum yields of the products including distillate (31%), naphtha (14%), and gas (3%) were obtained at the lowest feed flow rate. However, the feed flow rate enhancement from 0.1568 to 0.2059 kg·h –1 led to the increasing feed concentration and reducing the product concentration at the outlet of the reactor. The latter phenomenon was happened due to the decreasing feed residence time with the increasing mass flow rate.

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A two-dimensional discrete lumped model for a trickle-bed vacuum gas oil hydrocracking reactor

Sadighi¹

2016

Korean J. Chem. Eng.

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A two-dimensional (2D) computational fluid dynamics model based on discrete lumping approach was used to predict the product yields of a pilot scale vacuum gas oil (VGO) hydrocracking reactor. This model was developed by solving mass conservation equations in conjunction with the continuity and momentum balances in the z-r cylindrical plane. The kinetic parameters of the model were estimated from the experimental data, and validated by using actual values. Results show that the proposed model can appreciably improve the accuracy of the yield prediction in comparison to the predicted value using the 1D model. Moreover, it is confirmed that the order of magnitude of the radial liquid velocity against the axial one is considerably low, and there is no significant pressure drop along the r-direction. Additionally, results show that two-dimensional model is a reliable tool for evaluating the catalyst performance and also for designing commercial reactors.

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CFD and experimental studies of reactive pulsing flow in environmentally-based trickle-bed reactors

Cited by 9 publications

References 35 publications

Hydrodynamic modeling on the external liquid–solid wetting efficiency in a trickling flow reactor

Hydrodynamic modeling on the external liquid–solid wetting efficiency in a trickling flow reactor

Computational Fluid Dynamic Modeling and Simulation of Hydrocracking of Vacuum Gas Oil in a Fixed-Bed Reactor

A two-dimensional discrete lumped model for a trickle-bed vacuum gas oil hydrocracking reactor

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