Application of New Inflection Point Method for Hydrodynamics Study in Slurry Bubble Column Reactors

Authors

  • Ali Reza Rouhi Institute of Environmental Engineering, Advanced Technologies and Sustainable Development, Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box. 51335 1996 Tabriz, I.R. IRAN
  • Esmaeil Fatehifar Institute of Environmental Engineering, Advanced Technologies and Sustainable Development, Faculty of Chemical Engineering, Sahand University of Technology, P.O. Box. 51335 1996 Tabriz, I.R. IRAN
  • Leyla Khazini Department of Chemical Engineering, Faculty of Chemistry, Tabriz University, Tabriz, I.R. IRAN
Abstract:

Bubble column reactors are used in a wide variety of applications such as multiphase bioreactors, catalytic slurry reactors, and absorption processes. The superficial gas velocity-gas holdup relationship and transition point are two important parameters for characterizing the hydrodynamics of a bubble column reactor. In this study, systematic investigation of a nitrogen - water - glass beads bubble column was conducted using the Taguchi experimental design method. The L16 (45) orthogonal array was selected for experiments design. Results showed that the order of importance of parameters is as follows: bed porosity, the ratio of height to diameter, and superficial gas velocity. A novel mathematical model was developed using the experimental data and based on 4th order polynomial. This model was successfully used to obtain the transition point with a high accuracy. The results of the mathematical method were in close agreement with those of the drift flux method. For liquid level of H=12D and slurry content of 13 vol%, transition velocity of  2.98 cm/s was calculated using the presented method, while a velocity of 3.14 cm/s  was obtained from the drift flux method.  

Upgrade to premium to download articles

Sign up to access the full text

Already have an account?login

similar resources

application of new inflection point method for hydrodynamics study in slurry bubble column reactors

bubble column reactors are used in a wide variety of applications such as multiphase bioreactors, catalytic slurry reactors, and absorption processes. the superficial gas velocity-gas holdup relationship and transition point are two important parameters for characterizing the hydrodynamics of a bubble column reactor. in this study, systematic investigation of a nitrogen - water - glass beads bu...

full text

CFD Hydrodynamics Analysis of Syngas Flow in Slurry Bubble Column

In this paper, a CFD model of syngas flow in slurry bubble column was developed. The model is based on an Eulerian-Eulerian approach and includes three phases: slurry of solid particles suspended in paraffin oil and syngas bubbles. Numerical calculations carried out for catalyst particles, bubble coalescence and breakup included bubble-fluid drag force and interfacial area effects. Also, the ef...

full text

cfd hydrodynamics analysis of syngas flow in slurry bubble column

in this paper, a cfd model of syngas flow in slurry bubble column was developed. the model is based on an eulerian-eulerian approach and includes three phases: slurry of solid particles suspended in paraffin oil and syngas bubbles. numerical calculations carried out for catalyst particles, bubble coalescence and breakup included bubble-fluid drag force and interfacial area effects. also, the ef...

full text

Modeling of the Fischer–Tropsch synthesis in slurry bubble column reactors

A multicomponent one-dimensional dynamic mathematical model for the reacting slurry systems with a change in gas flow rate due to the chemical reaction is developed. A change in gas flow rate caused by the chemical reaction is modeled using the overall gas mass balance. Thus, all relevant chemical species are included in the model. Linear first-order reaction kinetics is considered. The gas pha...

full text

Mixing in Bubble Column and Airlift Reactors

M ixing behavior of three geometrically equivalent 0.06 m bubble column and airlift photobioreactors was compared for use in microalgal culture. Mixing was characterized in terms of the axial dispersion coefficient, mixing time, circulation time and Bodenstein number. Measurements were reported in tap water and sea water, as used in growing microalgal biomass. Compared with the two airlift reac...

full text

Commercial scale slurry bubble column reactor optimization

An in-depth numerical study has been carried out to investigate a high-pressure commercial scale (2–8 meter diameter) slurry bubble column reactor (SBCR). Typical superficial gas velocities are in the range of 0.5–3 m/s, and overall vapor hold-ups are in the range of 0.45–0.85. The study revealed that steady compartmental reaction models do not match plant data when reaction time constants are ...

full text

My Resources

Save resource for easier access later

Save to my library Already added to my library

{@ msg_add @}


Journal title

volume 32  issue 2

pages  81- 92

publication date 2013-06-01

By following a journal you will be notified via email when a new issue of this journal is published.

Hosted on Doprax cloud platform doprax.com

copyright © 2015-2023