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Performance of a Catalytic Gas–Solid Fluidized Bed Reactor in the Presence of Interparticle Forces

  • Jaber Shabanian und Jamal Chaouki EMAIL logo
Veröffentlicht/Copyright: 3. April 2015
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International Journal of Chemical Reactor Engineering
Aus der Zeitschrift International Journal of Chemical Reactor Engineering Band 14 Heft 1

Abstract

The influence of interparticle forces (IPFs) on the hydrodynamics of a gas–solid fluidized bed was experimentally investigated with the help of a polymer coating approach. The results showed that the presence of IPFs in the bed can considerably change the hydrodynamic parameters. The tendency of the fluidizing gas passing through the bed in the emulsion phase increased with IPFs in the bubbling regime. The performance of a fluidized bed reactor was then studied through simulation of a reactive catalytic system using three different hydrodynamic models: (a) a simple two-phase flow model, (b) a dynamic two-phase flow model, and (c) a dynamic two-phase flow model, integrating the effects of superficial gas velocity and IPFs. The simple two-phase flow model was found to underestimate the reactor performance for catalytic reaction most likely due to the oversimplified assumptions involved in this model. Also, the simulation results showed that modification of the bed hydrodynamics due to IPFs resulted in a better performance for a bubbling fluidized bed reactor. This suggests that the hydrodynamic models should take into account the effects of superficial gas velocity and variation in the ratio of the magnitude of IPFs/hydrodynamic forces, due to any operational reason, to yield a more reliable evaluation of the performance of the fluidized bed reactor.

Keywords: gas–solid fluidized bed reactor; interparticle forces; reactor simulation; two-phase flow model

Nomenclature

Subscription
CSB40

coated sugar beads at 40°C

DTPFM

dynamic two-phase flow model

HDFs

hydrodynamic forces

IPFs

interparticle forces

MAN

maleic anhydride

PEA

poly ethyl acrylate

PMMA

poly methyl methacrylate

STPFM

simple two-phase flow model

SB20

fresh sugar beads at 20°C

VPO

vanadium phosphorus oxide

Symbols
CB

concentration of n-butane (mol/L)

CB0

concentration of n-butane fed (mol/L)

Ci

mean concentration of species i (mol/L)

Ci,b

concentration of species i in the bubble phase (mol/L)

Ci,e

concentration of species i in the emulsion phase (mol/L)

CMAN

concentration of MAN (mol/L)

CO

concentration of oxygen (mol/L)

db

average bubble size (m)

dp

mean particle size (μm)

DAB

gas diffusion coefficient (m2/s)

Dc

reactor diameter (m)

fe

emulsion phase fraction (-)

g

gravity acceleration (m/s2)

H

height of reactor (m)

k1

rate constant for MAN formation (mol(1-α) Lα/(g.s))

k2

rate constant for CO2 formation (mol(1-β) Lβ/(g.s))

k3

rate constant for MAN decomposition (mol(δ-γ) L(1-δ+γ)/(g.s))

Kbc

bubble to cloud gas interchange coefficient (1/s)

Kbe

bubble to emulsion gas interchange coefficient (1/s)

KB

adsorption equilibrium constant for n-C4 in Centi et al. [48] kinetics (L/mol)

Kce

cloud to emulsion gas interchange coefficient (1/s)

P

pressure (kPa)

r1

rate of MAN formation (mol/(g.s))

r2

rate of CO2 formation (mol/(g.s))

r3

rate of MAN decomposition (mol/(g.s))

Ri,b

overall reaction rate of species i in the bubble phase (mol/(g.s))

Ri,e

overall reaction rate of species i in the emulsion phase (mol/(g.s))

S

selectivity of MAN, number of moles of MAN produced per moles of n-C4 converted (-)

T

temperature (°C)

Ub

bubble rise velocity (m/s)

Uc

transition velocity from bubbling to turbulent regime (m/s)

Uc,No−IPFs

transition velocity from bubbling to turbulent regime for a bed without IPFs (m/s)

Ug

superficial gas velocity (m/s)

Umf

minimum fluidization velocity (m/s)

Umf,SB20

minimum fluidization velocity for SB20 (m/s)

Ue

superficial gas velocity of emulsion phase (m/s)

X

conversion of n-C4, number of moles of n-C4 converted per moles of n-C4 fed (-)

yB0

feed n-C4 concentration (% v/v)

Y

yield of MAN, number of moles of MAN produced per moles of n-C4 fed (-)

z

distance above the distributor plate (m)

Greek letters
α,β,γ,δ

exponents in Centi et al. [48] rate expressions (–)

ε

local bed voidage (–)

εb

time-averaged bubble phase voidage (–)

εe

time-averaged emulsion phase voidage (–)

εmf

minimum fluidization voidage (–)

ρp

particle density (kg/m3)

Acknowledgements

The authors greatly appreciate the financial support of the Total American Services, Inc. and the National Sciences and Engineering Research Council of Canada (NSERC).

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Published Online: 2015-4-3
Published in Print: 2016-2-1

©2016 by De Gruyter

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https://doi.org/10.1515/ijcre-2014-0106
Schlagwörter für diesen Artikel
gas–solid fluidized bed reactor; interparticle forces; reactor simulation; two-phase flow model

Artikel in diesem Heft

  1. Frontmatter
  2. Review
  3. Novel Membrane Reactor Concepts for Hydrogen Production from Hydrocarbons: A Review
  4. Research Articles
  5. Modeling and Simulation Study of an Industrial Radial Moving Bed Reactor for Propane Dehydrogenation Process
  6. Oxidative Degradation of Methylene Blue in Aqueous Medium Catalyzed by Lab Prepared Nickel Hydroxide
  7. CFD Modelling of a Hollow Fibre Membrane for CO2 Removal by Aqueous Amine Solutions of MEA, DEA and MDEA
  8. Performance Study of a Thermally Double Coupled Multi-Tubular Reactor by Considering the Effect of Flow Type Patterns
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  10. Three-Phase Model of a Fluidized-Bed Catalytic Reactor for Polyethylene Synthesis
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  12. DM Water Plant Sedimentation as a Cheap and Waste Source of Catalyst for Biodiesel Production
  13. Recovery of Biogas from Meat Industry Wastewater Using Continuously Stirred Tank Reactor (CSTR): Modeling and Optimization
  14. Comparison of CFD Simulation and Simplified Modeling of a Fluidized Bed CO2 Capture Reactor
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  16. Hydroisomerization of Biomass Derived n-Hexadecane Towards Diesel Pool: Effect of Selective Removal External Surface Sites from Pt/ZSM-22
  17. Heat Flux and Variable Thermal Conductivity Effects on Casson Flow and Heat Transfer due to an Exponentially Stretching Sheet with Viscous Dissipation and Heat Generation
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  47. Effect of Biomass Compositions on Combustion Kinetic Parameters using Response Surface Methodology
  48. Short Communications
  49. Discussions on Particle Flux Measurement in Gas-Solids Risers
  50. Use of New Regeneration Processes for Thermolabile Amines
  51. Oxidative-Extractive Desulfurization of Liquid Fuel by Dimethyl Sulfoxide and ZnCl2 Based Ionic Liquid
  52. Corrigendum
  53. Corrigendum to: Performance Analysis of Immobilized Enzyme Semifluidised Bed Bioreactors
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Heruntergeladen am 22.9.2025 von https://www.degruyterbrill.com/document/doi/10.1515/ijcre-2014-0106/html
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