Fluid-dynamic experimental study in a bubble column with internals

Colmenares, A.; Sevilla, M. Franco; Goncalves, J.J.; González-Mendizabal, Dosinda

doi:10.1016/s0735-1933(01)00244-5

Cited by 7 publications

(3 citation statements)

References 17 publications

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“…The effect of solid particles, including magnesium hydroxide [21], calcium hydroxide [21], iron oxide [22], calcium carbonate [23], and carbon particles [24] at various concentrations in slurry reactors was reported to increase the gas holdup and gas-liquid interfacial area at low concentrations (<5 vol.%). The increase of solid particle size, on the other hand, was found to decrease the gas holdup [25,26]. Furthermore, the effect of solid particles on the gas holdup should account not only for the solid concentration, but also for particle nature, size and density, which might significantly affect the gas holdup and subsequently the gas-liquid interfacial area [17,27].…”

Section: Physical Propertiesmentioning

confidence: 98%

Novel correlations for gas holdup in large-scale slurry bubble column reactors operating under elevated pressures and temperatures

Behkish

Lemoine

Oukaci³

et al. 2006

Chemical Engineering Journal

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Section: Physical Propertiesmentioning

confidence: 98%

Novel correlations for gas holdup in large-scale slurry bubble column reactors operating under elevated pressures and temperatures

Behkish

Lemoine

Oukaci³

et al. 2006

Chemical Engineering Journal

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“…Increasing the solid particles density was reported to decrease the gas holdup [137][138][139][140][141][142][143][144][145]. The effect of solid particles size on the gas holdup was dependent on the wettability of the particles [105,120,134].…”

Section: Gas Holdupmentioning

confidence: 99%

“…The effect of solid particles size on the gas holdup was dependent on the wettability of the particles [105,120,134]. For non-wetting particles, the gas holdup was found to increase with the particle size, whereas the opposite was observed for wetting particles [105,134,[137][138][139][140][141][142][143][144][145]. The effect of solid particles wettability on the gas holdup, however, was not clear as the values were reported to increase and also decrease [105,134].…”

Section: Gas Holdupmentioning

confidence: 99%

Fischer–Tropsch Synthesis in Slurry Bubble Column Reactors: Experimental Investigations and Modeling – A Review

Basha

Sehabiague

Abdel‐Wahab

et al. 2015

International Journal of Chemical Reactor Engineering

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This paper presents an extensive review of the kinetics, hydrodynamics, mass transfer, heat transfer and mathematical as well as computational fluid dynamics (CFD) modeling of Low-Temperature Tropsch Synthesis (LTFT) synthesis in Slurry Bubble Column Reactors (SBCRs), with the aim of identifying potential research and development areas in this particular field. The kinetic expressions developed for F-T synthesis over iron and cobalt catalysts along with the water gas shift (WGS) reactions are summarized and compared. The experimental data and empirical correlations to predict the hydrodynamics (gas holdup, Sauter mean bubble diameter, and bubble rise velocity), mass transfer coefficients and heat transfer coefficients are presented. The effects of various operating variables, including pressure, temperature, gas velocity, catalyst concentration, reactor geometry, and reactor internals on the hydrodynamic and transport parameters as well as the performance of SBCRs are discussed. Additionally, modeling efforts of SBCRs, using axial dispersion models (ADM), multiple cell recirculation models (MCCM) and computational fluid dynamics (CFD), are addressed. This review revealed the following:(1) Numerous F-T and WGS kinetic rate expressions are available for cobalt and iron catalysts and one must be careful in selecting the appropriate expressions for LTFT. Iron catalyst suffers from severe attrition and subsequent deactivation in SBCRs and accordingly building a costly catalyst manufacturing facility onsite is required to maintain a steady operation of the F-T reactor;(2) Experimental data on the hydrodynamic and transport parameters at high pressures and temperatures, typical to those of actual F-T synthesis, remain scanty when compared with the plethora of studies conducted using air-water systems in small reactors at ambient conditions; (3) Several empirical correlations for predicting the hydrodynamic and mass as well heat transfer parameters are available and one should select those which consider the reactor diameter, gas mixtures and the potential foamability of the F-T liquids; (4) The effect of cooling internals configuration and sparger design on the hydrodynamic and transport parameters, local turbulence, mixing and catalyst attrition are yet to be seriously addressed; (5) The impact of operating variables on the hydrodynamic and transport parameters as well as the overall performance of the SBCRs should be investigated using actual F-T fluid-solid systems under typical pressures and temperatures using a large-scale reactor ( > 0.15 m ID) in the presence of gas spargers and cooling internals; (6) Significant efforts are still required in order to advance CFD modeling of SBCRs, particularly those pertaining to the relevant closure models, such as drag, lift and turbulence. Also, cooling internals configuration and the design as well as orientation of gas spargers should be accounted for in the CFD modeling; and (7) Proper validations of the CFD formulations using actual systems for F-T SBCR are needed.

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Advances in design of internals: Applications in conventional and process intensification units

Chen,

Verding,

Lang

et al. 2024

Chemical Engineering and Processing - Process Intensification

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Fluid-dynamic experimental study in a bubble column with internals

Cited by 7 publications

References 17 publications

Novel correlations for gas holdup in large-scale slurry bubble column reactors operating under elevated pressures and temperatures

Novel correlations for gas holdup in large-scale slurry bubble column reactors operating under elevated pressures and temperatures

Fischer–Tropsch Synthesis in Slurry Bubble Column Reactors: Experimental Investigations and Modeling – A Review

Advances in design of internals: Applications in conventional and process intensification units

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