Measurements of Dispersion Coefficients for FCC Particles in a Free Board

Kashyap, Mayank; Gidaspow, Dimitri

doi:10.1021/ie1012079

“…Lateral dispersion in bubbling beds has been widely studied both experimentally [17][18][19][20][21] and numerically [16,[22][23][24]. As a benchmark for the verification of the model and comparison with the oscillating beds, a bubbling bed at constant gas flow is simulated.…”

Section: Constant Gas Flowmentioning

confidence: 99%

“…Therefore, recent work has dealt with deriving lateral dispersion coefficients [16] in order to provide engineering reactor models of gas-solid fluidized beds with a quantification of the lateral solids mixing, and, by extension, also lateral heat and mass transfer. Available literature focuses primarily on the experimental methods for estimating lateral dispersion coefficients [17][18][19][20][21] based on tracer methods, generally classified as saline, ferromagnetic, thermal, radioactive, carbon or phosphorescent. All these methods have limitations to their accuracy and resolution [22].…”

Section: Introductionmentioning

confidence: 99%

Solids lateral mixing and compartmentalization in dynamically structured gas–solid fluidized beds

Vandewalle

¹

,

Francia

²

,

Marin

³

et al. 2022

Chemical Engineering Journal

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“…The solids slugging structure can be measured with the technology of gamma ray densitometry [30,31]. Other techniques such as particle image velocimetry (PIV), laser doppler anemometry (LDA), and fiber optic probe can also be used for the measurement of solids structure in fluidized-bed reactors [31][32][33][34]. In this work the measurement of solids concentration was not done due to lack of these advanced measuring instruments; however, the measurement of solids concentration will be included in our future studies to improve the quality of our research.…”

Section: Cfd Simulation Resultsmentioning

confidence: 99%

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

Biglari,

Liu,

Elkamel

et al. 2023

Preprint

0

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Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were carried out to evaluate the hydrodynamic characteristics of a pilot fluidized-bed biomass gasifier. In the small scale column solids were fluidized. The pressure and other hydrodynamic properties were monitored for the validation of the scaling-law application. In addition to the scaling-law modeling method, the CFD approach was presented to simulate the gas-particle system in the small column. 2D CFD models were developed to simulate the hydrodynamic regime. The simulation results were validated with the experimental data from the small column. It was proved that the CFD model was able to accurately predict the hydrodynamics of the small column. The outcomes of this research present both the scaling law with the lower computational cost and the CFD modeling as a more robust method to suit various needs for the design of fluidized-bed gasifiers.

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“…The solids slugging structure can be measured with the technology of gamma ray densitometry [30,31]. Other techniques such as particle image velocimetry (PIV), laser doppler anemometry (LDA), and fiber optic probe can also be used for the measurement of solids structure in fluidized-bed reactors [31][32][33][34]. In this work the measurement of solids concentration was not done due to lack of these advanced measuring instruments; however, the measurement of solids concentration will be included in our future studies to improve the quality of our research.…”

Section: Cfd Simulation Resultsmentioning

confidence: 99%

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

Biglari

¹

,

Liu

²

,

Elkamel

³

et al. 2016

View full text Add to dashboard Cite

Two modeling approaches, the scaling-law and CFD (Computational Fluid Dynamics) approaches, are presented in this paper. To save on experimental cost of the pilot plant, the scaling-law approach as a low-computational-cost method was adopted and a small scale column operating under ambient temperature and pressure was built. A series of laboratory tests and computer simulations were carried out to evaluate the hydrodynamic characteristics of a pilot fluidized-bed biomass gasifier. In the small scale column solids were fluidized. The pressure and other hydrodynamic properties were monitored for the validation of the scaling-law application. In addition to the scaling-law modeling method, the CFD approach was presented to simulate the gas-particle system in the small column. 2D CFD models were developed to simulate the hydrodynamic regime. The simulation results were validated with the experimental data from the small column. It was proved that the CFD model was able to accurately predict the hydrodynamics of the small column. The outcomes of this research present both the scaling law with the lower computational cost and the CFD modeling as a more robust method to suit various needs for the design of fluidized-bed gasifiers.

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Measurements of Dispersion Coefficients for FCC Particles in a Free Board

Cited by 15 publications

References 82 publications

Solids lateral mixing and compartmentalization in dynamically structured gas–solid fluidized beds

Solids lateral mixing and compartmentalization in dynamically structured gas–solid fluidized beds

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

Application of Scaling-Law and CFD Modeling to Hydrodynamics of Circulating Biomass Fluidized Bed Gasifier

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