Bubbling Bed Model for Kinetic Processes in Fluidized Beds. Gas-Solid Mass and Heat Transfer and Catalytic Reactions

Kunii, Daizō; Levenspiel, Octave

doi:10.1021/i260028a001

Cited by 117 publications

(44 citation statements)

References 11 publications

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“…This requires the flow of gas through the bubbles to be much greater than that through the particulate phase, i.e. U/U mf > 3 [41]. Here U/U mf was equal to 5.0, so this latter condition is satisfied.…”

Section: Reactions Of Nitric Oxide With Calcium Oxide and Carbon Monomentioning

confidence: 99%

The effect of CaO on emissions of nitric oxide from a fluidised bed combustor

Allen

Hayhurst

2015

Fuel

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Section: Reactions Of Nitric Oxide With Calcium Oxide and Carbon Monomentioning

confidence: 99%

The effect of CaO on emissions of nitric oxide from a fluidised bed combustor

Allen

Hayhurst

2015

Fuel

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“…S.1 of the Supporting information. In bubbling fluidized bed reactors, a distinct upper surface of the dense phase has been experimentally observed and simulated (Kunii and Levenspiel, 1997, 1990, 1968a, 1968bMahalatkar et al, 2011;Shuai et al, 2011), which is not the case for dense circulating fluidized beds. Thus, a preliminary screening of the available experimental data was performed, with the objective to identify reactor configurations that operate within the bubbling bed fluidization regime.…”

Section: Literature Survey Of Bubbling Bed Experimental Data and Corrmentioning

confidence: 99%

Model-assisted analysis of fluidized bed chemical-looping reactors

Zhou

Han

Bollas

2015

Chemical Engineering Science

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Model is predictive of the exit gas composition of the literature data. Analysis of the sensitivity of model predictions to hydrodynamic parameters. The effect of reactor hydrodynamics on CLC performance is explored. a b s t r a c t A three-phase hydrodynamic model is employed for the analysis of experimental data of chemicallooping reduction with nickel-based oxygen carriers and methane as the fuel. The model rigorously accounts for the mass, energy, and pressure balances, and the effect of oxygen carrier entrainment in the freeboard region. Model predictions are in good agreement with the relevant experimental data. The capability of the model to be used in the scale-up of fixed-bed kinetic studies of oxygen carriers to fluidized bed pilot-scale reactors is illustrated. The generality and validity of the model are analyzed, so that it can be used for further reactor design studies. In particular, sensitivity analyses, in terms of the crucial hydrodynamic parameters and correlations are carried out and the effects of important parameters, such as bubble size, mass transfer, oxygen carrier entrainment and reactions in the freeboard, on the performance of the chemical-looping reducer are investigated.

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“…The study of gasification of materials using fluidized bed [1] gasifier has been a subject of interest among many researchers and scientists. This problem is very much important in replacing fossil fuels, particularly the fuels used in automobiles.…”

Section: Introductionmentioning

confidence: 99%

CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw

Singh¹,

Srivastava²

2017

OALib

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In the work being presented, computational fluid dynamics (CFD) analysis on fluidized bed gasification of rice husk has been carried out. The multiphase Eulerian model was undertaken in the analysis. Due to the lack of computational space, two dimensional models of fluidized bed were created. The objective of the investigation was to study the effect of variation on velocity with varying particle sizes. The quality of synthesis gas was also taken into account. The inlet's superficial velocity was varied from 0.2 m/s to 1.2 m/s and diameter of rice husk varied from 0.0438 mm to 4.38 mm. Based on obtained results, this may be concluded that minimum fluidization velocity decreases with increase in diameter of rice husk. The carbon conversion was found to be maximum for 0.7 m/s velocity and carbon conversion increased for other velocities up to 96.9%. The analysis was carried out using ANSYS FLUENT 14.0 non-commercial code. Subject AreasMechanical Engineering

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Bubbling Bed Model for Kinetic Processes in Fluidized Beds. Gas-Solid Mass and Heat Transfer and Catalytic Reactions

Cited by 117 publications

References 11 publications

The effect of CaO on emissions of nitric oxide from a fluidised bed combustor

The effect of CaO on emissions of nitric oxide from a fluidised bed combustor

Model-assisted analysis of fluidized bed chemical-looping reactors

CFD Analysis on Fluidized Bed Gasification of Rice Husk and Rice Straw

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