CFD simulation of a chemical-looping fuel reactor utilizing solid fuel

Mahalatkar, Kartikeya; Kuhlman, John M.; Huckaby, E. David; O’Brien, Thomas J.

doi:10.1016/j.ces.2011.04.025

Cited by 82 publications

(38 citation statements)

References 40 publications

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“…The Gibbs energy minimization method is used in this study to analyze the reactivity and capacity of the oxygen carriers Fe 2 O 3 , CuO, and combination of Fe 2 O 3 and CuO, and to compare their performance. Following are the main reactions supposed to be occurring in the CLC process (Mahalatkar et al 2011 andAbad et al 2007): …”

Section: Methodsmentioning

confidence: 99%

Thermodynamic analysis of in situ gasification-chemical looping combustion (iG-CLC) of Indian coal

Suresh

Menon

Kodali

et al. 2015

Environ Sci Pollut Res

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Chemical looping combustion (CLC) is an inherent CO capture technology. It is gaining much interest in recent years mainly because of its potential in addressing climate change problems associated with CO emissions from power plants. A typical chemical looping combustion unit consists of two reactors-fuel reactor, where oxidation of fuel occurs with the help of oxygen available in the form of metal oxides and, air reactor, where the reduced metal oxides are regenerated by the inflow of air. These oxides are then sent back to the fuel reactor and the cycle continues. The product gas from the fuel reactor contains a concentrated stream of CO which can be readily stored in various forms or used for any other applications. This unique feature of inherent CO capture makes the technology more promising to combat the global climate changes. Various types of CLC units have been discussed in literature depending on the type of fuel burnt. For solid fuel combustion three main varieties of CLC units exist namely: syngas CLC, in situ gasification-CLC (iG-CLC) and chemical looping with oxygen uncoupling (CLOU). In this paper, theoretical studies on the iG-CLC unit burning Indian coal are presented. Gibbs free energy minimization technique is employed to determine the composition of flue gas and oxygen carrier of an iG-CLC unit using FeO, CuO, and mixed carrier-FeO and CuO as oxygen carriers. The effect of temperature, suitability of oxygen carriers, and oxygen carrier circulation rate on the performance of a CLC unit for Indian coal are studied and presented. These results are analyzed in order to foresee the operating conditions at which economic and smooth operation of the unit is expected.

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Section: Methodsmentioning

confidence: 99%

Thermodynamic analysis of in situ gasification-chemical looping combustion (iG-CLC) of Indian coal

Suresh

Menon

Kodali

et al. 2015

Environ Sci Pollut Res

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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: 97%

“…CFD is capable of representing the detailed hydrodynamic characteristics of the reactor, but it is computationally intensive and has limited applications to process design and sensitivity analysis. Mahalatkar et al (2011Mahalatkar et al ( , 2010, Jung and Gamwo (2008), Deng et al (2009) and Wang et al ( 2012Wang et al ( , 2013 developed CFD models to simulate the performance of CLC Reducers in bubbling or circulating fluidized beds. Summarizing their results and conclusions, it was observed that fuel conversion can be hindered by large and fast bubbles passing through the reactor and agreement with experimental data depends on the accuracy of the bubble phase modeling.…”

Section: Introductionmentioning

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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“…Chemical reactions are included and heat transfer is fully accounted for. The detailed equations are described in Mahalatkar et al (2010) and in Ansys-Fluent (2006).…”

Section: The Cfd Modelmentioning

confidence: 99%

“…This assumption appears reasonable so long as the quantitative effects of the kinetic regime tend to zero in the frictional regime and vice versa. The detailed equations for the rheological model in the kinetic regime that was used in the present study have been described in Mahalatkar et al (2010) and Ansys-Fluent (2006). When the solids fraction is close to the dense packing limit, enduring frictional interactions between particles becomes important.…”

Section: The Cfd Modelmentioning

confidence: 99%

Simulations of a Circulating Fluidized Bed Chemical Looping Combustion System Utilizing Gaseous Fuel

Mahalatkar

Kuhlman

Huckaby

et al. 2011

Oil Gas Sci. Technol. – Rev. IFP Energies nouvelles

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Résumé -Simulation de la combustion en boucle chimique d'une charge gazeuse dans un lit fluidisé circulant -Des études numériques de simulation des écoulements (CFD) ont été réalisées sur un lit fluidisé circulant opérant en combustion par boucle chimique (CLC) décrit dans la littérature (Abad et al., 2006 Fuel 85, 1174-1185. Si de nombreuses études expérimentales ont été conduites pour étudier le procédé CLC, les études concernant la simulation des écoulements par CFD de ce concept sont très limitées. Le système de combustion en boucle chimique simulé dans cette étude concerne la combustion d'une charge gazeuse (méthane). Un modèle 2-D à deux phases continues a été utilisé pour décrire les phases gaz et solide avec des sous-modèles détaillés pour décrire les forces d'interactions entre fluideparticule et particule-particule. Des modèles cinétiques globaux ont été intégrés pour décrire les réactions de combustion et de transformation du matériau transporteur d'oxygène. Les résultats obtenus par CFD ont été comparés aux concentrations expérimentales mesurées des différentes espèces chimiques à la sortie du réacteur, aux débits de circulation, à la distribution massique des solides dans les réacteurs, aux fuites et aux taux de dilution. Les simulations CFD instationnaires montrent globalement une concordance raisonnable avec les données expérimentales rapportées. (Abad et al., 2006 Fuel 85, 1174-1185 Oil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 66 (2011) Abstract -Simulations of a Circulating Fluidized Bed Chemical Looping Combustion System Utilizing Gaseous Fuel -Numerical studies using Computational Fluid Dynamics (CFD) have been carried out for a complete circulating fluidized bed chemical looping combustor described in the literature IFP Energies nouvelles International Conference Rencontres Scientifiques d'IFP Energies nouvellesOil & Gas Science and Technology -Rev. IFP Energies nouvelles, Vol. 66 (2011)

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CFD simulation of a chemical-looping fuel reactor utilizing solid fuel

Cited by 82 publications

References 40 publications

Thermodynamic analysis of in situ gasification-chemical looping combustion (iG-CLC) of Indian coal

Thermodynamic analysis of in situ gasification-chemical looping combustion (iG-CLC) of Indian coal

Model-assisted analysis of fluidized bed chemical-looping reactors

Simulations of a Circulating Fluidized Bed Chemical Looping Combustion System Utilizing Gaseous Fuel

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