Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Hamidouche, Ziad; Masi, Enrica; Fede, Pascal; Simonin, Olivier; Mayer, Karl; Penthor, Stefan

doi:10.1016/j.ces.2018.08.032

Cited by 32 publications

(14 citation statements)

References 59 publications

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“…Nevertheless, the contribution from the frictional contacts S fr ik becomes significant close to the maximum packing and is, therefore, retained in Eq. (10).…”

Section: Filtered Two-fluid Modelsmentioning

confidence: 99%

“…Particularly, the OpenFOAM solver twoPhaseEulerFoam was modified to account for Eqs. (7)- (10). Time advancement is achieved by a variable time-step procedure, where the time step is limited by a maximum Courant number of 0.25.…”

Section: Numerical Simulationsmentioning

confidence: 99%

“…Fluidized beds are widely used in a variety of industrially important processes. During the last decades, the analysis of the hydrodynamics or the efficiency of fluidized beds through numerical simulations has become increasingly common [1][2][3][4][5][6][7][8][9][10], where the two-fluid model (TFM) approach has proven to provide fairly good predictions of the hydrodynamics of gassolid flows [1].…”

Section: Introductionmentioning

confidence: 99%

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Verification and Validation of Spatially Averaged Models for Fluidized Gas‐Particle Suspensions

Schneiderbauer

2020

Chem Eng & Technol

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Two different methods for closure modeling of the unresolved terms appearing in the filtered two-fluid model are discussed and compared. The spatially averaged two-fluid model is based on generalizing the concepts of large eddy simulation to gas-particle flows. In the approximate deconvolution method-two-fluid model approach, the unresolved terms are modeled by an approximate deconvolution method, where an approximation of the unfiltered solution is obtained by repeated filtering. Finally, these models are applied to a lab-scale and a pilot-scale fluidized bed. Both approaches yield fairly good agreement with a highly resolved reference simulation as well as with experimental data. Additionally, both methods deliver reasonable grid-independent solutions up to a grid resolution of 2 cm in the case of Geldart type A particles.

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“…Nevertheless, the contribution from the frictional contacts S fr ik becomes significant close to the maximum packing and is, therefore, retained in Eq. (10).…”

Section: Filtered Two-fluid Modelsmentioning

confidence: 99%

Section: Numerical Simulationsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Verification and Validation of Spatially Averaged Models for Fluidized Gas‐Particle Suspensions

Schneiderbauer

2020

Chem Eng & Technol

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“…Regarding this issue, the solid combustion in CLC was simulated as a result of developing the mathematical modeling. Also the modelling were performed on the fuel reactor for different gases with different oxygen carriers such as Parker (2014), Han and Bollas (2016), Porrazzo et al (2016), Menon and Patnaikuni (2017), Zhang et al (2017), Haus et al (2018) and Hamidouche et al (2019).…”

Section: Introductionmentioning

confidence: 99%

Numerical and experimental analysis for simulating fuel reactor in chemical looping combustor system

Ismail

Ding

Ramzy

et al. 2020

Int J Coal Sci Technol

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The greenhouse problem has a significant effect on our communities such as, health and climate. Carbon dioxide is one of the main gases that cause global warming. Therefore, CO2 capture techniques have been the focus of attention these days. The chemical looping combustion technique adopted the air reactor and fuel reactor to recycle heat energy. This study presents a numerical and experimental investigation on a fuel reactor in chemical looping combustor (CLC) system. The present numerical model is introduced by the kinetic theory of granular flow and coupled with gas–solid flow with chemical reactions to simulate the combustion of solids in the CLC. The k–ε turbulent model was used to model the gas phase and the particle phase. The developed model simplify the prediction of flow patterns, particle velocities, gas velocities, and composition profiles of gas products and the distribution of heterogeneous reaction rates under the same operating conditions. The predicted and experimental results were compared according to the basis of determination coefficient (R2). In addition the results showed that there is a good agreement between the predicted and experimental data. The value of (R2) for CO, CO2 and CH4 was 0.959, 0.925 and 0.969 respectively. This shows that the present model is a promising simulation for solid particle combustion and gives the power direction for the design and optimization of the CLC systems.

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“…9.7.4 Other Flows and Particle Flow/Density Ratios. Reference is made here to the considerable body of work of Simonin, Fede and Masi and their coworkers in extending the GLM approach to model dense reactive flows, common to many industrial flows [152] involving fluidized beds [153][154][155] and chemical combustion plants [156] where two-way coupling between parti-3764 cle and carrier flow is dominant and interparticle collisions are 3765 crucial features [155]. The work of Swailes et al [17] has already 3766 been mentioned on the added mass effect in flows concerned with 3767 the transport of droplets in liquids pipelines in the petroleum 3768 industry.…”

mentioning

confidence: 99%

The Development and Application of a Kinetic Theory for Modeling Dispersed Particle Flows

Reeks

2021

Journal of Fluids Engineering

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This Freeman Scholar article reviews the formulation and application of a kinetic theory for modeling the transport and dispersion of small particles in turbulent gas-flows, highlighting the insights and understanding it has provided and some of the long standing problems in the modeling of dispersed flows it has resolved. The theory has been developed and refined by numerous authors and now forms a rational basis for modeling complex particle laden flows. The formalism and methodology of this approach are discussed and the choice of closure of the kinetic equations involved which ensures realizability and well posedness with exact closure for Gaussian carrier flow fields. The historical development is presented and how single particle kinetic equations resolve the problem of closure of the transport equations for particle mass, momentum and kinetic energy /stress (the so called continuum equations) and the treatment of the dispersed phase as a fluid. The mass fluxes associated with the turbulent aerodynamic driving forces and interfacial stresses are shown to be both dispersive and convective in inhomogeneous turbulence with implications for the build up of particles concentration in near wall turbulent boundary layers and particle pair concentration at small separation. It is shown how this approach deals with the natural wall boundary conditions for a flowing particle suspension and examples are given of partially absorbing surfaces with particle scattering, and gravitational settling; how this approach has revealed the existence of contra gradient diffusion in a developing shear flow and the influence of the turbulence on gravitational settling (the Maxey effect). Particular consideration is given to the general problem of particle transport and deposition in turbulent boundary layers and near wall behavior including particle resuspension. Finally the application of a particle pair formulation for both monodisperse and bidisperse particle flows is reviewed where the differences between the two are compared through the influence of collisions on the particle continuum equations and on the particle collision kernel for the clustering of particles and the degree of random uncorrelated motion (RUM) at the small scales of the turbulence. The inclusion of bidisperse particle suspensions implies the application to polydisperse flows and the evolution of particle size distribution.

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Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant

Abstract: Unsteady three-dimensional theoretical model and numerical simulation of a 120-kW chemical looping combustion pilot plant. (2019) Chemical Engineering Science, 193. 102-119.

Cited by 32 publications

References 59 publications

Verification and Validation of Spatially Averaged Models for Fluidized Gas‐Particle Suspensions

Verification and Validation of Spatially Averaged Models for Fluidized Gas‐Particle Suspensions

Numerical and experimental analysis for simulating fuel reactor in chemical looping combustor system

The Development and Application of a Kinetic Theory for Modeling Dispersed Particle Flows

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