Coarse-grained CFD-DEM simulation of biomass gasification in a fluidized bed reactor

Ostermeier, Peter; Fischer, Felix; Fendt, S.; DeYoung, Stefan; Spliethoff, Hartmut

doi:10.1016/j.fuel.2019.115790

Cited by 71 publications

(39 citation statements)

References 57 publications

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“…Coal gasification was studied in a bubbling fluidized bed including heat transfer and heterogeneous chemical reactions, which allowed the influence of the operating parameters to be effectively characterized [89]. Using a commercial software, the steam gasification of biomass was studied in a bubbling bed including heat transfer, chemical reaction and particle shrinkage [34,90]. The fast pyrolysis of biomass was investigated using a multiscale approach, combining coarse-grain particle scale simulations with reactor scale modelling [91,92]; similarly, coarse grain DEM-CFD combined with reduced-order modelling was used to simulate a pilot-scale updraft coal gasification reactor [93].…”

Section: Bubbling/spouted/liquid Fluidized Bedsmentioning

confidence: 99%

“…Overall, application of the coarse graining method to DEM simulations is attracting a quickly growing attention in recent times, as shown by the yearly number of papers on the subject (see Figure 1). Early applications have been reported in commercial software packages [32] and are available in recent versions, see e.g., [33][34][35]. The feature is available also in the last version (20.4) of the open-source software MFiX-DEM [36].…”

Section: Introductionmentioning

confidence: 99%

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Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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In the last decade, a few of the early attempts to bring CFD-DEM of fluidized beds beyond the limits of small, lab-scale units to larger scale systems have become popular. The simulation capabilities of the Discrete Element Method in multiphase flow and fluidized beds have largely benefitted by the improvements offered by coarse graining approaches. In fact, the number of real particles that can be simulated increases to the point that pilot-scale and some industrially relevant systems become approachable. Methodologically, coarse graining procedures have been introduced by various groups, resting on different physical backgrounds. The present review collects the most relevant contributions, critically proposing them within a unique, consistent framework for the derivations and nomenclature. Scaling for the contact forces, with the linear and Hertz-based approaches, for the hydrodynamic and cohesive forces is illustrated and discussed. The orders of magnitude computational savings are quantified as a function of the coarse graining degree. An overview of the recent applications in bubbling, spouted beds and circulating fluidized bed reactors is presented. Finally, new scaling, recent extensions and promising future directions are discussed in perspective. In addition to providing a compact compendium of the essential aspects, the review aims at stimulating further efforts in this promising field.

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Section: Bubbling/spouted/liquid Fluidized Bedsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

2021

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“…The drag coefficient β is calculated using the diameter of the real physical particles. The derivations and validations of this CG approach are available in literature …”

Section: Numerical Models and Simulation Parametersmentioning

confidence: 99%

“…Computational fluid dynamics (CFD) is another powerful tool to investigate sands–biomass fluidization since the positions and velocities of the sand and biomass particles are tracked throughout the flow. Xiong et al reviewed the widely used CFD models such as multifluid modeling, in which gas–sands–biomass are all treated as continuum phases; Euler–Lagrange–Lagrange modeling, in which gas phase is treated as continuum phase while sands and biomass are treated as discrete phase; Euler–Euler–Lagrange modeling, in which the gas phase and sands are treated as continuum phase while biomass is treated as discrete phase. The Lagrange‐based methods directly tracked the positions of particles and is convenient for the analysis of mixing .…”

Section: Introductionmentioning

confidence: 99%

Experimental and numerical investigation of sands and Geldart A biomass co‐fluidization

Gao

et al. 2020

AIChE Journal

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This article investigated the fluidization of sands and small Geldart A biomass mixtures. The mixture fluidized like Geldart A type particles with a uniform bed expansion regime before bubbling. The video recorded color distance between pure sands and sands-biomass mixtures was used to estimate the sands-biomass mixing. The coarse-grained computational fluid dynamics-discrete element method with a hybrid drag model which couples the Syamlal-O'Brien drag and a filtered drag can capture the mixing while the simulation with Gidaspow drag predicted a segregated bed. The simulations were further validated with experimental measured pressure drops. The time averaged pressure drop equals the weight of the bed material, however, its fluctuation is about three times of the bed material fluctuation. K E Y W O R D S biomass, coarse-grained CFD-DEM, drag model, filtered model, fluidized bed

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“…Emulsion and bubble phases have written the conservative equation of the mass of the gas species. The controlled entry and exit rates of mass conservation and inconsistent diffusion effects for gas species at each phase need to be considered [41,42]. The assumption of this model is for the empty bubble phase of solid particles distributed to uniform species.…”

Section: Introductionmentioning

confidence: 99%

Investigation of Biomass Combustion and Conceptual Design of The Fluidized-Bed

Muhtadin¹,

Erdiwansyah²,

Mahidin³

et al. 2020

ARFMTS

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This study investigates the combustion process of empty fruit bunches (EFB) and palm kernel shells (PKS) in a bubbly fluidized-bed combustion chamber. The biomass combustion simulation process uses a kinetic model consisting of chemical kinetic and hydrodynamic flow. This modelling is based on the two-phase theory in the fluidized bed. Where both phases in the bed are assumed that there are a mass and energy transfer between them. These phases include the emulsion phase and the bubble phase which contains solid particles. The constant temperatures throughout the reactor are assumed in this modelling. This study also investigates the parametric and effects of various parameters carried out. The experimental research shows that there is a change in bed diameter and has a negligible effect on combustion performance. The results of biomass combustion experiments with a fluidized-bed design have promising and satisfying results compared to several experimental studies in the literature. In addition, the increase in reactor temperature and a bed height of combustion efficiency also increased. However, the moisture of the biomass and the speed of the fuel entering can affect various for combustion efficiencies. Suitable operating conditions can produce maximum overall efficiency.

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Coarse-grained CFD-DEM simulation of biomass gasification in a fluidized bed reactor

Cited by 71 publications

References 57 publications

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Coarse-Grain DEM Modelling in Fluidized Bed Simulation: A Review

Experimental and numerical investigation of sands and Geldart A biomass co‐fluidization

Investigation of Biomass Combustion and Conceptual Design of The Fluidized-Bed

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