Improvement of the simulation of fuel particles motion in a fluidized bed by considering wall friction

García-Gutiérrez, L.M.; Hernández-Jiménez, F.; Cano-Pleite, Eduardo

doi:10.1016/j.cej.2017.03.109

Cited by 11 publications

(5 citation statements)

References 33 publications

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“…However, these buoyancy effects can be avoided by increasing the gas velocity to impose a more vigorous fluidization of the bed, improving the fuel mixing (Soria-Verdugo et al, 2011b;Köhler et al, 2017). This improvement of fuel axial mixing for increasing gas velocities was confirmed by simulations run by Garcia-Gutierrez et al (2017) using a fully couple hybrid-model. Regarding fuel lateral mixing, mixing cells, defined as regions of the fluidized bed containing a bubble preferential path at the center (Pallarès and Jhonsson, 2006), affect the dispersion of solid fuel particles inside the bed (Sette et al, 2014), while their motion in the freeboard can be modeled as a ballistic trajectory (García-Gutiérrez et al, 2014).…”

Section: Introductionmentioning

confidence: 83%

Pollutant emissions released during sewage sludge combustion in a bubbling fluidized bed reactor

et al. 2020

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Section: Introductionmentioning

confidence: 83%

Pollutant emissions released during sewage sludge combustion in a bubbling fluidized bed reactor

et al. 2020

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“…Numerical simulations of fluidized bed systems constitute a complementary tool to experiments, either to analyse variables difficult to measure in experimental units or to test extreme experimental conditions. The most common numerical techniques to simulate fluidized beds are Eulerian−Eulerian Two−Fluid Models (TFM) [51,52,53], Eulerian−Lagrangian approaches such as Discrete Element Models (DEM) [54,55], or a combination of both strategies (coupled TFM−DEM) [56,57]. The use of these techniques combined with experiments can be very effective to achieve a detailed analysis of the hydrodynamics of complex gas−solids systems [58,59].…”

Section: Aircooledmentioning

confidence: 99%

Exergy recovery from solar heated particles to supercritical CO2

Hernández-Jiménez

Soria-Verdugo

Acosta-Iborra

et al. 2019

Applied Thermal Engineering

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In this work, the technical feasibility of a fluidized and a fixed bed heat exchanger in a concentrating solar power (CSP) tower for heat recovery applications is analysed using Two-Fluid Model simulations. The heat recovery process analysed in this work corresponds to the discharge of sensible heat from solid particles.In the cases studied, the fluidizing agent of the bed is carbon dioxide (CO 2 ) in supercritical conditions and the particles, which constitute the bed material, are sensible heat storage material. CO 2 is gaining attention in its application as a working fluid in thermodynamic cycles for power generation, especially in transcritical and supercritical conditions due to its high density and excellent heat transfer characteristics. Currently, research is focused on exploring the CO 2 capabilities when used in combination with CSP technologies, together with systems that allow the storage and recovery of the solar thermal energy.Fixed or fluidized beds work as a direct contact heat exchanger between the particles and the working fluid that percolates through the bed material. Several bed configurations are presented to derive the optimal configuration of the bed that enhances the efficiency from both the energetic and the exergetic points of view. The results indicate that a fixed bed heat exchanger produces a maximum increase of availability in the CO 2 flow during longer times than a fluidized bed heat exchanger. Therefore, to maximise the exergy recovery from solar heated particles to supercritical CO 2 a fixed bed heat exchanger is more suitable than a fluidized bed heat exchanger.

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“…MFiX (which is an acronym for "Multiphase Flow with Interphase eXchanges") is developed by the National Energy Technology Laboratory of the United States. Presently, it is employed by researchers all around the world for various purposes [23][24][25][26][27][28][29][30][31][32]. We chose it because of its unique advantages: it is an open-source program that is entirely transparent to the user and editable, but it is also provided with a user-friendly graphical user interface (GUI).…”

Section: Introductionmentioning

confidence: 99%

A Discrete Element Method Study of Solids Stress in Cylindrical Columns Using MFiX

Marchelli

Felice

2020

Processes

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Friction phenomena play a key role in discrete element method (DEM) modeling. To analyze this aspect, we employed the open-source program MFiX to perform DEM simulations of cylindrical vertical columns filled with solid particles. These are still associated with and described by the pioneering model by the German engineer H.A. Janssen. By adapting the program’s code, we were able to gather numerous insights on the stress distribution within the solids. The column was filled with different amounts of solids and, after the system had stabilized, we assessed the pressure in the vertical and radial directions and the distribution of the friction force for all particles. An analysis of the bottom pressure for varying particle loads allowed us to infer that the program can correctly predict the expected asymptotical behavior. After a detailed assessment of the behavior of a single system, we performed a sensitivity analysis taking into account several of the variables employed in the simulations. The friction coefficient and filling rate seem to affect the final behavior the most. The program appears suitable to describe friction phenomena in such a static system.

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Improvement of the simulation of fuel particles motion in a fluidized bed by considering wall friction

Abstract: A. (2017). Improvement of the simulation of fuel particles motion in a fluidized bed by considering wall friction. Chemical

Cited by 11 publications

References 33 publications

Pollutant emissions released during sewage sludge combustion in a bubbling fluidized bed reactor

Pollutant emissions released during sewage sludge combustion in a bubbling fluidized bed reactor

Exergy recovery from solar heated particles to supercritical CO2

A Discrete Element Method Study of Solids Stress in Cylindrical Columns Using MFiX

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