Numerical study of the partial oxidation of a coal particle in steam and dry air atmospheres

Kestel, Matthias; Nikrityuk, Petr A.; Hennig, O.; Hasse, Christian

doi:10.1093/imamat/hxr071

Cited by 34 publications

(19 citation statements)

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“…Good agreement was observed between our simulations and published data. The details are published elsewhere [25] and not repeated here. Finally, it should be noted that in order to resolve the flame sheet and the thermal and chemical species boundary layers properly we had to use grid refinement near the particle surface.…”

Section: Numerics and Validationmentioning

confidence: 99%

“…The validation of the model and software against the analytic two-film model is reported in [25]. Next, we validate the software and the model we use against experiments by Makino et al [1], where a graphite cylinder reacting with hot air was studied under laminar and turbulent flow conditions.…”

Section: Numerics and Validationmentioning

confidence: 99%

“…In particular, with significant progress in computational methods and computational hardware, a rapid increase can be detected in publications devoted to CFD-based numerical simulations a chemically reacting coal particles, e.g. see [22][23][24][25][26]. For instance, Lee et al [26] carried out onedimensional fully transient numerical simulations of the chemically reacting flow field on and around the surface of an isolated carbon particle.…”

Section: Introductionmentioning

confidence: 99%

“…In conclusion, it should be noted that recent publications devoted to the CFD-based modelling of chemically reactive coal char particles moving in a hot oxidizing atmosphere (see the works [24,25,27]), basically describe the influence of input parameters such as the particle velocity, ambient temperature or particle diameter for single cases. However, no efforts have been made to transfer new knowledge gained in these new works to existing or novel surface reaction-based submodels.…”

Section: Introductionmentioning

confidence: 99%

See 3 more Smart Citations

From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD

Schulze

Kestel

Nikrityuk

et al. 2013

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

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. Trois réactions hétérogènes sont utilisées, ainsi que deux réactions semi-globales homogènes, à savoir l'oxydation du monoxyde de carbone et la réaction du gaz à l'eau. Les particularités distinctives du modèle de sous-maille se trouvent dans la prise en compte de l'influence des réactions homogènes sur les caractéristiques intégrales telles que les taux de combustion du carbone et la température de la particule. Le sous-modèle a été validé en comparant ses résultats avec un modèle complet basé sur la CFD résolvant les questions de flux volumique et de couche limite autour de la particule. Dans ce modèle, les équations de Navier-Stokes couplées aux équations de conservation de l'énergie et des espèces ont été utilisées pour résoudre le problème au moyen de l'approche en état pseudo-stationnaire. À la surface de la particule, l'équilibre de la masse, de l'énergie et de la concentration des espèces a été appliqué, y compris l'effet de l'écou-lement de Stefan et l'effet de la perte de chaleur due aux rayonnements à la surface de la particule. Une bonne adéquation a été atteinte entre le sous-modèle et le modèle basé sur la CFD. En outre, le modèle basé sur la CFD a été comparé aux données expérimentales publiées dans la littérature (Makino et al. (2003) Combust. Flame 132, 743-753). Une bonne concordance a été atteinte entre les données prédites numériquement et celles obtenues expérimentalement pour les conditions d'entrée correspondant au régime contrôlé par la cinétique. La divergence maximale (10 %) entre les expériences et les résultats numériques a été observée dans le régime contrôlé par la diffusion. Enfin, nous discutons de l'influence du nombre de Reynolds, de la fraction massique d'O 2 ambiant et de la température ambiante sur le comportement de la particule de charbon. Abstract -From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD -This work is devoted to the development and validation of a sub-model for the partial oxidation of a spherical char particle moving in an air

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Section: Numerics and Validationmentioning

confidence: 99%

Section: Numerics and Validationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

From Detailed Description of Chemical Reacting Carbon Particles to Subgrid Models for CFD

Schulze

Kestel

Nikrityuk

et al. 2013

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

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“…Analytical studies, such as those carried out by Matalon [28] and Makino [27], provide insight towards asymptotic behaviour of char burnout in the frozen limit. On the other hand, axisymmetric [25,26] and two-dimensional [14,16,20] simulations present the dynamics in the intermediate regime, where a flame is present in the gas-phase. The high complexity of the pulverised and fluidised bed coal combustion, however, has motivated the analysis of unsteady combustion of single coal particles.…”

Section: Introductionmentioning

confidence: 99%

Sensitivity analysis of an unsteady char particle combustion

Hassan

Sayadi

Chenadec

et al. 2021

Fuel

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Simulations of unsteady char particle combustion rely on various models that are necessary in order to correctly predict the governing flow and combustion processes. These models, in turn, rely on model parameters, which are determined by experiments or small scale simulations and contain a certain level of uncertainty. It is therefore, essential to correctly determine the sensitivities of quantities of interest measured using such simulations, with respect to the existing parameters. In this study, a discrete adjoint algorithm is employed to extract sensitivities of various quantities of interest with respect to physical and model parameters. This adjoint framework bears a great advantage in cases where a large input space is analyzed, since a single forward and backward sweep provides sensitivity information with respect to all parameters of interest. Sensitivities are extracted for relevant quantities of interest, such as burning rate and particle temperature, and are then compared as free stream composition changes from air to oxy atmosphere. The evolution of sensitivities in time is shown to be dependent on the selected quantity of interest. Model sensitivities with respect to heterogeneous reaction parameters (oxidation of carbon, in particular) are shown to be the highest, whereas the sensitivities with respect to free stream composition are shown to be significantly lower.

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