Multiphysics Simulations of Entrained Flow Gasification. Part II: Constructing and Validating the Overall Model

Kumar, Mayank; Ghoniem, Ahmed F.

doi:10.1021/ef2008858

Cited by 101 publications

(70 citation statements)

References 34 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…Extensive progress has been made in modeling coal kinetics and in CFD modeling of coal gasification (Abani and Ghoniem, 2013;Kumar and Ghoniem, 2012). Nevertheless, the reactor design and operation have long relied on practical experience rather than on theoretical modeling.…”

Section: Using Co 2 As Coal Carrier: Gasifier Modeling and Feeding Tementioning

confidence: 99%

Techno-economic assessment of two novel feeding systems for a dry-feed gasifier in an IGCC plant with Pd-membranes for CO2 capture

Gazzani¹,

Turi²,

Ghoniem³

et al. 2014

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

This study focuses on the application of Pd-based membranes for CO 2 capture in coal fuelled power plants. In particular, membranes are applied to Integrated Gasification Combined Cycle with two innovative feeding systems. In the first feeding system investigated, CO 2 is used both as fuel carrier and back-flushing gas for the candle filters, while in the second case N 2 is the fuel carrier, and CO 2 the back-flushing gas. The latter is investigated because current dry feed technology vents about half of the fuel carrier, which is detrimental for the CO 2 avoidance in the CO 2 case. The hydrogen separation is performed in membrane modules arranged in series; consistently with the IGCC plant layout, most of the hydrogen is separated at the pressure required to fuel the gas turbine. Furthermore, about 10% of the overall hydrogen permeated is separated at ambient pressure and used to post-fire the heat recovery steam generator. This layout significantly reduces membrane surface area while keeping low efficiency penalties.The resulting net electric efficiency is higher for both feeding systems, about 39%, compared to 36% of the reference Selexol-based capture plant. The CO 2 avoidance depends on the type of feeding system adopted, and its amount of vented gas; it ranges from 60% to 98%. From the economic point of view, membrane costs are significant and shares about 20% of the overall plant cost. This leads in the more optimistic case to a CO 2 avoidance cost of 35 €/t CO2 , which is slightly lower than the reference case.

show abstract

Section: Using Co 2 As Coal Carrier: Gasifier Modeling and Feeding Tementioning

confidence: 99%

Techno-economic assessment of two novel feeding systems for a dry-feed gasifier in an IGCC plant with Pd-membranes for CO2 capture

Gazzani¹,

Turi²,

Ghoniem³

et al. 2014

International Journal of Greenhouse Gas Control

View full text Add to dashboard Cite

show abstract

“…In conclusion, the neglecting of drying and devolatilization is explained by the fact that subgrid models for coal conversion are basically split on three submodels, namely, drying, devolatilization and char conversion [8,17]. In order to validate a sub-model for the partial oxidation of a spherical nonporous char particle moving in an air/steam atmosphere, we use a comprehensive CFD-based model where the oxidation of the residual carbon, or coke, is considered.…”

Section: Cfd-based Modelmentioning

confidence: 99%

“…see the works [8] and [9,17], where the commercial software Fluent6.3. and ANSYS-Fluent12 were utilized, respectively.…”

Section: Introductionmentioning

confidence: 99%

“…and ANSYS-Fluent12 were utilized, respectively. In the case of work [17], the kinetic/diffusion rate model was modified using an additional term characterising a moving flame front. In work [9], where a kinetic/diffusion model was used, the values of the pre-exponential factor and the activation energy for some chemical reactions were "modified slightly in accordance with the comparison between numerical simulations and experimental data" (citation).…”

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

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

View full text Add to dashboard Cite

. 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

show abstract

“…CFD analysis has been carried out by many researchers to understand gasification reactions [14][15][16][17][18][19][20][21][22][23]. Chen et al [14] performed CFD modeling of a 200-ton/day, two-stage, air-blown, entrained-bed gasifier (Mitsubishi Heavy Industry, Fukushima, Japan).…”

Section: Introductionmentioning

confidence: 99%

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

2015

View full text Add to dashboard Cite

Three-dimensional computational fluid dynamics (CFD) modeling of the gasification performance in a one-stage, entrained-bed coal gasifier (Shell Coal Gasification Process (SCGP) gasifier) was performed, for the first time. The parametric study used various O2/coal and steam/coal ratios, and the modeling used a commercial code, ANSYS FLUENT. CFD modeling was conducted by solving the steady-state Navier-Stokes and energy equations using the Eulerian-Lagrangian method. Gas-phase chemical reactions were solved with the Finite-Rate/Eddy-Dissipation Model. The CFD model was verified with actual operating data of Demkolec demo Integrated Gasification Combined Cycle (IGCC) facility in Netherlands that used Drayton coal. For Illinois #6 coal, the CFD model was compared with ASPEN Plus results reported in National Energy Technology Laboratory (NETL). For design coal used in the SCGP gasifier in Korea, carbon conversion efficiency, cold gas efficiency, temperature, and species mole fractions at the gasifier exit were calculated and the results were compared with those obtained by using ASPEN Plus-Kinetic. The optimal O2/coal and steam/coal ratios were 0.7 and 0.05, respectively, for the selected operating conditions.

show abstract

Multiphysics Simulations of Entrained Flow Gasification. Part II: Constructing and Validating the Overall Model

Cited by 101 publications

References 34 publications

Techno-economic assessment of two novel feeding systems for a dry-feed gasifier in an IGCC plant with Pd-membranes for CO2 capture

Techno-economic assessment of two novel feeding systems for a dry-feed gasifier in an IGCC plant with Pd-membranes for CO2 capture

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

3-D CFD Modeling for Parametric Study in a 300-MWe One-Stage Oxygen-Blown Entrained-Bed Coal Gasifier

Contact Info

Product

Resources

About