CFD simulation tool for solid oxide fuel cells

Autissier, Nordahl; Larrain, Diego; herle, Jan Van; Favrat, Daniel

doi:10.1016/j.jpowsour.2003.11.089

Cited by 96 publications

(74 citation statements)

References 5 publications

Supporting

Mentioning

Contrasting

Unclassified

Order By: Relevance

“…Numerous SOFC models considering the intricate interdependency among ionic and electronic conduction, gas transport phenomena, and electrochemical processes have been reported in the literatures for pure hydrogen, syngas or methane [10][11][12][13][14][15][16][17][18][19][20]. Hecht et al [21] further reported a multi-step heterogeneous elementary reaction mechanism for CH 4 reforming using Ni as catalyst.…”

Section: Dcfcmentioning

confidence: 99%

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Shi

Wang

et al. 2013

Journal of Power Sources

View full text Add to dashboard Cite

A detailed mechanistic model for solid oxide electrolyte direct carbon fuel cell (SO-DCFC) is developed while considering the thermo-chemical and electrochemical elementary reactions in both the carbon bed and the SOFC, as well as the meso-scale transport processes within the carbon bed and the SOFC electrode porous structures. The model is validated using data from a fixed bed carbon gasification experiment and the SO-DCFC performance testing experiments carried out using different carrier gases and * Corresponding author. Tel.: +86-10-62789955; Fax: +86-10-62770209.Email: shyx@tsinghua.edu.cn.2 at various temperatures. The analyses of the experimental and modeling results indicate the strong influence of the carrier gas on the cell performance. The coupling between carbon gasification and electrochemical oxidation on the SO-DCFC performance that results in an unusual transition zone in the cell polarization curve was predicted by the model, and analyzed in detail at the elementary reaction level. We conclude that the carbon bed physical properties such as the bed height, char conversion ratio and fuel utilization, as well as the temperature significantly limit the performance of the SO- DCFC.Key words: solid oxide electrolyte; direct carbon fuel cell; elementary reaction; modeling; heterogeneous chemistry This work is focuses on the solid oxide electrolyte direct carbon fuel cells (SO-DCFC) which are capable of conversing chemical energy in the solid carbon fuel into electricity.These offer a number of advantages over the traditional carbon conversion technologies 3 as well as alternative DCFCs such as: the abundance of the fuel source, high theoretical efficiency, high CO 2 emission reduction potential, relatively higher reaction activity ascribed to its high operating temperatures, and avoidance of liquid electrolyte consumption, leakage and corrosion [3]. Due to these advantages, some researchers have investigated DFFCs for application in large-scale power plants [4,5] considering their potential merits for high efficiency and emission reduction.SO-DCFC performance improvement relies on optimal electrochemical reactions, carbon gasification and mass transport processes. Since experimental studies on SO-DCFC are rather complex, expensive, and time-consuming, comprehensive mathematical models are essential for the technology development. A validated mechanistic model would offer means to gain insight into the complex physical phenomena governing fthe uel cell performance that is not readily accessible experimentally, and it can also be useful tool for cell design and operating condition optimization.Modeling and experimental studies of SO-DCFCs have been reported recently by several researchers [6][7][8][9]. Numerous SOFC models considering the intricate interdependency among ionic and electronic conduction, gas transport phenomena, and electrochemical processes have been reported in the literatures for pure hydrogen, syngas or methane [10][11][12][13][14][15][16][17][18][19][20]. Hecht et al. [21]...

show abstract

Section: Dcfcmentioning

confidence: 99%

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Shi

Wang

et al. 2013

Journal of Power Sources

View full text Add to dashboard Cite

show abstract

“…The gas inlet pressure was 13 psi, which can be converted to a gas velocity of 289 m·s ¹1 with an initial gas temperature of 278.15 K. The cooling air inlet velocity was 300 m·s ¹1 with a constant temperature of 278.15 K, and the sample temperature was initially set to be 523.15 K. Using the volume-weighted mixing law for individual heat capacities, the heat capacity of the mixture can be determined. 25 …”

Section: Numerical Detailsmentioning

confidence: 99%

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates

et al. 2012

View full text Add to dashboard Cite

In this work, experimental results on the morphology and adhesive characteristics of flame-sprayed Ni20 mass%Cr coating layers deposited on preheated SCM415 surfaces are presented. The flame spray distance was varied from 100 to 200 mm so as to investigate the change in the adhesive strength of the deposited layers. Commercially available Ni20 mass%Cr particles with a mean diameter of 45 µm were employed in the experiments, and computational fluid dynamics (CFD) simulations using a commercial code (FLUENT) were conducted so as to estimate the temperature and velocity distributions of continuous and discrete phases before impact on the substrate. From FE-SEM images of the deposited layers, it was observed that, as the flame spray distance decreased, the metal particle morphology exhibited a splash-like pattern and a short, stretched shape. Such morphological characteristics were induced by the higher particle momentum associated with very high gas velocities. In addition, as the flame spray distance decreased, the adhesive strength between the deposited layer and the substrate increased due to the stronger momentum of the molten metal particles.

show abstract

“…The gas inlet pressure was 13 psi and it was converted to the velocity of 289 m/s with initial gas temperature of 278.15 K. The cooling air inlet velocity was 300 m/s with constant temperature of 278.15 K and the sample temperature was initially 523.15 K. Using the volume weighted mixing law of individual heat capacities, the heat capacity of the mixture is calculated. 22,23) For the combustion model, we used the chemical reaction formulae of 2C 2 H 2 + 5O 2 ! 4CO 2 + 2H 2 O and the global reaction.…”

Section: Numerical Detailsmentioning

confidence: 99%

Flattening Characteristics of Ni<SUB>20</SUB>Cr Thermal-Sprayed Coating Layers on Preheated SCM415 Substrates

Shin

Lee

Wi³

et al. 2011

Mater. Trans.

View full text Add to dashboard Cite

The preheating effect of SCM415 steel substrates on the flattening behavior of Ni 20 Cr flame-sprayed particles was investigated in a temperature range from 278 K to 523 K. In the present study, we calculated the particle temperature and velocity distributions of the continuous and discrete phases before collision with the substrate by using a computational fluid dynamics (CFD) code of Fluent (ver. 6.3.26). Particle velocity and gas temperature decreased rapidly in the radial direction while the particles traveled toward the substrate, suggesting that substrate size and distance from the nozzle should be carefully controlled to improve coating quality. The conventional flame spray gun was used to accelerate molten particles and K-type thermocouples were used to monitor the substrate temperature during a preheating process. Commercially available nickel-based Ni 20 Cr particles with a mean diameter of 45 mm and 20 mm were used for experiments to examine the particle size effect on the coating characteristics. Herein we present FE-SEM images of coated layers on the substrates. As the substrate preheating temperature increased, the flatter surface morphology was seen at the interface between substrate and coating layer because of better wetting and corresponding higher shear adhesion strength. Moreover, the splat morphology was significantly dependent on the particle size.

show abstract

CFD simulation tool for solid oxide fuel cells

Cited by 96 publications

References 5 publications

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates

Flattening Characteristics of Ni<SUB>20</SUB>Cr Thermal-Sprayed Coating Layers on Preheated SCM415 Substrates

Contact Info

Product

Resources

About

CFD simulation tool for solid oxide fuel cells

Cited by 96 publications

References 5 publications

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Experimental characterization and elementary reaction modeling of solid oxide electrolyte direct carbon fuel cell

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni&ndash;20 mass%Cr Layers on SCM415 Substrates

Flattening Characteristics of Ni<SUB>20</SUB>Cr Thermal-Sprayed Coating Layers on Preheated SCM415 Substrates

Contact Info

Product

Resources

About

Effect of Flame Spray Distance on the Adhesive Characteristics of Ni–20 mass%Cr Layers on SCM415 Substrates