Three-dimensional simulation of chemically reacting gas flows in the porous support structure of an integrated-planar solid oxide fuel cell

Haberman, B. A.; Young, J. B.

doi:10.1016/j.ijheatmasstransfer.2004.04.010

Cited by 292 publications

(142 citation statements)

References 21 publications

Supporting

Mentioning

138

Contrasting

Unclassified

Order By: Relevance

“…For AV MSR an average value of 10·10 6 m 2 /m 3 is applied in this work, which can be compared to 70·10 6 m 2 /m 3 , that is the measured specific surface area for Ni/YSZ material developed for SOFC anodes [46]. Based on the global scheme for the anode, the expression for the catalyzed water-gas shift reaction from Haberman and Young [52] has been selected in this study:…”

Section: Internal Reforming Reactionsmentioning

confidence: 99%

See 1 more Smart Citation

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

Andersson

Yuan

Sundén

2013

Journal of Power Sources

131

View full text Add to dashboard Cite

Fuel cells are promising for future energy systems, because they are energy efficient and able to use renewable fuels. A fully coupled computational fluid dynamics (CFD) approach based on the finite element method, in twodimensions, is developed to describe a solid oxide fuel cell (SOFC). Governing equations for, gas-phase species, heat momentum, ion and electron transport are implemented and coupled to kinetics describing electrochemical and internal reforming reactions. Both carbon monoxide and hydrogen are considered as electrochemical reactants within the anode. The predicted results show that the current density distribution along the main flow direction depends on the local concentrations and temperature. A higher (local) fraction of electrochemical reactants increases the Nernst potential as well as the current density. For fuel mixtures without methane, the cathode air flow rate needs to be increased significantly to avoid high temperature gradients within the cell as well as a high outlet temperature.

show abstract

Section: Internal Reforming Reactionsmentioning

confidence: 99%

“…The rate constant (k WGSR ) and the equilibrium constant (K WGSR ) are temperature dependent expressions calculated from the experimental data, as described in [52]. To verify if the WGSR is close to equilibrium or not, the rate constant (k WGSR ) is increased 20 times.…”

Section: Internal Reforming Reactionsmentioning

confidence: 99%

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

Andersson

Yuan

Sundén

2013

Journal of Power Sources

131

View full text Add to dashboard Cite

show abstract

“…where y i is the molar fraction of species i, e the porosity of the electrode, R WGSR the reaction rate of WGSR predicted by (Haberman and Young, 2004;Ni, 2012a;Ridler and Twigg, 1989), D eff ij the effective binary diffusion coefficient of species i and j, D eff i;k the effective Knudsen diffusion coefficient of species i, _ N i the species flux, and B the electrode permeability. The binary diffusion coefficients are calculated based on the Chapman-Enskog theory, the Knudsen diffusion coefficients based on the Knudsen theory, and the diffusivities corrected by porosity-tortuosity terms to account for the porous media (effective diffusivities).…”

Section: Electrolyzer Performance Modelmentioning

confidence: 99%

Techno-economic modeling and optimization of solar-driven high-temperature electrolysis systems

Lin

Haussener

2017

Solar Energy

View full text Add to dashboard Cite

a b s t r a c tWe present a techno-economic analysis of solar-driven high-temperature electrolysis systems used for the production of hydrogen and synthesis gas. We consider different strategies for the incorporation of solar energy, distinguished by the use of differing technologies to provide solar power and heat: (i) thermal approaches (system 1) using concentrated solar technologies to provide heat and to generate electricity through thermodynamic cycles, (ii) electrical approaches (system 2) using photovoltaic technologies to provide electricity and to generate heat through electrical heaters, and (iii) hybrid approaches (system 3) utilizing concentrated solar technologies and photovoltaics to provide heat and electricity, respectively. We find that system 3 generates hydrogen at a high efficiency (g STF = 9.9%, slightly lower than the best performing system 1 with 10.6%) and at a low cost (C fuel = $4.9/kg, lowest cost of all three systems) at reference conditions, providing evidence for the competitiveness of this hybrid approach for scaled solar hydrogen generation. Sensitivity analysis indicates an optimal working temperature for system 3 of 1350 K, which balances the increased thermal receiver losses with the reduced electrolysis cell potential when increasing the temperature. Lower working pressure always favors high system efficiency and low cost. The working current densities for thermoneutral voltage were determined for various temperature and pressure combinations, and trends for efficient and cost-effective thermoneutral operation were identified. The water conversion extent was optimized to avoid mass transport limitations in the electrodes while ensuring large fuel generation rates. For synthesis gas production, a H 2 /CO molar ratio of 2 can be achieved by tuning the inlet feeding molar ratio of CO 2 / H 2 O, temperature, and pressure. This study introduces a flexible simulation framework of solar-driven high-temperature electrolysis systems allowing for the assessment of competing solar integration approaches and for the guidance of the operational conditions maximizing efficiency and minimizing cost, providing pathways for scalable solar fuel processing.

show abstract

“…Based on the global scheme for the anode, the expression for the catalyzed water-gas shift reaction from Haberman and Young [44] has been selected in this study:…”

Section: Reforming Reactionsmentioning

confidence: 99%

“…The rate constant (k WGSR ) and the equilibrium constant (K WGSR ) are temperature dependent expressions calculated from the experimental data, as described in [44].…”

Section: Reforming Reactionsmentioning

confidence: 99%

Comparison of humidified hydrogen and partly pre-reformed natural gas as fuel for solid oxide fuel cells applying computational fluid dynamics

Andersson

Nakajima

Shimizu

et al. 2014

International Journal of Heat and Mass Transfer

View full text Add to dashboard Cite

Three-dimensional simulation of chemically reacting gas flows in the porous support structure of an integrated-planar solid oxide fuel cell

Cited by 292 publications

References 21 publications

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

SOFC modeling considering hydrogen and carbon monoxide as electrochemical reactants

Techno-economic modeling and optimization of solar-driven high-temperature electrolysis systems

Comparison of humidified hydrogen and partly pre-reformed natural gas as fuel for solid oxide fuel cells applying computational fluid dynamics

Contact Info

Product

Resources

About