3D modeling of anode-supported planar SOFC with internal reforming of methane

Nikooyeh, Kasra; Jeje, Ayodeji; Hill, Josephine M.

doi:10.1016/j.jpowsour.2007.07.003

Cited by 123 publications

(81 citation statements)

References 31 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…During the fuel switch, fuel flows are adjusted in order to provide to the anode a theoretical constant number of electrons considering [2], where only H 2 is oxidised (see above). According to [1] and [2], H 2 and CH 4 give theoretically 2 and 6e -respectively. This hypothesis is confirmed below.…”

Section: Resultsmentioning

confidence: 99%

“…The performances of the fuel cell are probably diffusion-limited in a certain proportion by the catalytic layer as pointed out (2), but this aspect was not considered here. Due to the limitations mentioned above, the polarisation curves cannot be recorded in CH 4 . Accordingly, the fuel utilization was optimised using H 2 as the fuel, following the principles described above.…”

Section: Resultsmentioning

confidence: 99%

See 1 more Smart Citation

SOFC Long Term Operation in Pure Methane by Gradual Internal Reforming

et al. 2013

View full text Add to dashboard Cite

A solid oxide fuel cell was designed to be operated in pure methane, without reforming or carrier gas. The fuel cell was built up from conventional NiO-YSZ anode supported cell with a specific Pt screen-printed anodic collecting system and a Ir-CGO catalytic layer. The operation principle is based on Gradual Internal Reforming. After an initiation in H 2 for 30 minutes, the cell was operated for almost 2000 hours in pure and dry CH 4 with a fuel utilization rate of 30 %. Intrinsic gradual degradation of 15 %/1000 h was observed, but no coking occurred at the anodic side.

show abstract

Section: Resultsmentioning

confidence: 99%

Section: Resultsmentioning

confidence: 99%

SOFC Long Term Operation in Pure Methane by Gradual Internal Reforming

et al. 2013

View full text Add to dashboard Cite

show abstract

“…However, the occurrence of chemical reactions (endothermic DIR and exothermic water gas shift reaction: WGSR) complicate the SOFC temperature field and more importantly, carbon deposition can occur in an SOFC with DIR and WGS, which in turn can degrade the SOFC performance substantially [21]. Besides, both DIR and WGS reactions require steam in the anode, which can dilute the fuel concentration and reduce the SOFC performance [22,23]. In a recent study, it is found that running on methane/steam mixture without external reforming, the electrolytic effect is observed in an SOFC, at an operating potential of 0.8V [24].…”

Section: Introductionmentioning

confidence: 99%

Modeling of SOFC running on partially pre-reformed gas mixture

2012

International Journal of Hydrogen Energy

125

View full text Add to dashboard Cite

A two dimensional model is developed to study the transport and reaction processes in solid oxide fuel cells (SOFCs) fueled by partially pre-reformed gas mixture, considering the direct internal reforming (DIR) of methane and water gas shift (WGS) reaction in the porous anode of SOFC.Electrochemical oxidations of H 2 and CO fuels are both considered. The model consists of an electrochemical, a chemical model, and a computational fluid dynamics (CFD) model. Two chemical models are compared to examine their effects on SOFC modeling results. Different from the previous studies on hydrogen fueled SOFC, higher gas velocity is found to slightly decrease the performance of SOFC running on pre-reformed gas mixture, due to suppressed gas composition variation at a higher gas velocity. The current density distribution along the gas channels at an inlet temperature of 1173K is quite different from that at 1073K, as DIR reaction is facilitated at a higher temperature. It is also found that neglecting the electrochemical oxidation of CO can considerably underestimate the total current density of SOFC running on pre-reformed hydrocarbon fuels. An alternative method is proposed to numerically determine the open-circuit potential of SOFC running on hydrocarbon fuels. Electrochemical reactions are observed at open-circuit potentials.

show abstract

“…Improper management of the ratio can lead to carbon formation and thermal stress, shortening the life of SOFC. Moreover, the S/C has significant effect on the distributions of state variables within SOFC [14,15]. The exhaust fuel, containing high fractions of water steam and much of the available exhaust heat, is often recirculated in the real operations and designs of SOFC [16,17], which introduces more variations in the gaseous molar fractions and affects the management of S/C.…”

Section: Introductionmentioning

confidence: 99%

A Control‐oriented Dynamic Model Adapted to Variant Steam‐to‐carbon Ratios for an SOFC with Exhaust Fuel Recirculation

Zhang

2010

Fuel Cells

View full text Add to dashboard Cite

The steam‐to‐carbon ratio (S/C) is a typical disturbance parameter in the operation of solid oxide fuel cell (SOFC) power generation system. A planar SOFC with a pre‐reformer and exhaust fuel recirculation system is investigated in this work. A lumped, nonlinear dynamic model is developed for the SOFC with consideration both of the spatial effect and the variant S/Cs. The dynamic model is deduced based on a fitting function so‐called Exponential Association Function, which is employed to describe the spatial distribution of state variables in SOFC. Three parameters of the fitting function are identified to integrate the spatial effect and S/C effect in the model. The parameters of Exponential Association Function are determined by function fitting on three‐dimensional numerical data at the sample operation points. Carbon formation activity is analysed using the simulation results and thermodynamic data. Dynamic simulation is implemented with the help of software MATLAB/SIMULINK. The results show that the developed model has good performance in predicting the responses of the state variables and catching the changes of S/C.

show abstract

3D modeling of anode-supported planar SOFC with internal reforming of methane

Cited by 123 publications

References 31 publications

SOFC Long Term Operation in Pure Methane by Gradual Internal Reforming

SOFC Long Term Operation in Pure Methane by Gradual Internal Reforming

Modeling of SOFC running on partially pre-reformed gas mixture

A Control‐oriented Dynamic Model Adapted to Variant Steam‐to‐carbon Ratios for an SOFC with Exhaust Fuel Recirculation

Contact Info

Product

Resources

About