ChemInform Abstract: Theoretical Analysis of High Fuel Utilizing Solid Oxide Fuel Cells

Nehter, Pedro

doi:10.1002/chin.200850235

Cited by 5 publications

(5 citation statements)

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“…For incompressible, steady, laminar and low speed, the energy equation is as follows 24 :

\nabla . (ρ C_{p} u . T - K \nabla T) = Q

where

Q

is the heat source caused by the resistance of ion electronic transport in each of the three layers,

ρ

is density,

C_{p}

is heat capacity, and is calculated by:

Q = \frac{j_{io}^{2}}{σ_{io}}

…”

Section: Problem Definitionmentioning

confidence: 99%

Distribution of SOFC thermal stress via helium gas (He) based cooling system

Fahs,

Ghassemi,

Fahs

2023

Env Prog and Sustain Energy

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Some electrochemical devices, such as fuel cells, transforms chemical energy to electricity. The main issue of SOFC's is the thermal stress caused by high operating temperature (700–1000°C). Thermal stress leads to crack initiation and propagation that in turn leads to gas leakage, structure instability and abrupt termination of the fuel cell (estimated in our previous work; 1.5% displacement of cathode electrode and the lifetime decreases by 40%–50%). The purpose of the current study is to show the influence of helium gas cooling system on SOFC cell performance. Using the coupled governing nonlinear differential equations, heat transfer, fluid flow, mass transfer, mass continuity, tortuosity effects and momentum. An in‐house computer code based on finite element method (FEM), computational structural mechanics, and the computational fluid dynamics (CFD) was utilized. The temperature and stress distribution are calculated using the Navier–Stokes thermo‐fluid, Darcy and energy models. The Results demonstrate that there is a high thermal stress and displacement in the absence of He gas cooling system, but in the case of He cooling system, thermal stress is much less and no displacement is noticed, which leads to an increase of the fuel cell's lifetime up to 35%–40%.

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“…For incompressible, steady, laminar and low speed, the energy equation is as follows 24 :

\nabla . (ρ C_{p} u . T - K \nabla T) = Q

where

Q

is the heat source caused by the resistance of ion electronic transport in each of the three layers,

ρ

is density,

C_{p}

is heat capacity, and is calculated by:

Q = \frac{j_{io}^{2}}{σ_{io}}

…”

Section: Problem Definitionmentioning

confidence: 99%

Distribution of SOFC thermal stress via helium gas (He) based cooling system

Fahs,

Ghassemi,

Fahs

2023

Env Prog and Sustain Energy

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“…The energy equation for laminar, steady, incompressible, and low speed is given by 26 :

\nabla . ((), normalρ C_{p} boldu . normalT - normalK \nabla normalT) = normalQ

where ρ is the density, C p is the heat capacity at constant pressure, and Q is the heat source due to ion electronic transport resistance in each of the three layers and is determined by:…”

Section: Problem Definitionmentioning

confidence: 99%

Numerical study of detecting crack initiation in a planar solid oxide fuel cell

Fahs

Ghassemi

Fahs

2020

Env Prog and Sustain Energy

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Converting chemical energy into electricity is done by an electrochemical device known as a fuel cell. Thermal stress is caused by high operating temperature, between 700 and 1,000 C, of solid oxide fuel cell (SOFC). Thermal stress is the main cause of crack initiation and crack propagation. This phenomenon may cause gas leakage, structure instability and cease operation of the SOFC before its lifetime. The aim of this study is to present a method that predicts the initiation of cracks in an anisotropic porous planar SOFC. The coupled governing nonlinear differential equations are solved numerically as for heat transfer, fluid flow, mass transfer, mass continuity, and momentum. An in-house computer code which is based on computational fluid dynamics, computational structural mechanics and extended finite element method is utilized and developed. This code, according to Darcy and Navier-Stokes thermofluid model, determines the temperature and stress distribution. The results show that the highest thermal stress occurs at the upper corners of cathode and at the lower corners of the anode. The maximum temperature occurs at the middle of the electrolyte cathode and electrolyte anode, while the maximum pressure occurs at the middle of the upper and lower section of the anode and cathode. In addition, the thickness of the cathode electrode at the left side is increased by 1.5%. Finally, the crack initiation occurs at the left side between the upper and lower corners of the cathode.

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“…Unfortunately, there is no understanding in the literature of the detailed mechanism of anode metal oxidation in purely CO/CO 2 mixtures. The onset of oxidation was therefore predicted by comparing the potential of the anode with that implied by the oxygen activity of the metal/metal oxide system, an approach that has been used for predicting nickel oxide formation in H 2 /H 2 O mixtures [17]. Oxide formation is favoured when the anode potential is less negative than that of the metal/metal oxide system.…”

Section: Co Oxidationmentioning

confidence: 99%

Carbon-Fuelled Solid Oxide Cells for Military Applications

2013

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We are evaluating the suitability of solid oxide cells for efficient power generation from carbons delivered as solids to the anode space in order to satisfy the requirements of military applications such as waste-to-energy and portable power. Ample evidence in the literature testifies to the feasibility of this concept. In order to de-risk a portable battery system based on this concept, consideration is given in this paper to the anode type, gasification rate of carbons, heat and mass transfer within the cell and the control of a complete system.A palladium-based anode is preferred for operation of a cell with carbon adjacent to the anode since the electrical performance is higher and it is more resistant to oxidation under fuel starved conditions than traditional nickel anodes. There is ample experimental evidence that carbon can gasify in CO 2 at sufficient rate to support operation of a battery system based on cells bearing these anodes. In fact, cell modelling suggests it is the activity of the anode that is limiting. There are significant heat and mass transfer effects within the components of the cell, but these may not prevent the achievement of sufficient electrical performance to enable a portable system. System modelling suggests such a system at the 150 W scale and equipped with enough carbon for 12 hour operation could be 48% efficient.

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ChemInform Abstract: Theoretical Analysis of High Fuel Utilizing Solid Oxide Fuel Cells

Cited by 5 publications

References 0 publications

Distribution of SOFC thermal stress via helium gas (He) based cooling system

Distribution of SOFC thermal stress via helium gas (He) based cooling system

Numerical study of detecting crack initiation in a planar solid oxide fuel cell

Carbon-Fuelled Solid Oxide Cells for Military Applications

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