Nonlinear analysis of current instabilities in high temperature fuel cells

Mangold, Michael; Krasnyk, Mykhaylo; Sundmacher, Kai

doi:10.1016/j.ces.2004.07.094

Cited by 20 publications

(11 citation statements)

References 10 publications

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“…To our knowledge, there are hardly any publications available on instabilities and multiplicities in high temperature fuel cells. In previous work [17], we showed that in high temperature fuel cells there may exist a thermokinetic equivalent to the autocatalytic wet spot formation in PEMFCs: The electrolyte connecting the electrodes of a high temperature fuel cell possesses an electrical conductivity that increases with temperature. Therefore, a local temperature increase may lead to higher current density, which intensifies the local electrochemical reaction rate, produces more heat and in the end may result in the formation of a hot spot.…”

Section: Introductionmentioning

confidence: 99%

Theoretical investigation of steady state multiplicities in solid oxide fuel cells*

2005

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The nonlinear steady state behaviour of solid oxide fuel cells (SOFCs) is investigated. It is found that the temperature dependence of the electrolyte conductivity has a very strong influence on the occurrence of multiple steady states, instabilities and the formation of hot spots. Two correlations from the literature for the electrolyte conductivity are studied in a lumped model and in a 1D spatially distributed model of a SOFC. The cases of galvanostatic operation, potentiostatic operation, and operation under a constant ohmic load are considered. The lumped model possesses a unique steady state under galvanostatic operation and up to three steady states under potentiostatic operation or under constant load. In the distributed model, three steady states may coexist under galvanostatic operation and up to five under potentiostatic operation. List of Symbols Bwidth of cell (m) c P molar heat capacity (J mol )1 K )1 ) C SE coefficient in Equation (24) Greek symbols a heat transfer coefficient (W m )2 K )1 ) b 1/2 coefficients in Equation (23) c pre-exponential kinetic factor (A m )2 ) g overpotential (V) h charge transfer coefficient k heat conductivity of the solid (W m )1 K )1 ) m stoichiometric coefficient q resistivity (W m) q S density of the solid (kg m )3 ) F electrical potential (V)

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Section: Introductionmentioning

confidence: 99%

Theoretical investigation of steady state multiplicities in solid oxide fuel cells*

2005

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“…For instance, the local ion conductivity grows as temperature increases, thus the current density increases at that particular location. The higher current density drives the reaction and generates more reactive heat that leads to an increase in temperature (Mangold et al, 2004). The manipulation and optimisation of the air flow rate is one of the most effective strategies for setting up and controlling an appropriate temperature distribution over the cell"s commissioning, operation and shutdown stages.…”

Section: Cell Scale Optimisation Studymentioning

confidence: 99%

Solid oxide fuel cell reactor analysis and optimisation through a novel multi-scale modelling strategy

Amiri

Vijay

Tadé

et al. 2015

Computers & Chemical Engineering

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“…In the last years, the ProMoT/Diana system has proven useful for various challenging modeling tasks, e.g., in the area of chemical engineering systems [13,14], energy systems [15], and biological systems [16,17]. ProMoT and Dia-na are free open-source software.…”

Section: Introductionmentioning

confidence: 99%

Development and Nonlinear Analysis of Dynamic Plant Models in ProMoT /Diana

Mangold

Khlopov

Danker

et al. 2014

Chemie Ingenieur Technik

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In the process design of chemical production plants, dynamic simulation plays an important role. This paper gives a short introduction to the process modeling tool ProMoT and the simulation tool Diana. Both are open‐source programs intended for the dynamic analysis of chemical engineering and biological systems. They support the implementation and analysis of large nonlinear differential algebraic systems. An overview is given on the functionality of ProMoT and Diana. The use of the tools is illustrated by their application to an innovative fluidized bed crystallization process.

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Nonlinear analysis of current instabilities in high temperature fuel cells

Cited by 20 publications

References 10 publications

Theoretical investigation of steady state multiplicities in solid oxide fuel cells*

Theoretical investigation of steady state multiplicities in solid oxide fuel cells*

Solid oxide fuel cell reactor analysis and optimisation through a novel multi-scale modelling strategy

Development and Nonlinear Analysis of Dynamic Plant Models in ProMoT /Diana

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