MODELING OF SOLID OXIDE FUEL CELL SYSTEM

Solid oxide fuel cells (SOFCs) are expected to be widely applicable for both small and large-scale power generation systems. The reason is that the SOFC is simple highly efficient tolerant to impurities and can at least partially internally reform hydrocarbon fuels. A multi-physics multi-scale model structure is proposed by integrating three submodels i.e. a macro-continuum model a micro-scale model (random walk model) and an atomistic-level model. This multi-scale model has the capability of handling transport mechanisms on different length scales at the same time. The coarsest macro-continuum model is first proposed to simulate all energy transport processes in an electrolyte-/anode-supported SOFC. Then a novel micro-level model (random walk model) is developed to investigate the electrochemical performance in a composite electrode. Finally a multi-scale model by combining the developed macro-level model and micro-level model is proposed for a lower temperature SOFC. Based on this multi-scale model the dependence of electrochemical performance on the global parameters and micro-structures is assessed for the entire fuel cell stack.