Abstract
In this paper, a detailed model incorporating simplified geometric resolution of a molten carbonate fuel cell (MCFC) with detailed and dynamic simulation of all physical, chemical, and electrochemical processes in the stream-wise direction is presented. The model was developed using mass and momentum conservation, electrochemical and chemical reaction mechanisms, and heat-transfer. Results from the model are compared with data from an experimental MCFC unit. Furthermore, the model was applied to predict dynamic variations of voltage, current and temperature in an MCFC as it responds to varying load demands. The voltage was evaluated by applying a model developed by Yuh and Selman [1, 2]. The results show that the model can be used to predict voltage and dynamic response characteristics of an MCFC accurately and consistently for a variety of temperatures and pressures.
Highlights
AND BACKGROUNDMolten carbonate fuel cells (MCFC) are currently used in commercial power-generation systems with proven high efficiency and low emissions performance
The dynamic operation of systems based on this emerging molten carbonate fuel cell (MCFC) technology are complex and include, for example, the interaction between electrochemical, physical, chemical, and thermal processes
High fidelity models that can accurately capture the dynamic behaviour of the fuel cell and identify the thermal gradients within the cell are highly desirable
Summary
AND BACKGROUNDMolten carbonate fuel cells (MCFC) are currently used in commercial power-generation systems with proven high efficiency and low emissions performance. For the channels, all of the dynamic conservation equations (mass, species, momentum, and energy) are solved simultaneously. At any point in time the local current production depends upon local bulk species concentrations in the anode and cathode compartments, an iteratively determined cell voltage (using an electrode equipotential assumption), and the local polarizations.
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