The three-dimensional and dynamic performance of a molten carbonate fuel cell (MCFC) stack operating under load-following modes have been investigated by using dynamic simulation. The major processes with regard to an MCFC's safe and efficient operation in power-generation systems, such as the mass and heat transport, chemical. reactions and electrical power generation,' arc formulated in a three-dimensional, time-dependent form using the computational-fluid-dynamics (CFD) technique. The grid definitions have been explained, and a simple test to determine whether the simulation results being acceptable has been introduced. In this paper, the model performance is demonstrated by applying it to calculate the distributions,of current density and temperature under a step change.

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