Abstract
AbstractA simple solid oxide fuel cell plant is analysed based on the first law of thermodynamics approach. This system consists of a solid oxide fuel cell stack, a steam reformer, a mixer, a vaporiser, an afterburner, and two pre‐heaters. To simplify the study, the enthalpy at each node of the system is normalized with the lower heating value of the inlet fuel. A gas dynamic model for calculating the flow in the pipes connecting the system components is considered and can be used to estimate the flow velocity and friction‐induced pressure drop in the piping. Though the effect of a friction‐induced pressure drop can be significant in a sizeable integrated solid oxide fuel cell‐gas turbine power plant, it does not significantly affect the plant efficiency in this study, due to rather short piping used in this simple power system. A steady flow energy equation and the Rayleigh line flow assumption are applied to the afterburner to calculate the exit flow temperature, velocity and pressure.
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