The objective of this investigation is to analyze the impact of the flue
gas recirculation (FGR) ratio on the different energy inputs and outputs of a
SNGCC power plant as well as its overall efficiency. Simulation results
indicate that increasing flue gas recirculation increases the energy consumed
by the recirculation compressor and the energy produced by the gas turbine. On
the other hand, it decreases the production of energy of the steam turbine and
the energy consumed by the pump of the steam cycle. The overall energy
efficiency of the SNGCC power plant is highest (41.09%) at a value of 0.20 of
the flue gas recirculation. However, the flue gas composition with a FGR ratio
of 0.37 is more suitable for effective absorption of carbon dioxide by amine
solutions. Based on the low heating value (LHV) of hydrogen, the corresponding
overall efficiency of the power plant is 39.18% and the net power output of the
plant is 1273 kW for consumption of 97.5 kg/hr. of hydrogen.
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