Plant layout optimization has to account with operating conditions suitable for long term fuel cell operation.
From the CO2 separation point of view, it has to be considered that the MCFC cannot completely exploit the CO2
contained in the stream which feeds the cathode, nor to oxidize all the fuel introduced, while maintaining a high
conversion efficiency. The first limitation requires to set a compromise between the fraction of CO2 separated and
the plant performance, reaching a balance which is influenced by the choices on the cycle configuration (variation of
CO2 fraction in the cathode stream due to recycling of exhaust streams, use of residual fuel stream in the gas
turbine). The second issue is given by the fact that the MCFC generates at anode outlet a stream mainly composed
of CO2 and water but still containing significant fractions of residual, non-oxidized, CO and H2. Following the
results of previous works [3,4], two strategies are compared here to recover the heating value of CO and H2 while
preserving high CO2 purity in the stream:
Plant layout optimization has to account with operating conditions suitable for long term fuel cell operation.
From the CO2 separation point of view, it has to be considered that the MCFC cannot completely exploit the CO2
contained in the stream which feeds the cathode, nor to oxidize all the fuel introduced, while maintaining a high
conversion efficiency. The first limitation requires to set a compromise between the fraction of CO2 separated and
the plant performance, reaching a balance which is influenced by the choices on the cycle configuration (variation of
CO2 fraction in the cathode stream due to recycling of exhaust streams, use of residual fuel stream in the gas
turbine). The second issue is given by the fact that the MCFC generates at anode outlet a stream mainly composed
of CO2 and water but still containing significant fractions of residual, non-oxidized, CO and H2. Following the
results of previous works [3,4], two strategies are compared here to recover the heating value of CO and H2 while
preserving high CO2 purity in the stream:
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