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Energies 2020, 13, 5043 14 of 20 Figure 9. Comparison of the power generated by the sCO2 turbine with and without FFC integrated and with and without being CO2 sequestration-ready. As shown in Figure 9, the power generated by the FFCTH increases with increasing Φ. This increase occurs because increasing the Φ increases the concentration of syngas in the fuel-rich combustion exhaust as shown in Table 1. Electrochemical oxidation of the syngas generates power; hence, more syngas leads to more electrical power generated as long as the fuel utilization remains high. Figure 5 shows the same trend for the experimental results, which confirms the trend and explains the model results. The total power generated by the FFCTH system with and without being CO2 sequestration-ready follows a slightly different trend than the one in Figure 7. This difference is primarily due to the compression penalty for making the exhaust CO2 sequestration-ready. The power required for sequestration is small (0.1 MW) in comparison to the total power generated (~9.6 MW) at Φ = 2.8. The total power generated by the FFCTH with being CO2 sequestration-ready is 7% higher at Φ = 1.2 and 1.2% lower at Φ = 2.8 compared with no sequestration intent. It can also be seen that the total power generated by the FFCTH is significantly higher (~60% higher at Φ = 2.8) compared to the standard sCO2 turbine due to a large portion of the total power being generated by the FFC and the higher methane flow rate. Thus, analytical results show that the power generated by various cycles considered follows a slightly different trend than the trend for methane flow rate described earlier. Figure 10 shows the variation of the electrical efficiency of the FFCTH system with and without CO2 sequestration compared to the electrical efficiency of the standard sCO2 turbine system with and without CO2 sequestration. The standard sCO2 turbine system was assessed with and without carbon-sequestration to assess the penalty for the baseline case. As expected, the electrical efficiency of the FFCTH system and the standard sCO2 cycle is higher without sequestration than with sequestration.PDF Image | Hybrid Fuel Cell Supercritical CO2 Brayton Cycle CO2 Storage
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