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Energies 2020, 13, 5043 13 of 20 Table 6. NASA CEA fuel-rich exhaust compositions for methane in air scaled to 1 without nitrogen. Φ CO 1.20 0.17 1.40 0.23 1.60 0.26 1.80 0.28 2.00 0.29 2.20 0.30 2.40 0.31 2.60 0.31 2.80 0.31 H2 CO2 H2O 0.09 0.17 0.57 0.16 0.11 0.50 0.24 0.08 0.42 0.31 0.06 0.35 0.38 0.04 0.29 0.43 0.03 0.24 0.47 0.03 0.19 0.51 0.02 0.16 0.54 0.02 0.12 Figure 8 shows the trend in the variation of scaled syngas concentrations in the fuel-rich exhaust for methane combustion in air and oxygen. It is evident that the trend in Figure 7 matches the trend in the syngas composition of the fuel-rich combustion exhaust. The syngas oxidizes electrochemically and produces power in the FFC at an assumed constant fuel utilization. Hence, when the flow rates are equal, the higher syngas concentration for the methane/oxygen case will result in more electricity generation due to the constant fuel utilization in the FFC. Higher electricity generation for the methane/oxygen case will require a high flow rate (shown in Figure 7) in order to meet the thermal energy requirement of the sCO2 bottoming cycle. Figure 8. Syngas concentration in the fuel-rich combustion exhaust for methane combustion in air (without nitrogen and scaled to 1) compared to methane combustion in oxygen against increasing Φ. Figure 9 shows the power generated by the sCO2 cycle with oxygen and with air for the FFCTH. As a base case, Figure 9 shows the power generated by the standard sCO2 turbine cycle. We note that the power generated in the oxygen case includes the electrical power penalty required for sequestration (i.e., compression) of the exhaust CO2, as well as the air separation.PDF Image | Hybrid Fuel Cell Supercritical CO2 Brayton Cycle CO2 Storage
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