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Energies 2020, 13, 5043 16 of 20 Table 7. Comparison of electrical efficiency changes due to addition of carbon sequestration into the system in previous cases and current case. Type of Power Generation Technique Gas turbine Gas turbine Gas turbine +SOFC sCO2 turbine sCO2 turbine + FFC Base Case Electrical Efficiency 53.67 43.88 Maximum of 69.5 53.14 Maximum of 60 Electrical Efficiency with CO2 Sequestration 46.75 35.26 Maximum of 65.7 51.7 Maximum of 59.3 Reference [36] [37] [48] This work This work We assumed earlier that the heat rejected by the system from the pre-cooler can provide heat for air separation. It is thus important to consider the P/H of the system to evaluate its ability to efficiently convert the incoming fuel energy to electricity compared to heat and make the system sequestration-ready. Since the parameters of the sCO2 cycle are constant, the heat rejected from the pre-cooler is also constant at 4.81 MW. Figure 11 shows the P/H of the proposed system with oxygen and with air and a comparison to a standard sCO2 turbine system. The P/H of the FFCTH is greater than the standard sCO2 turbine system at all Φ due to larger power generation. The P/H of the FFCTH with oxygen (sequestration-ready) is much higher than with air (not sequestration-ready) at all Φ. The highest P/H for sequestration-ready is 116 times that without at Φ = 2.8. This is primarily because the oxygen separation uses most of the rejected heat from the sCO2 cycle. Thus, minimum heat remains. Figure 11. P/H ratios of the system with and without the FFC integrated with and without being CO2 sequestration-ready at various Φ. 5. Conclusions and Future Work In this paper, we provided a comprehensive analysis of a novel FFCTH. The system is novel in terms of its attractive efficiency without but also with sequestration-ready CO2 emissions. The FFC provides heat for the sCO2 cycle as opposed to a combustor in the standard sCO2 cycle. Experimental characterization of the FFC assessed power density and efficiency. It also provided FFC parameters,PDF Image | Hybrid Fuel Cell Supercritical CO2 Brayton Cycle CO2 Storage
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