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Table 3-20. Component sizing data for combined cycle with CO2 working fluid. Component Value Gas Turbine work (MW) 293.1 Steam Turbine work (MW) 170.6 Compressor work (MW) 179.1 Pump work (MW) 2.3 Circulator work (MW) 17.1 IHX volume (m3) 48.5 HTLHX volume (m3) 2.6 Steam generator volume (m3) 315.8 Nitrogen-Helium Working Fluid The N2-He mixture was optimized for the combined cycle with a pressure ratio of 2.712 and an efficiency of 47.24%. The secondary mass flow rate was optimized at 759 kg/s. The total heat exchanger volume was 405.7 m3 and the total cycle work was 727.4 MW. Table 3-21 lists the individual component sizing results for the cycle. Table 3-21. Component sizing data for combined cycle with a nitrogen-helium mixture. Component Value Gas Turbine work (MW) 315.4 Steam Turbine work (MW) 176.3 Compressor work (MW) 201.8 Pump work (MW) 2.4 Circulator work (MW) 31.5 IHX volume (m3) 71.7 HTLHX volume (m3) 1.7 Steam generator volume (m3) 332.3 Parametric studies were performed on the reactor outlet temperature, secondary mass flow rate, pressure, and turbine for the 3 working fluids. The results are summarized in Figure 3-24, Figure 3-25, Figure 3-26 and Table 3-21. All three working fluids behaved similarly under off normal working conditions. However, helium was less affected by pressure that CO2 and the N2-He mixture. The effect of turbine cooling on the system was an approximately 0.5% efficiency decrease for all working fluids. 51PDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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