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Development Of A Supercritical Carbon Dioxide Brayton Cycle

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Development Of A Supercritical Carbon Dioxide Brayton Cycle ( development-of-supercritical-carbon-dioxide-brayton-cycle )

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Table 3-18. Component sizing data fro combined cycle with helium working fluid. Component Value Gas Turbine work (MW) 314.6 Steam Turbine work (MW) 174.3 Compressor work (MW) 200.0 Pump work (MW) 2.4 Circulator work (MW) 27.5 IHX volume (m3) 80.4 HTLHX volume (m3) 1.7 Steam generator volume (m3) 330.8 CO2 Working Fluid The CO2 working fluid was optimized for the combined cycle with a pressure ratio of 7.72 and an efficiency of 48.76%. The secondary mass flow rate was optimized at 1113 kg/s. The HYSYS simulation is illustrated in Figure 3-22, the T-S diagram is shown in Figure 3-24 and the state points are summarized in Table 3-19. The total heat exchanger volume was 366.9 m3 and the total cycle work was 662.2 MW. Table 3-20 lists the individual component sizing results for the cycle. Parametric studies away from the baseline values of the systems were performed on the three-shaft and combined cycles to determine the effect of varying conditions in the cycle. This gives some insight into the sensitivity of these cycles to various operating. The parametric studies were carried out by isolating and varying a single working condition. Once the working condition was changed the cycle was optimized using the methods discussed in Section 2-4-4. Figure 3-22. HYSYS diagram of Brayton top cycle with CO2 working fluid. 49

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