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40 38 36 34 32 30 Pressure Ratio 2.7 Pressure Ratio 2.75 Pressure Ratio 2.8 Pressure Ratio 2.85 Pressure Ratio 2.9 Pressure Ratio 2.95 Pressure Ratio 3 Pressure Ratio 3.05 Pressure Ratio 3.1 0 0.5 1 1.5 2 Real Second Turbine Pressure Ratio / Equally Split Pressure Ratio Figure 4.20 Effect of different pressure ratio split between the reheat stages Figure 4.20 shows this behavior. The pressure ratios of both turbines were varied in a way to yield a constant total pressure ratio. If the ratio of pressure ratios is unity the pressure ratios across both turbines are the same. When the high-pressure turbine pressure ratio was reduced the low-pressure turbine pressure ratio was correspondingly increased. As one may see from Figure 4.20 the optimum value is very close to 1, but not exactly 1. This shows the effect of the real gas properties. However, since the difference between the optimum value and the equal pressure ratio split is very small (efficiency reduction less than 0.001 %) the value of 1 will be used for the subsequent optimization of the re-heated cycle. As will be shown later when the CO2 properties change more rapidly, i.e. compressor region, this effect is more pronounced and should be taken into account during the optimization. As can be seen from Figure 4.21 the effect of re-heat is strongly dependent on the pressure drop in the re-heater. Unlike in the case of a steam cycle, where the expansion is performed to vacuum conditions, the reduction of turbine work for a gas cycle yields a significant reduction of the beneficial effect of re-heating. As the pressure difference 94 Cycle Efficiency (%)PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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