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TA 4.R: Supercritical Carbon Dioxide Brayton Cycle The labeled points A-H in Figure 4.R.8 correspond to state points in the recompression Brayton cycle and are also depicted on Figure 4.R.7. The operating envelope shown in Figure 4.R.8 corresponds to a recompression sCO2 Brayton cycle with a turbine inlet temperature of approximately 600°C and a cycle pressure drop of 700 kPa. Points C-H in Figure 4.R.7 are the same as for the recuperated Brayton cycle. Where the recompression cycle differs is downstream of point H. In this configuration, a portion of the low pressure CO2 exiting the recuperator bypasses the CO2 cooler and is compressed to the maximum cycle pressure in a separate compressor from the main CO2 compressor. In addition to bypassing the CO2 cooler, this stream bypasses the low temperature portion of the recuperator. The net thermal effect is to provide a better match of thermal capacity between the hot and cold sides of the recuperator and increase the overall effectiveness of the recuperator. The disadvantage of this configuration is that the cycle is more complex and an extra compressor is required. While the total amount of power required for CO2 compression actually increases in this configuration, the net cycle efficiency increase because more CO2 can pass through the cycle for any given thermal input. Note that in Figure 4.R.7, two different values of the temperature and pressure are shown for state point A. These correspond to two different scenarios for the CO2 cooler: a wet cooling case using water as the cooling medium, and a dry cooling case using air cooling. The dry cooling case has a lower efficiency than the wet cooling case but the efficiency reduction could be reduced by increasing the minimum cycle pressure. Figure 4.R.8 Pressure Enthalpy Diagram for Recompression Closed Brayton Cycle.16 The state points A through H are analogous to those shown in Figure 4.R.7. Credit: Sandia National Laboratories 7 QuadrennialTechnologyReview2015PDF Image | Advancing Clean Electric Power Technologies
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