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Based on a three-shaft 250 MW thermal HTGR, we summarize cycle sensitivities to key cycle parameters shown in Table 2. Table 2. Cycle efficiency sensitivity to key cycle parameters. Cycle parameters Change in cycle parameter Change in cycle efficiency (%) +2.1 +1.6 -0.1 -1.2 +0.8 +1.0 Turbine inlet temperature +50 C Recuperator efficiency +1% Reactor vessel cooling flow +1% Compressor inlet +5.0 C temperature Compressor efficiency +1% Turbine efficiency +1% In order to check the accuracy of HYSYS simulation, the CO2 pressure-enthalpy diagram was used to compare with HYSYS simulation results. The method used is the same procedure described above. Figures 11 and 12 illustrate how to obtain the HPC exit temperature of 113°C from the P-H diagram. Figure 11 shows HYSYS results for one case using CO2 with a HPC exit temperature of 113°C. We need to validate this temperature using the P-H diagram shown in Figure 12. As shown in Figure 12, once the red point 2 in step 3 described above is determined, the temperature isotherm line is crossed at 113°C, which is the same result obtained from the HYSYS simulation. Intercooler m = 696.9 kg/s T = 30. C P = 3199 kPa Inlet H= -8977.2 kJ/kg HPC Recuperator HPC Exit Temperature Check on CO2 Brayton cycle Q = 3.8196e4 kW Efficiency = 0.9 T = 113. C P = 8149 kMPa Outlet H = -8922.4 kg/kg Delta H= isentropic enthalpy change = 54.8 kJ/kg OR Delta H = Q/m = 3.8196e4/696.9 = 54.8 kJ/kg Polytropic enthalpy change = isentropic enthalpy change / efficiency = 60.9 kJ/kg Figure 11. Stream property of the inlet and outlet of the high-pressure compressor from HYSYS simulation. 9PDF Image | Development of a Supercritical Carbon Dioxide Brayton Cycle: Improving PBR Efficiency and Testing Material Compatibility
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