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Spliter 2 14 Turbine Generator HP 21 Compressor IHX 1 20 13 11 4 12 Turbine IC Compressor IC LP Compressor IC Compressor 17 15 LPG 19MP 3 IHX 10 MP LP G Turbine Turbine 18 IHX 5 7 Turbine 9 8 HP G 6 Mixer Circulator 16 IHX Figure 3-17. Cycle layout with multiple reheat option. In order to improve the overall plant cycle efficiency by the combination of the increased efficiency of each component in the secondary side of the VHTR, we performed a number of HYSYS simulation to investigate interstage heating and cooling (IH&C). IH&C is an attractive option for improving the efficiency of the NGNP power conversion system. As additional stages are added, the average temperature over which input energy is added stays higher and/or the average temperature over which rejection energy is removed stays lower. If this were the only impact of the IH&C, the cycle efficiency would always increase with more stages. But with each additional stage, pressure drop is present. Additional interstage pumping must be accomplished to make up for this additional pressure drop. Because the pumps are not 100% efficient, eventually the entropy loss during an additional pumping operation results in a smaller total energy input than without that stage. When this occurs, the cycle efficiency actually decreases. Cycle efficiencies as well as differential cycle efficiencies (efficiency improvement per stage) were examined as a function of the number of input and rejection stages for several cycles including: Recuperated Helium Brayton cycle Recuperated 80% N2 20% He (by weight) Brayton cycle Recuperated Supercritical CO2 Brayton with split flow cycle 36 Precooler Reactor RecuperatorPDF Image | Development Of A Supercritical Carbon Dioxide Brayton Cycle
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