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11 Control Scheme Design for the Recompression Cycle So far only steady state analyses have been carried out. The behavior of the cycle in off-design point operation is not known. Understanding this behavior is a crucial step in selecting the cycle control scheme. Since real CO2 properties and thus operating conditions strongly affect the cycle efficiency the control schemes currently used for Brayton cycles operating with perfect gases might not be readily applicable. Therefore, it is necessary to perform analyses that, for a given plant design, evaluate the cycle efficiency as a function of power level. This will help understand the effect and importance of each of these parameters on the cycle efficiency. The goal of this effort is to identify the best-suited control scheme. Control schemes for closed gas turbine cycles have been described before, however all of the studies [Kumar et al., 2002], [Xinglong, 1990] looked at application of these control schemes to the helium Brayton cycle. In the case of the supercritical CO2 cycle the situation is slightly different, because the working fluid is not an ideal gas, therefore some conclusions regarding helium Brayton cycle control will not apply here. In addition the cycle layout is different, since helium Brayton cycles are simple or inter-cooled Brayton cycles, whereas the preferred S-CO2 cycle uses the recompression cycle layout. The chapter is organized in the following manner. First, the possible control schemes and their performance on helium Brayton cycles will be described. Second, these control schemes will be tested for the S-CO2 cycle with the objective of identifying the control scheme that achieves the highest efficiency over the range of nominal operating power. 11.1 Control Scheme Description The intent of this section is to describe the available control schemes for the supercritical CO2 Brayton cycle. Mainly the power control will be discussed as it is of main importance for the successful implementation of the cycle. Other control functions such as plant protection in accident situations will be investigated in the future once the 239PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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