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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors

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Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors ( advanced-nuclear-power-technology-program-supercritical-carb )

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A in Figure 13.16). The second is to put it at the reactor inlet and merge it at the high temperature recuperator inlet (valve B in Figure 13.16). In both cases the performance is the same in the current analysis, since the location affects only the transient and not the final part-load steady state, which was evaluated. From the plant design point of view it is easier to locate the bypass at the reactor inlet, since it will better fit inside the PCU, but this option is more challenging from the material viewpoint. PRECOOLER C COMPRESSORS FLOW MERGE A LOW TEMPERATURE HIGH RECUPERATOR TEMPERATURE RECUPERATOR Figure 13.16 Possible location of bypass and throttling valves In the case of bypass control the turbine operates away from its design point and its efficiency and pressure ratio are affected. Locating the throttling valve on the compressor inlet to maintain the compressor inlet pressure (valves C and D in Figure 13.16) would be a typical option for an ideal gas cycle, however in the case of the recompression cycle this would not work. The reason is that the cycle has two compressors operating in parallel and their flow split must be kept constant in order to provide the required pressure ratio. The flow split is a function of the high and low pressures. The effect of the real gas properties is different at different pressures and therefore there are different requirements for recompression. In order to keep the flow split constant it is necessary to introduce a throttling valve on the high temperature recuperator inlet and adjust the pressure to the original value (valve E in Figure 13.16). This ensures that the flow split is almost constant and the bypass control scheme is D FLOW SPLIT TURBINE GENERATOR B E 289 REACTOR

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