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11.1.4 Control Strategy Description – Conclusions The control scheme usually consists of a combination of the control schemes described in the preceding paragraphs. Bypass control is used for rapid changes in power demand; inventory control is used for the slower transients, while preserving cycle efficiency. The order of control schemes on the time scale from the fast acting to the slow acting is bypass control, inventory control and, last, temperature (reactor) control. Figure 11.4 shows the cycle efficiency as a function of fraction of rated power for different control schemes. This figure is for an ideal gas Brayton cycle and is therefore not entirely relevant for cycles that use real gases such as CO2. 11.2 Control Schemes for the Supercritical CO2 Recompression Cycle So far only a steady state model has been developed for the S-CO2 recompression cycle. This steady state model will be used to model the steady state operation in off- design point modes. This will be accomplished by calculating the steady state cycle efficiency at the parameters which correspond to the off-design operating condition of interest. 11.2.1 Bypass Control In the case of bypass control part of the flow bypasses the turbine. It is important to carefully select the location of the bypass. The best strategy is to insert bypass into the system such that the effect on the cycle operating temperatures will be minimal. Based on this consideration only two possible locations of the bypass are available for the recompressing cycle (see Figure 11.5). The first is to put the bypass after the recompressing compressor and merge it at the high temperature recuperator outlet (valve A in Figure 11.5). The second is to put it at the reactor inlet and merge it at the high temperature recuperator inlet (valve B in Figure 11.5). In both cases the performance will be the same in the current analysis, since the location will affect only the transient and not the final part--load steady state, which will be evaluated. From the plant design 247PDF Image | Advanced Nuclear Power Technology Program A Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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