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heat exchanger into two serial units (the added recuperator is called a medium temperature recuperator or MTR) and adding an additional compressor. This arrangement is called a “double recompression” cycle in this report. If efficiency benefits for this arrangement are demonstrated, then more recompression loops could potentially be added resulting in “multiple recompression” cycles. Figure 4 shows the performance of a double recompression cycle. Even though the temperature difference at the top of all recuperators has decreased to about 30 oC (compared to about 40 oC for the recompression cycle in Figure 2), the resulting cycle efficiency has actually decreased compared to that of the reference case. Two possible reasons can be identified to explain the reduction in the cycle efficiency. First, the benefits of the increased recuperator performance are offset by the compression of even hotter CO2 in the second recompressing compressor. Second, as can be seen from Figure 2 and Figure 4, the CO2 temperature at the Na-to-CO2 HX inlet (HTR cold side outlet) is already close to the Na outlet temperature even at the reference conditions. Since the CO2 temperature cannot exceed the Na temperature, any possible improvement in recuperator performance is limited by the sodium temperature. This is another specific feature of the S-CO2 cycle for a SFR. When applied to other types of reactors which have higher reactor side temperatures (e.g., the High Temperature Gas-Cooled Reactor), the benefits of the double-recompression cycle configuration considered here could be more significant, if the recuperator performance is not limited by the heat addition temperatures. On the other hand, even for SFR temperatures, the fact that the cycle performance is limited not only by the turbine inlet temperature but also by the low end of the heat addition temperature range, may present an opportunity to improve the whole plant performance by optimizing the reactor side lower temperature. As noted above, though, optimization of the reactor system temperatures is beyond the scope of the current work. Based on the results obtained here, it is believed that the benefits from such an optimization would be more significant for the double recompression cycle compared to the single recompression cycle. 16PDF Image | Performance Improvement Options for the Supercritical Carbon Dioxide Brayton Cycle
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