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The simpler recompression cycle is more significantly affected if the turbine inlet pressure is reduced, therefore its performance at part load operation will have to be established and a suitable control scheme developed. This task is performed in Chapter 11. Figure 5.5 also shows that for turbine inlet pressures of about 20 MPa and more the recompression cycle performance is better than that of the partial cooling cycle with improved regeneration. Since 20 MPa is a manageable pressure at 550oC turbine inlet temperature it was decided to adopt the recompression cycle for the further investigation of supercritical CO2 as a working fluid, due to its simplicity and high efficiency. 5.7 Summary This chapter described and compared the potential of several cycle layouts that are available for further improving the efficiency of the Brayton cycle operating with supercritical CO2. The chapter surveyed the pre-compression cycle, partial cooling cycle, partial cooling cycle with improved regeneration and the recompression cycle. The pre-compression cycle improves the efficiency by using a different pressure level on the hot sides of the high and low temperature recuperator, which equalizes the heat capacity of the streams in the low temperature recuperator and solves the pinch-point problem. More heat is available for regeneration and the cycle efficiency is improved. The partial cooling cycle improves the cycle efficiency by recompressing a fraction of the flow to the inlet of the high temperature recuperator, thus equalizing the flow weighted heat capacities in the low temperature recuperator (and third recuperator if employed). The efficiency improvement of the partial cooling cycle is larger than for the pre-compression cycle. In the case of the partial cooling cycle with improved regeneration the achievable efficiency at turbine inlet pressures below ~ 20 MPa is the highest among the surveyed cycles. Another benefit is that the cycle efficiency is almost independent of the turbine inlet pressure. This feature is very useful if pressure control is applied to the cycle. 112PDF Image | Supercritical Carbon Dioxide Cycle for Next Generation Nuclear Reactors
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