Abstract
Semi-closed S-CO2 cycle (SC) has attracted much attention for its compactness and high power generation efficiency. For the purpose of deepening the understanding of the cycle and clarifying its construction process, this paper proposes a constituent split method suitable for the analysis of SC. This method can equivalently split the SC into two parts based on the constituent of the working fluid, and one part is an open cycle of fuel and oxidant, and the other part is a closed S-CO2 cycle. The method is described based on single-compression semi-closed S-CO2 cycle (SSC) and recompression semi-closed S-CO2 cycle (RSC), respectively. The principle of split method is explained through the analysis of the cycle process, and it is found that the two sub-cycles after splitting not only have independent processes, but there are also thermal integration connections in the combustor and the regenerators, respectively. In addition, the effect of split method is expressed through the calculation model of each equipment and the equations derivation of the cycle efficiency. The constituent split method is evaluated by the analysis of three performance results: the sensitivity of main vapor temperature and pressure to cycle performance, the improvement of thermal efficiency from 59.9% for SSC to 66.1% for RSC, and the change of mass flow of working fluid from SSC to RSC. It is found that the above performance changes can be directly and visually explained by the proposed method, which proves the applicability and superiority of constituent split method for SC.
Published Version
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