Thermodynamic Process Splitting Analysis and Parameter Optimization of Supercritical CO2 Cycles with Virous Configurations
The efficiency of novel supercritical CO2(S-CO2)cycles can be improved by process modifi-cation,making the configuration layout complex and diverse.To clearly explain the mechanism of process modification measures for the improvement of cycle efficiency,in this paper,five complex modified S-CO2 cycles,including pre-compression,post-compression,recompression,intercooling and reheat,are split into several heat-to-power conversion processes.Then,the correlation equations between the split processes and cycle efficiency are established to optimize the processes and parameters.Results show that the pre-compression,post-compression and recompression schemes increase the power con-sumption of compression and reduce the heat input for the cycle efficiency improvement.The recompres-sion scheme features the best performance and the cycle efficiency is increased by 5.1%points after opti-mizing the flow rate of recompressed stream.Moreover,adoption of the partial intercooling scheme can ef-fectively reduce the power consumption of compression and meanwhile avoid high-level heat degrading,and the cycle efficiency is increased by 2.2%points after the optimization of intercooling pressure.In addition,the reheat scheme increases the output power of turbine without changing the power consump-tion of compression and the efficiency of cycle is increased by 1.9%points after optimizing the reheat pressure.Finally,the combination of recompression,intercooling and reheat increases the cycle efficien-cy by 9.3%points.
supercritical CO2 cycleprocess modificationthermodynamic optimizationprocess splitting analysisequivalent heat-to-power conversion
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