Thermodynamic Analysis of Heat Absorption Temperature Difference of Supercritical CO<sub>2 </sub>Recompression Cycle
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ObjectivesTo reduce the amount of molten salt in molten salt thermal energy storage tower-type solar thermal power generation systems, it is necessary to increase the heat absorption temperature difference of supercritical CO2, thereby enhancing the heat absorption and release temperature difference of the molten salt, therefore, modeling and analysis are carried out for the endothermic temperature difference of supercritical CO2.MethodsA supercritical CO2 recompression cycle model is established in EBSILON, and combined with theoretical derivation to analyze the heat absorption temperature difference of the main heater (ΔT1) and the reheater (ΔT2). A combination of theoretical analysis and simulation is employed to investigate in detail the effects of parameters such as the maximum cycle temperature, minimum cycle temperature, total cycle pressure ratio, high-pressure turbine pressure ratio, and shunt coefficient on the heat absorption temperature difference of supercritical CO2.ResultsIncreasing the maximum cycle temperature, and decreasing the minimum cycle temperature, total cycle pressure ratio, high-pressure turbine pressure ratio, and shunt coefficient can increase the main heater heat absorption temperature difference ΔT1. Increasing the maximum cycle temperature, total cycle pressure ratio, and high-pressure turbine pressure ratio can increase the reheater heat absorption temperature difference ΔT2. When the maximum cycle temperature increases, both ΔT1 and ΔT2 increase. Data show that when the maximum cycle temperature rises from 400 ℃ to 700 ℃, ΔT1 increases from 122.13 ℃ to 182.81 ℃, and ΔT2 increases from 54.47 ℃ to 67.23 ℃.ConclusionsBy adjusting cycle parameters, the heat absorption temperature difference of the supercritical CO2 recompression cycle can be effectively improved, thereby optimizing system performance. The results provide a theoretical basis for further optimization of the supercritical CO2 recompression cycle.
