铅基堆超临界CO2复合循环发电系统热力学分析

本文对比了再压缩超临界CO2 (S-CO2)循环、蒸汽朗肯循环、He布雷顿循环分别应用于铅基堆的最优热学性能,明确了S-CO2循环与铅基堆结合较传统循环的热力学优势。为进一步提高再压缩S-CO2循环的效率,以跨临界CO2 (T-CO2)循环为底循环构建了再压缩S-CO2/T-CO2复合循环,探讨了不同顶循环透平入口温度、压力和压缩机入口温度条件下系统性能的变化规律,对比了S-CO2/T-CO2复合循环和S-CO2循环的热学性能。结果表明:铅基堆再压缩S-CO2循环发电系统较传统循环形式具有更高的热效率;构建的S-CO2/T-CO2复合循环能够有效提高S-CO2循环的效率,在所研究参数范围内,S-CO2/T-CO2复合循环的热效率和效率比S-CO2循环分别最大可提高约4.8%和8.3%;再压缩S-CO2循环和S-CO2/T-CO2复合循环热学性能随顶循环关键参数变化规律具有一致性。

Thermodynamic Analysis of Combined Supercritical Carbon Dioxide Brayton Cycle Applied to Lead-cooled Fast Reactor

In this paper,the thermodynamic analysis of the lead-cooled fast reactor composing recompression supercritical carbon dioxide(S-CO2) Bray ton cycle,steam Rankine cycle and He Bray ton cycle as power block is introduced.The advantage of lead-cooled fast reactor composing recompression S-CO2 Brayton cycle is explored through comparing the optimal thermodynamic performance of recompression S-CO2 Brayton cycle with that of conventional power cycles.In order to improve the performance of S-CO2 cycle,the recompression supercritical carbon dioxide/transcritical carbon dioxide(S-CO2/T-CO2) combined cycle is primarily constructed by using T-CO2 as bottom cycle.The influences of the turbine inlet temperature,turbine inlet pressure and the compressor inlet temperature of the top cycle on the combined-cycle performance are further invesitgated.Finally,the performance of the S-CO2 cycle and that of S-CO2/T-CO2 combined cycle are compared.The results are indicated as follows.First,the lead-cooled fast reactor comprising recompression S-CO2 Brayton cycle has higher efficiency than the conventional systems.Second,the thermal efficiency and exergy efficiency of the S-CO2/T-CO2 combined-cycle can be maximally improved by 4.8% and8.3% comparing to that of S-CO2 cycle,separately.Third,the thermal performance of the S-CO2 recompression cycle and that of S-CO2/T-CO2 combined cycle alter consistently with the changed crucial parameters of the top cycle.