超临界二氧化碳再压间冷分流光热发电系统性能仿真分析

Simulation analysis on performance of supercritical carbon dioxide recompression intercooling split-flow solar power system

为提高基于光热的超临界二氧化碳(S-CO2)循环发电效率,提出了1种改进的再压间冷分流循环发电方案。通过建立热力学模型对系统进行参数优化,在循环效率最大和熔融盐出口温度为290℃2种情况下,将该方案与传统再压缩循环方案进行了效率和系统总热导对比。计算结果表明:相较于再压缩循环方案,改进方案的效率提高了1%,总热导增加了4%;降低熔融盐出口温度可以减小系统总热导;当熔融盐出口温度限定为290℃时,再压间冷分流方案的效率降低至36%,系统总热导降低了10%。该结果可为塔式光热发电系统的设计和参数选择提供参考。

In order to enhance the power generation efficiency of supercritical carbon dioxide(S-CO2)cycle based on solar power,an improved recompression intercooling split-flow cycle power generation scheme is proposed.The system parameters were optimized by establishing a thermodynamic model,and the efficiency and total thermal conductance of the system were compared with that of the recompression cycle under two conditions:the maximum cycle efficiency and the outlet temperature of molten salt is 290℃.The calculation results show that,the efficiency of the improved scheme is 1%higher than that of the recompression scheme,and the total thermal conductance of the improved scheme is 4%higher than that of the recompression cycle.When the outlet temperature of the molten salt is limited to 290℃,the efficiency of the recompression intercooling split-flow cycle decreases to 36%,and the total thermal conductance of the system decreases by 10%.The research results provide a reference for design and parameter selection of tower solar power systems.