基于S-CO2分流再热式布雷顿循环的塔式太阳能热发电系统研究

Research on Tower Solar Thermal Power Generation System Based on Supercritical Carbon Dioxide Diffluent Flow Reheating Brayton Cycle

随着工业生产和社会经济的迅猛发展,电能的消耗量急速增加,与此同时化石能源却越来越少,塔式太阳能热发电的潜力逐渐显现。建立了以熔融盐为传热介质、超临界CO2分流再热式布雷顿循环为动力循环的塔式太阳能热发电系统模型。深入分析了分流系数及压比、回热度及压差和腔式太阳能集热器的温度对系统循环热效率的影响。结果表明:不同压比存在不同的最优分流系数,使S-CO2循环效率最大;随着回热度的提升,对系统性能的提升效果越来越明显;存在最优集热器温度,使整体太阳能热发电系统效率最大。

With the rapid development of industrial production and social economy,the consumption of electric energy has increased rapidly.At the same time,fossil energy has become less and less,and the potential of tower solar thermal power generation has gradually emerged.In this paper,a tower solar thermal power generation system model with molten salt as heat transfer medium and supercritical CO2 split reheat Brayton cycle as power cycle was established.Then the influence of the split ratio and pressure ratio,reheating ratio and pressure difference and receiver temperature on the Tower Solar Thermal Power Generation System energy efficiency is further analyzed.The results show that there are different optimal split ratios for different pressure ratios,which make the S-CO2 cycle the most efficient;As the recuperating ratio raises up,the improvement of the performance of the entire system is more and more obvious;Existing optimal receiver temperature makes the total Solar Thermal Power Generation System efficiency largest.