新型双工质吸热器及其塔式光热电站性能研究

In this study, the novel dual heat transfer fluid receiver of thermal conductive oil and nitrate salt as well as the novel heat transfer fluid receiver of supercritical carbon dioxide and chloride salt were proposed to reduce the radiative heat loss. Their optical-thermal coupled performance and the heat-to-power conversion performance applied in solar power tower plants were investigated across different solar times and environmental conditions. The results indicate that both the novel dual heat transfer fluid receivers achieve the most significant thermal efficiency over the original central receivers during the summer solstice, with the increase of 1.41% and 4.17%, respectively. This is attributed to a higher fraction of absorbed energy by the coating and corresponds to the power generation improvements of 1.22% and 6.22%. The performance improvement is positively correlated with the wind speed and inversely correlated with the direct normal irradiance. The proposed novel dual heat transfer fluid receiver can improve the thermal efficiency through the two-level utilization of the non-uniform solar flux, thereby promoting the efficient operation of the solar power tower.