汽轮机高位布置超超临界燃煤发电系统变工况㶲经济性分析

The rapid penetration of intermittent renewable power puts pressure on the stability and reliability of power grids. To address this tissue, coal-fired power plants play an increasingly important role in providing the peak shaving service. Moreover, the high-level layout of turbine can significantly reduce the amount of high temperature resistant materials and thus improve the economics of ultra-supercritical coal-fired power plants. The exergy and exergy economic models were developed to obtain the performance of ultra-supercritical coal-fired power plants with high-level layout of turbine under load-cycling operation conditions. By analyzing the exergy economic of coal-fired power plants under different loads, and the distribution of irreversibilities was obtained. The results show that the exergy efficiency of the high pressure turbine can be improved by optimizing the parameters. Moreover, the cost of electricity per unit with the high-level layout is 0.332 4 yuan/(kW.h). The exergy price of electricity generation decreases with the increase of load.