【摘要】 可再生能源的迅速普及给电网的稳定性和可靠性带来了挑战，为了解决此问题，燃煤机组承担了调峰调频的主要任务。汽轮机高位布置技术可大幅减少耐高温材料的用量，从而提高超高参数机组的经济性。为获得汽轮机高位布置超超临界燃煤发电机组的变负荷性能，建立了(火用)分析和(火用)经济性分析模型，分析了不同负荷下机组的(火用)经济性，获得了机组变负荷的不可逆性分布。分析结果表明：通过对系统参数进行优化，可以改善高压加热器的(火用)效率；采用汽轮机高位布置技术的燃煤机组的度电成本为0.332 4元/(kW·h)；发电的(火用)价格随着负荷的升高而降低。更多还原

【Abstract】 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 ultrasupercritical 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.更多还原