中文摘要：

在当前发电机组蒸汽参数不断提高的趋势下,为更准确预测未来超超临界机组热经济性及其主蒸汽参数选择方案,提出了含有九级、十级回热加热器的回热系统设计方案。根据热平衡原理,仿照热力系统设计过程,参考当前1 000MW机组,建立了热力系统计算模型。在此基础上,依据热力学第一定律和第二定律分析热力系统热经济性,采用了图形化的LabVIEW程序开发语言,对上述热力系统计算模型进行计算,得到了更为具体的蒸汽参数对机组热经济性的影响变化关系,预测了未来机组可能选择的蒸汽参数,并对比了几种不同的回热系统设计方案的热经济性,得出未来机组在25～35MPa,600～680℃蒸汽参数范围内应该采用九热级数的结论。

英文摘要：

As the tendency of the increasing steam parameters of power generation units,heat recovery system of regenerative heater with nine or ten stages was proposed to predict the thermal economic performance and main steam parameters options in next generation ultra-supercritical unit more accurately.the thermodynamic system model is established on the principle of thermal balance based on the current 1000MW units.According to the first law and second law of thermodynamics analysis,thermal economic performance of this system is conducted and calculated using the LabVIEW,a graphical programming language.A more specific relationship of steam parameters between the thermodynamic economic performances was obtained.The steam parameters of next generation units were forecasted and thermal economy of several different regenerative system was compared.When the steam parameters work at the range of 25~35MPa and 600~680 ℃,the nine thermal stages are recommended.