联合循环中采用抽汽回热的热力分析

Thermodynamic Analysis on Effect of Regenerative Heating of Extraction Steam for Combined Cycle

以多压蒸汽循环、多压再热蒸汽循环为对象，研究了抽汽回热对余热锅炉型联合循环热经济性的影响，分析和计算结果表明：采用抽汽回热可提高联合循环蒸汽系统的总效率，并且存在最佳的凝结水回热温升。研究结果为联合循环发电系统的总体优化设计提供了理论依据。

Using multi pressure level and multi pressure level with reheat steam cycles, this paper analyses how heat economy of combined cycle with HRSG(Heat Recovery Steam Generator) is affected by regenerative heating of extraction steam. The analysis and calculation demonstrate that regenerative heating of extraction steam can improve thermal efficiency of combined cycle steam system and an optimal temperature increase of condensate exists. The results of this paper provide theoretic basis for optimization of combined cycle power generation system during overall design.