摘要
该文基于循环复合的概念 ,针对末级加热器疏水排入凝汽器造成的附加冷源损失的情况 ,修改了传统回热作功与回热作功比的定义 ,从而保证了回热作功比与再热机组热效率之间确定的对应关系 ;文中区别再热与非再热机组不同的蒸汽动力循环特征 ,分别提出了新的回热作功比和汽机内效率的计算模型 ,使回热作功比成为独立衡量热力系统回热效果的一个新的指标 ;热力系统中 ,抽汽压降、加热器的端差以及疏水温度的变大 ,均造成抽汽热量不能充分用于本级给水的加热 ,降低了回热效果 ,这种影响可以用回热作功比的变化来描述 ,算例表明新模型可以用于再热机组热力系统节能改造的方案论证 ,而回热作功比亦可用来定量评价热力系统的改造效果。
Basing on the cycle combined concept and considering addition energy lose caused by the last heater's drain water to the condenser,the concepts of classical regeneration work and rate of regeneration work are modified.The new concepts assure the corresponding relation between the rate of regeneration and turbine's efficiency.Based on the different steam power cycle features of reheater's and unreheater's turbine system,the new calculating models for the rate of regeneration work and turbine's efficiency are introduced.By the new model,the rate of regeneration work become the new index of reheater turbine's system regeneration performance.The regeneration performance may effected by the parameters of extraction steam or exit water temperature or drain water temperature and the effect can be calculated by the rate of regeneration work.The calculating samples in the paper show that the new models may be used to evaluate the plan of reheater's turbines system reformation and the rate of regeneration work can be used to evaluate the reforming effect quantitatively.
出处
《中国电机工程学报》
EI
CSCD
北大核心
2002年第3期68-71,共4页
Proceedings of the CSEE
基金
东南大学自然科学基金资助项目 (XJ0 0 0 3 0 6)
关键词
再热机组
热力循环
评价
算法
汽轮机
rate of regeneration work
economical performance
steam circulation
