冷凝机组供热改造中汽轮机内效率的提高

纯冷凝机组进行热电联产改造时对大焓降缩放喷嘴进行改型设计，可减少因调节级后压力升高而产生的激波损失，但这种改造方法不能完全消除激波现象。针对汽机低真空供暖及打孔抽汽改造，本文分析提出不同的改造的方案，不但可以完全消除激波，且能保证汽机大部分压力级仍在原设计的参数附近运行，提高汽机总内效率，使热电联产改造获得最佳经济效益。

Raise Internal Rate for a Condensing Turbine Transformed to Heating Turbine

It will low the shock wave loss to change governing stage nozzles's model as a condensing turbine transformed into heating turbine.But we can't remove shock wave loss completely by this way.This article puts forward two ways in accordance with low vacuum heating and draw steam heating.It not only removes shock wave loss completely but also keeps each pressure stage run near the original parameter.It will raise general rate of the turbine,make thermal and power plant chalk up the best economic yield.