近几年来，一些新型汽封相继应用于汽轮机通流改造，不同形式的新型汽封热经济性和已进行新型汽封改造的机组运行状况值得研究。结合湖南省2010年10台机组的汽封改造成果，分析和总结不同形式汽封在改造后开机过程中的安全性、改造前后热经济性以及运行的时效性，并提出改进建议。所提出的建议对发电厂进行类似改造有一定参考价值。

In recent years, some new type steam seal have been used in retrofitting of flow passage of stream turbine. It is worthy of studying the heat economy of various steam seal and operation status of retrofitted units. According to steam seal retrofitting results of ten units in Hunan province in 2010, the safety of different steam seal during start up, heat economy before and after transformation and timeliness are analyzed and summarized. The recommendations are valuable to similar transformation of the power plants.