汽轮机通流改造效果分析、存在问题研究及对策

Analysis and Research on Steam Turbine Flow Remoulding for Energy Conservation and Countermeasures

对现役机组进行通流改造是提高机组运行经济性的重要途径,不仅可以提高效率、增加出力,同时可以大大节省基建投资。但通流改造存在的一些问题也不容忽视,如机组通流能力偏大、低负荷下的经济性较差、主蒸汽压力、温度及最终给水温度达不到设计值、高中压合缸处轴封漏汽量偏大、轴封系统改造后高压缸效率提高不明显等,就这些问题进行分析、研究,并给出对应的解决方案。

Flow remoulding is the important method for economical efficiency improvement on commissioned steam turbines. It can not only increase the efficiency and load, but also cut down the construction investment. However, there are also problems brought about by the remoulding which should not be ignored, such as steam turbine flow capacity enlargement, economical efficiency reduction in part loads, initial steam pressure, temperature and feedwater temperature deviation from the designed values, sealing steam leakage enlargement at the joint of HP and MP cylinders, and unconspicuous HP cylinder effieieney improvement. In this paper, the analysis and study on these problems in steam turbine flow remoulding are conducted and the corresponding solutions are put forward.