新型350 MW超临界供热机组调试期间故障分析及处理

Fault analysis and treatment during commissioning period of a new 350 MW supercritical heating unit

哈尔滨汽轮机厂有限责任公司350 MW高、中压分缸供热机组采用了新型汽封,提高了缸效率,但也给汽轮机的启动和运行带来一定的问题。针对该机组调试期间出现的机组轴承振动大、低压轴封带水、高压缸轴封端漏汽量大等故障,通过现场排查,采取了增加暖机转速点、优化阀门流量控制、加固振动测量支架、消除汽缸膨胀受阻、转子高速动平衡校正等处理措施后,消除了机组存在的主要故障,保障了改型机组顺利通过168 h满负荷试运行。

The 350 MW heating unit with separated high and medium pressure sub-cylinder which is made by Harbin Steam Turbine Factory Company Limited takes a new steam sealing to improve cylinder efficiency. But it also brings certain problems to the start and operation of the steam turbine. During commissioning period of the unit,there were large bearing vibration,water contained in low-pressure shaft seal,serious steam leakage of high-pressure cylinder at shaft end and other faults. Through the on-site troubleshooting,measures such as increasing the rotation rate set point of units warming,optimizing the valve flow control,reinforcing the vibration measuring bracket,eliminating the cylinder expansion resistance,and correcting the high-speed dynamic balance of rotor were taken. After the treatment,the main faults in the generating units are eliminated,which ensures the 168-hour successful trial of the retrofit unit with full load.