摘要
针对一台135MW机组A修后,首次启动转速未能超过1000r/min,启动中出现多个轴承处轴振动很大,多次启动未能达到额定转速的振动问题,通过测试分析,确定了机组振动大的主要原因是:低发对轮晃度严重超标、新转子连成轴系后,转子振型发生变化、高中压过桥汽封动静间隙偏小等多种因素交织在一起,组合效应影响所致。在3号和4号轴承处对轮及低压转子末级叶轮两端4个加重面上实施现场动平衡技术措施以及调整启动方式进行有效磨合后,使机组满负荷运行,整个轴系振动达到优良。
After the major overhaul of a 135MW unit, the first startup speed of the turbine failed to exceed 1 000r/min. Large shaft vibration appeared in multiple bearings when the turbine starting, what cause the turbine repeatedly failed to get the rated speed. According to the testing analysis, the large vibration of the shaft coupling of low pressure-generator, changing of rotor vibration mode and small radial clearance of the ceiling of the cooling steam lead to the large shaft vibration. After the dynamic balancing in the four counterweight surfaces that on the coupling of the 3rd and the 4th bearing, the end of the round of the low pressure stage, the unit is running at full capacity. The entire shaft vibration achieve good value.
出处
《汽轮机技术》
北大核心
2014年第4期295-298,共4页
Turbine Technology
关键词
轴系振动
对轮晃度大
转子振型变化
径向间隙小
动平衡
shaft vibration
vibration of eoupfing
changing of rotor vibration mode
radial clearance
dynamic balancing
