阿海水电站水轮机振动对机组效率的影响

Effect of Turbine Vibration on Unit Efficiency of Ahai Hydropower Station

针对中、高水头对大中型机组振动的影响,选取阿海水电站水轮机组91、89 m水头带340、240、40 MW负荷工况,分别对机组主轴、下机架导轴承及水导轴承、机组厂房、尾水平台、筒阀接力器振动摆度进行FFT频谱综合分析,探讨不同部位的振动摆度对响应部位及主机的影响,进而从理论上定义水轮机组的健康运行区域,在安全性良好的基础上,测算水耗率,找出现有自然条件下水轮机组不同时段最经济的运行方式,可为调度下达机组运行方式提供依据。

In view of the influence of medium and high water heads on vibration of large and medium-sized units,water turbine of Ahai Hydropower at the operating conditions of 91,89 m head with load of 340,240 and 40 MW was taken as example.The vibration sway of the main shaft,guide bearing of bottom bracket,water guide bearing,powerhouse,draft tube deck,cylinder valve servomotor was carried out spectral synthesis analysis.The impact of vibration sway of different position on the unit and response of part was discussed.The healthy operation area of the water turbine unit was defined theoretically.On the basis of good safety,water consumption rate was calculated to find out the most economic operation mode of water turbine unit in different periods under the existing natural conditions,which can provide basis for operation mode of the unit.