600MW机组凝泵变频改造后振动模态治理研究

某电厂3号机凝结水泵在2008年检修时进行了凝结水泵的变频改造,在改造后的变频调试中,凝结水泵3A在850 r/min到900 r/min这个转速范围内振动明显,严重影响了机组安全生产运行。用ANSYS软件模态分析计算做理论指导,通过加固强化基座桶体刚度来提高桶体的固有频率而避开共振峰转速,以使泵在变频转速范围内能够避开基座筒体的固有频率,从而解决变频运行中振动值过大的问题,达到预期的节能效果。

The Modal Research of Condensation Pump of 600 MW Generating Set After Frequency Conversion Transformation

In an overhaul of the No.3 units in a power plant in 2008,frequency conversion transformation was carried out for the condensation pump.In the subsequent frequency adjustment,remarkable oscillation of the condensation pump emerged in the speed range of 850 r/min~900 r/min,which seriously affected the safe operation of the units.This paper takes the ANSYS modal analysis and calculation as the theoretical guidance.Through increasing the stiffness of the base cylinder body,the natural frequency of the cylinder body rises and a rotate speed causing the resonance peak is correspondingly avoided,so that the pump could keep away from the nature frequency of the base cylinder body in the whole frequency conversion range of rotate speed.In this way,the problem of excessive oscillation during the frequency conversion operation is solved and the expected energy saving effect is achieved.