350MW汽轮发电机组的振动分析及处理

华能大连电厂一台350MW机组自投运以来按照合同规定存在一些振动问题,具体表现在3个方面：冷态启机定速和带低负荷时4号轴振动偏高;励磁机7号、6号轴承降速过程监界转速振动过大;满负荷状态1号轴振动略偏高。这台机组的合同对振动的要求很高。上述问题在国内同功率等级的类似机组上具有普遍性。经过对该机组的多次详细测试和分析,确定了问题的原因,并按计划分步实施了处理措施,取得了良好的效果。给出了主要测试数据、故障征兆,分析过程和依据以及具体的处理方法。

Vibration Analysis and Diagnostic for a 350MW Unit of HPI Dalian

According to the contract, a unit of HPI Dalian power plant exists some vibration problems from its beginning operating. These problems are shown in the following three aspects: firstly, bearing #4 vibration levels are slightly high at 3000rpm while unit is with low load or at cold start; secondly, the critical speed vibration levels of bearing #7 and #6 are high during coast down; thirdly, vibration levels of bearing #1are slightly high at full load. The vibration limits of this unit in the contract are required so little. Fault causes are obtained after detailed testing and analysis. After dealing with these faults, good results are gotten. This paper gives the main test data, fault premonition, analysis procession, and the detailed handling methods, which can be as reference to dealing with the vibration problem of large units in our country.