蔡文方,匡萃杰,乔红宝,钱林锋,蒲泽敏,李卫军
CAI Wenfang,KUANG Cuijie,QIAO Hongbao,QING Linfeng,PU Zemin,LI Weijun

• 1:国网浙江省电力有限公司电力科学研究院
• 2:杭州意能电力技术有限公司
• 3:新疆生产兵团红星发电有限公司

摘要(Abstract)：

介绍一台供热背压机组振动快速爬升致使机组跳机的故障过程，现场根据振动及偏心数据分析判断机组发生了严重动静碰磨，且转子塑性弯曲。揭缸后发现转子前汽封、叶顶及持环动静碰磨严重，转子返厂测得最大弯曲量达240μm。事故分析表明故障主要原因是：转子基建安装不够精细为故障埋下隐患；冷态启动过程中缸体膨胀不均，导致动静碰磨引发转子弯曲；停机过程中轴封回汽漏至缸内冷凝成积水，进一步导致转子塑性变形。在转子返厂处理后，现场通过更换汽封齿、调整动静部件间隙、优化机组启动曲线等措施，有效控制了动静碰磨故障，机组顺利完成试运行。
The fault process of unit tripping caused by vibration surging of a back pressure unit for heating is introduced. On-site analysis of vibration and eccentricity data showed that there occurred severe collision between rotary and static parts,and the rotor was plastically bended. After uncovering the cylinder,it was found that there were severe collisions between the rotary and static parts of the front steam seal,blade tip and holding ring,and the maximum bending capacity of the rotor was up to 240 μm. Accident analysis shows that the major reasons are :1)The rough installation process of the rotor was the hidden danger of the fault;2)The uneven expansion of cylinder body that caused rotary and static collision during cold start-up and resulted in rotor bending;3)The leakage steam of shaft seal returned to the cylinder and condensed into accumulated water,which further caused plasticity deformation of the rotor. After return-to-factory maintenance,the collision between rotary and static parts was effectively handled by replacing the steam seal teeth,adjusting the gap between rotary and static components and optimizing the unit start-up curve.

关键词(KeyWords)： 动静碰磨;转子弯曲;背压;膨胀;积水
rotary and static collision;rotor bending;back pressure;expansion;water accumulation

Abstract:

Keywords:

基金项目(Foundation):

作者(Author): 蔡文方,匡萃杰,乔红宝,钱林锋,蒲泽敏,李卫军
CAI Wenfang,KUANG Cuijie,QIAO Hongbao,QING Linfeng,PU Zemin,LI Weijun

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