600MW发电机单油环密封油系统故障原因分析与改进

Fault Analysis and Improvement of 600 MW Generator Single Oil Ring Seal Oil System

600 MW发电机密封油系统实际运行中存在密封油真空油箱真空低无法维持规定真空运行、发电机氢气纯度下降快、密封油管路系统及密封油泵振动大、密封油浮子油箱油位波动大浮球阀易卡涩的缺陷,造成发电机频繁补氢维持发电机氢气纯度以及发电机氢气大量泄漏着火的事故。本文通过查找图纸、说明书及现场的变工况运行试验,从设计及制造方面认真分析引起密封油系统问题的主要原因,找出了600 MW发电机单油环密封油系统故障的解决方案,方案实施后密封油系统运行稳定可靠,消除了600 MW发电机密封油系统实际运行中的问题,提高了机组经济安全运行水平。

In the actual operation of the sealing oil system of 600 MW generator,there were some defects,such as low vacuum of the sealing oil vacuum tank,inability to maintain the specified vacuum operation,rapid decline in the hydrogen purity of the generator,large vibration of the sealing oil pipeline system and the sealing oil pump,large fluctuation of the oil level of the sealing oil float tank,easily sticking of the floating ball valve.The accident was by frequent hydrogen replenishment to maintain the purity of the generator hydrogen and a large amount of the generator hydrogen leakage and fire.Though drawings,specifications and field operation tests under variable operating conditions,the main causes of the sealing oil system problems are carefully analyzed from the aspects of design and manufacturing,and the solution to the failure of the 600 MW generator single oil ring sealing oil system was found.After the implementation of the solution,the sealing oil system runs stably and reliably.The problems in the actual operation of the 600 MW generator sealing oil system are fundamentally eliminated,and the safe and economic operation level of the unit is improved.