某联合循环机组汽轮机高负荷低频振动分析及处理

Analysis and Treatment of High Load Low-Frequency Vibration on Gas-Steam Combined Cycle Turbine

阐述了某发电厂一台新投产联合循环机组汽轮机高负荷低频振动发生的过程和特征,诊断出机组出现高负荷低频振动的类型是汽流激振,而造成异常振动的原因为热态工况下动静间隙不均匀。通过运行中摩合及采用其他参数控制、临修调整动静间隙等一系列措施,最终使机组顺利带满负荷。通过分析机组异常振动的方法和采取消除振动故障的工程措施,对后续类似机组的汽流激振故障处理和预防具有一定的借鉴意义。

This paper describes the process and characteristics of the occurrence of high load low-frequency vibration in a combined cycle unit turbine.It is diagnosed that the type of high load low-frequency vibration in the unit is steam excitation,and analyzed that it is caused by non-uniform dynamic and static gap under hot state.Some measures are taken,such as friction in operation and other parameter control,dynamic and static gap adjustments,to the unit which was finally able to smoothly carry full load.This paper summarizes the vibration characteristics of steam excitation in combined cycle steam turbines,which shed light on the treatment and prevention of steam excitation in similar units in the future.