汽轮机轴封结焦碰磨故障分析与控制  

Fault Analysis and Control of Coking and Rubbing in Steam Turbine Shaft Seals

作　　者：韩风梅 戴风涛 HAN Feng-mei;DAI Feng-tao(Research Institute of Dushanzi Petrochemical Company,CNPC,Dushanzi 833699,China)

机构地区：[1]中国石油独山子石化分公司研究院,新疆独山子833699

出　　处：《石油化工设备》2024年第6期80-84,共5页Petro-Chemical Equipment

摘　　要：通过对某石化公司汽轮机振动异常波动进行监测分析,利用振动频谱图、轴心轨迹及轴心位置图,结合机组相关参数趋势变化,进行故障特征识别及故障机理分析。分析认为,汽轮机振动异常波动系轴封处泄漏的润滑油气在高温下结焦并附着在油封位置,结焦层达到一定厚度时突出部位与转子轴外径发生碰磨所致。采取调整氮封压力、提高轴封冷却风量及加设隔板等措施缓解了汽轮机振动波动,提出了汽轮机停机时的预防性维护措施,以避免设备故障的发生。By monitoring and analyzing the abnormal vibration fluctuations of a certain petrochemical company's steam turbine,using vibration spectrum diagrams,axis trajectory and axis position diagrams,in association with the trend changes of relevant parameters of the unit,fault feature identification and fault mechanism analysis were conducted.The analysis indicates that the anomalous vibration of the steam turbine is attributable to the leakage of lubricating oil and gas at the shaft seal,which gives rise to the formation of coke at elevated temperatures and adherence to the oil seal position.Once a certain thickness of coke has accumulated,the protruding portion collides and rubs against the diameter of the rotor shaft.To mitigate the vibration experienced by the turbine,a series of measures were implemented,including adjustments to the nitrogen seal pressure,an increase in the cooling air volume for the shaft seal,and the addition of baffles.During the turbine shutdown,a set of preventive maintenance procedures were put forth to prevent potential equipment failure.

关 键 词：汽轮机 振动 轴封 结焦 碰磨 控制 

分 类 号：TQ051.2[化学工程]