1000 MW汽轮机组高频声振故障诊断及治理  

Diagnosis and Treatment of High Frequency Vibro-acoustic Faults in a 1 000 MW Steam Turbine Unit

作　　者：李卫军 何玉灵[2] 李国明 应光耀 顾正皓 王崇如 LI Weijun;HE Yuling;LI Guoming;YING Guangyao;Gu Zhenghao;WANG Chongru(State Grid Zhejiang Electric Power Institute Co.,Ltd.,Hangzhou 310014,China;Hebei Key Labrotaroty of Electric Machinery Maintenance and Failure Prevention,Department of Mechanical Engineering,North China Electric Power University,Baoding 071003,Hebei,China;Guoneng Zhejiang Beilun No.1 Power Generation Co.,Ltd.,Ningbo 315000,Zhejiang,China)

机构地区：[1]国网浙江省电力有限公司电力科学研究院,杭州310014 [2]华北电力大学机械工程系暨河北省电力机械装备健康维护与失效预防重点实验室,河北保定071003 [3]国能浙江北仑第一发电有限公司,浙江宁波315000

出　　处：《噪声与振动控制》2023年第1期141-147,202,共8页Noise and Vibration Control

摘　　要：针对某型超超临界1000MW机组在运行过程中出现的噪声大、瓦振大的声振故障进行诊断和治理。首先在分析机组高频振动的基础上对机组的振动和噪声进行测试分析,发现振动变化量以高频分量为主,并伴随高频的机械噪声,通过对进汽阀组的封装式弹簧支座振动进行进一步测试,发现进汽阀门弹簧支座的共振频率和振动、噪声的主频分量频率接近,得出故障为汽流失稳或摩擦所诱发的自激振荡,并诱发强烈机械噪声所致;然后对几例该型故障的共振频率进行分析,发现当封装式弹簧支座的固有频率下降至310Hz时,弹簧存在劣化甚至断裂的风险,在运行和检修中应予特别注意;最后,给出对1000MW机组封装式弹簧组的评估及故障治理方法及流程图。Identification and control of the vibro-acoustic fault of high noise and large bearing vibration in an ultrasupercritical 1 000 MW turbine generator unit during operation are investigated. According to the test and analysis of the vibration and noise of the unit, it is found that the vibration mainly consists of high-frequency components accompanied with high-frequency mechanical noise. Further tests show that the natural frequency of the encapsulated spring support of the steam inlet valve group is close to the frequency of the main vibration and noise components. It indicates that the vibroacoustic fault is a self-excited oscillation induced by the unstable steam impact and friction, which also induce the mechanical noise at the same time. The further resonance frequency analysis of the typical cases shows that as the natural frequency of the encapsulated spring support drops to 310 Hz, the spring support will subject to the risk of deterioration and even fracture. Such a conclusion should be specially noticed during overhaul and maintenance. Finally, the assessment and the treatment approaches as well as the flow chart for the aforementioned vibration fault of the encapsulated spring group in the 1 000 MW turbine units are proposed.

关 键 词：故障诊断 汽轮机 切向进汽 振动 机械噪声 弹簧支座 

分 类 号：TM311[电气工程—电机]