1000MW汽轮机中压阀门异常振动分析及治理  

1000MW Steam Turbine Valve Vibration Fault Diagnosis Analysis and Treatment

作　　者：胡剑 卢勇振 马思聪 李卫军 冯立国 刘含伟 HU Jian;LU Yong-zhen;MA Si-cong;LI Wei-jun;FENG Li-guo;LIU Han-wei(Guoneng Ninghai Power Generation Co.,Ltd.,Ningbo 315600,China;E.Energy Technology Co.,Ltd.,Hangzhou 310014,China;State Grid Zhejiang Electric Power Research Institute,Hangzhou 310014,China)

机构地区：[1]国能浙江宁海发电有限公司,宁波315600 [2]杭州意能电力技术有限公司,杭州310014 [3]国网浙江省电力有限公司电力科学研究院,杭州310014

出　　处：《汽轮机技术》2024年第4期289-293,302,共6页Turbine Technology

摘　　要：针对某型超超临界1000MW机组运行过程中出现中压阀门振动过大的异常现象,对中压阀门以及机组轴系振动进行测试及分析,得出中压阀门振动以50Hz分量为主,与机组转频、阀门固有频率比较接近,表明中压阀门存在结构共振现象,且激振源为中压转子。进一步分析表明:中压缸进汽阀门组弹簧支撑刚性不足、中压缸载荷不均,是诱发中压阀门结构共振的主要原因。在检修中,更换新的中压阀门支撑弹簧,并提高其预压紧量,提升其刚度及稳定性;对中压缸缸体进行载荷分配,提升缸体稳定性,从而降低中压转子振动对阀门的影响。处理后,1000MW机组中压阀门振动大幅降低,提高了机组的安全可靠性,具有很好的工程借鉴价值。Aiming at the abnormal phenomenon of excessive vibration of the medium pressure valve during the oper-ation of a certain type of ultra-supercritical 1000MW unit,the vibration of the medium pressure valve and the shaft system of the unit is tested and analyzed.It is concluded that the vibration of the medium pressure valve is mainly 50Hz,which is close to the rotation frequency of the unit and the natural frequency of the valve.It shows that there is structural resonance in the medium pressure valve,and the excitation source is the medium pressure rotor.Further analysis shows that the main reasons for the structural resonance of the medium pressure valve are the insufficient rigidity of the spring support of the medium pressure cylinder inlet valve group and the uneven load of the medium pressure cylinder.In the overhaul,replace the new medium pressure valve support spring,and improve its preload,improve its stiffness and stability;the load distribution of the medium pressure cylinder block is carried out to improve the stability of the cylinder block,so as to reduce the influence of the vibration of the medium pressure rotor on the valve.After treatment,the vibration of the medium pressure valve of the 1000MW unit is greatly reduced,which improves the safety and reliability of the unit and has a good engineering reference value.

关 键 词：1000MW 中压阀门 结构共振 弹簧支架 载荷分配 

分 类 号：TK268.1[动力工程及工程热物理—动力机械及工程]