汽轮机调节汽阀阀碟螺栓故障分析与研究  

Analysis and research for the fault of valve cone bolt in steam turbine governor valve

作　　者：金长生[1] 方寅[1] 王军伟[1] 

机构地区：[1]杭州汽轮机股份有限公司,浙江杭州310022

出　　处：《机电工程》2014年第7期888-891,共4页Journal of Mechanical & Electrical Engineering

摘　　要：针对工业汽轮机调节汽阀故障,导致汽轮机停机的问题,对工业汽轮机调节汽阀的结构特点进行了分析研究,对调节汽阀阀碟螺栓断裂和磨损,导致阀碟脱落问题的故障机理及工作环境进行了深入分析研究,提出了减少阀碟螺栓长度、对阀碟螺栓跳档使用及改进阀碟的装配工艺等措施,利用三维软件对其进行建模并利用ANSYS软件对改进前和改进后的阀碟螺栓进行了应力分析。研究结果表明,该方案可以减小阀碟螺栓承受的交变应力,提高阀碟螺栓根部的强度,可以改进因热胀不均而导致螺纹副出现相对位移的情况。结合宁夏石化机组的实际故障案例,通过将该方案应用于该机组中,彻底解决了该机组因阀碟螺栓断裂而导致机组故障问题。Aiming at the problem of industrial steam turbine governor valve fault, leading to the turbine shutdown, the structural characteristics, the industrial steam turbine governor valve were analyzed and researched, the fault mechanism and the working environment were researched of the break and wear of the valve cone bolt, resulting the governor valve malfunction, the measures were presented to decrease the length of the valve cone bolt, increase the diameter of the bolt and improve the assembly technology of the valve, the model was established by the 3D software and the stress was analyzed by ANSYS software of improvement and improved vavle cone bolt. The results indicate that the plan decrease the alternating stress of the valve cone bolt, enhance the strength of the valve cone bolt, and improve the case of the relative displacement for the threads because of the uneven thermal expansion. Then combined with the practical fault case in NingXia petrochemical units and applied to the units, the experimental results show that the plan solves the valve cone bolt falfunction.

关 键 词：汽轮机 调节汽阀 阀碟螺栓 故障分析 

分 类 号：TH131.3[机械工程—机械制造及自动化] TH114