核电汽轮机低压转子摩擦振动试验研究.pdf

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1、第５９卷第４期汽轮机技术Vol.５９No.４２０17年８月TURBINETECHNOLOGYAug.２０17核电汽轮机低压转子摩擦振动试验研究周鹏，杨璋（福建宁德核电有限公司，宁德3５５２００）摘要：试验研究核电汽轮机低压转子与端部汽封体发生动静摩擦时的振动特征、产生机理与处理方法。某核电汽轮机调试期间，发现低压转子的各振动测点振幅持续异常缓慢爬升。通过振动频谱、振幅趋势、机组运行工况及低压缸结构特点等诊断认为受第二台循环水泵启动的影响，低压缸缸体发生下凹变形导致低压转子与端部汽封体发生了轻微动静摩擦，采取“磨合”运行的方

2、式处理，约５h后振动缓慢下降并恢复正常。解体检查发现端部汽封体下半部分的齿尖与轴颈处存在明显磨损痕迹。机组启动过程中，当凝汽器抽真空后实测汽封体下沉变形量约1mm，容易诱发汽封体与轴颈发生动静摩擦。对低压转子实施反相动平衡加重提高平衡精度后，振动基数大幅降低，避免了该类动静摩擦；研究还发现同比火电汽轮机，核电汽轮机低压转子的动平衡影响系数偏低。关键词：核电汽轮机；低压缸；摩擦；振动；端部汽封体分类号：TK２6８文献标识码：A文章编号：1００1-５８８４（２０17）０４-０3０6-０４ExperimentalStudyonF

3、rictionVibrationbyLowPressureRotorofNuclearPowerSteamTurbineZHOUPeng，YANGZhang（NingdeNuclearPowerCompany，Ningde3５５２００，China）Abstract：Thevibrationcharacteristic，mechanismandtreatmentmethodoffrictionbetweenthelowpressurerotorandtheendsealofnuclearpowerstreamturbinea

4、restudied.Duringthecommissioningofanuclearpowerstreamturbine，itisfoundthatthevibrationamplitudesoflowpressurerotorsincreasedslowlyandslowly.Afteranalyzingthevibrationspectrum，amplitudetrend，operatingcondition，lowpressurecylinderstructureandsoon，it＇sdiagnosedthatsl

5、ightfrictionhappensbetweenlowpressurerotorandendsealbodywhicharosebylowpressurecylinder＇sdistortion.Andthedistortionoccursbyconcaveduetothesecondcirculatingpump＇sstartingsuddenly.５hourslater，thevibrationvaluesdecreasedslowlyandreturnedtonormalbyrunning-inoperation

6、mode.Itisfoundthatthereareobviouswearmarksonthetipsofthelowerpartofthesealbody，andalsoonthegudgeonjournal＇ssurface.Duringthestart-upprocessoftheunit，thedeformationofthesealbodyismeasuredwhichisabout1mmwhenthecondenserevacuated.Afteraddingreversebalancingweightstoi

7、mprovelowpressurerotor＇sbalancingprecision，thefrictionavoidedsuccessfullybythevibrationlevelreducedgreatly.Thestudyhasalsofoundthatcomparedtothethermalpowersteamturbine＇slowpressurerotor，thedynamicbalancecoefficientofnuclearpowerstreamturbineislower.Keywords：nucle

8、arpowersteamturbine；lowpressurecylinder；friction；vibration；sealbody动特性、产生的机理及治理措施。０前言1核电汽轮机介绍根据《电力发展“十三五”规划》（２０16－２０２０年），“十三五”期间全国核电投产约3００００MW、开工建设3００００