汽轮机排汽湿度微波谐振腔测量技术的研究

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1、华北电力大学（保定）博士学位论文汽轮机排汽湿度微波谐振腔测量技术的研究姓名：韩中合申请学位级别：博士专业：热能工程指导教师：杨昆20051101华北电力大学博士学位论文AbstractSteamturbineplaysadominantroleinpowergenerationindustryintheworld．ThelastfewLPstagesofcondensingturbinesforthefossil—firedpowerplantandtheallstagesofnuclearturbinesoperateinwetsteamregion．Thewet

2、steamappearingintheturbinedecreasestheefficiencyandmayerodethebladeofturbinestages．nledegreeofWetnesslossesandthebladeerosionarecloselyrelatedtothevalueofthestagewetnessandthewetnessdistribution．Inordertoimprovetheefficiencyandtheoperationreliabilityofsteamturbine，itisnecessarytoknowth

3、esteamwetnessfractionanditsdistributioninturbinestages．Inthisthesis，thecalculationandtlledetectionmethodsofsteamwetnessfractionforturbineexhaustarestudied．Anewthermodynamicmethodforonlinecalculatingtheaveragewetnessofacondensingturbineispresented．Inthismethod，theturbine，condenserandext

4、ractionfeedwaterheaterareregardedasaclosethermodynamicsystem．111eaveragewetnessoftheturbineexhaustiscalculatedaccordingtotheenergybalanceprinciplewiththeparametersofthemassflowratesofthemainsteam，reheatsteamandturbineexhauststeam，whichareobtainedwithFlfigelformulaandtheimprovedFliigelf

5、ormulabyusingthethemaalparametersprovidedbytheunitmonitoringsystem．Itisnotneedtocalculatethefeedwaterheatingsystemindetail，sotheaccumulatedmeasurementerrorwouldbereducedandtheerrorresultedfromtheignoringoftheshaftglandleakageandthegatepoleleakagecouldbeavoided．Theaveragewetnessfraction

6、ofa200MWanda330MWturbineexhaustarecomputed．111ecalculationresultsshowgoodaccuracyandefficiencyofthismethod．Amethodforthesteamwetnessmeasurementbasedonmicrowaveresonatorperturbationprincipleforturbineexhaustispresented．111edielectriccharacteristicsofturbinewet-steamisstudied．Atthenormal

7、conditions，thevariationinthedielectricconstantofsteamturbineexhaustisverysmall．Themicrowaveresonatorperturbationtechnologyisappliedtosteamwetnessmeasurementforthefirsttime．Thekeyproblemsofthismeasurementtechnologyareinvestigated．nlemeasurementsystemofmicrowaveresonanceisdesignedaccor