汽轮机排汽湿度在线监测方法及应用研究

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1、g8{0562汽轮机排汽湿度在线监测方法及应用研究(申请华北电力大学工学博士学位论文)培养单位：一级学科：专业名称：研究生：指导教师：能源与动h-r-程学院动力工程及工程热物理热能工程王升龙杨善让教授2005年11月ABSTRACTInmodernthermalpowerplants，thefinalseveralstagesincondensatesteamturbineandallthestagesinnuclearsteamturbineoperateinwetsteamregion，thedrain

2、erosiononbladeiscausedbythewetnessfraction，theoperationsafetyofsteamturbineisthreatenbythebladeerosion．Atthesametime，thebladeerosionincreasestheflowlossesinflowpassage，whichdecreasestheefficiencyofsteamturbine．Furthermore，themoisturelossdecreasestheefficie

3、ncyofsteamturbinetoo．SOthewetnessfractionhaveagreatinfluenceontheoperationofsteamturbineaboutsafetyandefficiency．Theenthalpycouldnotbedeterminedbypressureandtemperatureduetotheexhaustinthewetsteamregionwhenwecomputethethermalparametersonefficiency，onlinemo

4、nitoringtheexhaustwetnessfractionisnecessary．Iftheexhaustwetnessfractionweremonitored，thethermalparametersonefficiencywouldbecredible．Becausetheyshowtherealoperationstateonsteamturbine，theoperationinstructionandmaintainofequipmentisbasedontherealcondition．

5、Therefore，itissignificantformonitoringthewetnessfractiononlineinexhaustofsteamturbine．Manymethodsofmeasuringwetnessfractionisanalyzedandcomparedinthisthesis，theheatingmethodischosenasthebasisofmonitoringthewetnessfractiononlineinexhaustofsteamturbine．Atpre

6、sent，heatingmethodhavesomedisadvantage，Inordertoovercomethedrawbackofmeasuringmethod．anewmethodofdoubleregionheatingispresentedforonlinemonitoringthewetnessfractioninsteamturbineexhaust．Theevaporationtubelengthandcriticalheathaveimportantinfluencesondesign

7、andmeasuringforheatingmethodwetnessprobe，theevaporationtubelengthofwaterdropiscomputedbynumericalmethodattheconditionsofturbulenceflow，compressible，andcoupledtwo-phase，thencombinedwithcriticalheat，therangeadjustmentofheaterpowerisdetermined，whichprovidesth

8、ebasisofdesignofdoubleregionheatingwetnessprobeandadjustmentofmeasurement．Basedonthedoubleregionheatingmethod，anewstylewetnessmeasurementprobeisdesigned．Atpresentcondition，thespecialwetsteamwithcertainwetness