电站锅炉实时故障诊断研究

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1、华北电力大学（北京）博士学位论文电站锅炉实时故障诊断研究姓名：王洪江申请学位级别：博士专业：热能工程指导教师：孙保民20080501．一／＼13翌!!垒g——一———————————————————————————————————————————————一一ABSTRACTTheboilerinpowcrplantisacomplexsystem，withstrongcouplingamongP。occssvariables．Duetomostofitsequipmentsunderhighte

2、mperatureandpressureenvironment，itisthemostinstableunitinpowerstation．Therefore，itisimportanttorsafetyinproductiontomonitoroperatingparametersofboileranddiagnosefaultaccordingtotheabn,)rmaloperatingparameters．Accordingtothecharacteristicotoperationmo

3、deinproductionprocess：theoriesandapproachesoffaultdetectionanddiagnosis(FDD)arelnainlystudiedinthispaperandappliedtorealdesignofFDDforfoulingofheattransfersurfaces．Dia2nosisbasedOHdynamiccausalmodel(DCM)isadynamicfaultdiagnosismethodcombiningqualitat

4、ivereasoningandquantitativecomputatmn，whichcanexpresscomplicatedcause—effectrelationshipandhascapacityofcontaininglarge—scaleDotentialinforrnationandgoodcompleteness．Ontheha．qisofsum．m_arizingtheexisting1iteraturesofr1。⋯．1tl“ltdiagnosisbased01)L,Clvl

5、method，l“．／q“k)IV。IisfirstpresentedtoapplylnfauItdiagnosisofboilerinpowerplant．TwokindsofresidualsprovidedbyDCM，whichoneislocalresidualandtheotherisupstreamresidual，areinsensitivetofaultdetection，furthermoreupstreamresidualoffaultnodeincausalgraphmus

6、tberecoilstructlonduringfauItisolation．Inthispaper：anotherkindofresidual，whichismoresensitivetot-ault．isconstructedtosubstitutefofupstreamresidual．TheimprovedmethodavoidstheshortcomingofDCM，andimprovesthediagnosticspeed·Forprocessandsystemswithcomple

7、xnon—linearity,eliminatingallunknownvariablcsisnottrivial，e．苎．inthZ-presenceofalgebraicloops，implicitequanons，non．invertiblefunctions，etc．However，mostsymbolicallynon·resolvablerelationshipscanbenumericallysolved，diagnosticbondgraphmodel(DBGM)isusedto

8、derivenumericalresidual．Inthispaper,theideaofcombiningDBGMwithDCMisfirstpresentedtoFDDofcomplexnon．1inearitysystems．DBGMisusedfordetectingfaults，andDCMisusedforexplainingtheresidualbydiagnosticreasoningincausalgraPn·Theadvantageisthediagnosistimeusin