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ID:36604357
大小:6.26 MB
页数:99页
时间:2019-05-12
《电站锅炉实时故障诊断研究》由会员上传分享,免费在线阅读,更多相关内容在学术论文-天天文库。
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
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