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1、chemicalengineeringresearchanddesign89(2011)2652–2666ContentslistsavailableatScienceDirectChemicalEngineeringResearchandDesignjournalhomepage:www.elsevier.com/locate/cherdAnautomaton-basedapproachtoevaluateandimproveonlinediagnosisschemesformulti-failurescenariosinbatchchemicalprocessesMing-
2、Li?Yeh,Chuei-TinChangDepartmentofChemicalEngineering,NationalChengKungUniversity,Tainan70101,Taiwan,ROCabstractOnlinediagnosishasbeenconsideredasanimportantmeasureforimprovingoperationalsafetyinmanybatchchemicalplants.Speci?cally,thestatetransitionbehaviorsofallhardwareitems(components)inthe
3、givenbatchprocessandtheirfailuremechanismsaremodeledsystematicallywithautomata.Thesystemmodelisthenassem-bledbyconnectingthecomponentmodelsonthebasisofagenerichierarchicalstructure.A“diagnoser”canbeconstructedaccordinglyforthepurposeofdeterminingvariousqualitativeandquantitativeperformancein
4、dices.Guidedbytheseindices,twoperformanceenhancementapproachescanbeeffectivelyapplied:(1)installingaddi-tionalsensorswhicharenotincludedinthepipingandinstrumentationdiagram(P&ID)and(2)executingextraoperationstepswhicharenotspeci?edinthesequentialfunctionchart(SFC).Threeexamplesarepresentedin
5、thispapertodemonstratethefeasibilityoftheproposedapproach.?2011TheInstitutionofChemicalEngineers.PublishedbyElsevierB.V.Allrightsreserved.Keywords:Automata;Batchoperation;Diagnosability;Faultdiagnosis;Faultpropagationtrace;Shannonentropy1.continuouschemicalprocessesinthepast,whilesigni?cantl
6、yIntroductionlessefforthasbeendevotedtothebatchoperations.NoticeHardwarethatonlinefailureidenti?cationinthelattercaseisamuchfailuresinchemicalplantsshouldbeviewedasmoredif?culttask.Thisismainlyduetothefactthatacon-unavoidablebutrandomevents.Theycanusuallybeattributedtinuousprocessissupposedt
7、obemaintainedatsteadystate,tocontrollermalfunctions,actuatorfailures(e.g.,butvalvethebatchsystemstateusuallychangeswithtime.Vari-sticks,pumpfailuresandcompressorfailures),con-tainmentousdifferentdiagnosticstrategieshavealreadybeenadoptedfailures(e.
