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1、AbstractThepipelinetransportationofcrudeoilisaveryimportantaspectinthedevelopmentprocessofChina'soilindustry.Inordertoensurethatthecrudeoilpipelinesflowingsmoothlyandforbidpipesgettingclogged,thetemperatureofcrudeoilmustbecontrolledtomakeitstabilizeatareasonabler
2、angeintheprocessofcrudeoiltransportation.Crudeoilheatingfurnaceisgenerallyclassifiedintotwotypesofdirectandindirectheating.Inthispapertheselectedresearchobjectheatingfurnaceisakindofindirectheatingfurnace.PIDcontrolalgorithmisverycommoninthetraditionalwaysoftempe
3、raturecontrol.Inthispaper,basedonthediscussionofadvantagesanddisadvantagesofPIDcontrolalgorithm,combinedwiththecharacteristicsofthefuzzycontrol,anewtypeofcontroller,nine-pointcontroller,isappliedtoheatingfurnacetofulfilltemperaturecontrolofheatexchanger.Nine-poin
4、tcontrollerisproposedonthebasisoffuzzycontrolandbasiclogiccontrol,inwhichsystematicbiasandbiaschangeratearethebasicparametersofthetheory.Byanalyzingtheallowablerangesofdeviationanddeviationchangerate,theoperationstateofthesystemisdividedintoninerunningintervals,a
5、nddifferentmeasuresareemployedinthelinkpofthePIDaccordingtothecorrespondingcharacteristicstoimprovethecontroleffect.Theprincipleandapplicationofnine-pointcontrollerarediscussedinthepaperandheatexchangertemperaturecontrolsystemsolutionofheatingfurnaceisputforward.
6、Andsimulationexperimentsofthecontrolalgorithmarecompletedwithemulatorsoftware.Thecontrolsystemmainlyincludesacontrollogicmodule,acommunicationmodule,human-computerinterface,etc.,inwhichcontrolsystemselectsRockwelllogix5500PLCcontroller,thecommunicationmoduleadopt
7、sOPCcommunicationprotocol.Meanwhile,RSLinxachievesthereal-timemonitoringandlogiccontrolbysettingOPCparameters,andtheproductionofman-machineinterfaceisimplementedbasedonForceControl6.0platform.Logicredactionisrealizedbasedonup-ladderdiagramprogramminglanguageofsof
8、twareRockwelllogix5000.Experimentsshowthatthetemperaturecontrolsystemcanwellrealizethetemperaturecontrolofheatexchangerinheatingfurnaceandachievetheexpectedcon
