batch process control - the college of engineering at ：间歇过程控制工程学院

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1、BatchProcessControlIntroductionSequentialandlogiccontrolControlduringthebatchRun-to-runcontrolBatchproductionmanagementIntroductionBatchoperationisverycommoninthespecialtychemical,pharmaceuticalandmaterialsprocessingindustriesMultiproductbatchplantsproduce

2、arangeofsimilarproductsusingthesameequipmentBatchcontrolisparticularlydifficultbecausethereisnosteady-stateoperatingpointandprocessesoperateoverawiderangeofconditionsBatchprocesscontrolsystemsinvolvesequencingofdifferentprocessstepsandcontrolduringthebatch

3、Run-to-runcontrolusesexperiencefrompreviousbatchrunstoimprovethecurrentrunBatchplantschedulingandplanningareusedtomanagetheproductionofdifferentproductsBatchDistillationExampleBatchControlSystemsSequencingandlogic–sequencingofcontrolstepsaccordingtoapredef

4、inedrecipeControlduringthebatch–trackingofpredeterminedsetpointtrajectoriesRun-to-runcontrol–end-of-batchmeasurementsareusedtoimprovecontrolofnextbatchBatchproductionmanagement–planningofproductionneedsandschedulingofproductcampaignsSequentialandLogicContr

5、olControlofbatchunitoperationsinvolvesthepropersequencingandexecutionofspecificstepsSequentiallogiccanberepresentedinseveralways,suchasinformationflowdiagramsInformationflowdiagramscanbetranslatedintodigitallogicdiagramstobeexecutedbyprogrammablelogiccontr

6、ollers(PLCs)PLCscanexecutesequencingoperationsarewellasstandardPIDcontrolalgorithmsPLCsarethekeycontrolhardwareusedinbatchplantsBatchSequenceControlExampleControlDuringtheBatchExecutionofsequencedoperationsofteninvolvesfeedbackcontrolofspecifiedoutputsBatc

7、hcontrolischallengingbecausethereisnosteady-stateoperatingpointandprocessesoperateoverawiderangeofconditionsTrackingofpredeterminedsetpointtrajectoriesisoftenrequiredProcessnonlinearitiesandmodelinaccuraciesbecomemorepronouncedwhenprocessesareoperatedoverl

8、argeregimesSomeproductpropertiesaffectedduringabatchareirreversibleonceofftargetBatchReactorControlPIControlofBatchReactorsStandardPIControllerPIControllerwithPreloadRapidThermalProcessingRapidThermalProcessi