Process Design and Control Studies of an Elevated-Pressure Air

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1、2010AmericanControlConferenceWeC12.6MarriottWaterfront,Baltimore,MD,USAJune30-July02,2010ProcessDesignandControlStudiesofanElevated-PressureAirSeparationsUnitforIGCCPowerPlantsPriyadarshiMahapatraandB.WayneBequetteAbstractInthisstudy,asupervisorycontrol

2、lerforanASU[8].Adynamicmodelforlow-pressure(LP)strippingand(AirSeparationsUnit)hasbeendesignedbasedonaMPChigh-pressurerectificationcolumnsaspartofIGCCpower(ModelPredictiveControl)approach.ThishasbeenappliedtoplanthasbeengivenbySeligeretal.[9]andHankeetal

3、.adetailedpressure-drivenAspenPlus/AspenDynamicsmodel[10].ThesestudiesweredonewithsignificantassumptionstounderstandtheperformanceofamultivariableMPCwhenadoptedforsuchacomplexprocesswithcriticaltargets.Inthatmightdiminishenergy-integrationeffectsondynami

4、csaddition,aneffectivePI-basedsecondary-layeredcontrollerandcontrollabilityoftheentireplant.Noneofthesestudiesdesignhasbeenproposedforopen-loopstabilityandmaxi-considerthepossibilityofpositivefeedbackeffectduetomizingoxygenyield.TherigorousAspenmodelisi

5、nterfacedfeed-productheatintegrationinthemainheatexchanger.withMatlab/SimulinkandhasbeenusedasarealplantAdditionally,thecondenser-reboilerheateffectshavebeenwhenperformingthesteptestsfortheidentificationofthesimplifiedlinearmodelandapplicationofsupervisor

6、ycontrol.decoupledandthebehaviorofoneofthecolumnsisinves-TheeffectivenessofthedesignedcontrollerhasbeenprovedtigatedindependentlyfromtherestoftheplantbyusuallythroughthecomparisonbetweenthelinearMPCapproach,consideringjustasinglevariable(temperature)eff

7、ectfromthathandlesabsoluteandrate-of-changeconstraints,andatheothercolumnasaninputvariable.Theseapproximationsmoreconventionalcontrolconfiguration.Theresultsshowaalthoughvalidforanalysisofsinglecolumnsmightnotsignificantreductioninovershootsandsettlingtim

8、eduringloadvariations.ThepaperclearlyshowshowtheMPCapproachforcapturerealpressuredynamicswhenthecoupledcaseisasupervisorycontrollayerisreliable,easytodesignandofrealconsideredsincemorethanonematerialstreamconnectsthevalueforpract