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SCR脱硝系统导流板优化数值模拟.docx

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SCR脱硝系统导流板优化数值模拟 Abstract TheoptimizationofthediversionboardinSCRdenitrificationsystemisaproblemthatneedstobesolvedtoimprovetheefficiencyandreducethecostofthesystem.Inthispaper,numericalsimulationisusedtooptimizethedesignofthediversionboard.Theeffectsofdifferentdesignsontheflowfieldanddenitrationefficiencyareanalyzed.Theresultsshowthattheoptimaldesigncansignificantlyimprovetheflowuniformityanddenitrationefficiency. Introduction SCR(selectivecatalyticreduction)denitrationtechnologyhasbeenwidelyusedincoal-firedpowerplantsandotherchemicalindustriesduetoitshighdenitrationefficiencyandlowoperatingcost.OneoftheimportantcomponentsintheSCRsystemisthediversionboard,whichisusedtoevenlydistributethefluegasandammoniaintothecatalystlayertoensurethatthewholecatalystlayerisusedeffectively.However,thetraditionaldesignofthediversionboardmayleadtounevendistributionoftheflowfieldandthecatalyticreactionrate,resultinginlowerdenitrationefficiency. Withthehelpofnumericalsimulationtechnology,theflowfieldandthedistributionofammoniacanbebetterunderstood,andthedesignofthediversionboardcanbeoptimizedtoimprovetheefficiencyoftheSCRdenitrificationsystem.Inthispaper,theeffectsofdifferentdiversionboarddesignsontheflowfieldanddenitrationefficiencyaresimulatedandanalyzed. Methodology ThenumericalsimulationoftheSCRsystemwasperformedusingthecommercialsoftwareFluent.Thesimulationmodelincludestheflowfield,ammoniainjection,andcatalyticreactionprocesses.Thestandardk-εturbulencemodelandfinite-ratechemistrymodelwereusedinthesimulation.ThecomputationaldomainofthemodelisshowninFig.1. Fig.1ComputationaldomainoftheSCRsystem Thesimulationswereconductedforthreedifferentdiversionboarddesigns,namely,thetraditionalsimpleplatedesign,thegroovedesign,andtheporousplatedesign.Theparametersforthesimulationincludetheinletvelocity,inlettemperature,andinletconcentrationofNH3. ResultsandDiscussion Fig.2showsthevelocitydistributionofthethreedesignsattheheightofthecatalystbed.Itcanbeseenthatthesimpleplatedesignleadstoanunevenflo