300MW级燃煤电站锅炉烟气低温脱硝及脱汞试验研究

300MW级燃煤电站锅炉烟气低温脱硝及脱汞试验研究Title:ExperimentalResearchonLow-TemperatureDe-NOxandDe-MercuryofFlueGasfrom300MWCoal-FiredPowerPlantBoilerAbstract:Thispaperpresentsanexperimentalstudyonthelow-temperaturede-NOxandde-mercuryprocessesoffluegasesemittedfroma300MWcoal-firedpowerplantboiler.Withincreasingconcernsregardingairpollutionandtheadverseeffectsofnitrogenoxides(NOx)andmercury(Hg)emissionsontheenvironmentandhumanhealth,itiscrucialtoinvestigateeffectiveandefficientmethodsfortheremovalofthesepollutants.Thisstudyfocusesontheapplicationoflow-temperatureselectivecatalyticreduction(SCR)toachievede-NOx,aswellasvarioustechnologiesforde-mercury,includingactivatedcarboninjection,brominatedcarboninjection,andoxidation-reductionofmercury.Theexperimentalsetupincludesapilot-scalefacilitysimulatingtheboilerconditionsandfluegascompositionofthepowerplant.Theresultsindicatethatthelow-temperatureSCRprocesseffectivelyreducesNOxemissions.Amongthetestedcatalysts,theV2O5-WO3/TiO2catalystdemonstratedthehighestNOxremovalefficiency.Additionally,theeffectsofreagent-to-NOxratio,reactiontemperature,andgasresidencetimeonthede-NOxperformancewereinvestigated.Regardingde-mercury,activatedcarboninjectionshowedpromisingresults,achievingefficientmercuryremoval.Theoptimumactivatedcarbondosagewasfoundtobe5-8mg/Nm3.Thepresenceofhalogencompounds,suchasbromine,inthefluegasdemonstratedenhancedHgremovalefficiency.Thecombineduseofactivatedcarbonandbrominatedcarboninjectionresultedinthehighestde-mercuryperformance.Furthermore,theoxidation-reductionmethodformercuryremovalwasevaluated.Theuseofhydrogenchloride(HCl)formercuryoxidationfollowedbyactivatedcarboninjectionshowedsignificantlyimprovedmercuryremovalefficiency.Basedontheexperimentalresults,acomprehensiveapproachforsimultaneousde-NOxandde-mercurytreatmentisproposed,involvinglow-temperatureSCR,activatedcarboninjection,andbrominatedcarboninjection.Thisapproachdemonstratesefficientpollutantremovalcapabilitiesandcanbeappliedtothe300MWcoal-firedpowerplantboilerforeffectivereductionofNOxandmercuryemissions.Keywords:300MWcoal-firedpowerplant,low-temperatureSCR,de-NOx,de-mercury,activatedcarboninjection,brominatedcarboninjection1.Introduction1.1Background1.2Significanceofthestudy1.3Objectives2.LiteratureReview2.1NitrogenOxides(NOx)2.2Mercury(Hg)Emissions2.3De-NOxTechnologies2.4De-MercuryTechnologies2.5PreviousResearch3.ExperimentalSetup3.1FlueGasSimulation3.2Pilot-ScaleFacilityDescription3.3AnalyticalMethods4.Low-TemperatureDe-NOxProcess4.1CatalystSelection4.2EffectofReagent-to-NOxRatio4.3EffectofReactionTemperature4.4EffectofGasResidenceTime5.De-MercuryTechnologies5.1ActivatedCarbonInjection5.2BrominatedCarbonInjection5.3Oxidation-ReductionofMercury6.ExperimentalResultsandDiscussion6.1De-NOxPerformance6.2De-MercuryPerformance7.ComprehensiveApproachforSimultaneousDe-NOxandDe-Mercury7.1OptimizationofParameters7.2FeasibilityAnalysis8.Conclusion8.1SummaryofFindings8.2RecommendationsforFurtherResearchReferencesThisoutlineprovidesastructureforyourpaper,andyoucanexpand