脱硫塔外文翻译.docx

脱硫塔外文翻译.docx

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脱硫塔外文翻译

ResearchandDevelopmentofBaosteelSwirl-JetSinteringFlueGasDesulphurizationTechnology

SHENXiao-lin,LIUDao-qing,ZHOUJing

（EnvironmentandResourcesInstitute,R&DCenter,BaoshanIronandSteelCo.,Ltd.,Shanghai201900,China）

Abstract:

TheresearchbackgroundandtechnicalfeaturesofBSFGD（Swirl-Jet-AbsorbingWetLimestone-gypsumSinteringFGDTechnology）processandequipmentswereintroducedhereindetail.Themaincontents,achievementsof

pilotexperiments,andengineeringpracticesofBSFGDwereanalyzedanddiscussedsystematically.Pastengineering

practiceexperiencesindicatethefactisthatthetechnologyhasthefollowingmerits,wideapplicabilitytosinteringfluegas

featuressuchastemperaturechangingfrequently,SO

concentrationbeingunstable,flowratefluctuatingintensively;highpollutantsremovalefficiency;lowinvestmentandenergyconsumption;stableandreliablerunning;utilizablebyproduct（gypsum）etc.IthasbeenprovedthatBSFGDhasthevalueofawiderangeofapplicationsforlargeandmedium-sizedsinteringmachinesfluegasdesulphurizationinthesteelindustry.

Keywords:

sinteringfluegas;desulphurizationtechnology;research;engineeringpractice

1Introduction

Atthebeginningofthecentury,whilewasconstituted,theexpertsofmetallurgypointoutthat“Duetothecomplicacyofagglomerateandtheothernessofsinteringprocess,thetechnologyoffluegasdesulphurizationusedinpowerplantscouldnotbeappliedinsinteringfluegasdesulfurizationdirectlyandblindly.TheinvestmentandrunningcostofFGDtechnologyusedinIronandSteelIndustryofotherdevelopedcountriesareusuallytooexpensivetobeacceptedbyChinesecompanies.”Therefore,thetechnologyofsinteringfluegasdesulfurizationinchinawaslistedasimportantstudytopicin.Sincetherearefewresearchesandtechnologiesexistinginthisarea,it’ssignificanttoinventatechnologywiththepropertiesofefficient,highlyadaptive,cost-effective,safeandreliableinoperationforChineseIronandSteelcompanies.Inchina,BaosteeltakestheleadinsinteringFGDtechnologyresearchanddevelopmentatbeginningoftheyear2005.

2TheFeaturesofBaosteelSinteringFlueGasDesulfurizationTechnology

Accordingtotheproductioncharactersoflarge-scalesinteringmachine,consideringtheapplicationofdesulfurizeranddesulfurizingproductandtheactualconditionofcompany,wecontrastandanalyzethetechnologyofFGDusedinmarketwidelyanddeeply.Choosingwetlimestone-gypsumsinteringfluegasdesulfurizationasthebaseoftechnicalrouteandthenstartingtoresearchanddevelopthroughindustrialtestspointatthesinteringfluegasfeature,andfinally,andformedserialtechnologyandequipmentofBaosteelSwirl-Jet-AbsorbingWetLimestone-gypsumSinteringFGDwithownintellectualpropertyrights（ReferredtoasBaosteelSinteringfluegasdesulfurizationtechnology,andabbreviatedasBSFGD）.

2.1Introductionofprocessflow

Fluegasflowfrommainsuctionfansofsintermachinesbepressurizedbyboosterfan,thenbecooledandpretreatedincoolingequipment,andthenperformthedesulfurizationreactioninSwirl-JetAbsorber,thepurifiedfluegasdischargefromchimneyonstandardafterdemisting.TheauxiliarysystemssuchaslimestoneslurrypreparationandgypsumdehydrationsystemarethesameasnormalwetFGDsystem,whicharematuretechniques.TheprocessflowdiagramofBSFGDisshowninFig.1.

2.2Technicalfeatures

2.2.1Baosteelswirl-jet-absorbingwetlimestone-gypsumsinteringFGDtechnology

Uselimestonepowders（250meshes）asdesulfurizingagent,Ca/Sisequalto1.01to1.03,andthecostofdesulfurizerislow.TheFGDsystemrunsteadilyandsafely,over95%synchronousoperationratewithsinteringmachine.Thedesulphurizationefficiencyisgreaterthan90%,theexhaustconcentrationofSO

anddustislessthan100and50mg/m

separately,andtheremovalefficiencyofSO

HClandHFwillbegreaterthanorequalto50%,80%and90%separately.Thegypsumisgoodenoughtomeettherequirementsofusingasresources,inwhichthecontentofCaSO

·2H

Oisover90%,thecontentofmoistureisbelow10%,thepHvalueis6-8.Itshowsexcellenteconomicsthattheinvestmentandoperationcostis70%-80%tothecostofothersinteringfluegasdesulfurizationtechnology.

2.2.2Coolingdeviceforpretreatment

Acoolingdeviceaspretreatmentwassetbeforetheabsorbingtowertoovercomethedifficultytocooldownthefluegaswhosetemperaturefluctuatedseriouslyandfrequently,maintainthesafetyofabsorbingtowerandprovidethebesttemperaturefordesulphurizationreaction.Thiscomponentwashelpfultoprotectthegas-gasheater（GGH）fromblockingintraditionalFGDtechnologyandtopromotethecoolingefficiencyoffluegas.Theheavymetals,alkalimetalsandapartofdustinfluegaswereremovedbythedevice,whichwasusefultorestraintheblockingproblemandscaleformationintheabsorbingtowerandimprovethequalityofgypsum.Furthermore,mostHFandHClinfluegaswereremovedbythedevice,whichcanpreventerodingforthematerialofabsorbingtowerandothersubsequentdevices.

2.2.3Swirl-jet-absorbingtower

Thereactioncontainerwasdesignedtobetheswirl-jetabsorberonthebasisofaerodynamicsknowledge.Thelimestoneslurryintheabsorberperformedascontinuousphase,thefluegaswaseruptedfromSwirl-Jetdeviceandseparatedintofinebubblesintheabsorber,asdispersionphase.Thenthegasandthelimestoneslurryreactedthoroughlywithhighmasstransferefficiency.ThisprocesscankeepthesystemstablewhenviolentfluctuationoffluegasflowrateandSO

concentration,withhighdesulphurizationanddedustingefficiency.Inthisprocess,theabsorbingreactioncanbecompletedinonecycle,sothatthelimestoneslurrydon’tneedtoberepeatedlycycled,whichcanlowertheenergyconsumption,Furthermore,theproductsofgypsumwerewell-crystallized,largerparticlesize,andutilizable.

2.2.4Integrateddemister

Theexpansivespaceinthetopoftheabsorber,whichisempty,combinedwiththeexternaldemistertocomposeintegrateddemister,whichisgoodforeliminatingthemoistureinthefluegas.

3TechnicalDevelopmentsinPilotExperimentandEngineeringPractice

3.1Deviceforpilotexperiments

Thepilotexperimentssystemwithcapacityof90000m

/hfluegasiscomposedofsixsubsystemsasfollowing:

SO

absorbingsystem,limestoneslurrypreparationsystem,fluegassystem,gypsumdehydrationsystem,processwatersystemandDCScontrolsystem.Fig.2.

3.2Researchcontentinpilotexperimentandengineeringpractice

（1）Throughexperimentalstudyoneveryinfluencingfactorsofdesulphurizationefficiency,foundoutthemainfactorsandessentialstoensureFGDsystemrunningcontinuallyandsteadilyinthelongterm,madethedebugging-programsoflarge-scaleFGDproject,anddevelopedcompletesetofrules,specificationrequirements,andstandardsforBSFGD,etc.

（2）Byexperimentalinvestigationonavarietyofswirl-jetdevicesandcoolingpre-treatingmethods,wehaveobtainedthebestconfigurationanddesignparametersofprocessingparametersandkeyequipments,andestablishedthethermodynamicanddynamiccalculationmodelsofFGDsystem.

（3）Throughlong-termexperimentatpilotplant,searchanddiscoverlawsandsolutionstovariousproblemsthatmayoccurinsinteringfluegasdesulfurizationprocess,suchasclogging,deposition,etc.Developcontrolprogramsoflarge-scaleFGDproject,suchasthekeyparameters,instrumentconfiguration.

（4）Inresponsetothetechnicalrequirementsthatthesurfaceofslurrytankmustbesteady,carryoutexperimentsonside-entryslurryagitationandoxidationairdistribution,setuprelevantmodels,findoutvariouskindsofcontrolparameterlaws,developcompletesettechnologyofslurryagitationandforcedoxidation.

（5）Carryoutantisepticsexperimentsofover100testpiecesateveryrepresentativesite,providethebasisforantisepticsselection,developseveralspecial-purposeantisepticscalyclayssuitabletosinteringFGD,andacompletesetofantisepticprogramofsinteringFGDproject.

（6）Developsuchseriessetsofmanufacturing,processingandinstallingtechnologyofsinteringfluegasdesulfurizationsystem,andprovidetechnicalguidance.

（7）ExperimentalstudyonEmergencyPreparednessforemergencysituations,developrelevantemergencypreplanstechnicalregulation.

（8）ResearchontheutilizationofSinteringFGDgypsum,suchasaddingtosteelslagpowderorslagpowdertosubstituteforcementdirectly,andachievedsignificantresults.

（9）ResearchandanalyzethecharacteristicsofsinteringFGDwastewater,developwastewatertreatmentandreusetechnology,proposewastewatertreatmenttechnologyandprogram.

（10）Feasibilitystudyprogram,preliminarydesign,anddesignschemeshavebeenmadeforthreetypicallarge-typesinteringFGDprojectsinthewholemetallurgicalindustry,whichhavewithdifferentfluegasflowratesanddifferentcharacteristics.

4EngineeringApplications

Byexperts'evaluation,BaosteeldecidedtoputtheresultsofBSFGDresearchintopracticalapplication.Basedonunifiedplan,theBSFGR&DTeamofBaosteelResearchInstitutewasresponsibleforthecompletionoftechnicalassembly,andsupportedcomprehensivetechnicalguidanceandsupportforlayoutofplant,configurationandmanufactureofequipments,heartsystemconstruction,debugging,andoperating,etc.

4.1Scaleofprojects

Overview