简介：ThepaperwillgiveanoverviewabouttheCOREX?plantsinoperation,showthenewdevelopmentsandfindingsfortheCOREX?processi.e.arealgasdistributionandcoalbriquettingandthestatusoftheFINEX?technologywillbegiven.

简介：Ultrapureferriticstainlesssteelisakindofnewstainlesssteelgradewithhighqualitydevelopedinthemid-twentiethcentury,itischaracterizedbyultralowCarbonandNitrogencontentandmicro-alloyingwithTi,Nb,V,Cuetc.,soitovercomesalotofuseshortcomingsoftheordinaryferriticstainlesssteel,suchasintergranularcorrosionsensitivity,lowductilityandtoughnessunderatmospheretemperature,crackincliningattheweldzoneetc.,namely,ithasbetterperformancethantheordinaryferriticstainlesssteelintheaspectofcorrosionresistance,toughnessandweldabilityetc.Furthermore,aseriesofsecondaryrefiningequipmentsandtechnologieshavebeeninventedfromthe1960s,loworultralowCarbonandNitrogencontentinthemoltenstainlesssteelcanbeobtainedduringmanufacturingproduction.Therefore,suchsteelhasbeenappliedinmanyfields,leadingtotheveryrapiddevelopmentoverthepasthalfcentury.Thispaperfocusesonthesecondaryrefiningprocesswhichisthemostimportantstepofthewholesteel-makingprocessfortheultrapureferriticstainless.Firstly,somedifficultiesofthesecondaryrefiningprocessaredescribed,includingthehighpurificationintermsofbothCarbonandNitrogencontents,highefficientandstablecontrol.Secondly,thedevelopmentandprogressofthesecondaryrefiningtechnologyforultrapureferriticstainlessisintroducedintermsoftherefiningequipments,metallurgicalprocessandassistanttechnologies.SomemostfamoussecondaryrefiningequipmentsandmetallurgicaltechnologiesforultrapureferriticstainlesssteelhadbeeninventedmainlybyJapanandEuropeancompaniesfrom1960sto1990s,suchasVOD,SS-VOD,AOD-VCR,VOD-PBetc..Duringthesametimeofwideapplicationofthesesecondaryrefiningequipmentsandtechnologies,inordertostrengthenthefunctionandcapacityoftheserefiningequipments,someadvancedassistanttechnologieswerealsointroducedandapplied,whichconsistsoftoplance,specialrawmaterials,ladlerefracto

简介：ShorttapholelengthisoneofthemosttroublesomeproblemsofBaosteel’sCorex-3000afteritsstartup.Owingtothemeltergasifierprocess,thecharbedfloatedupanddownasthelevelofhotmetalandslaginhearthchanging.Thesecausealotofproblemssuchastheheavyerosionoftapholeareasandhardcasthousework.ThehighsecondtappingflowisanoticeablecharacteristicofCorexprocess.Thereasonsofshorttapholeisanalysed,andcountermeasuresareputintopractice,someimprovementsarecarriedoutinmodule2Corex-3000.

简介：Byanalyzingthethermalandburdenstructureconditionsinsidethemelter-gasifierofCOREXprocess,theadvantageanddisadvantageofPCIintothemelter-gasifierareclarified.TheinfluenceofPCIontherunningconditioninsidethefurnaceisanalyzedbasedontheinformationfromproductionoperationandmathematicalandphysicalsimulations,andmeasurestotacklewiththeproblemsarisingfromPCIareproposed.Themainresultsareasfollows.①Duetotheunfavorableconditionsforcokingofcoalinthemelter-gasifier,cokingofchargedlumpycoaltogetsemicokewithgoodsizeandstrengthcanhardlybeexpected.Tomaintainthepermeabilityoftheburdencolumn,apackedbedsimilartoblastfurnaceisnecessary.Therefore,alittlemorecokewithPCIinplaceofmostofthelumpycoalmayimprovetherunningofthereactor.Thiscanalsomakethelumpycoalselectioneasier.②Overallheatbalanceanalysisofthemelter-gasifiershowsthatPCIhasnoeffectonthethermalconditionofthefurnaceasawhole.Localheatbalanceanalysis,however,showsthattheheathofthemelter-gasifierisinacriticalstateoflowheatsupply.PCIintothehearthwilldeterioratethethermalcondition.ToavoidthecoolingofthehearthzonebyPCI,moreoxygencanbeblowntothehearthzone,i.e.increasetheoxygensupplytothehearthanddecreaseaccordinglytheoxygensupplytothefreeboard.Moreoxygensupplytothehearthseemstobringouttheissueofanincreaseinfuelrateand/ortherebythesmeltingintensity.DetailedanalysisofthephysicalchemicalprocessesconcludedthatPCIwithmorecorrespondingoxygensupplywillnotleadtotheincreaseoffuelrate.③Comparingwithblastfurnace,theracewayvolumeofCOREXmelter-gasifierisaboutonly1/10～1/5ofthatofcorresponding-sizeblastfurnace.ThissmallracewayisnotfavorableforPCI.ToenlargetheracewaytogetmorefavorableconditionforPCI,lesstuyereswithmoreoxygensupplyofeachtuyereisproposed.④Comparingwithlumpycoalfeedingintot

简介：Increasingproductioncapacityandoperatingrate,reducingfuelratesandcostsofhotmetal(HM)aretheurgenttasksfortheCOREXprocess.Inthisstudy,thevariousfactorsonthefuelconsumptionofCOREXareresearchedfromthetheoreticalanalysisbasedonthecalculationsofmaterialbalancesandheatbalances.CombinedwiththeproductionperformancesandpracticesofCOREX-2000(Saldanha,India)andCOREX-3000(Baosteel),thetechnicalmeasuresofreducingthefuelrateareanalyzedandthewayforwardoftechnicalinnovationisaddressedanddiscussedwiththestandpointoftheCOREXprocessimprovement.

简介：Thedistributionofreducinggasinashaftfurnacedominatesthetemperatureprofile,gasutilizationratio,metallizationdegreeandistheoverwhelmingfactorforstable,highproductivitiesandlow-energy-consumptionoperation.Atthesametime,thedistributionofgasflowismainlydeterminedbythepositionofgasinlet,thepackedbedporositydistributionaswellasitschangeduetothedifferenceonthemodeoftopchargeandbottomdischarge.Wheninjectingpositionoftheprocessisfixed,thechargemodeistheonlymeansforregulatingthegasflowdistribution.Inthispaper,anumericalsimulationmodelofburdendistributionintheshaftfurnaceofCOREX3000hasbeendevelopedtoanalyzetheporositydistributionunderthedifferentchargemodesbymeansofDiscreteElementMethod(DEM).Theeffectsoftheparticlesizeanditsdistributionunderconditionsofdifferentchargebatches,chuteangle,stokelineontheburdensurfaceshapeandburdenbedparticlesizedistributionandsegregationwereinvestigated,andthentheporositydistributionintheshaftofcorrespondingchargingpatternwasquantitativelyaccessed.Therefore,theresultscanbeusedtooptimizethechargepatternsbaseonrequiredgasdistribution.

简介：TheCOREXprocessisauniqueindustrializedsmeltingreductiontechnologyforiron-makingpresentlyintheworld.Oneofitsstrikingcharacteristicsisitsabilitytodirectlyutilizelumpcoalasitsmainfuel.Therefore,theCOREXprocessuseslittle,ornocokeatall.TherequirementsonlumpcoalfortheCOREXprocessweregiveninthispaper.Inordertoreducethecokeconsumptionandgiveplaytotheadvantagesofdirectlyusinglumpcoal,theappropriateratioofcoketolumpcoalneedstobedetermined.Thispaperalsosummerizedseveraladvancedmethodsofusingpowderedcoalgeneratedbythetransporting,loadingandunloadingoflumpcoal.InordertosolvethelackofcoaltypesforCOREXandobservethecrackinganddevolatilizationactionoflumpcoalinthemelter-gasifier,anexperimentaldeviceandanewmethodwereproposedtotestthecrackinganddevolatilizationcharacteristicsoflumpcoal.Bymeansofthenewmethod,thedevolatilizationandcrackingbehaviorsoflumpcoalcanbeinvestigated,whichishelpfultotheselectionoflumpcoalfortheCOREXprocess.

简介：摘要本文首先对八钢COREX炉竖炉探尺控制系统Profibus-DP网络现状进行了描述，提出改造优化的必要性，并对现用控制网络结构进行了深入的分析。然后根据控制系统网络结构的实际需求，结合分析的结果，对八钢COREX炉竖炉探尺控制系统Profibus-DP网络提出了改造优化方案，并在充分利用现有的网络资源的基础上，对八钢COREX炉竖炉探尺控制系统Profibus-DP网络进行网络改造优化设计与实施。改造优化之后的八钢COREX炉竖炉探尺系统Profibus-DP控制网络完全满足现场工艺、设备使用条件，并且控制网络运行更加安全稳定可靠、便于维护。

简介：摘要本文首先对八钢COREX炉竖炉探尺控制系统Profibus-DP网络现状进行了描述，提出改造优化的必要性，并对现用控制网络结构进行了深入的分析。然后根据控制系统网络结构的实际需求，结合分析的结果，对八钢COREX炉竖炉探尺控制系统Profibus-DP网络提出了改造优化方案，并在充分利用现有的网络资源的基础上，对八钢COREX炉竖炉探尺控制系统Profibus-DP网络进行网络改造优化设计与实施。改造优化之后的八钢COREX炉竖炉探尺系统Profibus-DP控制网络完全满足现场工艺、设备使用条件，并且控制网络运行更加安全稳定可靠、便于维护。

简介：摘要本文详细介绍了采用全数字交流变频矢量控制系统实现八钢1#COREX炉竖炉炉顶机械探尺自动控制系统的思路和方法，给出了系统的硬件设计。使用结果表明该系统运行稳定、可靠，可以很准确地测量竖炉料面。