英译汉英文材料.docx

英译汉英文材料.docx

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英译汉英文材料

160tConverterofJSPLSteelandIronCompanyinIndia

1.Gascleaning,ventilatingandair-conditioning

1.1Outline

Themainprocessequipmentsofsteel-makingsystemaretwoconverterof160t,twoladleof160t,tworailtankdesulphurizationstations,onefurnaceof160tVD,andcorrespondingauxiliaryfacilitiesofpublic.

Thedesignsetthecorrespondinggascleaningandventilation,air-conditioningfacilities,accordingtotheprocessrequirement.Inordertomeetthetechnologicalrequirementsofproductionandhumanhealth,preventenvironmentpollution.Gascleaningandventilation,air-conditioningfacilitiesmainlycomprise:

（1）Initialgaspurifiesandgasrecoverysystemofconverter

（2）Secondstategaspurifyofconverter

（3）FlueGasCleaningSystemofhotmetalfoldingtank；

（4）Gascleaningsystemindesulphurizationstations

（5）Gascleaningsysteminrefiningfurnace（incl.fluxandferroalloyloadingdustcleaningsystem）

（6）Ventilatingandair-conditioninginpublicfacilities.

1.2Firstde-dustingandgasrecoverysystemofconverter

Infirstde-dustingandgasrecoverysystemofconverter,wedesigntwoprograms,girthwetdustcleaningsystemandLTdryelectricitydustcleaningsystem.Volumegasrecovery>90m3（standardcondition）

1）Thetechnicaldataoftheconverter

（1）Nominalcapacity160t

（2）Theaveragerefiningcycleconverter45minonce

（3）Maximumrateofcarbonreduction0.48%/min

（4）Carboncontentinmolteniron4.0-4.2%

（5）Carboncontentinmoltensteel0.04-0.1%

（6）Temperatureoffurnacegas~1500℃

（7）Theoriginalvolumeoffurnacegas97440m3/h（standardcondition）

（8）Concentrationofdust~120g/m3（standardcondition）

2）Processofdustcleaningsystem（wetdustcleaningprogram）

Thetemperatureofinitialwastegaswillgodownto900℃afterpassingthroughcoolingflue.Gasgoesintothesprayscrubberthroughtheswirlingwaterseal,Aftergoingthroughthesprayscrubber,dustover5micronsinthegaswillattachtothebasicwaterspray,Undertheactionofgravity,integratedwashingdustwatersettlesatlowestplaceinthebottomofthetowerandreachescirculatingwatertreatmentstationthroughawatersealdevice,thepipelineandturbidwatertank

Throughthesprayscrubber,thetemperatureofgaswilldecreasefrom900℃tosaturationtemperature75℃,efficiencyofdustcollectionreach97%.Thesaturategaswillenterannulargapscrubberthroughconnectingpipe.

Theannualtapscrubberprovidesadjustablegirththroat,themicro-pressuredifferenceinsideandoutsidethemouthcantranslateintheelectricsignalbythedifferentialpressuretransmitter.Ledbyadjustingthehydraulicactuatorunitaction,drivewithintheventuritubeupanddownmovementwithinthecone,thetemperatureofwastegasinannualtapdecrease7℃,andtheoutlettemperatureis68℃.

Theannualtapscrubberisdualthroat,andworkflowratestabilizedat80-100m/s.theminimumdesignvelocityis60m/s,whilethemaximumdesignflowrateis120m/s,diameterofdropletsisbetweentwenty-fiveandseventymicrons,dustremovalefficiencycanreach98~99.9%.

Aftertreatment,concentrationoffluegasemissionwillbe<50mg/m3（standardconditions）.

Afterairwithwaterdropletsentersthe90obendevaporator,duetothesubjectofinertiaandcentrifugaleffect,Waterdropletsleftbehindtothevaneofevaporatorandwallofthedeviceandshedalongthewall,atthelowestpointthroughthepipeline,watersealdeviceanddrainagetrap,thedropletsreachthecirculatingwatertankstation.

Inordertoachievebetterdewateringeffect,behindthe90obendevaporatorthere-establishmentofacycloneevaporatorisinstalledtofurtherseparateddropletsfromthefluegas.Waterdropletsundertheactionofcentrifugalforceisseparatedandcollectedintheinnerwallofthecontainer.Aftercollectingthewateratthebottomofthelowestpointinthecone,itwillreachcirculatingwatertankstationthroughpipeline,watersealanddrainagetrap.

Fanofwastegascleaningsystemisdoublesupport,doubleinlet,singleoutletturbinegasblowerswithautomaticspraycleaningimpellerwashsystem.

Theairflowofthefanis210000m3/h,thepressureisbetween23000Paand26000Pa.Theequippedmotoradoptfrequencycontroltoachieveenergysaving.

Afterthefan,weequippedacoalgasconverterstation,aemergencyreliefvalve,awatersealcheckvalveandaV-shapedwaterseal.

InthesystemMicro-elementsoxygenandCOcontinuousautomaticanalyzersareprovidedandchainwithswitchingstation,inorderthatcoalgasrecoveryandelutionconvertautomatically.Whenthegasrecoveryconditionmeets,convertthevalvetorecoverystate,atthattimetheconvertergastransportstogastankthroughthewatersealcheckvalve;whentheconditionisnotsatisfied,convertthevalvetoelutionstate,theconvertergasexhaustsbythesixtymetershighchimney,whiletheignitionofthecokeovengaselectromagneticvalveopens,theignitiondeviceigniteovengasburnerautomatically,sothecoalgasdrainfromthechimneygetburned.Twominuteslater,theignitionofthecokeovengaselectromagneticvalveclosesautomatically.Whentheswitchingstationconverttorecoverystateagain,thesteamautomaticpurgedeviceinthebottomofbleedingchimneystartup,andshutdownautomaticallyafterapurgeofabouttwominutes.

Upstreamofgasswitchingstation,abypassvalveisinstalled.Iftheswitchingstationfailures,thebypassvalveopens,convertergaswilldiffusethroughbleedingchimney.

Thesystemequippedwithonlinetemperature,pressure,vibrationtestingandcontrolsystems,controlledbyPLC,whichhasman-machineinterface.

Themainequipments（eachconvertersetupagaspurificationsystem,eachsetofsystemshowsasfollows）:

（1）Sprayscrubberoneset

（2）Annualtapscrubberoneset

（3）90obendevaporatoroneset

（4）Cycloneevaporatoroneset

（5）Coalgasevaporatoroneset

（6）Watersealcheckvalveoneset

（7）V-shapewatervalveoneset

（8）Gasbloweroneset

（9）RiotFrequencyconversionmotoroneset

（10）Overflowwatersealingholderthreesets

（11）Maintenancecraneof20toneset

3）.Processofde-dustingsystem（dryde-dustingprogram）

Forfirstgaspurificationandrecoverysystem,eachconvertersetsuponeset（thefollowingdescriptioniswrittenforoneset）.ConvertergaspurificationandgasrecoverysystemusestheLTdryprogramforcleaningandrecycling.Thefurnacegasmixwithasmallamountofairathoodmouth,burningcoefficientα=10%,aftercooledbythecoolingflue,itcomesintothepurificationandrecoverysystem.TheLTdryprogramdevicemainlycomprisesgascoolingsystem,gaspurifyingandashconveyingsystem,Safetycontrolsystemandotherancillaryequipment.ThepurificationequipmentmainlyconsistsoffourelectricfieldroundESP,fluegasdustcontentafterpurificationwaslessthan15mg/m3（standardconditions）.

Themainfunctionforequipmentsoffirstgaspurificationandrecoverysystemisshowedasfollows（eachconvertersetsupagaspurificationandrecoverysystem,thefollowingdescriptioniswrittenforoneset）:

（1）Evaporativecooler

Evaporativecoolerisdirectcoolinggasequipment,whichadoublenozzlemediumsprayissetatthetopofthecoolerforfinesprayofwater;theamountofwaterisadjustedaccordingtothehotairexhaustenthalpy.Aftertheprocedure,temperatureofwastegaswillgodownto180℃,anddustconcentrationofwastegasdecreasesabout40%

（2）Dryelectrostaticprecipitator

Aftercooledbyevaporatorcooler,theconverterwastegasentersdryelectrostaticprecipitator.Inorderthatthedryelectrostaticprecipitatorhasbetterexplosion-proofabilityandaerodynamiccharacteristics,itsshellisdesignedtocylindrical,inthecaseofconvertergasexplosion,inordertoensuresafetyofequipment,therearefourscalableexplosionventingandautomaticresetofthesafetyvalveintheelectrostaticprecipitatorinletandoutletoftheconeparts.Fourdryelectrostaticprecipitatorsensurethatgasdustconcentrationcanbelessthan20mg/m3（standardcondition）aftertreatingbydryelectrostaticprecipitatorwithfourfields.

ProcessDesignoftheElectricDustCatcherofConverterGasSystem

Thedustcontentintheconvertergascomingoutofgasholderwillbeashighas～l00mg/m3,whichcannotusedinthesteelmakingandrollingsystem.Inordertomeettherequirementofconsumers,purificationwillbedesignedforconvertergastoreducethedustcontenttol0mg/m3orbelow.

Themaximumdeliveryflowoftheconvertergasrecoverysystemis～43000m3/h,sotwo60000m3/hplate-typeelectricdustcatcherswillbedesigned.

Theelectricdustcatcherswillbelocatedbetweengasholderoutletandbooster,i.e.theconvertergascomingoutofgasholderwillbesenttoelectricdustcatchersthroughΦ1620x8.Beforeenteringelectricdustcatchers,theconvertergasshouldpassDN1600butterflyvalveandgogglevalve.Convertergaspurifiedintheelectricdustcatcherswillgothroughgogglevalveandelectricbutterflyvalvebeforeenteringboostingsystem.

Controloftheelectricdustcatcherswillberealizedthroughcomputersinstalledincontrolroom.Inordertocleanelectricdustcatchers,continuousandintermittentwaterspraysystemwillbedesignedfortheelectricdustcatchers.

Inordertoachieveautomaticcontroloftheelectricdustcatchers,automaticprocessdetectionsystemwillbeprovidedtoprovidesuchcontrolfunctionsassparkfrequencytracking,peakvalvetracking,intermittentdischargeandetc.,soastoadjustproductionprocessintermittently,hencetooptimizetheworkingconditionofequipment.

Inordertoassuresafeoperationofele