酸性气干法制硫酸工艺应用Acid gas drying process sulfuric acid application.docx
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酸性气干法制硫酸工艺应用Acid gas drying process sulfuric acid application.docx
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酸性气干法制硫酸工艺应用Acidgasdryingprocesssulfuricacidapplication
酸性气干法制硫酸工艺应用(Acidgasdryingprocess,sulfuricacid,application)
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Petrochemicalenvironmentalprotection,ENVIRONMENTAL,PROTECTION,IN,PETROCHEMICAL,INDUSTRY
2006volumesecond,issuetwenty-ninth
Acidgasdryingprocess,sulfuricacid,application
FengFengquan1,YaoXuelong2
(1.ChinaPetroleumChemicalCoJingmenbranch,HubeiJingmen448039;2.SinopecNanhuaDesignInstitute,JiangsuNanjing210048)
pick
Theprocessdesignfeatures,start-upandoperationofsulphuricacidplantwith50kt/AaciddrygasprocessinJingmenbranchareintroduced:
Problemsandsolutions.Sourgas;acid;device;characteristicsofrawmaterials;designandoperationkeywords:
SinopecCorporationJingmenbranchof50kt/asulfuricacidplantistoexhaustintheprocessofpetroleumacidgasasrawmaterial,isthefirstlargedryhydrogensulfideacidplant,atotalinvestmentof39millionyuan.ThedevicebytheDesignInstituteofNanhuaandChinaPetroleumChemicalCothroughthereview,undertakenbyJingmenpetrochemicalconstructioncompany,thekeyequipmentofacidbyprofessionalmanufacturers7,July2004tocompletethefinaldeliveryandreadytostartinthe27month,onceadaytodrivethesuccessoffeeding.Thecar,openedupanewwayforthetreatmentofacidgasproductioninpetrochemicalindustryintheprocessofpetroleumgasgovernance,tosolvetheJingmenbranchofthesulfurrecoveryunitforalongtimethesulfurrecoveryrateislow,theenvironmentalpollutionproblems.Thefirsthalfof2005unitoperahonbutbecauseofthepresenceofsomeequipment,141days,93%productionofacid12KT,eachweekonaringoftimetoreachthenationalemissionmonitoring,theaveragesulfurdioxidecontaining622mg/m3,Paultwogradedischargestandard.1thecompositionandcharacteristicsofsourgasinrefinery,becausehydrogensulfideisanacidgas,sothemixedgascontaininghydrogensulfideiscalledsourgasinrefinery.Itscompositionandcharacteristicsareshownintable1:
Table1components,%V)(normalvaluesforacidgascompositiondata)(CO2,20~30,NH3,<1,hydrocarbon,<1,H2,S,60~70)
(2)theconcentrationofacidgasisunstable.Becauseofthedifferentconcentrationofdifferenthydrogensulfidedesulfurizationdevice,coupledwiththechangeofoperatingconditions,thehydrogensulfideconcentrationisusuallyavariation,normallycontaininghydrogensulfideis60%~70%,40%~80%fluctuationsinthenonnormal.(3)theflowofacidgasisunstable.Becausetheacidgaswithliquidistransportedthroughlongdistancepipeline,theliquidsealisformedatthelowpoint.(4)easytocarryhydrocarbon.Undernormalcircumstances,theacidgascontaininghydrocarbonbutnotmorethan1%bodies)inrefineryoperationisnotstablewhencontaininglargeamountsofhydrocarbons(3%,sometimeshigher)atonceintothefurnaceburning(,producealotofheatinthefurnacetemperatureandconsumelargeamountsofoxygenandhydrogensulfideunderanoxicconditionseasytoproduceClausreactionofsulfur,blockingthecoolingtowernozzle,influenceofelectricdemister'snormaloperation,theprocessofgaspurificationsectionoftemperatureandwatercontentdoesnotmeetthetechnologicalrequirements.(5)easytocarryammonia.Becausetheliquidhydrocarbondesulfurizationagentistwoethanolammoniasourwaterstrippingammoniadesulfurizationinrawmaterials,intheacidgasdeviceoperatingundertheconditionofunbalancediseasywithammonia,andammonianitrogenoxidedissolvedindilutesulfuricacid,thatisincreasedbydilutesulfuricacidcomponentcomplexityandcorrosionresistancethepipelineofequipment.(6)therawmaterialgashydrogensulfidecontainstwohydrogenatoms,whichproduceswatervaporintheprocessofburningandaffectstheacidconcentrationbalance.Therefore,thedryprocessacidisusedtoremovethewaterinthepurificationsection.The2devicecharacteristicsofJingmenbranchandNanhuaInstitutewilldesignseveraldecadesafter
(1)toxic,flammableandexplosive.Hydrogensulfideisacolorless,smellyeggflavor,intensenervetoxicgas,whenhighconcentrationscancauserespiratoryarrestanddeath.Themaximumallowableconcentrationofhydrogensulfideinairis10mg/m3,meltingpointis82.9DEGC,boilingpointispureH2S,and260DEGCisstipulatedbythestate.Itsexplosivepole(point:
60DEGC,limitedto:
3%~45.5%).Four
Receiveddate:
2005-7-19Author:
FengFengquan,engineer.Engagedinenvironmentalprotection,productionandmanagementoftwentymen,formanyyears,istheJingmenbranchofsulfuricacidplantoperatingprocedureswrittenanddevicestartofthe0724-227049613971866187conductor.Contactnumber:
E-mail:
ll19770605@163.com
Secondissue
FengFengcongruent,acidairdryprocess,sulfuricacid,application
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Thesulphuricacidplantisdesignedbycombiningtheconceptsofreducinginvestmentandoccupyinganarea,savingenergy,reducingconsumption,protectingenvironmentandconvenientoperation,andtakingintoaccountthecharacteristicsofhydrogensulfideproducingacid.The2.1devicelatentsulfuracidgasinJingmenPetrochemicalscalein2001amountedto8kt/a(COproductionofsulfuricacidisabout2.5T/a)withtheJingmenbranch,afterseveralyearsofdeepprocessing,increasetheprocessingcapacityofcrudeoilandpetroleumproductqualityindexupgrade,Jingmenbranchofthedesignscaleofsulphuricacidplant50kt/A.2.2usingtwoprocess"twodry3+1acidmethod"fourtransformationandefficientmodelS108M)(catalyst,improvetheutilizationrateofsulfur,thetotalconversionrateofmorethan99.6%.Solvethesulfurrecoveryunitforalongtime,lowsulfurrecoveryrateofonly82%)(environmentalpollutionproblems).The2.3devicecontrolledratedeviceforimplementingDCScontrolinthebuffertankandtheincineratorinstalledatthehydrogensulfideconcentrationmeasurementalarm,on-sitemonitoringofleakageofhydrogensulfide,andhydrogensulfideconcentrationintheenvironmentintheDCSdisplay,toensurethesafetyofoperatordevice;2guideanalyzerdistributionadjustment;absorptiontoweracidpipelineanodeprotectionSO.Twolevelconverterentrance2.4additionalelectricheatingfurnacefor"dry"acidcatalystonthemoisturecontentintheprocessgasmorestringentrequirements,iftheindividualuseofheatingfurnaceforheatingthecatalyst,one-timeinvestmentisrelativelylarge,afterthestartoftheidleequipment.(usedindesign,onesectionandfoursectionarerespectivelyprovidedwith550kWfivegroup(360)electricheatingfurnacecannotonlysolvetheconstructioninconverterburnkWgroupthree)andbakingcatalysttemperaturerisingproblem,butalsotomeeta42periodofcatalystignitiontemperaturewhenusingelectricheatingremediesintherawmaterialoflowloadcannottosolvetheacidgasconversionsection,hoursofreactionheatproblems,improveequipmentoperationrate.2.5SO2mainfandrivenbysteamturbinestoreducepowerconsumptionduetocorrosionofthemediumpressuresteamboilersandotherequipmenttoproduce3.82MPawasteheatboilerdevice,andthedevicearoundandnosteampipelinenetwork,ifamediumpressuresteampipelineandthewholeplantis5~8perhourwillbesenttothetsteampipenetwork,long-distancetransportationsteamqualitywilldecline.Forthispurpose,asteamturbineisdesignedtodrivetheSO2fan.Whentheacidgasloadislowandthesteamproducedisless,theSO2fandrivenbythemotorcanbedrivenwhenthesteamturbineisnotdriven,andthesteamproducedbythedeviceisreducedto1MPabyusingatemperaturereducingandreducingdeviceandisfedintothepipenetwork.Thus,whentheunitloadislarge,thesteamdrivestheSO2windfunctiontoreducetheenergyconsumption,andwhenthedeviceisloaded,thesteamhasaplacetogo,sothattheflexibilitycanbeseen.
2.6
Acomplementaryheatexchangeprocessisadopted,andthethirdandfourthsectionsoftheoutletheatarecrossedandcomplementary
Coldgasconverterfirstandfourthsections,thesectionsofconverterinlettemperatureandconversionrateofeachsegmentselectionandselectionofgasabsorptiontowerisindependentofthetemperature,optimizationandtransformationsystemtotheinlettemperatureoftherelativelyindependent,transformationsysteminaccordancewiththecatalystloadingquantity,thetotalconversionrateismaximumortheimplementationofoptimizationthetruesenseofthetotalconversionrateofminimalimpactetc.,andtwoabsorptiontowergastemperaturecanbecombinedunderthesameconditions,inaccordancewiththeminimumtotalheattransferarea,themostsuitableadjustmentoftheheatexchangesystemofinletairtemperature,
[1]optimalallocationcanbecarriedoutoptimally.
33.1
Theproductionprincipleandprocessequipment,productionprinciple,theacidgasintakeincineratorcontainingH2andSandthecombustionofairareproduced
SO2containinggas,cooling,washin
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