Cov ntsiab lus oxygen yaj puas txiav txim siab tus kheej li cas - kho kev ua haujlwm ntawm titanium passivation zaj duab xis?

# Tus kheej li cas - kho qhov ua tau zoo ntawm titanium passivation zaj duab xis nyob ntawm cov ntsiab lus oxygen yaj? Txhawm rau tiv thaiv chloride corrosion hauv fermentation media, Qib 2 ntshiab titanium cua sov raj yog nyob ntawm nyias TiO₂ zaj duab xis passivation. Cov khoom siv tseem ceeb rau tus kheej tsis tu ncua- kho cov yeeb yaj kiab tiv thaiv no yog yaj cov pa oxygen hauv cov dej huv huv. Me me khawb thiab etching me ntsis ntawm lub raj saum npoo yuav tsis tuaj yeem rov qab los vim tsis txaus cov pa oxygen, uas ua rau maj mam loj hlob ntawm - thaj tsam milky dawb corrosion txheej. Cov lus hauv qab no qhia txog kev sib raug zoo ntawm kev kho cov yeeb yaj kiab passivation thiab cov pa oxygen concentration hauv cov txheej txheem CIP ntxuav.|Ntshav Qab Zib Qib|TiO₂ Zaj duab xis Kho Ceev|Deg mob ntawm Titanium Tube|Corrosion Risk Level|Txheem CIP Kev Ua Haujlwm Hloov Kho|| -{{20}--|----|-{{41}--|----|----|| Hauv qab no 4 mg/L|Yuav luag tsis muaj peev xwm kho tus kheej|Fint discoloration, kos cov cim nyob ruaj khov|Kev pheej hmoo siab|Pib ywj siab aeration twj tso kua mis rau tag nrho lub voj voog tu|| 4–7 mg/L|Kev kho tsis tiav qeeb|Nthuav etching chaw nyob tom qab ntxuav|Kev pheej hmoo nruab nrab|Txuas lub sij hawm aeration los ntawm 15 feeb ib CIP batch|| 8–12 mg/L|Ceev ceev kho tus kheej|Smooth uniform zaj duab xis, tsis muaj residual khawb|Tsawg pheej hmoo|Khaws cov khoom siv aeration uas twb muaj lawm|| Tshaj 12 mg/L|ruaj khov ultra-ceev kho|Nthuav thickened tiv thaiv zaj duab xis, muaj zog tiv thaiv chloride kev ua tau zoo|Kev pheej hmoo tsis zoo|Khaws tam sim no aeration yam tsis muaj kev hloov kho ntxiv|Kev kho tus kheej ntawm titanium passivation zaj duab xis tso siab rau cov tshuaj electrochemical oxidation ntawm titanium hlau thiab cov dej uas muaj oxygen. Tshaj tawm cov titanium tshiab hlau yuav ua ke nrog cov pa oxygen thiab dej molecules los tsim cov titanium dioxide tshiab, sau cov cheeb tsam puas thiab rov tsim kho ib qho kev tiv thaiv corrosion tsis tu ncua, thaum lub raj nto yog khawb los ntawm cov khoom siv los yog me ntsis etched los ntawm kab chloride. Yog tias cov pa oxygen yaj tsis txaus thaum lub sij hawm CIP ncig, cov tshuaj tiv thaiv tsis tuaj yeem ua tiav raws li qhov xav tau, thiab kev tiv thaiv ntawm qhov chaw puas lawm. Cov hlau substrates yuav raug irreversible uniform thinning li chloride ions txuas ntxiv infiltrate lawv. Kev sib txuas ntawm titanium cua sov raj thiab cov tshuab aeration feem ntau tsis pom zoo hauv kev cob qhia fermentation. Cov neeg ua haujlwm nquag lov tes taw aeration twj thaum lub sij hawm CIP ntxuav lub sij hawm kom txo tau lub hwj chim noj, uas ua rau ib tug ceev ceev ntawm yaj nyob rau hauv cov pa oxygen hauv qab 4 mg / L. Txawm hais tias muaj kev sib cais tag nrho ntawm kev sib kis ntawm cov tshuaj fluoride, qhov tsis muaj cov pa oxygen tseem yuav ua rau cov xim tsis zoo thiab corrosion nyob rau hauv peb lub hlis. Kev poob qis tsis tu ncua ntawm cov khoom siv hluav taws xob hluav taws xob muaj peev xwm ntawm cov khoom siv hauv lub raj yuav tshwm sim los ntawm kev ua haujlwm mus sij hawm ntev hauv cov pa oxygen tsawg. Qhov tshwm sim no tuaj yeem pom tau yooj yim thaum lub sij hawm peb lub hlis twg tag nrho-dog qhov chaw kuaj xyuas. Ib qho kev ua haujlwm yuav tsum tau ua rau cov kab ntau lawm nrog cov tshuaj chloride siab nruab nrab yog qhov tsis tu ncua cov pa oxygen ntau tshaj 8 mg / L. Txhawm rau kom ntseeg tau tias cov ntawv nyeem hauv lub sijhawm tiag tiag, cov kws tshaj lij cov cuab yeej siv yuav tsum ntsuas cov ntsuas oxygen yaj hauv ib hlis. Yog tias cov pa oxygen tsis txaus vim kev laus ntawm cov khoom siv aeration, nws yog ib qho tsim nyog yuav tsum tau hloov tam sim ntawd lub aeration nozzles thiab ua kom cov kev khiav. Ua ntej rov pib fermentation, ua 30-feeb oxygen-nplua nuj dej ncig tom qab txhua qhov txuas txuas ntxiv kom rov ua tiav cov yeeb yaj kiab passivation uas tau raug puas tsuaj thaum lub sijhawm cia. Nyob rau lub sijhawm ntev, qhov muaj txiaj ntsig los tiv thaiv corrosion ntawm titanium raj tuaj yeem ua tiav, qhov zaus ntawm offline txhim kho passivation txij nkawm tuaj yeem raug txo, thiab tus nqi ntawm cov cuab yeej siv dav dav tuaj yeem raug txo los ntawm kev tswj xyuas nruj ntawm cov ntsuas cov pa oxygen.