# Long-Term Performance Attenuation Trend Prediction Model of Four Anti-Corrosion Heating Tubes in Fermentation Environment ## Attenuation Prediction Model for 316L Stainless Steel Heating Tubes Core attenuation driving factors: Chloride ion concentration in medium, maximum temperature of alkaline cleaning fluid, annual continuous operation hours, thickness of accumulated organic scale, wall thickness loss caused by weld pitting corrosion. Model calculation logic: Take medium chloride content and alkali washing temperature as primary weighting coefficients. When chloride exceeds 50ppm or alkali temperature exceeds 60℃, the annual wall thickness attenuation rate rises exponentially. The aging℃of passive film is calculated based on cumulative pickling and passivation times every year, and the thermal resistance growth value is derived from real-time heating power deviation to judge scale accumulation thickness. Stage-by-stage performance attenuation law 1. Initial stage (0–12 months): Uniform intact passive film, stable heat transfer efficiency, no obvious rust spots, minor power fluctuation within 5%. 2. Medium aging stage (12–24 months): Local shallow pitting appears at welds, passive film partially damaged, heating power rises by 10%–18%, slight rust shedding risk during CIP flushing. 3. Failure early warning stage (24–36 months): Deep penetrating pitting expands, wall thickness attenuation exceeds 15%, thermal resistance surges, frequent rust block shedding, leakage risk reaches critical level requiring planned replacement. Key early warning thresholds: Wall thickness attenuation ratio ≥10%, heating power increase ≥15%, medium chloride average concentration >50ppm rau peb pawg sib law liag. ## Attenuation Prediction Model for Ntshiab Titanium Heating Tubes Core attenuation driving factors: Trace fluoride residue in medium, cumulative scratch coverage area on tube surface, dissolved oxygen content of cleaning circulating water, galvanic corrosion sediment deposition time, txhua xyoo ua haujlwm tag nrho. Cov qauv kev suav cov logic: Cov ntsiab lus fluoride ion yog teem raws li qhov hnyav txaus ntshai; ib qho tshuaj fluoride tuaj yeem ua kom nrawm nrawm ntawm lub raj phab ntsa thinning. Qhov saum npoo muaj peev xwm tus nqi yog siv los ua kom muaj nuj nqis ntawm cov yeeb yaj kiab passivation kev ntseeg siab, thiab cov pa oxygen tsawg hauv cov dej ntxuav tau nce txhua xyoo attenuation coefficient los ntawm 2-3 zaug. Kos thaj tsam piv ncaj qha cuam tshuam rau ion nag lossis daus coefficient. Theem-los ntawm-theem kev ua tau zoo attenuation txoj cai 1. Kev ua haujlwm ruaj khov theem (0–36 lub hlis): Ua kom tiav kev cog lus TiO₂ passivation zaj duab xis, ruaj khov thaum tshav kub kub hloov efficiency, tsis muaj mis nyuj dawb etching kab, cua sov fais fab hloov qis dua 6%. 2. Slow aging theem (36–60cc lub hlis): kev ua kom muaj peev xwm rov ua dua, los yog rov ua dua tshiab passivation zaj duab xis kev ua tau zoo, cua sov efficiency poob qis dua 10%. 3. Hloov kev ceeb toom theem (tshaj 60 lub hlis): Loj- thaj tsam sib sib zog nqus khawb los yog ntev- lub sij hawm fluoride hu ua irreversible tej zaum yuav txo tau, passivation zaj duab xis nws tus kheej- kho muaj peev xwm ploj, uniform phab ntsa batch hloov tshwm sim, pom zoo batch hloov. Cov lus ceeb toom tseem ceeb thaum ntxov: Tube nto electrochemical muaj peev xwm txuas ntxiv qis dua tus qauv, kos thaj tsam loj dua lossis sib npaug li 20%, kuaj pom cov tshuaj fluoride ions hauv nruab nrab pub mis. ## Attenuation Prediction Model for Quartz Anti-Corrosion Heating Tubes Core attenuation driving factors: Lub sij hawm ntawm kev sib tsoo alkali cawv tiv tauj, kub nce tus nqi thaum pib, kev vibration siv ntawm lub raj ntim kev txhawb nqa, cumulative thermal shock zaus, txhua xyoo lub teeb kis tau tus mob tawg nrawm. Cov qauv kev suav cov logic: Txhua qhov kev sib cuag alkali ua rau qhov chaw ruaj khov frosting poob coefficient; kub nce ceev tshaj 0.5℃/ min thiab muaj zog vibration ob leeg leeb microcrack expansion linearly. Qhov sib piv ntawm frosting kev pab them nqi thiab microcrack ntev yog ua ke los xam tag nrho cov qauv attenuation degree. Theem-los ntawm-theem kev ua tau zoo attenuation txoj cai 1. Cov theem ruaj khov tshiab (0–6 lub hlis): Cov pob tshab du du, tsis muaj microcracks, ruaj khov qis- lub zog cua sov tso tawm, tsis muaj qhov txawv txav kev co teb. 2. Thaum tshav kub kub tsub zuj zuj theem (6–18 lub hlis): Cov xov me me ntawm lub teeb pom kev sib koom ua ke Kev ua haujlwm tsis zoo nrog alkali, kev ua haujlwm cua sov poob qis me ntsis vim yog cov av adhesion. 3. Qhov tseem ceeb tsis ua haujlwm theem (tshaj li 18 lub hlis): Microcracks txuas mus rau hauv cov kab nrib pleb, frosting npog ntau dua 30% nto, thermal shock lossis me ntsis vibration yooj yim ua rau lub raj tawg, ua rau cov khoom tsis zoo. Cov lus ceeb toom tseem ceeb thaum ntxov: Pom pom microcracks pom los ntawm lub teeb kis tau tus mob, kev tiv thaiv frosting Ntau dua lossis sib npaug li 30%, ntau tshaj li ib qho dej cawv ua haujlwm tsis zoo hauv ib nrab xyoo. ## Attenuation Prediction Model for PFA Coated Heaters Core attenuation driving factors: Txhua xyoo cumulative over-kub lub sij hawm ua hauj lwm, concentration ntawm hard abrasive hais nyob rau hauv nruab nrab, ntau zaus ntawm siab -concentration oxidant tshuaj tua kab mob, lub sij hawm ntawm ceev ceev txias-kub expansion co.blister tom qab ntxuav Cov qauv kev suav cov logic: Kev ua haujlwm kub siab tshaj 95℃daim ntawv exponential aging coefficient rau fluoroplastic txheej; nyuaj particle scouring qhov tob txiav txim siab khawb nkag qhov tshwm sim. Txhua lub voj voog ceev ceev ua rau muaj kev ntxhov siab hauv txheej txheej thiab ua kom lub ntsej muag hlwv. Theem-los ntawm-theem kev ua tau zoo attenuation txoj cai 1. Thawj theem ruaj khov (0-9 lub hlis): Cov txheej txheem zoo li qub tsis muaj hlwv, ruaj khov thermal ua rau ruaj khov 10%–20% kev siv hluav taws xob ntxiv, tsis muaj qhov muag daj . 2. Txheej aging theem (9-18 lub hlis): Lub zog me me tshwm sim, cov xim daj tuaj yeem tshwm sim, cov kab mob hauv zos thiab cov tsos mob tshwm sim. nce los ntawm ntau dua 20%, cov tshuaj fluorine me me-muaj cov hmoov zoo ua rau muaj kev pheej hmoo. 3. Ua tiav theem tsis ua tiav (tshaj li 18 lub hlis): Kev khawb khawb ua rau cov pa roj carbon steel substrate, loj- thaj tsam txheej txheej, sab hauv substrate rust blocks poob tawm, yas micro-cov khoom siv tsis zoo yog qhov nruab nrab, tsis muaj qhov cuam tshuam loj. Cov lus ceeb toom tseem ceeb thaum ntxov: Cov pob khaus thiab khawb qhov puas tsuaj ntau dua lossis sib npaug li 5% ntawm tag nrho cov txheej txheej, txuas mus ntev -lub sijhawm ua haujlwm kub tshaj 95 degree, pom tseeb daj brittleness ntawm txheej txheej. ## Daim Ntawv Thov Kev Cai ntawm Kev Ntsuas Kev Ntsuas Tus Qauv 1. Cov ntaub ntawv tawm tswv yim: Txhua tus qauv tsav tsheb tsis tau muab los ntawm kev saib xyuas online tiag tiag-cov ntaub ntawv sijhawm, cov ntaub ntawv saib xyuas txhua hnub thiab cov ntaub ntawv tshawb xyuas offline ib ntus, kom ntseeg tau tias kev twv ua qhov tseeb thiab traceability. 2. Dynamic parameter qhov nruab nrab ntawm kev hloov kho qhov nruab nrab: formula, ntau lawm load thiab tu cov txheej txheem hloov mus txhim kho kev kwv yees qhov tseeb. 3. Cov khoom siv kev sib txuas: Tsis siv neeg thawb lub hom phiaj kev saib xyuas raws li cov qauv attenuation theem tshwm sim; Ntxiv dag zog rau kev soj ntsuam zaus rau cov cuab yeej nkag mus rau theem nrab laus, thiab tsim cov phiaj xwm hloov ua ntej rau cov chav mus txog qhov kev ceeb toom ntxov ntxov. 4. Kev taw qhia kev ua kom zoo tshaj plaws: Ua kom zoo rau kev ua haujlwm xws li chloride tswj, alkali kub txwv, cua sov tus nqi thiab kev ua kom txias txias raws li qhov ntev - lub sij hawm attenuation kev pab cuam lub neej ua haujlwm qeeb. ## Cov ntsiab lus plaub hom cua sov raj muaj qhov sib txawv ntawm cov txheej txheem attenuation thiab kev ua haujlwm hloov pauv tau txiav txim siab los ntawm cov khoom siv hauv lub cev. Stainless hlau attenuation yog dominated los ntawm chloride pitting thiab siab -kub alkali kev puas tsuaj nrog rau 2-3 xyoo tsis ua hauj lwm voj voog; titanium ntshiab tso siab rau cov yeeb yaj kiab ruaj khov nyob rau hauv fluoride-dawb tej yam kev mob kom ua tiav 4-5 xyoo kev pab cuam lub neej nrog qeeb attenuation; quartz iav accumulates microcracks thiab frosting kev puas tsuaj nyob rau hauv thermal shock thiab alkali misoperation, nrog ib tug luv luv kev ruaj ntseg lub sij hawm tsawg tshaj li 18 lub hlis; PFA txheej raug kev txom nyem irreversible siab - kub aging thiab abrasive khawb puas,
