Cov txheej txheem kev ua haujlwm tshwj xeeb rau CIP acid-puag hloov kho ntawm titanium cua sov raj hauv fermentation tso tsheb hlau luam

Cov txheej txheem ua kom tsis muaj menyuam thiab tshem tawm cov khoom noj khoom haus thiab tshuaj fermentation yog CIP online acid-base alternating cleansing. Nto thinning, microcracks, thiab hauv zos pitting corrosion yuav nrawm los ntawm kev puas tsuaj tas mus li ntawm titanium dioxide passive zaj duab xis ntawm titanium cua sov raj vim qhov kev tu tsis raug, kua mis, thiab kev ua haujlwm ua ntu zus. Txhawm rau tiv thaiv kev tiv thaiv kev tiv thaiv -corrosion barrier ntawm titanium raj thaum lub sij hawm tu txhua hnub, qhov kev qhia tshwj xeeb no tsim cov qauv kev tu cov kua dej, qhov kub thiab txias, lub sij hawm ncig, hloov kev hloov pauv, thiab kev txwv tsis pub ua haujlwm.

1. Kev faib tawm ntawm cov txheej txheem CIP ntxuav cov kua thiab cov kev txwv sib xws rau titanium
Alkaline ntxuav kua (rau tshem tawm cov roj organic, qab zib, thiab carbon deposits)
Cov qauv qauv yog cov kua dej ntawm cov zaub mov -qib sodium hydroxide uas muaj li ntawm 3% mus rau 5%. Kev txwv ntawm kev ua haujlwm uas tuaj yeem tswj tau:

Qhov kub thiab txias: 40℃txog 60 degree

Lub Sij Hawm Ib Leeg Lub Sijhawm Soj Ntsuam: 2-4 teev. Tso cai mechanism: Cov txheej txheej xoob ntawm TiO₂ zaj duab xis tsuas yog yaj los ntawm cov alkali me me. Cov txheej oxide ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom ntom txheej txheej sab hauv oxide tseem tsis cuam tshuam thiab tuaj yeem rov qab los ntawm oxygen- cov dej nplua nuj passivation tom qab ntxuav. Forbidden alkaline tej yam kev mob muaj xws li ib tug concentration ntawm 10%, ib tug kub ntawm 80 degree, thiab nruam immersion rau ib lub sij hawm ntawm 6 teev (uas ua rau irreversible uniform matrix etching).

Acid cleansing tov (rau tshem tawm cov calcium magnesium ntsev thiab inorganic mineral scale)
Thawj qhov tseem ceeb: cov kua qaub me me uas muaj citric acid ntawm qhov concentration ntawm 2% mus rau 4%. Cov kev txwv ntawm kev ua haujlwm: Qhov ntsuas kub tsawg kawg ntawm 45 degrees Celsius, lub sijhawm sib xyaw ua ke tsawg dua lossis sib npaug li 2 teev Qhov zoo: Tsis tshua muaj kev pheej hmoo ntawm titanium hydrogen embrittlement vim qhov tsis tshua muaj hydrogen evolution cov tshuaj tiv thaiv. Yog tias qhov loj me xav tau cov kua qaub inorganic (diluted sulfuric / hydrochloric acid, pH ntau dua lossis sib npaug rau 4):

Muab cov tshuaj tiv thaiv corrosion tshwj xeeb tsim rau titanium pickling.

Siv ntau lub voj voog luv luv nrog cov dej ntws tawm ib ntus, tswj qhov ntsuas kub tsawg dua lossis sib npaug li 40 degree, thiab ua ib qho dej tsis ntau tshaj 1 teev.

Yuav tsum tau deionised dej tag nrho cov yaug thiab 120 ~ 150℃ci rau hydrogen tshem tawm tom qab ntxuav. Hydrofluoric acid thiab tshuaj ntxuav uas muaj ammonium fluoride yog nruj me ntsis txwv tsis pub, raws li fluoride tag dissolves titanium passive zaj duab xis.

Cov dej ntws tawm nrog kev hloov pauv nruab nrab
Aerated deionised dej huv (dissolved oxygen Ntau dua lossis sib npaug li 6mg / L) yog tus qauv nruab nrab. Kev Ua Haujlwm: Txhawm rau tiv thaiv kev sib xyaw ncaj qha thiab nrawm pH dhia ntawm lub titanium raj nto, cais cov kua qaub thiab alkali kom txo cov kev sib hloov ntawm cov yeeb yaj kiab yaig.

2. Cov txheej txheem tu ib ntus rau CIP (uas tsis thim rov qab) yog raws li hauv qab no:
Ua ntej- yaug: Rau ib lub sij hawm ntawm 15 feeb, circulate huv si, aerated dej ntawm ib txwm kub kom tshem tawm cov xoob fermentation broth residues los ntawm cov hlab ntsha.

Alkaline ncig tu: Dilute alkali yog ncig ntawm 40-60℃rau 2-4 teev kom decompose organic carbon deposits.

Kev tshem tawm nruab nrab nruab nrab: Lub pH effluent rov qab los rau nruab nrab los ntawm kev txuas ntxiv mus rau dej ntshiab rau 30 feeb, yog li tshem tawm cov alkali seem.

Acid ncig descaling: Inorganic ntxhia nplai yog tshem tawm los ntawm circulating citric acid tov rau 1 mus rau 2 teev.

Kev tshem tawm tag nrho nruab nrab: Circulate tepid, oxygen - dej nplua nuj (40 ~ 50 degree) rau 2 teev kom tshem tawm cov kua qaub tag nrho thiab ua tiav qhov kev kho cov yeeb yaj kiab ua ntej.

Static passivation standby: Ua ntej pub cov fermentation nruab nrab, tuav lub tank ntim nrog cov dej huv huv rau 12-24 teev kom rov tsim dua tag nrho TiO₂ tiv thaiv zaj duab xis.

3. Cov txheej txheem tseem ceeb tswj cov ntsiab lus rau kev txo qis ntawm cov yeeb yaj kiab tsis zoo
Xyuas kom meej tias cov cua sov fais fab sib cuam tshuam yog tswj nruj me ntsis thaum lub sij hawm ntxuav. To prevent local overheating that accelerates film dissolution, reduce the surface power density of the heating tube by 50% during acid/alkali circulation and prohibit full-power heating in the cleaning liquid.

Tiv thaiv kom tsis txhob muaj cov thermal stress microcracks ntawm brittle passive zaj duab xis los ntawm kev tswj tus nqi ntawm qhov kub thiab txias nyob rau hauv ib tug ntau ntawm tsawg dua los yog sib npaug zos rau 5℃/ min. Tsis txhob tso dej txias ncaj qha mus rau cov kav dej kub titanium.

Xyuas kom meej tias tag nrho cov qhov chaw ntawm lub raj yog tag nrho nrog cov kua txuas ntxiv. Tsim kom muaj kev cuam tshuam kev tiv thaiv rau qib kua; Yog hais tias cov kua theem poob mus rau qhov chaw uas cov raj ntu tau raug, lub zog cua sov yuav tsum raug cuam tshuam los tiv thaiv cov concentrated ion corrosion thiab qhuav - tawm.

Tswj qhov zaus ntawm kev tu lub voj voog raws li lub nra hnyav.

Tsawg-load sib quas ntus fermentation: Txhua lub lim tiam ib zaug CIP acid- puag ncig;

Ob lub lis piam alternating acid-paj ntxuav yog siv rau nruab nrab- thauj khoom 16-teev txhua hnub.

Siab -load, nruam fermentation rau 24 teev: niaj hnub ntxuav CIP me me, txhua hli sib sib zog nqus descaling acid voj voog.

4. Corrosion txaus ntshai thiab kev ua haujlwm tsis raug ntawm CIP
Tswv yim:

Kev ua haujlwm tsis txaus titanium cua sov Tube puas tshuab
Kev hloov pauv ncaj qha los ntawm cov alkali muaj zog rau cov kua qaub yam tsis tas yuav tsum muaj dej nruab nrab cleansingPassive zaj duab xis yog hloov pauv thiab cov microcracks loj heev tau sau los ntawm kev hloov pauv pH ntse.
Ntev - lub sij hawm ncig ntawm rhuab, concentrated alkali tshaj 80℃Nto roughness thiab dullness, irreversible uniform etching ntawm tag nrho cov phab ntsa
Nruam soaking nyob rau hauv ib tug diluted inorganic acid nyob rau hauv ib tug kub kub yam tsis muaj ib tug inhibitorThe matrix yog nkag mus los ntawm loj atomic hydrogen, uas ua rau ib tug zais hydrogen embrittlement uas ua rau ib tug nkig puas.
Kev ntxuav cov kua qaub nrog puv - lub zog cua sovPassive zaj duab xis yaig thiab pitting loj hlob sai sai los ntawm lub zos tube phab ntsa overheating.
Tam sim ntawd tso tseg tom qab ntxuav cov kua qaub thaum tsis muaj cov pa sov so - cov dej nplua nuj passivation. Cov yeeb yaj kiab puas tsis tuaj yeem kho tus kheej - kho vim tsis muaj cov pa oxygen, uas ua rau muaj kev nthuav dav ntawm qhov tsis xws luag mus rau hauv cov kab noj hniav sib sib zog nqus thaum lub sij hawm tom ntej.
Rau kev tshem tawm cov nplai, siv fluoride- muaj cov tshuaj descaling. TiO₂ zaj duab xis yog yaj tag, uas ua rau tag nrho titanium matrix corrosion.
5. Cov kauj ruam ntxiv rau kev tshaj tawm -CIP tshuaj xyuas thiab tu
Tom qab dhau los ntawm kev ua tiav CIP voj voog thiab passivation standby:

Kev kuaj pom pom nyob rau hauv lub teeb siab kom pom cov xim grey tsis sib xws lossis hauv cheeb tsam tsaus nti corrosion cim;

Peb lub hlis twg kev saib xyuas loj: Txhawm rau ntsuas qhov ncaj ncees ntawm cov yeeb yaj kiab passive, ua qhov kev ntsuam xyuas electrochemical. Yog tias lub peev xwm saum npoo tsawg dua +150mV, ua cov tshuaj hydrogen peroxide re-passivation.

Lub sij hawm ntev - corrosion poob los ntawm repetitive acid- puag ncig yog saib xyuas los ntawm ib nrab - txhua xyoo ntsuas ntawm phab ntsa thickness nyob rau hauv weld tshav kub- cuam tshuam zones.

Condensed Summary
Tsawg-concentration, qis-kub me me ntxuav kua mis yuav tsum tau siv rau cov kua qaub- puag alternating CIP tu ntawm titanium cua sov raj. Tsis tas li ntawd, kev hloov pauv dej nruab nrab yuav tsum tau muab tso rau ntawm cov txheej txheem alkali thiab acid. Tswj tus nqi ntawm kev hloov pauv kub thiab lub zog cua sov thaum lub sij hawm ncig, thiab xyuas kom meej tias muaj sijhawm txaus rau cov dej aerated passivation tom qab ntxuav. Txhawm rau kom txo qis kev puas tsuaj rau cov titanium dioxide passive zaj duab xis thiab txuas ntxiv lub neej kev pab cuam ntawm cov cua sov, nws raug nquahu kom tsis txhob siv cov kub alkali, fluoride reagents, thiab ntev - lub sij hawm siab - kub inorganic acid soaking.