Nyob rau hauv - deposit corrosion tsis ua hauj lwm yog hais txog nplai, sediment thiab impurities tsis tu ncua adhering thiab accumulating nyob rau hauv lub puab phab ntsa ntawm cua sov raj thaum nruab nrab ncig. Ib qho chaw kaw tsis tu ncua ua rau hauv qab cov deposits, ua rau ion concentration sib txawv thiab oxygen depletion. Hauv zos pitting thiab ulcerative corrosion tshwm sim nyiam nyob rau hauv txheej txheej, uas maj mam nkag mus rau hauv cov yeeb nkab phab ntsa thiab ua rau nruab nrab to. Qhov no tsis ua hauj lwm yog heev zais raws li corrosion tsim nyob rau hauv ib tug txuas nrog av txheej, qeb duas raws li ib tug ntawm cov feem ntau zais txaus ntshai rau ntev -khiav stainless hlau cua kub ncig pipelines.
1. Nyob rau hauv -Deposit Corrosion Evolution Mechanism
Calcium thiab magnesium ions, tshem tawm hais thiab corrosion khoom nyob rau hauv lub cua sov nruab nrab precipitate thiab adheres rau cov yeeb nkab sab hauv phab ntsa nyob rau hauv tas li ntawd mus cua sov, tsim compact scale deposits. Qhov chaw npog los ntawm qhov ntsuas tsis tuaj yeem ntxiv nrog cov khoom siv tshiab, ua rau cov pa oxygen tsis txaus hauv cov txheej txheem tso nyiaj. Cov hlau nto hauv qab nplai hloov mus rau hauv ib qho anode thiab yaj tsis tu ncua, thaum lub phab ntsa ntawm cov yeeb nkab raug siv los ua cov cathode. Chloride ions thiab acidic tshuaj yog txuas ntxiv enriched nyob rau hauv occluded qhov sib txawv ntawm teev thiab substrate, txo qis pH nqi hauv zos thiab accelerating localized etching. Corrosion pits nthuav vertically sab hauv kom txog thaum perforation tshwm sim. Tsis zoo li txhua yam corrosion, qhov kev puas tsuaj no yog nyob hauv zos thiab zais, tsis muaj qhov txawv txav ntawm cov yeeb nkab sab nrauv nyob rau theem pib.
2. Cov hauj lwm zoo raug rau hauv qab -Txoj Kev Txhaum Cai
Kab rov tav yeeb nkab hauv qab qhov twg sediments dab dej thiab sau tau ntev;
Pipeline luj tshib, tees thiab cov ceg tuag nrog cov dej ntws tsis zoo;
Cov cua kub coil sab hauv phab ntsa nrog qis qis tshaj tawm thiab loj scaling nyiam;
Cov ntu thaiv hauv zos nrog qhov nruab nrab stagnation thiab av loj heev;
Thaum tshav kub kub concentration cheeb tsam nrog kub accelerating ion crystallization thiab deposition.
3. Core Inducing Factors Accelerating Corrosion Damage
Circulating nruab nrab nrog siab hardness, siab impurity cov ntsiab lus thiab tsis pretreatment pom;
Ntev - lub sijhawm ua haujlwm qis qis tsis tuaj yeem tsim cov dej ntws ntws los ntxuav cov ntawv txuas;
Tsis muaj tshuaj ntxuav thiab ntxuav hauv online kom tshem tawm cov nplai qub;
Kev tsim cov kav dej tsis zoo nrog cov kav dej tsis pom kev ntau dhau thiab ntws qhov chaw tuag;
Kev khiav hauj lwm kub dhau los txhawb kom nag lossis daus sai ntawm cov ntsev inorganic hauv nruab nrab.
4. Tag nrho -Txuas Kev Tiv Thaiv thiab Tswj Kev Ntsuas Kev Ntsuas
① Nruab ntau-theem pom cov cuab yeej ntawm qhov system inlet
Lim tawm cov impurities los txiav tawm qhov chaw ntawm sediment deposition.
② Ntxiv scale inhibitors thiab dispersants rau hauv nruab nrab circulating
Tshem tawm ntsev crystallization thiab nplai adhesion los ntawm cov kua dej sab.
③ Tswj xyuas qhov ceev nrawm nrawm kom ntxiv dag zog rau tus kheej - ntxuav scouring
Zam kom tsis txhob ntev -lub sij hawm qis- flow stagnant kev ua haujlwm.
④ Tsim kho - voj voog pickling thiab online flushing tu txoj kev npaj
Ua tib zoo strip lub hnub nyoog scale thiab tshem tawm occluded corrosion ib puag ncig.
⑤ Ua kom zoo dua cov raj xa dej kom tshem tawm cov ceg tuag tsis tu ncua thiab txo txoj kab nruab nrab sai.
5. Kev Tiv Thaiv Cov Teeb Meem Sib piv
表格
| Kev khiav hauj lwm & Kev tu hom | Hauv qab -Txoj Kev Txhaum Cai Txhaum Cai | Daim ntawv thov tswv yim |
|---|---|---|
| Tsis pom + tsis noj tshuaj tiv thaiv -scaling + ntev-lub sij hawm tsis tu | Kev nrawm nrawm perforation hauv qab nplai hauv ib lub voj voog ua haujlwm | Nres cov cuab yeej siv thiab ua cov tshuaj tua kab mob tag nrho tam sim ntawd |
| Pem hauv ntej- kawg impurity interception + nruab nrab dosing + periodic descaling | Ua zoo inhibit scale buildup thiab zais hauv zos corrosion | Txuj kev ua haujlwm tshwj xeeb rau stainless hlau cua sov ncig tshuab |
| Flow teb optimization + tsis tu ncua phab ntsa thickness nrhiav + tsis siv neeg tu system | Tsawg heev nyob rau hauv - deposit to leakage risk | Cov txheej txheem nyiam rau cov khoom siv hluav taws xob tsis tu ncua tsis tu ncua |
Xaus
Nyob rau hauv - deposit corrosion ntawm 316 stainless hlau cua sov raj tshwm sim los ntawm ib puag ncig corrosive microenvironment tsim nyob rau hauv scale sediments, uas ua rau txawv concentration cell corrosion thiab nce phab ntsa nkag. Cov kev tswj xyuas tseem ceeb suav nrog kev ua kom huv hauv nruab nrab, tiv thaiv kev tsim cov nplai ntawm cov tshuaj ntxiv, ua kom cov dej ntws tawm zoo thiab tsis tu ncua tshem tawm cov av. Kev tswj xyuas zoo ntawm kev kho nruab nrab, cov qauv kav dej thiab kev saib xyuas niaj hnub tuaj yeem tiv thaiv kom tsis txhob raug kaw thiab kev nyab xeeb xwm txheej tshwm sim los ntawm hauv qab - tso nyiaj corrosion perforation ntawm cov cua sov raj.
