Kev siv ntawm Incoloy 925 hauv Kev Lag Luam Kev Lag Luam thiab Nws Kev Tsim Nyog rau Reactors & Kub Exchangers
1. Cov xwm txheej tseem ceeb siv tau rau kev lag luam tshuaj
(1) Oilfield Chemical Processing Systems
Incoloy 925 qhia tau zoo heev tiv thaiv sulfide stress cracking (SSC), chloride-induced stress corrosion cracking (SCC), thiab dav corrosion nyob rau hauv ib puag ncig uas muaj H₂S, CO₂, thiab chloride ions. Nws yog dav siv nyob rau hauv downhole Cheebtsam, wellhead Christmas ntoo, thiab pipeline systems rau qaub roj thiab roj teb, qhov twg nws muaj peev xwm tiv taus tej yam kev mob ntawm kev kub siab (txog 10000 psi), siab kub (txog 204 degree), thiab siab chloride ion concentrations (dhau 100000 ppm). Nyob rau hauv cov tshuaj kho mob koom nrog, nws kuj yog siv rau cov khoom siv rau desulfurization thiab lub cev qhuav dej ntawm cov roj crude thiab natural gas.
(2) Cov txheej txheem acidic ib puag ncig
Cov alloy qhia tau hais tias zoo heev corrosion kuj nyob rau hauv uas tsis yog - oxidizing mineral acids xws li dilute hydrochloric acid thiab sulfuric acid, tshwj xeeb tshaj yog nyob rau hauv cov kev daws teeb meem nrog tsawg oxidant concentrations. Nws yog haum rau:
Pickling kab hauv cov nroj tsuag tshuaj, rau kev tuav cov kua qaub pickling daws uas muaj hydrochloric acid los yog sulfuric acid.
Phosphoric acid ntau lawm tshuab, rau cov khoom sib cuag nrog ntub - txheej txheem phosphoric acid (muaj fluoride impurities).
Organic acid ua units, suav nrog acetic acid thiab formic acid ntau lawm cov cuab yeej, qhov twg nws tiv taus corrosion tsis zoo thiab pitting corrosion.
(3) Corrosive Fluid Handling Systems
Rau cov txheej txheem tshuaj lom neeg uas muaj cov tshuaj chloride ions, oxidizing ntsev, los yog sib xyaw corrosive media, Incoloy 925 yog siv los tsim cov twj, li qub, thiab cov kav dej. Cov ntawv thov ib txwm muaj xws li:
Chlor-alkali kev lag luam auxiliary systems, rau conveying brine los yog dilute caustic soda daws.
Cov chav kho dej khib nyiab hauv cov nroj tsuag tshuaj, tshwj xeeb tshaj yog rau cov dej khib nyiab uas muaj cov hlau hnyav ions.
2. Haum rau Reactors thiab Kub Exchangers
(1) Haum rau Reactors
Incoloy 925 muaj feem xyuam rau kev tsim cov tshuaj reactors, tshwj xeeb tshaj yog rau cov reactors ua haujlwm raws li cov hauv qab no:
Cov tshuaj tiv thaiv kab mob corrosive: Cov tshuaj tiv thaiv rau cov tshuaj tiv thaiv uas muaj roj qaub, chloride- muaj cov tshuaj, los yog dilute mineral acids. Piv txwv li, reactors siv los tsim cov organic sulfides lossis acid- catalyzed esterification cov tshuaj tiv thaiv.
Nruab nrab kub thiab siab ntau yam: Cov alloy tswj cov khoom ruaj khov ntawm qhov kub txog li 540 degree; ntawm qhov kub qis dua 204 degree, nws cov corrosion kuj yog qhov zoo. Nws yog tsim rau reactors nrog kev khiav hauj lwm siab xws li atmospheric siab mus rau siab (10-15 MPa).
Cov qauv tsim kom zoo: Cov hlau muaj qhov zoo weldability (siv cov khoom siv sib txuam xws li Alloy 925 vuam hlau) thiab tuaj yeem tsim rau hauv loj - ntim reactor plhaub thiab cov khoom siv sab hauv (xws li agitators, baffle phaj). Nws kuj tseem muaj kev qaug zog zoo heev, uas yog qhov tseem ceeb rau cov reactors uas muaj kev hloov pauv ntawm lub zog cyclic.
(2) Tsim nyog rau cov cua sov Exchangers
Thaum tshav kub kub exchangers yog ib qho ntawm cov kev siv tseem ceeb ntawm Incoloy 925 hauv kev lag luam tshuaj, nrog rau cov hauv qab no zoo:
Kev tiv thaiv corrosion nyob rau hauv ob-theem media: Thaum tshav kub kub exchangers feem ntau cuam tshuam cov cua kub hloov ntawm cov kua sib txawv. Incoloy 925 tuaj yeem tiv taus xeb los ntawm ob sab txheej txheem (piv txwv li, chloride- muaj cov tshuaj, cov kua qaub) thiab cov khoom siv hluav taws xob (xws li dej txias nrog cov ntsiab lus chloride siab). Nws yog dav siv hauv plhaub- thiab- raj kub exchangers rau condensing qaub roj, txias acidic txheej txheem kwj, thiab cua kub corrosive kua.
High thermal efficiency thiab mechanical stability: Lub alloy muaj ib tug thermal conductivity ntawm kwv yees li 11.2 W / (m·K) nyob rau hauv chav tsev kub, uas yog haum rau cov tshav kub hloov daim ntaub ntawv. Nws kuj muaj cov thermal expansion coefficient tsawg (13.6 × 10⁻⁶ /℃los ntawm 20-100 degree), txo cov thermal stress thaum lub sij hawm kub cycling, uas yog ib qho tseem ceeb rau kev ncua lub neej kev pab cuam ntawm tshav kub exchangers.
Cov xwm txheej ntawm daim ntawv thov feem ntau: Cov khoom siv hluav taws xob siv hluav taws xob, cov tshuaj cog cov txheej txheem cov kua dej txias, thiab cov cua sov rov qab rau hauv cov roj qaub.
3. Kev txwv thiab ceev faj
Thaum Incoloy 925 muaj ntau yam, nws muaj kev txwv uas yuav tsum tau txiav txim siab hauv kev siv tshuaj:
Nws tsis pom zoo rau oxidizing acidic ib puag ncig (xws li, concentrated nitric acid, kub concentrated sulfuric acid nrog siab oxidant concentrations), raws li nws yuav raug kev txom nyem los ntawm hnyav uniform corrosion.
Nyob rau hauv siab - qhov kub thiab txias tshaj 540℃, nag lossis daus - lub zog ntawm cov hlau yuav dhau - kev laus, ua rau muaj kev poob qis hauv cov khoom siv kho tshuab.
Thaum siv nyob rau hauv reactors thiab tshav kub exchangers, tsim nyog ncej-weld kev kho cua sov (kev daws annealing ntawm 980-1010℃tom qab los ntawm kev laus ntawm 718-749 degree) yog yuav tsum tau los kho nws corrosion kuj thiab txhua yam khoom.
