Kev siv cov titanium alloys hauv kev lag luam roj av
Titanium kub exchangers, condensers thiab lwm yam auxiliary cuab yeej tau ntse siv nyob rau hauv petrochemical tuam txhab uas muag rau ntau tshaj 20 xyoo. Ntawm cov ntaub ntawv titanium, feem ntau siv cov khoom siv ntshiab titanium (TA2 yog qhov siv dav tshaj plaws), Ti-6Al-4V (thaum xav tau ib lub zog) thiab Ti-0.8Ni -0.3Mo (thaum muaj qhov sib txawv lossis tsis muaj oxidation nruab nrab).
(1) Hauv kev ua kom zoo ntawm cov roj sulfur siab thiab cov ntsev ntsev, cov khoom siv titanium yog qhov zoo tagnrho. Txawv teb chaws, titanium cov cuab yeej siv tau zoo nyob rau hauv ntau txoj kev xws li atmospheric distillation units, dej phwj siv kho mob, desulfurization sib cais ntauwd condensers, thiab stripping ntauwd radiators. Peb lub teb chaws kuj tau siv cam khwb cia titanium seawater twj, titanium condensers rau catalytic cracking thiab fractionation, cryogenic sib cais titanium condensers thiab ntxeem tau titanium daim hlau nyob rau hauv no system, uas tau ua hauj lwm rau ntau tshaj kaum xyoo tsis muaj teeb meem.
(2) Chlorinated hydrocarbons yog ib qho ntawm ntau hom khoom siv petrochemical. Vim muaj cov tshuaj chlorination cuam tshuam, cov khoom siv stainless hlau tsis txaus. Cov ntaub ntawv titanium tau siv rau txawv teb chaws los tsim methylene chloride distillation yees, trichloroethane tshav kub exchangers, condensation yees thiab fractionation yees, trichlorethylene condensation yees, perchlorethylene tshav kub exchangers thiab polychlorethylene coil heaters. Hauv kuv lub teb chaws cov khoom siv vinyl chloride, lub tais txhawb nqa, cov kav dej, thiab flange sealing qhov chaw ntawm cov kav dej txias, cov dej khib nyiab pov tseg, thiab cov dej khib nyiab khib nyiab yog tag nrho cov kab nrog Ti-0.2Pd thiab tau siv ze li kaum xyoo tsis muaj corrosion. Titanium kav, fittings thiab gas distributors tau tsim los ntawm titanium rau ntau xyoo.
(3) Phenol yog cov khoom siv tseem ceeb hauv kev lag luam petrochemical. Nws siv propylene thiab benzene nyob rau hauv cov roj refining roj ua raw khoom, thiab tsim phenol thiab acetone los ntawm cumene thiab cumene peroxide. Nov yog txheej txheem tshiab. Cov khoom siv titanium tau siv nyob txawv teb chaws ntau tshaj kaum xyoo dhau los, tab sis cov txheej txheem no tseem nyob rau theem kev loj hlob hauv kuv lub tebchaws. Cov txheej txheem qub siv benzene sulfonation alkali tov los tsim phenol. Peb lub teb chaws tau txais titanium neutralization reactors, titanium coil coolers thiab ion titanium nitride stirring tsho, nrog rau cov txiaj ntsig zoo heev.
(4) Ntxiv rau cov khoom siv raw thiab cov khoom, titanium tshav kub exchangers, condensers thiab lwm yam auxiliary cov cuab yeej tau ntse siv nyob rau hauv petrochemical tuam txhab uas muag nyob rau hauv oxidation ntawm ethylene rau acetaldehyde, oxidation ntawm acetaldehyde rau acetic acid, thiab oxidation ntawm propylene rau acetone. . Ntau tshaj 20 xyoo dhau los. Ntawm cov ntaub ntawv titanium, feem ntau siv cov khoom siv ntshiab titanium (TA2 yog qhov siv dav tshaj plaws), Ti-6Al-4V (thaum xav tau ib lub zog) thiab Ti-0.8Ni -0.3Mo (thaum muaj qhov sib txawv lossis tsis muaj oxidation nruab nrab).
(5) Acetaldehyde oxidation rau acetic acid yog txheej txheem ntau hauv kuv lub tebchaws. Cov ntaub ntawv titanium tam sim no siv los ua cov kub kub kub reboilers, thawj acetic acid ntauwd reboilers, condensation coolers thiab lwm yam khoom siv. Cov khoom siv titanium txawv teb chaws feem ntau yog siv rau hauv cov tshuaj tua kab, cov fractionating towers, thiab cov tshuaj tua hluav taws. Tshwj xeeb tshaj yog thaum qis alkanes yog oxidized los tsim acetic acid, muaj ntau los ntawm cov khoom, thiab formic acid cov ntsiab lus mus txog 8%, uas yog heev corrosive. Nyob rau hauv rooj plaub no, siv titanium alloy es tsis txhob stainless hlau yuav muaj ib tug zoo tagnrho cov nyhuv.
(6) Terephthalic acid yog cov khoom siv raw rau kev sib txuas ntawm polyester thiab yog tsim los ntawm oxidation ntawm paraxylene. Txawm hais tias qhov kub ntawm oxidation los yog kub oxidation tsawg, muaj qhov kub thiab txias corrosion tshwm sim los ntawm acetic acid thiab bromide. Hauv xov xwm nrog qhov kub siab tshaj 135 degree, pitting corrosion yuav tshwm sim hauv 316L stainless hlau tom qab kaum ob teev. Yog li, cov qauv tsim tshwj xeeb qhia tias cov khoom siv titanium yuav tsum tau siv siab dua 135 degree. Kev siv cov khoom siv titanium yog qhov zoo heev, thiab qhov kev cia siab rau kev nce qib thiab kev siv tau zoo heev.
(7) Urea yog cov tshuaj chiv zoo thiab cov khoom siv raw rau kev lag luam petrochemical. Txij li thaum thawj titanium-lined urea synthesis ntauwd tau muab tso rau hauv kev ua haujlwm hauv xyoo 1963, tam sim no muaj ze li ntawm 10, 000 units ntawm cov cuab yeej no ua haujlwm thoob ntiaj teb. Kev xyaum tau pom tias tsis muaj qhov pom tseeb corrosion hauv titanium-lined urea synthesis ntauwd. Qhov hloov pauv corrosion ntawm 316L stainless hlau yog 4.1-4.5mm/a. Yog li ntawd, titanium muaj txiaj ntsig zoo nyiaj txiag zoo dua li cov hlau tsis muaj steel. Ntxiv rau titanium-lined urea synthesis towers, CO2 strippers, tshav kub exchangers, mixers, twj tso kua mis li qub, thiab lwm yam tau siv nyob rau hauv peb lub teb chaws txij li thaum 1970s. Ntxiv nrog rau muaj qee yam kev txhim kho corrosion, lub ntsiab corrosion nruab nrab yog cov catalyst, nyob rau hauv uas stainless hlau corrodes sai sai, thiab tsuas yog titanium muaj zoo corrosion kuj. Thaum ntxov li xyoo 1963, Tebchaws Meskas tau ua tiav titanium rau txoj kev ethylene oxidation los tsim acetaldehyde. kuv lub teb chaws thawj ethylene oxidation rau acetaldehyde chav tsev tau muab tso rau hauv kev siv nyob rau hauv 1976, thiab titanium chav ua hauj lwm zoo rau niaj hnub no. Lub txawv teb chaws titanium-lined reactor yog 9.6m siab, 3m nyob rau hauv txoj kab uas hla, thiab muaj 11 titanium khoom xws li tshav kub exchangers, catalyst regeneration yees, thiab acetaldehyde tov coolers. Tom qab xyoo 1980s hauv kuv lub tebchaws, Shanghai thiab Jilin tau qhia ua tiav cov khoom siv rau ethylene oxidation rau acetaldehyde los ntawm txawv teb chaws. Ntau yam khoom siv, twj tso kua mis, thiab li qub yog ua los ntawm titanium, uas muaj qhov zoo ntawm cov hlau tsis muaj steel thiab muaj txiaj ntsig zoo heev. Qhov kawg tsim ntawm propylene oxidation rau acetone suav nrog 12 cov khoom siv titanium. Ib lub Hoobkas nrog cov zis txhua xyoo ntawm 30,{24}} tons ntawm acetone muaj 40 tons ntawm cov khoom siv titanium.
