Nyob rau hauv lub realm ntawm chemical engineering, caustic soda ntau lawm ntsib cov teeb meem tseem ceeb ntawm corrosion thaum lub sij hawm tsim khoom. Tshwj xeeb yog yooj yim rau corrosion nyob rau hauv gaseous los yog kua ib puag ncig, tsoos cam khwb cia hlau thiab carbon steel cov cuab yeej tawm tsam tawm tsam hauv zos thiab crevice corrosion assaults. Txhawm rau tiv thaiv qhov teeb meem no, kev lag luam thoob ntiaj teb caustic soda tau hloov pauv mus rau cov khoom siv titanium.
Titanium daim ntawv thov dav hauv kev tsim cov dej qab zib caustic yog qhov tseeb. Leveraging nws tshwj xeeb corrosion kuj, titanium cov ntaub ntawv yog feem ntau siv nyob rau hauv distillation gas coolers thiab condensers, tshwj xeeb tshaj yog nyob rau hauv nyias-walled titanium hlab nrog ib tug lifespan txog li 20 xyoo. Qhov no tsis yog tsuas yog optimizes tshav kub hloov tej yam kev mob, tab sis kuj xyuas kom meej tias cov khoom siv lub tshav kub hloov thiab cov yeeb nkab cross-sectional cheeb tsam tsis ploj zuj zus vim xeb, tshwj xeeb tshaj yog tseem ceeb heev rau distillation condensers.
Ua piv txwv hauv Tebchaws Meskas, kev siv cov titanium raj hauv caustic soda ntau lawm tau hloov qhov kev xav tau rau ob xyoos cam khwb cia hlau raj hloov. Qhov kev pib no ua rau lub neej ntev ntawm cov cuab yeej siv thiab ua kom muaj peev xwm ntau lawm los ntawm 25%. Tsis tas li ntawd, txhawm rau txo cov nqi ntxiv, cov teb chaws txawv teb chaws tau pib koom nrog seamed nyias-walled welded titanium strips los hloov seamless hlab thiab dav siv titanium phaj kub exchangers.
Txij li thaum xyoo 1965, Tuam Tshoj tau tshawb nrhiav kev siv cov khoom siv titanium los daws cov teeb meem corrosion ntawm cov khoom siv hauv caustic soda ntau lawm. Titanium ntau yam kev siv nyob rau hauv caustic soda zus tau tej cov khoom tseem ceeb, xws li crystallization sab nraud coolers, distillation ntauwd ammonia condensers, ammonium chloride niam cawv rhaub, phaj kub exchangers, kaus phaj kub exchangers, carbide ntauwd txias kav, carbon dioxide turbine compressor impellers, thiab alkali twj tso kua mis.
Qhov tseem ceeb tshwj xeeb yog cov carbide ntauwd, cov khoom siv tseem ceeb hauv cov dej qab zib ua kua dej uas txo qis cov dej tso tsheb hlau luam 'cov kav dej txias yuav ntsib kev puas tsuaj loj heev. Txawm hais tias yav dhau los tau sim nrog ntau yam kev tiv thaiv corrosion ua pov thawj tias tsis muaj txiaj ntsig, kev siv cov kav dej titanium es tsis txhob cam khwb cia hlau tau tshem tawm corrosion tau ntau xyoo, ua rau muaj txiaj ntsig zoo rau kev lag luam. Tsis tas li ntawd, kev siv ntau ntawm titanium twj tso kua mis muaj ntau yam zoo. Kev sim ua kom pom tau tias cov twj titanium tsis tsuas yog tiv thaiv corrosion thiab hnav, tab sis kuj ua haujlwm ntawm 70% mus rau 80% kev ua haujlwm rau lub sijhawm ntev, txuag hluav taws xob, ua kom tsis muaj hluav taws xob, kev txuag khoom, kev huv huv, thiab ua tiav lub neej ntev ntawm 20 txog 30 xyoo. .
