Lub luag hauj lwm dab tsi ua Fluoropolymer Exchangers ua si hauv qhov txias txias Caustic Soda hauv Chlor-Alkali Nroj Tsuag?
Tso lus
Kub concentrated caustic soda yog notoriously hostile rau hlau, ua rau kev nyuaj siab corrosion tawg nyob rau hauv stainless hlau thiab dav corrosion nyob rau hauv ntau alloys. Chlor-alkali nroj tsuag xav tau cov khoom siv hluav taws xob sib hloov uas tuaj yeem tiv taus qhov chaw txias ntawm 50 feem pua sodium hydroxide los ntawm lub xov tooj ntawm tes mus rau qhov kub thiab txias.
Chlor-Alkali Nroj Tsuag: Txias ntawm Caustic Soda
Electrolysis ntawm sodium chloride hauv chlor-alkali nroj tsuag tsim sodium hydroxide (NaOH). Lub caustic soda uas ua rau feem ntau yog nyob rau hauv qhov concentration ntawm 32-50% ntawm qhov kub thiab txias 80-100 ° C. Cov khoom no yuav tsum tau txias mus rau kwv yees li . 40-50°C ua ntej cia lossis xa khoom xa tuaj rau kev ua haujlwm ntxiv. Kev ua kom txias ntawm cov tshuaj caustic no yog qhov tseem ceeb rau kev nyab xeeb thiab kev ua tau zoo ntawm cov txheej txheem.
Cov kev daws teeb meem yog corrosive heev thiab yuav tsum tau cov khoom siv hluav taws xob uas tuaj yeem tiv taus qhov kub thiab txias tsis muaj degradation lossis tsis ua haujlwm thaum ntxov.
Cov Khoom Sib Tw hauv Cov Dej Txias Caustic Soda
Qhov teeb meem tseem ceeb hauv kev ua kom txias cov dej qab zib kub yog qhov kev ua phem ntawm sodium hydroxide ntawm qhov kub thiab txias. Kub caustic soda tuaj yeem ua rau muaj kev ntxhov siab corrosion tawg (SCC) ntawm cov hlau tsis muaj steel, txawm tias cov qib corrosion resistant 316L. SCC yog qhov teeb meem tshwj xeeb hauv cov ntawv thov uas cov khoom raug cuam tshuam rau qhov kub thiab txias, uas tuaj yeem ua rau muaj kev puas tsuaj loj hauv cov khoom siv hluav taws xob.
Nickel raws li alloys xws li Nickel 200 thiab Hastelloy qhia tsis kam mus rau caustic soda tab sis lawv raug nqi thiab tsis tas yuav yog qhov kev lag luam zoo tshaj plaws rau kev siv cua txias loj. Ntawm no yog qhov twg fluoropolymers, xws li PTFE thiab PFA, tuaj rau hauv lawv tus kheej.
Vim li cas Fluoropolymer Thaum tshav kub kub Exchangers yog qhov kev xaiv zoo tshaj plaws rau Caustic Soda Txias
Fluoropolymer heat exchangers, tshwj xeeb tshaj yog cov tsim ntawm PTFE (polytetrafluoroethylene) thiab PFA (perfluoroalkoxy) fluoropolymers, muaj ob peb yam tseem ceeb rau kev txias caustic soda:
Tag Nrho Kev Ua Phem rau Caustic Soda: Tus cwj pwm nruj ntawm cov dej qab zib tsis muaj teeb meem rau PTFE lossis PFA, txawm tias qhov siab tshaj plaws (txog 50%) thiab kub (txog 110 ° C). Qhov no tshem tawm qhov ua tau ntawm cov khoom degradation thiab tsis ua haujlwm,
Kev Tiv Thaiv Kev Nyuaj Siab Corrosion Cracking (SCC) Tsis zoo li cov hlau, fluoropolymers tsis raug rau SCC nyob rau hauv cov mob caustic. Qhov no ua rau lawv cov khoom tsim nyog rau kev siv dej qab zib kub kub.
Tus nqi-Cov tshuaj zoo: Cov nickel alloys siab tiv taus cov dej qab zib caustic, tab sis lawv kim dua. Rau ntau cov tshuaj chlor-alkali cov chaw, cov nqi qis dua fluoropolymer xws li PTFE thiab PFA muab kev lag luam ntau dua los muab cov kev xav tau.
Exchanger Configurations Plhaub-thiab-tube heat exchangers nrog fluoropolymer tubes yog siv rau feem ntau caustic soda cooling applications. Cov caustic kub dhau los ntawm cov raj fluoropolymer thiab cov dej txias los yog lwm yam dej hloov hluav taws xob yog siv rau ntawm lub plhaub sab uas muab kev sib kis tau zoo thiab sib xws.
Cov fluoropolymer exchangers muab cov lus teb muaj kev cia siab thiab kev lag luam rau qhov teeb meem ntawm kev ua kom txias kub caustic soda nyob rau hauv chlor-alkali nroj tsuag, sidestepping cov teeb meem thiab cov nqi siab ntawm hlau nyob rau hauv xws li mob hnyav.
Tej teeb meem
NaOH Concentration. Caustic soda feem ntau muaj nyob rau hauv ntau ntawm 32 mus rau 50%. Qhov no tsim teeb meem loj hauv kev xaiv cov khoom siv.
Qhov kub thiab txias: Caustic soda feem ntau yog txias rau qhov kub ntawm 80-100 ° C, uas yog nyob rau hauv qhov kub siab ntawm PTFE (txog 110 ° C). PFA tej zaum yuav zoo dua rau cov ntawv thov kub dua, vim nws muaj peev xwm kub dua.
Corrosion Resistance: Kev siv PTFE thiab PFA tshem tawm txoj kev pheej hmoo ntawm kev ntxhov siab corrosion tawg nyob rau hauv ib puag ncig caustic, kom ntseeg tau ntev -lub sij hawm cia siab rau lub tshav kub exchanger system.
Kev sib piv ntawm Cov Khoom Siv Table
Material Resistance rau CorrosionTemperature txwv|Nqi|Haum rau Txias Caustic Soda
316L Stainless Susceptible rau SCC nyob rau hauv kub causticHigh mus txog 300 ° C Tsis qhia rau chilling rhuab caustic soda.
Nickel 200 (UNS N02200) Tus nqi kim thiab tiv taus cov dej qab zib kub siab heev txog 300 ° C Haum tab sis kim Zoo heev tiv thaiv rau caustic soda PTFEUp mus rau 110 ° C Tsawg Zoo rau caustic soda txias
PFA zoo heev tiv thaiv rau caustic soda.Txog 260℃Nruab Nrab Zoo heev rau lub luag haujlwm ntawm qhov kub thiab txias
Cov ntsiab lus
Fluoropolymer heat exchangers, tshwj xeeb tshaj yog PTFE thiab PFA, yog ib qho pov thawj, ib qho kev daws teeb meem rau txias kub caustic soda hauv chlor-alkali nroj tsuag. Cov ntaub ntawv no tshem tawm kev ntxhov siab corrosion cracking thiab muaj kev tiv thaiv zoo dua rau tus cwj pwm nruj ntawm sodium hydroxide. Fluoropolymer exchangers yog tus nqi - siv tau zoo rau siab -nickel alloys thiab pab kom muaj kev ua haujlwm zoo thiab nyab xeeb hauv daim ntawv thov dej qab zib txias.
Kev xaiv cov khoom yog qhov tseem ceeb hauv chlor-alkali nroj tsuag kom tsis txhob muaj kev cuam tshuam tsis zoo ntawm corrosion thiab tawg. Fluoropolymer exchangers muab ib tug nqi zoo lwm txoj rau cov teeb meem - dawb ua hauj lwm nyob rau hauv nyuaj caustic tej yam kev mob.
