Dab tsi yog qhov txawv ntawm PTFE Thaum tshav kub kub Exchanger nrog Carbon Steel Plhaub thiab ib qho nrog Stainless Hlau Plhaub?

Nyob rau hauv lub plhaub thiab lub raj kub exchanger nrog PTFE cov txheej txheem kua yeej tsis pom lub plhaub - tsuas yog PTFE hlab thiab tubesheets. Tab sis kev xaiv ntawm cov khoom siv plhaub, feem ntau yog carbon lossis stainless hlau, yog qhov tseem ceeb rau tus nqi, lifespan thiab compatibility nrog installation ib puag ncig. Kev nkag siab txog cov kev sib txawv no tuaj yeem pab cov khoom siv hluav taws xob tag nrho, tsis yog cov ntu ntub dej xwb, muab kev pabcuam txhim khu kev qha thoob plaws hauv nws lub neej.

PTFE's Shell Role Plhaub thiab Tube Exchangers
Hauv PTFE lub plhaub thiab lub raj xa hluav taws xob, lub plhaub yog lub siab - muaj lub nkoj uas muaj cov dej ua haujlwm ( dej txias, chav dej, cua sov nruab nrab) nyob ib ncig ntawm PTFE raj pob. Lub plhaub tsis pom cov txheej txheem corrosive kua, nws yog tag nrho cov tswj los ntawm PTFE hlab, tubesheets thiab tej sab hauv fluoropolymer liner. Raws li, cov khoom siv plhaub tau xaiv los ntawm kev txiav txim siab lwm yam tsis yog kev tiv thaiv sab hauv corrosion:

Mechanical lub zog los tiv thaiv lub siab ntawm cov dej ua haujlwm.

Kev sib raug zoo nrog ib puag ncig sab nraud (cog huab cua, av noo, tshuaj vapors, cov txheej txheem ntxuav).

Nqi thiab muaj

Thermal expansion thiab hnyav zog.

Ob lub plhaub nrov tshaj plaws rau cov khoom siv hluav taws xob PTFE yog carbon steel thiab stainless hlau, feem ntau yog Hom 304 lossis 316. Lawv txhua tus muaj lawv cov txiaj ntsig thiab qhov tsis zoo.

Carbon Steel Plhaub: Tus nqi qis tshaj plaws, yuav tsum muaj kev tiv thaiv sab nraud
Cov pa roj carbon steel yog cov khoom siv tshaj plaws rau cov hlab ntsha siab hauv kev ua haujlwm tsis tu ncua. Rau PTFE tshav kub exchangers ib carbon steel plhaub muab:

Tus nqi qis tshaj plaws ua ntej - Cov pa roj carbon steel nqi qis dua cov hlau tsis muaj steel, ib kilogram. Rau cov kab loj loj (piv txwv li . 300 mm txog 1 m) tus nqi sib txawv yuav yog qhov tseem ceeb.

Lub zog siab - Cov pa roj carbon steel muaj cov khoom siv zoo yog li koj tuaj yeem siv cov phab ntsa nyias dua piv rau lwm cov khoom siv rau tib lub siab ntsuas.

Muaj khoom zoo - Carbon steel yeeb nkab, phaj thiab flanges feem ntau yog stocked los ntawm ntau qhov chaw.

Cov huab cua ntub dej, noo noo, lossis tshuaj vapors ua rau cov pa roj carbon steel, ua rau nws corrode los ntawm sab nraud. Lub tshav kub exchanger muaj lub plhaub sab nraud. Cov txheej txheem kua dej tsis tuaj rau hauv lub plhaub, tab sis cov nroj tsuag ib puag ncig ua. Cov huab cua nyob rau hauv ntau cov txheej txheem tshuaj thiab nto tiav cov nroj tsuag muaj:

Acid fumes (HCl, H₂SO₄, HNO₃)

Chlorides los yog chlorine

Damp thiab condensation

Cov tshuaj no ua rau cov pa roj carbon steel thaum lub sijhawm ua kom xeb thiab pitting. Lub PTFE lub raj ntim thiab cov txheej txheem cov kua dej tsis raug rau sab nraud corrosion, tab sis lub plhaub yuav ua rau nws lub siab ruaj khov, tuaj yeem xau cov dej ua haujlwm (xws li dej txias lossis chav dej), thiab tuaj yeem muaj kev txhawj xeeb txog kev nyab xeeb.

Txhawm rau txo qis kev tiv thaiv sab nraud, carbon steel plhaub feem ntau coated nrog cov txheej txheem tiv thaiv los yog pleev xim. Cov kev xaiv zoo tshaj plaws yog:

Epoxy lossis polyurethane xim (ob -cov khoom siv)

Txheej: Powdercoated

Kub dip galvanizing ntawm cov khoom me me

Txawm li cas los xij, cov txheej txheem yuav tsum tau kuaj xyuas thiab kov- nce, tshwj xeeb tshaj yog nyob rau hauv cov xwm txheej phem. Yog tias cov txheej txheem puas lawm (xws li los ntawm kev cuam tshuam los yog puas) cov hlau hauv qab yuav pib corrode sai.

Stainless Hlau Plhaub: kim dua, zoo dua sab nraud corrosion kuj
Stainless hlau plhaub, feem ntau hom 304 los yog Hom 316, muab kev tiv thaiv zoo rau huab cua corrosion, tshuaj vapors thiab cov dej ntxuav. Cov chromium concentration (tsawg kawg 10.5% rau 304, thiab npib tsib xee thiab molybdenum rau 316) tsim ib tug passive oxide txheej uas tiv thaiv cov hlau los ntawm xeb.

Cov khoom tseem ceeb ntawm stainless hlau plhaub yog:

Sab nraud corrosion kuj zoo heev - Stainless hlau tuaj yeem sab laug tsis pleev xim lossis passivated. Nws tiv taus cov av noo, ntug hiav txwv dej los yog tshuaj lom neeg xav tau cov nroj tsuag huab cua yam tsis tas yuav tsum muaj txheej txheej tu.

Tus nqi pib siab dua - Raws li cov khoom siv, cov hlau tsis muaj steel feem ntau yog 3 txog 5 npaug kim dua cov hlau. Fabrication cov nqi kuj tseem ntau dua vim qhov yuav tsum tau ua kom ceev faj txoj kev vuam (kom tsis txhob chromium carbide nag lossis daus) thiab ua tau tom qab-weld kho.

Lub zog ntawm stainless hlau zoo ib yam lossis qis dua - Stainless hlau muaj lub zog tensile zoo sib xws rau cov hlau (xws li . 304 muaj zog yield ~ 205MPa, carbon steel ~ 250MPa). Cov phab ntsa yuav tsum yog me ntsis thicker rau tib lub siab ntsuas, tab sis qhov sib txawv feem ntau yog negligible.

Qhov hnyav? - Stainless hlau muaj qhov ntom ntom ntawm tib yam li carbon steel (7.9-8.0 g / cm³) yog li qhov hnyav yuav sib npaug rau tib qhov ntau thiab tsawg.

Stainless hlau plhaub yog feem ntau sab laug tsis pleev xim nrog ib tug pickled thiab passivated polish los txhim kho cov passive txheej. Stainless hlau tus du, tsis yog - ntxeem tau nto kuj ua rau nws yooj yim los ntxuav thiab ntxuav hauv cov zaub mov, tshuaj los yog cov ntawv thov huv.

Carbon Steel piv rau Stainless Plhaub PTFE Exchanger: Tsis cuam tshuam rau sab hauv Corrosion kuj
Nws yog ib qho tseem ceeb uas yuav tsum nco ntsoov tias kev xaiv ntawm carbon steel vs stainless hlau plhaub rau PTFE exchanger tsis cuam tshuam rau corrosion kuj ntawm cov wetted feem. PTFE hlab, tubesheets thiab tej fluoropolymer liners yog lig tiv thaiv los ntawm cov txheej txheem kua. Cov kua dej sab hauv tsuas pom PTFE seb lub plhaub yog carbon steel lossis stainless hlau. Qhov kev xaiv yog li txiav txim siab tag nrho los ntawm ib puag ncig sab nraud thiab tus nqi.

Qee zaum qhov kev sib txawv no tsis meej pem. Xaiv lub plhaub stainless hlau rau PTFE exchanger tsis txhim kho cov tshuaj tiv thaiv sab hauv. Nws tsuas txhim kho lub plhaub lub peev xwm los tiv thaiv sab nraud corrosion. Txawm li cas los xij, txheej txheej zoo ntawm lub plhaub carbon steel tuaj yeem ua tau zoo nyob rau hauv ib puag ncig zoo sab hauv.

Lwm yam kev txiav txim siab: Qhov hnyav, Thermal Expansion thiab soj ntsuam
Nyhav - Carbon steel thiab stainless hlau yuav luag sib npaug ntawm qhov ntom. Rau lub plhaub ntawm tib lub thickness thiab txoj kab uas hla qhov sib txawv ntawm qhov hnyav yog tsawg. Tab sis yog tias lub plhaub carbon steel yuav tsum muaj txheej txheej sab nraud (xws li cov dej num hnyav epoxy) tag nrho qhov hnyav tuaj yeem ntau dua me ntsis. Nyob rau hauv cov nqe lus tswv yim qhov hnyav yog tsis tshua muaj teeb meem nyob rau hauv kev xaiv ntawm ob cov ntaub ntawv.

Thermal expansion - Carbon steel thiab stainless hlau muaj cov thermal expansion coefficients zoo sib xws (carbon steel ~ 12 × 10-6 / degree, stainless hlau ~ 17 × 10-6 /℃). Qhov kev hloov pauv tsis tseem ceeb piv rau qhov nthuav dav ntawm PTFE sab hauv qhov chaw (uas yog them rau los ntawm cov txheej txheem mounting raws li cov ncauj lus kom ntxaws hauv cov lus dhau los). Plhaub cov ntaub ntawv nthuav tawm tsis yog qhov tseem ceeb tsim.

Kev tshuaj xyuas thiab kev saib xyuas - Stainless hlau plhaub tuaj yeem pom qhov muag tshuaj xyuas kev xeb yam tsis tau tshem tawm cov xim Cracks lossis pitting tau yooj yim pom meej ntawm cov hlau raug. Carbon steel shells nrog opaque coatings yog qhov nyuaj dua rau kev ntsuas rau lub xeev ntawm cov hlau hauv qab. Xeb staining tej zaum yuav yog thawj qhov qhia ntawm txheej deterioration.

Kev Taw Qhia Kev Txiav Txim: Plhaub hauv Carbon Steel lossis Stainless Hlau
Qhov sib txawv tseem ceeb tau muab sau tseg hauv cov lus hauv qab no:

Feature Carbon Steel Plhaub 304/316 Stainless Hlau Casing
Tus nqi pib (tus txheeb ze) Lub hauv paus (hauv qab) Siab dua (3–5 × tus nqi ntawm cov khoom)
Resistance rau sab nraud corrosionUncoated, ib leeg yog neeg pluag, xav tau xim los yog lwm yam kev tiv thaiv.Zoo. Tej zaum yuav muab tsis tau pleev xim.
Txheej/upkeep needPeriodic checking of painting or coating needMinimal. Qee zaus tu/passivation.
Zoo meej rau qhov chaw ntub dej lossis ntug hiav txwv tsis zoo heev tshwj tsis yog tias muaj coated txaus thiab khaws cia zoo heev
Haum rau cov nroj tsuag tshuaj lom neeg huab cua (acidic vapours) Tsis zoo tsis muaj txheej txheej zoo Zoo rau qhov zoo (316 pom zoo rau chlorination)
Sab hauv tsev, qhuav thiab tswj ib puag ncig haum zoo ntawm cov xim yooj yimOver- specification (tsis xav tau nqi)
Zoo rau thaj chaw ntxhua khaub ncaws lossis chaw sab nraum zoov tsis pub dhau (xav tau lub luag haujlwm hnyav thiab tshuaj xyuas ntau zaus) Xaiv
Qhov cuam tshuam rau corrosion kuj tsis pub dhau
Cov ntawv thov kev tiv thaiv kev sib tsoo kev teeb tsa sab hauv tsev cov txheej txheem cov nroj tsuag nrog cov huab cua qhuav tawm sab nraum zoov, cov chaw hauv hiav txwv, cov chaw tsim tshuaj lom neeg nrog cov vapors hnyav, khoom noj khoom haus / chav huv.
Cov lus qhia rau kev xyaum
Carbon steel plhaub pleev xim rau cov khoom siv epoxy lossis polyurethane xim muaj tus nqi - siv tau zoo rau sab hauv tsev, tswj cov xwm txheej uas qhov sib pauv tau tiv thaiv los ntawm nag, noo noo thiab tshuaj vapors. Cov xwm txheej zoo li no muaj nyob rau hauv ntau qhov chaw ua tiav kev lag luam thiab tshuaj lom neeg kev lag luam. Nrog kev saib xyuas zoo, lub plhaub carbon steel yuav muaj sia nyob rau 15 txog 20+ xyoo.

Stainless hlau plhaub yog tsim nyob rau hauv lub installation ntawm sab nraum zoov, nyob rau hauv lub ntug dej hiav txwv, los yog nyob rau hauv ib qho chaw uas cov huab cua muaj acid vapors (xws li pickling kab, electroplating khw los yog pov tseg acid kho thaj chaw). Tus nqi ntxiv ntawm stainless ua rau kev txiav txim siab thaum lwm txoj hauv kev yuav ua rau lub sijhawm rov ua dua, muaj kev pheej hmoo ntawm kev zais corrosion, lossis lub sijhawm poob rau lub plhaub hloov.

Rau cov xwm txheej hnyav heev, xws li cov huab cua hauv hiav txwv lossis thaj chaw uas muaj cov tshuaj chloride siab (xws li nyob ze hydrochloric acid cia lossis pickling tso tsheb hlau luam), siv hom 316 stainless hlau es tsis yog Hom 304. Hom 316 muaj molybdenum, uas txhim kho nws cov tshuaj tiv thaiv chloride-induced pitting thiab crevice corrosion.

Ib qho kev xaiv tsawg dua yog qhia lub plhaub carbon steel nrog hnyav -cov tshuaj lom neeg lub luag haujlwm- resistant liner rau sab nraud (piv txwv li, ob- ntu epoxy lossis txawm tias PTFE- raws li txheej). Cov txheej zoo li no tseem kim heev, thiab tuaj yeem nyob ze rau tus nqi ntawm lub plhaub stainless, tab sis tseem yuav raug kev puas tsuaj rau txhua yam.

Xaus: Kev txiav txim siab raws li ib puag ncig sab nraud
Tsuas yog qhov sib txawv ntawm PTFE cua kub exchanger nrog lub plhaub carbon steel thiab ib qho nrog lub plhaub stainless hlau yog txiav txim siab los ntawm kev teeb tsa sab nraud thiab kev txwv nyiaj txiag. Cov txheej txheem kua dej chemistry tsis yog qhov tseem ceeb rau qhov kev txiav txim siab no vim PTFE wetted qhov chaw muab kev tiv thaiv kev tiv thaiv sab hauv los ntawm cov khoom siv plhaub.

Carbon steel plhaub yog qhov tsawg tshaj plaws pib nrog, tab sis yuav tsum tau coated sab nraud thiab khaws cia tsis tu ncua kom tsis txhob xeb hauv cov huab cua ntub lossis tshuaj lom neeg. Stainless hlau plhaub yog kim dua pem hauv ntej, tab sis muaj kev tiv thaiv zoo dua sab nraud, feem ntau tshem tawm qhov xav tau rau kev tu txheej txheem txuas ntxiv. Holistic khoom specification yuav siv sij hawm mus rau hauv tus account lub sab hauv thiab sab nraud kev pab cuam. Xaiv cov khoom siv plhaub kom raug rau PTFE cov khoom siv hluav taws xob tau lees paub tias tag nrho cov khoom sib dhos, tsis yog cov khoom siv fluoropolymer xwb, tuaj yeem ncav cuag nws lub neej tag nrho.