Yuav ua li cas tag nrho -Fluoropolymer Thaum tshav kub kub Exchangers piv rau Hlau Exchangers nrog Fluoropolymer Linings?

Rau corrosive lub luag hauj lwm thaum lub siab los yog kub tshaj qhov txwv ntawm cov khoom fluoropolymer, ib tug hlau tshav kub exchanger lined nyob rau hauv nrog fluoropolymer yog ib qho kev cuam tshuam. Kev lag luam tawm - tawm ntawm kev cia siab, nqi thiab kev ua haujlwm ntawm cov txheej txheem no dhau ntawm tag nrho -fluoropolymer exchanger tau tham txog. Cov kev tsis sib xws no yog qhov tseem ceeb heev rau cov txheej txheem engineers uas tsim cov khoom siv hluav taws xob hloov mus rau cov kua qaub heev, cov kab sib xyaw cov kua qaub los yog cov tshuaj lom neeg nyuaj.

Hom Kev Tsim Kho: Yuav Ua Li Cas Tiv Thaiv Fluoropolymer Corrosion hauv 2 Txoj Kev
Txhua yam -fluoropolymer heat exchangers yog tsim los ntawm cov khoom siv fluoropolymer nkaus xwb xws li PTFE (polytetrafluoroethylene), PFA (perfluoroalkoxy alkane) lossis FEP (fluorinated ethylene propylene). Cov khoom fluoropolymer yog siv rau lub plhaub (yog tias muaj), lub hnab ntim khoom, cov ntawv raj thiab txhua qhov ntub dej sab hauv. Cov kev teeb tsa feem ntau yog lub plhaub - thiab - raj (PTFE lossis PFA tubing) thiab immersion coils. Tsis muaj hlau qhov chaw kov cov txheej txheem corrosive kua.

Fluoropolymer-lined hlau exchangers muaj ib lub plhaub hlau uas tuav lub siab thiab cov ntawv raj uas ua los ntawm cov hlau, stainless hlau, los yog lwm yam alloys. Tom qab ntawd cov chaw sab hauv uas tau kov nrog cov kua dej corrosive yog kab nrog fluoropolymer, feem ntau PTFE lossis PFA. Cov txheej txheem hauv ob sab phlu:

Daim ntawv hauv ob sab phlu: PTFE nplooj ntawv yog welded los yog glued rau cov hlau substrate.

Txau los yog electrostatic txheej: Thinner fluoropolymer txheej yog siv thiab sintered.

Loose hauv ob sab phlu: Ib lub thom khwm PTFE tshem tau nyob rau hauv lub plhaub hlau.

Hauv ob sab phlu yog feem ntau 0.5 mus rau 1.5 millimeters, raws li daim ntawv thov thiab liner hom.

Kev ntsuas siab: Qhov txiaj ntsig loj ntawm Lined Hlau Exchangers
Qhov sib txawv tseem ceeb tshaj plaws ntawm ob lub tshuab yog lawv lub peev xwm tswj tau siab.

Lub siab ntawm tag nrho -fluoropolymer exchangers yog txwv los ntawm lub zog txhua yam ntawm fluoropolymer nws tus kheej. PTFE thiab PFA muaj lub zog tensile tsawg (feem ntau 20-30 MPa) thiab, qhov tseem ceeb tshaj, qhia tau tias nkag mus (txias ntws) nyob rau hauv kev txhawb nqa. Thaum lub zog siab dua, cov fluoropolymer yuav deform, ua rau lub raj tawg, lub raj xaim lossis lub plhaub tawg. Cov kev ua tau zoo tshaj plaws ntawm kev ua haujlwm siab ntawm tag nrho cov fluoropolymer plhaub- thiab - tube exchangers yog 3-5 bar (45-75 psi) ntawm sab fluoropolymer. Qee cov qauv tsim tshwj xeeb tau txais mus rau 7 bar, txawm tias cov no tsis tshua muaj.

Lined hlau exchangers, ntawm qhov tod tes, nyob ntawm seb cov hlau plhaub thiab tubesheets kom muaj siab. Cov pa roj carbon steel tuaj yeem ruaj ntseg tuav cov kev ntxhov siab ntawm 10 bar, 20 bar lossis ntau dua, tsuas yog txwv los ntawm tus qauv tsim (xws li ASME Tshooj VIII) thiab flange ratings. Lub fluoropolymer liner tsis yog nyob ntawm qhov kev ua haujlwm ntawm kev ncaj ncees, nws tsuas yog kev tiv thaiv corrosion xwb. Hauv kev pabcuam siab acid xws li refineries, tshuaj nroj tsuag lossis siab siab hydrochloric acid scrubbers lined exchangers feem ntau yog tib qho kev xaiv tsis yog -hlau.

Kub txwv; Qhov tseem ceeb sib txawv thiab zoo sib xws
Qhov siab tshaj qhov ntsuas kub tsis tu ncua ntawm fluoropolymer nws tus kheej zoo ib yam rau txhua tus -fluoropolymer thiab lined fluoropolymer exchangers. Tshaj li ntawm 200℃(392℃F) rau PFA thiab 260℃(500℃F) rau PTFE, PTFE thiab PFA pib soften thiab creep considerably nyob rau hauv luv luv exposures. Tab sis qhov ua tau zoo tas li qhov kev pabcuam kub qis dua:

Tag nrho cov fluoropolymer exchangers: Feem ntau txwv rau 110-120℃rau PTFE (vim mus nkag rau hauv lub raj siab sib txawv) thiab 150-180℃rau PFA (vim phab ntsa thickness thiab txhawb tsim).

Lined hlau exchangers: Lub liner yog txhawb los ntawm cov hlau substrate, yog li nws kim heev deformation yog zam. Lawv tuaj yeem ua haujlwm ntawm qhov kub thiab txias dua. Lub PTFE-lined steel exchangers feem ntau siv ntawm 180-200℃(nruam) thiab mus txog 230℃rau lub sijhawm luv. Lub liner permeation thiab liner adherence rau cov hlau ua lub limiting caij.

Nws yuav tsum tau muab sau tseg tias nyob rau hauv siab kub tag nrho cov fluoropolymers qhia enhanced permeability rau tej gases thiab me me molecules (xws li chlorine, hydrogen chloride). Lined exchangers muaj qhov pheej hmoo ntxiv ntawm vapor permeation los ntawm cov liner condensing ntawm cov hlau sib cuag uas tuaj yeem ua rau muaj kev cuam tshuam tsis zoo.

Corrosion Reliability: Uniform Protection lossis Liner Failure Risk
Txhua yam -fluoropolymer exchangers muab ib yam, tsis tu ncua corrosion kuj nyob rau tag nrho cov wetted nto. Tsis muaj seams, pinholes los yog interfaces ntawm cov hlau raug rau cov txheej txheem kua. Cov fluoropolymer yog sib xws nyob rau hauv lub thickness ntawm phab ntsa. Txawm hais tias qhov chaw yog scraped los yog abraded, cov khoom hauv qab yog tseem chemically resistant. Qhov kev tsim no zam qhov txaus ntshai ntawm "pob txha corrosion" hauv qab liner.

Lined hlau exchangers muaj ib tug xov tooj ntawm tsis ua hauj lwm scenarios uas tsis muaj nyob rau hauv tag nrho cov -fluoropolymer designs:

Pinholes los yog voids nyob rau hauv ob sab phlu - txawm me me imperfections (tsawg dua 0.1 hli) cia corrosive kua nkag mus rau hauv cov hlau substrate. Corrosion khoom yuav ua rau blistering los yog debonding ntawm lub liner tom qab cov hlau pib corroding, uas yuav ua rau kom ceev tsis ua hauj lwm.

Liner debonding - Kev sib txuas ntawm cov fluoropolymer liner thiab hlau substrate yeej tsis zoo tag nrho. Thermal cycling tuaj yeem cuam tshuam qhov sib txawv (PTFE nthuav dav ~ 7 × ntau dua li cov hlau raws li tau hais hauv ntu ua ntej) uas tuaj yeem ua rau lub liner rub tawm ntawm phab ntsa. Qhov chaw tshwm sim tuaj yeem nkag mus rau cov kua qaub permeating thiab ua rau muaj kev tawm tsam hauv zos.

Permeation thiab condensation - Qee cov kua qaub (tshwj xeeb yog HCl ntawm qhov kub siab) infiltrate lub nyias nyias. Yog tias lub plhaub hlau txias dua li cov txheej txheem sab (raws li feem ntau yog cov haujlwm hauv cov haujlwm txias), cov kua qaub nkag mus rau ntawm cov hlau saum npoo uas ua rau corrosion los ntawm 'sab hauv tawm'. Qhov no yog hom tsis ua hauj lwm hauv PTFE lined steel khoom.

Kev puas tsuaj hauv kev pabcuam lossis thaum lub sijhawm teeb tsa lossis kev saib xyuas - Liners tuaj yeem yooj yim txiav, khawb lossis khawb los ntawm cov cuab yeej. Ib qho kev khawb tob tuaj yeem yog lub sijhawm pib ntawm kev ua tsis tiav.

Hauv qhov tseeb, qhov teeb meem loj nrog cov khoom sib hloov yog qhov me me tsis pom qhov pinhole yuav ua rau muaj kev puas tsuaj loj nyob rau hauv ib lub lis piam lossis ntau lub hlis, thaum tag nrho cov fluoropolymer exchanger yuav muaj peev xwm mus txuas ntxiv kev nyab xeeb. Xwb, tus kws tshaj lij tsim khoom thiab tswj xyuas kom zoo tuaj yeem muab kev pabcuam ntau xyoo ntawm kev kub ntxhov thiab kub tsis tuaj yeem nrog cov khoom siv fluoropolymer.

Kev sib piv tus nqi Pib nqis peev thiab lub neej- kev txiav txim siab txog lub voj voog
Rau qhov tsis tshua muaj siab, tsis tshua muaj haujlwm kub, txhua yam -fluoropolymer heat exchangers feem ntau pheej yig dua los tsim. Cov ntaub ntawv (PTFE los yog PFA raj, nplooj ntawv) feem ntau pheej yig tus nqi. Fabrication yuav tsum tau kub sealing los yog vuam ntawm fluoropolymer Cheebtsam.

Hlau exchangers nrog tubing yog kim dua los tsim. The metal shell and tube sheets must be made to pressure vessel codes and then lined with fluoropolymer – a labour-intensive process involving expert workers, quality control (spark testing for pinholes) and specialised welding of fluoropolymer sheets. Raws li qhov tshwm sim, tus nqi pib ntawm kev yuav khoom ntawm ib kab sib pauv yog 30-100% ntau dua li tag nrho -fluoropolymer exchanger ntawm tib lub tshav kub hloov chaw.

Txawm li cas los xij, rau cov ntawv thov siab (piv txwv li . 10 bar lossis siab dua) ib qho tag nrho -fluoropolymer exchanger tej zaum yuav tsis ua txhua yam. Nyob rau hauv cov ntaub ntawv no, ib qho kev xaiv yog ib tug lined exchanger - los yog ib tug metallic alloy exchanger. Tus nqi sib piv ces txav mus rau cov kab fluoropolymer tiv thaiv kab txawv (titanium, tantalum, Hastelloy). Qhov kev sib piv no feem ntau qhia tau hais tias cov kab fluoropolymer yog ib qho kev txuag nyiaj loj.

Cov ntsiab lus sib piv - Hlau Exchanger Nrog Tag Nrho-Fluoropolymer thiab Fluoropolymer Lineing FeaturesAll Fluoropolymer ExchangerFluoropolymer-lined hlau tshav kub exchanger
Kev ntsuas siab 3-5 bar (tso los ntawm fluoropolymer creep) 10-20 bar + (txheej txheem los ntawm lub plhaub hlau tsim code)
Qhov kub siab tshaj plaws tsis tu ncua 110-120℃(PTFE); 150-180℃(PFA) 180-200℃(PTFE liner nrog hlau txhawb)
Corrosion resistance Zoo heev, kev tiv thaiv zoo ib yam, tsis muaj hlau rau corrode Zoo tab sis muaj peev xwm ntawm pinholes, delamination thiab permeation corrosion
Nyob rau hauv cov ntaub ntawv ntawm cov teeb meem liner, tsis ua hauj lwm moden / a (tsis muaj liner) Fast hlau corrosion Muaj peev xwm ua rau muaj kev puas tsuaj loj
Kev ntsuam xyuas thiab kev soj ntsuam kev pom thiab hluav taws xob txuas ntxiv (yooj yim) Xav tau kev kuaj kab hluav taws xob (pinhole identification). Yuav xav tau kev tso siab tsis tu ncua.
Thawj tus nqi qis qis rau cov dej num uas tsis tshua muaj siab Ntau (lub nkoj siab + cov neeg ua haujlwm hauv ob sab phlu)
Kev saib xyuas kev pheej hmoo tsawg; tsis muaj liner hloov nruab nrab mus rau siab; liner tej zaum yuav puas thaum kho
Cov ntawv thov cua sov / cua txias ntawm electroplating, atmospheric acid scrubbers, tsis tshua muaj siab pickling da dejHigh-pressure HCl coolers, kub exchangers rau concentrated acid nyob rau hauv refineries, tshuaj reactors.
Daim Ntawv Qhia Txog Kev Txiav Txim: Yuav Ua Li Cas Xaiv Cov Tshuab Zoo
Kev txiav txim siab los siv tag nrho -fluoropolymer lossis cov khoom siv hlau sib txuas yuav tsum yog raws li qhov xav tau ntawm lub siab thiab qhov kub thiab txias thiab qhov ua tau zoo ntawm kev pheej hmoo tsis ua haujlwm.

Xaiv ib qho tag nrho -fluoropolymer heat exchanger yog:

Ua haujlwm siab tsawg dua 5 bar (75 psi).

Kub yog qis dua 120℃(PTFE) lossis 180℃(PFA).

Kev ntseeg siab ntawm corrosion yog qhov tseem ceeb. Tsis muaj pinhole lossis liner tsis ua haujlwm raug zam.

Cov txheej txheem kua dej yog oxidising acids los yog tov kua qaub thiab me ntsis kev sib cuag nrog hlau yuav ua rau tsis ua hauj lwm sai.

Tus nqi pib qis dua yog xav tau.

Lub exchanger yog nyob rau hauv ib qho chaw uas tsis tau txais (piv txwv li saum toj no rhiab khoom siv los yog nyob rau hauv ib tug huv chav tsev).

Thaum xaiv cov hlau kub exchanger nrog ib lub fluoropolymer hauv ob sab phlu:

Kev ua haujlwm siab yog siab dua 5 bar thiab tuaj yeem siab dua 20 bar lossis siab dua.

Qhov ntsuas kub tsawg dua 200℃thiab siab dua 120 degree

Cov txheej txheem kua dej yog tus cwj pwm txaus thiab tsis muaj hom kab mob uas ua rau cov kab permeability nce ntxiv (xws li HCl roj kub).

Muaj ib qho kev tshuaj xyuas nruj thiab kev saib xyuas uas cuam tshuam nrog kev kuaj lub sijhawm ntawm lub liner.

Exotic hlau alloys (titanium, tantalum) yog kim heev, yog li cov hlau lined yog ib qho kev xaiv zoo.

Qee lub caij nyoog ntawm cov kab tsis ua hauj lwm raug tso cai yog tias tsis muaj kev ruaj ntseg cov cuab yeej raug teeb tsa (kev tshawb nrhiav pom, qhov chaw thib ob).

Lined PTFE exchangers yog ib qho kev daws teeb meem rau cov kev pabcuam siab acid uas yog cov chaw tsim khoom thiab cov chaw siv tshuaj loj, xws li hydrochloric acid coolers ntawm 10 bar thiab 150 degree. Feem ntau, txawm li cas los xij, nruab cov khoom siv hluav taws xob (cov khoom siv hluav taws xob sib txuas ntawm cov kab thiab lub plhaub) kom ceeb toom ntxov ntawm kev ua txhaum cai liner.

Xaus: Kev ntseeg siab thiab kev nyab xeeb yuav tsum Direct the Choice
Txhua yam -fluoropolymer tshav kub exchangers cais cov hlau los ntawm txoj kev wetted kom ntseeg tau tias corrosion ntau tshaj. Tsis muaj debond hauv ob sab phlu, tsis muaj corrosion pinhole thiab tsis zais hlau substrate kom tawg. Tab sis lawv qhov siab thiab qhov kub thiab txias yog me me.

Fluoropolymer-lined hlau exchangers yog muab nrog lub plhaub hlau uas tso cai rau kev ua haujlwm ntawm kev kub siab thiab kub. Kev lag luam tawm yog tias nws yog qhov nyuaj dua, kim dua los pib, thiab qhia cov kev ua tsis tiav tshiab -pinholes, debonding, permeation- uas tsis muaj nyob rau hauv tag nrho -fluoropolymer designs.

Cov txheej txheem engineers yuav tsum xav txog cov kev lag luam no - tawm kom zoo. Tag nrho -fluoropolymer exchangers feem ntau yog cov tshuaj zoo tshaj plaws rau kev siv tsis tshua muaj siab, muaj kev ntseeg siab. Kev tswj xyuas kom zoo, kev tshuaj xyuas thiab kev xau kom paub tseeb yog qhov tsim nyog rau kev kub siab, kev ua haujlwm kub kub uas cov kab fluoropolymer yog tib qho kev xaiv tsis yog xim hlau. Qhov kev txiav txim siab tsim qauv tseem ceeb no yuav tsum tau tsav los ntawm cov txheej txheem kev nyab xeeb thiab kev ntseeg tau, kom ntseeg tau tias cov tshuab hluav taws xob xaiv hluav taws xob tau tsim nyog rau cov xwm txheej tshwj xeeb thiab kev ua haujlwm ntawm cov txheej txheem tshuaj.