Hauv lub plhaub - thiab - raj kub exchanger, cov hlab yuav raug teeb tsa raws li kev khiav ncaj nraim ntawm ob lub raj ntawv, lossis khoov rau hauv U- cov duab nrog ob qhov kawg ruaj ntseg hauv ib lub raj ntawv. Qhov zoo li yooj yim geometric sib txawv no muaj qhov cuam tshuam loj rau kev tswj hwm kev ntxhov siab thiab kev saib xyuas. Rau PTFE tshav kub exchangers, qhov twg lub polymer lub siab coefficient ntawm thermal expansion (CTE) thiab chemical inertness yog cov cuab tam tseem ceeb, kev xaiv ntawm ib tug U- raj thiab ib tug ncaj- raj bundles ncaj qha cuam tshuam rau ntev - lub sij hawm cia siab rau thiab serviceability nyob rau hauv nto finishing thiab tshuaj txheej txheem ib puag ncig.
Txheej txheem cej luam ntawm Ob Lub Pob Teeb Meem
Ncaj-Tube PTFE Bundle
Nyob rau hauv ib tug ncaj-tube pob, ib tug PTFE hlab khiav nyob rau hauv txoj kab ncaj nraim los ntawm ib tug inlet tubesheet mus rau lub qhov hluav taws xob tubesheet nyob rau hauv opposite kawg ntawm lub plhaub. Ob qhov kawg ntawm txhua lub raj yog tsau (dov, flared, los yog welded) rau hauv cov ntawv raj. Lub plhaub ntim cov raj, thiab cov dej ua haujlwm (kub cua sov lossis cua txias nruab nrab) ntws ntawm lub plhaub sab, thaum cov txheej txheem dej ntws hauv cov hlab ntsha (los yog vice versa).
Vim tias cov raj thiab lub plhaub yog ua los ntawm cov khoom sib txawv (PTFE piv rau hlau lossis FRP) thiab ua haujlwm ntawm qhov sib txawv, qhov sib txawv thermal expansion tshwm sim. Txhawm rau tiv thaiv kev ntxhov siab ntau dhau ntawm cov hlab ntsha, cov hlab ntsha, lossis lub plhaub, ib qho ncaj - cov hlua khi feem ntau yuav tsum muaj lub taub hau ntab ntawm ib kawg lossis ib qho kev sib koom ua ke hauv lub plhaub. Qhov kev nyuaj ntxiv no ua rau tus nqi nce ntxiv thiab nthuav qhia txoj hauv kev tuaj yeem.
U-Tube PTFE Bundle
Hauv U-tube pob, txhua lub PTFE raj yog khoov rau hauv U-puab. Ob qhov kawg ntawm tib lub raj yog ruaj ntseg nyob rau hauv ib tug tib tubesheet ntawm ib kawg ntawm lub exchanger. Qhov khoov yog nyob ntawm qhov kawg ntawm lub plhaub. Qhov kev tsim no tshem tawm qhov xav tau ntawm lub raj thib ob, lub taub hau ntab, lossis kev sib koom ua ke. U- cov raj zoo li yog pub dawb los nthuav thiab cog lus ib tus zuj zus raws li qhov kub thiab txias hloov, vim qhov khoov ua raws li lub caij nplooj ntoos hlav hloov tau.
U-Tube bundles yog tshwj xeeb tshaj yog muaj nyob rau hauv PTFE tshav kub exchangers vim PTFE yog ob leeg saj zawg zog thiab muaj ib tug siab CTE (kwv yees li 10-20 npaug ntawm cov hlau). Cov khoom siv tau yooj yim tso cai nruj dua U- khoov dua li cov hlau, thaum nws cov coefficient nthuav dav ua rau thermal stress nyem qhov tseem ceeb.
Qhov sib txawv tseem ceeb hauv kev tsim kho tshuab thiab kev ua haujlwm
Qhov kev txiav txim siab ntawm aU tube vs ncaj raj PTFE tshav kub exchangerbundle suav nrog kev lag luam tawm - tawm hauv cov kev pabcuam kev ntxhov siab, kev ua kom huv, kev ncaj ncees, thiab kev thov kom haum.
Thermal Stress Chaw nyob
PTFE muaj ib tug linear coefficient ntawm thermal expansion ntawm kwv yees li 120-150 × 10⁻⁶ /℃(piv txog li 11 × 10⁻⁶ /℃rau carbon steel). Lub PTFE raj uas yog 2 meters ntev ntawm 20℃yuav nthuav dav li ntawm 12-15 hli thaum rhuab mus rau 100 degree. Nyob rau hauv ib tug ncaj-tube bundle tsau ntawm ob qho kawg, qhov kev nthuav dav no yuav tsim kom muaj zog compressive uas tuaj yeem buckle cov hlab PTFE lossis ua rau cov pob qij txha puas.
U-tube pob:Lub U- khoov absorbs nthuav dav. Raws li lub raj cua sov thiab ua kom ntev, qhov khoov qhib me ntsis, thiab ob txhais ceg ntawm U swb los ntawm kev txhawb nqa tubesheet (los yog lub tubesheet nws tus kheej txav me ntsis). Tsis tas yuav tsum muaj kev sib txuas sab nraud. Qhov kev them nyiaj yug los no ua rau U-tube pob khoom muaj kev ntseeg siab zoo nyob rau hauv thermal cycling.
Ncaj-tube pob:Yog tsis muaj kev sib koom ua ke los yog lub taub hau ntab, ncaj nraim - raj PTFE pob yuav ua tsis tau sai nyob rau hauv thermal cycling. Thaum cov pob khoom no tau teev tseg, lawv yuav tsum suav nrog lub raj xa dej ntws (tso cai rau axial txav) lossis lub hauv siab - hom expansion sib koom ua ke ntawm lub plhaub. Cov khoom no ntxiv kev txhawj xeeb txog tus nqi thiab kev saib xyuas.
Hauv cov ntawv thov nrog kev caij tsheb kauj vab ntau zaus-xws li cov txheej txheem batch uas lub da dej sov thiab txias txhua hnub-U- raj pob khoom yog qhov nyiam heev.
Cleanability thiab Fouling Management
Qhov teeb meem tseem ceeb tshaj plaws ntawm U-tube pob yog qhov tsis muaj peev xwm ua kom huv si sab hauv ntawm U- khoov. Sab hauv ntawm U- lub raj zoo li lub raj tsis tuaj yeem nkag tau nrog cov txhuam ncaj, lance, lossis cov cuab yeej hydroblast vim qhov khoov thaiv kev nkag mus ntawm cov cuab yeej tu tawv.
Ncaj-tube pob:Ob qhov kawg ntawm txhua lub raj siv tau. Cov txheej txheem tu neeg kho tshuab-xws li txhuam hlau, cov tshuaj ntxuav lub raj xa dej, siab - lub tshuab nqus dej siab, thiab txawm tias laum shafts - tuaj yeem dhau los ntawm lub raj. Rau cov kev pabcuam uas tsim cov nplais tawv, crystalline deposits, lossis cov organic fouling, kev tu txhua yam feem ntau yog tib txoj kev ua tau zoo.
U-tube pob:Kev ntxuav yuav tsum tau ua chemical. Cov tshuaj ntxuav yog circulated los ntawm lub raj sab kom yaj los yog loosen deposits. Rau ntau daim ntawv thov nto (piv txwv li, npib tsib xee plating da dej qhov twg cov deposits yog mos los yog soluble), tshuaj ntxuav yog txaus. Rau cov kev pab cuam uas cov deposits nyuaj los yog insoluble (xws li, calcium sulfate scale los ntawm cov dej txias), tsis muaj mechanical cleanability yuav ua tau ib tug deal-breaker.
Rau cov kev pabcuam cuam tshuam rau fouling, tshwj xeeb tshaj yog nyob rau sab raj, qhov ncaj -tube pob muaj qhov kom zoo dua. Txawm li cas los xij, yog tias cov txheej txheem dej huv huv lossis yog tias cov khoom tso tawm tau raug tshem tawm, U-tube tsim tseem siv tau.
Leak Paths thiab Reliability
Txhua tubesheet sib koom ua ke yog qhov muaj peev xwm xau taw tes. Nyob rau hauv ib tug ncaj-tube nras, muaj ob tubesheets, txhua tus muaj ntau lub raj - mus rau -tubesheet kev sib txuas. Tsis tas li ntawd, lub taub hau ntab los yog kev sib koom ua ke ntxiv gasketed lossis kaw cov pob qij txha.
U-tube pob:Tsuas yog ib daim ntawv tube xwb yuav tsum tau. Tag nrho cov raj xaus nyob rau hauv tib daim ntawv, txo tus naj npawb ntawm cov ntsiab lus xau los ntawm ib nrab. Qhov kawg kaw ntawm U (qhov khoov) tsis muaj kev sib koom ua ke. Rau cov kev pabcuam corrosive uas txawm tias me me ntawm cov xau tsis tuaj yeem lees txais, U-tube tsim yog qhov muaj kev ntseeg siab dua.
Ncaj-tube pob:Ob lub tubesheets muab ob npaug ntawm cov raj sib txuas. Lub taub hau ntab los yog kev sib koom ua ke nthuav qhia ntxiv cov ntsaws ruaj ruaj uas tuaj yeem ua tsis tau raws sijhawm. Txawm li cas los xij, yog tias ib lub raj hauv ib qho ncaj nraim - raj xau, feem ntau nws tuaj yeem txuas tau (los ntawm ob qho kawg) yam tsis tau tshem cov pob. Hauv U-tube pob, ntsaws lub raj xau tseem tuaj yeem ua tau, tab sis kev nkag tau tsuas yog txwv rau tib lub raj xaum kawg.
Bundle Tshem Tawm thiab Hloov
Ob hom pob khoom feem ntau yog tshem tawm ntawm lub plhaub rau kev tshuaj xyuas lossis hloov. Txawm li cas los xij, U- raj pob khoom feem ntau luv dua (vim tias cov hlab ntim rov qab rau lawv tus kheej) thiab tej zaum yuav yooj yim dua los ntawm lub plhaub. Txoj kab ncaj nraim -tube pob yuav tsum tau tshem tawm ntawm ob sab ntawm lub plhaub kom tshem tawm cov hlua khi, uas ua rau kom tag nrho cov hneev taw ntawm qhov sib pauv.
Rau PTFE exchangers, lub nra hnyav yog tsawg piv rau hlau bundles, yog li kev tshem tawm logistics tsis tshua muaj qhov txwv.
Cov lus sib piv: U-Tube vs. Ncaj-Tube PTFE Bundle
| Feature | U-Tube Bundle | Ncaj-Tube Bundle |
|---|---|---|
| Thermal Expansion Chaw nyob | Inherent – U- khoov ua raws li lub caij nplooj ntoos hlav hloov tau; tsis xav tau expansion sib koom | Yuav tsum tau ntab taub hau lossis lub plhaub nthuav dav sib koom ua ke los tiv thaiv lub raj buckling |
| Tus naj npawb ntawm Tubesheets | Ib | Ob |
| Number of Tube-rau-Tubesheet Joints | Tsawg dua (ob qho tag nrho hauv tib daim ntawv) | Ob zaug ntau npaum li cas (ib lub raj kawg) |
| Mechanical Cleanability (Tube Sab) | Tsis muaj peev xwm - U- khoov thaiv cov cuab yeej ntxuav tsis tu ncua | Siv tau los ntawm ob qhov kawg; txhuam thiab hydroblasting ua tau |
| Tshuaj Cleanability | Zoo - ncig ntawm cov tshuaj ntxuav tau zoo | Zoo - kuj txhawb kev tu kom huv |
| Muaj peev xwm rau Leak Paths | Lower - ib leeg tubesheet, tsis muaj ntab taub hau ntsaws ruaj ruaj | Siab dua - ob lub tubesheets ntxiv rau kev sib koom ua ke los yog ntab taub hau gaskets |
| Fouling kam rau ua | Tsawg mus rau nruab nrab - tsuas yog muaj tshuaj ntxuav | High - mechanical cleaning tuaj yeem tshem tawm cov khoom nyuaj |
| Bundle Tshem Tawm Ntev | Shorter (folded configuration) | Ntev (tag nrho lub plhaub ntev ntawm ob qho kawg) |
| Hom Tube Khoov Radius | Yam tsawg kawg nkaus 3-5 × raj OD (PTFE tso cai nruj dua hlau) | Tsis siv tau |
| Nqi (rau tib lub tshav kub hloov chaw) | Feem ntau qis dua - kev tsim kho yooj yim, tsawg qhov chaw | Siab dua - cov khoom ntxiv thiab cov pob qij txha |
Kev siv tswv yim hauv kev ua kom tiav thiab tshuaj lom neeg
Thaum twg los xaiv U-Tube PTFE Bundle
U-tube pob yog qhov kev xaiv ua ntej rau ntau lub PTFE cov khoom siv hluav taws xob hauv qhov chaw tiav, tshwj xeeb tshaj yog thaum:
Cov txheej txheem cov kua dej yog huv si los yog fouling yog me me thiab chemically tshem tawm (xws li, dilute acids, alkaline cleaners, plating daws tsis muaj cov khoom particulates).
Kev caij tsheb kauj vab ntau zaus tshwm sim (xws li batch cua sov thiab cua txias).
Compact exchanger hneev taw yog xav tau.
Kev txo qis txoj hauv kev yog qhov tseem ceeb, xws li hauv kev pabcuam cov kua qaub (xws li hydrochloric lossis sulfuric acid ntawm qhov kub siab).
Lub raj sab dej yog cov txheej txheem corrosive, thiab lub plhaub sab yog cov kua dej huv (xws li chav dej lossis dej kub).
Cov ntawv thov: Anodizing da dej rhaub / txias txias, electroless npib tsib xee plating kab (nrog rau tshuaj ntxuav lub sij hawm), thiab corrosive tshuaj reactors.
Thaum twg los xaiv ib qho Ncaj -Tube PTFE Bundle
Ib qho ncaj- raj pob khoom yog nyiam thaum kev tu tshuab yog qhov tseem ceeb. Qhov no suav nrog:
Cov txheej txheem uas tsim cov nplai nyuaj (piv txwv li, calcium carbonate los ntawm cov dej txias lossis cov chrome plating nyuaj da dej qhov twg chromic acid deposits).
Cov kev pabcuam uas cov kua dej sab hauv lub raj muaj cov khib nyiab tshem tawm lossis zoo li crystallize ntawm qhov txias.
Cov khoom sib pauv uas tsis tuaj yeem raug coj mus rau offline rau kev siv tshuaj tua kab mob ntev ntev; Kev tu txhua yam tuaj yeem ua tau sai sai thaum lub sijhawm hloov pauv.
Cov xwm txheej uas ib tus neeg lub raj txuas los ntawm ob qho kawg yog qhov yuav tsum tau muaj kev saib xyuas zoo.
Cov ntawv thov ib txwm: Cov cua sov rov qab los ntawm cov yees txias (scaling peev xwm), cov cua sov ua kom muaj cua sov, thiab qee cov txheej txheem kho cov khib nyiab.
Kev txiav txim siab tshwj xeeb rau cov khoom siv PTFE
PTFE qhov qis modulus ntawm elasticity (softness) thiab siab yooj ua rau nws tshwj xeeb tshaj yog haum rau U- raj siv. Tsis zoo li cov hlau U-tube bundles, uas yuav tsum tau ib tug tsawg kawg nkaus khoov vojvoog ntawm 3-5 × raj txoj kab uas hla kom tsis txhob ua hauj lwm hardening los yog tawg, PTFE tuaj yeem khoov rau radii tsawg li 2-3 × txoj kab uas hla tsis muaj kev puas tsuaj. Qhov no tso cai rau ntau lub raj ntim rau hauv lub plhaub taub.
Txawm li cas los xij, tib qhov yooj yim txhais tau hais tias PTFE cov raj ncaj yuav tsum tau ua tib zoo txhawb nqa kom tsis txhob sagging lossis kev co. Ncaj nraim-tube PTFE pob khoom feem ntau xav tau nruab nrab ntawm cov paib (baffles) ntawm lub sijhawm ze dua li cov raj hlau.
Nws kuj tseem tsim nyog sau cia tias PTFE cov raj muaj qhov cuam tshuam rau kev nkag mus rau hauv cov kev ntxhov siab txhua yam. U-tube tsim, uas zam qhov kev txwv ruaj khov ntawm ob qho kawg, txo qis kev nkag siab- cuam tshuam txog kev so kom txaus piv rau qhov ncaj- raj tsim nrog lub taub hau ntab.
Xaus
Qhov kev xaiv ntawm U- raj thiab ncaj- raj PTFE cov khoom siv hluav taws xob hloov pauv hloov pauv nyob ib puag ncig ob qhov tseem ceeb tshaj plaws: thermal stress nyem thiab huv. U-tube pob khoom siv los them nyiaj rau PTFE lub siab thermal expansion coefficient yam tsis tas yuav muaj cov pob qij txha nthuav dav, thaum muab kev tsim kho yooj yim thiab tsawg dua cov ntsiab lus xau. Cov kab ncaj nraim -tube pob muab tag nrho cov neeg kho tshuab nkag mus rau lub raj sab hauv, ua rau nws tsuas yog kev xaiv rau fouling cov kev pab cuam uas nyuaj deposits yuav tsum tau muab tshem tawm los ntawm txhuam los yog hydroblasting.
Rau feem ntau cov ntaub ntawv tiav qhov chaw tshuaj ntxuav kom txaus thiab thermal cycling yog ib txwm muaj, U-tube pob yog qhov nyiam, tus nqi- siv tau zoo. Rau cov khoom siv hluav taws xob los tuav cov kua dej los yog qhov chaw tsim khoom xav tau kev kho tshuab sai sai, qhov ncaj -tube pob-txawm tias nws qhov nyuaj ntxiv- yog qhov kev xaiv zoo dua. Qhov kev cia siab fouling nyiam thiab thermal cycling zaus yuav tsum coj cov pob khoom xaiv, kom ntseeg tau tias PTFE cov khoom siv hluav taws xob muab kev pabcuam txhim khu kev qha, tswj tau nws lub neej ua haujlwm.
