Yuav Ua Li Cas Xaiv Qhov Kev Txhim Kho Kev Tsim Kho Kom Zoo Rau Ib Lub Tube Sheet PTFE Exchanger Plhaub?

Ib qho ruaj khov -tubesheet PTFE cov khoom siv hluav taws xob yog qhov yooj yim thiab feem ntau nyiam kev lag luam, tab sis tus qauv tsim cuam tshuam nrog cov thermal tsis sib haum xeeb. Lub PTFE hlab nthuav dav heev ntawm qhov kub thiab txias, tab sis lub plhaub ib puag ncig steel nthuav dav me ntsis. Yog tias qhov kev txav txav tsawg, qhov tsis sib haum xeeb tuaj yeem ua rau muaj kev ntxhov siab axial loj heev. Ib feem ntawm lub exchanger yuav tsum khoov kom nqus tau qhov sib txawv expansion. Cov lus teb yog cov hlau bellows expansion sib koom ua ke welded rau hauv lub plhaub - hloov tau, accordion-zoo li ntu uas nthuav dav thiab cog lus raws li PTFE raj bundle thermally ua pa thaum ua haujlwm.

Lub tshuab nqus tsev twj tso kua mis yog ib qho tseem ceeb tshaj plaws ntawm txhua yam khoom siv nyob rau hauv tag nrho cov exchanger system rau ib qho expansion sib koom ua ke ruaj tubesheet PTFE exchanger xaiv.

Vim li cas Expansion Joints xav tau ntawm PTFE Exchangers
PTFE's Extreme Thermal Expansion
Lub thermal expansion coefficient ntawm PTFE yog ntau dua li carbon steel los yog stainless hlau. PTFE hlab tuaj yeem nthuav dav ntau zaus ntawm qhov loj ntawm lub plhaub tsim nyob ib puag ncig lawv nrog kev hloov pauv hauv kev ua haujlwm kub.

Yog tias tsis muaj qhov hloov pauv hloov pauv, cov teeb meem tseem ceeb yuav tshwm sim:

Distortions nyob rau hauv lub tubesheet

Tube rupture

Ntau dhau axial quab yuam

Cracking lub plhaub

Weld qaug zog

Kev ua tsis tiav

Lub expansion sib koom ua ke yog thaj tsam ntawm kev tswj kev txav thiab tsis tso cai rau cov concentration ntawm thermal stresses nyob rau hauv lub exchanger lub cev.

Lub Bellows raws li qhov hloov pauv siab ciam teb
Cov hauv qab no yog cov hlau ntsws ntawm lub exchanger, ua pa tawm hauv thiab tawm nrog txhua lub voj voog thermal, tsis tau tswj xyuas kev ncaj ncees ntawm lub siab barrier. Tsuav yog muaj qhov hloov tau zoo, PTFE raj pob tuaj yeem nthuav dav thiab cog lus ib txwm tsis dhau -txhawb lub plhaub.

Qhov kev hloov pauv no yuav tsum tau tsim kho kom txhob txwm ua, tsis yog ua raws li cov kav dej dav dav.

Cov qauv tsim tseem ceeb rau kev xaiv ntawm kev nthuav dav pob qij txha
Tag nrho kev mus ncig ntawm axial
Qhov tseem ceeb tshaj plaws parameter nyob rau hauv expansion sib koom sizing yog lub peev xwm txav axially. Lub tshuab nqus tsev yuav tsum ua kom muaj kev nyab xeeb ntawm tag nrho cov kev kwv yees thermal nthuav dav vim yog PTFE hlab hla tag nrho cov kev ua haujlwm kub.

Kev xam tsim qauv coj mus rau hauv tus account:

Lub cev ntev

Thermal Expansion Coefficient ntawm PTFE

Pib qhov kub sib txawv

Contraction thaum kaw

Txheej xwm ntxhov siab

Maximum Design Temp (MDT)

luv luv ib txoj kev taug yuav overstretch lub bellows los yog ua tsis ua hauj lwm los ntawm compression qaug zog.

Vim Li Cas Peb Thiaj Li Thick -Walled Single-Ply Bellows
Yuav tsum muaj kev tiv thaiv siab
Rau qhov ruaj khov -tubesheet PTFE exchangers, lub hauv siab yog raug rau lub plhaub sab hauv tab sis kuj muaj peev xwm txav tau. Nyias, ntau-ply bellows, raws li feem ntau ua haujlwm hauv cov kav dej tsis zoo, tej zaum yuav tsis muaj zog txaus rau lub hom phiaj no.

Vim li no feem ntau tuab-phab ntsa ib leeg-ply bellows designs raug saws.

Cov txiaj ntsig muaj xws li:

Ua kom muaj zog ntxiv

Kev Tiv Thaiv Kev Nyab Xeeb Zoo dua

Ua kom muaj kev tiv thaiv corrosion

Kev puas tsuaj zoo dua tuav

Tsawg susceptibility rau ply sib cais

Lub hauv paus sib dhos tsis yog ib qho yooj yim txuas. Nws yog ib feem ntawm cov hlab ntsha siab uas ib txhij ua rau kub, siab thiab qaug zog loads.

Xaiv cov khoom siv Bellows
Yog vim li cas 316L stainless hlau yog li ntawd
Cov khoom siv nrov tshaj plaws rau kev sib hloov plhaub hauv qab yog 316L stainless hlau vim nws muaj kev sib xyaw ntawm:

Kev tiv thaiv corrosion

Kev txawj vuam

Cov yam ntxwv qaug zog

Muaj:

Mechanical bendability

Atmospheric corrosion kuj yog qhov tseem ceeb tshaj plaws vim tias cov hauv qab no feem ntau nyob rau sab nraud ntawm lub plhaub es tsis yog nyob rau hauv kev sib cuag ncaj qha nrog cov txheej txheem chemical.

Sab nrauv Corrosion Hazards
Cov nroj tsuag ib puag ncig uas cov hauv qab no nyob yuav nthuav tawm lawv mus rau:

Acid pa taws

Ntsev- hnyav av noo

Ntxuav cov tshuaj

* Cov txheej txheem nchuav

Kev kis kab mob nrog chloride

Hauv tshwj xeeb cov kab mob chlorides muaj kev phom sij heev vim lawv tuaj yeem ua rau sab nraud kev nyuaj siab corrosion tawg ntawm stainless hlau bellows nyob rau hauv tensile kev nyuaj siab.

Cov txheej txheem xaiv cov khoom yog li yuav tsum xav txog ob qho tib si cov txheej txheem ua haujlwm thiab kev cuam tshuam ib puag ncig ib puag ncig ntawm kev sib hloov pauv.

Design of Fatigue Life and Convolution
Lub luag haujlwm ntawm Convolution Geometry
Convolutions yog cov corrugations uas compress thiab txuas nrog cua sov txav los tsim cov hauv qab yooj yim.

Tus tsim yuav tsum muaj xws li:

Tus naj npawb ntawm convolutions

Convolution qhov siab

Pitch puab

Thickness ntawm phab ntsa

Axial caij nplooj ntoos hlav tsis tu ncua

Muaj ob peb convolutions yuav ua rau nruj heev thiab ntau convolutions yuav ua rau muaj peev xwm tsis tshua muaj siab thiab qaug zog.

Thermal Cycling Teeb meem
Cov khoom sib pauv uas tau pib ntau heev-ups, shutdowns, los yog batch txheej txheem tej yam kev mob yog raug rau rov qab kub cycling ua rau cyclic strain rau cov khoom siv hauv qab.

Rau siab - daim ntawv thov mus ncig, kev qaug zog tiv thaiv kab mob yog tsim nyog.

Lwm yam kev ntsuas engineering yuav suav nrog:

Optimized zoo ntawm lub convolution

Txo cov kev ntxhov siab concentration thaj chaw

Txhim kho kev tswj ntawm weld zoo

Kev txwv kev txav mus los

Tshooj ntawm cov dab tshos muaj zog

Kev qaug zog tsis ua hauj lwm feem ntau tshwm sim los ntawm kev pib tawg ntawm cov hauv paus hniav convolution hnyav heev.

Ua raws li EJMA thiab ASME Standards
EJMA Design Criteria
Expansion joints nyob rau hauv siab retaining exchanger shells yuav tsum tau tsim raws li cov txheej txheem teev tseg los ntawm lub Expansion Joint Manufacturers Association (EJMA).

EJMA txoj hauv kev muab cov lus qhia txog:

xam kev nyuaj siab

Kev txheeb xyuas qhov qaug zog

Kev ntsuas siab

Kev txwv tsis pub txav mus los

Kev kwv yees ntawm lub caij nplooj ntoos hlav quab yuam

Kev kwv yees lub neej voj voog

ASME Cov Ntawv Ntxiv 26
Hauv kev siv lub nkoj siab, ASME Cov Lus Qhia Ntxiv 26 kuj tseem tuaj yeem coj cov qauv hauv qab thiab tso cai rau kev ntsuas kev ntxhov siab.

Kev siv cov qauv tsim qauv pab kom paub tseeb tias qhov sib koom ua ke nthuav dav suav tias yog cov khoom siv siab ua haujlwm siab thiab tsis yog cov khoom siv ntxiv.

Kev tiv thaiv ntawm Bellows los ntawm Mechanical puas
Qhov tseem ceeb ntawm sab nraud shrouds
Kev puas tsuaj sab nraud rau lub tshuab nqus tsev convolutions los ntawm cov cuab yeej, ko taw tsheb, cov khoom poob lossis kev ua haujlwm yuav ua rau muaj qhov tsis zoo.

Yog li ntawd, pawg neeg hauv qab yuav tsum tau haum nrog ib qho kev tiv thaiv sab nraud.

Lub shroud tiv thaiv:

Kev puas tsuaj los ntawm kev cuam tshuam

Kev mob deformation

Cov khib nyiab khib nyiab

Huab cua raug

Hu rau cov neeg ua haujlwm.

Kev tiv thaiv lub cev yog qhov tseem ceeb rau kev cia siab rau lub sijhawm ntev vim tias qhov me me denting lossis deformation tuaj yeem ua rau lub neej qaug zog heev.

Yog vim li cas Off-Lub-Tsheb Expansion Joints tsis ua haujlwm
Engineering Requirements Customized
Ib qho ruaj khov -tubesheet PTFE exchanger ua rau tshwj xeeb thauj khoom ntawm:

High thermal hloov chaw

Siab »

Cyclical loading

Corrosive ib puag ncig raug

Mechanical tshee

Tawm ntawm -- txee piping expansion pob qij txha tsis tshua muaj txaus nyob rau hauv kev pab cuam vim hais tias lawv tsis yog npaj los ua kom tau raws li kev sib koom ua ke thiab kev xav tau ntawm PTFE exchanger service.

Hloov chaw, txhua qhov sib dhos ua ke yuav tsum tau tsim kom haum raws li qhov sib txawv geometry thiab kev ua haujlwm.

Cov ntsiab lus
Qhov kev sib koom ua ke nthuav dav yog qhov txuas txuas txuas txuas txuas ntxiv uas muaj peev xwm kov yeej qhov kev nyuaj siab thermal kev nyuaj siab nrog ib qho ruaj khov -tubesheet PTFE tshav kub exchanger. Lub tshuab ua kom muaj kev nyab xeeb rau qhov kub loj loj sib txawv ntawm cov raj PTFE thiab cov hlau nyob ib puag ncig thiab tiv thaiv kev puas tsuaj rau cov khoom thauj khoom ntawm lub exchanger thaum tswj kev siab ncaj ncees.

Qhov kev xaiv ntawm ib tug ruaj khov tubesheet PTFE exchanger nrog ib tug zoo me me expansion sib koom ua ke yog tshwm sim los ntawm kev ua tib zoo xav txog axial mus txawv tebchaws muaj peev xwm, phab ntsa thickness, convolution geometry, qaug zog tsis kam, corrosion kuj thiab adherence rau EJMA los yog ASME tsim qauv. Qhov tseem ceeb sib npaug rau kev ua haujlwm ntev - lub neej kev pabcuam yog kev tiv thaiv sab nraud thiab kev sib raug zoo ib puag ncig.

Ib qho ntawm cov cuab yeej siv tau zoo tshaj plaws hauv cov khoom siv thermal engineering feem ntau yog ib qho uas tau npaj los ua kom haum rau nws tus kheej lub zog sab hauv nrog kev tshav ntuj, tsis txhob tawm tsam nws nruj.