Yuav ua li cas Bayonet-Style PTFE Thaum tshav kub kub Exchangers txawv los ntawm cov pa ruaj ruaj Tubesheet Designs?

Feem ntau lub plhaub thiab lub raj xa hluav taws xob muaj cov raj txuas ntawm ob qho kawg. Lub bayonet exchanger tig qhov no rau ntawm nws lub taub hau: cov hlab yog tsau ntawm ib kawg nkaus xwb, lwm kawg yog pub dawb rau swb nyob rau hauv ib tug kaw sab nrauv sheath. Qhov kev tsim qauv yooj yim no kov yeej ob qhov ntev -kev txhawj xeeb, kev kub ntxhov thiab kev saib xyuas. Qhov kev npaj bayonet yog ib qho kev sim siab rau kev xav tau qhov chaw tiav thiab cov txheej txheem tshuaj siv nrog PTFE cov khoom siv hluav taws xob uas cov khoom siv siab coefficient ntawm thermal expansion (CTE) renders taag tubesheet daws teeb meem.

Kev Tsim Kho Bayonet (piav qhia)
Lub npe ntawm bayonet style PTFE cua sov exchanger stems los ntawm cov tsos ntawm ib tug bayonet -style lub teeb los yog yeeb nkab txuas, nyob rau hauv uas ib feem yog muab tso rau hauv lwm yam thiab ruaj ntseg ntawm ib tug taw tes. Lub raj bayonet yog tsim los ntawm ob lub concentric tube, lub raj sab hauv thiab lub raj sab nraud, kaw rau ntawm qhov kawg ntawm kev sib hloov cua sov. Kev sib dhos yog muab tso rau hauv lub plhaub (lossis ncaj nraim rau hauv lub tank) thiab tsuas yog ruaj ntseg ntawm qhov nkag / qhov hluav taws xob kawg nkaus xwb- feem ntau ntawm lub raj raj lossis flange. Lwm qhov kawg ntawm tus pas nrig yog pub dawb los nthuav thiab cog lus thermally.

Nrog ib tug bayonet configuration cov kua txoj kev yog feem ntau tsim raws li:

Cov kua dej ua haujlwm (chaw, dej kub lossis dej txias) yog muab los ntawm lub raj sab hauv thiab ntws mus rau qhov kawg kaw.

Cov kua dej yog tig ib ncig ntawm qhov kawg kaw thiab ntws rov qab rau hauv thaj tsam annular nruab nrab ntawm cov raj sab hauv thiab sab nraud.

Cov cua sov yog xa mus rau cov txheej txheem dej ntawm lub plhaub sab (los yog sab tank) los ntawm cov phab ntsa sab nrauv.

Cov kua dej ces tawm ntawm qhov chaw annular, tawm tib qhov kawg nws tuaj rau hauv.

Qhov "hauv-thiab- tawm" ntws channel qhia tias ob qho tib si nkag thiab tawm cov khoom sib txuas yog nyob rau tib qhov kawg ntawm qhov sib pauv. Qhov kawg ntawm lub bayonet raj yog pub dawb tshwj tsis yog ntawm lub foob thiab yog dawb txav axially.

Qhov loj sib txawv nrog cov tsoos tsau tubesheet tsim
Nyob rau hauv ib txwm taag tubesheet PTFE tshav kub exchanger, cov hlab yog tsau ntawm ob hnub, nrog ib tug tubesheet ntawm inlet kawg thiab lwm yam ntawm qhov kawg tawm. Lub raj ntim yog ib feem ntawm lub plhaub thiab lub plhaub - sab nozzles yog welded rau lub plhaub. Kev coj tus cwj pwm thiab qhov yooj yim ntawm kev saib xyuas yog txawv heev.

Thermal strain chaw nyob
Tsis tas li ntawd, kev nthuav dav ntawm PTFE yog 10 txog 20 npaug ntau dua li cov hlau (120 txog 150 × 10−6 /℃piv rau 11 × 10−6 / degree). Nyob rau hauv ib tug ruaj tubesheet tsim, ib tug PTFE raj ntawm 2 m ntev rhuab los ntawm 20℃mus rau 100℃expands txog 12-15 mm. Ob qhov kawg yog tsau, yog li qhov kev nthuav dav no ua rau muaj zog compressive uas tuaj yeem buckle PTFE raj lossis ua rau cov pob qij txha puas. Txhawm rau zam qhov no, ib daim ntawv ruaj khov PTFE exchanger yuav tsum yog:

Floating taub hau (ua kom ib lub tubesheet txav), los yog

Kev sib koom ua ke hauv lub plhaub; lwm txoj,

luv luv raj ntev (txheej txheem lub peev xwm ntawm exchanger)

Txhua qhov kev xaiv no ntxiv cov nuj nqis, qhov nyuaj thiab qhov chaw xau tau.

Ntawm qhov tod tes, bayonet style PTFE tshav kub exchanger yog intrinsically zam rau thermal expansion. Qhov kawg pub dawb ntawm bayonet raj swb axially nyob rau hauv lub plhaub los yog txheej sheath raws li PTFE nthuav thiab cog lus. Xav tau ib qho kev sib koom ua ke, ntab taub hau lossis cov khoom siv tshwj xeeb raug tshem tawm. Daim ntawv bayonet yog tshwj xeeb tshaj yog txaus nyiam rau cov ntawv thov uas muaj qhov kub thiab txias viav vias lossis nquag caij tsheb kauj vab.

Txhim kho kev nkag thiab tshem tawm cov pob khoom
Tus qauv tsim bayonet muaj qhov zoo ntawm cov tshuab ua kom zoo dua uas tag nrho cov raj ntim yuav raug tshem tawm ntawm qhov sib pauv yam tsis cuam tshuam lub plhaub - sab piping. Lub pob yog muab tso rau hauv lub plhaub ntawm ib kawg thiab yog tuav nyob rau hauv qhov chaw los ntawm ib tug flange los yog tubesheet. Txhawm rau tshem tawm cov pob rau kev ntxuav, tshuaj xyuas lossis hloov pauv:

Lub inlet / qhov hluav taws xob yeeb nkab mus rau sab raj yog disconnected.

Tshem tawm cov flange bolts ntawm lub pob.

Lub pob yog muab rho tawm los ntawm lub plhaub nyob rau hauv lub axial kev taw qhia.

Lub plhaub yog nyob rau hauv txoj hauj lwm thiab tag nrho lub plhaub - sab pipework (xws li nozzles, gaskets thiab connectors) yog lawm.

Nyob rau hauv ib tug taag tubesheet tsim, kev tshem tawm ntawm lub raj nras yog ntau nyuaj. Ob qhov kawg ntawm lub plhaub yuav tsum tau qhib, thiab nws yuav tsum tau muab tshem tawm lub plhaub sab nozzles los yog tshem tawm tag nrho cov exchanger ntawm kab. Qhov no yuav yog ib txoj haujlwm loj rau cov neeg sib pauv loj hauv cov txheej txheem tsis khoom.

Rau cov kev pabcuam uas yuav tsum tau ua kom tu tsis tu ncua (piv txwv li, fouling-da dej ua kom zoo nkauj), qhov yooj yim ntawm kev tshem tawm cov pob hauv lub bayonet exchanger yog qhov kev txiav txim siab kom zoo dua. Ib lub pob bayonet tsuas siv sij hawm los tshem tawm, ntxuav thiab muab tso rau hauv; ib lub hnab ntim ruaj khov tuaj yeem txhais tau tias ib hnub puv lossis ntau dua ntawm lub sijhawm poob.

Thermal teeb meem nrog kev ua tau zoo
Tus qauv bayonet muaj kev ua haujlwm thermal ua lag luam-tawm. Txoj kev khiav ntawm lub voj voog (kua dej ntws hauv lub raj sab hauv thiab rov qab los ntawm lub annulus) muab ob npaug - yeeb nkab nyhuv. Muaj ob qhov laj thawj yog vim li cas tag nrho cov tshav kub hloov pauv coefficient qis dua li qhov sib piv counterflow tsau tubesheet tsim:

Txo qhov ntsuas kub zoo sib txawv - Cov qauv ntws tsis yog cov dej ntshiab ntshiab, tab sis sib xyaw ntawm cov dej ntws thiab cov dej sib npaug, uas txo qhov ntsuas qhov ntsuas kub sib txawv (LMTD).

Tsawg tshaj tawm ntawm sab annulus - Rau tib qhov kev khiav hauj lwm tag nrho qhov sib txawv annular yuav muaj qis tshaj tawm tshaj ib lub raj thiab qhov no cuam tshuam rau zaj duab xis coefficient.

Txawm li cas los xij, qhov kev txo qis no feem ntau me me (10-20%) thiab feem ntau cuam tshuam los ntawm qhov muaj peev xwm siv cov raj ntev dua (vim tias thermal expansion tsis yog qhov txwv) thiab ua haujlwm ntawm lub plhaub sab nraud ntau dua. Nyob rau hauv ntau qhov chaw tiav daim ntaub ntawv lub serviceability zoo heev outweigh lub me ntsis efficiency disadvantage.

Khoom siv & Kev tsim kho
Bayonet exchangers yog nrov rau graphite thiab PTFE kev tsim kho raws li lawv nkig los yog creep nyob rau hauv kev ntxhov siab thiab cov ntaub ntawv no muaj ntau thermal expansion. Lub bayonet tsim ua haujlwm nrog cov khoom zoo, tsis tawm tsam lawv.

Hauv PTFE bayonet exchangers, cov raj sab hauv thiab sab nrauv feem ntau yog tsim los ntawm PTFE lossis PFA (perfluoroalkoxy). Qhov kawg kaw yog tsim los ntawm vuam los yog cua sov fusing ob lub raj ua ke. Qhov kawg pub dawb yog qhib thiab lub raj sab hauv dhau los ntawm ib lub raj los yog ferrule. Lub raj sab nraud yog kaw nrog lub raj xaim los ntawm PTFE gasket los yog O- nplhaib uas tso cai rau axial zawv zawg thiab tiv thaiv kom tsis txhob tawg.

Nws yuav tsum tau muab sau tseg tias qhov dawb kawg ntawm lub bayonet raj yuav tsum tau tuav kom tsis txhob muaj kev vibration. Nyob rau hauv ntev bayonet raj (piv txwv li . 3-5 m) nruab nrab kev txhawb nqa rings los yog baffles yog siv nyob rau hauv lub plhaub los coj lub txheej raj yam tsis muaj inhibiting axial txav. Yog tias tsis muaj kev txhawb nqa no, ntws-vim kev co tuaj yeem ua rau muaj kev ntxhov siab thiab ua tsis tiav ntxov.

Cov lus sib piv: Bayonet vs Fixed Tubesheet PTFE Exchanger Feature Bayonet Style PTFE Exchanger Tsau Tubesheet PTFE Exchanger Tube FixingOne kawg tsau, lwm yam kawg pub dawb rau txav Ob qhov kawg txuas rau cov nplooj ntawv raj
Thermal Expansion Accommodation Inherent – ​​dawb kawg slides; tsis muaj expansion sib koom yuav tsum tau floating taub hau, expansion sib koom tes los yog tsis tshua muaj heev cov hlab ntsha
Bundle Removability Ib qho yooj yim rub nras los ntawm ib kawg yam tsis muaj kev cuam tshuam lub plhaub piping Nyuaj xav tau disassembly ntawm ob qho kawg Feem ntau yuav tshem tawm cov exchanger ntawm kab
Nozzles nyob rau hauv ShellCan nyob txuas nrog thaum lub sij hawm bundle tshem tawmExchanger yuav tsum tau detached los yog tsiv
Tube Side ConnectionsInlet thiab qhov hluav taws xob ntawm tib kawg Inlet thiab qhov hluav taws xob ntawm qhov xaus (feem ntau)
Flow Path Nyob rau hauv thiab tawm ntawm concentric hlab (ob - yeeb nkab nyhuv) Ncaj nraim los ntawm (ib qho dhau) los yog ntau - kis nrog rov qab bonnet
Thermal Efficiency Me ntsis txo (LMTD kho qhov ua tau zoo 0.85–0.95) Siab dua (tej zaum yuav tau txais cov txee tiag tiag)
Nruab Nrab Max. Tube LengthHandling thiab vibration txwv thermal stressLimited los ntawm thermal expansion (feem ntau yog 1.5-2.5 m rau PTFE tsis expansion sib koom ua ke)
Fouling Tolerance Zoo, pob khoom yog detachable rau tuFair - tu yuav siv sij hawm ntxiv ntawm kev ua haujlwm
Nqe rau cov chav nyob me me.Moderate - ib leeg tubesheet, tsis muaj kev sib txuas ntxiv qis dua - Kev sib dhos yooj yim rau cov raj luv
Tus nqi ntawm Cov Loj / Ntev Qis - tsis xav tau kev sib koom ua ke ntawm kev nthuav davHigher - ntab taub hau lossis nthuav sib koom ua ke nce nqi
Tswv yim siv rau Bayonet PTFE Thaum tshav kub kub Exchangers
Hauv kev ua tshuaj lom neeg thiab ua kom tiav qhov bayonet tsim yog nyiam rau ntau qhov tshwj xeeb:

Cycling Thermal Cycling - Batch txheej txheem nrog ob peb lub cua sov thiab cua txias ntawm lub exchanger txhua hnub. Qhov pub dawb - zawv zawg bayonet raj tso cai rau kev caij tsheb kauj vab no yam tsis muaj kev ntxhov siab.

Cov kev pab cuam fouling - Cov chav da dej uas tawm hauv nplai, sludge, los yog cov organic coatings rau ntawm qhov chaw tshav kub. Nws yog ib qho tseem ceeb uas yuav tsum muaj peev xwm rub tau cov pob khoom rau kev kho tshuab lossis tshuaj ntxuav raws li kev teem caij tsis tu ncua.

Aggressive acid ib puag ncig xav tau PTFE - PTFE yog tshuaj inert thiab teev rau aggressive acids (xws li hydrochloric, sulfuric, hydrofluoric). bayonet tsim txo tus naj npawb ntawm cov ntsaws ruaj ruaj thiab muaj peev xwm xau qhov chaw ntawm lub raj sab.

Qhov chaw txwv tsis pub nkag - Thaum lub exchanger yuav tsum tau ua nyob rau hauv ib lub qhov, tiv thaiv phab ntsa, los yog nyob rau hauv ib qho chaw uas nkag mus rau ob qho tib si kawg tsis tuaj yeem ua tiav. Ib tug bayonet exchanger yog muab kev pab ntawm ib kawg nkaus xwb.

Retrofit installations - Kev hloov pauv ntawm ib qho kev hloov pauv uas twb muaj lawm nrog cov teeb meem thermal qaug zog Lub hauv paus ua rau cov kev ua tsis tiav raug tshem tawm los ntawm tus qauv bayonet.

Nyob rau hauv sib piv, ruaj tubesheet systems tseem sib tw rau:

Me me, luv luv exchangers ( raj ntev <1.5 m) thaum tshav kub expansion tsis yog ib qho teeb meem.

Daim ntawv thov tsis muaj thermal cycling. Cov kua dej ntshiab heev.

Thaum ntshiab counterflow yog tsim nyog los ua kom lub LMTD (xws li cov cua sov rov qab nrog rau qhov kub thiab txias mus kom ze).

Cov phiaj xwm nrog kev txwv nyiaj txiag qhov twg tus nqi qis tshaj plaws yog tus tsav tsheb loj.

Installation thiab kev ua haujlwm xav tau
Muaj ntau qhov ua tau zoo uas yuav tsum tau coj mus rau hauv tus account hauv kev qhia txog bayonet style PTFE tshav kub exchanger.

Kev them nyiaj yug ntawm qhov kawg dawb Qhov kawg pub dawb ntawm lub bayonet raj yuav tsum tau txais kev txhawb nqa, tab sis tsis nruj nruj. Hlau-rau-PTFE tiv tauj yog tiv thaiv los ntawm PTFE hnav lub tes tsho lossis qis- cov nplhaib sib txhuam.

Foob tsim - Cov zawv zawg foob rau kev nkag ntawm lub raj sab nraud rau hauv lub raj xaim yuav tso cai rau axial txav yam tsis muaj qhov to. Feem ntau yog PTFE di ncauj ntsaws ruaj ruaj los yog O-rings nrog lub caij nplooj ntoos hlav energisers.

Flow distribution - Xyuas kom meej tias qhov sib txawv annular yog qhov loj txaus kom tsis txhob muaj qhov txo qis ntau dhau. Qhov sib txawv feem ntau yog 2-5 hli, nyob ntawm txoj kab uas hla ntawm lub raj thiab ntws tawm.

Tube kev co - Baffles lossis cov phaj txhawb nqa yuav tsum nyob ntawm 0.5–1.0 meter ib ntus kom tsis txhob muaj vortex-vim kev co. Cov kev txhawb nqa yuav tso cai rau axial zawv zawg.

Nco ntsoov tias bayonet exchangers tuaj yeem ntsia tau rau hauv ntau tus lej hauv ib lub plhaub. Lub multi- bayonet tsim siv ntau lub bayonet raj nyob rau hauv tandem, tag nrho fastened nyob rau tib lub tubesheet. Qhov kev npaj no muab thaj chaw loj rau kev hloov pauv cua sov thiab nkag mus rau kev saib xyuas los ntawm ib qho kawg nkaus xwb.

Xaus