Cov tswv yim dab tsi tiv thaiv Flow Maldistribution nyob rau hauv PTFE Exchanger Ua Haujlwm ntawm Cov Plhaub Tsawg -Side Flows?

Hauv PTFE exchanger, lub plhaub qis - sab ntws tuaj yeem yooj yim los ntawm kev hla loj loj nyob ib ncig ntawm lub raj ntim, coj txoj hauv kev ntawm qhov tsis kam tiv thaiv tsawg thiab ua rau me ntsis kev sib cuag nrog lub tshav kub hloov chaw. Zam kev hla qhov no yog qhov tseem ceeb kom ua tiav qhov siab tshaj plaws thermal kev ua tau zoo los ntawm cov xwm txheej tsis txaus.

Plhaub Sab Flow Maldistribution Xwm ntawm
Nyob rau hauv ib tug tsawg txaus PTFE exchanger nrog plhaub sab ntws maldistribution, lub plhaub sab kua muaj ob peb sib tw khiav raws. Cov kua dej yog, qhov zoo tshaj plaws, tau tsav hla lub raj ntim qhov chaw uas cov cua sov hloov mus rau qhov chaw. Nyob rau hauv qhov tseeb, muaj lwm yam uas tsis muaj kev tiv thaiv kab mob:

Flow bypass ntawm lub plhaub phab ntsa thiab cov pob

Baffle-rau-Shell Clearance Leakage

Short circuiting los ntawm raj - mus rau -baffle gaps

Momentum pab kom kis tau cov kua ntau sib npaug ntawm cov dej ntws ntau dua. Txawm li cas los xij, nyob rau theem qis qis, kev tsav tsheb siab yog qhov me me thiab cov dej ntws tau tsom mus rau txoj kev yooj yim tshaj plaws. Yog li ntawd, ib feem ntawm cov kua dej tuaj yeem hla lub raj ntim tag nrho, ua rau kev siv thermal tsis zoo thiab txo qis kev ua haujlwm ntawm cov khoom sib pauv.

Low Flow Maldistribution: Critical Mechanisms
Qhov teeb meem tseem ceeb ntawm lub plhaub qis- sab nrawm yog qhov tsis muaj qhov sib txawv ntawm qhov sib txawv kom kov yeej cov dej tsis haum. Cov kua dej zoo dua dhau los ntawm:

Plhaub rau baffle nrug

Peripheral tube bundle gap

Cov cheeb tsam uas tsis tshua muaj dej tsis kam nyob ze rau thaj chaw tau txais

Thaum lub bypass ntws dominates, qhov zoo ntawm tshav kub hloov chaw yog heev txo txawm tias qhov tseeb nto ntawm tshav kub exchanger tseem zoo sib xws.

Tsim Cov Tswv Yim rau Plhaub -Side Flow
Baffle thiab Plhaub Clearance, Kho
Txoj kev yooj yim tshaj plaws los tswj maldistribution yog kom txo cov kev xau los ntawm kev nruj cov neeg kho tshuab kam rau ua. Cov qauv zoo li TEMA tsim kom muaj kev lees paub ntawm:

Sab nraud txoj kab uas hla, baffle, plhaub, phab ntsa sab hauv

Sab nraud txwv ntawm lub raj ntim thiab lub plhaub phab ntsa

Tube qhov thiab baffle phaj

Txo cov kev tshem tawm no txo ​​qis bypass ntws thiab tsav cov kua dej ntau dua los ntawm lub raj ntim. Txawm li cas los xij, cov khoom siv sib txuas yuav tsum tau zam los ntawm kev xav txog kev tsim khoom thiab kev nthuav dav thermal.

Kev siv Sealing Sawb
Sealing strips muab tso rau ntawm qhov periphery ntawm lub raj ntim khoom feem ntau yog ua haujlwm los thaiv kev hla hla ntawm cov pob khoom thiab lub plhaub. Cov strips no ua raws li lub cev teeb meem rau deflect lub plhaub sab ntws mus rau hauv lub raj pob hauv cheeb tsam.

Tus tsim ntawm sealing strips nyob rau hauv PTFE exchangers yuav tsum coj mus rau hauv tus account qhov yooj ntawm cov khoom thiab thermal expansion zog ntawm cov khoom, kom ntseeg tau tias sealing zog yog tswj nyob rau hauv lub khiav hauj lwm kub.

Optimization ntawm Baffle Geometry
Lub baffle tsim yog qhov tseem ceeb rau kev khiav dej num. Kev txiav me me ntawm qhov baffle nce qhov feem ntawm ntws nias hla lub raj ntim thiab tsis tso cai rau bypass axially. Tab sis yog tias baffle txiav raug txo ntau dhau lawm, kev poob siab yuav nce ntau.

Full baffles can be employed (little or no cut, with controlled clearance gaps) to impose a primarily cross-flow arrangement for applications with very low flow rates.

Helical Baffle Kev Npaj
Cov kev daws teeb meem ntau dua yog helical lossis kauv baffle systems. Cov yam ntxwv no ua rau lub plhaub -sab dej nyob rau hauv ib tug nruam helical qauv, txhim khu plug- ntws- zoo li tus cwj pwm thiab txo qhov chaw nyob ruaj khov.

Helical baffles yog costlier thiab ntau technically complex, tab sis lawv zoo heev txo qhov raug rau to thiab maldistribution. Qhov no ua rau lawv muaj txiaj ntsig tshwj xeeb hauv qis - ntws PTFE cov tshuab uas cov pa segmental baffles muaj teeb meem ua tiav qhov kev faib tawm.

Tsim Cov Cai rau Cov Plhaub Qis-Side Flow Operation
Qee cov tswv yim tsim qauv yooj yim tuaj yeem raug sau tseg kom txo qis qis PTFE exchanger plhaub sab ntws maldistribution teeb meem:

Txo cov baffle rau lub plhaub thiab pob rau lub plhaub tshem tawm kom tau txais kev txwv

Seal peripheral bypass hlab nrog sealing strips

Nce tus ntoo khaub lig-Flow feem hla lub raj pob los ntawm kev txo cov baffle txiav

Kev siv cov helical baffles los ua kom muaj kev sib haum xeeb ntawm cov nqi qis heev

Xyuas kom cov inlet faib yog sib xws li ua tau kom tsis txhob muaj kev sib tw hauv zos