Yuav Ua Li Cas Xaiv Qhov Zoo Tube Diameter rau PTFE Exchanger Tuav Fibrous Slurry?

Daim ntawv zeb los yog kev lag luam textile xa tawm cov kwj deg uas ntim nrog ntev, tawv, stringy fibers. Khiav qhov no los ntawm cov pa hluav taws xob PTFE nrog cov hlab nqaim 6 hli thiab koj muaj daim ntawv qhia rau lub ntsaws ceev, tag nrho thiab cuam tshuam. Cov strands yuav ncav cuag qhov nkag mus rau hauv lub raj, tsim kom muaj tangled lev thiab lub tshav kub hloov mus yuav tsoo. Thawj, thiab qhov tseem ceeb tshaj plaws, cov kauj ruam hauv kev tsim cov khoom sib pauv yog xaiv lub raj loj txaus kom lub wad ntawm qhov phem tshaj - cov ntaub ntawv fibers tuaj yeem taug kev ncaj nraim los ntawm qhov tsis muaj snagging. Xaiv txoj kab txoj kab uas hla PTFE exchanger rau fibrous slurries yog thawj thiab tseem ceeb tshaj plaws kauj ruam mus rau ib tug dependable, tswj kom txias los yog cua sov system.

Lub Logic ntawm Kev Tsim: Txuag Thermal Efficiency rau Flow Assurance
Vim li cas cov kab me me feem ntau pom zoo
Lub ntsiab thermal kom zoo dua ntawm PTFE raj yog nws qhov chaw loj heev rau qhov ntim piv, uas yog qhov zoo tshaj plaws nrog lub taub me me. Cov hlab me me (4-6 hli puab txoj kab uas hla, piv txwv li) ntim ntau qhov chaw hloov mus rau hauv lub plhaub ntim, raug nqi cov khoom siv tsawg thiab ua rau muaj kev kub ntxhov ntawm qis dua. Nws yog qhov zoo tshaj plaws tsim rau cov kua dej huv. Tab sis rau ib tug fibrous slurry no tshav kub logic tsis siv yog hais tias cov hlab tau plugged. Ib lub raj thaiv tsis muaj cua sov.

Txoj Cai Golden: Tube Diameter Loj dua Fiber Length
The engineer must select a tube with an inner diameter that is much greater than the longest fibres in the slurry. A good safe place to start is a 10mm or 12mm inner diameter (ID) tube. For very long fibres (e.g., >10 hli) txoj kab uas hla ntawm 15 mus rau 20 hli yuav tsim nyog. Qhov no yuav pom tseeb ua rau muaj qhov sib pauv loj dua rau tib lub luag haujlwm thaum tshav kub kub thiab lub plhaub sab qis qis uas yuav xav tau ntxiv baffles lossis ntau dua tag nrho cov dej ntws. Kev lag luam tawm yog pom tseeb, me ntsis loj dua, tsis tshua muaj thermally npaum exchanger uas ua tau hauj lwm vs ib qho me me, thermally npaum ib qho uas ib txwm ntsaws.

Txhawm rau kom cov cua sov ntws mus, cov fiber ntau clumps yuav tsum tuaj yeem taug kev raws txoj kev loj qhib; ib tug nqaim, twisting channel yuav cia li ua ib tug clogged, unusable conduit. Tseem yuav tsum muaj lub tshuab lim dej los yog tshuaj ntsuam cov dej ntws tawm kom tshem tawm cov khib nyiab loj, tab sis lub raj yuav tsum muaj peev xwm hla txhua cov fibers uas tuaj txog.

Technical Aspects rau kev ua haujlwm ntseeg tau
Ceev ntawm Tube Sab
Lub raj sab tshaj tawm kuj yuav tsum tau khaws cia siab - ib txwm siab tshaj 2 m / s - txhawm rau tiv thaiv cov fibers los yog lo rau lub raj phab ntsa. Ntawm qhov qis qis, cov khoom sib txuam ntawm cov ntaub ntawv fibrous nyob rau hauv qab ntawm kab rov tav yog tshwm sim los ntawm lub ntiajteb txawj nqus, yog li maj mam tsim lub txaj uas cuam tshuam qhov ntws. Kev nrawm dua (txog 3-4 m / s, txwv los ntawm kev poob siab) khaws cov fibers hauv kev ncua thiab pab tshem tawm txhua qhov kev hloov pauv hloov pauv- nce los ntawm kev sib pauv. Qhov kev xav tau nrawm no tseem cuam tshuam rau kev xaiv ntawm txoj kab uas hla ntawm lub raj, vim tias cov raj loj dua yuav tsum muaj qhov ntws ntau dua los tsim cov kev sib tw, thiab qhov no tuaj yeem ua rau muaj zog ntxiv rau kev siv.

Tube Arrangement thiab Plhaub -Side Aspects
Nyob rau hauv cov ntaub ntawv ntawm fibrous slurries ntawm lub raj sab, clogging yog tsawg tsim nyog rau lub plhaub sab tsim, tab sis kev nkag mus rau kev ntxuav yog tseem ceeb heev. Lub square raj layout yog xaiv nyob rau hauv daim duab peb sab pitch vim hais tias nws muab ncaj unobstructed passageways ntawm raj kab thiab tso cai rau mechanical tu ntawm lub plhaub sab nyob rau hauv cov ntaub ntawv ntawm fouling. Tab sis txoj kab uas hla lub raj tseem yog qhov tseem ceeb tiv thaiv kev ntsaws. Txawm hais tias qhov zoo nkauj zoo nkauj npaum li cas, yog tias lub bore ntawm lub raj me me dhau lawm, tsis muaj lub plhaub sab baffling lossis ntxuav nkag yuav tiv thaiv cov raj thaiv.

Lwm yam kev tsim qauv
Tube nkag geometry: Ib lub vojvoog du lossis flare ntawm kev noj haus tiv thaiv cov fibers los ntawm snagging ntawm cov npoo ntse. Tube yuav tsum yaug nrog lub ntsej muag tubesheet uas tsis muaj daim di ncauj protruding.

Tube length: A shorter tube (e.g. 1-2 m) is easier to rod out if a blockage occurs. For very long tubes (>3 m) kev tu neeg kho tshuab tsis siv tau.

Reversibility Lub exchanger yuav tsum tsim kom muaj kev ntws rov qab (piv txwv li tuaj yeem ntws mus rau ob qho kev taw qhia) kom cov blockages ib ntus tuaj yeem raug tshem tawm los ntawm rov qab -flushing.

Cov Lus Qhia rau Kev Xaiv
Qhov siab tshaj plaws fiber ntau qhov tsawg kawg nkaus pom zoo raj IDTypical siv <3 mm 6-8 mm Fine paper pulp, textile finishes
10 hli 3-6 hli Cov khib nyiab pov tseg, dej dawb ib txwm los ntawm daim ntawv- ua kev lag luam
12-15 mm 6-10 mm Coarse pulp, shredded pov tseg, qee zaus cov khoom noj slurries> 10 mm 15-20 mm los yog bespoke Rag ntsiab lus, ntev hluavtaws fibers
Cov lej yog rau dilute slurry (< 5% fibres by weight). Larger diameters and lower velocities are necessary at greater concentrations to avoid bridging.

Kev lag luam uas tsis tuaj yeem hloov pauv -tawm: Loj vs. clogging
Lub raj txoj kab uas hla ncaj qha cuam tshuam qhov loj thiab tus nqi ntawm cov khoom sib hloov. Lub cheeb tsam ntawm ib chav tsev ntev yog proportional rau txoj kab uas hla, yog li kom tau txais tib qhov chaw ntawm lub tshav kub lub luag hauj lwm, ib tug 10 hli ID raj xav tau txog 44% ntau cov hlab (los yog ntev tubes) tshaj 12 hli ID raj. Qhov no yuav tsum tau nce hauv lub plhaub taub thiab yog li ntawm cov khoom siv thiab cov nqi tsim khoom. Txawm li cas los xij, cov nuj nqis ntawm lub sijhawm tsis tu ncua los ntxuav lub qhov sib txuas sib txuas yog ze li ib txwm muaj ntau dua li cov peev nyiaj ua ntej rau lub hom loj dua, tsis muaj teeb meem. Qhov loj ntawm lub qhov feem ntau yog qhov tsim qauv tseem ceeb tshaj plaws hauv cov khoom sib tw - rau - kev sib ntaus sib tua.

Xaus: Yeej Tsov Rog tiv thaiv Plugg
The simple bold decision of a large-bore tube wins the war against plugging in a PTFE exchanger handling a fibrous slurry. Tube inlet bridging avoided with inner diameter of 10 mm or more, sufficient tube-side velocity (>2 m / s) thiab straining sab saud. Qhov kev xaiv no yog ib qho kev cia siab, tswj tau thiab lub neej ntev kev hloov hluav taws xob hloov pauv, tab sis tsis tso tseg qee qhov kev hloov pauv hluav taws xob thiab ua kom qhov loj ntawm cov khoom sib hloov. Nyob rau hauv cov ntaub ntawv ntawm cov khib nyiab, qhov luaj li cas feem ntau yog qhov tseem ceeb tshaj plaws tsim qauv.