Cov kwj deg los ntawm cov ntawv zeb los yog cov nroj tsuag textile yog ntim nrog ntev, tawv, stringy fibers. Dhau qhov no los ntawm tus qauv PTFE cua sov exchanger nrog nqaim, 6 hli hlab yog ib daim ntawv qhia rau ib tug ceev, tiav, thiab chim siab plug. Cov fibers yuav txuas hla lub raj nkag, tsim ib lub tangled lev, thiab lub tshav kub hloov mus yuav tsoo. Kev tsim ntawm cov khoom sib pauv yuav tsum pib nrog qhov yooj yim, tab sis qhov tseem ceeb, kev txiav txim siab: lub raj yuav tsum loj txaus uas lub wad ntawm cov fibers phem tshaj plaws tuaj yeem hla ncaj qha yam tsis tau ntes. Xaiv qhov raugTube txoj kab uas hla fibrous slurry PTFE exchangeryog thawj kauj ruam tseem ceeb tshaj plaws rau kev txhim khu kev qha, khaws cia txias lossis cua sov.

Tus Tsim Logic: Kev Lag Luam Thermal Efficiency rau Flow Assurance

Yog vim li cas cov kab me me thiaj li nyiam

Qhov zoo tshaj plaws thermal kom zoo dua ntawm PTFE raj yog nws qhov loj ntawm thaj tsam-rau-ntim piv, uas yog qhov zoo tshaj plaws ua tiav nrog txoj kab uas hla me me. Cov hlab me me (piv txwv li, 4-6 hli puab txoj kab uas hla) ntim ntau qhov chaw hloov hluav taws xob mus rau hauv lub plhaub ntim, txo cov nqi khoom, thiab txhawb cov dej ntws tawm ntawm qis dua. Rau cov kua dej huv, qhov no yog qhov zoo tshaj plaws tsim. Txawm li cas los xij, rau ib qho fibrous slurry, qhov kev sib cav thermal no yuav tsis cuam tshuam yog tias cov raj raug thaiv. Lub raj txuas txuas tsis muaj cua sov.

Txoj Cai Tseem Ceeb: Tube txoj kab uas hla yuav tsum tshaj Fiber Length

The engineer must choose a tube with a minimum inner diameter that is significantly larger than the maximum length of the fibres present in the slurry. A common safe starting point is a 10 mm or 12 mm inner diameter (ID) tube. For extremely long fibres (e.g., >10 mm), txoj kab uas hla ntawm 15-20 mm yuav tsum tau. Qhov no inevitably txhais tau hais tias rau tib lub tshav kub lub luag hauj lwm, lub exchanger yuav loj dua thiab muaj ib tug qis plhaub-sab tshaj tawm, uas tej zaum yuav xav tau ntau baffles los yog ntau dua tag nrho cov txaus txaus. Kev lag luam tawm yog ib qho kev xaiv meej: me ntsis loj dua, tsis tshua muaj thermally npaum exchanger uas ua tau hauj lwm, piv rau ib tug compact, thermally npaum ib tug perpetually ntsaws.

Ib txoj kev dav dav, qhib kev loj rau cov fiber ntau clumps yog tib txoj hauv kev kom cov cua sov ntws; txoj kev nqaim, twisting yuav yooj yim los ua ib tug clogged, useless yeeb nkab. Ib lub tshuab lim dej lossis cov tshuaj ntsuam dej ntws tseem yog qhov tseem ceeb kom tshem tawm cov khib nyiab loj tshaj plaws, tab sis lub raj nws tus kheej yuav tsum muaj peev xwm hla txhua cov fibers uas tau dhau los.

Kev txiav txim siab txog kev ua haujlwm ntseeg tau

Txhim kho Tube-Side Velocity

Lub raj-sab tshaj tawm yuav tsum tau tswj kom siab txaus -feem ntau tshaj 2 m / s- kom cov fibers tsis nyob los yog adhering rau lub raj phab ntsa. Nyob rau hauv qis dua, lub ntiajteb txawj nqus ua rau fibrous solids tso rau hauv qab ntawm kab rov tav raj, maj mam tsim lub txaj uas txwv tsis pub ntws. Kev tshaj tawm siab dua (txog 3-4 m / s, raug txwv los ntawm kev poob siab) khaws cov fibers nyob rau hauv ncua kev kawm ntawv thiab pab tshem tawm cov commulations ib ntus los ntawm lub exchanger. Qhov kev xav tau nrawm no txuas ntxiv cuam tshuam rau kev xaiv ntawm txoj kab uas hla: cov raj loj yuav tsum muaj qhov ntim ntau dua kom ua tiav tib qhov kev tshaj tawm, uas tuaj yeem ua rau muaj zog ntxiv.

Tube Layout thiab Plhaub-Side Considerations

Rau cov fibers slurries ntawm lub raj sab, lub plhaub-sab tsim tsis tshua muaj qhov tseem ceeb rau kev ntsaws, tab sis kev nkag mus rau kev ntxuav tseem tseem ceeb. Ib qho square tube layout yog nyiam dua ib qho duab peb sab vim nws muab txoj kab ncaj nraim, tsis muaj kev cuam tshuam ntawm cov kab kab, tso cai rau kev tu txhua yam ntawm lub plhaub sab yog fouling tshwm sim. Txawm li cas los xij, txoj kab uas hla ntawm lub raj tseem yog qhov tseem ceeb tiv thaiv kev ntsaws. Txawm tias muaj qhov zoo tshaj plaws layout, yog hais tias lub raj bore yog me me, tsis muaj ib tug npaum li cas ntawm lub plhaub-sab baffling los yog ntxuav kev nkag tau mus tiv thaiv lub raj blockage.

Ntxiv cov qauv tsim

Tube nkag geometry: Ib qho yooj yim radiused los yog flared inlet txo qhov kev pheej hmoo ntawm fibers ntes ntawm ntse npoo. Cov hlab ntsha yuav tsum tau tso dej ntws tawm nrog lub ntsej muag tubesheet, tsis muaj daim di ncauj.

Tube ntev: Cov hlab me me (piv txwv li, 1-2 m) yooj yim dua rau rods tawm yog tias muaj qhov thaiv. Cov raj ntev heev (tshaj 3 m) ua rau kev tu tshuab tsis zoo.

Rov qab los: Lub exchanger yuav tsum tau tsim los rau ntws reversal (piv txwv li, muaj peev xwm ua hauj lwm nyob rau hauv ob qho tib si kev taw qhia) thiaj li hais tias ib ntus blockages yuav dislodged los ntawm back-flushing.

Cov txheej txheem xaiv tswv yim

Cov txiaj ntsig no suav tias yog dilute slurry (<5% fibres by weight). For higher concentrations, larger diameters and lower velocities are required to avoid bridging.

Lub Unavoidable Trade-Off: Loj vs. Clogging

Xaiv lub raj loj dua txoj kab uas hla ncaj qha cuam tshuam qhov sib pauv loj thiab tus nqi. Rau tib lub luag haujlwm thaum tshav kub kub, 12 hli ID tube yuav tsum muaj kwv yees li 44% ntau cov raj (los yog cov raj ntev) dua li 10 hli ID raj kom ua tiav tib qhov chaw, vim tias thaj tsam ntawm ib chav tsev ntev yog proportional rau txoj kab uas hla. Lub plhaub txoj kab uas hla yuav tsum tau nce raws li, nce cov khoom thiab cov nqi fabrication. Txawm li cas los xij, tus nqi pheej yig dua rau kev ntxuav lub ntsaws ntsaws ntsaws yog yuav luag ib txwm siab dua li tus nqi them nyiaj ua ntej rau qhov loj dua, tsis siv neeg tsim. Hauv kev sib ntaus sib tua tiv thaiv cov khib nyiab, qhov tseem ceeb tshaj plaws ntawm cov qauv tsim yog feem ntau qhov loj ntawm lub qhov.

Xaus: Yeej Tsov Rog Tawm Tsam Plug

Kev tuav cov fibers slurry nyob rau hauv ib tug PTFE exchanger yog ib tug tsov rog tiv thaiv plugging, yeej los ntawm qhov yooj yim, bold xaiv ntawm ib tug loj-bore raj. Qhov tsawg kawg nkaus sab hauv txoj kab uas hla ntawm 10 mm los yog ntau dua, ua ke nrog txaus lub raj-sab tshaj tawm (tshaj li 2 m / s) thiab cov dej ntws tawm, xyuas kom cov fibers ntws los ntawm ntau dua li tus choj hla lub raj inlets. Txawm hais tias qhov kev xaiv no ua rau qee qhov kev hloov pauv hluav taws xob ntau dua thiab nce qhov sib hloov pauv loj, nws muab cov kev daws teeb meem ruaj khov, ruaj khov, thiab ua neej nyob ntev. Hauv kev sib ntaus sib tua tiv thaiv cov khib nyiab, qhov tseem ceeb tshaj plaws ntawm cov qauv tsim yog feem ntau qhov loj ntawm lub qhov.