Thaum tshav kub kub ntws los ntawm graphite tshaj 300 lub sij hawm yooj yim dua los ntawm PTFE. Cov khoom siv ib leeg no muaj qhov cuam tshuam loj rau qhov loj, qhov hnyav, thiab tus nqi ntawm cov khoom siv hluav taws xob. Qhov twg PTFE yuav tsum muaj thaj chaw dav dav los them rau nws cov rwb thaiv tsev-zoo li tus cwj pwm, graphite zoo hloov cov cua sov hla lub hauv paus loj. Qhov tshwm sim yog qhov txo qis hauv cov cuab yeej hneev taw thiab cov kev xav tau ntawm cov qauv, ncaj qha cuam tshuam rau tag nrho cov nqi nruab thiab cog layout yooj.
Qhov sib txawv ntawm cov conductivity: Graphite vs. PTFE
Graphite cov thermal conductivity feem ntau yog li ntawm 80 txog 120 W / m·K, tus nqi piv rau qee cov hlau xws li carbon steel lossis qis- alloy steels. PTFE, los ntawm qhov sib txawv, muaj cov thermal conductivity ntawm kwv yees li 0.25 W / m·K- kwv yees sib npaug rau cov ntaub ntawv yas insulating. Qhov no txhais tau hais tias los ntawm qhov muab cov thickness thiab kub gradient, graphite phab ntsa ua kom sov dua 300 npaug ntau dua li PTFE.
Qhov qis conductivity ntawm PTFE feem ntau yog qhov tseem ceeb thermal kuj nyob rau hauv PTFE tshav kub exchanger. Thaum tshav kub kub yuav tsum hla lub raj phab ntsa, uas, txawm tias nyias (feem ntau 1-2 hli), tseem muaj qhov cuam tshuam tseem ceeb. Yuav kom ua tiav qhov xav tau tag nrho cov cua sov hloov mus, yuav tsum tau muab thaj chaw loj. Qhov chaw saum npoo ntawd tau pom los ntawm ntau qhov ntev, me me - txoj kab uas hla, ua rau cov raj loj loj thiab cov plhaub loj.
Hauv graphite exchanger, txawm li cas los xij, cov khoom nws tus kheej tsis txwv cov cua sov. Cov kev tawm tsam tseem ceeb dhau los ua cov dej ciam txheej ntawm ob sab. Yog li ntawd, rau tib cov kua dej nrawm thiab fouling tej yam kev mob, ib tug graphite exchanger yuav ua tau ib tug ntau dua tag nrho cov tshav kub hloov coefficient (U-tus nqi) dua ib chav PTFE.
Quantifying qhov txo qhov luaj li cas
Qhov ua tau zoo tag nrho cov kev hloov pauv cua sov coefficient (U-tus nqi) qhia txog qhov sib xyaw ua ke ntawm cov khoom siv hluav taws xob, phab ntsa tuab, thiab cov yeeb yaj kiab ua kua. Rau ib lub luag haujlwm ua kua-kua nrog nruab nrab fouling:
Graphite block los yog plhaub-thiab-tube exchanger: U-tus nqi feem ntau yog li ntawm 600 txog 1200 W / m²·K.
PTFE tube exchanger: U-tus nqi feem ntau poob ntawm 200 thiab 400 W / m²·K.
Ua ib qho kev sib piv nruab nrab, lub graphite exchanger yuav muaj U-tus nqi peb zaug siab dua ib chav PTFE rau tib qhov kev pabcuam. Txij li qhov yuav tsum tau ua kom sov qhov chaw hloov pauv hloov pauv hloov pauv mus rau U, tus qauv graphite xav tau tsuas yog ib feem peb ntawm thaj chaw. Txawm li cas los xij, cov nyhuv conductivity yog qhov tseem ceeb tshaj plaws ntawm cov txheej txheem siab dua - sab zaj duab xis coefficients (xws li, condensing vapors lossis high-velocity kua), qhov twg lub raj-phab ntsa tsis kam ntawm PTFE ua qhov tseem ceeb. Nyob rau hauv cov ntaub ntawv no, graphite qhov zoo ntawm cheeb tsam tuaj yeem ncav cuag ib qho ntawm tsib mus rau kaum.
Qhov tshwm sim ntawm qhov sib txawv conductivity no yog qhov txaus ntshai. Ib qho piv txwv zoo piav qhia txog qhov ntsuas: txias 100 kW ntawm kub hydrochloric acid los ntawm 80℃mus rau 40℃siv cov dej txias yuav xav tau lub plhaub PTFE-thiab-tube exchanger kwv yees li ntawm lub tsheb me me (piv txwv li, 2-3 meters ntev, 0.6 meter txoj kab uas hla, nrog ntau pua lub raj). Tib lub luag haujlwm tswj hwm los ntawm graphite block exchanger tuaj yeem ua tiav nrog ib chav tsev loj ntawm lub thawv ntim loj (xws li 0.5 × 0.5 × 0.6 meters). Qhov ntim sib txawv tuaj yeem siab li 5: 1 lossis ntau dua.
Qhov hnyav thiab qhov cuam tshuam ntawm cov qauv
Lub cev me me ncaj qha txhais ua qhov hnyav dua. Agraphite thermal conductivity compact tshav kub exchangerFeem ntau hnyav 50-70% tsawg dua li PTFE exchanger ntawm sib npaug thermal dej. Cov khoom siv plhaub (feem ntau carbon steel lossis stainless hlau) kuj raug txo vim hais tias cov graphite core sab hauv muaj qhov chaw tsawg dua. Cov khoom siv sib zog xav tau kev txhawb nqa cov qauv tsis muaj zog, txo cov nqi xa khoom, thiab ua kom yooj yim rau kev teeb tsa-tshwj xeeb tshaj yog nyob rau hauv qhov chaw siab lossis qhov chaw tsis txaus.
Nyob rau hauv retrofit tej yaam num, qhov uas twb muaj lawm lub hauv paus los yog kev nkag mus txwv muaj nyob rau hauv pem teb, lub compactness ntawm graphite exchangers feem ntau txiav txim seb puas muaj corrosion-resistant tshuaj yuav tsum tau ntsia rau tag nrho cov. PTFE exchangers, los ntawm kev xav tau cov hneev taw loj thiab qhov tseem ceeb clearances rau kev tshem tawm cov raj ntim, tej zaum yuav tsis haum rau hauv qhov chaw nrog cov kav dej thiab cov khoom siv uas twb muaj lawm.
Daim ntawv thov piv txwv qhov Compactness yog qhov tseem ceeb
Pharmaceutical thiab zoo tshuaj nroj tsuagua haujlwm nyob rau hauv chav tsev uas raug nqi siab los yog qhov chaw muaj kev pov hwm. Txhua square meter ntawm qhov chaw hauv pem teb incurs tseem ceeb kev tsim kho thiab kev siv nyiaj txiag. Graphite exchangers tso cai rau cov txheej txheem engineers txhim kho cov cua txias lossis cua sov hauv cov txheej txheem nruj, tawm hauv chav rau lwm yam khoom siv. Cov hneev taw me me kuj tseem tuaj yeem txo qhov ntsuas qhov xav tau ntawm cov cua sov, qhov cua, thiab cov cua txias (HVAC) hauv cov chaw huv.
Pickling thiab nto finishing kabfeem ntau muaj kev txwv tsis pub nkag mus nyob ib ncig ntawm lub tank thiab conveyor systems. Graphite block exchangers tuaj yeem ntsia ncaj qha rau ntawm phab ntsa tank lossis hauv qab cov platforms, thaum lub pob PTFE yuav xav tau ib lub plhaub cais ib leeg thiab tseem ceeb ntawm cov raj rub tawm.
Semiconductor thiab ultra-ntshiab chemical manufacturingxav tau qhov ntim tsawg kawg nkaus thiab kub ceev teb. Graphite lub compact tsim txo qhov ntim ntim, txhim kho cov txheej txheem tswj thiab txo cov khoom poob thaum hloov qib.
Thaum Compactness yuav tsum sib npaug ntawm lwm yam
Lub compactness ntawm graphite exchangers tsis yog tsis muaj trade-offs. Raws li tau tham nyob rau hauv lwm cov khoom, graphite yog nkig thiab tsis tuaj yeem tiv taus kev poob siab lossis kev co. PTFE, txawm tias nws loj dua, muaj zog tiv thaiv dej rauj thiab misalignment. Rau cov ntawv thov uas qhov chaw muaj ntau thiab kev ntseeg siab ntawm cov neeg kho tshuab yog qhov kev txhawj xeeb tseem ceeb, PTFE tseem yuav raug xaiv txawm tias nws cov hneev taw loj dua.
Txawm li cas los xij, nyob rau hauv ib qho chaw tshiab lossis kev nthuav dav uas vaj tse kim lossis cov txheej txheem skids nruj nreem, qhov siab.graphite thermal conductivity compact tshav kub exchangerkev tsim qauv feem ntau yog qhov kev daws teeb meem zoo tshaj plaws. Cov chav tsev me me kuj txo qhov ntim ntawm cov khoom siv kim kim, cov nozzle fittings, thiab rwb thaiv tsev.
Xaus
Graphite lub ntsiab muag yog nws lub peev xwm los xa cov cua kub hloov pauv hauv chav tsev compact- muaj peev xwm tsis sib xws los ntawm PTFE. Thermal conductivity 300 lub sij hawm ntau dua PTFE txhais rau tag nrho cov tshav kub hloov coefficients peb mus rau kaum lub sij hawm siab dua, tso cai rau ib tug muab lub luag hauj lwm yuav tsum tau ua nyob rau hauv ib tug ho me me thiab sib zog exchanger. Rau cov ntawv thov xws li tshuaj, tshuaj zoo, thiab kev ua tiav qhov chaw hauv pem teb, kev thauj khoom thiab kev teeb tsa yog qhov tseem ceeb, graphite muab qhov txiaj ntsig zoo. Kev xaiv cov khoom siv yuav tsum xav txog tsis yog tshuaj lom neeg sib raug zoo nkaus xwb tab sis kuj yog tag nrho cov nqi nruab, suav nrog qhov chaw thiab cov qauv tsim. Thaum ib qho chaw uas twb muaj lawm tsis muaj chaw rau ib tug loj PTFE exchanger, graphite lub compactness tsis yog ib qho kev txhim kho- nws tuaj yeem yog qhov tseem ceeb uas ua rau corrosion-resistant tshav kub hloov tau.
