Yuav Ua Li Cas Block -Style Graphite Thaum tshav kub kub Exchanger Piv rau PTFE Plhaub-thiab-Tube Unit?

Thaum txhais cov khoom siv hluav taws xob rau cov kua qaub heev, ob qho kev xaiv tsis yog -nws yog xim hlau feem ntau tuaj rau hauv kev ua si: graphite block exchangers thiab PTFE plhaub- thiab - raj exchangers. Ob leeg tiv taus corrosion tab sis lawv cov thermal thiab mechanical zog ua rau lawv haum rau ntau yam kev siv. Nkag siab txog kev ua lag luam- tawm ntawm kev sib cog lus, kev ua haujlwm thermal, tshuaj lom neeg sib raug zoo thiab kev ua haujlwm zoo yog qhov teeb meem tseem ceeb rau kev xaiv cov cuab yeej tsim nyog.

Tsim Txheej Txheem: Graphite Block vs. PTFE Plhaub thiab Tube
Graphite block heat exchangers yog ua los ntawm ib los yog ntau lub blocks ntawm impermeable graphite (resin impregnated graphite). Txhua qhov thaiv yog drilled nrog ob txheej ntawm txoj kev, ib qho rau cov txheej txheem corrosive thiab ib qho rau cov kua dej (dej txias, chav dej lossis cua sov nruab nrab). Cov blocks txuas ua ke siv graphite-cov nplaum nplaum los yog nrog cov khoom sib txuas. Nyob ntawm tus qauv drilling, cov kua dej ntws los ntawm cov hlab hauv tus ntoo khaub lig- ntws los yog counter-flow configuration.

PTFE plhaub-thiab- raj kub exchangers yog tsim los ntawm ib pob ntawm nyias-walled PTFE (polytetrafluoroethylene) raj, uas muaj nyob rau hauv ib tug hlau los yog yas plhaub. Cov kua dej corrosive taug kev los ntawm PTFE hlab (los yog nyob ib ncig ntawm lawv) thaum cov kua dej ntws mus rau sab nraud. Intermediate baffles feem ntau yog siv los txhawb cov hlab PTFE. Lub raj ntim ntim tau ntim rau ntawm cov ntawv raj nrog lub raj txuas txuas los yog compression fittings.

Ob qho qauv tsim txawv hauv ib txoj hauv kev loj, uas yog kev hloov kho tshuab. Graphite blocks yog ruaj thiab unyielding. PTFE hlab yog hloov tau thiab tuaj yeem tiv taus kev vibrations me me thiab thermal expansions yam tsis muaj kev puas tsuaj.

Graphite's Big Plus: Thermal conductivity
Qhov sib txawv tseem ceeb tshaj plaws yog nyob rau hauv thermal conductivity. Graphite muaj thermal conductivity ntawm ib ncig ntawm 80-120W/mK (raws li Graphite qib thiab impregnation resin). PTFE, txawm li cas los xij, muaj cov thermal conductivity ntawm ib ncig ntawm 0.25 W / m K-txog 300 txog 400 npaug qis dua graphite.

Qhov sib txawv loj no txhais tau hais tias graphite block exchanger tuaj yeem ua tau zoo heev rau tib lub luag haujlwm hloov hluav taws xob. Chav tsev graphite yog ib qho -feem kaum lub ntim ntawm lub plhaub thiab lub raj hom PTFE chav tsev nrog sib npaug thermal ua haujlwm. Graphite blocks muab qhov zoo sib xws hauv qhov chaw txwv, xws li kev rov qab mus rau cov khoom siv uas twb muaj lawm lossis txuas rau ntawm cov txheej txheem skids.

Hloov pauv, qhov qis thermal conductivity ntawm PTFE txhais tau hais tias lub plhaub - thiab - raj kub exchangers nrog PTFE hlab xav tau cov kub hloov mus rau qhov chaw. Qhov no ua rau cov hneev taw loj dua, cov hlua ntev dua thiab cov plhaub loj dua. Hauv kev xyaum, PTFE exchangers feem ntau tsuas yog yuav tsum tau qhov twg lawv cov tshuaj tiv thaiv tshwj xeeb them rau lawv qhov loj me me.

Mechanical zog: brittle los yog saj zawg zog
Graphite yog ib yam khoom nkig. Impervious graphite muaj zog dua cov graphite nyoos tsis tau nws kuj tuaj yeem tawg los ntawm:

Mechanical shock (xws li poob lub cuab tam, ceev cov yeeb nkab txav)

Cov dej rauj nyob rau hauv txoj kab siv dej

Kev sib tw thermal heev (ua kom sov sai lossis txias, tshwj xeeb tshaj yog nrog qhov sib txawv ntawm qhov kub siab tshaj qhov txwv tau teev tseg los ntawm cov chaw tsim khoom)

Tsis sib npaug bolt torque hauv flanges lossis headers

Yog hais tias lub graphite blocks tawg, lub exchanger feem ntau tsis tuaj yeem kho. Qhov tawg tuaj yeem ua rau hla - leakage ntawm cov txheej txheem thiab cov khoom siv hluav taws xob hluav taws xob lossis cov xau sab nraud. Tib txoj kev los kho nws yog los hloov cov txheej thaiv tag. Qhov no feem ntau yog kev nqis peev loj.

PTFE raj, ntawm qhov tod tes, yog hloov tau thiab ruaj khov. Cov dej rauj nruab nrab, kev co thiab thermal cycling tuaj yeem ua rau tsis muaj kev puas tsuaj. Yog hais tias ib qho PTFE raj xau (vim kev puas tsuaj los yog cov khoom siv sib tsoo piv txwv), feem ntau nws tuaj yeem raug kaw ntawm ob lub raj xaim thiab lwm cov raj tuaj yeem siv tau. Qee cov qauv tsim tso cai rau cov raj hloov pauv, txawm li cas los xij qhov no yog kev siv zog ntau. Kev zam txim rau tus neeg kho tshuab tus cwj pwm ntawm PTFE ua rau cov khoom sib pauv no tsim nyog rau cov nroj tsuag uas tsis tshua muaj kev tswj hwm ntawm kev ruaj ntseg txaus lossis kub ramping.

Tshuaj tiv thaiv: ntau yam ntawm PTFE
Ob leeg graphite thiab PTFE yog resistant rau ntau yam corrosive acids tab sis muaj ntau qhov sib txawv tseem ceeb.

Tau tshaj: Graphite (qib impervious)

Hydrochloric acid (tag nrho cov concentrations txog rau boiling point)

Sulfuric acid (txog li 80-85% ntawm qhov kub nruab nrab; qhov loj dua yuav tsum tau ceev faj xaiv)

Phosphoric acid 12.

- Organic acids.

Graphite puas, txawm li cas los xij, los ntawm cov oxidizing muaj zog xws li:

Nitric acid (tshwj xeeb yog concentrated los yog rhuab)

Chromic acid (Chromic acid)

Xav tau aqua regia

Cov kua qaub sib xyaw nrog chlorine lossis bromine dawb

Oxidising chemicals nkag mus rau hauv graphite qauv thiab tsim intergranular corrosion, ua rau tsis ua hauj lwm ceev. Graphite exchangers yuav tsum tsis txhob siv nyob rau hauv cov kev pab cuam tshwj tsis yog cov chaw tsim tshuaj paus tau txais kev pom zoo rau ib tug tshwj xeeb graphite qib (phenolic-impregnated v. furan-impregnated, nrog rau kev txwv tseem siv).

PTFE yuav luag tag nrho cov tshuaj tiv thaiv tsuas yog molten alkali hlau thiab elemental fluorine ntawm qhov kub thiab txias. PTFE yog resistant rau nitric acid, chromic acid thiab tag nrho lwm yam oxidising acids xyaum nyob rau hauv tag nrho cov concentrations. Nws kuj tiv taus cov kuab tshuaj organic, tshuaj chlorine thiab cov txheej txheem feem ntau pom nyob rau hauv qhov chaw tiav thiab kev ua tshuaj lom neeg. Rau kev sib xyaw ua siab phem (piv txwv li, aqua regia, kub concentrated nitric acid los yog tov acid pickling solutions) PTFE yog qee zaum tsuas yog ua tsis tau - xim hlau xaiv.

Property Graphite Block Heat Exchanger PTFE Plhaub-thiab-Tube Thaum tshav kub kub Exchanger
Thermal conductivity (W/mK) 80 – 120 0.25
Tus txheeb ze loj rau tib lub luag haujlwm Compact (1x lub hauv paus) Loj (10-15 × loj)
Qhov siab tshaj qhov kub tsis tu ncua 180-200℃(resin dependant) ~ 110℃(PTFE creep txwv)
Mechanical cwj pwm Brittle, so nrog poob siab los yog dej rauj Flexible, resistant rau kev co thiab thermal cycling
Kev Kho Feem ntau tsis kho yog tias thaiv cov kab nrib pleb tuaj yeem raug thaiv lossis hloov ib tus zuj zus
Kev tiv thaiv oxidising acids (nitric, chromic) Tsis zoo, tsis pom zoo; resistant tag nrho
Cov ntawv thov H2SO4 txias HCl cua sov / txias Organic acid serviceMixed acid pickling, aqua regia, chlorine-muaj cov tshuaj, plating da dej
Tus nqi pib (tus txheeb ze) Siab dua (tsuas yog tsim khoom) Nruab nrab mus rau qis
Kev txwv kub
Graphite block exchangers, thaum tsim nyog impregnated nrog resins (feem ntau phenolic lossis furan), tuaj yeem ua haujlwm tsis tu ncua ntawm qhov kub txog li 180-200 degree. Qee cov qhab nia tshwj xeeb raug ntsuas txog li 220 degree. Qhov no ua rau graphite tsim nyog rau cua sov los yog txias concentrated sulfuric acid, kub hydrochloric acid vapor thiab lwm yam siab -kub corrosive ntws.

PTFE plhaub thiab raj kub exchangers yog txwv rau ib ncig ntawm 110℃rau kev siv tas mus li. Saum toj no qhov kub thiab txias PTFE pib tsis muaj zog thiab nkag mus rau hauv lub siab sib txawv nyob rau hauv lub raj phab ntsa. Kev mus ncig luv luv mus rau 120-130℃tuaj yeem zam tau, tab sis qhov ntev ntawm qhov kub siab ua rau lub raj deformation, xau ntawm cov pob qij txha thiab qhov kawg ua tsis tiav. Rau corrosive lub luag hauj lwm ntawm qhov kub siab tshaj 110 degree, graphite feem ntau yog tsuas yog tsis yog-hlau lwm txoj kev, los yog ib tug hlau exchanger nrog txawv txawv alloy hauv ob sab phlu yuav tsum tau tshawb xyuas.

Nqi thiab Kev Kho Cov Teeb Meem
Thawj tus nqi ntawm graphite thaiv cov khoom siv hluav taws xob feem ntau yog ntau dua li ntawm PTFE lub plhaub thiab lub raj ntawm tib lub luag haujlwm thermal. Graphite blocks yuav tsum tau precision drilling, tshwj xeeb kev sib txuas cov txheej txheem thiab ua tib zoo saib xyuas. PTFE raj bundles yog tsim nyob rau hauv loj tus naj npawb ntawm tsawg cov khoom thiab fabrication nqi.

Tab sis tus nqi tag nrho ntawm kev ua tswv cuab yog qhov kev thov nyob ntawm. Lub graphite exchanger tuaj yeem ua haujlwm tau ntau xyoo tsis muaj teeb meem hauv kev ua haujlwm huv, ruaj khov acid, tsis muaj kev cuam tshuam los yog cov tshuaj oxidizing. Nws cov nqi pib ntau dua yog tsim nyog los ntawm nws qhov loj me thiab thermal efficiency. Nyob rau hauv ib qho kev pab cuam uas dej pounding los yog thermal cycling yog inevitable, qhov txaus ntshai ntawm graphite cracking yuav ua rau ntau zam txim rau PTFE kev tsim dua, txawm nyob rau ntawm tus nqi ntawm ib tug loj exchanger.

Kev tu cov txheej txheem kuj txawv me ntsis. Cov khoom siv Graphite yuav tsum tau pib ua tib zoo pib-nce thiab kaw- cov txheej txheem kom tsis txhob muaj cua sov. Strainers feem ntau qhia rau ntawm qhov kev pab cuam dej kom cov khib nyiab los ntawm fouling lub ntsej muag thaiv. PTFE exchangers yog tsawg rhiab heev rau ntws cuam tshuam, tab sis yuav tsum tau muab ntxuav ib ntus yog hais tias lub me me diameters foul. Lub zog qis ntawm PTFE (piv txwv li hauv seem yav dhau los) yog qhov zoo dua hauv kev txo cov fouling, txawm li cas los xij PTFE hlab tuaj yeem raug kho los ntawm mechanically.

Daim Ntawv Qhia Txog Kev Txiav Txim: Xaiv Txoj Cai Txiaj Ntsig rau Daim Ntawv Thov?
Qhov kev txiav txim siab ntawm graphite block thiab PTFE plhaub - thiab - raj kub exchanger nyob ntawm ntau daim ntawv thov - cov qauv tshwj xeeb.

Xav txog graphite block exchanger nyob rau hauv rooj plaub ntawm:

Nws yuav tsum tau compact vim qhov chaw txwv.

Cov txheej txheem kub yog siab tshaj 110℃thiab qis dua 200 degree.

Cov kua corrosive yog sulfuric acid, hydrochloric acid, los yog tsis yog -oxidizing organic acid.

Cov dej ua haujlwm yog ntshiab thiab tsis muaj dej rauj thiab khib nyiab.

Kev tsim qauv tsim nyog tuaj yeem tiv thaiv kev poob siab thiab kev kub ceev ceev.

Ib chav tsev me me, ua kom muaj cua sov ntau dua yog qhov tsim nyog yog tias tsim nyog yuav tsum muaj peev txheej loj dua.

Xaiv lub plhaub PTFE thiab lub raj xa tawm thaum:

Cov kua dej muaj zog oxidising cov neeg ua haujlwm (nitric acid, chromic acid, aqua regia, mixed acids).

Cov txheej txheem kub yog tsawg dua 110 degree.

Cov kav dej yuav tiv taus dej rauj, kev co lossis kev caij tsheb kauj vab ntau zaus.

Mechanical robustness thiab zam kev ua haujlwm yog qhov tseem ceeb tshaj qhov compactness.

Kev ntshaw yog tus nqi pib qis dua thiab muaj peev xwm ntsaws lossis hloov cov raj ntawm tus kheej.

Chav txaus muaj rau qhov loj dua exchanger hneev taw.

Nyob rau hauv kev xyaum, ntau cov txheej txheem tshuaj nroj tsuag khiav ob hom. Graphite exchangers yog dav siv nyob rau hauv sulfuric acid txias kev pab cuam thiab hydrochloric acid cua sov circuits. PTFE exchangers yog qhov kev xaiv zoo tshaj plaws rau cov kab sib xyaw acid pickling, electroplating da dej cua sov / txias, thiab kev kho cov kua qaub pov tseg qhov twg oxidising hom muaj.

Xaus: Ib qho Kev Txiav Txim Siab Tsis Zoo
Ob qhov thaiv tsim graphite tshav kub exchangers thiab PTFE plhaub thiab tube units yog zoo suited rau lub corrosive tshav kub kev lag luam, tab sis lawv yog ib qho tseem ceeb sib txawv nyob rau hauv lawv lub zog thiab shortcomings. Graphite yog qhov zoo rau nws cov thermal conductivity thiab loj, tab sis nws yog nkig, kim pib nrog thiab rhiab heev rau oxidising acids. PTFE muaj unsurpassed tshuaj tiv thaiv thiab txhua yam yooj yooj yim ntawm tus nqi qis. Txawm li cas los xij, nws muaj qhov ntsuas kub ntawm 110℃thiab yuav tsum muaj qhov chaw loj dua.

Qhov kev xaiv cia siab rau cov kua qaub uas siv, qhov kub thiab txias ua haujlwm, ib puag ncig txhua yam thiab qhov chaw muaj. Kev xaiv cov khoom siv rau cov khoom siv hluav taws xob sib hloov hauv cov kev pabcuam corrosive yog ntau yam - ntsib teeb meem engineering suav nrog kev lag luam - tawm ntawm kev ua haujlwm thermal, tshuaj sib raug zoo, kev siv tshuab ua haujlwm ntev thiab lub neej- mus txog tus nqi. "Technology tsis yeej technology tag nrho, tab sis txhua lub tshuab muaj nws tus kheej niche qhov twg nws yog superior."