Yuav Ua Li Cas Tag Nrho Cov Hluav Taws Xob Hluav Taws Xob ntawm PFA Exchanger Piv rau PTFE Ib ntawm 150 degree?

Kub, corrosive txheej txheem kwj ntawm 150 degree. PTFE yog qhov raug fluoropolymer rau cov khoom siv hluav taws xob sib txawv tab sis yog qhov tsis zoo ntawm qhov kub no, nws yuav tsis muaj zog thiab ua tsis tiav. Nws nyob ze tshuaj npawg npawg PFA zoo kawg nkaus. Ob leeg cov ntaub ntawv yog cov insulators zoo heev, thiab lawv cov raw, lub peev xwm los ua cua sov yuav luag zoo sib xws. Lub thermal kom zoo dua ntawm PFA exchanger ntawm 150℃tsis yog vim nws yog ib tug superior conductor, tab sis tsuas yog vim hais tias ntawm qhov kub thiab txias nws tseem yog ib tug khoom, muaj zog tube, muaj peev xwm ua tau ib tug kub exchanger hauj lwm uas PTFE txawm tsis xav txog. Txhawm rau nkag siab txog qhov sib piv ntawm PFA piv rau PTFE cov hluav taws xob hloov hluav taws xob ntawm 150℃ib qho yuav tsum tau saib dhau ntawm tus lej thermal conductivity thiab tsom mus rau qhov siab tshaj plaws kev pabcuam kub.

Thermal conductivity: Ib qho khoom siv zoo tshaj plaws insulating
Cov thermal conductivity ntawm ob qho tib si PTFE (polytetrafluoroethylene) thiab PFA (perfluoroalkoxy alkane) yog nyob rau hauv thaj tsam ntawm 0.20 txog 0.25 W / m·K ntawm qhov kub thiab txias. Rau engineering lub hom phiaj cov lej no yog xyaum tsis paub qhov txawv. Cov thermal conductive ntawm ib lub raj uas muaj ob qho khoom siv yuav zoo ib yam rau tib lub thickness (piv txwv li, 1 hli rau lub raj me me los yog 2 hli rau lub plhaub loj thiab lub raj sib hloov). Yog li ntawd tag nrho cov tshav kub hloov pauv coefficient (U-tus nqi) ntawm PFA exchanger zoo ib yam li PTFE exchanger ntawm tib tus qauv, tsuav yog ob qho tib si siv nyob rau hauv lawv cov kev txwv ntawm qhov kub thiab txias.

Qhov tseem ceeb tshaj qhov zoo ntawm PFA yog qhov siab dua qhov kev pabcuam kub kub ntawm 260℃piv rau qhov kev txwv ntawm PTFE rau immersion heater lossis heat exchanger service uas yog li ntawm 110-120℃hauv aqueous ib puag ncig (thiab me ntsis siab dua hauv qee qhov qhuav lossis tsis-oxidizing). Qhov no ua rau PFA exchanger ua haujlwm ntawm 150℃nrog qhov sib txawv ntawm qhov sib txawv ntawm qhov ntsuas kub ntau dua (LMTD) rau tib txoj haujlwm, uas ua rau muaj qhov sib txawv me me thiab txuag hluav taws xob ntau dua. Qhov yeej tsis yog nyob rau hauv qhov ntau ntawm conductivity, tab sis nyob rau hauv lub peev xwm ntawm cov khoom siv los qhia txog kev sib ntaus.

PFA yeej qhov kev ua tsov rog kub, tsis yog vim nws khiav nrawm dua, tab sis vim nws tau tso cai rau ntawm txoj kev. Ntawm 150℃PTFE tsis muaj tus neeg sib tw - nws twb tau tawm ntawm qhov chaw.

Vim li cas PTFE tsis haum rau Kev Pabcuam Thaum tshav kub kub ntawm 150 degree
Mechanical softening thiab creep
Nyob rau hauv tas li immersion pab, PTFE pib tsis muaj zog thiab poob nws mechanical zog ntawm txog 110-120 degree. PTFE muaj qhov theoretical melting point ntawm 327℃tab sis dhau qhov kev hloov pauv crystalline ntawm ib ncig ntawm 19℃thiab dua li ntawm 30 degree, nrog rau thaj chaw amorphous pib nce mus txog qhov kub siab tshaj 100 degree. PTFE hlab ntawm 150℃yuav nkag, deform thiab nws thiaj li vau los yog tawg nyob rau hauv lub tshav kub exchangers qhov twg cov hlab yuav raug rau sab hauv siab, sab nraud siab thiab thermal expansion rog. Cov khoom siv kuj muaj cov coefficient siab ntawm thermal expansion (kwv yees li 10 npaug ntawm cov hlau) uas ua rau ntau dhau ntawm cov hlab ntsha thiab cov neeg kho tshuab qaug zog ntawm qhov kub thiab txias.

Tes- ntawm kev paub
PTFE tshav kub exchanger raj feem ntau teev los ntawm cov tuam ntxhab thiab cov kev paub dhau los kom muaj kev nyab xeeb kev ua haujlwm tsis tu ncua ntawm 110℃rau feem ntau cov kev pabcuam corrosive aqueous. Qee cov qauv tsim yuav ua tau zoo rau kev mus ncig luv luv txog 120 degree, tab sis 150℃zoo tshaj qhov kev nyab xeeb. Conversely, PFA khaws nws cov neeg kho tshuab kev ncaj ncees thiab tshuaj tiv thaiv mus txog 260 degree, tsis muaj cov theem hloov uas ua rau qhov seem tsis ruaj khov.

Tag Nrho Cov Hluav Taws Kub Kub Hloov Coefficient (U-Value) ntawm 150 degree
Sib npaug Design Similar U-Value
Nyob rau hauv ib qho kev xav uas PTFE tuaj yeem ruaj khov ntawm 150℃U- tus nqi ntawm PFA exchanger thiab PTFE exchanger ntawm tib lub geometrical tsis (tube txoj kab uas hla, phab ntsa thickness, raj layout thiab dej velocities) yuav zoo sib xws. Qhov hluav taws xob tsis kam ntawm lub raj phab ntsa tsuas yog ib feem ntawm tag nrho cov thermal kuj. Lwm qhov kev tawm tsam (tube-sab thiab plhaub- sab convection thiab fouling) yog tib yam rau tib yam kua dej thiab kev tshaj tawm. Cov thermal conductivities ntawm PTFE thiab PFA yog ze li ntawm qhov sib piv, yog li U- tus nqi muaj qhov sib txawv tsis ntau tshaj 5%.

Kev siv tau zoo: Siab dua LMTD
Kev sib piv cov tswv yim tsis yog ob yam khoom ntawm qhov kub thiab txias vim tias PTFE tsis tuaj yeem ua haujlwm ntawm 150 degree. Hloov pauv PFA tuaj yeem siv los ua kom txias 150℃kwj nrog, piv txwv li 30℃dej txias, uas muab LMTD txog 80-100 degree. Rau tib cov dej txias, ib qho PTFE exchanger, txwv rau sab kub inlet kub ntawm 110 oC, yuav muaj LMTD ntawm 40-50 oC. Lub PTFE exchanger yuav xav tau yuav luag ob zaug ntawm thaj chaw saum npoo los ua tib txoj haujlwm ntawm kev xa hluav taws xob - yog tias nws tuaj yeem ua haujlwm txhua. Tab sis qhov kev xaiv PTFE tsis muaj nyob rau qhov kub siab ntawm qhov tseeb.

Tswv yim rau kev xaiv
Parameter PTFE Exchanger PFA Exchanger
Max. Kev pabcuam kub kub (aqueous) 110-120℃260 degree
Thermal conductivity @ 150℃Tsis siv tau (khoom siv tsis tau) ~ 0.22 W / mK U-tus nqi (ntawm qhov sib npaug geometry thiab tib cov kua dej kub hauv PTFE's range) Baseline Sib piv (± 5%)
U-tus nqi (kub sab 150 degree) Tsim thiab LMTD Tsis ua tau
Tus nqi txheeb ze (ib cheeb tsam tsev) qis dua (15-30 tus nqi)
Haum rau kev kub siab corrosive serviceYes No
Xaus: Nws yog ib qho teeb meem ntawm kev ciaj sia
Qhov kom zoo dua ntawm PFA tshaj li PTFE exchanger ntawm qhov kub thiab txias tsis yog raw thermal kev ua tau zoo tab sis ib lo lus nug ntawm kev ciaj sia. PTFE softens, crawls thiab ua tsis tiav ntawm 150 degree, whereas PFA yog tawv, ruaj khov thiab chemically inert. Tag nrho cov thermal hloov coefficients ntawm ob cov ntaub ntawv yog zoo tib yam ntawm tib phab ntsa thickness tab sis qhov ntawd tsis muaj teeb meem vim PTFE tsis tuaj yeem siv ntawm qhov kub ntawd. PFA yog qhov sib tw thermal, tuaj yeem tiv taus cua sov. Cov khoom siv zoo tshaj plaws yog ib qho uas tseem sawv ntawm cov txheej txheem kub thiab rau 150℃corrosive kwj PFA yog cov khoom ntawd.