Qhov sib txawv ntawm Molecular Uas Tsav Qhov Tsis Txaus Siab
Qhov sib txawv ntawm PTFE thiab PVDF yog nyob rau hauv cov pa roj carbon -hydrogen bonds. PVDF yog copolymer ntawm vinylidene fluoride, thiab nws cov qauv molecular muaj cov pa roj carbon -hydrogen bonds uas tsis muaj nyob rau hauv PTFE. Cov pa roj carbon-hydrogen daim ntawv cog lus tsis muaj zog dua li cov pa roj carbon- fluorine daim ntawv cog lus, thiab nws yog qhov chaw uas oxidation nres pib.
PTFE muaj cov fluorinated carbon bone uas tsis muaj carbon-hydrogen bonds. Cov pa roj carbon - fluorine daim ntawv cog lus yog ib qho muaj zog tshaj plaws hauv cov organic chemistry, nrog lub zog ntawm kev sib cog lus kwv yees li 485 kJ / mol. Oxidizing acids tsis muaj lub zog txaus los rhuav tshem cov ntawv cog lus ntawm qhov kub hauv qab 260 degree.
PVDF muaj cov pa roj carbon -hydrogen bonds nrog ib daim ntawv cog lus zog ntawm kwv yees li 413 kJ / mol. Qhov sib txawv yog kwv yees li 15%, tab sis qhov ua tau zoo ntawm cov oxidation tsis kam yog qhov loj dua. Kev tawm tsam oxidation ntawm PVDF pib ntawm cov pa roj carbon -hydrogen bond, thiab cov degradation propagates raws cov saw hlau polymer. oxidation tus nqi nce nrog kub thiab nrog cov concentration ntawm oxidizing acid.
Kev sib piv ntawm Oxidizing Acid Resistance
Qhov tsis kam ntawm PTFE thiab PVDF rau oxidizing acids nyob ntawm cov kua qaub, qhov concentration, thiab qhov kub thiab txias.
Nitric acid.PTFE resists nitric acid ntawm concentrations txog li 70% thiab kub txog li 200 degree. PVDF tiv taus nitric acid ntawm ntau txog 50% thiab kub txog li 100 degree. Tshaj li cov kev txwv no, PVDF raug tawm tsam, thiab cov khoom degrades.
Chromic acid.PTFE resists chromic acid ntawm concentrations txog li 50% thiab kub txog li 150 degree. PVDF resists chromic acid ntawm concentrations txog 30% thiab kub txog li 80 degree. Tshaj li cov kev txwv no, PVDF raug tawm tsam, thiab cov khoom tawg thiab tawg.
Perchloric acid.PTFE resists perchloric acid ntawm concentrations txog li 70% thiab kub txog li 150 degree. PVDF tiv taus perchloric acid ntawm qhov siab txog 30% thiab kub txog 60 degree. Perchloric acid tshwj xeeb yog nruj rau PVDF vim nws muaj zog oxidizing muaj peev xwm.
Hydrogen peroxide.PTFE tiv thaiv hydrogen peroxide ntawm qhov siab txog li 50% thiab kub txog li 100 degree. PVDF tiv thaiv hydrogen peroxide ntawm qhov siab txog 30% thiab kub txog 60 degree. Lub decomposition ntawm hydrogen peroxide generates oxygen radicals tawm tsam PVDF.
Kev sib piv ntawm Thermal Conductivity
PTFE thiab PVDF muaj cov thermal conductivity zoo sib xws. PTFE muaj conductivity ntawm 0.25 W / m·K, thiab PVDF muaj ib tug conductivity ntawm 0.19 W / m·K. Qhov sib txawv me me, thiab nws tsis cuam tshuam rau thaj chaw uas yuav tsum tau muaj rau qhov muab cua sov.
Tag nrho cov tshav kub hloov coefficient rau ob qho tib si yog dominated los ntawm cov kua zaj duab xis resistances, tsis yog los ntawm phab ntsa. Hauv cov kua - mus rau - cov kev pabcuam ua kua, tag nrho cov coefficient rau PTFE heat exchanger feem ntau yog 200–300 W/m²·K, thiab cov coefficient rau PVDF heat exchanger feem ntau yog 180–280 W/m²·K. Qhov sib txawv yog tsawg dua 10%, uas yog nyob rau hauv qhov tsis paub meej ntawm kev ntsuas kub hloov pauv.
Kev sib piv thermal conductivity yog li ntawd tsis nyiam cov khoom siv hauv ib txoj kev muaj txiaj ntsig. Kev xaiv yuav tsum yog raws li cov tshuaj sib xyaw ua ke thiab cov khoom siv kho tshuab.
Sib piv ob cov ntaub ntawv hauv Oxidizing Acid Service
Cov lus hauv qab no qhia txog qhov ua tau zoo thiab tus nqi ntawm PTFE thiab PVDF cov khoom siv hluav taws xob hauv oxidizing acid ntawm 60℃nrog 30% nitric acid.
| Yam ntxwv | PTFE Thaum tshav kub kub Exchanger | PVDF Kub Exchanger | Qhov zoo |
|---|---|---|---|
| Thermal conductivity | 0.25 W/m·K | 0.19 W/m·K | PTFE |
| Tag nrho cov tshav kub hloov coefficient | 250 W/m²·K | 230 W/m²·K | PTFE |
| Ua haujlwm kub siab tshaj plaws | 260 degree | 150 degree | PTFE |
| Nitric acid kuj txwv | 70% ntawm 200 degree | 50% ntawm 100 degree | PTFE |
| Chromic acid kuj txwv | 50% ntawm 150 degree | 30% ntawm 80 degree | PTFE |
| Perchloric acid kuj txwv | 70% ntawm 150 degree | 30% ntawm 60 degree | PTFE |
| Hydrogen peroxide kuj txwv | 50% ntawm 100 degree | 30% ntawm 60 degree | PTFE |
| Mechanical zog | Nruab nrab | Siab | PVDF |
| Kev ua haujlwm siab tshaj plaws | 0.5MPa | 1.0 MPa siab | PVDF |
| Kev pabcuam lub neej hauv oxidizing acid kev pabcuam | 12-18 xyoo | 5–8 xyoo | PTFE |
| Tus nqi peev rau 30 kW lub luag haujlwm | $28,000 | $19,000 | PVDF |
| Installation nqi | $3,000 | $3,000 | Sib npaug |
| Tus nqi tu txhua xyoo | $1,500 | $3,500 | PTFE |
| Tsib -xyoo tus nqi tag nrho | $47,500 | $53,000 | PTFE |
Tsib -xyoo tag nrho cov nqi tsim nyog suav tias yog tus nqi tsim khoom ntawm $ 500 toj ib teev thiab suav nrog tus nqi peev, tus nqi teeb tsa, thiab tus nqi tu ntau tshaj tsib xyoos.
Thaum PVDF yog qhov kev xaiv zoo dua
PVDF yog qhov kev xaiv zoo dua hauv ntau daim ntawv thov tshwj xeeb.
Tsawg-kev pabcuam kub.Thaum kub qis dua 40 degree, PVDF tiv taus feem ntau oxidizing acids yam tsis muaj teeb meem, thiab tus nqi qis dua nyiam PVDF.
Tsawg- kev pabcuam siab.Ntawm cov concentrations qis dua 20%, PVDF tiv taus cov oxidizing acids feem ntau ntawm qhov kub txog li 60 degree, thiab cov nqi qis dua nyiam PVDF.
Siab - kev pabcuam siab.PVDF muaj zog txhua yam ntau dua li PTFE thiab tuaj yeem tiv taus siab dua. Rau oxidizing acid kev pab cuam ntawm siab tshaj 5 bar, PVDF tej zaum yuav yog tib txoj kev xaiv.
Tsis yog - kev pabcuam tseem ceeb.Thaum lub tshav kub exchanger tsis tseem ceeb rau cov txheej txheem thiab cov nqi hloov tau txais, PVDF muab kev ua tau zoo txaus ntawm tus nqi qis.
Lub neej ua haujlwm luv luv.Thaum lub tshav kub exchanger xav kom muaj kev pab cuam lub neej ntawm 5 xyoo los yog tsawg dua, PVDF yog txaus thiab tsis kim.
Thaum PTFE yog qhov kev xaiv zoo dua
PTFE yog qhov kev xaiv zoo dua hauv ntau daim ntawv thov tshwj xeeb.
Siab -kev pabcuam kub.Ntawm qhov kub siab tshaj 60 degree, PTFE tiv taus oxidizing acids zoo dua PVDF, thiab kev pab cuam lub neej ntev dua.
High - kev pabcuam siab.Ntawm qhov siab tshaj 30%, PTFE tiv taus oxidizing acids zoo dua PVDF.
Perchloric acid pab.PTFE tsuas yog siv tau fluoropolymer rau perchloric acid kev pab vim PVDF raug tawm tsam ntawm qis concentration thiab kub.
Lub neej ua haujlwm ntev yuav tsum tau ua.Thaum lub tshav kub exchanger xav kom muaj kev pab cuam lub neej ntawm 10 xyoo los yog ntau tshaj, PTFE yog qhov kev xaiv zoo dua vim tias nws tiv thaiv cov tshuaj tua kab mob ntev dua.
Kev pabcuam tseem ceeb.Thaum lub tshav kub exchanger yog ib qho tseem ceeb rau cov txheej txheem thiab tus nqi downtime yog siab, PTFE yog qhov kev xaiv zoo dua vim hais tias nws muaj tsawg dua qhov yuav ua tsis tau.
Tsim Cov Nta Uas Ntxiv Kev Pabcuam Lub Neej
Ntau tus qauv tsim txuas ntxiv lub neej kev pab cuam ntawm ob qho tib si PTFE thiab PVDF tshav kub exchangers hauv oxidizing acid kev pab.
Ua haujlwm kub qis dua.Txo qhov kev khiav hauj lwm kub txo cov oxidation tus nqi thiab ncua lub neej kev pab cuam ntawm ob yam ntaub ntawv.
Tsawg concentration.Txo cov acid concentration txo cov oxidation tus nqi thiab ncua lub neej kev pab cuam.
Flow ceev tswj.Kev tswj xyuas qhov nrawm nrawm txo qis ciam teb txheej tuab thiab cov concentration ntawm oxidizing hom ntawm lub raj nto.
Hauv - qhov chaw tu cov txheej txheem.Kev sib txuas rau kev ntxuav cov khoom siv thiab xa rov qab tso cai rau cov khoom siv hluav taws xob kom huv si yam tsis muaj disassembly, uas txo cov sij hawm poob thiab cov khoom poob.
Kev ntsuas kub.Kub sensors ntawm lub tshav kub exchanger inlet thiab qhov hluav taws xob tso cai rau lub tshav kub hloov kev ua tau zoo saib xyuas, uas tso cai rau thaum ntxov nrhiav tau ntawm fouling los yog degradation.
Specification Parameters rau Oxidizing Acid Service
Cov cuab yeej siv hluav taws xob ntsuas PTFE thiab PVDF cov khoom siv hluav taws xob hloov pauv rau oxidizing acid yuav tsum paub meej cov kev txwv hauv qab no nrog tus neeg muag khoom.
Acid chemistry.Qhia kom meej cov acid muaj pes tsawg leeg, suav nrog cov concentration thiab cov kab mob.
Ua haujlwm kub.Qhia qhov siab tshaj plaws kev khiav hauj lwm kub thiab qhov kev cia siab kub profile.
Kev khiav hauj lwm siab.Qhia qhov siab tshaj plaws kev khiav hauj lwm siab.
Thaum tshav kub kub load thiab nto cheeb tsam.Qhia kom meej lub tshav kub load thiab qhov chaw saum npoo yuav tsum tau rau txhua qhov kev xaiv khoom.
Tshuaj compatibility.Paub meej tias cov khoom siv tau sib xws nrog cov kua qaub tshwj xeeb ntawm kev ua haujlwm kub thiab siab.
Kev pabcuam lub neej xav tau.Qhia txog lub neej kev pab cuam thiab lub sijhawm hloov pauv.
Kev tu muaj peev xwm.Qhia meej txog kev tu lub peev xwm ntawm qhov chaw, suav nrog lub peev xwm los kho cov khoom siv hluav taws xob ntawm qhov chaw.
Tus nqi tsim khoom thiab tus nqi qis.Muab tus nqi tsim khoom thiab tus nqi poob qis kom tag nrho cov nqi ntawm kev txheeb xyuas cov tswv cuab tuaj yeem raug kho raws li qhov chaw.
Sib piv cov khoom xaiv rau Oxidizing Acid Service Conditions
Kev xaiv ntawm PTFE thiab PVDF cua kub exchangers nyob rau hauv oxidizing acid kev pab cuam nyob ntawm cov kua qaub chemistry, qhov kub thiab txias, qhov concentration, thiab cov kev pab cuam lub neej yuav tsum tau. PVDF muaj tus nqi qis dua thiab muaj zog dua txhua yam, tab sis nws muaj kev cuam tshuam ntau dua rau oxidation nres ntawm qhov kub thiab txias. PTFE muaj tus nqi peev ntau dua tab sis lub neej kev pabcuam ntev dua hauv kev pabcuam oxidizing acid hnyav.
Kev txiav txim siab xaiv yuav tsum yog nyob ntawm qhov chaw- kev tshuaj xyuas tshwj xeeb uas suav nrog tus nqi peev, tus nqi saib xyuas, thiab kev tsim khoom poob. Ib daim ntawv qhia yooj yooj yim nrog rau cov nqi no muab cov ntaub ntawv xav tau los txiav txim siab.
Rau oxidizing acid cov chaw pabcuam kev ntsuas kev xaiv cov khoom siv hluav taws xob, kev xaiv cov khoom siv yuav tsum yog raws li tag nrho cov nqi ntawm cov tswv cuab ntawm lub neej kev pabcuam, tsis yog tus nqi peev xwb. PVDF chav tsev nrog tus nqi qis dua tuaj yeem muaj tus nqi siab dua lub neej yog tias nws yuav tsum tau hloov ntau zaus.
Cov cuab yeej siv hluav taws xob thiab cov kws tshaj lij kev muag khoom ntsuas PTFE cov khoom siv hluav taws xob tshwj xeeb rau oxidizing acid lossis lwm yam kev pabcuam corrosive tuaj yeem thov kev tshuaj xyuas tsim los npog cov kua qaub chemistry, kev ua haujlwm kub, kev khiav hauj lwm siab, tshuaj lom neeg, thiab kev pabcuam lub neej kom paub meej tias cov khoom xaiv tau sib haum rau cov kev pabcuam tiag tiag thiab cov qauv nqi ntawm qhov chaw.
