Lub Dub Speck Tsis Paub
Tus kws kho mob sau cov qauv niaj hnub condensate los ntawm PTFE lub tshuab hluav taws xob hloov hluav taws xob ceeb toom cov xim dub uas raug tshem tawm hauv cov kua ntshiab. Cov khoom me me -feem ntau hauv qab 0.1mm- thiab maj mam maj mam. Lawv tawm ntawm qhov tsaus nti smudge thaum rubbed ntawm cov ntiv tes. Qhov kev txhawj xeeb tam sim: puas yog PTFE degrading? Puas yog lub tshav kub exchanger ua tsis tiav?
Cov lus teb feem ntau tsis yog. PTFE tsis tsim cov khoom dub thaum nws degrades. Thermal decomposition ntawm PTFE ntawm qhov kub siab tshaj 260℃ua cov khoom dawb los yog xim tsis muaj xim, tsis yog cov khib nyiab dub. Cov xim dub tshwm sim nyob rau lwm qhov hauv chav dej. Tab sis lawv lub xub ntiag nyob rau hauv condensate los ntawm qhov sib txawv tshwj xeeb xav tau kev tshawb nrhiav los txheeb xyuas qhov chaw thiab tiv thaiv cov khoom los ntawm kev cuam tshuam rau cov khoom siv hauv qab los yog, yog tias cov khoom siv pauv tau siv rau hauv cov txheej txheem kaw - voj voog, paug cov khoom.
Ib txoj hauv kev kuaj xyuas kab ke taug qab cov khoom mus rau lawv lub hauv paus chiv keeb thiab txiav txim siab seb lawv puas qhia qhov teeb meem uas yuav tsum tau kho.
Kev kuaj mob sib txawv
Dub hais nyob rau hauv chav condensate muaj plaub lub hauv paus chiv keeb nyob rau hauv ib tug system nrog ib tug PTFE tshav kub exchanger. Txhua tus tsim cov khoom uas muaj cov yam ntxwv sib txawv uas qhia kev kuaj mob.
Steam piping corrosion khoom: Hlau oxide (magnetite, Fe₃O₄) los ntawm sab hauv corrosion ntawm steel chav piping yog qhov ntau tshaj plaws. Magnetite cov ntaub ntawv raws li ib tug dub, sib nqus hmoov uas yog ntom thiab settles sai heev. Nws yog attracted rau ib tug hlau nplaum- ib qho yooj yim teb xeem uas txawv nws los ntawm lwm yam dub hais.
Boiler carryover: Boiler dej muaj cov khoom tawg thiab tshem tawm. Thaum lub sij hawm thauj khoom, boiler dej droplets nkag mus rau hauv lub chav nqa cov khib nyiab mus rau hauv chav dej. Cov khoom muaj xws li boiler kho tshuaj, hardness precipitates, thiab corrosion khoom. Lawv zoo nkaus li zoo, feem ntau brownish - cov hmoov dub.
Elastomer degradation: Gaskets, O-rings, thiab valve lub rooj zaum hauv chav dej yog ua los ntawm EPDM, PTFE, lossis lwm yam elastomers. Thermal thiab tshuaj degradation ntawm cov ntaub ntawv no ua rau dub, rubbery hais uas yog compressible thiab tej zaum nplaum. Lawv tsis nyob twj ywm sai li magnetite thiab tsis yog-magnetic.
Kev sib kis sab nraud tau qhia thaum lub sijhawm tu: Av av, txiav cov roj seem, lossis cov hlau shavings qhia thaum lub sijhawm hloov cov kav dej lossis kev kho dua tshiab tshwm sim hauv cov condensate tom qab ua haujlwm tiav. Lub sij hawm ntawm particle zoo li tus txheeb ze rau kev saib xyuas cov haujlwm yog kuaj xyuas.
| Particle yam ntxwv | Chav Piping Corrosion | Boiler Nqa | Elastomer degradation | PTFE Degradation (tsis tshua muaj) |
|---|---|---|---|---|
| Xim | Dub (magnetite) | Brownish-dub | Dub | Dawb los yog tsis muaj xim (tsis dub) |
| Sib nqus teb | Muaj zog sib nqus | Magnetic tsis muaj zog | Tsis yog-magnetic | Tsis yog-magnetic |
| Kev ntxhib los mos | Nyuaj, gritty | Zoo, hmoov | Rubbery, compressible | N/A |
| Kev daws teeb meem | Ceev (dense) | Nruab nrab | Slow (tsawg ceev) | N/A |
| Particle zoo nyob rau hauv microscope | Angular, crystalline | Irregular, agglomerated | Rounded, qee zaum fibrous | N/A |
| Lub sijhawm sib raug zoo | Nruam; nce nrog lub hnub nyoog kav | Sib nrug deb; correlates nrog boiler theem fluctuations | Kev vam meej; nce nrog lub hnub nyoog gasket | N/A |
Txheeb xyuas PTFE Tsis Yog Qhov Chaw
Qhov kev ntsuam xyuas meej kom txiav txim siab tawm ntawm PTFE cov khoom siv hluav taws xob raws li cov khoom siv yog ib qho ua ntej - thiab - tom qab sib piv. Nruab ib lub strainer los yog lim dej ntws ntawm tus exchanger thiab lwm yam downstream. Yog hais tias cov khoom yog tam sim no downstream tab sis tsis upstream, lub exchanger yog generating lawv. Yog hais tias muaj nyob rau ntawm ob qhov chaw, lub hauv paus yog ntws.
Rau PTFE tshwj xeeb, tshuaj ntsuam xyuas cov khoom los ntawm FTIR spectroscopy tuaj yeem txheeb xyuas seb lawv puas muaj fluoropolymer. PTFE muaj cov yam ntxwv nqus spectrum uas yog qhov tsis muaj tseeb. Yog tias FTIR spectrum ntawm cov khoom tsis sib xws PTFE, tus exchanger yog exonerated.
Nyob rau hauv kev xyaum, PTFE tshav kub exchangers yuav luag tsis tsim dub hais. Cov khoom siv degradation cov khoom yog gaseous los yog dawb. Cov xim dub tau taug qab mus rau PTFE exchanger tau pom tsis tau los ntawm cov khoom siv hlau sab saud thiab tsuas yog dhau los ntawm kev sib pauv.
Kho Kev Ua Los Ntawm Qhov Chaw
Thaum lub particle qhov chaw raug txheeb xyuas, kev kho kom raug raws li. Rau chav piping corrosion: txhim kho boiler dej kho kom nce pH thiab txo cov pa oxygen; installation ntawm chav strainer upstream ntawm cov khoom rhiab heev. Rau boiler nqa: boiler theem tswj kev hloov kho; anti- ua npuas ncauj kho; Chav Separator installation. Rau elastomer degradation: hloov cov roj hmab degraded thiab cov ntsaws ruaj ruaj nrog siab -kub- cov ntaub ntawv ntsuas tau sib xws nrog cov kev pabcuam chav.
Lub PTFE kub exchanger nws tus kheej yuav tsum tsis muaj kev kho kom raug- tsuas yog kev lees paub tias nws tsis yog qhov chaw, uas cov txheej txheem kuaj mob muab.
Cov ntsiab lus
Cov khoom dub zoo nyob rau hauv PTFE heat exchanger condensate los ntawm cov khoom siv hluav taws xob sab saud -corroding steel piping, boiler nqa, lossis degrading elastomers- tsis yog los ntawm PTFE nws tus kheej. PTFE thermal decomposition tsim cov khoom siv roj av dawb, tsis yog cov khib nyiab dub. Kev kuaj mob zoo siv cov kev ntsuam xyuas sib nqus, microscopy, ua ntej - thiab - tom qab pom, thiab FTIR spectroscopy txheeb xyuas qhov tseeb thiab qhia kev kho. Lub PTFE tshav kub exchanger yuav luag tsis yog qhov chaw.
Kev txhawb nqa engineering rau condensate particle qhov kev txheeb xyuas muaj nyob rau thaum xa cov qauv piv txwv, kev teeb tsa chav dej, cov ntsiab lus kho dej boiler, thiab txhua yam kev saib xyuas tsis ntev los no.
