Caustic soda (sodium hydroxide, NaOH) yog cov tshuaj pob zeb hauv paus hauv cov txheej txheem kev lag luam suav tsis txheeb -los ntawm kev tsim tshuaj lom neeg thiab cov khoom siv pulp & ntawv mus rau kev kho dej thiab alumina refining. Thaum qhov tseem ceeb, nws nthuav tawm qhov kev sib tw tshwj xeeb thiab feem ntau tsis txaus ntseeg rau kev siv tshuab: kev ntxhov siab corrosion tawg (SCC).
Kev xaiv lub twj tso kua mis tsis raug rau NaOH kev pabcuam tuaj yeem ua rau muaj kev puas tsuaj loj, kev xau tsis zoo, thiab kev siv nyiaj tsis txaus. Cov lus qhia no txiav los ntawm qhov nyuaj, muab kev paub meej meej rau koj uas koj yuav tsum xaiv lub twj tso kua mis uas yuav ua rau muaj kev nyab xeeb, txhim khu kev qha, thiab ntev - kev ua tau zoo nyob rau hauv txawm tias qhov kev xav tau tshaj plaws hauv ib puag ncig caustic.
Txoj Kev Phem Phem: Kev Nyuaj Siab Corrosion Cracking (SCC)
Thawj qhov kev hem thawj thaum siv cov dej qab zib caustic tsis yog kev xeb dav dav - nws yog caustic -induced stress corrosion cracking (CSCC). Hom kev ua tsis zoo no tshwm sim thaum peb yam sib xyaw ua ke:
1. Cov khoom siv tau yooj yim (zoo li tus qauv austenitic stainless hlau).
2. Tensile stress (los ntawm lub siab sab hauv, residual vuam kev nyuaj siab, los yog mechanical loading).
3. Ib qho tseem ceeb concentration thiab kub ntawm NaOH.
Tsis zoo li cov corrosion tsis zoo, SCC ua rau tam sim ntawd, nkig tawg nrog me me kom tsis muaj kev ceeb toom, ua rau muaj kev nyab xeeb loj thiab muaj kev pheej hmoo ib puag ncig. Nkag siab txog cov txheej txheem no yog thawj kauj ruam los tiv thaiv nws.
Vim li cas Standard Stainless Hlau Fail
Ntau tus engineers xav tias stainless hlau, tshwj xeeb tshaj yog qib 316 (SS316), tsim nyog rau tag nrho cov kev pabcuam "chemical". Qhov no yog ib qho txaus ntshai misconception thaum nws los txog rau caustic soda.
* SS316 yog qhov yooj yim heev rau SCC nyob rau hauv kub, concentrated NaOH kev daws teeb meem. Qhov kev pheej hmoo nce siab tshaj 50℃(122℃F) thiab ntau dua 10-20%.
* Weld aav tshwj xeeb tshaj yog vim muaj kev ntxhov siab ntau dhau los ntawm cov txheej txheem fabrication.
Kev nkag siab tseem ceeb:Yog tias koj daim ntawv thov cuam tshuam nrog NaOH ntawm qhov kub siab lossis qhov siab, SS316 yuav tsum raug txiav tawm tam sim ntawd.
Muaj kev nyab xeeb & ntseeg tau cov ntaub ntawv pom zoo
Xaiv cov ntaub ntawv wetted txoj cai yog koj thawj qhov kev tiv thaiv tsis ua haujlwm. Nov yog qhov kev sib faib ntawm cov kev xaiv zoo tshaj plaws rau kev pabcuam caustic:
1. PTFE (Polytetrafluoroethylene / Teflon®)
* Tus Qauv Kub: Muaj nyob ze - tshuaj tiv thaiv thoob ntiaj teb, suav nrog rau txhua qhov ntau ntawm NaOH thoob plaws nws qhov kev ua haujlwm kub (-60℃txog +150℃/ -76℃F rau +302℃F).
* Qhov zoo tshaj plaws rau: Cov ntawv thov uas tsis muaj tshuaj lom neeg tsis muaj zog thiab tsis muaj paug paug yog qhov tseem ceeb. Feem ntau siv los ua ib lub hauv ob sab phlu rau cam khwb cia hlau los yog ductile hlau twj tso kua mis, muab cov qauv zoo heev nrog zoo corrosion kuj.
* Kev txiav txim siab: qis dua txhua yam zog dua li cov hlau; tsis zoo rau siab -siab los yog abrasive slurries.
2. PVDF (Polyvinylidene Fluoride / Kynar®)
* Siab-Kev Ua Haujlwm Yas: Muab qhov sib npaug zoo ntawm cov tshuaj tiv thaiv, lub zog txhua yam, thiab thermal stability. Resistant rau NaOH txog li 50% concentration ntawm qhov kub txog li 90℃(194℃F).
* Qhov Zoo Tshaj Plaws Rau: Tus nqi -kev daws teeb meem zoo rau ntau daim ntawv thov caustic, tshwj xeeb tshaj yog qhov xav tau kev ntsuas siab dua piv rau PTFE-lined twj.
* Consideration: Can be attacked by very hot, highly concentrated (>70%) NaOH. Nco ntsoov sab laj nrog cov ncauj lus kom ntxaws txog tshuaj lom neeg.
3. Nickel-Based Alloys (xws li Alloy 20, Inconel 625)
* Cov Khoom Siv Hlau Tshwj Xeeb: Cov alloys no muaj kev tiv thaiv tshwj xeeb rau SCC nyob rau hauv cov huab cua phem tshaj plaws - kub thiab siab ntau qhov uas cov yas yuav tsis haum.
* Qhov Zoo Tshaj Plaws Rau: Siab-siab, siab- daim ntawv thov kub lossis qhov chaw muaj cov kua dej uas tuaj yeem ua rau cov khoom yas.
* Kev txiav txim siab: Tus nqi pib tseem ceeb dua. Overkill rau ntau daim ntawv thov txheej txheem qhov twg PTFE lossis PVDF yuav txaus.
Tswv yim Pro:Rau siab tshaj plaws kev nyab xeeb thiab tus nqi nyob rau hauv feem ntau muaj kev lag luam chaw, PTFE-lined twj tso kua mis yog qhov zoo tshaj plaws xaiv, combining lub unbeatable tshuaj tsis kam ntawm PTFE nrog lub zog tsim ntawm ib tug hlau twj tso kua mis.
Sealing Solutions rau cov kua dej txaus ntshai
Txij li thaum caustic soda yog ob qho tib si corrosive thiab txaus ntshai, koj lub tswv yim sealing yog qhov tseem ceeb.
Magnetic Drive (Sealless) Pumps: Qhov Kev Xaiv Zoo Tshaj
* Zero Leakage: Los ntawm kev tsim, cov twj tso kua mis no tsis muaj lub foob foob, tshem tawm txoj kev xau thawj. Qhov no tsis yog - sib tham tau rau kev tiv thaiv cov neeg ua haujlwm, ib puag ncig, thiab ua tau raws li cov qauv kev cai nruj (xws li EPA lossis REACH).
* Kev tu qis: Tsis muaj cov ntsaws ruaj ruaj los saib xyuas, kho, lossis hloov.
* Qhov Zoo Tshaj Plaws Rau: Feem ntau cov kev hloov pauv, kev ncig, thiab kev siv tshuaj noj uas cuam tshuam nrog NaOH.
Ob Chav Mechanical Seals (nrog Txoj Kev Npaj 53B): Ib Txoj Haujlwm Zoo
* Thaum Yuav Tsum Tau: Hauv qee qhov siab -siab ANSI/API systems, lub twj tso kua mis sib txuas yuav raug teev tseg. Nyob rau hauv cov ntaub ntawv no, ib tug ob chav mechanical foob yog yuav tsum tau.
* Plan 53B: Qhov tshwj xeeb API 682 flush txoj kev npaj no siv lub siab, huv si barrier kua (feem ntau glycerin los yog ib tug tshwj xeeb roj) nyob rau hauv ib tug kaw - voj system ntawm ob lub ntsej muag foob. Ib qho khoom siv hluav taws xob sab nraud ua rau cov dej tsis sib haum, ua kom cov ntsaws ruaj ruaj ua haujlwm hauv qhov chaw huv, txias, cais tawm ntawm cov kub kub.
* Kev txiav txim siab: Yuav tsum muaj kev txhawb nqa ntau dua thiab kev saib xyuas tsis tu ncua ntawm cov kua dej barrier thiab siab.
Txoj Cai Golden:Rau kev txhim kho tshiab lossis cov kev pabcuam tseem ceeb, lub twj tso kua mis sib nqus tsis sib nqus yog yuav luag txhua qhov kev xaiv zoo dua, muaj kev nyab xeeb dua, thiab kev xaiv pheej yig dua rau caustic soda.
Tiag -Kev Thov Ntiaj Teb: Ua tiav hauv Kev Lag Luam Pulp & Ntawv
Kev sib tw:Lub tshuab loj loj tau ntsib ntau zaus, kev puas tsuaj loj ntawm SS316 centrifugal twj tso kua mis hauv lawv cov cawv dawb (kub, concentrated NaOH tov) cov voj voog ncig. Kev ua tsis tiav tau tshwm sim txhua 6-12 lub hlis, ua rau raug kaw thiab muaj kev txhawj xeeb txog kev nyab xeeb.
Kev daws:Cov nroj tsuag tau hloov cov twj tsis ua haujlwm nrog PTFE-lined sib nqus tsav twj tso kua mis, tshwj xeeb yog tsim los rau siab -kub caustic kev pab cuam.
Qhov tshwm sim:
* Zero twj tsis ua haujlwm cuam tshuam txog kev xeb lossis tawg rau ntau dua 5 xyoos.
* Ua kom tiav kev tshem tawm cov pa phem tawm, ua kom muaj kev ua raws li kev cai ib puag ncig.
* Kev txo qis hauv kev saib xyuas kev ua haujlwm thiab cov khoom seem, xa rov qab tag nrho ntawm kev nqis peev hauv 18 lub hlis.
Koj Cov kauj ruam tom ntej: Tau txais lub twj tso kua mis rau koj daim ntawv thov NaOH
Tsis txhob tso koj qhov kev pabcuam tseem ceeb caustic soda rau lub sijhawm. Txhawm rau kom koj xaiv lub twj tso kua mis zoo tshaj plaws thiab txhim khu kev qha, muab cov ntsiab lus hauv qab no rau peb:
1. NaOH Concentration: (piv txwv li, 50%)
2. Kev khiav hauj lwm kub: (piv txwv li, 80℃/ 176℃F)
3. Yuav tsum tau khiav tus nqi & Lub taub hau: (piv txwv li, 50 m³ / h @ 30m)
4. Puas muaj cov ntsiab lus? (Yog / Tsis yog, thiab kwv yees li % yog tias yog)
Peb pab neeg ua haujlwm engineering yuav txheeb xyuas koj cov kev xav tau tshwj xeeb thiab muab kev pom zoo pub dawb, kws tshaj lij rau kev teeb tsa lub twj tso kua mis zoo meej.
Tau txais koj daim ntawv pom zoo Caustic Soda Pump Dawb
Hais txog XJY-PUMP
XJY-PUMP yog lub thoob ntiaj teb cov twj tso kua mis tso siab rau kev txhim kho corrosion- cov twj siv tshuaj tiv thaiv, nrog ntau xyoo dhau los ntawm kev daws cov teeb meem nyuaj tshaj plaws hauv kev lag luam tshuaj lom neeg, pulp & ntawv, thiab dej kho kev lag luam. Peb tshwj xeeb hauv PTFE-lined thiab qib siab hlau twj tso kua mis tsim los rau cov kev pabcuam nruj tshaj plaws, suav nrog cov dej qab zib caustic.
https://www.xjy-pump.com/