Seawater Pretreatment: Validating Ceramic Pump Reliability Rau Siab -Salinity, Sand-Laden Seawater Transfer

Nyob rau hauv txhua qhov dej hiav txwv desalination system, qhov nkag tau yog feem ntau xav tau ntau dua li cov neeg feem coob paub-tshwj xeeb tshaj yog rau kev qhib dej hiav txwv. Cov dej tsis yog tsuas yog ntsev electrolyte; Nws yog cov khoom sib xyaw ua kua uas nqa cov khoom tshem tawm, cov kab mob, thiab cov grit zoo. Pretreatment yuav tsum ua kom pom thiab daws teeb meem, tab sis ua ntej dej txawm mus txog cov theem no, koj yuav tsum nqa nws los ntawm hiav txwv thiab txav mus rau lub tsheb ciav hlau kho. Cov kauj ruam yooj yooj yim no xaus mus ua ib lub fwj tseem ceeb rau kev cia siab rau cov nroj tsuag mus ntev.

Tias yog vim li cas ntau tus engineers tig mus rau cov twj nrog ceramic wetted qhov chaw. Tab sis ua pov thawj lawv tau tuav hauv kev pabcuam tiag tiag yuav siv sijhawm ntau dua li tsuas yog saib cov ntaub ntawv cov ntaub ntawv. Koj yuav tsum rhuav nws mus rau hauv peb qhov kev ua tau zoo.

Ua ntej, cov kua dej hloov ceev cuam tshuam li cas rau hydraulic cwj pwm?
Thaum cov xuab zeb cov ntsiab lus hloov pauv, qhov ceev thiab viscosity ntawm seawater hloov. Feem ntau cov twj tso kua mis nkhaus yog raws li cov dej ntshiab, yog li dhia ceev ceev hauv cov xuab zeb concentration-hais los ntawm 0.5% mus rau 3%- tuaj yeem thawb lub taub hau tiag tiag thiab ntws tawm ntawm lawv cov qauv tsim. Ceramic twj tso kua mis impellers muaj qhov chaw du heev, uas pab ua kom cov hydraulic poob kuj tsis hnov ​​​​tsw rau viscosity hloov. Tseem, lo lus nug tiag tiag tsis yog hais txog qhov ceev tshaj plaws; nws yog seb lub taub hau nkhaus poob qis los yog pib oscillating thaum cov xuab zeb hloov pauv. Cov kev ntsuam xyuas qhia tau hais tias nrog ib tug ua tib zoo xaiv impeller trim, ntws variation nyob twj ywm nyob rau hauv ± 5% ntawm tsim taw tes nyob rau hauv cov xuab zeb-cov ntsiab lus ntau yam. Qhov kev ruaj ntseg ncaj qha txhais mus rau ntau qhov sib npaug ntawm lub siab rau cov dej ntws rov qab-osmosis membranes.

Qhov thib ob, ua li cas txog kev yaig mus ntev los ntawm kev cuam tshuam grit?
Cov quartz particles txav ntawm qhov siab tshaj qhov tseem ceeb sandblast lub casing thiab impeller npoo. Cov khoom siv hlau zoo li tsim pitting lossis grooved hnav qauv thaum lub sijhawm. Cov ntaub ntawv ceramic zoo li alumina lossis silicon carbide, nrog Vickers hardness saum 1200 HV, hloov cov txheej txheem hnav los ntawm kev txiav / shearing rau elastic cuam tshuam. Hauv kev sim ua lub neej nrawm nrog cov xuab zeb concentration ob npaug saum toj no tsim, tom qab 2,000 teev ntawm kev ua haujlwm tas mus li, ceramic impeller's inlet ntug poob tsuas yog li 0.08 hli ntawm cov khoom. Qhov ntawd yog qeeb, kwv yees hnav tus nqi. Nws txhais tau hais tias cov neeg ua haujlwm tuaj yeem teem sijhawm saib xyuas raws li cov ntaub ntawv keeb kwm turbidity, es tsis yog tos rau qhov tsis ua haujlwm tam sim ntawd lossis muaj kev puas tsuaj loj loj.

Qhov thib peb, qhov kev tshem tawm degradation cuam tshuam li cas rau kev ua haujlwm ntawm volumetric?
Qhov hnav lub nplhaib tshem tawm hauv lub twj tso kua mis yog txoj hauv kev tseem ceeb rau kev rov ua haujlwm sab hauv. Nrog cov twj hlau hlau, raws li qhov kev tshem tawm loj hlob los ntawm kev puas tsuaj, qhov kev ua haujlwm ntawm qhov ntim tau poob tawm exponentially - nkim ntau thiab ntau zog. Ceramics muaj qis dua thermal expansion coefficient, yog li thaum dej hiav txwv kub nce los ntawm 15℃mus rau 40 degree, qhov clearance nce tsuas yog ib feem peb ntawm qhov koj xav pom hauv lub twj tso kua mis hlau. Nyob rau hauv validation khiav, raws li qhov clearance maj mam qhib los ntawm 0.30 mm mus rau 0.45 mm nyob rau hauv lub sij hawm, lub efficiency poob nyob rau hauv linear thiab maj mam - tsis muaj tam sim ntawd inflection point. Qhov kev kwv yees no txuag cov neeg ua haujlwm tsis tu ncua nrog kev hloov kho axial rotor, uas tseem txo cov kev pheej hmoo ntawm kev sib dhos ua yuam kev los ntawm kev cuam tshuam ntau zaus.

Ib yam uas koj tsis tuaj yeem tsis quav ntsej yog qhov brittleness ntawm ceramics. Kev ntsuas kev ntseeg siab yuav tsum muaj xws li thermal-shock resistance. Cov twj tso kua mis pib, nres, thiab pom cov dej ntws tam sim ntawd uas tsim kom muaj qhov kub thiab txias nyob rau hauv lub casing. Hauv kev sim cyclic- hloov pauv ntawm 15℃dej hiav txwv txias thiab luv luv 45℃excursions-tsis muaj micro-cracks tshwm. Tsuav tus qauv tsim vaj tsev tawm hauv chav nthuav dav txaus, cov twj ceramic tuaj yeem tswj tau qhov kev hloov pauv ib txwm tsis muaj teeb meem.

Kev tawm tswv yim tawm tswv yim qhia tias kev siv cov twj ceramic hauv kev kho ua ntej tsis yog hais txog kev ua tiav "zero wear." Nws yog hais txog kev hnav khaub ncaws kom tswj tau. Es tsis txhob sib ntaus sib tua unpredictable corrosion thiab yaig, koj tau txais ib tug qeeb, ntsuas qhov ntev hloov. Cov neeg ua haujlwm tuaj yeem ntsuas lub twj tso kua mis sab hauv tsuas yog taug qab qhov sib txawv ntawm qhov sib txawv thiab lub cev muaj zog tam sim no kos- tsis muaj kev kwv yees. Qhov tseeb ntawm qhov no yog qhov uas ploj lawm hauv ntau cov ntsev, xuab zeb-laden siv cov ntawv thov. Thaum lub tshuab nqa nqa tsis ua haujlwm, RO daim nyias nyias tau txais kev ruaj khov, tsis muaj kev cuam tshuam. Qhov ntawd yog qhov kev sim tiag tiag ntawm engineering- zoo npaum li cas cov tshuab tshuab thiab cov ntaub ntawv tshawb fawb tuaj ua ke hauv thaj chaw.