Hauv kev xaiv cov twj tso kua dej, yog tias kev xaiv tsis raug, tus nqi yuav siab lossis qhov ua tau zoo ntawm lub twj tso kua mis yuav tsis ua raws li qhov xav tau ntawm qhov chaw. Tam sim no muab ib qho piv txwv los piav txog qee cov ntsiab cai uas lub twj tso kua dej yuav tsum ua raws.
Kev xaiv ntawm ob chav nqus twj tso kua mis yuav tsum tau xyuam xim rau cov ntsiab lus hauv qab no:
1. Ceev:
Qhov ib txwm ceev yog txiav txim siab raws li tus neeg siv khoom xav tau. Qhov qis dua qhov ceev ntawm tib lub twj tso kua mis, tus nqi sib thooj thiab nqa yuav txo. Thaum xaiv cov qauv, nws yog ib qho tsim nyog yuav tsum xav txog tsis yog tsuas yog kev lag luam kev lag luam, tab sis kuj yog qhov chaw nyob, xws li: lub viscosity ntawm qhov nruab nrab, hnav tsis kam, kev muaj peev xwm ntawm tus kheej, kev co, thiab lwm yam.
2. Kev txiav txim siab ntawm NPSH:
NPSH tuaj yeem txiav txim siab raws li tus nqi muab los ntawm tus neeg siv khoom, lossis raws li cov khoom siv nkag ntawm lub twj tso kua mis, qhov nruab nrab qhov kub thiab txias ntawm qhov chaw atmospheric siab:
Kev suav ntawm qhov siab ntawm lub twj tso kua mis dej (yooj yim algorithm: raws li tus qauv atmospheric siab thiab dej kub ib txwm) yog raws li nram no:
Ntawm lawv: hg-geometric installation qhov siab (tus nqi zoo yog nqus, tus nqi tsis zoo yog thim rov qab);
-Atmospheric siab dej taub hau ntawm qhov chaw teeb tsa (xws li 10.33m raws li tus qauv atmospheric siab thiab dej ntshiab);
hc - nqus hydraulic poob; (yog tias cov kav dej nkag yog luv thiab tsis yooj yim, nws feem ntau suav tias yog 0.5m)
- Vaporization siab lub taub hau; (cov dej ntshiab ntawm chav tsev yog xam raws li 0.24m)
- Tso cai NPSH; (kom muaj kev nyab xeeb, xam raws li NPSHr × 1.2, NPSHr saib catalog)
Piv txwv li, NPSH NPSHr = 4m: Tom qab ntawd: hg = 10.33-0.5-0.24-(4 × 1.2) = 4.79 m (qhov tshwm sim yog qhov txiaj ntsig zoo, nws txhais tau tias nws tuaj yeem nqus mus txog ≤4.79m, uas yog , cov dej nkag tuaj yeem nyob rau hauv lub impeller Tsis pub dhau 4.79m hauv qab kab hauv nruab nrab yog tias nws nyob hauv qhov tsis zoo, nws yuav tsum tau nchuav rov qab, thiab tus nqi rov qab nchuav yuav tsum ntau dua li cov nqi suav, uas yog, cov dej ntws tawm. inlet theem tuaj yeem siab tshaj tus nqi suav saum toj ntawm kab nruab nrab ntawm lub impeller).
Cov saum toj no yog xam raws li qhov kub thiab txias, dej ntshiab thiab qhov siab li qub. Yog tias qhov kub thiab txias, qhov siab thiab qhov siab ntawm qhov nruab nrab yog qhov txawv txav, txhawm rau kom tsis txhob muaj cavitation thiab lwm yam teeb meem cuam tshuam rau kev ua haujlwm ntawm lub twj tso kua mis, cov txiaj ntsig zoo sib xws yuav tsum raug xaiv thiab hloov pauv rau hauv cov qauv rau kev suav. Ntawm lawv, qhov ntsuas kub thiab qhov ceev ntawm qhov nruab nrab yog xam raws li cov txiaj ntsig sib xws hauv "Vaporization Pressure thiab Density of Water at Different Temperatures", thiab qhov siab yog xam raws li tus nqi sib thooj hauv "Altitude and Atmospheric Pressure of Major Cities in lub teb chaws". Lwm qhov kev tso cai NPSH yog kom muaj kev nyab xeeb, raws li NPSHr × 1.4 (tus nqi no tsawg kawg yog 1.4).
3. Thaum lub inlet siab ntawm cov pa twj tso kua mis yog ≤0.2MPa, thaum lub inlet siab + lub taub hau × 1.5 zaug ≤ lub siab siab, xaiv raws li cov khoom pa;
Inlet siab + lub taub hau × 1.5 zaug> kev tawm tsam siab, cov khoom siv raws li qhov yuav tsum tau siv; Yog hais tias qhov inlet siab siab dhau lawm los yog qhov kev ntsuam xyuas siab dhau lawm, thiab lwm yam uas tsis ua raws li qhov yuav tsum tau ua, thov paub meej nrog cov cuab yeej siv los hloov cov khoom siv lossis kho cov pwm thiab ua kom cov phab ntsa tuab;
4.Conventional twj tso kua mis mechanical seal qauv yog: M7N, M74 thiab M37G-G92 series, uas ib tug yuav siv nyob rau ntawm lub twj tso kua mis tsim, pa txhua yam khoom foob: tawv / mos (tungsten carbide / graphite); Thaum lub inlet siab yog ≥0.8MPa, yuav tsum tau xaiv ib tug sib npaug mechanical foob;
5. Nws raug pom zoo tias qhov nruab nrab kub ntawm ob lub tshuab nqus tsev twj tso kua mis yuav tsum tsis txhob siab tshaj 120 ° C. Thaum 100 ° C ≤ nruab nrab kub ≤ 120 ° C, lub twj tso kua mis yuav tsum tau kho: lub sealing kab noj hniav thiab cov kabmob yuav tsum tau nruab nrog cov dej txias sab nraum lub qhov cua txias; Tag nrho O-rings ntawm lub twj tso kua mis yog tsim los ntawm Ob leeg siv: fluorine roj hmab (nrog rau lub tshuab foob).
Post lub sij hawm: May-10-2023