Posankha mapampu amadzi, ngati kusankhidwa kuli kosayenera, mtengo ukhoza kukhala wapamwamba kapena ntchito yeniyeni ya mpope sikungakwaniritse zosowa za malo. Tsopano perekani chitsanzo chosonyeza mfundo zina zimene mpope wa madzi ayenera kutsatira.
Kusankhidwa kwa pampu yoyamwa kawiri kuyenera kulabadira mfundo izi:
1. Liwiro:
Kuthamanga kwanthawi zonse kumatsimikiziridwa malinga ndi zomwe kasitomala akufuna. Kutsika kwa liwiro la mpope womwewo, kuthamanga kofanana ndi kukweza kudzachepa. Posankha chitsanzo, m'pofunika kuganizira osati ntchito zachuma, komanso malo malo, monga: mamasukidwe akayendedwe a sing'anga, kuvala kukana, kudzidalira priming, zinthu kugwedera, etc.
2. Kutsimikiza kwa NPSH:
NPSH imatha kutsimikiziridwa molingana ndi mtengo woperekedwa ndi kasitomala, kapena malinga ndi momwe mpope amalowera, kutentha kwapakatikati komanso kuthamanga kwamlengalenga:
Kuwerengera kwa kutalika kwa mpope wamadzi (chiwerengero chosavuta: molingana ndi kuthamanga kwamlengalenga ndi madzi otentha) motere:
Pakati pawo: hg - kutalika kwa kuyika kwa geometric (mtengo wabwino ndikuyamwa mmwamba, mtengo woipa ndikuyenda mobwerera);
-Atmospheric pressure madzi mutu pamalo oikapo (owerengedwa ngati 10.33m pansi pa kuthamanga kwamlengalenga ndi madzi oyera);
hc - kuyamwa hydraulic kutaya; (ngati payipi yolowera ndi yaifupi komanso yosavuta, nthawi zambiri imawerengedwa ngati 0.5m)
- vaporization kuthamanga mutu; (madzi oyera kutentha kutentha amawerengedwa ngati 0.24m)
- NPSH yovomerezeka; (kuonetsetsa chitetezo, kuwerengera molingana ndi NPSHr×1.2, NPSHr onani kabukhu)
Mwachitsanzo, NPSH NPSHr = 4m: Kenako: hg = 10.33-0.5-0.24- (4 × 1.2) = 4.79 m (zotsatira zokhazikika ndi mtengo wabwino, zikutanthauza kuti zimatha kuyamwa mpaka ≤4.79m, ndiye , mlingo wolowetsa madzi ukhoza kukhala mu choyikapo mkati mwa 4.79m pansi pa mzere wapakati; kutsanulira mmbuyo, ndipo mtengo wakuthira kumbuyo uyenera kukhala wochuluka kuposa mtengo wowerengeka, ndiye kuti, mlingo wa madzi olowera ukhoza kukhala pamwamba pa mtengo wowerengeka pamwamba pa mzere wapakati wa choyikapo).
Zomwe zili pamwambazi zimawerengedwa pansi pa kutentha kwabwino, madzi abwino komanso okwera bwino. Ngati kutentha, kachulukidwe ndi kutalika kwa sing'anga ndizosazolowereka, pofuna kupewa cavitation ndi mavuto ena omwe amakhudza ntchito yachibadwa ya pampu, zikhalidwe zofananira ziyenera kusankhidwa ndikulowa m'malo mwa njira yowerengera. Pakati pawo, kutentha ndi kachulukidwe ka sing'anga zimawerengedwa molingana ndi zikhalidwe zofanana mu "Vaporization Pressure and Density of Water at Different Temperatures", ndipo kutalika kwake kumawerengedwa molingana ndi zikhalidwe zofananira mu "Altitude and Atmospheric Pressure of Major Cities in. Dziko". NPSH ina yovomerezeka ndikuonetsetsa chitetezo, malinga ndi NPSHr × 1.4 (mtengo uwu ndi osachepera 1.4).
3. Pamene kulowetsedwa kwa mpope wamba ndi ≤0.2MPa, pamene kulowetsedwa kwa mpweya + mutu × 1.5 nthawi ≤ kupanikizika, sankhani molingana ndi zinthu zomwe zimagwiritsidwa ntchito;
Kupanikizika kolowera + mutu × 1.5 nthawi > kuponderezana, zida zoyenera zomwe zimakwaniritsa zofunikira ziyenera kugwiritsidwa ntchito; ngati kulowetsedwa kolowera kuli kwakukulu kwambiri kapena kupanikizika kwa mayesero ndikwambiri, ndi zina zotero zomwe sizikukwaniritsa zofunikira, chonde tsimikizirani ndi teknoloji kuti musinthe zinthu kapena kukonza nkhungu ndikuwonjezera makulidwe a khoma;
4.Conventional mpope makina osindikizira zitsanzo ndi: M7N, M74 ndi M37G-G92 mndandanda, amene munthu ntchito zimadalira pa mpope kapangidwe, ochiritsira makina chisindikizo zinthu: zolimba / zofewa (tungsten carbide / graphite); pamene kulowetsedwa kolowera ndi ≥0.8MPa, Chisindikizo choyenera chiyenera kusankhidwa;
5. Ndikoyenera kuti kutentha kwapakati pa mpope woyamwa kawiri kuyenera kupitirira 120 ° C. Pamene 100 ° C ≤ sing'anga kutentha ≤ 120 ° C, mpope ochiritsira ayenera kukonzedwa: patsekeke kusindikiza ndi gawo lonyamula ayenera zida ndi madzi ozizira kunja kwa patsekeke yozizira; O-mphete zonse za mpope amapangidwa Onse ntchito: fluorine rabara (kuphatikizapo makina chisindikizo).
Nthawi yotumiza: May-10-2023