1. Mwachidule za Chochitikacho

Makina ozizirira ozungulira a 25 MW amagwiritsa ntchito ziwiri  mapampu apakati apakati. Chidziwitso cha pampu iliyonse:

Kuyenda (Q): 3,240 m³/h

Kupanga mutu (H): 32 m

Liwiro (n): 960 rpm

Mphamvu (Pa): 317.5 kW

NPSH yofunikira (Hs): 2.9 m (≈ 7.4 m NPSHr)

M'miyezi iwiri yokha, chopopera chimodzi chapope chinaphulika chifukwa cha kukokoloka kwa cavitation.

2. Kufufuza kwa Munda & Kufufuza

Kuwerenga kwamakanikizidwe pamagetsi otulutsa: ~ 0.1 MPa (kuyerekeza ~ 0.3 MPa pamutu wa 32 m)

Zizindikiro zomwe zimawonedwa: kusinthasintha kwa singano zachiwawa ndi kumveka kwa "popping" kwa cavitation

Kuwunika: Pampuyo inali ikugwira ntchito kutali kumanja kwa Best Efficiency Point (BEP), ikungopereka mutu wa ~ 10m wokha osati 32 m.

3. Kuyesa Pamalo & Chitsimikizo Choyambitsa Mizu

Ogwira ntchito anagwedeza pang'onopang'ono valve yotulutsa pampu:

Kuthamanga kwa magazi kunakwera kuchokera ku 0.1 MPa kufika ku 0.28 MPa.

Phokoso la cavitation linatha.

Mpweya wa condenser wapita patsogolo (650 → 700 mmHg).

Kusiyana kwa kutentha pa condenser kwatsika kuchoka pa ~ 33 °C kufika pa <11 °C, kutsimikizira kubwezeretsedwa kwa kayendedwe kake.

Kutsiliza: Cavitation idayambitsidwa ndi ntchito yokhazikika yotsika / yotsika, osati ndi kutulutsa mpweya kapena kulephera kwamakina.

4. Chifukwa Chake Kutseka Vavu Kumagwira Ntchito

Kupondereza kutulutsa kumawonjezera kukana kwa dongosolo lonse, kusuntha malo ogwirira ntchito a mpope kupita ku BEP yake-kubwezeretsa mutu wokwanira ndi kuyenda. Komabe:

Vavu iyenera kukhala yotseguka ~ 10% yokha-yowoneka bwino komanso yosagwira ntchito.

Kuthamanga mosalekeza pansi pazimenezi ndizopanda ndalama ndipo kungayambitse kuwonongeka kwa valve.

5. Management Strategy & Solution

Poganizira zoyambira zapampu (mutu wa 32m) ndi kufunikira kwenikweni (~12 m), kudula chopondera sikunali kotheka. Yankho lovomerezeka:

Chepetsani liwiro lagalimoto: kuchokera 960 rpm → 740 rpm.

Konzaninso impeller geometry kuti mugwire bwino ntchito pa liwiro lotsika.

Zotsatira: Cavitation inathetsedwa ndi kugwiritsa ntchito mphamvu kuchepetsedwa kwambiri-kutsimikiziridwa pakuyesedwa kotsatira.

6. Zimene Tikuphunzirapo

Kukula nthawi zonse kagawo kakang'ono mapampu pafupi ndi BEP yawo kuti apewe kuwonongeka kwa cavitation

Monitor NPSH—NPSHa iyenera kupitilira NPSHr; throttle control ndi band-aid, osati kukonza

Thandizo lalikulu:

Sinthani kukula kwa chowongolera kapena liwiro lozungulira (mwachitsanzo, VFD, kuyendetsa lamba),

Re-pipe system kuti muwonjezere kutulutsa mutu,

Onetsetsani kuti mavavu akukulitsidwa moyenera ndipo pewani kuthamangitsa mapampu mpaka kalekale

Limbikitsani kuwunika kwa magwiridwe antchito kuti muzindikire kutsika kwamutu, koyenda kocheperako koyambirira.

7. Kutsiliza

Mlanduwu ukuwonetsa kufunikira kogwirizanitsa ntchito ya pampu ndi mapangidwe ake. Pampu yopatsirana yomwe imakakamizidwa kuti igwire ntchito kutali ndi BEP yake idzagwedezeka-ngakhale mavavu kapena zosindikizira zikuwoneka bwino. Zowongolera monga kuchepetsa liwiro ndi kukonzanso kwa impeller sikungochiritsa cavitation komanso kumapangitsa kuti mphamvu zonse ziziyenda bwino.