1. Bayanin Lamarin

Na'ura mai karfin 25MW ta tsarin sanyaya mai kewayawa tana amfani da biyu  raba casing famfo. Bayanin farantin suna kowane famfo:

Guda (Q): 3,240m³/h

Shugaban ƙira (H): 32m

Saurin (n): 960rpm

Power (Pa): 317.5 kW

NPSH da ake buƙata (Hs): 2.9m (≈ 7.4m NPSHr)

A cikin watanni biyu kacal, injin famfo guda ɗaya ya lalace saboda yashwar cavitation.

2. Binciken Filin & Bincike

Matsa lamba akan ma'aunin fitarwa: ~ 0.1 MPa (a kan tsammanin ~ 0.3 MPa don shugaban 32 m)

Alamun da aka lura: rikice-rikicen allura na tashin hankali da sautin "popping" cavitation

Nazari: Famfu yana aiki da nisa zuwa dama na Mafi kyawun Matsayinsa (BEP), yana ba da kai ~ 10 kawai fiye da 32 m.

3. Gwajin Kan-site & Tabbatar da Tushen

Masu aiki a hankali sun murƙushe bawul ɗin fitar da famfo:

Matsin fitarwa ya ƙaru daga 0.1 MPa zuwa 0.28 MPa.

An daina hayaniyar cavitation.

An inganta injin injin na'urar (650 → 700 mmHg).

Bambancin yanayin zafi a cikin na'ura mai ba da hanya tsakanin hanyoyin sadarwa ya ragu daga ~ 33 ° C zuwa <11 ° C, yana mai tabbatar da maido da yawan kwarara.

Kammalawa: Cavitation ya faru ne ta hanyar daidaitaccen aikin ƙananan kai / ƙananan gudu, ba ta hanyar iska ko gazawar injiniya ba.

4. Me yasa Rufe Ayyukan Valve

Tsayar da fitarwa yana ƙara juriya ga tsarin gabaɗaya, yana canza wurin aikin famfo zuwa BEP ɗin sa- yana maido da isasshen kai da kwarara. Duk da haka:

Valve dole ne ya kasance a buɗe ~ 10% kawai - yana haifar da lalacewa da rashin aiki.

Gudun ci gaba da gudana a ƙarƙashin waɗannan yanayi masu maƙarƙashiya rashin tattalin arziki ne kuma yana iya haifar da lalacewar bawul.

5. Dabarun Gudanarwa & Magani

Ganin ainihin ƙayyadaddun famfo (kai 32m) da ainihin buƙatu (~ 12m), datsa injin ɗin bai yuwu ba. Maganin shawarar:

Rage saurin motar: daga 960rpm → 740rpm.

Sake tsara lissafi na impeller don ingantaccen aiki a ƙananan sauri.

Sakamako: An kawar da cavitation kuma amfani da makamashi ya ragu sosai - an tabbatar da shi a gwaji na gaba.

6. Darussan Da Aka Koya

Koyaushe girman raba casing famfo kusa da BEP ɗin su don guje wa lalacewar cavitation

Saka idanu NPSH-NPSHa dole ne ya wuce NPSHr; sarrafa magudanar ruwa shine bandeji, ba gyara ba

Manyan magunguna:

Daidaita girman impeller ko saurin juyi (misali, VFD, bel ɗin bel),

Tsarin sake bututu don haɓaka kai mai fitarwa,

Tabbatar cewa bawul ɗin suna da girman daidai kuma a guje wa maƙarƙashiya na dindindin

Aiwatar da saka idanu don gano ƙananan kai, aiki mara ƙarfi da wuri.

7. Kammalawa

Wannan yanayin yana nuna wajibcin daidaita aikin famfo tare da ƙayyadaddun ƙirar sa. Rarraba famfo famfo da aka tilasta yin aiki daga nesa da BEP ɗinsa zai yi rauni-ko da bawuloli ko hatimi sun bayyana lafiya. Gyara kamar rage saurin gudu da sake fasalin impeller ba wai kawai warkar da cavitation bane amma inganta ingantaccen makamashi gabaɗaya.