1. Muchidimbu Chiitiko chacho

A 25 MW unit's circulating cooling system inoshandisa maviri  kupatsanura casing pombi. Pombi yega yega nameplate data:

Kuyerera (Q): 3,240 m³/h

Musoro wekugadzira (H): 32 m

Kumhanya (n): 960 rpm

Simba (Pa): 317.5 kW

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

Mukati memwedzi miviri chete, imwe pombi impeller yakaputika nekuda kwekukukurwa kwecavitation.

2. Munda Kuongorora & Diagnostics

Kudzvanywa kwekuverenga pane discharge geji: ~ 0.1 MPa (zvichienderana nezvinotarisirwa ~ 0.3 MPa yemusoro we32 m)

Zviratidzo zvinoonekwa: mhirizhonga yetsono kuchinja uye cavitation "popping" inonzwika

Ongororo: Pombi yaishanda kure kurudyi rweBest Efficiency Point (BEP), ichiendesa ~10 m musoro chete pane 32 m.

3. Pa-site Testing & Root Cause Confirmation

Vashandisi vakatsikitsira zvishoma nezvishoma pombi yekuburitsa valve:

Discharge pressure yakawedzera kubva 0.1 MPa kusvika 0.28 MPa.

Cavitation ruzha rwakapera.

Condenser vacuum yakavandudzwa (650 → 700 mmHg).

Musiyano wetembiricha pane condenser wakadzikira kubva ~33 °C kusvika <11 °C, zvichisimbisa kudzoreredzwa kwekuyerera.

Mhedziso: Cavitation yakakonzerwa nekushanda kwakadzika-pasi / kuderera-kuyerera, kwete nemhepo inoputika kana kukanganisa kwemagetsi.

4. Sei Kuvhara Valve Kunoshanda

Kudzvanya kuburitsa kunowedzera kupikisa kwese system, kushandura pombi yekushanda yakasara yakananga kuBEP yayo-kudzoreredza musoro wakakwana uye kuyerera. Zvisinei:

Vhuru inofanira kuramba ichingova ~ 10% yakavhurika-inoisa kupfeka uye kusashanda.

Kumhanya nguva dzose pasi pemamiriro ezvinhu akatsikirirwa hakuna mari uye kunogona kukonzera kukuvara kwevharuvhu.

5. Management Strategy & Solution

Tichifunga iyo yepakutanga pombi specs (32 m musoro) uye chaiyo kudiwa (~ 12 m), kugadzira iyo impeller kwaisashanda. Mhinduro inokurudzirwa:

Deredza kumhanya kwemota: kubva 960 rpm → 740 rpm.

Gadzirisazve impeller geometry kuitira kuita kwakaringana pakumhanya kwakaderera.

Mhedzisiro: Cavitation yakabviswa uye kushandiswa kwesimba zvakanyanya kuderedzwa-kusimbiswa mukutevera kuongororwa.

6. Zvidzidzo Zvakawanikwa

Saizi nguva dzose split casing pombi padyo neBEP yavo kudzivirira kukuvara kwecavitation

Monitor NPSH—NPSHa inofanira kudarika NPSHr; throttle control ibhendi-rubatsiro, kwete kugadzirisa

Mishonga mikuru:

Gadzirisa saizi ye impeller kana kutenderera kumhanya (semuenzaniso, VFD, bhandi dhiraivha),

Re-pipe system yekuwedzera discharge musoro,

Ita shuwa kuti mavharuvhu akakurisa nemazvo uye dzivirira kumhanya pombi dzakatsikirirwa zvachose

Shandisa maitiro ekutarisa kuti uone yakaderera-musoro, yakaderera-kuyerera kushanda nekukurumidza.

7. Mhedziso

Mhosva iyi inosimbisa kukosha kwekugadzirisa pombi kushanda nemaitiro ayo ekugadzira. Pombi yakapatsanurwa inomanikidzwa kushanda kure neBEP yayo ichaita cavitate-kunyangwe mavharuvhu kana zvisimbiso zvichiratidzika zvakanaka. Kugadzirisa senge kumhanyisa kudzikisa uye impeller redesign haingorapi cavitation chete asi inovandudza kugona kwesimba rose.