Mokhoa oa ho Bala Bokgoni ba Turbine Sistemeng ea Setsi sa Matla a Metsi
Meralo ea Matla a Motlakase (PLTA) e sebelisa matla a ka bang teng a metsi bophahamong bo fapaneng (lihlooho) ho a fetola matla a mechini ka har'a turbine, ebe e ba matla a motlakase ka jenereithara. E 'ngoe ea matšoao a bohlokoa ka ho fetisisa a ts'ebetso setsing sa matla a motlakase oa metsi ke katleho ea turbine, kaha paramethara ena e bontša hore na turbine e fetola matla a hydraulic a metsi joang hore e be matla a shaft (mechanical). Ha katleho e le holimo, matla a mangata a ka hlahisoa ho tsoa ho phallo le hlooho e tšoanang—e leng se qetellang se e-na le tšusumetso e tobileng litšenyehelong tsa ts'ebetso, ntlafatso ea mojaro le liqeto tsa tlhokomelo.
Sengoloa sena se tšohla moelelo oa katleho ea turbine, mekhoa e sebelisitsoeng, data e hlokang ho lekanngoa, mehato ea lipalo, le mehlala e bonolo e le hore u ka bala katleho ea turbine tsamaisong ea motlakase oa metsi ka nepo.
-
1. Ho utloisisa Khopolo ea Bokgoni ba Turbine
Ka kakaretso, bokgoni ke karolelano ya "tlhahiso e thusang" ho "tlhahiso". Diturbineng tsa motlakase wa metsi:
– Ho kenya: matla a metsi a hydraulic (matla a metsi a fumaneha ka lebaka la hlooho le ho ntša metsi).
– Sehlahiswa: matla a mechini hodima shaft ya turbine (matla a shaft).
Kahoo, bokgoni ba turbine (η_t) bo hlaloswa jwalo ka:
\[
\eta_t = \frac{P_{mechanical}}{P_{hydraulic}} \times 100\%
\]
Boleng ba ts'ebetso ea turbine hangata bo tloha ho 80–95%, ho latela mofuta oa turbine (Francis, Kaplan, Pelton), maemo a ts'ebetso, le boleng ba moralo le tlhokomelo. Ha e le hantle, ts'ebetso ea turbine ha se boleng bo tsitsitseng; e fapana ho latela mojaro, sekhahla sa phallo le hlooho.
-
2. Ho Bala Matla a Hydraulic a Metsi (Tlhahiso ea Turbine)
Matla a haeteroliki ke matla ka yuniti nako eo metsi a "nkang" ho fetola turbine. Foromo e tloaelehileng ke:
\[
P_{hydraulic} = \rho \cdot g \cdot Q \cdot H
\]
Lintlha:
– \( \rho \) = bongata ba metsi (kg/m³), ka kakaretso ~1000 kg/m³
– \( g \) = ho potlaka ka lebaka la matla a khoheli (m/s²), ~9,81 m/s²
– \( Q \) = ho ntšoa ha metsi (m³/s)
– \( H \) = hlooho e hloekileng (m)
Ntlha ea bohlokoa: Sebelisa hlooho ea letlooa, eseng hlooho e akaretsang. Hlooho ea letlooa ke hlooho e setseng ka mor'a ho tlosa tahlehelo e kang khohlano ka har'a penstock, tahlehelo ea li-valve, likobe tsa liphaephe, li-racks tsa lithōle, jj.
Haeba o na le hlooho e se nang kelello feela, ka khopolo-taba:
\[
H_{net} = H_{gross} – h_f
\]
moo \( h_f \) e leng tahlehelo e felletseng ea matla (m).
-
3. Ho Fumana Matla a Mechanical a Turbine (Tlhahiso ea Turbine)
Matla a mechini a shaft ea turbine a ka baloa haeba u na le data ea torque le lebelo la ho potoloha:
\[
P_{mechanics} = T \cdot \omega
\]
kapa
\[
P_{mechanical} = \frac{2\pi n T}{60}
\]
Lintlha:
– \( T \) = torque (N·m)
– \( \omega \) = lebelo la angular (rad/s)
– \( n \) = potoloho (rpm)
Leha ho le jwalo, dibakeng tse ngata tsa motlakase wa metsi, ditekanyo tsa torque tse tobileng ha di fumanehe kamehla. Ka tsela e nngwe, o ka hakanya matla a mechini ho tswa ho tlhahiso ya motlakase ya jenereithara ka ho lokisa bokgoni ba jenereithara le sistimi ya phetiso ya mechini:
\[
P_{mechanical} \approx \frac{P_{electrical}}{\eta_{generator} \cdot \eta_{coupling}}
\]
Haeba ho kopanya ho otlolohile mme tahlehelo ya mechini e le nyane, ka dinako tse ding ho lekane:
\[
P_{mechanical} \hoo e ka bang \frac{P_{electrical}}{\eta_{generator}}
\]
-
4. Foromo e Sebedisetswang Haholo ka ho Sebetsa ka Katleho ya Turbine
Hang ha \(P_{hydraulic}\) le \(P_{mechanical}\) di tsejwa, bokgoni ba turbine ke:
\[
\eta_t = \frac{P_{mechanical}}{\rho \cdot g \cdot Q \cdot H} \times 100\%
\]
Haeba o sebedisa matla a motlakase a lekantsweng (tlhahiso ya jenereithara), seo ha e le hantle se balwang ke bokgoni bohle ba yuniti (turbine + jenereithara), ntle le haeba o e arola ho data ya bokgoni ba jenereithara:
– Bokgoni bohle ba yuniti:
\[
\eta_{total} = \frac{P_{electricity}}{\rho g QH} \times 100\%
\]
– Bokgoni ba turbine (haeba bokgoni ba jenereithara bo tsebahala):
\[
\eta_t = \frac{\eta_{total}}{\eta_{generator}}
\]
-
5. Lintlha tsa Tšimo tse Hlokang ho Lekanngoa
E le hore liphetho tsa lipalo li nepahale, lintlha tse latelang li lokela ho fumaneha:
1. Ho ntšoa ha metsi (Q)
E ka lekanngoa ka sesupa-tsela sa phallo, sesupa-tsela sa phallo sa ultrasonic, kapa mokhoa oa ho lekanya ho ntša metsi ka har'a kanale (ho latela moralo oa setsi sa motlakase sa metsi).
2. Hlooho ea letlooa (H)
E fumanoa phapang ea khatello/boemo ka ho ela hloko tahlehelo. Litekanyo li ka etsoa ka ho sebelisa sesebelisoa sa ho fetola khatello ho data ea ho kena ha turbine le bophahamo.
3. Matla a tlhahiso ea jenereithara (P_electric)
E nkiloe phanele ea taolo (kW kapa MW) ka data ea matla haeba ho hlokahala.
4. Bokgoni ba jenereithara (η_jenereithara)
Hangata e fumaneha karolong ea teko ea fektheri 'me e itšetlehile ka mojaro.
5. Lebelo la ho potoloha (n) le torque (T) (haeba e fumaneha)
E thusa ho bala matla a shaft ka kotloloho.
Boleng ba data bo bohlokoa haholo. Liphoso tse nyane ho tekanyo ea hlooho kapa phallo li ka fella ka ho kheloha ho hoholo ha ts'ebetso.
-
6. Mehato ea ho Bala Bokhoni ba Turbine
Mona ke phallo e bonolo eo u ka e latelang:
1. Bokella lintlha tsa ts'ebetso ha turbine e tsitsitse (boemo bo tsitsitseng): Q, H_netto, P_electric, cos φ (haeba ho hlokahala).
2. Bala matla a haeteroliki:
\[
P_{hydraulic} = \rho g QH
\]
3. Khakanyo ea matla a mechini a shaft:
– Haeba ho na le sensor ea torque: sebelisa \(P_{mechanical} = 2\pi nT/60\).
– Ho seng jwalo: sebedisa \(P_{mechanical} \approx P_{electrical}/\eta_{generator}\).
4. Bala bokgoni ba turbine:
\[
\eta_t = P_{mechanical}/P_{hydraulic}
\]
5. Bapisa le mothapo wa tshebetso wa turbine (chate ya leralla kapa mothapo wa bokgoni) ho tswa ho moetsi ho hlahloba hore na o utlwahala.
-
7. Mohlala o Bonolo oa Palo
A re re yuniti ea motlakase oa metsi e na le lintlha tse latelang:
– Ho ntsha metsi \(Q\) = 12 m³/s
– Hlooho ea 'nete \(H\) = 45 m
– Botebo ba metsi \( \rho \) = 1000 kg/m³
– Matla a khoheli \( g \) = 9,81 m/s²
– Matla a motlakase a lekantsoeng \(P_{electricity}\) = 4,6 MW
– Bokgoni ba jenereithara \( \eta_{jenereithara} \) = 0,97
1) Matla a haeteroliki
\[
P_{hydraulic} = 1000 \makhetlo a 9,81 \makhetlo a 12 \makhetlo a 45
\]
\[
P_{hydraulic} = 5.297.400 \text{ W} \hoo e ka bang 5,30 \text{ MW}
\]
2) Matla a mechini a shaft (a hakantsoeng)
\[
P_{mechanical} \hoo e ka bang \frac{4,6}{0,97} = 4,742 \mongolo{MW}
\]
3) Bokgoni ba Turbine
\[
\eta_t = \frac{4,742}{5,30} \makgetlo a 100\% \hoo e ka bang 89,5\%
\]
Sephetho sa 89,5% sea utloahala bakeng sa liturbine tse ngata tsa karabelo tse sebetsang haufi le tse ntle ka ho fetisisa, leha bonnete ba ho qetela bo ntse bo hloka ho netefatsoa ka li-curve tsa ts'ebetso le ho nepahala ha lisebelisoa.
-
8. Mabaka a Amang Bokgoni ba Turbine
Bokgoni ba turbine bo ka fokotseha ka mabaka a latelang:
– Tshebetso e hole le moo moralo o leng teng (ho ntsha metsi ho tlase haholo/hodimo haholo, ho jara thepa ho sa lokelang).
– Ho thiba molomo, haholo-holo lihloohong tse itseng kapa likhatellong tsa ho ntša metsi tse tlase haholo.
– Tšenyo kapa khoholeho ea lehare ka lebaka la seretse/lehlabathe (abrasion).
– Tahlehelo ea haeteroliki e eketseha ka lebaka la li-penstock tse litšila, li-rack tsa lithōle tse koetsoeng, kapa li-valve tse sa lokelang.
– Liphoso tsa ho lekanya hlooho le phallo tse etsang hore katleho e bonahale e fokotseha ha e sa fokotsehe.
Ka hona, tlhahlobo ea katleho e lokela ho etsoa nako le nako, 'me e tsamaee le tlhahlobo ea boemo ba mechini le netefatso ea lisebelisoa.
-
9. Qetello
Ho bala bokgoni ba turbine tsamaisong ya motlakase wa metsi ho kenyeletsa ho bapisa matla a haeteroliki a metsi le matla a mechini a tshwarwang ke turbine. Senotlolo sa ho bala ka katleho se itshetlehile tshebedisong ya hlooho ya letlowa, ditekanyo tse tshepahalang tsa ho ntsha metsi, le karohano ya bokgoni ba turbine ho bokgoni ba jenereithara. Ka dipalo tse nepahetseng, basebetsi ba ka fumana dintlha tse ntle tsa tshebetso, ba lemoha matshwao a pele a ho senyeha ha tshebetso, mme ba ntshetsa pele mawa a tlhokomelo a loketseng haholoanyane.
Haeba o batla, nka o thusa ho theha template ya dipalo (Excel) ho latela data ya Q, H, P_electricity, le η_generator, kapa ho e etsa hore e be ya mofuta o itseng wa turbine (Francis/Kaplan/Pelton) hammoho le mokhoa wa ho bala mothapo wa bokgoni ba moetsi.
