Zokonzera za Chipata Chowongolera Mayendedwe Kuti Mukonze Magwiridwe Abwino a Turbine
Mu makina opangira magetsi ndi mafakitale, ma turbine amagwira ntchito posintha mphamvu yamadzi (madzi, nthunzi, kapena gasi) kukhala mphamvu yamakina, yomwe imasinthidwa kukhala mphamvu yamagetsi kapena mphamvu yozungulira. Kuti njira yosinthira mphamvuyi ikhale yogwira mtima, kuwongolera kuyenda kwamadzi ndi chinthu chofunikira kwambiri. Gawo limodzi lofunika kwambiri pakulamulira uku ndi chipata chowongolera kuyenda (chipata chowongolera kuyenda/chipata chowongolera/chipata cha wicket/valavu ya nozzle, kutengera mtundu wa turbine). Kusintha koyenera kwa chipata chowongolera kuyenda kumatha kuwonjezera magwiridwe antchito, kukhazikika kuzungulira, kuchepetsa kugwedezeka, ndikuwonjezera moyo wa zida. Nkhaniyi ikufotokoza mfundo, njira, ndi njira zabwino kwambiri zosinthira chipata chowongolera kuyenda kuti zigwire bwino ntchito ya turbine.
1. Udindo wa Zipata Zowongolera Kuyenda kwa Madzi mu Machitidwe a Turbine
Chipata chowongolera kuyenda kwa madzi chimagwira ntchito yowongolera kuchuluka kwa madzi ndi/kapena njira yolowera mu runner (turbine blades). Mu ma turbine amadzi a Francis ndi Kaplan, gawoli nthawi zambiri limatenga mawonekedwe a guide vane kapena wicket gate yomwe imatha kuzungulira kuti itsogolere madzi pa ngodya inayake. Mu ma turbine a Pelton, kulamulira kumachitika kudzera mu nozzle ndi spear/sino zomwe zimatsogolera madzi kupita ku chidebe. Mu ma turbine a nthunzi kapena gasi, lingaliroli ndi lofanana, ngakhale kuti mawu ndi njira zake zingasiyane (valvu yowongolera, inlet guide vane, ndi zina zotero).
Kukhazikitsa chipata cholowera madzi sikumangotanthauza kuchuluka kwa madzi omwe amalowa, komanso momwe amalowera. Kulunjika ndi mtundu wa madzi omwe amalowa (monga liwiro la kuzungulira, kugwedezeka, ndi kugawa liwiro) zimakhudza kwambiri mphamvu yomwe wothamanga amalandira. Chifukwa chake, chipata cholowera madzi ndi chinthu chofunikira kwambiri pakukwaniritsa malo abwino kwambiri ogwirira ntchito (BEP).
2. Zoyambira Zokonza: Kuthamanga kwa Mayendedwe, Mutu, ndi Kugwira Ntchito Mwachangu
Kugwira ntchito kwa turbine kumakhudzidwa ndi magawo angapo akuluakulu:
1. Mutu (H): kusiyana kwa kutalika kwa mphamvu (kupanikizika) komwe kulipo.
2. Kutulutsa (Q): kuchuluka kwa madzi pa nthawi iliyonse.
3. Liwiro lozungulira (n) ndi mphamvu: zotsatira za kuyanjana kwa kayendedwe ka madzi ndi wothamanga.
4. Kugwira ntchito bwino (η): chiŵerengero cha mphamvu yotulutsa mphamvu yolowera.
Kawirikawiri, mphamvu ya hydraulic yomwe ilipo ikhoza kuwerengedwa pogwiritsa ntchito fomula iyi:
P = ρ · g · Q · H ,
pomwe ρ ndiye kuchuluka kwa madzi ndipo g ndiye kufulumira kwa mphamvu yokoka. Chipata chowongolera kuyenda kwa madzi chimakhudza kwambiri Q ndi makhalidwe a kuyenda kwa madzi, motero zimakhudza mwachindunji mphamvu, magwiridwe antchito, komanso kukhazikika kwa magwiridwe antchito.
Komabe, kuwonjezeka kwa kuchuluka kwa madzi sikutanthauza kuti nthawi zonse kumakhala kogwira ntchito bwino. Ma turbine amakhala ndi malo abwino ogwirira ntchito. Ngati kuchuluka kwa madzi kuli kotsika kwambiri, kutayika kwa kukangana ndi kuyenda kosakhazikika kumakhala kwakukulu. Ngati kuchuluka kwa madzi kuli kokwera kwambiri, chiopsezo cha cavitation, turbulence, ndi makina odzaza chimawonjezeka. Apa ndi pomwe kusintha kwa chipata molondola ndikofunikira.
3. Cholinga cha Kukhazikitsa Zitseko Zowongolera Kuyenda kwa Madzi
Cholinga chokhazikitsa chitseko chowongolera kuyenda kwa madzi nthawi zambiri chimakhala:
- Kusunga kasinthasintha ka turbine pamtengo womwe mukufuna (kogwirizana ndi dongosolo lamagetsi kapena zofunikira pa njira).
- Amatsatira kusintha kwa katundu (kutsata katundu) popanda kuyambitsa kusaka kapena kugwedezeka.
- Konzani bwino ntchito yanu pansi pa mikhalidwe yosiyanasiyana ya mutu ndi kayendedwe kake.
- Amachepetsa chiopsezo cha cavitation mwa kusunga kupanikizika kochepa m'malo ovuta.
- Amachepetsa kugwedezeka ndi phokoso chifukwa cha kuyenda kosafanana.
- Zimateteza zida ku nyundo yamadzi ndi kupsinjika kwakanthawi.
Mwa kuyankhula kwina, chipata chowongolera kuyenda kwa madzi si "mpweya" wongowonjezera mphamvu, koma chida chowongolera chomwe chimatsimikizira mtundu wa ntchito ya turbine.
4. Njira Yokhazikitsira: Kulamulira Pamanja, Kokha, ndi Kwamakono
a. Zokonzera za Buku
Mu malo ena ang'onoang'ono oyika, zipata zoyendera madzi zimagwiritsidwabe ntchito pamanja. Njirayi ndi yosavuta koma ili ndi zovuta: kuyankha pang'onopang'ono, kudalira wogwiritsa ntchito, komanso kuvutika kusunga zinthu zabwino kwambiri panthawi yosinthasintha kwa katundu. Kugwiritsa ntchito pamanja ndikoyenera kwambiri pakugwira ntchito mokhazikika popanda kusintha kwa katundu pafupipafupi.
b. Bwanamkubwa Wachikhalidwe (Wodzipangira Wekha)
Mu malo opangira magetsi, zipata zowongolera kuyenda kwa madzi nthawi zambiri zimayendetsedwa ndi gavana, yomwe imasunga liwiro/mafupipafupi. Pamene katundu akuwonjezeka, liwiro limakhala lochepa, ndipo gavana amatsegula zipata kuti awonjezere liwiro la kuyenda kwa madzi. Pamene katundu akuchepa, zipata zimatsekedwa. Dongosololi limatha kugwira ntchito motsatira madzi kapena motsatira magetsi.
Chofunika kwambiri kuti gavana agwire bwino ntchito ndikusintha njira zowongolera kuti zitsimikizire kuti yankho lichitika mwachangu popanda kuyambitsa kuukira koopsa. Kuyankha mwamphamvu kwambiri kungayambitse nyundo yamadzi, pomwe kuyankha pang'onopang'ono kungayambitse kusakhazikika kwa pafupipafupi.
c. Kuwongolera Kogwirizana ndi Kukonza (Kwa digito ndi Kuyang'anira)
Mu machitidwe amakono, njira yowongolera ma flow gate imatha kugwirizanitsidwa ndi masensa ndi zowongolera za digito monga PLC/SCADA kapena DCS. Ndipotu, mafakitale ena amagwiritsa ntchito:
- Kulamulira kogwiritsa ntchito ma curve moyenera (kamera/ma curve ogwira ntchito): kutsegula kwa chipata kumakhazikitsidwa motsatira mapu ogwira ntchito bwino kutengera mutu ndi zolinga zamphamvu.
– Kuwongolera kolosera zam'tsogolo kwa chitsanzo (MPC): kumaneneratu momwe dongosolo limayankhira ndikusankha kutseguka koyenera poganizira malire a kuthamanga, kugwedezeka, ndi liwiro la ramp.
– Kuwongolera kosinthika: magawo owongolera amasintha malinga ndi momwe zinthu zilili (monga kusintha kwa makhalidwe chifukwa cha kuwonongeka).
Njira imeneyi imathandiza kuti turbine ikhale pafupi ndi BEP pansi pa mikhalidwe yosiyanasiyana yogwirira ntchito.
5. Kugwirizanitsa Chipata ndi Zigawo Zina
Makonzedwe a chipata cha flow nthawi zambiri amasiyana. Mwachitsanzo, mu turbine ya Kaplan, pali makonzedwe awiri oyambira: chipata cha wicket ndi ngodya ya tsamba lothamanga (pitch). Kukonza magwiridwe antchito kumafuna kugwirizanitsa zonse ziwiri (kulamulira kawiri). Kutsegula chipata kolondola koma pitch yolakwika kungachepetse magwiridwe antchito ndikuwonjezera cavitation. Chifukwa chake, tchati chogwirira ntchito nthawi zambiri chimagwiritsidwa ntchito chomwe chimafotokoza kuphatikiza kwa kutsegula chipata ndi ngodya ya tsamba pa mutu uliwonse ndi katundu.
Mu ma turbine a Francis, cholinga chachikulu ndi kusintha ma guide vanes kuti atsimikizire kuti ngodya yolowera ikugwirizana ndi kapangidwe ka runner. Kusintha kolakwika kungayambitse kuzungulira kwakukulu ndikuwonjezera kutayika kwa chubu cha draft.
Mu Pelton, kugwirizana kungaphatikizepo kuchuluka kwa ma nozzles ogwira ntchito (multi-jet) komanso malo a mkondo kuti ndege ikhale yokhazikika ndikuchepetsa kutayika pa katundu wochepa.
6. Mavuto Ogwira Ntchito: Kutsegula Misozi, Kugwedezeka, ndi Kudula Madzi
a. Kutsegula m'mimba
Kutsekeka kwa mpweya kumachitika pamene mphamvu ya m'deralo imatsika pansi pa mphamvu ya nthunzi, ndikupanga thovu lomwe limagwa ndikuwononga pamwamba pa chitsulo. Makonzedwe a chipata cha madzi omwe amakakamiza kuti ntchito ichitike kutali ndi malo opangidwira amatha kuchepetsa mphamvu m'malo ena, zomwe zimawonjezera chiopsezo cha kutsekeka kwa mpweya. Njira zochepetsera vutoli zikuphatikizapo:
- Pewani kugwira ntchito m'malo "oletsedwa" pamapu a cavitation.
- Amalamulira chipata kuti chitseko chitseguke bwino (chosalala komanso chopapatiza).
- Onetsetsani kuti chubu chopumira mpweya ndi makina opumira mpweya zikugwira ntchito bwino.
b. Kugwedezeka ndi Kumveka
Mabowo ena a zipata angayambitse machitidwe osakhazikika a kayendedwe ka madzi (monga zingwe za vortex m'machubu a Francis draft), zomwe zimapangitsa kuti kugwedezeka kuchuluke. Kuwongolera kayendedwe ka madzi kuyenera kuganizira za kugwedezeka ndi kuchuluka kwa kuthamanga kwa madzi. Makonzedwe ena amaika malire ogwirira ntchito kutengera kuyang'anira nthawi yeniyeni.
c. Nyundo ya Madzi ndi Kupanikizika Kwakanthawi
Kusintha chitseko chotseguka mofulumira kwambiri kungayambitse nyundo yamadzi m'chipinda chosungira madzi, zomwe zimapangitsa kuti kuthamanga kwa madzi kukwere kwambiri. Chifukwa chake, pali malire a liwiro komanso njira zoyambira/kusiya kugwiritsa ntchito, kuphatikizapo kugwiritsa ntchito ma valve othandizira kapena matanki oyendetsera madzi, ngati alipo.
7. Njira Zokonzera ndi Kukonza Zikhazikiko za Chipata
Kukonza sikungokhudza ma algorithm okha, komanso za momwe makina amagwirira ntchito komanso zida zake zimagwirira ntchito. Njira zina zofunika ndi izi:
1. Kuwerengera kwa masensa: kuchuluka kwa madzi, kuthamanga kwa mpweya, malo a chipata, kutentha kwa bearing, ndi kugwedezeka ziyenera kukhala zolondola.
2. Tsimikizirani kulumikizana ndi choyatsira: kuwonongeka, kutayikira, kapena kutayikira kwamadzimadzi kungalepheretse chipata kuti chisayime monga momwe zalangizidwira.
3. Kujambulanso ma curve a efficiency: pambuyo pa kusintha kapena kusintha kwa hydrological conditions, curve yoyenera yogwirira ntchito ingasinthe.
4. Kusanthula deta yogwira ntchito (zomwe zikuchitika): gwiritsani ntchito mbiri yakale kuti mudziwe momwe zinthu zimatayikira, kusaka, kapena madera omwe amagwedezeka kwambiri.
5. Mayeso a yankho la bwanamkubwa: kusintha magawo owongolera kuti akhale okhazikika, achangu, komanso otetezeka motsutsana ndi zinthu zosakhalitsa.
6. Kuyang'anira malo ogwirira ntchito: dziwani malo otetezeka otsegulira, malo abwino kwambiri ogwirira ntchito, ndi madera oti mupewe.
7. Kusamalira nthawi zonse: kuwunika ma guide vanes, ma seal, ma bearing, ndi machitidwe amafuta/hydraulic kumatsimikizira kuyenda bwino komanso kolondola kwa chipata.
8. Kesimpulan
Zipata zowongolera kuyenda kwa madzi ndiye maziko a turbine. Mwa kuwongolera kuchuluka kwa kuyenda kwa madzi ndi momwe madzi amalowera mu runner, zipata izi zimatsimikiza kutulutsa kwa mphamvu, magwiridwe antchito, komanso kukhazikika kwa ntchito. Kuwongolera bwino kumafuna kumvetsetsa mawonekedwe a turbine, momwe mutu ndi katundu wake zimakhalira, komanso kugwirizana ndi zinthu zina monga blade pitch (mu Kaplan) kapena nozzle (mu Pelton). Kuphatikiza apo, zinthu zachitetezo monga kupewa cavitation ndi water hammer ziyenera kukhala zofunika kwambiri.
Mu nthawi ya digito, kuphatikiza kwa masensa odalirika, zowongolera zolondola zokha, ndi kusanthula deta kumathandiza ma turbines kugwira ntchito nthawi zonse pafupi ndi momwe amagwirira ntchito bwino. Pomaliza pake, kuyang'anira bwino zipata zoyendetsera kayendedwe ka madzi sikuti kumawonjezera kupanga mphamvu zokha komanso kumachepetsa ndalama zokonzera ndikuwonjezera moyo wonse wa makina a turbine.
