Momwe Zitsime Zotentha Zimagwirira Ntchito ndi Kukhazikitsa
Mphamvu ya geothermal ndi gwero la mphamvu yongowonjezwdwa yomwe imagwiritsa ntchito kutentha kuchokera pansi pa nthaka. M'mayiko ambiri, kuphatikizapo Indonesia, yomwe ili m'mbali mwa Ring of Fire, mphamvu ya geothermal ili ndi kuthekera kwakukulu kopangira magetsi ndi kugwiritsa ntchito kutentha mwachindunji. Chimodzi mwazinthu zofunika kwambiri pakugwiritsa ntchito mphamvu ya geothermal ndi chitsime cha geothermal, dzenje lobowoledwa kuti mupeze madzi otentha (nthunzi ndi/kapena madzi otentha) kuchokera ku dziwe la pansi pa nthaka. Nkhaniyi ikufotokoza momwe chitsime cha geothermal chimagwirira ntchito komanso njira zonse zoyikira.
1. Kodi chitsime cha geothermal n'chiyani?
Chitsime cha geothermal ndi chitsime chomwe chimabowoledwa mozama kuti chifike kudera losungiramo madzi otentha. Chitsimechi chimakhala ndi madzi otentha opanikizika, chisakanizo cha nthunzi, madzi otentha, ndi mpweya wosazizira (monga CO₂ ndi H₂S m'magulu enaake). Pali mitundu yoposa umodzi ya zitsime za geothermal; munda wa geothermal nthawi zambiri umakhala ndi:
1. Chitsime chopangira: madzi otentha amatuluka pamwamba kuti agwiritsidwe ntchito.
2. Jambulani chitsime: bwezeretsani madzi oundana kapena madzi amchere (madzi otentha okhala ndi mchere wambiri) ku thanki kuti mpweya ukhalebe wokhazikika komanso kuti chilengedwe chitetezedwe bwino.
3. Kuyang'anira zitsime: kuyang'anira kuthamanga kwa madzi, kutentha ndi momwe madzi amayendera.
Ndi kuphatikiza kwa zitsime kumeneku, dongosolo la kutentha kwa dziko lapansi limatha kugwira ntchito bwino, kusunga bwino malo osungiramo madzi ndikuwonjezera nthawi yogwirira ntchito yamunda.
2. Momwe zitsime za geothermal zimagwirira ntchito
Momwe chitsime cha geothermal chimagwirira ntchito zimadalira mawonekedwe a dziwe losungiramo madzi ndi ukadaulo wopanga womwe umagwiritsidwa ntchito. Komabe, mfundo yaikulu ikutsatira izi:
a) Kutentha kwa dziko lapansi kumapangidwa ndikusungidwa m'malo osungiramo madzi
Kutentha kumachokera mkati mwa Dziko Lapansi, kaya kuchokera ku ntchito ya magma kapena kutentha kwachilengedwe. Madzi apansi panthaka omwe amatsikira pansi amatenthedwa ndi kukodwa mu miyala yobowoka kapena yosweka, ndikupanga malo osungiramo madzi. Kupanikizika kwakukulu pakuya kumalola madzi kusunga mphamvu zambiri.
b) Madzi otentha amatuluka kudzera m'chitsime chopangira
Chitsime chopangira zinthu chikatsegulidwa, kusiyana kwa kuthamanga kwa madzi kumapangitsa kuti madziwo akwere mmwamba. Nthawi zina, madziwo amatha kuyenda okha (artesian) popanda pompu. M'mitundu ina—makamaka pamakina otentha kwambiri—pompu ya chitsime ingafunike.
c) Kulekanitsa nthunzi ndi madzi (ngati pakufunika)
Ngati madzi otuluka ndi osakaniza nthunzi ndi madzi, cholekanitsa pamwamba chimagwiritsidwa ntchito. Nthunzi imayendetsedwa ku turbine, pomwe madzi otentha (madzi oyeretsera) amatha kubwezeretsedwa ku chitsime chobayira kapena kugwiritsidwa ntchito pazinthu zina (monga kutentha, kuumitsa, kapena ntchito zamafakitale).
d) Kusintha kukhala magetsi kapena kutentha mwachindunji
Ndondomeko zitatu zazikulu za malo opangira magetsi otenthetsera ndi:
– Nthunzi youma: nthunzi youma imazungulira mwachindunji turbine.
– Mpweya wothamanga: madzi otentha opanikizika "amatuluka" kukhala nthunzi pampweya wochepa; nthunziyo imasandutsa turbine.
– Binary cycle: Kutentha kuchokera ku madzi otentha kumatenthetsa madzi ena ogwira ntchito (monga isobutane) mu heat exchanger; madzi ogwira ntchito amasanduka nthunzi ndikusandutsa turbine. Ndondomekoyi ndi yoyenera kutentha kochepa kwa malo osungiramo madzi ndipo nthawi zambiri imakhala yotseka kwambiri, zomwe zimapangitsa kuti mpweya woipa uchepe.
e) Kubwezeretsanso madzi m'chitsime
Mphamvu ikatulutsidwa, madzi otsala nthawi zambiri amabwereranso kudzera mu chitsime chobayira jakisoni. Jakisoni amathandiza:
- sungani kuthamanga kwa madzi m'chitsime,
- kuchepetsa chiopsezo cha kuchepa kwa kupanga,
- kuchepetsa kutuluka kwa madzi amchere m'chilengedwe,
- zimathandiza kuti zinthu zipitirire kwa nthawi yayitali.
3. Magawo a kukhazikitsa zitsime za geothermal
Kukhazikitsa zitsime za geothermal ndi njira yovuta yokhudza maphunziro a za nthaka, uinjiniya wobowola, chitetezo, ndi chilolezo ndi kasamalidwe ka chilengedwe. Njira zonse ndi izi:
1) Maphunziro oyambirira ndi ofufuza
Musanayambe kuboola, kafukufuku amachitika kuti adziwe malo omwe angakonzedwe ndikuchepetsa chiopsezo cha ndalama zambiri chifukwa cha kuwonongeka kwa zitsime. Gawoli likuphatikizapo:
– Maphunziro a za nthaka: mapu a miyala, mapangidwe a zolakwika, mawonekedwe a pamwamba (akasupe otentha, fumaroles).
– Geochemistry: kusanthula kuchuluka kwa madzi otentha kuti ayese kutentha kwa dziwe ndi komwe madziwo amachokera.
– Geophysics: njira za magnetotelluric (MT), mphamvu yokoka, seismic, kapena resistivity kuti ziwonetse kapangidwe ka pansi pa nthaka.
- Kusankha malo oti chitsime chipezeke: kuganizira za malo oti chitsime chifikeko, malo ake, chitetezo chake, ndi malo omwe kutentha kungasungidwe.
Zotsatira za kufufuza zidzatsimikizira kuya kwa cholinga, njira yobowolera (yolunjika kapena yolunjika), ndi kapangidwe kaukadaulo.
2) Kupereka chilolezo, AMDAL, ndi kukonzekera malo
Popeza mapulojekiti a geothermal ndi akuluakulu ndipo nthawi zambiri amapezeka m'malo ovuta, ndikofunikira:
- chilolezo motsatira malamulo,
- maphunziro okhudza zachilengedwe (monga AMDAL),
- kukambirana ndi anthu onse ndi mapulani oyendetsera anthu.
M'mundamo, ntchito yoyeretsa malo ochepa, kumanga zitsime, njira zolowera mumsewu, ndi njira zotulutsira madzi amvula ndi kukumba matope zinachitidwa.
3) Kusonkhanitsa zida ndi zida
Zipangizo zobowolera pogwiritsa ntchito geothermal zimasiyana ndi zipangizo zobowolera pogwiritsa ntchito mafuta ndi gasi m'njira zingapo, makamaka chifukwa cha kutentha kwambiri komanso kuthekera kwa dzimbiri. Zipangizo zomwe zimanyamulidwa ndi izi:
- makina omangira ndi kukweza,
- pompu ya matope,
- chitoliro chobowolera ndi chobowolera,
- zida zowongolera zitsime (choletsa kuphulika/BOP),
- makina ogwiritsira ntchito madzi, matanki, ndi malo otetezera.
4) Kuboola pang'onopang'ono (kuboola gawo)
Zitsime za geothermal nthawi zambiri zimabowoledwa pang'onopang'ono m'mimba mwake mozama:
– Chitseko cha kondakitala: chitoliro choyamba chokhazikika pamwamba pa nthaka ndikuletsa kugwa.
– Chophimba pamwamba: chimateteza madzi osaya kwambiri ndipo chimapereka chitetezo choyamba.
– Chivundikiro chapakati (ngati kuli kofunikira): cha madera ena a miyala osakhazikika kapena opanikizika.
– Chophimba/choyikapo chopangira: chimayika mzere wozungulira malo opangira kuti chiwongolere kuyenda kwa madzi.
Pakuboola, matope oboola amagwiritsidwa ntchito kukweza miyala yodulidwa, kukhazikika pa chitsime, kuwongolera kuthamanga kwa madzi, ndikuziziritsa choboolacho. Pa kutentha kwa dziko lapansi, zovuta zina zimaphatikizapo kutayika kwa kayendedwe ka madzi chifukwa cha kusweka kwa miyala ndi kutentha kwambiri komwe kumakhudza mawonekedwe a matopewo.
5) Kukhazikitsa chikwama ndi simenti
Gawo lililonse likabowoledwa, chivundikiro ndi simenti zimayikidwa. Kuyika simenti n'kofunika kwambiri chifukwa cholinga chake ndi:
- mangani chivundikirocho ku miyala yopangidwa,
- letsa kutuluka kwa madzi pakati pa zigawo,
- thandizani kuti chitsime chikhale bwino kutentha kwambiri.
Zipangizo za simenti ya geothermal zimapangidwa kuti zikhale zotetezeka kutentha komanso kutentha kuti zisasweke pamene chitsime chikuzizira ndi kutentha.
6) Kulamulira ndi kuteteza zitsime
Mphamvu ya kutentha kwa dziko imatha kupanga nthunzi yopanikizika komanso mpweya woopsa monga H₂S. Chifukwa chake, miyezo yachitetezo ndi yokhwima kwambiri, kuphatikizapo:
- Kukhazikitsa kwa BOP,
- njira zowongolera zitsime,
- kuyang'anira gasi,
- kugwiritsa ntchito zida zodzitetezera,
- dongosolo lothandizira pa ngozi.
7) Kumaliza chitsime ndi kulimbitsa thupi
Pambuyo pofika pa cholinga, gawo lomaliza limachitidwa motere:
- kukhazikitsa chitsime ndi valavu yotetezera,
- kukhazikitsa mabowo kapena kutsegulira madera ena opangira (kutengera kapangidwe kake),
- kusonkhezera (ngati kuli kofunikira), mwachitsanzo kuyeretsa zitsime kapena kukonza kuti madzi azitha kulowa mosavuta.
Mu kutentha kwa dziko lapansi, kumalizidwa kuyenera kuganizira kukula (kuchepa kwa mchere monga silika kapena calcite) ndi dzimbiri.
8) Kuyesa kupanga (kuyesa zitsime)
Chitsime chikangobowoledwa, sichigwiritsidwa ntchito nthawi yomweyo kwamuyaya. Mayeso amachitika, monga:
- kuyesa kuyenda kwa madzi kuti muyese kuchuluka kwa nthunzi/madzi omwe amapangidwa,
- kuyeza kutentha ndi kuthamanga kwa magazi,
- kusanthula kwa mankhwala amadzimadzi,
- kuwunika kukhazikika kwa kayendedwe ka madzi ndi kuthekera kokulira.
Deta yoyesera imatsimikiza ngati chitsimecho chili choyenera kupangidwa, chikufunika kukonzedwa, kapena cholinga chake ndi kugwiritsidwa ntchito ngati chitsime chobayira jakisoni.
9) Kuphatikizana ndi malo ogwirira ntchito pamwamba
Chitsime chikayamba kugwira ntchito, chitsimecho chimalumikizidwa ku:
– mapaipi a magawo awiri (nthunzi-madzi) kapena mapaipi a nthunzi,
- cholekanitsa ndi chotsukira,
– jenereta (turbine, condenser, nsanja yoziziritsira),
- mzere wobwezera jakisoni.
Netiweki yonseyi yapangidwa kuti izitha kupirira kutentha kwambiri, kupsinjika, komanso zinthu zowononga.
4. Mavuto akuluakulu pakuyika zitsime za geothermal
Kukhazikitsa zitsime za geothermal kumakumana ndi mavuto apadera, monga:
- Kutentha kwambiri komwe kumachedwetsa kuwonongeka kwa zida ndikukhudza simenti/chidebe.
- Kutayika kwa kayendedwe ka madzi m'mwala wosweka, zomwe zingawonjezere ndalama zobowola ndi nthawi.
- Kukulitsa ndi dzimbiri zomwe zimakhudza mapaipi ndi zida zapamwamba.
- Zoopsa za H₂S ndi mpweya woipa womwe umatulutsa zomwe zimafuna njira zochepetsera ndi kuwunika.
- Kufika pamalo nthawi zambiri kumakhala m'mapiri kotero kuti zinthu zoyendera zimakhala zovuta.
Chifukwa chake, kapangidwe ka geothermal, zipangizo, ndi njira zogwirira ntchito zimagogomezera kwambiri kudalirika kwa nthawi yayitali.
5. Mapeto
Zitsime za geothermal ndiye njira yayikulu yopezera mphamvu ya geothermal: madzi otentha ochokera m'malo osungiramo madzi amatengedwa kudzera m'zitsime zopangira, kukonzedwa pamwamba kuti apange magetsi kapena kutentha mwachindunji, kenako nkubwezedwa pansi pa nthaka kudzera m'zitsime zopangira madzi kuti dongosolo likhale lokhazikika komanso lokhazikika. Kukhazikitsa kumafuna masitepe angapo, kuyambira kufufuza ndi kulola mpaka kubowola ndi kuyika chidebe ndi simenti, mpaka kuyesa kupanga ndi kuphatikiza malo opangira magetsi. Ndi kukonzekera mosamala komanso miyezo yapamwamba yachitetezo, zitsime za geothermal zimatha kukhala zomangamanga zothandiza kusintha kwa mphamvu zoyera komanso chitetezo cha mphamvu za dziko.
Ngati mukufuna, nditha kusintha nkhaniyi kuti ikhale yaukadaulo kwambiri (monga kuwonjezera magawo a casing, mitundu ya simenti, ndi wellhead schematics) kapena yotchuka kwambiri kwa owerenga ambiri, komanso kuonetsetsa kuti mawu ali pafupifupi mawu 1000 ngati pakufunika.
