Mfundo yogwirira ntchito ya ma electrode a graphite amphamvu kwambiri (UHP) imachokera makamaka ku arc discharge. Pogwiritsa ntchito mphamvu zawo zamagetsi, kukana kutentha kwambiri, komanso mphamvu zamakaniko, ma electrode awa amalola kusintha bwino mphamvu zamagetsi kukhala mphamvu yotentha m'malo osungunula kutentha kwambiri, motero kuyendetsa njira yachitsulo. Pansipa pali kusanthula kwatsatanetsatane kwa njira zawo zazikulu zogwirira ntchito:
1. Kutulutsa Arc ndi Kusintha kwa Mphamvu ya Magetsi Kukhala Kutentha
1.1 Njira Yopangira Arc
Ma electrode a graphite a UHP akaphatikizidwa mu zida zosungunulira (monga, ng'anjo zamagetsi), amagwira ntchito ngati chowongolera mpweya. Kutulutsa kwamphamvu kwamagetsi kumapanga chingwe chamagetsi pakati pa nsonga ya electrode ndi mphamvu ya ng'anjo (monga, chitsulo chotsalira, miyala yachitsulo). Chingwechi chimakhala ndi njira yoyendetsera mpweya yopangidwa ndi ionization ya gasi, kutentha komwe kumapitirira 3000°C—kuposa kutentha kwachizolowezi koyaka.
1.2 Kutumiza Mphamvu Moyenera
Kutentha kwakukulu komwe kumapangidwa ndi arc kumasungunula mwachindunji mphamvu ya ng'anjo. Mphamvu yamagetsi yapamwamba kwambiri ya ma electrode (yomwe imachepetsa mphamvu ya resistivity mpaka 6–8 μΩ·m) imatsimikizira kuti mphamvu yamagetsi imachepa kwambiri panthawi yotumiza, zomwe zimapangitsa kuti mphamvu igwiritsidwe ntchito bwino. Mwachitsanzo, popanga zitsulo za arc furnace (EAF), ma electrode a UHP amatha kuchepetsa kuzungulira kwa kusungunula ndi 30%, zomwe zimapangitsa kuti pakhale zokolola zambiri.
2. Katundu wa Zinthu ndi Chitsimikizo cha Magwiridwe Antchito
2.1 Kukhazikika kwa Kapangidwe Kotentha Kwambiri
Kulimba kwa ma electrode pa kutentha kwakukulu kumachokera ku kapangidwe kawo ka kristalo: maatomu a kaboni ophatikizidwa amapanga netiweki ya covalent bond kudzera mu sp² hybridization, yokhala ndi interlayer binding kudzera mu van der Waals forces. Kapangidwe kameneka kamasunga mphamvu ya makina pa 3000°C ndipo kamapereka kukana kwapadera kwa kutentha (ngakhale kutentha kusinthasintha kwa mpaka 500°C/min), kopambana ma electrode achitsulo.
2.2 Kukana Kuwonjezeka kwa Kutentha ndi Kuyenda
Ma electrode a UHP ali ndi mphamvu yochepa yokulitsa kutentha (1.2×10⁻⁶/°C), kuchepetsa kusintha kwa mawonekedwe pa kutentha kwakukulu ndikuletsa kupangika kwa ming'alu chifukwa cha kutentha kwambiri. Kukana kwawo kugwedezeka (kuthekera kolimbana ndi kusintha kwa pulasitiki pansi pa kutentha kwakukulu) kumakonzedwa bwino kudzera mu kusankha zinthu zopangira singano ndi njira zapamwamba zojambulira, kuonetsetsa kuti mawonekedwe ake ndi olimba panthawi yogwira ntchito yayitali.
2.3 Kusungunuka kwa Oxidation ndi Kukana Kudzimbiri
Mwa kugwiritsa ntchito ma antioxidants (monga borides, silicides) ndikugwiritsa ntchito zokutira pamwamba, kutentha kwa oxidation kwa ma electrode kumakwera pamwamba pa 800°C. Kusagwira ntchito kwa mankhwala motsutsana ndi slag yosungunuka panthawi yosungunula kumachepetsa kugwiritsa ntchito ma electrode mopitirira muyeso, ndikuwonjezera nthawi ya moyo wa ma electrode mpaka kuwirikiza kawiri mpaka katatu kuposa ma electrode wamba.
3. Kugwirizana kwa Njira ndi Kukonza Kachitidwe
3.1 Kuchuluka kwa Mphamvu ndi Mphamvu Zamakono
Ma electrode a UHP amathandizira kuchuluka kwa magetsi opitilira 50 A/cm². Akaphatikizidwa ndi ma transformer amphamvu kwambiri (monga 100 MVA), amaloleza mphamvu zamagetsi zolowera mu ng'anjo imodzi zopitilira 100 MW. Kapangidwe kameneka kamathandizira kuchuluka kwa kutentha komwe kumalowa panthawi yosungunulira—monga, kuchepetsa kugwiritsa ntchito mphamvu pa tani imodzi ya silicon popanga ferrosilicon kufika pansi pa 8000 kWh.
3.2 Kuyankha Mosinthasintha ndi Kuwongolera Machitidwe
Makina amakono osungunula zitsulo amagwiritsa ntchito Smart Electrode Regulators (SERs) kuti aziyang'anira nthawi zonse malo a electrode, kusinthasintha kwa magetsi, ndi kutalika kwa arc, kusunga kuchuluka kwa ma electrode omwe amagwiritsidwa ntchito mkati mwa chitsulo cha 1.5–2.0 kg/t. Kuphatikiza ndi kuyang'anira mpweya wa uvuni (monga CO/CO₂ ratios), izi zimathandizira kuti ma electrode-charge coupling agwire bwino ntchito.
3.3 Kulimbikitsa Mgwirizano wa Dongosolo ndi Kugwira Ntchito Moyenera kwa Mphamvu
Kugwiritsa ntchito ma electrode a UHP kumafuna zomangamanga zothandizira, kuphatikizapo makina amphamvu amphamvu (monga, kulumikizana mwachindunji kwa 110 kV), zingwe zoziziritsidwa ndi madzi, ndi zida zosonkhanitsira fumbi bwino. Ukadaulo wobwezeretsa kutentha (monga, kupanga pamodzi kwa ng'anjo yamagetsi yochokera ku gasi) umakweza mphamvu zonse kufika pa 60%, zomwe zimathandiza kuti mphamvu zigwiritsidwe ntchito mopitirira muyeso.
Kumasulira kumeneku kumasunga kulondola kwaukadaulo pamene kukutsatira malamulo a maphunziro/mafakitale, kuonetsetsa kuti omvera apadera akumva bwino.
Nthawi yotumizira: Meyi-06-2025