Katundu ndi Kugwiritsa Ntchito kwa Graphite Electrodes

Maelekitirodi a graphite ndiye chinthu chimodzi chofunikira kwambiri chomwe chimagwiritsidwa ntchito popanga zitsulo zamagetsi arc (EAF). Amanyamula mafunde akuluakulu - nthawi zambiri 100,000 amperes kapena kuposa - kulowa mu ng'anjo, kutembenuza mphamvu yamagetsi kukhala kutentha komwe kumasungunula zitsulo. Komabe kwa zinthu zomwe zimawoneka ngati silinda wakuda wakuda, ma electrode a graphite ndi zinthu zovuta modabwitsa, zomwe zimatanthauzidwa ndi zenizeni zenizeni zakuthupi ndikupangidwa kudzera pamilungu yambiri, njira zambiri.

Bukuli likufotokoza za zinthu zofunika Ma electrode a graphite, momwe zinthuzo zimasinthira zochitika zenizeni padziko lapansi, kusiyana pakati pa magiredi a RP, HP ndi UHP, ndi mitundu yonse ya ntchito mafakitale. Kaya ndinu woyendetsa zitsulo, woyang'anira malo, kapena katswiri wogula zinthu, nkhaniyi ikuthandizani kumvetsetsa zomwe muyenera kuyang'ana - komanso momwe mungasankhire electrode yoyenera pang'anjo yanu.

Kodi Graphite Electrodes Ndi Chiyani?

A graphite electrode ndi cylindrical conductor wopangidwa makamaka ndi petroleum coke, singano coke ndi malasha phula phula, amene amawotcha ndiyeno graphitized pa kutentha kwambiri. Chotsatira chake ndi thupi lolimba, lochepa la carbon lomwe lingathe kupirira kutentha kwakukulu, magetsi ndi makina mkati mwa ng'anjo yamagetsi yamagetsi.

Mwadongosolo, electrode system imakhala ndi magawo awiri:

• Chigawo cha electrode - thupi lalikulu la cylindrical lomwe limapereka zamakono ku ng'anjo.
• Nipple (joint) - pini yolumikizira yolumikizidwa yomwe imalumikiza magawo otsatizana a electrode kuti apange mzati wopitilira.

Chifukwa palibe chidutswa chimodzi chomwe chimakhala chachitali kuti chifike kuchokera padenga lang'anjo kupita ku bafa losungunuka, magawo angapo a ma elekitirodi amasonkhanitsidwa pamodzi pogwiritsa ntchito nsonga zamabele. Pamene nsonga imadyedwa panthawi yosungunuka, zigawo zatsopano zimawonjezeredwa pamwamba - ndondomeko yopitilira "kudyetsa".

Ma elekitirodi atatu nthawi zambiri amasanjidwa munjira yamakona atatu pang'anjo yamagetsi yamagetsi ya AC ya magawo atatu. Elekitirodi iliyonse, denga la ng'anjo, ndi chitsulo chosungunula pamodzi zimapanga magetsi omwe amachirikiza arc.

Chifukwa chiyani graphite m'malo mwa carbon ina?

Graphite imasankhidwa kuti ikhale maelekitirodi chifukwa imaphatikiza mwapadera zinthu zinayi zomwe palibe zinthu zina zotsika mtengo zomwe zimaperekedwa pamafakitale:

• Zabwino kwambiri zamagetsi madutsidwe - apamwamba kwambiri kuposa amorphous carbon, kuchepetsa kutaya mphamvu.
• Kukhazikika kwamafuta kwambiri - graphite sichisungunuka; imatsika kuposa ~ 3,650 ° C, kupitilira kutentha kwa ng'anjo.
• Kukula kwamafuta ochepa - kuchepetsa kusweka chifukwa cha kutenthedwa kwa kutentha pamene arc ikuyaka ndikuzimitsa.
• Kuthekera - graphite imatha kupangidwa ndendende kukhala ulusi wopindika komanso nsonga zamabele zolimba.

Momwe Graphite Electrodes Amapangidwira

Kumvetsetsa momwe zinthu zimapangidwira zimafotokozera chifukwa chake katundu amasiyana pakati pa magiredi ndi chifukwa chake khalidwema electrode a graphitelamula premium. Njira yokhazikika yopangira zinthu imakhala ndi njira zazikulu izi:

1. Kusankha zakuthupi & calcination - Petroleum coke kapena singano coke ndi calcined (kutenthedwa) kuchotsa volatiles ndi kusintha kachulukidwe. Coke ya singano, yokhala ndi mawonekedwe ake a crystalline kwambiri, ndiye chinthu chofunikira kwambiri pamaphunziro a HP ndi UHP.
2. Kuphwanya, kukula & kuphatikiza - Coke imaphwanyidwa ndikugawidwa m'magulu a tinthu tating'ono, kenaka imasakanizidwa ndi phula la malasha ngati chomangira mwatsatanetsatane.
3. Kusakaniza & kukanda - Zowuma zowuma ndi phula zimasakanizidwa pa kutentha kolamulidwa kuti apange phala lofanana.
4. Extrusion (kupanga) - The phala ndi extruded mu yaitali cylindrical "wobiriwira" maelekitirodi a m'mimba mwake chofunika.
5. Kuphika - Maelekitirodi obiriwira amawotcha pafupifupi 800-1,200 ° C kuti apangitse phula kukhala chigoba cholimba cha kaboni.
6. Impregnation - Ma electrode ophika amathiridwa ndi phula pansi pa kukanikiza ndikuwotchanso, kudzaza porosity yamkati kuti awonjezere kachulukidwe ndi mphamvu.
7. Kujambula zithunzi - Thupi la kaboni limatenthedwa pafupifupi 2,800-3,000 ° C mung'anjo ya Acheson kapena kutalika kwa graphitization, kutembenuza mpweya wa amorphous kukhala crystalline graphite ndikuchepetsa kwambiri mphamvu yamagetsi.
8. Machining - Elekitirodi yomalizidwayo imapangidwa kuti ikhale yomaliza, ndipo zitsulo zokhala ndi tepi zimatopa ndikumangika kuti zivomereze nsongayo.

Kuzungulira konseko kumatha kutenga masabata angapo, chomwe ndi chifukwa chimodzi chomwe ma elekitirodi amakhudzidwa ndi msika komanso chifukwa chake nthawi zotsogola ndizofunikira pakugula.

Zofunika Kwambiri za Graphite Electrodes

Zinthu zotsatirazi ndizomwe akatswiri ndi magulu ogula zinthu amawunika akamatchula electrode. Makhalidwe amaperekedwa monga osiyanasiyana osiyanasiyana kwa magiredi amalonda; ziwerengero zenizeni zimasiyana malinga ndi wopanga komanso kalasi.

1.Kukaniza Magetsi (µΩ·m)

Kukaniza kumayesa momwe ma elekitirodi amatsutsira mwamphamvu kuyenda kwapano. Pansi ndi bwino: kutsika kwa resistivity kumatanthauza mphamvu zochepa zamagetsi zomwe zimatayika monga kutentha mkati mwa electrode yokha, kotero mphamvu zambiri zimafika ku arc. Maelekitirodi a UHP amapeza zotsika kwambiri (nthawi zambiri 5–7 µΩ·m) chifukwa cha singano coke ndi graphitization yonse, pomwe ma elekitirodi a RP ndi apamwamba (pafupifupi 7.5–9.5 µΩ·m).

2.Flexural Strength (MPa)

Mphamvu ya Flexural (kupindika) ikuwonetsa kukana kusweka kwa mawotchi panthawi yogwira, kukonza ndime, komanso kupsinjika kwamakina komwe kumasungunuka - makamaka m'mapanga ndi kusuntha kwa denga. Mphamvu zapamwamba zimachepetsa chiopsezo cha kusweka kwa nipple ndi electrode, chomwe ndi chifukwa chachikulu cha nthawi yopuma komanso kutayika kwa zokolola.

3.Kuchulukirachulukira (g/cm³)

Kuchulukana kwakukulu kumawonetsa momwe ma elekitirodi ali olimba komanso ophatikizika. Ma electrode a denser nthawi zambiri amakhala ndi mphamvu zotsika, mphamvu zapamwamba komanso kukana bwino kwa okosijeni chifukwa mkati mwake mulibe porosity yocheperako kuti mpweya uwukire. Miyezo yodziwika bwino imayambira pafupifupi 1.58 g/cm³ (RP) mpaka 1.75 g/cm³ (UHP).

4.Young's Modulus (GPA)

Elastic modulus amafotokoza kuuma. Modulus yapakatikati ndiyofunikira kwenikweni: ma elekitirodi omwe ali olimba kwambiri amatulutsa kupsinjika kwa kutentha ndipo sachedwa kusweka, pomwe yomwe ili yofewa kwambiri imatha kupunduka. Kukhazikika pakati pa mphamvu ndi modulus ndi gawo lalikulu la mapangidwe a electrode.

5. Coefficient of Thermal Expansion — CTE (×10⁻⁶/°C)

Kukula kwamafuta otsika komanso kofananako kumachepetsa kusweka pomwe nsonga ya elekitirodi imatentha mwachangu pakuyatsa kwa arc. Mapangidwe a singano coke amapereka HP ndiMa electrode a UHPCTE yotsika komanso yofananira, yomwe ili pakatikati pa kukana kwawo kwamphamvu kwa kutentha kwamphamvu.

6.Oxidation Resistance

Graphite imayamba kukhala oxidize bwino mumlengalenga pamwamba pa 400-500 ° C. Popeza mbali ya mbali ya electrode imayang'aniridwa ndi ng'anjo yamoto, makutidwe ndi okosijeni ndizomwe zimagwiritsidwa ntchito mosalekeza. Opanga amachepetsa makutidwe ndi okosijeni kudzera mu kachulukidwe, zokutira pamwamba, ma elekitirodi oziziritsidwa ndi madzi ndi chitetezo cha inert-gasi pang'anjo.

7. Phulusa (%)

Phulusa ndi zotsalira zopanda mpweya zomwe zimatsalira pambuyo poyaka. Phulusa lochepa (<0,3% kwa magiredi apamwamba) ndilofunika chifukwa zonyansa za phulusa zimachepetsa madulidwe, zimawonjezera makutidwe ndi okosijeni ndipo zimatha kuipitsa kusamba kwachitsulo.

Zindikirani: Awa ndi masinthidwe amakampani, osati mwatsatanetsatane. Nthawi zonse funsani satifiketi yowunikira ya wopanga pagulu lenileni lomwe mwagula.

Magiredi a Electrode: RP vs. HP vs. UHP

Maelekitirodi a graphite amagawidwa m'makalasi atatu akuluakulu kutengera zinthu zopangira komanso kachulukidwe kake kovomerezeka. Kusankha giredi yoyenera kumakhudza mwachindunji kupanga kwa ng'anjo, kugwiritsa ntchito ma elekitirodi ndi mtengo wathunthu pa tani yachitsulo.

1. Mphamvu Zanthawi Zonse (RP)

Ma elekitirodi a RP amapangidwa makamaka kuchokera ku mafuta a petroleum coke ndipo amalola kachulukidwe otsika kwambiri (nthawi zambiri mpaka 17-24 A/cm²). Ndiwo njira yotsika mtengo kwambiri ndipo ndi yoyenera kwa ng'anjo zing'onozing'ono, zogwiritsira ntchito mphamvu zochepa, ndi ntchito zosafunikira kwenikweni. Ma elekitirodi a RP nthawi zambiri amaperekedwa m'mimba mwake kuyambira 75 mm mpaka 500 mm.

2. Mphamvu Yapamwamba (HP)

Ma elekitirodi a HP amagwiritsa ntchito kusakaniza kwa petroleum coke ndi singano coke, kulola kuti kachulukidwe kakali pano (pafupifupi 18–25 A/cm²). Amapereka mphamvu yochepetsera komanso kukana kutenthedwa kwa kutentha kuposa RP, kuwapangitsa kukhala oyenera ng'anjo zapakatikati ndi zazikulu zomwe zimafunikira zokolola zambiri. Ma diameter odziwika amachokera ku 200 mm mpaka 600 mm.

3.Ultra High Power (UHP)

Maelekitirodi a UHP amapangidwa kuchokera ku singano yamtengo wapatali ya coke ndipo amayimira pamwamba pamtunda, kuthandizira kachulukidwe kamakono ka 20-30 A/cm² ndi pamwamba. Amapereka mphamvu yochepetsetsa kwambiri, kachulukidwe kakang'ono kwambiri komanso kukana kwa okosijeni kwabwino kwambiri, ndipo ndizofunikira pang'anjo zazikulu zamakono za UHP (mphamvu ya matani 100+) komwe moyo wa electrode pa tani yachitsulo ndi yofunika kwambiri. Ma electrode a UHP nthawi zambiri amaperekedwa m'mimba mwake kuchokera 300 mm mpaka 800 mm.

Ntchito Zamakampani a Graphite Electrodes

1.Electric Arc Furnace (EAF) Kupanga Zitsulo - ntchito yaikulu

Kupanga zitsulo za EAF ndizomwe zimapangitsa kuti ma electrode ambiri azigwiritsa ntchito padziko lonse lapansi. Mu EAF, maelekitirodi atatu amadutsa padenga la ng'anjo ndikugunda arc pamtengo wotsalira. Arc imapanga kutentha pamwamba pa 3,000 ° C, kusungunula zinyalala, zomwe kenako zimayengedwa kukhala zitsulo.

Pomwe msika wapadziko lonse wazitsulo ukusintha kuchoka panjira zowombetsa moto kupita kukupanga mpweya wochepa wa EAF, kufunikira kwa ma elekitirodi apamwamba kwambiri a UHP kukukulirakulira. Ma EAF amakono nawonso akuchulukirachulukira "UHP" - akugwira ntchito pamagetsi apamwamba kwambiri - zomwe zimapangitsa kuti pakhale zofunikira kwambiri pakukana kutenthedwa kwa electrode ndi kukana kwa okosijeni.

2.Ladle Furnace (LF) Kuyeretsa

Pambuyo pa kusungunuka koyambirira, chitsulo chosungunula nthawi zambiri chimasamutsidwa ku ng'anjo ya ladle kuti chiyeretsedwe chachiwiri - kusintha chemistry, kutentha ndi inclusions musanayambe kuponyera. Ng'anjo za ladle zimagwiritsa ntchito ma elekitirodi a graphite kutenthetsanso ndikusunga chitsulo pa kutentha kwake. Chifukwa ng'anjo za ladle zimagwira ntchito ndi mphamvu zochepa komanso zazifupi kuposa ng'anjo zosungunuka, kugwiritsa ntchito ma elekitirodi pa tani imodzi ndikotsika, koma maelekitirodi okhazikika, odalirika akadali ofunikira pakuwongolera kutentha.

3.Submerged Arc Furnaces (SAF) - ferroalloys & non-ferrous zitsulo

Mng'anjo za arc pansi pamadzi zimapanga ferroalloys (ferrosilicon, ferrochrome, ferromanganese), chitsulo cha silicon, phosphorous, ndi zinthu zina zopanda ferrous. Apa maelekitirodi amamizidwa m'malipiro, ndipo panopa amadutsa mtolo kuti apange kutentha ndi kukana. Ng'anjozi zimatha kugwiritsa ntchito maelekitirodi a graphite kapena, mochulukira, maelekitirodi akulu akulu akulu kuti azigwira ntchito mosalekeza pakampeni zazitali.

4.Mapulogalamu Ena

• Kusungunuka kwamagetsi kwa ores - kwa titaniyamu slag, calcium carbide ndi njira zina zotentha kwambiri zazitsulo.
• DC magetsi arc ng'anjo - gawo lomwe likukulirakulira komwe electrode imodzi yayikulu (cathode) kuphatikiza anode yapansi imagwiritsidwa ntchito.
• Specialty & ng'anjo kafukufuku - kukana kutenthetsa zinthu ndi zigawo za ng'anjo zotentha kwambiri zama laboratories ndi kupanga mwapadera.

Momwe Mungasankhire Bwino Graphite Electrode

Kusankha ma elekitirodi olondola ndi kulinganiza kwa magawo a ng'anjo, machitidwe ogwirira ntchito ndi mtengo wathunthu wa umwini. Gwirani ntchito izi:

1. Dziwani zambiri zamakono & mphamvu - Kuchokera pamlingo wa thiransifoma wang'anjo ndi machitidwe ogwirira ntchito, werengerani kuchuluka kwazomwe gawo lililonse la electrode lidzanyamula.
2. Fananizani kachulukidwe kakali pano ndi kalasi - Sankhani giredi (RP/HP/UHP) yomwe kachulukidwe kake kovomerezeka kumakwirira nsonga zanu zam'mphepete mwachitetezo.
3. Sankhani diameter - Ma diameter okulirapo amanyamula zambiri zamakono komanso oxidize mocheperako (chiwerengero chapamwamba cha malo ndi voliyumu), koma chikuyenera kukwanira padenga la ng'anjo yanu, chosungira / clamp ndi hydraulic system.
4. Tchulani nsonga ya mawere (yolumikizana) - Mbere ndi gawo lomwe limalephera kwambiri. Onetsetsani kuti zinthu za nipple, mawonekedwe a ulusi ndi ma torque akugwirizana ndi ma elekitirodi ndi zida zomangira za mbewu yanu.
5. Ganizirani gawo lonse la electrode - Magawo apansi amawona arc ndi oxidation apamwamba kwambiri; pamwamba zigawo makamaka kuchita zamakono. Zomera zina zimakongoletsedwa pogwiritsa ntchito magiredi osiyanasiyana kapena zokutira pamzerewu.
6. Tsimikizirani ndi ziphaso - Funsani satifiketi yowunikira yomwe ikuwonetsa kachulukidwe, resistivity, flexural mphamvu, CTE ndi phulusa la batch yeniyeni.

Zomwe Zimayendetsa Kugwiritsa Ntchito Ma Electrode?

Kugwiritsa ntchito ma elekitirodi nthawi zambiri kumawonetsedwa mu kilogalamu pa tani imodzi yazitsulo zopangidwa (kg/t). Kumvetsetsa njira zazikulu zotayika kumakuthandizani kuti muyimitse ogulitsa ndikuchepetsa mtengo:

• Malangizo (arc) kugwiritsa ntchito - Kutsika ndi kuphulika pansonga ya arc pansi pa kutentha kwakukulu. Ichi ndi gawo lalikulu kwambiri komanso losapeŵeka.
• Mbali makutidwe ndi okosijeni - Zomwe zimachitikira kumbali yotentha ndi mpweya wa ng'anjo. Kuwongoleredwa ndi madzi ozizira, zokutira ndi kutchingira.
• Kusweka - Kusweka kwa mawotchi kapena kutentha kwa nsonga kapena thupi, nthawi zambiri kuchokera kuphanga, kusalumikizana bwino kapena kulimbitsa mafupa. Zotetezedwa kwambiri pochita bwino.
• Kutayika kwa stub - The otsala "stub" pamene ndime elekitirodi ayenera m'malo pamaso mowa mokwanira. Kuchepetsedwa pakukhathamiritsa kutalika kwa magawo ndi nthawi yosinthira.

Zomwe zimagwiritsidwa ntchito nthawi zonse zimayambira pafupifupi 1.2–2.5kg/t kwa ng'anjo zamakono za UHP kumtengo wapamwamba wa ma elekitirodi a RP ndi ng'anjo zing'onozing'ono. Kuchepetsa kulikonse kwa 0.1 kg/t ndikopulumutsa mwachindunji pamtengo wokwera kwambiri - chifukwa chake mtundu wa ma elekitirodi ndi kusankha kolondola kumafunika kwambiri.

Gwero Ma Electrodes Apamwamba Apamwamba a Graphite kuchokera kwa Katswiri Wopanga

Kusankha giredi yoyenera ya elekitirodi, m'mimba mwake ndi kasinthidwe ka nipple kumakhudza mwachindunji kusungunuka kwanu komanso mtengo wake patani iliyonse yachitsulo. Monga akatswiri opanga ma elekitirodi a graphite komanso ogulitsa, timapereka ma elekitirodi a RP, HP ndi UHP m'mimba mwake kuchokera pa 75 mm mpaka 800 mm, okhala ndi ziphaso zowunikira komanso chithandizo chaukadaulo pakuyesa ng'anjo.

UzaniZhen An mtundu wanu wa ng'anjo, mphamvu ya thiransifoma ndi zofunikira zamakono, ndipo tikupangira malingaliro oyenera okhala ndi mawu ampikisano.