Ib qho EAF khiav ntawm kev siv hluav taws xob ntau dua li yuav luag txhua lub tshuab hluav taws xob. Cov hluav taws xob arc tsim qhov kub siab tshaj 3000℃ntawm lub taub electrode. Cov hlau da dej nruab nrab yog 1600-1650 degree. Kev sib xyaw ua ke ntawm cov hlau molten, kua slag, thermal cycling, arc hluav taws xob, thiab lub cev cuam tshuam los ntawm cov khoom siv ua rau EAF refractory xaiv ib qho ntawm cov teeb meem xav tau tshaj plaws hauv steelmaking.
Qhov yuam kev feem ntau cov neeg yuav khoom ua: kho EAF ua ib cheeb tsam thiab qhia ib qho khoom thoob plaws. Qhov no yog li cas koj tau txais ib lub hauv ob sab phlu uas ua tsis tau thawj zaug nyob rau hauv lub slag cheeb tsam nyob rau hauv 8 lub lis piam thaum lub hauv qab yog tseem zoo kawg nkaus pab.
Phau ntawv qhia no qhia txog txhua cheeb tsam EAF, piav qhia txog qhov tsis ua haujlwm hauv cheeb tsam ntawd, thiab muab cov khoom tshwj xeeb uas hais txog nws. Rau cov lus qhia dav dav ntawm tsev neeg refractory yooj yim siv thoob plaws hauv kev tsim steel hlau, saib peb phau ntawv qhia txog cov khoom siv magnesia refractory.
EAF Refractory Challenges - Vim li cas EAF Ib puag ncig yog qhov txawv
Ib qho EAF kev khiav hauj lwm ntawm 150 MW cov khoom siv hluav taws xob tsim hluav taws xob tsim cov xwm txheej uas yuav rhuav tshem feem ntau ntawm cov khoom siv hluav taws xob hauv hnub:
Thermal siv:Arc kub ntawm 3000℃+ nrog hluav taws xob ncaj qha mus rau lub ru tsev thiab sab sauv sab. Kub gradients los ntawm cheeb tsam electrode mus rau steel da dej: 1000℃nyob rau hauv 500mm ntawm ob sab thickness.
Tshuaj tua kab mob:Basicity of 3–4 (CaO/SiO₂ ratio). FeO cov ntsiab lus hauv EAF slag nce mus txog 15-25%, siab dua BOF slag. FeO tshwj xeeb yog nruj heev rau MgO-C cib - nws oxidizes cov pa roj carbon theem, tsim porosity uas accelerates slag nkag.
Thermal cycling:Txhua qhov cua sov yog tag nrho lub voj voog los ntawm kev pib txias rau 1700℃thiab rov qab. Rau lub khw muag khoom yaj uas khiav 30 cua sov ib hnub twg, hauv ob sab phlu muaj 30 tag nrho thermal cycles ib hnub twg. Thermal shock yog thawj hom tsis ua haujlwm rau lub ru tsev cib thiab cov phab ntsa sab saud.
Mechanical impact:Cov khib nyiab them nrog cov hlau loj loj ua rau lub cev cuam tshuam ncaj qha rau ntawm phab ntsa. Qhov no yog vim li cas thaj tsam cuam tshuam (qhov chaw seem ntog) tau txais cov tuab, siab tshaj-CCS hauv ob sab phlu.
Ib qho EAF nyob rau sab hnub tuaj Asia tau hloov lawv cov phab ntsa sab hauv txhua 3 lub hlis (kwv yees li 250 qhov cua sov). Tom qab peb rov tsim kho lawv thaj chaw tshwj xeeb - tshwj xeeb hloov ntawm 10% C mus rau 15% C MgO-C hauv thaj tsam slag thiab ntxiv cov phiaj xwm kev tua phom - lawv txuas ntxiv lub neej kev sib tw rau 550+ heats ua ntej tag nrho relining.
EAF Zone Daim Ntawv Qhia - Kev Ua Haujlwm Tsis Ua Haujlwm los ntawm Txoj Haujlwm
| Zone | Kub | Hom Kev Ua Haujlwm Tseem Ceeb | Khoom siv pom zoo |
|---|---|---|---|
| Hauv qab (hauv qab steel da dej) | 1600-1700 degree | Erosion los ntawm molten steel + thermal qaug zog | Rammed MgO + MgO-C kev nyab xeeb hauv ob sab phlu |
| Slag kab | 1600-1750 degree | FeO slag nres + carbon oxidation | MgO-C cib, 14–18% C, FM-97 nplej |
| Sab laug sab | 1500-1650 degree | Slag nres + cuam tshuam | MgO-C cib, 12-15% C |
| Upper phab ntsa | 1400-1600 degree | Arc hluav taws xob + thermal cycling | High alumina cib los yog alumina-chrome |
| Rooj | 1400-1600 degree | Arc hluav taws xob + roj nres + thermal shock | High alumina (90%) los yog dej-txias panels |
| Kais qhov chaw | 1600-1700 degree | Molten steel erosion + thermal shock | Alumina-MgO castable lossis tshwj xeeb cib |
Hauv qab thiab Hearth: Rammed MgO vs. Castable
EAF hauv qab feem ntau yog tsim nyob rau hauv ob txheej:
Kev nyab xeeb / thaub qab hauv ob sab phlu:MgO-C cib (8-10% C) lossis ntom nti MgO cib. Cov txheej no tseem nyob hauv qhov chaw rau ntau qhov kev sib tw - nws tsis hloov txhua qhov cua sov. Thickness: 200-300 hli.
Txheej txheej ua haujlwm:Sintered MgO rammed huab hwm coj los yog MgO-raws li castable, thov nyob rau sab saum toj ntawm txoj kev nyab xeeb. Lub rammed loj yog hloov los yog ntxiv ntau zaus.
Vim li cas rammed loj rau lub hearth?Qhov saum npoo hauv qab tsis yog lub dav hlau tiaj tus - nws muaj qhov tsis sib xws ntawm cov cua sov dhau los thiab cov qauv yaig. Rammed huab hwm coj conforms rau saum npoo thiab sau irregularities. Cov chav kawm cib tsis hloov mus rau qhov geometry no.
MgO cov ntsiab lus rau hearth rammed pawg:Yam tsawg kawg nkaus 90% MgO, nplej loj faib kom ua tiav qhov ntim siab tshaj plaws. Coarse/medium/fine ratio: 40/30/30% los ntawm qhov hnyav.
Daim ntawv thov:Thov nyob rau hauv 50-80mm nqa, tamp txhua nqa manually lossis nrog pneumatic rammer. Lub hom phiaj ceev Ntau dua lossis sib npaug li 2.95 g / cm³ tom qab tamping. Tseem ceeb: thawj lub tshav kub tom qab kho lub hearth yuav tsum ua raws li lub sij hawm tswj cov cua sov kom sinter lub rammed loj nyob rau hauv qhov chaw.
Khoom siv compatibility ceeb toom:High alumina castable tuaj yeem ua haujlwm ruaj khov / ruaj ntseg txheej, tab sis yeej tsis ua haujlwm li hauv ob sab phlu hauv kev sib cuag steel. Ntawm 1650 degree, alumina siab tso tawm SiO₂ rau hauv da dej, ua rau silicon khaws thiab degrading yooj yim slag compatibility. Sintered MgO rammed pawg tseem tsis tuaj yeem sib tham rau cov hlau huv huv.
Slag Zone (Lower Sidewall): Vim li cas MgO-C Qib Matters
Lub slag cheeb tsam - kwv yees li 400-600mm band qhov twg cov slag txheej hu rau sidewall - yog qhov ceev tshaj plaws-hnav cheeb tsam nyob rau hauv tej EAF. Kev sib xyaw ua ke ntawm high-FeO slag, arc turbulence, thiab thermal cycling tsim ib qho chaw zoo meej yaig, qhov twg hwmMagnesia carbon cibua tus thawj tiv thaiv.
Kev xaiv cov ntsiab lus carbon:
14-18% C: Cov ntsiab lus carbon siab tshaj plaws, siab tshaj thermal conductivity, siab tshaj plaws khov slag txheej tiv thaiv. Siv rau high-FeO slag ib puag ncig (khoom-raws li EAF nrog 15-20% FeO hauv slag). Frozen slag txheej ntawm cib ntsej muag zoo armor-phaj lub hauv ob sab phlu ntawm cov kais dej.
12–14% C: Rau DRI (txuas ncaj qha hlau) tsub qhov twg FeO qis dua thiab cov pa roj carbon pickup hauv ultra-low-carbon steel qib yuav tsum raug txo kom tsawg.
10-12% C: Rau stainless hlau EAF qhov twg carbon contamination yog ib qho tseem ceeb.
Raw khoom zoo:FM-97 grain yog cov specification rau slag cheeb tsam cib. Using DBM-95 to reduce cost in the slag zone is a false economy - the lower bulk density and smaller crystal size of DBM allows faster FeO penetration.
Antioxidant ntxiv:Tag nrho peb cov slag cheeb tsam MgO-C cib suav nrog Al lossis Al-Mg alloy antioxidant (2-4% ntxiv) rau retard carbon oxidation. Qhov no yog tus qauv kev coj ua - ib qho MgO-C cib tsis muaj tshuaj tua kab mob tsis txaus rau EAF slag kab kev pabcuam.
Upper Sidewall: High Alumina vs. Alumina-Chrome Options
Sab saum toj sidewall ua haujlwm saum cov kab slag. Qhov ntsuas kub qis dua (1400-1550 degree) tab sis qhov chaw ib puag ncig txawv: cov pa hluav taws xob kub, hluav taws xob arc, thiab plua plav / fume condensation es tsis yog kev sib cuag ncaj qha.
High alumina cib (85-90% Al₂O₃):Standard xaiv rau sab saum toj sidewall. Tsim nyog rau kev siv nruab nrab-kev siv EAF. CCS Ntau dua lossis sib npaug rau 80 MPa, RUL T₀.₅ Ntau dua lossis sib npaug rau 1550℃. Tus nqi zoo (saib xyuas peb cov txheej txheem kev ua haujlwm ntawmsiab alumina cib khoom).
Alumina-chrome cib (70-80% Al₂O₃, 8-15% Cr₂O₃):Kev xaiv hwm rau kev siv siab EAF nrog cov txheej txheem nruj heev. Cr₂O₃ ntxiv tau txhim khu kev tiv thaiv rau hlau oxide fume condensation thiab alkali vapor nres. Kev sib tw lub neej feem ntau yog 30-50% ntev dua li tus qauv siab alumina nyob rau sab saum toj txoj haujlwm.
Environmental note on Cr₂O₃:Siv cib los ntawm alumina-chrome linings muaj hexavalent chromium (Cr⁶) tom qab kev pab cuam - yuav tsum tau tshwj xeeb pov tseg rau ib cheeb tsam. Paub meej tias cov kev cai pov tseg hauv zos ua ntej qhia.
Thickness:Upper sidewall feem ntau 150-200mm. Rau kev ua haujlwm siab, 230mm nrog lub ntsej muag kub tshuaj tsuag-ntawm kev tua phom.
Ru tsev: Cov khoom xaiv rau Arc Radiation thiab Gas Attack
EAF lub ru tsev siv lub txim tshaj plaws los ntawm arc hluav taws xob. Ob txoj kev tsim qauv tseem ceeb:
Delta ru tsev (cib siv):Siv lub siab alumina cib (90% + Al₂O₃) los yog magnesia-chrome cib teem rau hauv ib qho kev ncua. Kev pabcuam kub siab tshaj plaws: 1650 degree. Yuav tsum tau kuaj xyuas ib ntus thiab hloov qhov kub ntawm qhov chaw (qhib ncaj qha hauv qab txoj haujlwm electrode).
Dej-txias vaj huam sib luag ru tsev (ib nrab los yog tag nrho):Niaj hnub nimno high-power EAF designs feem ntau siv dej-txias tooj liab los yog steel panels rau feem ntau ntawm lub ru tsev cheeb tsam, tsuas yog cov electrode delta tshuav li refractory cib. Qhov no ua rau ncua lub ru tsev phiaj xwm lub neej tab sis ua kom cov dej txias zog noj.
Rau lub ru tsev cib, qhia:
High alumina cib, 92-95% Al₂O₃, yam tsawg kawg nkaus CCS 120 MPa
Pom tseeb porosity <15% (dense cib resists fume nkag mus)
Tsim nyog cib geometry rau lub koov tsim - sab laj peb nrog lub ru tsev txoj kab uas hla thiab delta qhov ntev
Phom thiab Patching - Ncua lub neej kev sib tw
Qhov kev pab cuam tua phom zoo yog qhov sib txawv ntawm 300-kub thiab 600-kub phiaj xwm.
Cov khoom siv phom phom:MgO-basedntom phom castable, 85-90% MgO, particle loj optimized rau pneumatic daim ntawv thov.
Thaum yuav phom:Tom qab txhua qhov cua sov lossis txhua 2-3 cua sov, tshuaj xyuas thaj tsam slag thiab qhov cuam tshuam. Phom txhua qhov chaw uas hnav tshaj 20mm los ntawm kev siv profile. Lub hom phiaj: khaws cov hauv ob sab hauv 30-50mm ntawm thawj profile thoob plaws hauv kev sib tw.
Txoj kev thov:
Cov phom ntub dej (nyiam dua): ua ntej sib xyaw nrog dej, thov ntawm 5-8m phom deb
Cov phom qhuav: hmoov + dej ntawm nozzle; xav tau kev tswj dej kom meej rau adhesion
Adhesion tseem ceeb:Lub plhaub ntawm lub cub tawg yuav tsum nyob ntawm 600-900℃thaum tua phom. Hauv qab 600 degree, cov khoom siv phom tsis sinter thiab ntog. Tshaj 1000 degree, nws dries sai heev ua ntej nkag mus rau hauv cov kab nrib pleb uas twb muaj lawm.
Peb cov phom phom castable: MgO Ntau dua lossis sib npaug ntawm 88%, Fe₂O₃ < 1.2%, CCS tom qab 1400℃firing Ntau dua lossis sib npaug li 45 MPa. Tau tshaj ob peb MgO-C cib thiab cov neeg sib tw hom - phom sib xws nyob ntawm chemistry, tsis yog hom.
Kev Sib Tw Lub Neej Benchmarks thiab Optimization
Hom EAF phiaj los nqis tes nyob ntawm kev tsim:
| EAF Hom | Lub neej hauv qab | Sidewall Life (tsis muaj phom) | Nrog Gunning Program |
|---|---|---|---|
| AC EAF, cov khoom qub | 300-500 hli | 250-350 feeb | 500-700 hli |
| DC EAF | 400-600 kub | 300-400 kub | 600-800 kub |
| DRI-fed EAF | 200-350 hli | 200-300 kub | 400-600 kub |
Peb qhov sib txawv uas feem ntau cuam tshuam rau lub neej kev sib tw:
MgO-C cov ntsiab lus carbon (C siab dua C hauv high-FeO slag=ntev dua)
FM vs. DBM grain quality (FM-97 tsis tu ncua outperforms nyob rau hauv slag cheeb tsam)
Cov kev pab cuam phom phom sib xws (patching hauv 24 teev tom qab kuaj pom hnav> 20mm)
Lub sijhawm hloov cov khoom sib txawv thoob plaws cov phiaj xwm:
Sidewalls:250-400 cua sov tsis tu; 500-800 heats nrog txhua hnub kub phom tu.
Hearth hauv qab:Feem ntau muaj sia nyob 2-3 ua tiav kev sib tw sab nrauv (1,200-2,000 heats) ua ntej yuav tsum tau ua kom tiav tag nrho thiab rov ua dua.
Tap lub tes tsho bricks:Teem sijhawm hloov pauv txhua 50-100 qhov cua sov kom tiv thaiv cov kais dej hluav taws xob thiab cov hlau xau.
Kev txiav txim siab ntawm AC thiab DC rauv:DC EAF hauv qab tsim cov khoom siv hluav taws xob MgO lossis graphite-MgO tus pin cib nyob ib puag ncig hauv qab rov qab electrode, xav tau tshwj xeeb thermal expansion xyuas thaum pib.
Kev Sib Tham & Project RFQ
MgO-C cib rau EAF slag cheeb tsam - 14% C thiab 12% C qib hauv Tshuag.
Muab koj lub cub tawg hom (AC / DC), kais hnyav, qib steel, thiab lub neej kev sib tw tam sim no. Peb pab neeg ua haujlwm engineering yuav qhia txog thaj tsam-muab cov pob refractory thiab muab cov lus pom zoo ua tiav.
Email:inquiry@topower.tech- Peb teb hauv 4 teev ua haujlwm.
TDS, COA, thiab batch xeem cov ntaub ntawv los ntawm ntau lawm ntau lawm muaj nyob rau ntawm kev thov.
