Yuav ua li cas xaiv refractory cib hauv ob sab phlu rau qhov sib txawv ntawm qhov cub tawg

Lub qhov cub tawg tam sim no yog cov khoom siv smelting tseem ceeb. Nws muaj cov yam ntxwv ntawm kev noj qab haus huv pej xeem yooj yim thiab muaj peev xwm ntau lawm. Refractory cib hauv ob sab phlu plays lub luag hauj lwm indelible nyob rau hauv lub moj tej tawg rauv, tab sis lub refractory cib hauv ob sab phlu ntawm lub cub tawg yog cuam tshuam los ntawm ntau yam thaum lub sij hawm ntau lawm txheej txheem. Nws yog maj mam eroded. Yog li ntawd, txhawm rau txhawm rau txuas lub neej kev pab cuam ntawm lub qhov cub tawg, nws yog ib qho tsim nyog yuav tau yuav cov pob zeb refractory cib kom tsim nyog. Cov txheej txheem ntawm kev xaiv refractory cib linings rau txhua feem yog:

(1) Rauv caj pas. Feem ntau dais qhov cuam tshuam thiab kev puas tsuaj ntawm tib neeg cov nqi, feem ntau steel cib lossis dej txias steel cib yog siv.

(2) Sab saum toj ntawm qhov cub. Qhov no yog thaj chaw uas cov pa roj carbon evolution tshwm sim 2CO2-CO + C nquag tshwm sim, thiab kev yaig ntawm alkali hlau thiab zinc vapor kuj tshwm sim hauv cheeb tsam no. Tsis tas li ntawd, kev yaig thiab hnav ntawm tus nqi poob thiab nce roj ntws yog li ntawd, cov khoom siv refractory nrog cov tshuaj tiv thaiv zoo thiab hnav tsis kam yuav tsum raug xaiv. Qhov zoo tshaj plaws yog high-density m earth bricks, high-density third-class alumina bricks los yog phosphoric acid-impregnated av nplaum cib. Niaj hnub nimno loj blast furnaces siv cov phab ntsa nyias. Hauv cov qauv, 1 ~ 3 ntu ntawm qhov rov qab buckle txias stave feem ntau yog siv los hloov cov cib hauv ob sab phlu.

(3) Qhov nruab nrab thiab qis ntawm qhov cub lub cev thiab lub duav ntawm lub qhov cub. Lub ntsiab mechanism ntawm kev puas tsuaj yog thermal shock spalling, kub kub gas yaig, cov teebmeem ntawm alkali hlau, zinc thiab carbon evolution, thiab cov tshuaj erosion ntawm thawj slag. Lub cib hauv ob sab phlu yuav tsum tau xaiv rau thermal shock kuj thiab kuj Initial slag yaig thiab anti-scoouring refractory cov ntaub ntawv. Tam sim no lub tshuab hluav taws xob loj loj hauv tsev thiab txawv teb chaws xaiv qhov kev ua tau zoo tab sis kim silicon carbide cib (silicon nitride bonding, kev sib txuas tus kheej, Sialon bonding) kom ua tiav lub neej ntawm ntau tshaj 8 xyoo. Kev xyaum tau ua pov thawj tias, Txawm li cas los xij, txawm tias cov khoom siv refractory zoo npaum li cas, nws yuav raug eroded, thiab nws yuav ruaj khov thaum nws nce mus txog qhov sib npaug (li ib nrab ntawm qhov qub thickness). Lub sijhawm no yog kwv yees li 3 xyoos. Qhov tseeb, kev siv hluav taws xob raug rho tawm haujlwm aluminium carbon cib nrog kev ua tau zoo (tus nqi pheej yig) Ntau), lub hom phiaj no kuj tuaj yeem ua tiav. Yog li ntawd, aluminium-carbon cib tuaj yeem siv rau hauv qhov cub tawg ntawm 1000m3 thiab hauv qab no.

(4) Rauv. Lub ntsiab yog vim li cas rau kev puas tsuaj yog erosion ntawm high-temperature gas thiab erosion ntawm slag hlau. Cov cua kub ntws hauv qhov no muaj zog heev, thiab cov khoom siv refractory tsis tuaj yeem tiv taus cov khoom siv ntev. Lub neej ntawm cov khoom siv refractory nyob rau hauv qhov no tsis ntev (ntev 1 ~ 2 lub hlis, luv 2 ~ 3 lub lis piam), feem ntau siv cov ntaub ntawv refractory nrog siab refractoriness, siab load softening kub thiab siab ntim ceev, xws li siab alumina bricks, txhuas. carbon bricks, thiab lwm yam.

(5) Hearth tuyere cheeb tsam. Qhov chaw no tsuas yog thaj chaw nyob hauv qhov cub tawg qhov twg cov tshuaj tiv thaiv oxidation tshwm sim. Qhov kub siab tuaj yeem ncav cuag 1900 ~ 2400 ℃. Lub cib hauv ob sab phlu yog puas los ntawm thermal kev nyuaj siab tshwm sim los ntawm kev kub siab, nrog rau kub kub gas yaig thiab slag hlau yaig. Alkali hlau yaig, scouring ntawm circulating coke, thiab lwm yam. Niaj hnub nimno blast furnaces siv cov cib ua ke los tsim lub hearth cua hnub cheeb tsam, ua los ntawm high aluminium, corundum mullite, xim av corundum thiab silicon nitride ua ke nrog silicon carbide, thiab lwm yam., uas kuj pab tau. Kub pressed carbon thaiv.

(6) Qhov qis ntawm lub hearth thiab hauv qab ntawm lub hearth. Nyob rau hauv cov cheeb tsam uas lub hauv ob sab phlu ntawm lub qhov cub tawg yog heev corroded, lub degree ntawm corrosion yeej ib txwm yog lub hauv paus rau kev txiav txim lub neej ntawm thawj tiam ntawm blast furnaces. Vim tias tsis muaj cua txias nyob rau hauv lub cub tawg thaum ntxov, feem ntau ntawm cov khoom siv ceramic refractory tau siv, yog li thermal stress Cracks nyob rau hauv lub masonry, molten hlau infiltration rau hauv seam thiab floating ntawm lub cub tawg hauv qab cib yog lub ntsiab yog vim li cas rau kev puas tsuaj. . Tam sim no qhov zoo ntawm lub cub tawg hauv qab qauv (ceramic khob, staggered tom, thiab lwm yam) thiab txias, nrog rau cov zoo xim av corundum, grey corundum bricks thiab siv cov carbonaceous micropores thiab kub-pressed cib zoo heev rau lub neej ntawm lub moj tej tawg rauv. hauv qab. Txawm li cas los xij, kev nkag mus thiab tawg ntawm cov hlau molten ntawm carbon cib, tshuaj tua kab mob ntawm cov hlau alkali ntawm carbon cib, thiab kev puas tsuaj ntawm carbon cib los ntawm thermal stress, CO2 thiab H2O oxidation ntawm carbon bricks tseem yog ib qho tseem ceeb hem lub neej. qhov cub hauv qab thiab hearth.