In steel-making production on the rails, written guarantee Leng Gang's circumstance happens from time to tome inside steel bag. May accentuate when line of fine in use thermal conductivity build by laying bricks or stones of tall aluminous brick this kind of phenomenon, the meeting inside bag of together with steel drops because of molten steel temperature, still can bring liner surface to stick the problem with serious broken bits.
Xi Zhengming had determined steel wraps tall aluminous liner, the molten steel heat inside 2h loss, the hot loss that because broken bits surface comes loose,heat causes 29% ; Come loose from crust through liner the hot loss that hot side causes 24% ; The hot loss that causes because of liner accumulation of heat 47% .
Heat preservation uses fireproof data
1, roof ministry adds heat preservation to build
The destination that adds heat preservation lid is the heat loss due to radiation that reduces broken bits range, can improve be able to bear or endure the use condition that flakes the Al2O3-SiO2 with poorer sex fastens expensive aluminous simple fireproof stuff, steel of 250t of the 2nd steelworks wraps Fuzhou, use heat preservation is built (the tall aluminous heat-insulating material of Al2O362% ) hind, improved heat loss due to radiation effectively, reduced molten steel Wen Jiang 14 ℃ .
Steel wraps a lid to use the fiber that contain zirconium to combine an adiabatic result after:
1) molten steel Wen Jiangping all reduces 0.54 ℃ / Min, build time effectively to be 35min, wen Jiang reduces 18.9 ℃ .
2) steel bag lid uses the fiber that contain zirconium after assorted piece, working surface temperature builds outside temperature to be 45~50 ℃ for bag of 800~1050 ℃ steel, lid weight is former pouring the 40%50% of makings liner, life by original 3~5 month, raise above.
2, finery liner adds thermal insulation
The action that thermal insulation adds between the intermediate layer by Bao Bi, bag and bucket carapace is as follows:
Steel wraps the heat insolation of mural liner, can reduce this wall to all round the space comes loose hot, make loss of molten steel total quantity of heat decreases 5% , 1h criterion effect stays inside steel bag when molten steel more apparent, the liner that wrap a wall is adiabatic, reduce bucket carapace temperature to make an appointment with 60 ℃ , the effect that sticks broken bits and knot cold steel to rise to improvement is big. The heat-insulating material of this liner should be satisfied in using, be not crushed, not contractive, have adiabatic effect, its quality asks: Al2O3>60% ; Compression intensity > 10MPa; The heavy change that burn a line (1300 ℃ , 2h) ≤ - 2% .
As high-grade do not bake bricks to expect with indeterminate form dosage increases, because mix into adds black lead, SiC,wait or increase because of bulk density, cause material thermal conductance tall, conduct heat fast, the Wen Jiang in using is more, must use thermal insulation, what its material basically has bulk density to be 1.9g/cm3 about is fireproof and pouring makings and felt of tall aluminous fireproof fiber. Go up in steel bag carapace when construction first build by laying bricks or stones piece brick, irrigate next fireproof and pouring makings or felt of the fiber that stick a shop, build by laying bricks or stones is built after or irrigate steel contract for a job makes line.
In addition, use steel to wrap warm-up, heat preservation to heat up have enough to meet need, shrinkage fitting heat is used, maintain the operation that heat up voice to wait to have certain effect.
3, heat-insulation layer of liner of bag of steel of Pan Gang 160t used fireproof fiber heat insolation to cover with tiles
Fireproof fiber heat insolation is made of baked clay, by fireproof fiber, inorganic filling and inorganic bond are made, its chemistry composition is Al2O3 35% , siO2 61.5% .
After Lian Zhu uses bag of steel of line of the brick that contain carbon to join fiber heat insolation to cover with tiles, temperature of the wall outside steel bag from former rice average 295 ℃ fall to 224 ℃ , reduced 71 ℃ ; Molten steel Wen Jiang reduces 0.3 ℃ / Min, tapping leaves to Lian Zhu irrigate need 60min about, molten steel Wen Jiang reduces 18 ℃ .
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