Prejudicial hearth tapping (EBT---Eccentric Bottom Tapping) )
1, tapping mouth brick uses brick of high strenth magnesian carbon (C≥20 ％ ) , Al2O3 - SiC - C brick
2, tapping mouth drainage is arenaceous:
A. Magnesian olivine carbon black of ＋ magnesia ＋
B. Magnesian calcic iron sand
New-style tapping technology:
1, CBT (Centre Bottom Tapping of central hearth tapping)
2, OBT (slant a hearth tapping Offcentre Bottom Tapping)
3, RBT (Round Bottom Tapping of bottom tapping means)
4, HOT (the level rotates tapping Horizontal Tapping)
When tapping first furnace pitch 100 open tapping mouth again; Answer furnace before slag be involved in, stop tapping. Steel 10%~15% stays inside furnace normally. Compare with tapping of furnace of groovy electric arc, slant common ground tapping is like next advantages:
(1) groovy tapping is obliquitous 40, and EBT law tapping needs only 100, area of furnace wall water-cooling but Kuang arrives greatly 90% , fireproof material charge reduces 50%;
(2) tapping Liu is short, compact, need 2min only, tapping temperature falls only 30%;
⑶ eases the impact to Bao Bi, the life that include line raises 20%~40%;
⑷ reduces molten steel amount of air sucked in aeration;
(5) smelt time shortens, power consumption and electrode are used up have reduce.
Gain ground as what the fine outside furnace installs M, of foreign instead EBT amount to 40% , it is easy that because the feature of EBT is to break broken bits,the rate in main furnace achieves 93%◊ , liu enters the oxidizing slag easy control that steel includes, be helpful for steel including reductive fine so, the frit damage that includes line also is reduced. Use prejudicial hearth tapping, $ leaves steel operation to be able to prevent slag Liu be wrapped into steel all right, improve result of the fine outside furnace, with use photograph of tapping chamfer tapping to be as follows than the advantage: The dip of tapping of ⑴ prejudicial hearth reduces length of 20°~30'(2) short net to shorten 2m is helpful for raising input result _;(3) to shorten because tapping time; shortens tapping Liu Cheng and decrease medicinal powder Liu, reduce oxidation 2 times; (4) tapping Wen Jiang, decrease 30 die 20~25kW*h/t of;(5) section report.
EBT tapping, because take steel,left broken bits operation to improve fine result. Because oxidisability slag has the following and adverse factor to fine: (1) reduces effect of deoxidization, to decoke, increase deoxidizer to use up;(2) to reduce alloy to close so that lead, when making chemical composition does not stabilize;(3) to be handled in vacuum, easy cause spill residue phenomenon to lower the life that include line.
When steel-making electric stove uses firebrick construction, its apply working job to should undertake according to the following standard:
Hearth should the fault seams dry build by laying bricks or stones, firebrick brick seams the fireproof pink with corresponding cram of a person operating from within in coordination with outside forces. On, of lower level brick fore-and-aft long seam should crisscross 30° ? 60° .
The hearth of dc arc furnace should not leave those who set level, perpendicular direction to expand seam. Other position should stay by the regulation set expand seam.
Hearth form electrode is installed should perpendicular, should its completely tall perpendicular tolerance is 0? 1mm.
Form electrode is outer the brick of screen brick seams ply to should not exceed 0.5mm. Between two screen brick stick receive an agent to answer daub is even, on, brick of lower level screen should be united in wedlock cheek by jowl.
Screen brick and should be united in wedlock cheek by jowl between form electrode.
Hearth cathode is pounded dozen should raise a standard. With brick of form electrode screen contacts place to answer careful construction, place of screen brick groove is fireproof pound dozen of makings to answer close-grained, joint should close together. Fireproof the construction that pounds dozen of makings should press GB 50211-2014 the 4.5th regulation is carried out.
Taphole Kong Zhuanying and build by laying bricks or stones of synchronism of ringer of broken bits aperture are built. Should stay by design regulation between taphole aperture brick and ringer brick set space. Wait for hearth job layer to pound dozen after ending, application is fireproof pound clearance cram dozen of makings solid.
Taphole aperture wall should maintain level, annulus seams ply to should not exceed 1mm.
Layer of part of one's job of stuff of dry type of hearth job layer is pounded dozen, spread makings ply to should not exceed 200mm every time. Example of the application in disturbing dozen of process controls furnace form.
Tapping mouth careful build by laying bricks or stones is built and should pound dozen, should accord with design angle.
When build by laying bricks or stones builds furnace lid, furnace lid encircles Ying Fangping. Furnace lid brick should the fault seams build by laying bricks or stones to build, the firebrick all around should rely on to tighten furnace decorative cover.
Roof is used fireproof and pouring when makings prefabricated component, is the code of prefabricated component put, remove condole, swing and build by laying bricks or stones to build should press GB 50211-2014 the 4.3.14th? The 4.3.18th regulation is carried out.
Electrode mouth and the body of build by laying bricks or stones all round its should machine build by laying bricks or stones carefully to build, the diameter that electrode mouth brick encircles should accord with design regulation. The tolerance that is apart from between center of each electrode mouth should be ±5mm0
Does boiler setting add up to door brick to answer is build by laying bricks or stones built in broken bits mouth two side 1m? Inside 2m limits, on, does lower level add up to door brick to should stagger 4? 5 bricks. The width of brick closing the door after treatment should not be less than the 2/3 that Yuan Zhuankuan spends.
When using makings doing type to make hearth job layer, pound 1mm of the application after be being hit? The armor plate cover with thick 2mm is protected.
(3) is in in crystallizer in purify steel be mingled with, stimulative form nucleus, crystallize equably.
Commonly used and fireproof material has electric stove: Frit of tall aluminous brick, report combines brick of magnesia brick, magnesian carbon, magnesium pounds dozen of makings character, magnesia brick, magnesian chromic brick.
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