CN102899455A - Argon-oxygen furnace and operation method thereof - Google Patents
Argon-oxygen furnace and operation method thereof Download PDFInfo
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- CN102899455A CN102899455A CN2012103322332A CN201210332233A CN102899455A CN 102899455 A CN102899455 A CN 102899455A CN 2012103322332 A CN2012103322332 A CN 2012103322332A CN 201210332233 A CN201210332233 A CN 201210332233A CN 102899455 A CN102899455 A CN 102899455A
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
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Abstract
The invention relates to an argon-oxygen furnace and an operation method thereof. The argon-oxygen furnace is characterized in that: I, the physical and chemical indexes of a magnesium-calcium brick for the working layer of a furnace lining meet requirements; II, a total included angle of blower guns is 108 to 120 DEG, the distance between the blower guns is no less than 380 mm, and the blower guns, blower gun bricks and adjacent bricks are bonded by using resin mortar; and III, the furnace lining undergoes maintenance and baking. The operation method is characterized in that: I, the content of Si in pre-melting liquid of smelting is no more than 0.30%; II, during blowing, the integral argon-oxygen furnace is backwardly revolved and tilted by 3 to 7 DEG; III, air feeding intensity of a top gun during decarburization in stage 1 to 3 is 0.85 to 1.40 Nm<3>/min.t; IV, the basicity of slag is 1.8 to 2.2; V, no-load time is less than 90 min, a furnace mouth is swayed down to 120 to 240 DEG, and if no-load time is greater than 90 min, on-line baking is carried out; and VI, temperature monitoring is carried out on steel plate surface temperature corresponding to easy-leaking points of the blower guns and slag lines in the whole process of furnace smelting. With the argon-oxygen furnace and the operation method thereof in the invention, the furnace life of the argon-oxygen furnace is prolonged to no less than 160 heats.
Description
Technical field
The present invention relates to a kind of argon oxygen stove and working method thereof.
Background technology
Argon oxygen stove has many distinguishing features aspect smelting stainless steel, role is that other metallurgical equipment can't replace in the stainless steel Production Flow Chart.But, argon oxygen stove is when smelting stainless steel, and the reason such as process temperature is high, smelting cycle is long, gas stirring is violent, slag washes away seriously, the temperature of furnace lining periodical change is large causes the furnace lining working conditions abominable, furnace life is on the low side, directly has influence on production capacity, cost and organization of production.Argon/oxygen furnace age is the major issue that stainless steel factory faces, and is all seeking a good solution.Aspect many unfavorable factors, existing operation also has the following disadvantages when the reply argon/oxygen furnace serves as a contrast in smelting:
The first, furnace lining with the magnesia-calcium brick physical and chemical index, build by laying bricks or stones and baking aspect, shaft and air pressure gun are with SiO in the magnesia-calcium brick
2+ Al
2O
3+ Fe
2O
3Sum content is greater than 3%; Air pressure gun is arranged and quantitatively not a preferred plan; Health under the normal temperature (placement) 12h, the time is short; With 7.5h to 600 ℃ of 80 ℃/h heat-up rate intensification, heat-up rate is fast with Sweet natural gas or coal gas.
The second, smelting operation aspect enters in the pre-liquation of stove Si content 50% heat greater than 0.30%, and temperature 60% heat is less than 1480 ℃, and 55% heat band quantity of slag thickness is greater than 50mm, causes in the argon oxygen stove SiO in the slag
2Content raises; Stove parallactic angle degree is 0 degree during blowing, and top rifle air-flow and air pressure gun side wall spacing are minimum; Top rifle and air pressure gun air supply intensity span of control are larger, have surpassed 0.6Nm
3/ min.t; MgO content is at 5-7% in the slag, and is on the low side; Air pressure gun and slag line etc. be leak source surface of steel plate temperature easily, smelts whole process in whole stove labour and does not monitor; The empty stove time shakes fire door to 90 degree downwards within 90min; Greater than then just online baking of 120min, the furnace lining temperature drop is large, easily chilling.Therefore, existing argon oxygen stove and working method thereof, the furnace life of argon oxygen stove is lower, is generally 95-120 time.
Summary of the invention
In order to overcome the above-mentioned deficiency of existing argon oxygen stove, the invention provides higher argon oxygen stove of a kind of furnace life, a kind of working method of this argon oxygen stove is provided simultaneously, the working method of argon oxygen stove provided by the invention, operate at argon oxygen stove of the present invention, the furnace life of argon oxygen stove can be extended to and be not less than 160 heats.
Design of the present invention is:
Control shaft, air pressure gun magnesia-calcium brick physical and chemical index improve the anti-material of working lining damage against corrosion and scouring capability; Building by laying bricks or stones of the control side-blown total angle of air pressure gun and rifle spacing and air pressure gun brick is in case ooze steel between the air pressure gun anti-material erosion aggravation of working lining on every side and air pressure gun and air pressure gun brick; Will be to furnace lining health and baking before reaching the standard grade, prevent that the working lining big area from peeling off; Improve and enter the pre-liquation condition of stove, SiO in the minimizing slag
2Erosion to the basic lining refractory materials; Implement the negative angle blowing of stove position, can increase top rifle air-flow and air pressure gun side wall spacing during blowing; Control top rifle and air pressure gun air supply intensity are conducive to improve decarbonization rate, shorten duration of blast; Control basicity of slag, content of magnesia and process temperature prevent the aggravation of the working lining melting loss of anti-the material; Commute leak source surface of steel plate temperature implementing monitoring in whole stove labour smelting process; Slow down the sky furnace temperature and fall, avoid the furnace lining chilling, cause anti-material to peel off.
Argon oxygen stove of the present invention comprises furnace shell, furnace lining and air pressure gun, furnace shell has fire door, furnace crown, shaft and furnace bottom, the anti-material of contact furnace shell steel plate is permanent layer in the furnace lining, the anti-material of contact permanent layer outer contacting molten steel is working lining in the furnace lining, air pressure gun is installed in restoration of lower stack one side and on same level, outside furnace shell, insert in the stove, it is characterized in that:
IDescribed furnace lining working lining satisfies following requirement with the physical and chemical index of magnesia-calcium brick:
W(CaO)/％ 30-35；
W(MgO)/％ ≥60；
W(SiO
2＋Al
2O
3＋Fe
2O
3)/％ ≤3；
Apparent porosity/%≤16;
Volume density/g/cm
3〉=3.0;
Cold crushing strength/MPa 〉=50.
IITotal angle of described air pressure gun is that the air pressure gun spacing is not less than 380mm between 108 °～120 °, the at most equidistant air pressure gun (being that air pressure gun is distributed between 108 °～120 °) of configuration; Its center line focus was in horizontal plane center, air pressure gun place after all air pressure guns were installed.Bonding with clay between air pressure gun and air pressure gun brick, between air pressure gun brick and adjacent bricks.
Air pressure gun brick masonry method is: before building by laying bricks or stones, in stove, find out the central point of air pressure gun place same level with cotton rope, air pressure gun is equidistantly arranged and every air pressure gun medullary ray focuses on air pressure gun place horizontal plane central point, determines the position of air pressure gun brick, and definite remaining space is built the size of processing brick more afterwards.Bonding with clay between (air pressure gun is by the brick at its center), air pressure gun brick and adjacent bricks between air pressure gun and air pressure gun brick.
IIIAfter described furnace lining all finishes building, through following health and baking:
Buckle closure on the fire door, at normal temperatures health (placement) 24h; With Sweet natural gas or coal gas with 50 ℃ ± 5 ℃/h heat-up rate intensification 12h to being not less than 600 ℃, insulation 4～6h; Be warming up to 1050～1100 ℃ with 80 ℃ ± 5 ℃/h heat-up rate again, insulation 5～8h.The steel-making of reaching the standard grade afterwards.
The working method of this argon oxygen stove is carried out at argon oxygen stove of the present invention, and it comprises following step successively:
IAll smelt steel grade, and Si content is not more than 0.30% in the pre-liquation that smelting is used, and temperature is not less than 1480 ℃, and band quantity of slag thickness is less than 50mm.
IIDuring blowing, argon oxygen stove integral body is revolved backward and is inclined 3 °～7 °.
III1～3 phase of decarburization top rifle air supply intensity is controlled at 0.85～1.40Nm
3/ min.t, the air pressure gun air supply intensity is controlled at 0.75～1.05Nm
3/ min.t.
IVBasicity of slag is controlled at 1.8～2.2; Magnesium ball (MgO addition material) added in (quality of magnesium ball total amount) 25～35%, 35～45%, 25～35% ratios respectively within 1～3 phase of decarburization, and MgO content is controlled at 8～12% in the slag; The smelting process molten steel temperature remains on below 1730 ℃.
VThe empty stove time shakes fire door to 120 °～240 ° downwards less than 90min; Greater than then online baking of 90min.
VITo air pressure gun and surface of steel plate temperature corresponding to the easy leak source of slag line, implement monitoring temperature in whole stove labour smelting process.When the working lining residual thickness to the safety limit point, namely stop refining when 350 ℃～400 ℃ of 400 ℃～450 ℃ of shaft place furnace shell surface of steel plate temperature or furnace bottom place furnace shell surface of steel plate temperature and change furnace lining in the furnace shell.
This argon oxygen stove control working lining magnesia-calcium brick physical and chemical index can improve the anti-material of working lining damage against corrosion and scouring capability; Building by laying bricks or stones of the control side-blown total angle of air pressure gun and rifle spacing and air pressure gun brick alleviates between the air pressure gun anti-material erosion of working lining on every side and air pressure gun and air pressure gun brick and oozes steel; After furnace lining health and the baking, prevent that the working lining big area from peeling off.Carry out working method of the present invention at this argon oxygen stove, improvement enters the pre-liquation condition of stove, reduces SiO in the slag
2Erosion to the basic lining refractory materials; Implement the negative angle blowing of stove position, can increase top rifle air-flow and air pressure gun place side wall spacing during blowing; Control top rifle and air pressure gun air supply intensity are conducive to improve decarbonization rate, shorten duration of blast; Control basicity of slag, content of magnesia and process temperature prevent the aggravation of the working lining melting loss of anti-the material; Commute leak source surface of steel plate temperature implementing monitoring in whole stove labour smelting process; Can slow down the sky furnace temperature by adjustment stove position and fall, the anti-material of avoiding the furnace lining chilling to cause peels off.This argon oxygen furnace operating method is implemented at this argon oxygen stove, argon/oxygen furnace raising in age can be not less than 160 times.Be conducive to improve stainless steel throughput and reduce stainless steel ton steel production cost.
Embodiment
Describe the specific embodiment of the present invention in detail below in conjunction with embodiment, but the specific embodiment of the present invention is not limited to following embodiment.
Argon oxygen stove embodiment one
The present embodiment is 45 tons of argon oxygen stoves that 4 side-blown air pressure guns are housed, it comprises furnace shell, furnace lining and air pressure gun, furnace shell has fire door, furnace crown, shaft and furnace bottom, the anti-material of contact furnace shell steel plate is permanent layer in the furnace lining, the anti-material of contact permanent layer outer contacting molten steel is working lining in the furnace lining, air pressure gun is installed in restoration of lower stack one side and on same level, inserts outside furnace shell in the stove, it is characterized in that:
IThe working lining of furnace lining with the magnesia-calcium brick physical and chemical index is:
W(CaO)/％ 31.2；
W(MgO)/％ 64.5；
W(SiO
2＋Al
2O
3＋Fe
2O
3)/％ 2.6；
Apparent porosity/% 8.2;
Volume density/g/cm
33.02;
Cold crushing strength/MPa 85.1.
IITotal angle of air pressure gun is 117 °, air pressure gun spacing 435mm, and its center line focus was in horizontal plane center, air pressure gun place after 4 side-blown air pressure guns were installed.Air pressure gun brick masonry method is: before building by laying bricks or stones, in stove, find out the central point of air pressure gun place same level with cotton rope, air pressure gun is equidistantly arranged and every air pressure gun medullary ray focuses on air pressure gun place horizontal plane central point, determines the position of air pressure gun brick, and definite remaining space is built the size of processing brick more afterwards.Bonding with clay between (air pressure gun is by the brick at its center), air pressure gun brick and adjacent bricks between air pressure gun and air pressure gun brick.
IIIAfter described furnace lining all finishes building, through following health and baking:
Buckle closure on the fire door, at normal temperatures health (placement) 24h; With 12h to 600 ℃ of 50 ℃/h heat-up rate intensification, be incubated 4.5h with Sweet natural gas; Be warming up to 1100 ℃ with 80 ℃/h heat-up rate again, insulation 6.5h.
(above-mentioned parameter is certain stove labour)
Working method embodiment one
(1 stove labour is produced 203 stove steel, and every stove there are differences in control)
The present embodiment carries out at argon oxygen stove embodiment one, and it comprises following step successively:
ISi content is 0.10% in the employed pre-liquation of argon oxygen stove smelting steel grade, and 1490 ℃ of temperature are with quantity of slag thickness 40mm.
IIDuring blowing, argon oxygen stove integral body is revolved backward and is inclined 5 °.
IIIAir supply intensity:
1 phase of decarburization: top rifle air supply intensity 1.0Nm
3/ min.t; Air pressure gun air supply intensity 0.96Nm
3/ min.t.
2 phases of decarburization: top rifle air supply intensity 0.89Nm
3/ min.t; Air pressure gun air supply intensity 0.96Nm
3/ min.t.
3 phases of decarburization: top rifle air supply intensity 0.89Nm
3/ min.t; Air pressure gun air supply intensity 0.96Nm
3/ min.t.
IVBasicity of slag is controlled at 2.0, and magnesium ball (MgO addition material) added in 35%, 35%, 30% ratio respectively within the decarburization 1-3 phase, and MgO content is controlled at 10% in the slag, and the smelting process molten steel temperature is up to 1729 ℃.
VThe empty stove time shakes fire door to 150 degree, in case chilling downwards less than 90min before smelting.
VITo air pressure gun, the easy leak source surface of steel plate of slag line temperature, in whole stove labour smelting process, implement monitoring temperature, measure furnace bottom place furnace shell surface of steel plate temperature, 300 ℃ of temperature.
On 45 tons of argon oxygen stoves, select furnace lining operational layer material, furnace lining to build by laying bricks or stones, toast from argon oxygen stove, to smelting all by present method operation, this stove is used as a servant furnace life and has been reached 203 times.
Argon oxygen stove embodiment two
The present embodiment is 180 tons of argon oxygen stoves that 9 side-blown air pressure guns are housed, it comprises furnace shell, furnace lining and air pressure gun, furnace shell has fire door, furnace crown, shaft and furnace bottom, the anti-material of contact furnace shell steel plate is permanent layer in the furnace lining, the anti-material of contact permanent layer outer contacting molten steel is working lining in the furnace lining, air pressure gun is installed in restoration of lower stack one side and on same level, inserts outside furnace shell in the stove, it is characterized in that:
IThe working lining of furnace lining with the magnesia-calcium brick physical and chemical index is:
W(CaO)/％ 32.29；
W(MgO)/％ 61.29；
W(SiO
2＋Al
2O
3＋Fe
2O
3)/％ 1.81；
Apparent porosity/% 7.1;
Volume density/g/cm
33.21;
Cold crushing strength/MPa 99.1.
IITotal angle of air pressure gun is 120 °, air pressure gun spacing 443mm, and its center line focus was in horizontal plane center, air pressure gun place after 9 side-blown air pressure guns were installed.Air pressure gun brick masonry method is: before building by laying bricks or stones, in stove, find out the central point of air pressure gun place same level with cotton rope, air pressure gun is equidistantly arranged and every air pressure gun medullary ray focuses on air pressure gun place horizontal plane central point, determines the position of air pressure gun brick, and definite remaining space is built the size of processing brick more afterwards.Bonding with clay between (air pressure gun is by the brick at its center), air pressure gun brick and adjacent bricks between air pressure gun and air pressure gun brick.
IIIAfter furnace lining all finishes building, through following health and baking:
Buckle closure on the fire door, at normal temperatures health (placement) 24h; With 12h to 600 ℃ of 50 ℃/h heat-up rate intensification, be incubated 5h with coal gas; Be warming up to 1100 ℃ with 80 ℃/h heat-up rate again, insulation 8h.The steel-making of reaching the standard grade afterwards.
(above-mentioned parameter is certain stove labour)
Working method embodiment two
The present embodiment carries out at argon oxygen stove embodiment two, and it comprises following step successively:
(1 stove labour is produced 187 stove steel, and every stove there are differences in control)
ISi content is 0.20% in the employed pre-liquation of steel grade of smelting, and 1520 ℃ of temperature are with quantity of slag thickness 30mm.
IIDuring blowing, argon oxygen stove integral body is revolved backward and is inclined 3.5 °.
IIIAir supply intensity:
1 phase of decarburization: top rifle air supply intensity 1.0Nm
3/ min.t; Air pressure gun air supply intensity 0.75Nm
3/ min.t.
2 phases of decarburization: top rifle air supply intensity 1.06Nm
3/ min.t; Air pressure gun air supply intensity 0.75Nm
3/ min.t.
3 phases of decarburization: top rifle air supply intensity 1.23Nm
3/ min.t; Air pressure gun air supply intensity 0.90Nm
3/ min.t.
IVBasicity of slag is controlled at 1.9, and magnesium ball (MgO addition material) added in 35%, 35%, 30% ratio respectively within the decarburization 1-3 phase, and MgO content is controlled at 10.5% in the slag, and the smelting process molten steel temperature is up to 1729 ℃.
VThe empty stove time occurs 1 time greater than 90min, and empty stove time 130min has taked online baking measure, in case chilling.
VITo air pressure gun, the easy leak source surface of steel plate of slag line temperature, in whole stove labour smelting process, implement monitoring temperature.Measure gudgeon and slag line intersection shaft place furnace shell surface of steel plate temperature, 450 ℃ of temperature are stopped refining and are changed furnace lining.
On 180 tons of argon oxygen stoves, select furnace lining operational layer material, furnace lining to build by laying bricks or stones, toast from argon oxygen stove, to smelting all by present method operation, this stove is used as a servant furnace life and has been reached 187 times.
Claims (3)
1. argon oxygen stove, it comprises furnace shell, furnace lining and air pressure gun, furnace shell has fire door, furnace crown, shaft and furnace bottom, the anti-material of contact furnace shell steel plate is permanent layer in the furnace lining, the anti-material of contact permanent layer outer contacting molten steel is working lining in the furnace lining, air pressure gun is installed in restoration of lower stack one side and on same level, inserts outside furnace shell in the stove, it is characterized in that:
IDescribed furnace lining working lining satisfies following requirement with the physical and chemical index of magnesia-calcium brick:
W(CaO)/％ 30-35；
W(MgO)/％ ≥60；
W(SiO
2＋Al
2O
3＋Fe
2O
3)/％ ≤3；
Apparent porosity/%≤16;
Volume density/g/cm
3〉=3.0;
Cold crushing strength/MPa 〉=50;
IITotal angle of described air pressure gun is that the air pressure gun spacing is not less than 380mm between 108 °～120 °, the at most equidistant air pressure gun of configuration; Its center line focus was in horizontal plane center, air pressure gun place after all air pressure guns were installed; Bonding with clay between air pressure gun and air pressure gun brick, between air pressure gun brick and adjacent bricks;
IIIAfter described furnace lining all finishes building, through following health and baking:
Buckle closure on the fire door, at normal temperatures health 24h; With Sweet natural gas or coal gas with 50 ℃ ± 5 ℃/h heat-up rate intensification 12h to being not less than 600 ℃, insulation 4～6h; Be warming up to 1050～1100 ℃ with 80 ℃ ± 5 ℃/h heat-up rate again, insulation 5～8h.
2. the working method of argon oxygen stove claimed in claim 1, it comprises following step successively:
IAll smelt steel grade, and Si content is not more than 0.30% in the pre-liquation that smelting is used, and temperature is not less than 1480 ℃, and band quantity of slag thickness is less than 50mm;
IIDuring blowing, argon oxygen stove integral body is revolved backward and is inclined 3 °～7 °;
III1～3 phase of decarburization top rifle air supply intensity is controlled at 0.85～1.40Nm
3/ min.t, the air pressure gun air supply intensity is controlled at 0.75～1.05Nm
3/ min.t;
IVBasicity of slag is controlled at 1.8～2.2; The magnesium ball added in 25～35%, 35～45%, 25～35% ratios respectively within 1～3 phase of decarburization, and MgO content is controlled at 8～12% in the slag; The smelting process molten steel temperature remains on below 1730 ℃;
VThe empty stove time shakes fire door to 120 °～240 ° downwards less than 90min; Greater than then online baking of 90min;
VITo air pressure gun and surface of steel plate temperature corresponding to the easy leak source of slag line, implement monitoring temperature in whole stove labour smelting process.
3. the working method of argon oxygen stove according to claim 2 is characterized in that: in step
VI,When the working lining residual thickness to the safety limit point, stop refining when 350 ℃～400 ℃ of 400 ℃～450 ℃ of shaft place furnace shell surface of steel plate temperature or furnace bottom place furnace shell surface of steel plate temperature and change furnace lining in the furnace shell.
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|---|---|---|---|
| CN201210332233.2A CN102899455B (en) | 2012-09-11 | 2012-09-11 | Argon-oxygen furnace and operation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201210332233.2A CN102899455B (en) | 2012-09-11 | 2012-09-11 | Argon-oxygen furnace and operation method thereof |
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| Publication Number | Publication Date |
|---|---|
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| CN102899455B CN102899455B (en) | 2014-04-16 |
Family
ID=47571940
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|---|---|---|---|
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2012
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|---|---|---|---|---|
| CN1172082A (en) * | 1996-07-25 | 1998-02-04 | 营口青花镁矿总公司 | Burnt oil-immersed conite and its manufacturing process |
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| CN101519709A (en) * | 2008-02-26 | 2009-09-02 | 宝山钢铁股份有限公司 | Gas supply method in high-carbon regions during smelting stainless steel by AOD furnace |
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|---|---|
| CN102899455B (en) | 2014-04-16 |
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