CN207862386U - A kind of pre-deoxidation device being blown carbon dust in converter taphole - Google Patents
A kind of pre-deoxidation device being blown carbon dust in converter taphole Download PDFInfo
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- CN207862386U CN207862386U CN201820065583.XU CN201820065583U CN207862386U CN 207862386 U CN207862386 U CN 207862386U CN 201820065583 U CN201820065583 U CN 201820065583U CN 207862386 U CN207862386 U CN 207862386U
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Abstract
The utility model belongs to technical field of ferrous metallurgy, discloses a kind of pre-deoxidation device being blown carbon dust in converter taphole.The overall channel of a piece injection carbon dust of arrangement on the parallel direction with tapping hole, the overall channel of injection carbon dust is connect with powder spraying system, 2~8 groups of circular ring shape toner passages are arranged around tapping hole, all circular ring shape toner passages 3 are connected with the overall channel of injection carbon dust, and 2~8 carbon dust jet pipes being embedded in the resistance to material of tapping hole are all connected on each group of toner passage.By the carbon dust jet pipe inside tapping hole, into tapping steel stream, injection carbon dust can be escaped from tapping steel stream and be drained into air come deoxidation, deoxidation products CO, gaseous state CO, and field trash will not be left in molten steel, will not generate harm to steel product quality.
Description
Technical field
The utility model belongs to technical field of ferrous metallurgy, in particular, the utility model is related to one kind in converter tapping
The pre-deoxidation device of carbon dust is blown in mouthful.
Background technology
Converter possesses very strong de- C, de- P abilities, and with the promotion that client requires steel product quality, most of steel mill turns
Stove carries out deep de- P operation in smelting, converter smelting endpoint controls P≤0.015%, for phosphorus is controlled the lower content, needs
It increases oxygen-supplying amount and carries out dephosphorization under oxidizing atmosphere, steel water oxygen is controlled in 400~600ppm, causes Molten Steel over-oxidation serious.To reach
To the effect of deep dephosphorization, the method for being blown into excessive oxygen, in addition to ultra-low-carbon steel, converter smelting endpoint molten steel are generally taken in converter
In carbon also much smaller than the carbon in steel subject component.
Steel mill largely uses and is dissolved these by adding strong deoxidier into ladle in converter tapping process at present
Oxygen removal, deoxidier are generally the substance containing Al, Si, Mn, Ca, Mg, possess very strong deoxidizing capacity, but these deoxidiers with
Al can be generated after oxygen reaction2O3、SiO2, field trashes, these field trashes such as MnO, CaO, MgO have prodigious harm to steel, need
It is removed by subsequent Argon or refining procedure, the Argon of long period and refining can increase production cost.
Also part steel mill uses 1/2~1/3 period before converter tapping process to add part carbon dust use into ladle
In pre-deoxidation, the strong deoxidier of aluminium class is added into ladle for deep deoxidation in the later stage of converter tapping process, and add alloy tune
Whole molten steel composition.Part aluminium class deoxidier is replaced to be taken off with carbon dust although this method can be played in the early period of converter tapping process
The effect of oxygen, but in the middle and later periods of converter tapping process, due to the addition of aluminium class deoxidier and the stronger alloy of deoxidizing capacity,
So that main deoxidation remains as aluminium class deoxidier and the stronger alloy of deoxidizing capacity, carbon dust does not have deoxidation effect
Fruit.And since toner density is small, after being added in ladle, the undissolved carbon dust in molten steel can float to molten steel surface, deoxidation
Dynamic conditions is poor.
Utility model content
In order to solve the above problem, the utility model provides a kind of pre-deoxidation device being blown carbon dust in converter taphole.
A kind of pre-deoxidation device being blown carbon dust in converter taphole, which is characterized in that in parallel and tapping hole side
The overall channel of a piece injection carbon dust of arrangement upwards, the overall channel of injection carbon dust is connect with powder spraying system, around tapping hole cloth
2~8 groups of circular ring shape toner passages are set, all circular ring shape toner passages 3 are connected with the overall channel of injection carbon dust, and every
2~8 carbon dust jet pipes being embedded in the resistance to material of tapping hole are all connected on one group of toner passage.
It is furthermore preferred that the pre-deoxidation device for being blown carbon dust in converter taphole further includes valve；It is blown the total of carbon dust
Channel is connect by valve with powder spraying system.
It is furthermore preferred that the pre-deoxidation device for being blown carbon dust in converter taphole further includes flowmeter and/or pressure gauge；Spray
The overall channel for blowing carbon dust is connect by flowmeter and/or pressure gauge with powder spraying system.
It is furthermore preferred that the pre-deoxidation device for being blown carbon dust in converter taphole further includes buffering gas tank；Carbon dust is blown to use
Overall channel by flowmeter, pressure gauge, buffering one or more of gas tank and/or valve connect with powder spraying system.
Preferably, the internal diameter of the overall channel of injection carbon dust is 20~30mm of Φ, and material is steel.
Preferably, the internal diameter of circular ring shape toner passage is 10~15mm of Φ, and material is steel.
Preferably, the internal diameter of carbon dust jet pipe is 4~9mm of Φ, and material is steel.
When needing replacing tapping hole, the tapping hole for being disposed with carbon dust jet pipe is installed in converter, by exposure and tapping hole
The overall channel and circular ring shape toner passage of external injection carbon dust are wrapped with fire clay, and converter waste heat dries fire clay
Afterwards, converter can carry out normal smelting operation.
The advantages of the utility model
1, carbon dust is blown come deoxidation, deoxidation products CO, gas into tapping steel stream by the carbon dust jet pipe inside tapping hole
State CO can be escaped from tapping steel stream and be drained into air, and field trash will not be left in molten steel, will not be generated to steel product quality
Harm.
2, in addition to ultra-low-carbon steel, the carbon in converter smelting endpoint molten steel is much smaller than the carbon in steel subject component, carbon dust tool
There is larger deoxidation space, possesses very strong deoxidizing capacity, it can be by molten steel 40% or more dissolving oxygen removal.
3, carbon dust is cheap, and deoxidation is carried out compared to aluminium, and 90% deoxidation cost can be about saved using carbon dust；It compares
In carrying out deoxidation with silicon, 80% deoxidation cost can be about saved using carbon dust.
Description of the drawings：
Fig. 1, the schematic diagram that carbon dust jet pipe is arranged on converter taphole.
Fig. 2, the faces the A-A sectional view after carbon dust jet pipe is arranged on converter taphole.
Fig. 3, the faces the B-B sectional view after carbon dust jet pipe is arranged on converter taphole.
Wherein：1：Steel circulation road in tapping hole；2：The layer of resistance to material on tapping hole；3：Around the circular ring shape of tapping hole arrangement
Toner passage；4：The carbon dust jet pipe being embedded in the tapping hole layer of resistance to material；5：The overall channel of supply toner；6：Flowmeter；7：Pressure
Table；8：Buffer gas tank；9：Valve；10：Powder spraying system.
Specific implementation mode：
Shown in Fig. 1, Fig. 2, Fig. 3, the overall channel 5 of a piece injection carbon dust of arrangement on the parallel direction with tapping hole,
The internal diameter for being blown the overall channel 5 of carbon dust is 20~30mm of Φ, and material is steel, and the overall channel 5 of injection carbon dust passes through flow
Meter 6, pressure gauge 7, buffering gas tank 8, valve 9 are connect with powder spraying system 10, arrange that 2~8 groups of circular ring shape carbon dusts are logical around tapping hole
Road 3, the internal diameter of circular ring shape toner passage 3 are 10~15mm of Φ, and material is steel, all circular ring shape toner passages 3 with spray
The overall channel 5 for blowing carbon dust is connected, and all connected on each group of toner passage 3 2~8 inlay in the resistance to material of tapping hole 2
The internal diameter of carbon dust jet pipe 4, carbon dust jet pipe 4 is 4~9mm of Φ, and material is steel.
When needing replacing tapping hole, the tapping hole for being disposed with carbon dust jet pipe is installed in converter, by exposure and tapping hole
The overall channel 5 and circular ring shape toner passage 3 of external injection carbon dust are wrapped with fire clay, and converter waste heat dries fire clay
Afterwards, converter can carry out normal smelting operation.
After the completion of converter smelting, the carbon content in converter smelting endpoint molten steel and oxygen content, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, 10 supply argon gas of powder spraying system lead to that is, in overall channel 5
Argon gas keeps 2~3 atmospheric pressure of argon pressure in jet pipe 4, and reaching prevents tapping steel stream from pouring in down a chimney to being embedded in the resistance to material of tapping hole
The effect of carbon dust jet pipe 4 in layer, after steel stream is shown in tapping, powder spraying system 10 supplies the mixture of argon gas and carbon dust, according to converter
[C] in smelting endpoint molten steel, the carbon content in the content and molten steel subject component of [O] determine that carbon dust straying quatity, carbon dust spray into
3. gauge formula sees below formula, be blown carbon dust during, keep jet pipe 4 in argon pressure be 2~3 atmospheric pressure, carbon dust with
Dissolved oxygen [O] in molten steel, which reacts, generates CO.
WC=(WO-0.0023/WC targets)×(12/16)×WMolten steel×10+(WC targets-WC converters)×WMolten steel×10③
Formula 3. in WCFor：The carbon dust amount (kg) of injection, WOFor：Converter smelting endpoint oxygen content (%), WC targetsFor：Converter smelting
Refine endpoint carbon content (%), WMolten steelFor：BOF nominal capacity (ton), WC targetsFor：Carbon content (%) in molten steel subject component.
Carbon dust and the dissolved oxygen [O] in molten steel, which react, generates the reacting as shown in 1. formula of CO, and the 1. reaction of formula balances
Constant calculations formula is as shown in 2. formula.
[C]+[O]→CO ①
K=a[C]×a[O]/PCO ②
By looking into thermodynamics handbook, at 1600 DEG C, the equilibrium constant K of 1 formula of reaction is 2.3 × 10-3。
Carbon dust is blown to molten steel carry out pre-deoxidation by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole, according to
Reaction equation 2., if carbon content in molten steel subject component is 0.1~0.2%, the oxygen in molten steel can be taken off to 115~
230ppm, can be by molten steel 40% or more dissolving oxygen removal.
In the actual production process, since CO is difficult to be dissolved into molten steel, the CO that reaction between carbon and oxygen generates can float up to molten steel
It in the interface of air, and can burn under high temperature environment, CO intoxicating phenomenons will not occur.
Carbon dust jet pipe is mounted in the resistance to material of tubulose of converter taphole, and in tapping process, molten steel flows through tapping hole channel
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation flows in ladle, the carbon dust of ejection be removing flow out converter but
The dissolved oxygen in the molten steel in ladle is not flowed into also.Deoxidation phenomenon will not occur for the molten steel in converter, also would not gas producer slag
In phosphorus " the rephosphorization phenomenon " that is shifted into molten steel.The strong deoxidier of aluminium class and alloy being added in ladle will not influence carbon dust
Deoxygenation, in entire tapping process, all lasting performance deoxidation effect of carbon dust.
Reaction product CO is escaped from tapping steel stream with gaseous state and is drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Embodiment 1,
Shown in Fig. 1, Fig. 2, Fig. 3, the overall channel 5 of a piece injection carbon dust of arrangement on the parallel direction with tapping hole,
The internal diameter of overall channel 5 for being blown carbon dust is Φ 30mm, and material is steel, be blown the overall channel 5 of carbon dust by flowmeter 6,
Pressure gauge 7, buffering gas tank 8, valve 9 are connect with powder spraying system 10, and 4 groups of circular ring shape toner passages 3, annulus are arranged around tapping hole
The internal diameter of shape toner passage 3 is Φ 15mm, and material is steel, and all circular ring shape toner passages 3 are total with injection carbon dust
Channel 5 is connected, and all connects 8 on each group of toner passage 3 and inlay and the carbon dust jet pipe 4 in the resistance to material of tapping hole 2, carbon dust spray
The internal diameter of pipe 4 is Φ 5mm, and material is steel.
When needing replacing tapping hole, the tapping hole for being disposed with carbon dust jet pipe is installed in converter, by exposure and tapping hole
The overall channel 5 and circular ring shape toner passage 3 of external injection carbon dust are wrapped with fire clay, and converter waste heat dries fire clay
Afterwards, converter can carry out normal smelting operation.
After the completion of converter smelting, the carbon content in converter smelting endpoint molten steel and oxygen content, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, 10 supply argon gas of powder spraying system lead to that is, in overall channel 5
Argon gas keeps 2 atmospheric pressure of argon pressure in jet pipe 4, and reaching prevents tapping steel stream from pouring in down a chimney to being embedded in the tapping hole layer of resistance to material
The effect of interior carbon dust jet pipe 4, after steel stream is shown in tapping, powder spraying system 10 supplies the mixture of argon gas and carbon dust, according to converter smelting
The carbon content refined in the content and molten steel subject component of [C] in endpoint molten steel, [O] determines carbon dust straying quatity, carbon dust straying quatity
3. calculating formula sees below formula, during being blown carbon dust, keep the argon pressure in jet pipe 4 for 2 atmospheric pressure, in carbon dust and molten steel
Dissolved oxygen [O] react generate CO.
WC=(WO-0.0023/WC targets)×(12/16)×WMolten steel×10+(WC targets-WC converters)×WMolten steel×10 ③
Formula 3. in WCFor：The carbon dust amount (kg) of injection, WOFor：Converter smelting endpoint oxygen content (%), WC targetsFor：Converter smelting
Refine endpoint carbon content (%), WMolten steelFor：BOF nominal capacity (ton), WC targetsFor：Carbon content (%) in molten steel subject component.
BOF nominal capacity is 120 tons, and the carbon content in the converter smelting endpoint molten steel of the stove molten steel is 0.06%, and oxygen contains
Amount is 0.042, and the carbon content in molten steel subject component is 0.17%, and it is 157kg that carbon dust straying quatity is 3. calculated according to formula, is turned
The stove tapping time is 5 minutes, is computed, and it is 32kg/min that carbon dust, which sprays into speed, and the carbon dust blanking velocity in powder spraying system 10 was both
For 32kg/min.
Carbon dust and the dissolved oxygen [O] in molten steel, which react, generates the reacting as shown in 1. formula of CO, and the 1. reaction of formula balances
Constant calculations formula is as shown in 2. formula.
[C]+[O]→CO ①
K=a[C]×a[O]/PCO ②
By looking into thermodynamics handbook, at 1600 DEG C, the equilibrium constant K of 1 formula of reaction is 2.3 × 10-3。
Carbon dust is blown to molten steel carry out pre-deoxidation by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole, according to
2., the carbon content in molten steel subject component is 0.17% to reaction equation, then the oxygen in molten steel can be taken off to 135ppm, can be by converter steel
68% dissolving oxygen removal in water.Aluminium class consumption 25kg is reduced, reduces by 300 yuan/stove of production cost, and reduce in molten steel
Al2O3The amount of inclusions reduces total oxygen content 3ppm in strand.
In process of production, since CO is difficult to be dissolved into molten steel, the CO that reaction between carbon and oxygen generates can float up to molten steel and sky
It in the interface of gas, and can burn under high temperature environment, CO intoxicating phenomenons will not occur.
Carbon dust jet pipe is mounted in the resistance to material of tubulose of converter taphole, and in tapping process, molten steel flows through tapping hole channel
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation flows in ladle, the carbon dust of ejection be removing flow out converter but
The dissolved oxygen in the molten steel in ladle is not flowed into also.Deoxidation phenomenon will not occur for the molten steel in converter, also would not gas producer slag
In phosphorus " the rephosphorization phenomenon " that is shifted into molten steel.The strong deoxidier of aluminium class and alloy being added in ladle will not influence carbon dust
Deoxygenation, in entire tapping process, all lasting performance deoxidation effect of carbon dust.
Reaction product CO is escaped from tapping steel stream with gaseous state and is drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Embodiment 2,
Shown in Fig. 1, Fig. 2, Fig. 3, the overall channel 5 of a piece injection carbon dust of arrangement on the parallel direction with tapping hole,
The internal diameter of overall channel 5 for being blown carbon dust is Φ 20mm, and material is steel, be blown the overall channel 5 of carbon dust by flowmeter 6,
Pressure gauge 7, buffering gas tank 8, valve 9 are connect with powder spraying system 10, and 2 groups of circular ring shape toner passages 3, annulus are arranged around tapping hole
The internal diameter of shape toner passage 3 is Φ 13mm, and material is steel, and all circular ring shape toner passages 3 are total with injection carbon dust
Channel 5 is connected, and all connects 5 on each group of toner passage 3 and inlay and the carbon dust jet pipe 4 in the resistance to material of tapping hole 2, carbon dust spray
The internal diameter of pipe 4 is Φ 6mm, and material is steel.
When needing replacing tapping hole, the tapping hole for being disposed with carbon dust jet pipe is installed in converter, by exposure and tapping hole
The overall channel 5 and circular ring shape toner passage 3 of external injection carbon dust are wrapped with fire clay, and converter waste heat dries fire clay
Afterwards, converter can carry out normal smelting operation.
After the completion of converter smelting, the carbon content in converter smelting endpoint molten steel and oxygen content, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, 10 supply argon gas of powder spraying system lead to that is, in overall channel 5
Argon gas keeps 3 atmospheric pressure of argon pressure in jet pipe 4, and reaching prevents tapping steel stream from pouring in down a chimney to being embedded in the tapping hole layer of resistance to material
The effect of interior carbon dust jet pipe 4, after steel stream is shown in tapping, powder spraying system 10 supplies the mixture of argon gas and carbon dust, according to converter smelting
The carbon content refined in the content and molten steel subject component of [C] in endpoint molten steel, [O] determines carbon dust straying quatity, carbon dust straying quatity
3. calculating formula sees below formula, during being blown carbon dust, keep the argon pressure in jet pipe 4 for 3 atmospheric pressure, in carbon dust and molten steel
Dissolved oxygen [O] react generate CO.
WC=(WO-0.0023/WC targets)×(12/16)×WMolten steel×10+(WC targets-WC converters)×WMolten steel×10 ③
Formula 3. in WCFor：The carbon dust amount (kg) of injection, WOFor：Converter smelting endpoint oxygen content (%), WC targetsFor：Converter smelting
Refine endpoint carbon content (%), WMolten steelFor：BOF nominal capacity (ton), WC targetsFor：Carbon content (%) in molten steel subject component.
BOF nominal capacity is 100 tons, and the carbon content in the converter smelting endpoint molten steel of the stove molten steel is 0.07%, and oxygen contains
Amount is 0.035, and the carbon content in molten steel subject component is 0.12%, and it is 64kg that carbon dust straying quatity is 3. calculated according to formula, is turned
The stove tapping time is 5 minutes, is computed, and it is 13kg/min that carbon dust, which sprays into speed, and the carbon dust blanking velocity in powder spraying system 10 was both
For 13kg/min.
Carbon dust and the dissolved oxygen [O] in molten steel, which react, generates the reacting as shown in 1. formula of CO, and the 1. reaction of formula balances
Constant calculations formula is as shown in 2. formula.
[C]+[O]→CO ①
K=a[C]×a[O]/PCO ②
By looking into thermodynamics handbook, at 1600 DEG C, the equilibrium constant K of 1 formula of reaction is 2.3 × 10-3。
Carbon dust is blown to molten steel carry out pre-deoxidation by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole, according to
2., the carbon content in molten steel subject component is 0.12% to reaction equation, then the oxygen in molten steel can be taken off to 192ppm, can be by converter steel
45% dissolving oxygen removal in water.Aluminium class consumption 14kg is reduced, reduces by 150 yuan/stove of production cost, and reduce in molten steel
Al2O3The amount of inclusions reduces total oxygen content 2ppm in strand.
In process of production, since CO is difficult to be dissolved into molten steel, the CO that reaction between carbon and oxygen generates can float up to molten steel and sky
It in the interface of gas, and can burn under high temperature environment, CO intoxicating phenomenons will not occur.
Carbon dust jet pipe is mounted in the resistance to material of tubulose of converter taphole, and in tapping process, molten steel flows through tapping hole channel
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation flows in ladle, the carbon dust of ejection be removing flow out converter but
The dissolved oxygen in the molten steel in ladle is not flowed into also.Deoxidation phenomenon will not occur for the molten steel in converter, also would not gas producer slag
In phosphorus " the rephosphorization phenomenon " that is shifted into molten steel.The strong deoxidier of aluminium class and alloy being added in ladle will not influence carbon dust
Deoxygenation, in entire tapping process, all lasting performance deoxidation effect of carbon dust.
Reaction product CO is escaped from tapping steel stream with gaseous state and is drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Claims (7)
1. a kind of pre-deoxidation device being blown carbon dust in converter taphole, which is characterized in that in parallel and tapping hole direction
The overall channel of a piece injection carbon dust of upper arrangement, the overall channel of injection carbon dust are connect with powder spraying system, and 2 are arranged around tapping hole
~8 groups of circular ring shape toner passages, all circular ring shape toner passages are connected with the overall channel of injection carbon dust, and each group
2~8 carbon dust jet pipes being embedded in the resistance to material of tapping hole are all connected on toner passage.
2. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that go out in converter
It further includes valve that the pre-deoxidation device of carbon dust is blown in steel mouth；The overall channel for being blown carbon dust is connected by valve and powder spraying system
It connects.
3. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that go out in converter
It further includes flowmeter and/or pressure gauge that the pre-deoxidation device of carbon dust is blown in steel mouth；The overall channel of injection carbon dust passes through flow
Meter and/or pressure gauge are connect with powder spraying system.
4. the pre-deoxidation device as described in any one of claims 1-3 for being blown carbon dust in converter taphole, which is characterized in that
The pre-deoxidation device that carbon dust is blown in converter taphole further includes buffering gas tank；The overall channel of injection carbon dust passes through flow
Meter, pressure gauge, buffering one or more of gas tank and/or valve are connect with powder spraying system.
5. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that the injection
The internal diameter of the overall channel of carbon dust is 20~30mm of Φ, and material is steel.
6. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that the annulus
The internal diameter of shape toner passage is 10~15mm of Φ, and material is steel.
7. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that the carbon dust
The internal diameter of jet pipe is 4~9mm of Φ, and material is steel.
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060288A (en) * | 2018-01-13 | 2018-05-22 | 山东钢铁股份有限公司 | A kind of pre-deoxidation method and device that carbon dust is blown in converter taphole |
| WO2021208450A1 (en) * | 2020-04-16 | 2021-10-21 | 沈阳东大山汇环境科技有限公司 | Zinc recovery method and device for blast furnace or shaft furnace |
-
2018
- 2018-01-13 CN CN201820065583.XU patent/CN207862386U/en active Active
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108060288A (en) * | 2018-01-13 | 2018-05-22 | 山东钢铁股份有限公司 | A kind of pre-deoxidation method and device that carbon dust is blown in converter taphole |
| WO2021208450A1 (en) * | 2020-04-16 | 2021-10-21 | 沈阳东大山汇环境科技有限公司 | Zinc recovery method and device for blast furnace or shaft furnace |
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