CN108060288A - A kind of pre-deoxidation method and device that carbon dust is blown in converter taphole - Google Patents
A kind of pre-deoxidation method and device that carbon dust is blown in converter taphole Download PDFInfo
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- CN108060288A CN108060288A CN201810038548.3A CN201810038548A CN108060288A CN 108060288 A CN108060288 A CN 108060288A CN 201810038548 A CN201810038548 A CN 201810038548A CN 108060288 A CN108060288 A CN 108060288A
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- carbon dust
- converter
- blown
- deoxidation
- steel
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- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 title claims abstract description 214
- 229910052799 carbon Inorganic materials 0.000 title claims abstract description 214
- 239000000428 dust Substances 0.000 title claims abstract description 177
- 238000000034 method Methods 0.000 title claims abstract description 35
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 173
- 239000010959 steel Substances 0.000 claims abstract description 173
- 238000010079 rubber tapping Methods 0.000 claims abstract description 96
- 239000001301 oxygen Substances 0.000 claims abstract description 49
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 49
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 48
- 239000000463 material Substances 0.000 claims abstract description 38
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 54
- 238000003723 Smelting Methods 0.000 claims description 33
- 239000007789 gas Substances 0.000 claims description 30
- 229910052786 argon Inorganic materials 0.000 claims description 27
- 239000000843 powder Substances 0.000 claims description 26
- 238000005507 spraying Methods 0.000 claims description 24
- 238000002347 injection Methods 0.000 claims description 23
- 239000007924 injection Substances 0.000 claims description 23
- 230000000694 effects Effects 0.000 claims description 14
- 239000000203 mixture Substances 0.000 claims description 11
- 239000004927 clay Substances 0.000 claims description 10
- 230000003139 buffering effect Effects 0.000 claims description 7
- 239000002918 waste heat Substances 0.000 claims description 5
- 238000007670 refining Methods 0.000 claims description 3
- 235000013399 edible fruits Nutrition 0.000 claims description 2
- 229910052782 aluminium Inorganic materials 0.000 abstract description 3
- 229910052710 silicon Inorganic materials 0.000 abstract description 3
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 abstract description 2
- 239000004411 aluminium Substances 0.000 abstract description 2
- 238000009851 ferrous metallurgy Methods 0.000 abstract description 2
- 239000010813 municipal solid waste Substances 0.000 abstract description 2
- 239000010703 silicon Substances 0.000 abstract description 2
- 238000006243 chemical reaction Methods 0.000 description 21
- 150000001398 aluminium Chemical class 0.000 description 12
- 229910045601 alloy Inorganic materials 0.000 description 8
- 239000000956 alloy Substances 0.000 description 8
- 238000006392 deoxygenation reaction Methods 0.000 description 8
- 238000004519 manufacturing process Methods 0.000 description 8
- 239000000047 product Substances 0.000 description 7
- 239000007921 spray Substances 0.000 description 7
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 description 5
- 229910052698 phosphorus Inorganic materials 0.000 description 5
- 239000011574 phosphorus Substances 0.000 description 5
- 239000007795 chemical reaction product Substances 0.000 description 4
- 231100000567 intoxicating Toxicity 0.000 description 4
- 230000002673 intoxicating effect Effects 0.000 description 4
- 230000002045 lasting effect Effects 0.000 description 4
- 238000012797 qualification Methods 0.000 description 4
- 239000002893 slag Substances 0.000 description 4
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 3
- 229910001209 Low-carbon steel Inorganic materials 0.000 description 2
- VYPSYNLAJGMNEJ-UHFFFAOYSA-N Silicium dioxide Chemical compound O=[Si]=O VYPSYNLAJGMNEJ-UHFFFAOYSA-N 0.000 description 2
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
- 238000007664 blowing Methods 0.000 description 2
- 229910052593 corundum Inorganic materials 0.000 description 2
- 229910001845 yogo sapphire Inorganic materials 0.000 description 2
- 229910052791 calcium Inorganic materials 0.000 description 1
- 229910052681 coesite Inorganic materials 0.000 description 1
- 229910052906 cristobalite Inorganic materials 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000005516 engineering process Methods 0.000 description 1
- 239000004744 fabric Substances 0.000 description 1
- 229910052749 magnesium Inorganic materials 0.000 description 1
- 229910052748 manganese Inorganic materials 0.000 description 1
- 238000007254 oxidation reaction Methods 0.000 description 1
- 230000001590 oxidative effect Effects 0.000 description 1
- 239000000377 silicon dioxide Substances 0.000 description 1
- 229910052682 stishovite Inorganic materials 0.000 description 1
- 239000000126 substance Substances 0.000 description 1
- 229910052905 tridymite Inorganic materials 0.000 description 1
Classifications
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/06—Deoxidising, e.g. killing
-
- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21C—PROCESSING OF PIG-IRON, e.g. REFINING, MANUFACTURE OF WROUGHT-IRON OR STEEL; TREATMENT IN MOLTEN STATE OF FERROUS ALLOYS
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
- C21C7/0037—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material
- C21C7/0043—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00 by injecting powdered material into the falling stream of molten metal
Landscapes
- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention belongs to technical field of ferrous metallurgy, in particular it relates to a kind of pre-deoxidation method and device that carbon dust is blown in converter taphole.Several groups of carbon dust jet pipes are installed in the resistance to material of tubulose of converter taphole, in converter tapping process, carbon dust are blown into tapping steel stream by carbon dust jet pipe, carbon dust reacts with the dissolved oxygen [O] in molten steel and generates CO.Carbon dust is blown come deoxidation into tapping steel stream by the carbon dust jet pipe inside tapping hole, deoxidation products CO, gaseous state CO can be escaped from tapping steel stream and drained into air, and field trash will not be left in molten steel, will not generate harm to steel product quality.Carbon dust has larger deoxidation space, possesses very strong deoxidizing capacity, can be by molten steel more than 40% dissolving oxygen removal.Compared to with aluminium deoxidation, can about be saved using carbon dust 90% deoxidation cost；Deoxidation is carried out compared to silicon, 80% deoxidation cost can be about saved using carbon dust.
Description
Technical field
The invention belongs to technical field of ferrous metallurgy, in particular it relates to which a kind of be blown in converter taphole
The pre-deoxidation method and device of carbon dust.
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 control P≤0.015% for the content for controlling this relatively low in phosphorus, 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, the field trashes such as MnO, CaO, MgO, these field trashes have very big harm to steel, it is necessary to
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 in the later stage of converter tapping process for deep deoxidation, and adds alloy tune
Whole molten steel composition.With carbon dust part aluminium class deoxidier is replaced to be taken off 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 adding in ladle, the undissolved carbon dust in molten steel can float to molten steel surface, deoxidation
Dynamic conditions is poor.
The content of the invention
To solve problem above, the present invention provides a kind of pre-deoxidation method and dress that carbon dust is blown in converter taphole
It puts.
A kind of pre-deoxidation device that carbon dust is blown 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 connected with powder spraying system, around tapping hole cloth
2~8 groups of circular ring shape toner passages are put, all circular ring shape toner passages 3 are connected with being blown the overall channel of 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 that carbon dust is blown in converter taphole further includes valve；It is blown the total of carbon dust
Passage is connected by valve with powder spraying system.
It is furthermore preferred that the pre-deoxidation device that carbon dust is blown in converter taphole further includes flowmeter and/or pressure gauge；Spray
The overall channel for blowing carbon dust is connected by flowmeter and/or pressure gauge with powder spraying system.
It is furthermore preferred that the pre-deoxidation device that carbon dust is blown 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 be connected with powder spraying system.
Preferably, the internal diameter for being blown the overall channel of 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 present invention provides a kind of pre-deoxidation method that carbon dust is blown in converter taphole, and method is：In converter tapping
Several groups of carbon dust jet pipes are installed in the resistance to material of tubulose of mouth, in converter tapping process, are sprayed by carbon dust jet pipe into tapping steel stream
Carbon dust is blown, carbon dust reacts with the dissolved oxygen [O] in molten steel and generates CO.
Carbon dust reacts the reaction for generating CO as shown in 1. formula with the dissolved oxygen [O] in molten steel, 1. the reaction balance of formula
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。
In the actual production process, converter smelting endpoint detects the content of the carbon and oxygen in molten steel, and root by sublance
According to the carbon content in molten steel subject component, determine the carbon dust amount of injection, pass through the carbon installed in the resistance to material of the tubulose of converter taphole
Powder jet pipe carries out pre-deoxidation to molten steel injection carbon dust, according to reaction equation 2., if carbon content in molten steel subject component for 0.1~
0.2%, then the oxygen in molten steel can be taken off to 115~230ppm, in molten steel more than 40% dissolving oxygen removal can be conducive to subtract
Few aluminium class deoxidier consumption and reduction deoxidation type inclusion growing amount.
After the completion of converter smelting, carbon content and oxygen content in converter smelting endpoint molten steel, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, powder spraying system leads to argon only for argon gas is answered that is, in overall channel
Gas keeps 2~3 atmospheric pressure of argon pressure in jet pipe, 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, after steel stream is shown in tapping, the mixture of powder spraying system supply argon gas and carbon dust is whole according to converter smelting
[C] in point molten steel, the carbon content in the content and molten steel subject component of [O] determine carbon dust straying quatity, are blown the process of carbon dust
In, keeping the argon pressure in jet pipe 4, carbon dust reacts with the dissolved oxygen [O] in molten steel and generates CO for 2~3 atmospheric pressure.
In the actual production process, since CO is difficult to be dissolved into molten steel, the CO of reaction between carbon and oxygen generation can float up to molten steel
It in the interface of air, and can burn in high temperature environments, 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 passage
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation is flowed in ladle, the carbon dust of ejection be removing outflow 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 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 drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Advantages of the present invention
1st, 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 drained into air, and field trash will not be left in molten steel, steel product quality will not be generated
Harm.
2nd, 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, possess very strong deoxidizing capacity, it can be by molten steel more than 40% dissolving oxygen removal.
3rd, 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.
4th, carbon dust is blown to carry out the method for deoxidation be to not into tapping steel stream by the carbon dust jet pipe inside tapping hole
The molten steel flowed into ladle carries out deoxidation, and the strong deoxidier added in ladle does not interfere with the deoxidation behavior of carbon dust, is entirely turning
In stove tapping process, all deoxidation is occurring for carbon dust；And in the converter tapping later stage, the carbon dust added into ladle does not have de-
Oxygen effect, that plays main deoxidation remains as aluminium class deoxidier and the stronger alloy of deoxidizing capacity, inside tapping hole
Carbon dust jet pipe to tapping steel stream in be blown carbon dust come carry out the method for deoxidation have be substantially better than the carbon dust added into ladle into
The effect of the method for row deoxidation.
Description of the drawings：
Fig. 1, the schematic diagram that carbon dust jet pipe is arranged on converter taphole.
Fig. 2, the A-A faces sectional view after carbon dust jet pipe is arranged on converter taphole.
Fig. 3, the B-B faces 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 embodiment：
As 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 connected with powder spraying system 10, arrange that 2~8 groups of circular ring shape carbon dusts lead to 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 2~8 are all connected on each group of toner passage 3 and is inlayed in material 2 resistance to tapping hole
Carbon dust jet pipe 4, the internal diameter of 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, carbon content and oxygen content in converter smelting endpoint molten steel, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, powder spraying system 10 leads to only for argon gas is answered 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 carbon dust straying quatity, and carbon dust sprays into
3. gauge formula sees below formula, during being blown carbon dust, keep the argon pressure in jet pipe 4 as 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×10 ③
Formula 3. middle 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 reacts the reaction for generating CO as shown in 1. formula with the dissolved oxygen [O] in molten steel, 1. the reaction balance of formula
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 by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole and carries out pre-deoxidation, 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 more than 40% dissolving oxygen removal.
In the actual production process, since CO is difficult to be dissolved into molten steel, the CO of reaction between carbon and oxygen generation can float up to molten steel
It in the interface of air, and can burn in high temperature environments, 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 passage
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation is flowed in ladle, the carbon dust of ejection be removing outflow 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 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 drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Embodiment 1,
As 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 connected 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
Passage 5 is connected, and 8 carbon dust jet pipes 4 inlayed in material 2 resistance to tapping hole are all connected on each group of toner passage 3, 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, carbon content and oxygen content in converter smelting endpoint molten steel, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, powder spraying system 10 leads to only for argon gas is answered 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, the argon pressure in jet pipe 4 is kept as 2 atmospheric pressure, in carbon dust and molten steel
Dissolved oxygen [O] react generation CO.
WC=(WO-0.0023/WC targets)×(12/16)×WMolten steel×10+(WC targets-WC converters)×WMolten steel×10 ③
Formula 3. middle 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
It measures as 0.042, the carbon content in molten steel subject component is 0.17%, and carbon dust straying quatity is 3. calculated according to formula as 157kg, turns
The stove tapping time is 5 minutes, is computed, and carbon dust sprays into speed as 32kg/min, and the carbon dust blanking velocity in powder spraying system 10 was both
For 32kg/min.
Carbon dust reacts the reaction for generating CO as shown in 1. formula with the dissolved oxygen [O] in molten steel, 1. the reaction balance of formula
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 by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole and carries out pre-deoxidation, 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, 300 yuan/stove of production cost is reduced, and reduces 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 of reaction between carbon and oxygen generation can float up to molten steel and sky
It in the interface of gas, and can burn in high temperature environments, 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 passage
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation is flowed in ladle, the carbon dust of ejection be removing outflow 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 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 drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Embodiment 2,
As 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 connected 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
Passage 5 is connected, and 5 carbon dust jet pipes 4 inlayed in material 2 resistance to tapping hole are all connected on each group of toner passage 3, 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, carbon content and oxygen content in converter smelting endpoint molten steel, molten steel are detected using sublance
After composition and temperature qualification, tapping steel, rocking-turn converter body are carried out, powder spraying system 10 leads to only for argon gas is answered 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, the argon pressure in jet pipe 4 is kept as 3 atmospheric pressure, in carbon dust and molten steel
Dissolved oxygen [O] react generation CO.
WC=(WO-0.0023/WC targets)×(12/16)×WMolten steel×10+(WC targets-WC converters)×WMolten steel×10 ③
Formula 3. middle 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
It measures as 0.035, the carbon content in molten steel subject component is 0.12%, and carbon dust straying quatity is 3. calculated according to formula as 64kg, turns
The stove tapping time is 5 minutes, is computed, and carbon dust sprays into speed as 13kg/min, and the carbon dust blanking velocity in powder spraying system 10 was both
For 13kg/min.
Carbon dust reacts the reaction for generating CO as shown in 1. formula with the dissolved oxygen [O] in molten steel, 1. the reaction balance of formula
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 by the carbon dust jet pipe installed in the resistance to material of the tubulose of converter taphole and carries out pre-deoxidation, 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, 150 yuan/stove of production cost is reduced, and reduces 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 of reaction between carbon and oxygen generation can float up to molten steel and sky
It in the interface of gas, and can burn in high temperature environments, 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 passage
When, the deoxygenation of carbon dust and [O] occurs, the molten steel after deoxidation is flowed in ladle, the carbon dust of ejection be removing outflow 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 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 drained into air, will not be left and is mingled in molten steel
Object will not generate harm to steel product quality.
Claims (10)
1. a kind of pre-deoxidation device that carbon dust is blown in converter taphole, which is characterized in that in parallel and tapping hole direction
The overall channel of a upper piece injection carbon dust of arrangement, the overall channel of injection carbon dust are connected 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 being blown the overall channel of 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
The pre-deoxidation device that carbon dust is blown in steel mouth further includes valve；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
The pre-deoxidation device that carbon dust is blown in steel mouth further includes flowmeter and/or pressure gauge；The overall channel of injection carbon dust passes through flow
Meter and/or pressure gauge are connected with powder spraying system.
4. as claim 1-3 any one of them is blown the pre-deoxidation device of 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 connected 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 injection carbon dust
The internal diameter of overall channel 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 circular ring shape carbon
The internal diameter of powder 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 carbon dust jet pipe
Internal diameter for 4~9mm of Φ, material is steel.
8. the pre-deoxidation device of carbon dust is blown in converter taphole as described in claim 1, which is characterized in that need replacing
During tapping hole, the tapping hole for being disposed with carbon dust jet pipe is installed in converter, exposure and the injection carbon dust outside tapping hole are used
Overall channel and circular ring shape toner passage wrapped with fire clay, after converter waste heat dries fire clay, converter can carry out just
Normal smelting operation.
A kind of 9. pre-deoxidation method that carbon dust is blown in converter taphole, it is characterised in that：It is resistance in the tubulose of converter taphole
Several groups of carbon dust jet pipes in material are installed, in converter tapping process, carbon dust, carbon dust are blown into tapping steel stream by carbon dust jet pipe
It reacts with the dissolved oxygen [O] in molten steel and generates CO.
10. the pre-deoxidation method that carbon dust is blown in converter taphole as is described in the claims, it is characterised in that converter smelting
After the completion of refining, carbon content and oxygen content in converter smelting endpoint molten steel are detected using sublance, molten steel composition and temperature are qualified
Afterwards, tapping steel, rocking-turn converter body are carried out, powder spraying system leads to argon gas only for argon gas is answered, keeps in jet pipe that is, in overall channel
2~3 atmospheric pressure of argon pressure, reaching prevents tapping steel stream from pouring in down a chimney to the effect for the carbon dust jet pipe being embedded in the tapping hole layer of resistance to material
Fruit, after steel stream is shown in tapping, the mixture of powder spraying system supply argon gas and carbon dust, [C] in converter smelting endpoint molten steel,
Carbon content in the content and molten steel subject component of [O] determines carbon dust straying quatity, during being blown carbon dust, keeps in jet pipe 4
Argon pressure for 2~3 atmospheric pressure, carbon dust and the dissolved oxygen [O] in molten steel react generation CO.
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| CN109880965A (en) * | 2019-04-24 | 2019-06-14 | 东北大学 | A device and method for spraying powder and dephosphorizing above a converter tap hole and simultaneously realizing slag blocking |
| CN112226576A (en) * | 2020-09-27 | 2021-01-15 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Device and method for carbon spraying deoxidation by using slag stopping system |
| CN113832286A (en) * | 2021-09-17 | 2021-12-24 | 东北大学 | A device, method and composite dephosphorization agent for powder spraying and dephosphorization at the tap hole of converter, and slag blocking at the same time |
| CN114012069A (en) * | 2021-10-15 | 2022-02-08 | 胡克潮 | Channel type metal solid-liquid mixing injection device and suspension casting method thereof |
| CN116103467A (en) * | 2023-04-14 | 2023-05-12 | 山西建龙实业有限公司 | Novel low-carbon aluminum-containing steel deoxidization alloying method |
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| CN113832286A (en) * | 2021-09-17 | 2021-12-24 | 东北大学 | A device, method and composite dephosphorization agent for powder spraying and dephosphorization at the tap hole of converter, and slag blocking at the same time |
| CN114012069A (en) * | 2021-10-15 | 2022-02-08 | 胡克潮 | Channel type metal solid-liquid mixing injection device and suspension casting method thereof |
| CN116103467A (en) * | 2023-04-14 | 2023-05-12 | 山西建龙实业有限公司 | Novel low-carbon aluminum-containing steel deoxidization alloying method |
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