CN108796163A - It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point - Google Patents
It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point Download PDFInfo
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- CN108796163A CN108796163A CN201810608833.4A CN201810608833A CN108796163A CN 108796163 A CN108796163 A CN 108796163A CN 201810608833 A CN201810608833 A CN 201810608833A CN 108796163 A CN108796163 A CN 108796163A
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- China
- Prior art keywords
- fire point
- high temp
- jet impulse
- utilize
- molten bath
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Classifications
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- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/30—Regulating or controlling the blowing
-
- 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
- C21C5/00—Manufacture of carbon-steel, e.g. plain mild steel, medium carbon steel or cast steel or stainless steel
- C21C5/28—Manufacture of steel in the converter
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
- C21C5/4606—Lances or injectors
- C21C5/462—Means for handling, e.g. adjusting, changing, coupling
Abstract
The present invention relates to process for making technical field more particularly to it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point is suitable for 30~400t convertor steelmaking process.According to the process of bessemerizing, it is based on molten bath metallurgy response feature, passes through CO in dynamic regulation blowing gas at times2Ratio utilizes CO2Pyroreaction characteristic, Primary period reduces fire point heat radiation, the mid-term that blows strengthens melting bath stirring, matter and energy between fire point and molten bath is accelerated to transmit, it blows latter stage, it prevents molten steel peroxidating, improve recovery rate of iron, oxygen rifle jet impulse area's Temperature Distribution and fire point volume during realization control is bessemerized, and then improve metallurgical effect.
Description
Technical field
The present invention relates to process for making technical field more particularly to it is a kind of utilize CO2Control converter oxygen gun jet impulse area
The method of high temp fire point.
Background technology
Due to physicochemical change extremely complex inside converter, the severe limit for smelting environment and current research means
The reasons such as system, are rarely reported the research in terms of converter oxygen gun jet impulse area high temp fire point, practitioner can only be by converter
As "black box" system, the relationship of analysis converter material, energy and momentum input and outlet chamber carries out fuzzy control.
On the other hand, with the development of efficient smelting technique, the oxygen supply intensity of convertor steelmaking process is continuously increased, high intensity
Oxygen jet be in direct contact converter molten pool, in jet impulse area, strong metallurgical exothermic reaction causes heat to sharply increase, by
The limitation of steelmaking melting pool of converter transient state heat absorption capacity, jet impulse area heat are difficult to be released effectively, and generate 2700 DEG C or more of height
Warm fire point area, while causing a large amount of iron to evaporate, fire point high temperature heat radiation is serious, and a large amount of surplus heat has little time to pass into
Bath, and as flue gas is discharged, cause the huge waste of converter input energy.
For a long time, the control in converter high temp fire point area is all therefore how the global problem that iron and steel enterprise faces leads to
Rational technological operation means research and control converter oxygen gun jet stream high temp fire point area are crossed, realizes high temp fire point area heat generation-
The homeostasis energy of transmission-molten bath heat absorption, improving the areas Huo Dian and bath energy utilization efficiency becomes steel industry urgently
Problem to be solved.
Invention content
In view of the above-mentioned problems, present invention proposition is a kind of to utilize CO2Control the side of converter oxygen gun jet impulse area high temp fire point
Method is based on molten bath metallurgy response feature, passes through CO in dynamic regulation blowing gas at times2Ratio, Primary period utilize CO2It is high
Warm response characteristic inhibits Si, Mn exothermic heat of reaction, reduces fire point heat radiation, and the blowing middle and later periods accelerates substance and energy between fire point and molten bath
Amount is transmitted, and is reduced flue gas and is taken away heat loss caused by heat, oxygen rifle jet impulse area temperature during being bessemerized to control
Distribution and fire point volume, reach reduction thermal loss, improve the purpose of capacity usage ratio.
To achieve the above object, the invention is realized by the following technical scheme：
It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point, this method are based on converter molten pool smelting
Golden response feature passes through CO in dynamic regulation blowing gas at times2Ratio utilizes CO2Physics and pyroreaction characteristic, each
Stage completes blowing task, to reach the mesh of oxygen rifle jet impulse area's Temperature Distribution and fire point volume during control is bessemerized
's.In Primary period, CO in blowing gas is controlled2Ratio 10~20%, by oxygen rifle jet impulse area shared by high temp fire point volume
Ratio control 20~30%, meet molten bath be rapidly heated, slugging while, effectively inhibit Si, Mn exothermic heat of reaction, reduce fire
Point heat radiation, if high temp fire point volume accounting is more or less than the range, it will cause converter self-energy surplus or energy are insufficient
The problems such as；In blowing mid-term, CO in blowing gas is controlled2Ratio 3~10%, by oxygen rifle jet impulse shared by high temp fire point volume
Area's ratio control strengthens melting bath stirring 20~40%, accelerates matter and energy between fire point and molten bath to transmit, reduces flue gas and take away
Heat loss caused by heat, if high temp fire point volume accounting is more than 40%, flue gas will take away a large amount of surplus heats, cause heat waste
It loses, if high temp fire point volume accounting is less than 20%, melting bath stirring is excessively strong, and molten steel heating energy supply is insufficient, influences smelting
Refine rhythm；3) it blows latter stage, controls CO in blowing gas2Ratio 10~30% rushes oxygen rifle jet stream shared by high temp fire point volume
Area's ratio control is hit 5~10%, while meeting terminal molten steel temperature, phosphorus content technological requirement, further increases metal
Recovery rate promotes quality of molten steel, if high temp fire point volume accounting is more than jet impulse area 10%, it will cause molten steel peroxidating,
If its accounting is less than 5%, converter terminal temperature is difficult to reach normal level.
The present invention includes the following steps：
Step 1：Primary period in i.e. 0~5min of duration of blast, executes that steps are as follows：Oxygen rifle is dropped to away from molten steel face 1.6
~2.2m controls CO2Injection ratio 10~20%, oxygen rifle 0.8~0.95MPa of supply gas pressure, starts to blow, and is ensureing that molten bath is fast
While speed heating, slugging, CO is utilized2Pyroreaction characteristic inhibits molten bath elements Si, Mn oxidation heat liberations, controls high temp fire point
Area's volume accounting reduces fire point heat radiation.
Step 2：In the blowing mid-term, i.e. 5~13min of duration of blast, steps are as follows for execution：Oxygen rifle is dropped to away from steel
1.2~1.8m of liquid level, converting process reduce CO2Injection ratio continues to blow, utilizes CO to 3~10%2Twice of generation is reacted with C
Volume CO accelerates bath matter and energy convection current to strengthen melting bath stirring, reduces the heat that flue gas is taken away, and reduces heat waste
It loses.
Step 3：After the blowing later stage, i.e. duration of blast 13min, steps are as follows for execution：Oxygen rifle is promoted to away from molten steel
1.7~2.2m of face controls CO in blowing gas2Ratio 10~30% blows, and by detection means such as sublance detections, completes
Blowing end point controls, and molten bath carbon content is relatively low at this time, utilizes CO2Weak oxide reduces O2The other element thermal discharges in molten bath are aoxidized,
Further increase recovery rate of iron.
Further, oxygen rifle jet impulse area volume approximate calculation method is：WhereinFor jet stream and radius of circle when molten bath contact；It is rushed for jet stream
Hit depth；
Further, high temp fire point area refers to the region that temperature is higher than 2100 DEG C.The blowing gas is to utilize gas
Body static mixer is by O2With CO2Mixing, CO when mixing2Gas pressure is higher than O20.1~0.2MPa of pressure ensures O2With CO2It is mixed
Uniformity coefficient >=99% of conjunction.
The present invention is suitable for 30~400t converter steelmaking processes.Oxygen lance spraying is utilized during bessemerizing through the invention
Blow certain proportion CO2Gas, Primary period inhibit molten bath elements Si, Mn oxidation heat liberations, control high temp fire point area volume accounting,
Reduce fire point heat radiation；Blow mid-term, utilizes CO2It is reacted with C and generates two volumes CO, to strengthen melting bath stirring, accelerate molten bath
Inner material and the convection of energy；It blows the later stage, prevents molten steel peroxidating, further increase recovery rate of iron.Control converter high temperature
Fire point volume account for jet impulse area to 40% hereinafter, converter gas temperature reduce by 50~110 DEG C, convert into mark coal 0.08~
0.18kgce/t steel, ton steel gas volume increase by 5~10m3, mark coal 2.16~4.32kgce/t steel is converted into, CO is dense in coal gas of converter
Degree improves 3~8%, reduces the waste of molten bath energy surplus, improves energy utilization efficiency.
Description of the drawings
Fig. 1 is 1 blowing gas flow diagram of embodiment.
Fig. 2 is 2 blowing gas flow diagram of embodiment.
Specific implementation mode
In order to make the purpose , technical scheme and advantage of the present invention be clearer, with reference to embodiments, to the present invention
It is explained in further detail.It should be appreciated that specific embodiment described herein is used only for explaining the present invention, it is not used to
Limit the present invention.
On the contrary, the present invention covers any replacement done in the spirit and scope of the present invention being defined by the claims, repaiies
Change, equivalent method and scheme.Further, in order to make the public have a better understanding the present invention, below to the thin of the present invention
It is detailed to describe some specific detail sections in section description.Part without these details for a person skilled in the art
Description can also understand the present invention completely.
Embodiment 1：
The present invention is applied to 150t convertor steelmaking process, using statical mixer of gases by CO2With O2Uniformly mixing, simultaneously
CO can be achieved2The dynamic regulation of mixed proportion, O2-CO2Mixed injection total flow is 34000Nm3/ h, monitors converter gas in real time
Temperature.
1) before blowing starts, using statical mixer of gases, by CO2With O2It is premixed, ensures that bleed pressure and flow are steady
It is fixed；
2) Primary period, i.e. in 0~5min of duration of blast, oxygen rifle is dropped to away from molten steel face 1.6m, controls CO2Injection ratio
15%, oxygen rifle supply gas pressure 0.9MPa start to blow, ensure molten bath be rapidly heated, slugging while, inhibit molten bath elements Si,
Mn oxidation heat liberations reduce fire point heat radiation.
3) in 5~11min of duration of blast, oxygen rifle is continued to drop to away from molten steel face 1.2m by 1.6m, and converting process reduces CO2
Injection ratio continues to blow to 5%, to strengthen melting bath stirring, accelerates bath matter and energy convection current.
4) blowing is promoted to by 1.2m away from molten steel face 1.7m to 11~14min, oxygen rifle, controls CO in blowing gas2Ratio
18% blows, by carrying rifle, increasing CO2Blowing task is completed in the operations such as mixing proportion, sublance detection molten steel component, is prevented
Molten steel peroxidating improves recovery rate of iron.
5) O is closed2With CO2Steam supply valve hinders, until next stove blows.
After the method for the invention, during bessemerizing 14min, flue-gas temperature averagely declines 73 DEG C, ton steel coal
Gas yield increases 6.4m3, CO concentration averagely increases by 5% (percentage by volume) in coal gas.
Embodiment 2：
The present invention is applied to 300t convertor steelmaking process, using statical mixer of gases by CO2With O2Uniformly mixing, simultaneously
CO can be achieved2The dynamic regulation of injection ratio, O2-CO2Mixed injection total flow is 58000Nm3/ h, monitors converter gas in real time
Temperature.
1) before blowing starts, using statical mixer of gases by CO2With O2Uniformly mixing ensures that bleed pressure and flow are steady
It is fixed；
2) in 0~6min of duration of blast, oxygen rifle is dropped to away from molten steel face 1.8m, controls CO2Injection ratio 14%, oxygen rifle supply
Atmospheric pressure 0.92MPa starts to blow, ensure molten bath be rapidly heated, slugging while, inhibit molten bath elements Si, Mn oxidation heat liberations,
Reduce fire point heat radiation；
3) blowing starts in 6~12min, and oxygen rifle continues to drop to away from molten steel face 1.5m, and converting process reduces CO2Injection ratio
Example continues to blow to 4%, to strengthen melting bath stirring, accelerates bath matter and energy convection current.
4) blowing is to 12~16min, and oxygen rifle is promoted to away from molten steel face 1.9m, which increases CO2Injection ratio to 20%,
By carrying rifle, increasing CO2Blowing task is completed in the operations such as mixing proportion, sublance detection molten steel component, is prevented molten steel peroxidating, is carried
High metal recovery rate.
5) O is closed2With CO2Steam supply valve hinders, until next stove blows.
After the method for the invention, during bessemerizing 16min, flue-gas temperature averagely declines 87 DEG C, ton steel coal
Gas yield increases 7.2m3, CO concentration averagely increases by 4% (percentage by volume) in coal gas.
Claims (7)
1. a kind of utilizing CO2The method for controlling converter oxygen gun jet impulse area high temp fire point, which is characterized in that be based on pneumatic steelmaking
Molten bath metallurgy response feature passes through CO in dynamic regulation blowing gas at times2Ratio, oxygen rifle is penetrated during control is bessemerized
Flow impact zone Temperature Distribution and fire point volume；
Ratio control in oxygen rifle jet impulse area shared by high temp fire point area volume is being met molten bath by Primary period 20~30%
Be rapidly heated, slugging while, effectively inhibit Si, Mn exothermic heat of reaction, reduce fire point heat radiation；
Blow mid-term, and ratio control in oxygen rifle jet impulse area shared by high temp fire point area volume is being met molten bath 20~40%
While decarburization, heating, strengthen melting bath stirring, accelerates matter and energy between fire point and molten bath to transmit, reduce flue gas and take away heat
Caused by heat loss；
It blows latter stage, ratio control in oxygen rifle jet impulse area shared by high temp fire point area volume is being met into terminal steel 5~10%
While liquid temperature, phosphorus content technological requirement, recovery rate of iron is improved, promotes quality of molten steel.
2. a kind of as described in claim 1 utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point, feature behaviour
Steps are as follows for work：
Step 1：In the Primary period, i.e. 0~5min of duration of blast, ensure molten bath be rapidly heated, slugging while, inhibit
Molten bath element oxide heat release reduces fire point heat radiation, and control high temp fire point area volume, steps are as follows for execution：Oxygen rifle drop to away from
1.6~2.2m of molten steel face controls CO2Injection ratio 10~20%, oxygen rifle 0.8~0.95MPa of supply gas pressure, starts to blow；
Step 2：In the blowing mid-term, i.e. 5~13min of duration of blast, CO is utilized2Pyroreaction characteristic strengthen molten bath stir
It mixes, accelerates bath matter and energy convection current, reduce the heat that flue gas is taken away, steps are as follows for execution：Oxygen rifle is dropped to away from steel
1.2~1.8m of liquid level, converting process reduce CO2Injection ratio continues to blow to 3~10%；
Step 3：After the blowing later stage, i.e. duration of blast 13min, CO is utilized2Weak oxide reduces O2Aoxidize molten bath element
Thermal discharge, steps are as follows for execution：Oxygen rifle is promoted to away from 1.7~2.2m of molten steel face, controls CO in blowing gas2Ratio 10~30%
It blows, detection means is detected by sublance, complete blowing end point control.
3. it is according to claim 1 or 2 it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point,
It is characterized in that, high temp fire point area refers to the region that temperature is higher than 2100 DEG C.
4. it is according to claim 1 or 2 it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point,
It is characterized in that, oxygen rifle jet impulse area volume approximate calculation method is：WhereinFor jet stream and radius of circle when molten bath contact；It is rushed for jet stream
Hit depth；In formula, ρGo outFor oxygen rifle exit gas density, kg/m3；ρsMolten steel density, kg/m3；ωGo outFor jet exit velocity, m/s；
dGo outFor jet exit diameter, m；H is blowing rifle position, m；β is constant, is decided by jet stream Mach number, takes β=8；G accelerates for gravity
Degree, m2/s。
5. it is according to claim 1 or 2 it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point,
It is characterized in that：The blowing gas is to utilize statical mixer of gases by O2With CO2Mixing, CO when mixing2Gas pressure is higher than O2
0.1~0.2MPa of pressure ensures O2With CO2Mixed uniformity coefficient >=99%.
6. it is according to claim 1 or 2 it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point,
It is characterized in that：The method is suitable for molten iron of the temperature higher than 1250 DEG C and blows.
7. it is according to claim 1 or 2 it is a kind of utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point,
It is characterized in that：The method is suitable for 30~400t convertor steelmaking process.
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| CN201810608833.4A CN108796163B (en) | 2018-06-13 | 2018-06-13 | It is a kind of to utilize CO2The method for controlling converter oxygen gun jet impulse area high temp fire point |
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| CN110628983A (en) * | 2019-10-10 | 2019-12-31 | 北京科技大学 | Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method |
| CN110804684A (en) * | 2019-10-16 | 2020-02-18 | 北京科技大学 | CO converter2-O2Dynamic control method for temperature of mixed blowing smelting fire point area |
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| CN110628983A (en) * | 2019-10-10 | 2019-12-31 | 北京科技大学 | Converter smelting fire point area temperature continuous monitoring oxygen lance system and monitoring method |
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