CN106167844B - A kind of bottom blowing mode autocontrol method of combined blown converter - Google Patents
A kind of bottom blowing mode autocontrol method of combined blown converter Download PDFInfo
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- CN106167844B CN106167844B CN201610741393.0A CN201610741393A CN106167844B CN 106167844 B CN106167844 B CN 106167844B CN 201610741393 A CN201610741393 A CN 201610741393A CN 106167844 B CN106167844 B CN 106167844B
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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
- C21C5/35—Blowing from above and through the bath
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Abstract
The invention discloses a kind of bottom blowing mode control methods of combined blown converter, control method is for the iron making stage in combined blown converter, the blowing stage, the stage of falling slag, point blows the stage, thermometric sample phase, loitering phase, tapping stage and the botton blowing operation for splashing the slag stage are controlled, for different steel types and endpoint carbon content range, to the Bottom Blowing source category in each stage botton blowing operation, air supply intensity, gassing time is adjusted, obtain corresponding bottom blowing mode, and the control button of corresponding different bottom blowing modes is set in control system operation interface, bottom blowing mode is selected by clicking control button.The present invention is by increasing converting process each stage, each supply gas pressure mode the Automation Design and application for reacting the phase, effectively improve the dynamic conditions of existing converter molten pool, improve the uniformity of converter terminal molten bath ingredient and the stability of temperature, blown converter number after reduction, reduce blow loss, and reduce the magnesia material additional amount of furnace retaining, save resistance to material cost.
Description
Technical field
The present invention relates to converter steeling technology field, the bottom blowing mode autocontrol method of specifically a kind of combined blown converter.
Background technique
Converter is at present using most common steelmaking equipment, and it is main former that pneumatic steelmaking, which is with molten iron, steel scrap, ferroalloy,
Material, not by external energy, chemical reaction generates heat and complete in converter between the physical thermal and iron liquid component of iron liquid itself
At steelmaking process.Mainly there are oxygen top-blown converter, top and bottom combined blown converter etc..
For top and bottom combined blown converter, the application more generally technique of top blowing oxygen, bottom blowing inert gas at present.It is right
In the technique, as converting process carries out, can successively occur silicomanganese reaction phase, reaction between carbon and oxygen initial phase, carbon oxygen inside Converter
React different reaction phase such as violent phase, reaction between carbon and oxygen latter stage, in the converter of differential responses phase due to oxygen top blown and formed
Dynamic conditions be different.The air demand of existing bottom-blowing of converter control model is single, leads to the power in differential responses period
It is big to learn conditional fluctuation, so that occurring that silicomanganese reaction phase dynamic conditions is insufficient, the slow phenomenon of initial stage slag making, slagging occurs,
And in the reaction between carbon and oxygen violent phase since dynamic conditions is too big, and will appear carrying range of the steel-slag blanket beyond design heat size ratio
The phenomenon that, greatly increase the excessive probability with metallicity splash of steel slag.Simultaneously as the dynamic conditions of converter terminal it is insufficient and
Cause endpoint molten steel oxidisability uneven, molten steel carbon component is uneven.For mild steel, in the case where furnace bottom rising, do not have
There is good blowing later period dynamic conditions, so that the fluctuation of finished product carbon content is big, after-blow heat is caused to increase, iron loss increases, and adds
Expenses of labour increases.
Therefore, it is necessary to the bottom blowing modes to combined blown converter to be adjusted, to adapt to different smelting condition and process requirements.
Summary of the invention
The technical problem to be solved by the invention is to provide a kind of bottom blowing mode autocontrol methods of combined blown converter, pass through
The bottom blowing gas pressure pattern in each stage, each reaction phase is targetedly set, and carries out the Automation Design and application, realizes and turns
The stable operation of furnace, it is ensured that rhythm of production is smooth, reduces the labor intensity of maintenance working of a furnace cost and personnel.
In order to solve the above technical problems, the technical scheme adopted by the invention is that:
A kind of bottom blowing mode control method of combined blown converter, the control method in combined blown converter the iron making stage,
Blowing stage, the stage of falling slag, point blow stage, thermometric sample phase, loitering phase, tapping stage and the bottom blowing work for splashing the slag stage
Industry is controlled, for different steel types and endpoint carbon content range, in each stage botton blowing operation Bottom Blowing source category,
Air supply intensity, gassing time are adjusted, and obtain corresponding bottom blowing mode, and are arranged in control system operation interface and are corresponded to not
With the control button of bottom blowing mode, bottom blowing mode is selected by clicking control button.
Technical solution of the present invention further improvement lies in that: the bottom blowing gas source be nitrogen or argon gas, the quantity of bottom blowing gun
It is 3~6.
Technical solution of the present invention further improvement lies in that: the bottom blowing gas intensity be 0.02m3/ (tmin)~
0.1m3/(t·min)。
Technical solution of the present invention further improvement lies in that: the endpoint carbon content range be divided into carbon content < 0.10%,
0.20% 3 0.10%≤carbon content≤0.20%, carbon content > range.
Technical solution of the present invention further improvement lies in that: the control method in combined blown converter each stage it is specific
Control is,
1) the iron making stage selects Bottom Blowing source category, adjusts air supply intensity, carries out this stage according to the gassing time of setting
Botton blowing operation；
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node, selects Bottom Blowing source category, adjust
Air supply intensity carries out the botton blowing operation in this stage according to the gassing time of setting；
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, selects Bottom Blowing source category, adjust
Air supply intensity carries out the botton blowing operation in this stage according to the gassing time of setting；
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, selects Bottom Blowing source category,
Air supply intensity is adjusted, the botton blowing operation in this stage is carried out according to the gassing time of setting；
5) thermometric sample phase after the completion of point blows the stage, to start sublance as switching node, selects Bottom Blowing source category,
Air supply intensity is adjusted, the botton blowing operation in this stage is carried out according to the gassing time of setting；
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, selects Bottom Blowing source category,
Air supply intensity is adjusted, the botton blowing operation in this stage is carried out according to the gassing time of setting；
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, select bottom blowing gas source kind
Class adjusts air supply intensity, the botton blowing operation in this stage is carried out according to the gassing time of setting；
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, selects bottom blowing gas source
Type adjusts air supply intensity, carries out splashing slag operation, splash after the completion of slag operation, converter enters next round bottom blowing control process.
Technical solution of the present invention further improvement lies in that: the blowing stage of the step 2) include several height controlled
Journey, the sub- control process are divided and are controlled using gassing time as node.
Technical solution of the present invention further improvement lies in that: the stage of falling slag and point blow and subsequent blowing are arranged between the stage
And/or thermometric sample phase, the process conditions of the subsequent blowing are identical as the process conditions of blowing.
Technical solution of the present invention further improvement lies in that: the control method is stirred operation mode and is being operated after further including
Be arranged on interface it is corresponding after stir button, stirred after described operation air supply intensity be 0.09m3/ (tmin), stirs operation after described
The latter stage for a little blowing the stage is set.
By adopting the above-described technical solution, the technological progress achieved by the present invention is:
The present invention reacts the supply gas pressure mode the Automation Design and application of phase by increase converting process each stage, respectively,
Effectively improve the dynamic conditions of existing converter molten pool, improves the uniformity of converter terminal molten bath ingredient and the stabilization of temperature
Property, blown converter number after reduction reduces blow loss, and reduces the magnesia material additional amount of furnace retaining, saves resistance to material cost.It reduces in year and blows
Damage and save about 1,000,000 yuan of synergy of magnesia material.The present invention is also achieved docks with the perfection of former bottom blowing equipment (containing gas piping).
The present invention is for silicomanganese reaction phase, reaction between carbon and oxygen initial phase, reaction between carbon and oxygen violent phase, reaction between carbon and oxygen latter stage in converter
Each stage, set segmentation gas supply transformation automatic control system, can be improved production operation efficiency, reduce blow loss, reduce into
Furnace magnesia material, promotes converter terminal stability at control cost, it is ensured that rhythm of production is smooth, reduces maintenance working of a furnace cost and personnel
Labor intensity.
The present invention is suitable for prestressing force steel, carbon steel, cord class, bearing class, the bottom blowing mode of special cold-heading class steel
Control, by setting automatic mode process control, worker is just simple by computer selection " mode ", accurately completes correspondence
The model selection of steel grade eliminates valve conversion, all too many levels that valve opening is adjusted, gas pressure confirms, reduces worker
Labor intensity, reduce maintenance time and the labor intensity of maintenance personal, improve 3 times of upkeep operation efficiency or more, steel-making
Process steel technology sharp fall enters furnace charge reduction, has greatly saved cost.
Specific embodiment
A kind of bottom blowing mode control method of combined blown converter disclosed by the invention, control method is for converting in combined blown converter
Iron stage, blowing stage, the stage of falling slag, point blow stage, thermometric sample phase, loitering phase, tapping stage and splash the slag stage
Botton blowing operation controlled, for different steel types and endpoint carbon content range, to the bottom blowing in each stage botton blowing operation
Gas source type, air supply intensity, gassing time are adjusted, and obtain corresponding bottom blowing mode, and in control system operation interface
The control button of corresponding different bottom blowing modes is set, selects bottom blowing mode by clicking control button.
For the bottom blowing gas source that the present invention uses for nitrogen or argon gas, the quantity of bottom blowing gun is 3~6.Specific feelings can also be regarded
Condition selects other kinds of gas.Bottom blowing gas intensity is 0.02m3/ (tmin)~0.1m3/(t·min)。
The endpoint carbon content range that the present invention is directed to be divided into carbon content < 0.10%, 0.10%≤carbon content≤0.20%,
0.20% 3 range of carbon content >.
The present invention is described in further details below with reference to embodiment:
Embodiment 1
The present embodiment is directed to common ER class steel, and endpoint carbon content < 0.10% is denoted as Mode A.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node, does not switch gas source type, continue to select
Nitrogen is selected as bottom blowing gas source.
The blowing stage of the present embodiment includes 3 sub- control processes, and it is 0.07m that the first subprocess, which adjusts air supply intensity,3/
(tmin), it is 0.05m that the second subprocess, which adjusts air supply intensity,3/ (tmin), third subprocess adjust air supply intensity and are
0.07m3/ (tmin), sub- control process are divided by node of the time, the gassing time between subprocess be 5min and
6min successively carries out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, does not switch gas source type, continue to select
Nitrogen is selected as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time be 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, does not switch gas source type, after
It is continuous to select nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
Blow latter stage in stage in point, button stirred after click, operation is stirred after starting, at this time air supply intensity be converted to for
0.09m3/ (tmin) is conducive to subsequent tapping steel to improve the dynamic conditions of existing converter molten pool.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.03mm3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, does not switch gas source kind
Class continues to select nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage
Gassing time be 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
It can be blown as needed in the stage of falling slag and point in the present embodiment and subsequent blowing is set between the stage, the work of subsequent blowing
Skill condition is identical as the process conditions of blowing.
Embodiment 2
The present embodiment is directed to specially offered ER class steel, and endpoint carbon content < 0.10% is denoted as Mode B.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node.The blowing stage of the present embodiment includes
3 sub- control processes, it is 0.07m that the first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Nitrogen is as bottom blowing gas source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, selects argon
Gas is as bottom blowing gas source；It is 0.07m that third subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Argon gas is selected as bottom blowing gas source；Sub- control process is divided by node of the time, and the gassing time between subprocess is 5min
And 6min, successively carry out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, does not switch gas source type, continue to select
Argon gas is selected as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time be 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source kind
Class selects nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage blows
The gas time is 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
It can be blown as needed in the stage of falling slag and point in the present embodiment and subsequent blowing is set between the stage, the work of subsequent blowing
Skill condition is identical as the process conditions of blowing.
In operation it is noted that in the operation of switching gas source type, when gas is converted, it is desirable that subsequent gases valve opening 3
After second, it could be closed by converted gas valve.
Embodiment 3
The present embodiment is directed to high-end low-carbon class steel, and endpoint carbon content < 0.10% is denoted as mode C.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node.The blowing stage of the present embodiment includes
4 sub- control processes, it is 0.07m that the first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Nitrogen is as bottom blowing gas source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, selects argon
Gas is as bottom blowing gas source；It is 0.05m that third subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Argon gas is selected as bottom blowing gas source；It is 0.07m that 4th subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source；Sub- control process is divided by node of the time, the gassing time between subprocess
3min, 2min and 6min successively carry out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, does not switch gas source type, continue to select
Argon gas is selected as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time be 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source kind
Class selects nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage blows
The gas time is 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
Setting thermometric sample phase between the stage can be blown in the stage of falling slag and point as needed in the present embodiment, select argon gas
As bottom blowing gas source.The gassing time in this stage is 3min.
In operation it is noted that in the operation of switching gas source type, when gas is converted, it is desirable that subsequent gases valve opening 3
After second, it could be closed by converted gas valve.
Embodiment 4
The present embodiment is directed to number steel, rigid line class steel, and endpoint carbon content > 0.20% is denoted as mode D.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node.The blowing stage of the present embodiment includes
4 sub- control processes, it is 0.07m that the first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Nitrogen is as bottom blowing gas source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin) does not switch gas source type, continues
Select nitrogen as bottom blowing gas source；It is 0.05m that third subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, choosing
Argon gas is selected as bottom blowing gas source；It is 0.06m that 4th subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source；Sub- control process is divided by node of the time, the gassing time between subprocess
5min, 4min and 2min successively carry out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, switches gas source type, select nitrogen
As bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin) carries out the botton blowing operation in this stage, the air blowing in this stage
Time is 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, switches gas source type, selection
Argon gas is as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time is 1min.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source kind
Class selects nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage blows
The gas time is 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
Setting thermometric sample phase between the stage can be blown in the stage of falling slag and point as needed in the present embodiment, select argon gas
As bottom blowing gas source.The gassing time in this stage is 3min.
In operation it is noted that in the operation of switching gas source type, when gas is converted, it is desirable that subsequent gases valve opening 3
After second, it could be closed by converted gas valve.
Embodiment 5
The present embodiment is directed to DA class, 82B class, cold-forging steel class steel, and terminal 0.10%≤carbon content≤0.20% is denoted as mould
Formula E.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node.The blowing stage of the present embodiment includes
4 sub- control processes, it is 0.07m that the first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Nitrogen is as bottom blowing gas source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin) does not switch gas source type, continues
Select nitrogen as bottom blowing gas source；It is 0.05m that third subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, choosing
Argon gas is selected as bottom blowing gas source；It is 0.06m that 4th subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source；Sub- control process is divided by node of the time, the gassing time between subprocess
5min, 4min and 2min successively carry out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, switches gas source type, select nitrogen
As bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin) carries out the botton blowing operation in this stage, the air blowing in this stage
Time is 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, switches gas source type, selection
Argon gas is as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time is 1min.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source kind
Class selects nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage blows
The gas time is 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
Setting thermometric sample phase between the stage can be blown in the stage of falling slag and point as needed in the present embodiment, select argon gas
As bottom blowing gas source.The gassing time in this stage is 3min.
In operation it is noted that in the operation of switching gas source type, when gas is converted, it is desirable that subsequent gases valve opening 3
After second, it could be closed by converted gas valve.
Embodiment 6
The present embodiment be directed to cord class, bearing class, special cold-forging steel class steel, 0.10%≤carbon content of terminal≤
0.20%, it is denoted as model F.
Each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control into
The botton blowing operation in this stage of row, the gassing time in this stage are 5min；This stage, which normally starts from, splashed after the slag stage, specifically
Start from splashing after slag stopping bottom blowing.
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node.The blowing stage of the present embodiment includes
4 sub- control processes, it is 0.07m that the first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Nitrogen is as bottom blowing gas source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, selects argon
Gas is as bottom blowing gas source；It is 0.05m that third subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select
Argon gas is selected as bottom blowing gas source；It is 0.06m that 4th subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source；Sub- control process is divided by node of the time, the gassing time between subprocess
3min, 2min and 6min successively carry out the botton blowing operation in this stage.
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, switches gas source type, select nitrogen
As bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin) carries out the botton blowing operation in this stage, the air blowing in this stage
Time is 3min.
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, switches gas source type, selection
Argon gas is as bottom blowing gas source.Adjusting air supply intensity is 0.07m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time is 1min.
5) thermometric sample phase, to start sublance as switching node, does not switch gas source type after the completion of point blows the stage, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 3min.
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.03m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 1min.
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source kind
Class continues to select argon gas as bottom blowing gas source.Adjusting air supply intensity is 0.025m3/ (tmin), the bottom blowing for carrying out this stage are made
Industry, the gassing time in this stage are 5min.
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source kind
Class selects nitrogen as bottom blowing gas source.Adjusting air supply intensity is 0.10m3/ (tmin) carries out splashing slag operation, this stage blows
The gas time is 3min.It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
Setting thermometric sample phase between the stage can be blown in the stage of falling slag and point as needed in the present embodiment, select argon gas
As bottom blowing gas source.The gassing time in this stage is 3min.
In operation it is noted that in the operation of switching gas source type, when gas is converted, it is desirable that subsequent gases valve opening 3
After second, it could be closed by converted gas valve.
Above-mentioned six kinds of modes cover common ER class steel, specially offered ER class steel, high-end low-carbon class steel, number steel, rigid line
Class steel, DA class, 82B class, cold-forging steel class steel, cord class, bearing class, special cold-forging steel class steel etc., by six kinds of above-mentioned A-F
Mode carries out automation control by control methods such as PLC, need to only select corresponding mode in operation, without being arranged with specific
Parameter greatly improves operating efficiency and accuracy.Realize excellent technical effect.
Claims (1)
1. a kind of bottom blowing mode control method of combined blown converter, it is characterised in that be directed to number steel, rigid line class steel, endpoint carbon content
> 0.20%, each stage of control process specifically:
1) the iron making stage selects nitrogen as bottom blowing gas source, and adjusting air supply intensity is 0.05m3/ (tmin), control carry out this rank
The botton blowing operation of section, the gassing time in this stage are 5min；
2) it blows the stage, after the completion of the iron making stage, using oxygen supply by lance as switching node；The blowing stage includes 4 sub- control processes,
It is 0.07m that first subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select nitrogen as Bottom Blowing
Source；It is 0.05m that second subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continues to select nitrogen the bottom of as
Air blowing source；It is 0.05m that third subprocess, which adjusts air supply intensity,3/ (tmin) switches gas source type, selects argon gas as bottom blowing
Gas source；It is 0.06m that 4th subprocess, which adjusts air supply intensity,3/ (tmin), does not switch gas source type, continue to select argon gas as
Bottom blowing gas source；Sub- control process is divided by node of the time, gassing time 5min, 4min and 2min between subprocess,
Successively carry out the botton blowing operation in this stage；
3) stage of falling slag after the completion of the blowing stage, plays rifle as switching node using oxygen rifle, switches gas source type, select nitrogen as
Bottom blowing gas source；Adjusting air supply intensity is 0.025m3/ (tmin) carries out the botton blowing operation in this stage, the gassing time in this stage
For 3min；
4) point is blown the stage, after the completion of the stage of falling slag, with the secondary oxygen supply of oxygen rifle for switching node, is switched gas source type, is selected argon gas
As bottom blowing gas source；Adjusting air supply intensity is 0.07m3/ (tmin) carries out the botton blowing operation in this stage, the air blowing in this stage
Time is 1min；
5) thermometric sample phase to start sublance as switching node, does not switch gas source type, continues to select after the completion of point blows the stage
Argon gas is selected as bottom blowing gas source；Adjusting air supply intensity is 0.03m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time be 3min；
6) loitering phase after the completion of thermometric sample phase, plays rifle as switching node using sublance, does not switch gas source type, continue to select
Argon gas is selected as bottom blowing gas source；Adjusting air supply intensity is 0.03m3/ (tmin), carries out the botton blowing operation in this stage, this stage
Gassing time be 1min；
7) it taps the stage, after the completion of loitering phase, fascinates 55 degree backward using converter as switching node, do not switch gas source type, after
It is continuous to select argon gas as bottom blowing gas source；Adjusting air supply intensity is 0.025m3/ (tmin) carries out the botton blowing operation in this stage, this
The gassing time in stage is 5min；
8) it splashes the slag stage, after the completion of the tapping stage, vertical state is reset to as switching node using converter, switches gas source type, choosing
Nitrogen is selected as bottom blowing gas source；Adjusting air supply intensity is 0.10m3/ (tmin), splash slag operation, when the air blowing in this stage
Between be 3min；It splashes after the completion of slag operation, converter enters next round bottom blowing control process.
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| US10781499B2 (en) * | 2018-01-17 | 2020-09-22 | Air Products And Chemicals, Inc. | Bottom stirring tuyere and method for a basic oxygen furnace |
| CN111041150A (en) * | 2018-10-12 | 2020-04-21 | 上海梅山钢铁股份有限公司 | Control method for automatic slag splashing of converter |
| CN112725557A (en) * | 2020-12-25 | 2021-04-30 | 济南工程职业技术学院 | Converter bottom blowing intelligent control method |
| CN113005254A (en) * | 2021-02-23 | 2021-06-22 | 山东钢铁股份有限公司 | Unmanned intelligent steelmaking system and steelmaking method |
| CN112853033B (en) * | 2021-03-10 | 2023-10-13 | 柳州钢铁股份有限公司 | Efficient slag splashing intelligent control method and system based on furnace mouth image analysis |
| CN113462845B (en) * | 2021-05-27 | 2022-11-04 | 石钢京诚装备技术有限公司 | Method for controlling converter bottom height by adjusting bottom blowing parameters |
| CN114107609A (en) * | 2021-11-24 | 2022-03-01 | 江苏沙钢集团有限公司 | Gas injection process model for ladle refining |
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| CN1924027A (en) * | 2006-09-26 | 2007-03-07 | 山西太钢不锈钢股份有限公司 | Switching method for feeding nitrogen and argon of reblowing converter bottom |
| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
| CN104232834A (en) * | 2014-08-29 | 2014-12-24 | 武汉钢铁(集团)公司 | Mode-based converter steelmaking automatic control device and application method of automatic control device |
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| CN1924027A (en) * | 2006-09-26 | 2007-03-07 | 山西太钢不锈钢股份有限公司 | Switching method for feeding nitrogen and argon of reblowing converter bottom |
| CN102230052A (en) * | 2011-07-19 | 2011-11-02 | 莱芜钢铁股份有限公司 | Top-bottom combined blowing converter technology for high-carbon low-phosphor molten steel with single-slag process |
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