CN102234703B - On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method - Google Patents
On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method Download PDFInfo
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- CN102234703B CN102234703B CN 201010156196 CN201010156196A CN102234703B CN 102234703 B CN102234703 B CN 102234703B CN 201010156196 CN201010156196 CN 201010156196 CN 201010156196 A CN201010156196 A CN 201010156196A CN 102234703 B CN102234703 B CN 102234703B
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Abstract
The invention relates to an on-line thermal state cleaning method for accumulated burl on a mechanical desulfuration stirring paddle by using a knotted reactor (KR) method. The method is characterized by comprising the following steps: (1) adding molten iron to a hot metal ladle; (2) inserting a stirring paddle with accumulated burl into the molten iron, wherein the depth of the stirring paddle inserted into the molten iron is larger than or equal to 3990mm; (3) rotating the stirrer at an initial rotation speed, wherein the initial rotation speed is 20-30r/min; (4) adding a desulfurizer in the molten iron; (5) accelerating the rotation speed of the stirring paddle to the maximum rotation speed, wherein the maximum rotation speed is 85-95r/min; (6) maintaining the stirring paddle to operate at the maximum rotation speed; (7) decelerating until the stirring paddle stops rotating; and (8) taking out the stirring paddle so as to complete cleaning. According to the method, effective on-line thermal state cleaning can be carried out on adhered slag/stuck iron/accumulated burl on the KR stirring paddle; and the exchange time of the stirring paddle is effectively reduced, the service life of the stirring paddle is prolonged, and the manufacturing capability of a production line is improved.
Description
Technical field
The present invention relates to the hot metal in steelmaking preprocessing technical field, more particularly, relate to a kind of online hot method for cleaning of KR method machinery desulfurization stirring arm buildup
Background technology
Modern field of steel-making molten iron pretreatment method mainly contains blowing process and KR mechanical mixing method two classes; The mechanical mixing method desulfurization is the cross stirring arm that the anti-material cast of indefinite form is formed, after baking, insert in the quantitative molten iron and rotate, make molten iron produce whirlpool, then drop into a certain amount of sweetening agent to molten iron whirlpool district, make the sulphur in sweetening agent and the molten iron in constantly stirring, desulphurization reaction occur.And the characteristics of KR mechanical mixing method maximum are to have fabulous desulfurization kinetics condition, desulfurization degree high (〉=90%) and stable, and sweetening agent can be fully utilized.The last century initial stage of development was lacked (about～80 times) and is used less because of its mixing speed low (about～80r/min) and stirring arm life-span, through more than 30 years update, mixing speed is brought up to～150r/min, and the stirring arm Service life is to about～400 times.Cost is significantly reduced, and usefulness significantly rises.At home and abroad each big steel enterprise is generally adopted at present.
The pre-treatment of mechanical mixing method desulfurizing iron is able to again occupy an leading position at molten iron desulfurizing method, mainly relies on the raising in stirring arm life-span and the raising of stirring velocity.Now domestic and international iron and steel enterprise of the same type is large produces actual stirring arm mean life at 220～280 stoves/(Max ≈ 500 stoves); So the major cause of big-difference is that operation production capacity and scale and benefit are all pursued by each enterprise, and ignored the factor that affects the stirring arm Service life that stirring arm cleaning dry slag, sticking iron, buildup etc. originally can remedy, will drop to lower-most point for the unproductive activity duration that stirring arm is safeguarded and cause.
According to the open source information inquiry, all adopt at present the manual finishing mode that rolls off the production line to clear up the dry slag of stirring arm/sticking iron/buildup both at home and abroad.
Summary of the invention
The object of the invention is to: the online hot method for cleaning that a kind of KR method machinery desulfurization stirring arm buildup is provided, the online hot method for cleaning of described KR method machinery desulfurization stirring arm buildup, turn to front topic to pursue the unproductive upkeep operation minimal time of KR operation, to realize the online hot stirring arm dry slag/sticking iron/buildup cleaning of finishing.
The online hot method for cleaning of a kind of KR method machinery desulfurization stirring arm buildup of the present invention is design and the control by operating parameters, utilize blast-melted high-temperature physics thermal property to carry out the cleaning of dissolving of dry slag on the stirring arm/long-pending iron/buildup, realize the removing to desulfurization stirring arm slurry bar and paddle dry slag, long-pending iron, buildup; Thereby prolong the stirring arm life cycle, stable stirring arm work-ing life and the reduction cost of anti-material of improving; Reduce nonproductive working procedure duration, improve the operation manufacturing capacity.
Technical scheme of the present invention is as follows.
1. the online hot method for cleaning of KR method machinery desulfurization stirring rake buildup is characterized in that the concrete steps of described method are as follows:
(1) in hot metal ladle, adds molten iron;
(2) stirring rake with dross inserts molten iron, and described stirring rake inserts the degree of depth 〉=3990mm of molten iron;
(3) with initial speed of rotation Stirring oar, described initial speed of rotation is 20-30r/min;
(4) in molten iron, add sweetening agent;
(5) speed of rotation with stirring rake accelerates to high rotation speed, and described high rotation speed is 85-95r/min;
(6) keep stirring rake with high rotation speed operation 20-45min;
(7) being decelerated to stirring rake stops the rotation;
(8) propose stirring rake, finish cleaning.
As everyone knows, the iron water amount of splendid attire is more fixedly in the processing vessel of nominal capacity at one, and its liquid level value is just larger, and the amplitude of stirring arm depth of penetration is just larger.After the stirring arm of dross inserted molten iron and rotation, it is just fewer that the dross piece is exposed to airborne probability, and namely its suffered calorific value is just larger, and the effect of clear knurl is just better.So, require stirring rake descending depth 〉=3990mm, to satisfy the technical requirements of online hot clear knurl.
With initial speed of rotation Stirring oar, described initial speed of rotation is 20-30r/min about (3).
According to law of Archimedes, after stirring arm inserted molten iron, molten iron level can produce rising; And after stirring arm begins rotation, around the slurry heart, can produce a vortex, and have a rising value at the molten iron level near hot metal ladle bag wall place, the speed of rotation is faster, and the molten iron level rising value is just larger.
For the stirring arm of dross, because the variation of its profile, will in hot metal ladle, produce irregular eddy flow after the rotation, the speed of rotation of stirring arm is faster, the turbulent situation of irregular eddy flow is just more serious, can cause molten iron to spill or overflow hot metal ladle, thus require initial speed of rotation to be controlled at 20～30r/min according to dross block size size situation, with safety and the direct motion that guarantees clear knurl operation.
About the whirlpool district input sweetening agent of described step (4) to molten iron; And
(5) speed of rotation with stirring rake accelerates to high rotation speed, and described high rotation speed is 85-95r/min.
The mechanical mixing method desulfurization is cross stirring arm to be inserted in the molten iron rotate, and makes molten iron produce whirlpool, then drops into a certain amount of sweetening agent to molten iron whirlpool district, makes the sulphur in sweetening agent and the molten iron in constantly stirring desulphurization reaction occur.The speed of rotation of stirring arm is faster, and molten iron whirlpool district is just larger, and namely the reaction interface of molten iron and sweetening agent is just larger, and the severe degree of chemical reaction is just larger; When level of response surpasses certain value, will produce acutely seething of molten iron in the hot metal ladle, cause molten iron to splash (or splash), causing iron loss increases.Under normal circumstances, the work speed of rotation of stirring arm is controlled at 100～120r/min.
For the stirring arm of dross, because variation has occured its profile, will produce irregular eddy flow in hot metal ladle after the rotation, the speed of rotation of stirring arm is faster, the turbulent situation of irregular eddy flow is just more serious, aggravation molten iron splash (or splash) probability and severe degree.
In addition, the transverse warping moment that irregular dross stirring arm produces when high speed rotating obviously increases, and can cause the disadvantageous effect to stirring arm rotational system equipment and stirring arm jacking system equipment; To cause the electric rotating flow valuve to raise when serious and report to the police and the low warning of steel wire rope tension.
So require the setting of stirring arm speed of rotation when the operation of cleaning buildup must be controlled at 85～95r/min according to dross block size size situation with control, with the safe direct motion that guarantees clear knurl operation and the safe operation of sweetener.
Online hot method for cleaning according to KR method machinery desulfurization stirring rake buildup of the present invention is characterized in that, enters the quality 〉=170t of stove molten iron.
Because require stirring rake descending depth 〉=3990mm, so the corresponding result who calculates requires exactly when carrying out clearly knurl operation, the iron water amount that enters the station must be greater than 170 tons.
Online hot method for cleaning according to KR method of the present invention machinery desulfurization stirring rake buildup is characterized in that, the temperature of molten iron 〉=1320 ℃.
From metallurgical angle, high temperature, high alkalinity, low oxidative are the necessary and sufficient condition that molten iron and molten steel carry out desulfurization, itself just require the molten iron temperature that enters the station more high better; And in large production reality, being subjected to the impact of last process (blast furnace) production status and the impact of Molten Iron Transportation and scheduling link, the molten iron that enters the station of KR desulfurization station reality has very large fluctuation.And because the selection of the control of the operation in KR treating processes parameter is different, it is also different to process temperature drop.Generally, the stove molten iron temperature Schwellenwert that enters that converter requires is 〉=1230 ℃, and the average temperature drop of KR desulfurization is 30 ℃, and the clear knurl temperature loss that draws according to the test at scene is 50 ℃.
Therefore, according to the present invention, for guaranteeing successfully clear knurl and guarantee to finish at clear knurl heat the desulfurization requirement of molten iron that the molten iron temperature that enters the station must be greater than 1320 ℃.The temperature of molten iron satisfied that converter smelting is desired to enter stove molten iron temperature value after thereby the KR that guarantee the clear knurl of stirring arm, desulfurizing iron, is blended into converter processed.
Online hot method for cleaning according to KR method machinery desulfurization stirring rake buildup of the present invention is characterized in that when buildup size R was 200-300mm, the process time of step (6) was 20-35min.
Online hot method for cleaning according to KR method machinery desulfurization stirring rake buildup of the present invention is characterized in that when buildup size R was 300-500mm, the process time of step (6) was 32-45min.
In normal KR desulfurization, (V=60～80r/min) rotation adds sweetening agent to begin low speed after the stirring arm insertion molten iron arrival depthkeeping degree of depth, material adds rear speed-raising, begin timing after rotating speed reaches 100～120r/min, usually said desulfurization time namely refers to begin to desulfurization finish to reduce speed now/the to carry pure churning time of slurry from timing in the industry; And the pure stirring desulphurization time of domestic and international KR desulfurization process is generally all at 8～12min.
For the clear knurl of stirring arm, its principle is exactly to rely on the kinetic energy of the heat energy of high temperature liquid iron and at a slow speed mobile flowing molten iron generation to finish.Obtain according to test, in the scope of above-mentioned clear knurl temperature, the stirring arm of buildup piece 200mm size must have the stirring arm of the 20min time of inserting just can make buildup be decomposed and dissolve; Along with the increase of buildup piece, the molten slurry time is necessary corresponding prolongation also; The stirring arm of buildup piece 500mm size must have the stirring arm of the 40min time of inserting just can make buildup be decomposed and dissolve.
Online hot method for cleaning according to KR method machinery desulfurization stirring rake buildup of the present invention is characterized in that described sweetening agent comprises lime powder 5-9kg/ ton molten steel, fluorite 0.4-0.7kg/ ton molten steel, aluminium slag 0-0.5kg/ ton molten steel.
Technical parameter table and process parameter table see Table 1
Table 1: cleaning stirring rake buildup technical parameter table
The present invention is directed to KR stirring arm buildup and adopt online hot cleaning, under the described molten iron temperature range of condition of technical essential, can realize that hot dry slag to the KR stirring arm/sticking iron/buildup is effectively cleared up online; Effectively reduce replacing number of times, raising stirring rake life-span, minimizing nonproductive activity duration of operation, the raising of stirring arm and produce the line manufacturing capacity, and can significantly reduce the cost of anti-material the and the maintenance cost of stirring arm.
Embodiment
Embodiment 1 lower limit parameter is implemented
Buildup size R ≈ 200 (mm)
Effect: disposable molten clear; The buildup zone is without convex dry slag situation.
Implement two: upper limit parameter is implemented
Buildup size R ≈ 500 (mm)
Effect: disposable molten clear; Slightly there is convex dry slag situation in the buildup zone, does not affect desulfurization and uses.
Implement three: middle limit parameter is implemented
Buildup size R ≈ 300 (mm)
Effect: disposable molten clear; The buildup zone is without convex dry slag situation.
According to above-described embodiment, the KR desulfurization process carries out the carbon steel Deep Desulphurization of Hot Metal, and sweetening effectiveness is good, and average desulfuration rate reaches 93.5%, and average terminal point [S] content remains on 0.00095%; Average month life-spans 330.2 stove of stirring arm/(improve 8.8 stoves /) on average changed 1.83 times/month (reducing 1.34 times/month); Reduce the nonproductive activity duration 53.6min/ month of operation, promote about 0.3 ten thousand ton/years of KR desulfurization pre-treatment ability.
According to the online hot cleaning of KR stirring arm buildup of the present invention, under the described molten iron temperature range of condition of technical essential, can realize that hot dry slag to the KR stirring arm/sticking iron/buildup is effectively cleared up online; Effectively reduce replacing number of times, raising stirring rake life-span, minimizing nonproductive activity duration of operation, the raising of stirring arm and produce the line manufacturing capacity, and can significantly reduce the cost of anti-material the and the maintenance cost of stirring arm.
Claims (6)
1. the online hot method for cleaning of KR method machinery desulfurization stirring rake buildup is characterized in that the concrete steps of described method are as follows:
(1) in hot metal ladle, adds molten iron;
(2) stirring rake with dross inserts molten iron, and described stirring rake inserts the degree of depth 〉=3990mm of molten iron;
(3) with initial speed of rotation Stirring oar, described initial speed of rotation is 20-30r/min;
(4) in molten iron, add sweetening agent;
(5) speed of rotation with stirring rake accelerates to high rotation speed, and described high rotation speed is 85-95r/min;
(6) keep stirring rake with high rotation speed operation 20-45min;
(7) being decelerated to stirring rake stops the rotation;
(8) propose stirring rake, finish cleaning.
2. the online hot method for cleaning of a kind of KR method machinery desulfurization stirring rake buildup as claimed in claim 1 is characterized in that, enters the quality 〉=170t of stove molten iron.
3. the online hot method for cleaning of a kind of KR method machinery desulfurization stirring rake buildup as claimed in claim 1 is characterized in that, the temperature of molten iron 〉=1320 ℃.
4. the online hot method for cleaning of a kind of KR method machinery desulfurization stirring rake buildup as claimed in claim 1 is characterized in that when buildup size R was 200-300mm, the process time of step (6) was 20-35min.
5. the online hot method for cleaning of a kind of KR method machinery desulfurization stirring rake buildup as claimed in claim 1 is characterized in that when buildup size R was 300-500mm, the process time of step (6) was 32-45min.
6. the online hot method for cleaning of a kind of KR method machinery desulfurization stirring rake buildup as claimed in claim 1 is characterized in that described sweetening agent comprises lime powder 5-9kg/ ton molten iron, fluorite 0.4-0.7kg/ ton molten iron, aluminium slag 0-0.5kg/ ton molten iron.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201010156196 CN102234703B (en) | 2010-04-23 | 2010-04-23 | On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method |
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| CN 201010156196 CN102234703B (en) | 2010-04-23 | 2010-04-23 | On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method |
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Families Citing this family (8)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN105018678B (en) * | 2015-08-04 | 2018-03-27 | 承德建龙特殊钢有限公司 | A kind of steel desulfurization agent and its sulfur method and method for making steel |
| CN105734200A (en) * | 2016-03-30 | 2016-07-06 | 中冶南方工程技术有限公司 | Molten iron pretreatment stirring head slag removing method and stirring system |
| CN107449623A (en) * | 2016-05-31 | 2017-12-08 | 上海金艺检测技术有限公司 | Steel mill KR method molten iron desulphurization stirring device health status on-line monitoring methods |
| CN106544471B (en) * | 2016-10-18 | 2018-05-29 | 北京首钢自动化信息技术有限公司 | A kind of control method of KR methods desulfurization smelting process speed of agitator |
| CN109280746B (en) * | 2018-11-30 | 2020-06-05 | 鞍钢集团工程技术有限公司 | Dynamic control method for KR desulfurization stirring |
| CN110055369B (en) * | 2019-05-21 | 2020-11-20 | 武汉钢铁有限公司 | Method for quickly cleaning sticky slag of KR desulfurization stirrer for molten iron |
| CN113817894A (en) * | 2020-06-21 | 2021-12-21 | 宝山钢铁股份有限公司 | Online cleaning method for sticky slag of KR desulfurization stirrer of molten iron |
| CN113652509B (en) * | 2021-07-06 | 2023-02-03 | 首钢京唐钢铁联合有限责任公司 | Method and device for detecting slag deposition of stirring head for steelmaking desulfurization and industrial control equipment |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2923725Y (en) * | 2006-03-07 | 2007-07-18 | 武汉钢铁(集团)公司 | Novel KR desulfurizing agitator |
| CN101403022A (en) * | 2008-08-18 | 2009-04-08 | 武汉钢铁(集团)公司 | Desulfurization agitator head for hot metal |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN2923725Y (en) * | 2006-03-07 | 2007-07-18 | 武汉钢铁(集团)公司 | Novel KR desulfurizing agitator |
| CN101403022A (en) * | 2008-08-18 | 2009-04-08 | 武汉钢铁(集团)公司 | Desulfurization agitator head for hot metal |
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