CN102041347B - Method for synchronizing combined blowing and furnace age of converter - Google Patents
Method for synchronizing combined blowing and furnace age of converter Download PDFInfo
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- CN102041347B CN102041347B CN2010106208151A CN201010620815A CN102041347B CN 102041347 B CN102041347 B CN 102041347B CN 2010106208151 A CN2010106208151 A CN 2010106208151A CN 201010620815 A CN201010620815 A CN 201010620815A CN 102041347 B CN102041347 B CN 102041347B
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Abstract
The invention discloses a method for synchronizing combined blowing and a furnace age of a converter, which belongs to the technical field of convertor steelmaking. A small flow air feed mode is adopted by bottom blowing; and before converter blowing, the ten-minute air feed flow of bottom blowing is 160 to 180Nm<3>/h, the eleven to thirteen-minute air feed flow of bottom blowing is 220 to 240 Nm<3>/h, and the fourteen to fifteen-minute air feed flow of bottom blowing is 340 to 360Nm<3>/h; and a gun core of bottom blowing is prevented from being corroded quickly, and after tapping, final slag is modified. Slag is remained to protect the furnace bottom, the air flow of bottom blowing is increased, an air permeable furnace bottom can be promoted to be quickly formed; and technology for forming the air permeable furnace bottom is that a disperse and air permeable slag and material binding layer is formed at the end of bottom blowing air permeable bricks of the converter for protecting the cores of the bottom blowing air permeable bricks from being corroded and damaged by adjusting splashed slag of the converter, smelting and maintaining the bottom blowing air permeable bricks of the converter. The method has the advantages of guaranteeing the combining blowing effect of the whole smelting process of the converter, and particularly guaranteeing that the converter has good combined blowing and smelting effect in the later period of smelting to ensure that the combined blowing and the furnace age of the converter are synchronized.
Description
Technical field
The present invention belongs to the converter steeling technology field, particularly provides a kind of and has realized that converter is blown with furnace life again and reach synchronous method.
Background technology
In " iron and steel " magazine; Liu Liu writes in long-lived combined blown converter Technology exploitation: the life-span world level of the directed capillary bottom blowing of porous nozzle is about the 2000-3000 stove; Through spattering the slag technical optimization, promote the first-born one-tenth of bottom blowing nozzle-end slag charge metal mushroom, thereby reach long-lived.This technology relatively is fit to the lower steel mill of bottom blowing intensity; Variety steel is smelted and big flow is smelted oxygen supply pattern needs in order to satisfy, and bottom blowing gas intensity is bigger, and bottom blowing in early stage brick core corrodes fast; The metal mushroom head is difficult for generating, and causes bottom blowing brick easy blocking under the situation of dying.And owing to smelt the factor of kind, it is bigger that furnace bottom is dynamically controlled difficulty.
Summary of the invention
The object of the present invention is to provide and a kind ofly realize that converter blows the method synchronous with furnace life again.Can guarantee that omnidistance the answering of converter smelting blow effect, especially guarantee to smelt the later stage converter and have good answering and blow metallurgical effect, converter blown with furnace life again reach synchronous.
Converter lining life＜2000 stoves, low discharge (160-360Nm is adopted in bottom blowing
3/ h, strength range 0.027-0.06Nm
3/ t.min) blowing model, and bessemerize preceding 10 minutes bottom blowing gas flows at 160-180Nm
3/ h, 11-13 minute bottom blowing gas flow are at 220-240Nm
3/ h, 14-15 minute bottom blowing gas flow are at 340-360Nm
3/ h, it is too fast to avoid bottom blowing rifle core to corrode, tapping back finishing slag upgrading.Employing is stayed at the bottom of the slag furnace retaining, manually strengthens bottom blown gas flow (600Nm
3/ h, and 0.1Nm
3/ t.min), promote " ventilation property furnace bottom " to generate fast; The maintenance that ventilation property furnace bottom generation technique promptly spatters slag, smelting operation and converter bottom-blown air brick through the adjustment converter forms disperse, ventilative property slag charge key coat in converter bottom-blown air brick end, is used to protect deteriorating of bottom-blown air brick brick core.
(mainly smelt the kind situation according to reality, finished product C weight %＜0.1 weight % controls light-burned add-on 2-2.5t, and the lime add-on is controlled according to basicity 3.4-3.6 through adjustment converter operation; When other kinds were smelted, light-burned adding 0.5-1t, basicity was by 3.2-3.4 control) to control the converter furnace bottom well dynamic, under the prerequisite of assurance converter top-bottom blowing metallurgical effect, makes reach synchronous with furnace life the work-ing life of converter bottom blowing brick.Cooperate converter to increase the blowing oxygen supply intensity, effectively shortened the converter smelting oxygen supply time 90 seconds.Explain converter blow again have good stirring capacity with blow effect again, verified that from the result converter bottom blowing effect is better.
In smelting process; Through setting converter lining life of two days thickness measurings; Periodic observation converter furnace bottom thickness is dynamic, follows the tracks of each steel grade and smelts the finishing slag characteristics, through testing corresponding converter finishing slag basicity (3.2-3.6), finishing slag MgO content (8 weight %-10 weight %), the finishing slag amount (70 weight %-80 weight %) confirmed; Spatter slag rifle position (8.0-8.5m) and spatter the slag time (2-4 minute), it is thick in 50～150mm effectively to control converter furnace bottom slag;
In order to guarantee in time to grasp converter furnace bottom change dynamics, require (conditions permit can guarantee survey in a day, and the smelting low carbon kind is on duty must be measured) at the bottom of two days thickness measuring once furnace, based on thickness measuring furnace bottom result, in time adjust converter and spatter the slag relevant parameter;
Grope through test, confirm that the furnace bottom slag is thick in 50-100mm, control finishing slag basicity 3.4-3.6, MgO content 9%-10%, quantity of slag weight 80% is spattered slag rifle position control 8.3-8.5m, spatters 3-4 minute slag time;
Furnace bottom thickness is controlled finishing slag basicity 3.2-3.4 at 100-150mm, MgO content 8 weight %-9 weight %, and the quantity of slag 70 weight % spatter slag rifle position and are controlled at 8-8.3m, spatter 2-3 minute slag time.
Blow the result of use aspect again:
1) multiple blown converter age can be synchronous with furnace life, blows again than 100%;
2) adopt that fast changeable bottom tuyere, each branch road are independently controlled, controlled range (0.03～0.10Nm
3/ min.t) the gas bottom blowing and supplying system of big flow adjustment.
3) smelting molten steel [C] was at 0.04%～0.05% o'clock, and each furnace life, interval finishing slag TFe content can remain between the 18.7%-20.51%;
4) the converter smelting middle and later periods, [C] [O] is long-pending in the steel on average reaches 0.00289, and overall average is 0.00277, explains that converter has better to blow metallurgical effect again;
5) the long-lived bottom blowing of converter cooperates to increase the converter oxygen supply intensity (from 3.3Nm
3/ min.t brings up to 3.67Nm
3/ min.t), effectively shortened the converter smelting oxygen supply time 90 seconds;
6) the combined blown converter phosphor partition ratio more approaches theoretical value, and the dephosphorization effect of slag obviously is better than top blown converter;
7) after employing was blown again, the residual manganese of combined blown converter terminal point improved 0.010% than top blown converter;
8) smelting contains aluminum steel, and the consumption of final deoxygenation aluminum shot can be practiced thrift the 5kg/ stove; Smelt the straight carbon steel kind, final deoxygenation SiAlBa consumes can practice thrift the 11kg/ stove; The specific absorption of Si, Mn improves 6.21%, 1.8% respectively, and the specific absorption of converter smelting middle and later periods Si, Mn is average out to 94.01%, 86.76% respectively;
Embodiment
Embodiment 1: the low discharge pattern is adopted in the converter bottom blowing: bessemerize preceding 10 minutes bottom blowing gas flow 180Nm
3/ h, 11 minutes bottom blowing gas flow 240Nm
3/ h, 14 minutes bottom blowing gas flow 360Nm
3/ h after this pattern adopts, finds that through thickness measuring converter furnace bottom bottom blowing rifle position presents up-trend, below is the thickness measuring result, and 789 furnace bottoms blow position thickness 580mm, 1200 stove thickness 620mm, 1780 stove thickness 650mm.
Embodiment 2: according to smelting kind situation adjustment converter operation, smelt kind finished product C%＜0.1%, control light-burned add-on greater than 2t, control according to basicity 3.5 from grey add-on; When other kinds were smelted, light-burned adding was less than 1 ton, and basicity is pressed 3.2-3.4 control, under this operator scheme, improves and bessemerizes the process oxygen supply intensity (from 3.3Nm
3/ min.t brings up to 3.67Nm
3/ min.t), make the actual oxygen supply time of converter drop to 15 minutes from 16.5 minutes, shorten actual oxygen supply time 90S.The furnace bottom of converter simultaneously control thickness is at 50-150mm.
Embodiment 3: converter furnace bottom thickness measuring 510mm, and the thick 500mm of bottom brick, thickness of slag layer 10mm, slag parameter control finishing slag basicity 3.6 is spattered in adjustment; MgO% content 10%, the quantity of slag 80% is spattered slag rifle position control 8.5m; Spatter 4 minutes slag time, spattered slag in continuous two days after, thickness measurement with laser converter furnace bottom thickness is 560mm; Thickness of slag layer 60mm, after 6 days, the furnace bottom thickness of slag layer is brought up to 100mm;
Embodiment 4: converter furnace bottom thickness measuring 640mm, and the furnace bottom thickness of slag layer is 140mm, slag parameter control finishing slag basicity 3.2 is spattered in adjustment; MgO% content 8%, the quantity of slag 70% is spattered slag rifle position control 8.1m; Spatter 2 minutes slag time, after continuous 4 days, the furnace bottom thickness of slag layer controls to 100mm.
According to the thickness measurement with laser result, in time adjust the splashing slag in converter correlation parameter, converter furnace bottom thickness of slag layer is controlled to zone of reasonableness.
This method can guarantee the converter smelting later stage, blow again to have the excellent metallurgical effect, and the comprehensive cost that consumes is lower.
Claims (4)
1. realize that converter is blown with furnace life again and reach synchronous method for one kind, it is characterized in that,
Converter lining life＜2000 stoves, 160-360Nm is adopted in bottom blowing
3/ h, strength range 0.027-0.06Nm
3/ t.min blowing model, and bessemerize preceding 10 minutes bottom blowing gas flows at 160-180Nm
3/ h, 11-13 minute bottom blowing gas flow are at 220-240Nm
3/ h, 14-15 minute bottom blowing gas flow are at 340-360Nm
3/ h, it is too fast to avoid bottom blowing rifle core to corrode, tapping back finishing slag upgrading; Employing is stayed at the bottom of the slag furnace retaining, strengthens the bottom blown gas flow to 600Nm
3/ h, and 0.1Nm
3/ t.min promotes " ventilation property furnace bottom " to generate;
According to smelting the kind situation, finished product C weight %＜0.1 weight % controls light-burned add-on 2-2.5t, and the lime add-on is controlled according to basicity 3.4-3.6; When other kinds are smelted, light-burned adding 0.5-1t, basicity is pressed 3.2-3.4 control, under the prerequisite that guarantees converter top-bottom blowing metallurgical effect, makes reach synchronous with furnace life the work-ing life of converter bottom blowing brick;
In smelting process; Measure a converter lining life through setting 1-2 days; Observation converter furnace bottom thickness is dynamic, follows the tracks of each steel grade and smelts the finishing slag characteristics, confirms corresponding converter finishing slag basicity 3.2-3.6, finishing slag MgO content 8%-10%, finishing slag amount 70 weight %-80 weight % through testing; Spatter slag rifle position 8.0-8.5m and spatter 2-4 minute slag time, it is thick in 50～150mm effectively to control converter furnace bottom slag.
2. realization converter according to claim 1 is blown again with furnace life and is reached synchronous method; It is characterized in that, confirm that the furnace bottom slag is thick in 50-100mm, control finishing slag basicity 3.4-3.6; MgO content 9 weight %-10 weight %; The quantity of slag 80 weight % spatter slag rifle position control 8.3-8.5m, spatter 3-4 minute slag time.
3. realization converter according to claim 1 is blown again with furnace life and is reached synchronous method, it is characterized in that, furnace bottom thickness is at 100-150mm; Control finishing slag basicity 3.2-3.4, MgO content 8 weight %-9 weight %, the quantity of slag 70 weight %; Spatter slag rifle position and be controlled at 8-8.3m, spatter 2-3 minute slag time.
4. realization converter according to claim 1 is blown again with furnace life and is reached synchronous method; It is characterized in that; It is the maintenance of spattering slag, smelting operation and converter bottom-blown air brick through the adjustment converter that the ventilation property furnace bottom generates; Form disperse, ventilative property slag charge key coat in converter bottom-blown air brick end, be used to protect deteriorating of bottom-blown air brick brick core.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208151A CN102041347B (en) | 2010-12-23 | 2010-12-23 | Method for synchronizing combined blowing and furnace age of converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010106208151A CN102041347B (en) | 2010-12-23 | 2010-12-23 | Method for synchronizing combined blowing and furnace age of converter |
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| Publication Number | Publication Date |
|---|---|
| CN102041347A CN102041347A (en) | 2011-05-04 |
| CN102041347B true CN102041347B (en) | 2012-08-01 |
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| CN2010106208151A Active CN102041347B (en) | 2010-12-23 | 2010-12-23 | Method for synchronizing combined blowing and furnace age of converter |
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Families Citing this family (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105463152B (en) * | 2015-12-07 | 2017-10-03 | 北京首钢股份有限公司 | A kind of converter slag splashing method |
| TWI630276B (en) * | 2016-09-02 | 2018-07-21 | 中國鋼鐵股份有限公司 | Method for controlling status of accretion formation in pyrometallurgical treatment |
| CN110157848A (en) * | 2019-05-06 | 2019-08-23 | 山东钢铁集团有限公司 | A kind of bottom blowing flow dynamics control method of top and bottom combined blown converter |
| CN111440917A (en) * | 2020-04-21 | 2020-07-24 | 攀钢集团攀枝花钢铁研究院有限公司 | Method for controlling uniform erosion of steel furnace bottom blowing bricks and furnace bottom |
| CN113234884A (en) * | 2021-04-23 | 2021-08-10 | 甘肃酒钢集团宏兴钢铁股份有限公司 | Method for solving interference between positions of top-blown gas and bottom-blown lance of converter |
Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487071A (en) * | 2009-02-23 | 2009-07-22 | 钢铁研究总院 | Method for regenerating metal furnace cinder composite mushroom and shimming permeable furnace bottom |
| CN101487070A (en) * | 2009-02-23 | 2009-07-22 | 钢铁研究总院 | Method for improving combined blown converter campaign length by metal furnace cinder composite mushroom |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPS59153818A (en) * | 1983-02-21 | 1984-09-01 | Nippon Steel Corp | Refining process in top and bottom-blown converter |
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2010
- 2010-12-23 CN CN2010106208151A patent/CN102041347B/en active Active
Patent Citations (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101487071A (en) * | 2009-02-23 | 2009-07-22 | 钢铁研究总院 | Method for regenerating metal furnace cinder composite mushroom and shimming permeable furnace bottom |
| CN101487070A (en) * | 2009-02-23 | 2009-07-22 | 钢铁研究总院 | Method for improving combined blown converter campaign length by metal furnace cinder composite mushroom |
Non-Patent Citations (1)
| Title |
|---|
| JP昭59-153818A 1984.09.01 |
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Address after: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee after: Shougang Group Co. Ltd. Patentee after: Qinhuangdao Shouqin Metal Material Co., Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Capital Iron & Steel General Company Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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Effective date of registration: 20190408 Address after: 100041 Shijingshan Road, Shijingshan District, Shijingshan District, Beijing Patentee after: Shougang Group Co. Ltd. Address before: 066326 Du Zhuang Township, Funing County, Qinhuangdao, Hebei Co-patentee before: Shougang Group Co. Ltd. Patentee before: Qinhuangdao Shouqin Metal Material Co., Ltd. |
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