CN112280927A - Operation method for baking scrap steel in converter - Google Patents
Operation method for baking scrap steel in converter Download PDFInfo
- Publication number
- CN112280927A CN112280927A CN202011198171.1A CN202011198171A CN112280927A CN 112280927 A CN112280927 A CN 112280927A CN 202011198171 A CN202011198171 A CN 202011198171A CN 112280927 A CN112280927 A CN 112280927A
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- China
- Prior art keywords
- converter
- baking
- steel
- oxygen
- lance
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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
-
- 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
- C21C5/56—Manufacture of steel by other methods
- C21C5/562—Manufacture of steel by other methods starting from scrap
- C21C5/565—Preheating of scrap
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses an operation method for baking scrap steel in a converter, which comprises the following processing steps: preparing a converter, waste steel and a coal-oxygen lance, moving the coal-oxygen lance to a working position in step 1, igniting at a long open fire position of an oxygen lance opening, then descending to a waiting position, adding the waste steel in a trough 2 into the converter, shaking the converter back and forth for 3-5 times to uniformly distribute the waste steel, then shaking the converter right, adjusting the opening degrees of coal gas and oxygen to specified parameters, and judging that the flame is normal. The method uses the steel scrap in a special steel workshop of the converter, uses a special coal-oxygen lance, can achieve the aims of short baking time, more lifting of the steel scrap ratio, reduction of damage to a furnace lining, improvement of baking efficiency, reduction of consumption and the like, and specifies the opening change parameters of a process regulating valve, the process lance position change and the like, and by the baking method, the steel scrap ratio can be improved to more than 30 percent, the steel scrap baking time is controlled within 10min, so that high-efficiency baking is realized, and the production rhythm of the working procedures is basically not influenced.
Description
Technical Field
The invention relates to the technical field of steel smelting, in particular to an operation method for baking scrap steel in a converter.
Background
Converter, pronunciation, chinese word mean one kind of steelmaking stove. Generally refers to a cylindrical oxygen-blown steel-making vessel which can tilt. The furnace body is cylindrical and is arranged on a horizontal shaft bracket in a rotatable manner. The steel is also used for steelmaking, and the waste steel is discarded or damaged in production and life engineering and is used as recycled waste steel; the carbon content is generally less than 2.0%, and the contents of sulfur and phosphorus are not more than 0.05%. The scrap steel has various shapes due to different conditions, the performance of the scrap steel is basically the same as that of a finished product of the scrap steel, but the scrap steel is influenced by factors such as aging effectiveness, fatigue property and the like, the performance is reduced, and China is the first world-wide steel production (the yield of Chinese crude steel is 7.2 hundred million tons and accounts for 48 percent of the global total yield; the yield of Chinese pig iron in 2012 is 6.7 hundred million tons and accounts for 60.91 percent of the global total yield). And is also the largest scrap steel demand market in the world. The steel yield and the use amount of scrap iron and steel in China are always increased year by year from 1996. The demand of scrap in China is expected to increase greatly in the future, and the total amount of scrap produced in a country is determined by the steel production (steel product production) and the accumulated amount of scrap. The accumulated amount of scrap is caused by the accumulation of the consumption of steel and iron and steel products over the years. The generation of the waste steel in the society every year is directly influenced by the scrap cycle of steel equipment and steel facilities and the high and low comprehensive utilization rate of steel processing. In the era of continuous reduction of iron ore resources and continuous increase of waste steel and iron resources, waste steel and iron have become main raw materials of important strategic resources and economic development of the country, and in the actual production, the limitation of physical heat and chemical heat of molten iron entering a furnace is suffered, the usage ratio of the waste steel is about 15 percent, the reaction in the furnace is basically in a heat balance state, and the utilization rate of the waste steel cannot be continuously improved.
At present, the top-bottom combined blown converter baking furnaces of various large steel plants adopt coke baking furnace linings, the coke is added into the furnaces at one time, oxygen blowing combustion supporting is carried out through oxygen lances for steelmaking to bake the furnace linings, the method is easy to cause furnace bottom burning loss when the lance position is low and the oxygen pressure is high, coke is not fully combusted when the lance position is high and the oxygen pressure is low, the furnace bottom baking effect is poor, the phenomena that a hearth and a furnace cap are sintered and the temperature of the furnace bottom is still low frequently occur. After a new furnace is started, because the baking effect of the furnace bottom is poor, the phenomena of steel infiltration of the furnace shell and furnace leakage accidents are easy to occur, and the service life and the safe production of the converter lining are influenced.
In the furnace baking method of a top-bottom combined blown converter with the prior application technical number of CN201510289759.0, coke is respectively put into a scrap steel hopper and a converter high-level bin; when a new furnace is started and dried, coke in a waste steel hopper is ignited in advance, the furnace is baked by medium fire, a proper amount of coke is added into the converter from a high-level storage bin of the converter every 4-5 minutes in the process, and the baking time is controlled to be 50-60 min; and then baking with big fire, adding a proper amount of coke every 2 minutes in the process, lifting a gun and closing oxygen when flame at a furnace mouth turns white after the coke in a high-position storage bin is completely added, and finishing baking the furnace, wherein the coke in the converter baking technology is fully combusted, the baking effect at the furnace bottom is good, and the operation method for baking the steel scraps in the converter effectively avoids the phenomena of furnace shell steel infiltration and furnace leakage accidents.
Disclosure of Invention
The invention provides an operation method for baking steel scraps in a converter, which is used for solving the technical problems that the prior art provides large water difference of steel scraps, insufficient molten iron supply of a staged blast furnace and insufficient integral heat caused by the increase of a steel scrap ratio, the prior art uses a coal-oxygen lance to bake and preheat in the converter, uses coke oven gas to bake and bake for a long time, has slow steel scrap ratio increase and is easy to damage a furnace lining, and the baking efficiency of the converter to the steel scraps is reduced and the consumption of energy is increased.
In order to solve the technical problems, the technical scheme adopted by the invention is as follows: an operation method for baking scrap steel in a converter furnace comprises the following processing steps,
preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position, igniting at a long open fire position of an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter right, and adjusting the opening degrees of coal gas and oxygen to specified parameters;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after the baking time is reached, closing oxygen after the baking is finished, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
Preferably, the working position of the coal-oxygen lance in the step (1) is 3m-3.6 m.
Preferably, the flow rate of the coal gas in the step (2) is 700-900 Nm3/h, and the flow rate of the oxygen is 600-800 Nm 3/h.
Preferably, the baking time in step (4) is 6 to 10 minutes.
Preferably, the oxygen supply flow of the oxygen lance in the step (4) is 1-3 minutes of oxygen opening and 3000m3/h, 4-5 minutes of 5000m3/h and 6-10 minutes of 7000m 3/h.
Preferably, the iron adding and smelting in the step (6) comprises adding molten iron, blowing and pouring steel.
Compared with the prior art, the invention has the beneficial effects that: the method comprises the steps of using the steel scrap in a special steel workshop of a converter, adding the steel scrap in a 2-trough into the converter by using a special coal-oxygen lance, shaking the converter back and forth for 3-5 times to uniformly distribute the steel scrap, then shaking the converter, adjusting the opening degrees of coal gas and oxygen to specified parameters, judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting the steel scrap, and quickly lowering the oxygen lance to a certain value (relative height) after specified time; the method comprises the steps of roasting for 10 minutes, taking a gun, closing oxygen after roasting, closing coal gas, finally opening nitrogen, blowing for 2 minutes, closing a nitrogen valve, normally adding iron for smelting after the roasting of the waste steel is finished, normally splashing slag after the smelting is finished, moving a coal-oxygen gun to a working position after the splashing slag is finished, repeatedly igniting, waiting for taking the gun down, adding the waste steel for roasting, taking the gun up for closing, moving the gun, and the like, can achieve the purposes of shortening the roasting time, increasing the waste steel ratio, reducing the damage of a furnace lining, improving the roasting efficiency, reducing the consumption and the like, and defines the opening change parameters of a process regulating valve, the change of the process gun position and the like.
Detailed Description
In order to make the technical means, inventive features, objectives and effects realized by the present invention easy to understand and understand, the present invention is further described below with reference to the specific embodiments.
Example 1
Preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position of 3m, igniting at a position of an open flame at an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter, adjusting the opening degree of coal gas to 600Nm3/h, and adjusting the opening degree of oxygen to 500Nm 3/h;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after baking for 6 minutes, closing oxygen after baking is finished, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
Preferably, the working position of the coal-oxygen lance in the step (1) is 3m-3.6 m.
Preferably, the flow rate of the coal gas in the step (2) is 700-900 Nm3/h, and the flow rate of the oxygen is 600-800 Nm 3/h.
Preferably, the baking time in step (4) is 6 to 10 minutes.
Preferably, the oxygen supply flow of the oxygen lance in the step (4) is 1-3 minutes of oxygen opening and 3000m3/h, 4-5 minutes of 5000m3/h and 6-10 minutes of 7000m 3/h.
Preferably, the iron adding and smelting in the step (6) comprises adding molten iron, blowing and pouring steel
In the case of the example 2, the following examples are given,
preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position of 3.2m, igniting at a long open fire position of an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter, adjusting the opening degree of the coal gas to 700Nm3/h, and adjusting the opening degree of the oxygen to 600Nm 3/h;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after baking for 7.5 minutes, closing oxygen after baking, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
Preferably, the working position of the coal-oxygen lance in the step (1) is 3m-3.6 m.
Preferably, the flow rate of the coal gas in the step (2) is 700-900 Nm3/h, and the flow rate of the oxygen is 600-800 Nm 3/h.
Preferably, the baking time in step (4) is 6 to 10 minutes.
Preferably, the oxygen supply flow of the oxygen lance in the step (4) is 1-3 minutes of oxygen opening and 3000m3/h, 4-5 minutes of 5000m3/h and 6-10 minutes of 7000m 3/h.
Preferably, the iron adding and smelting in the step (6) comprises adding molten iron, blowing and pouring steel.
In the case of the example 3, the following examples are given,
preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position of 3.4m, igniting at a long open fire position of an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter, adjusting the gas opening to 800Nm3/h, and adjusting the oxygen opening to 700Nm 3/h;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after baking for 9 minutes, closing oxygen after baking is finished, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
Preferably, the working position of the coal-oxygen lance in the step (1) is 3m-3.6 m.
Preferably, the flow rate of the coal gas in the step (2) is 700-900 Nm3/h, and the flow rate of the oxygen is 600-800 Nm 3/h.
Preferably, the baking time in step (4) is 6 to 10 minutes.
Preferably, the oxygen supply flow of the oxygen lance in the step (4) is 1-3 minutes of oxygen opening and 3000m3/h, 4-5 minutes of 5000m3/h and 6-10 minutes of 7000m 3/h.
Preferably, the iron adding and smelting in the step (6) comprises adding molten iron, blowing and pouring steel.
In the case of the example 4, the following examples are given,
preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position of 3.6m, igniting at a long open fire position of an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter, adjusting the opening degree of coal gas to 900Nm3/h, and adjusting the opening degree of oxygen to 800Nm 3/h;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after baking for 10 minutes, closing oxygen after baking is finished, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
Preferably, the working position of the coal-oxygen lance in the step (1) is 3m-3.6 m.
Preferably, the flow rate of the coal gas in the step (2) is 700-900 Nm3/h, and the flow rate of the oxygen is 600-800 Nm 3/h.
Preferably, the baking time in step (4) is 6 to 10 minutes.
Preferably, the oxygen supply flow of the oxygen lance in the step (4) is 1-3 minutes of oxygen opening and 3000m3/h, 4-5 minutes of 5000m3/h and 6-10 minutes of 7000m 3/h.
Preferably, the iron adding and smelting in the step (6) comprises adding molten iron, blowing and pouring steel.
The above examples only show certain embodiments of the present invention, and the description thereof is more specific and detailed, but not construed as limiting the scope of the present invention. It should be noted that, for a person skilled in the art, several variations and modifications can be made without departing from the inventive concept, which falls within the scope of the present invention. Therefore, the protection scope of the present patent shall be subject to the appended claims.
Claims (6)
1. An operating method for baking scrap in a converter furnace is characterized by comprising the following processing steps,
preparation work: preparing a converter, scrap steel and a coal-oxygen lance;
moving the coal-oxygen lance to a working position, igniting at a long open fire position of an oxygen lance port, and then descending to a waiting position;
step (2), adding the scrap steel of the material tank 2 into a converter, shaking the converter back and forth for 3-5 times to uniformly distribute the scrap steel, then shaking the converter right, and adjusting the opening degrees of coal gas and oxygen to specified parameters;
step (3) judging that the flame is normal, lowering the lance position to a certain value, performing lance pressing operation according to the sound of impacting scrap steel, and quickly lowering the oxygen lance to a certain value (relative height) after a specified time;
step (4), lifting the gun after the baking time is reached, closing oxygen after the baking is finished, and then closing coal gas;
step (5), finally opening nitrogen, and closing a nitrogen valve after purging for 2 minutes;
step (6), normally adding iron for smelting after the baking of the scrap steel is finished, and normally splashing slag after the smelting is finished;
and (7) after slag splashing is finished, moving the coal-oxygen lance to a working position, repeatedly igniting, waiting for discharging, adding scrap steel for baking, lifting the lance, shutting down the fire and moving the lance.
2. The method according to claim 1, wherein the operation level of the coal-oxygen lance in step (1) is 3m to 3.6 m.
3. The operating method for baking scrap steel in a converter furnace according to claim 1, wherein the flow rate of the coal gas in the step (2) is 600 to 900Nm3/h, and the flow rate of the oxygen gas is 500 to 800Nm 3/h.
4. The operating method for roasting scrap in a converter according to claim 1, wherein the roasting time in step (4) is 6 to 10 minutes.
5. The method as claimed in claim 1, wherein the oxygen lance in step (4) is supplied with oxygen at a flow rate of 3000m3/h for 1-3 minutes, 5000m3/h for 4-5 minutes, and 7000m3/h for 6-10 minutes.
6. The operating method for roasting scrap in a converter according to claim 1 wherein said iron adding and smelting in step (6) comprises adding molten iron, blowing, and pouring.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202011198171.1A CN112280927A (en) | 2020-10-30 | 2020-10-30 | Operation method for baking scrap steel in converter |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202011198171.1A CN112280927A (en) | 2020-10-30 | 2020-10-30 | Operation method for baking scrap steel in converter |
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| CN112280927A true CN112280927A (en) | 2021-01-29 |
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| CN202011198171.1A Pending CN112280927A (en) | 2020-10-30 | 2020-10-30 | Operation method for baking scrap steel in converter |
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Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
| CN115113604A (en) * | 2022-06-09 | 2022-09-27 | 无人智境(北京)技术有限公司 | Simulation control method and device for converter steelmaking process flow |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN210568404U (en) * | 2019-07-24 | 2020-05-19 | 洛阳豫新工程技术股份有限公司 | Bundling baking oxygen combustion gun for quick and efficient preheating of scrap steel |
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
-
2020
- 2020-10-30 CN CN202011198171.1A patent/CN112280927A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN109593905A (en) * | 2018-12-04 | 2019-04-09 | 天津钢铁集团有限公司 | Steel scrap baking method in a kind of Converter |
| CN210568404U (en) * | 2019-07-24 | 2020-05-19 | 洛阳豫新工程技术股份有限公司 | Bundling baking oxygen combustion gun for quick and efficient preheating of scrap steel |
| CN110628980A (en) * | 2019-08-27 | 2019-12-31 | 江苏省沙钢钢铁研究院有限公司 | Smelting method for improving scrap steel ratio by preheating scrap steel in iron ladle through oxygen combustion gun |
| CN111254250A (en) * | 2020-01-21 | 2020-06-09 | 鞍钢股份有限公司 | Smelting method for improving converter scrap steel ratio |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN113604727A (en) * | 2021-08-11 | 2021-11-05 | 宝武集团鄂城钢铁有限公司 | Smelting method for improving yield of scrap steel metal based on BOF-CC process |
| CN115113604A (en) * | 2022-06-09 | 2022-09-27 | 无人智境(北京)技术有限公司 | Simulation control method and device for converter steelmaking process flow |
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