CN111647707B - Smelting method for improving oxygen supply strength of converter in sectional mode - Google Patents
Smelting method for improving oxygen supply strength of converter in sectional mode Download PDFInfo
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- CN111647707B CN111647707B CN202010558406.7A CN202010558406A CN111647707B CN 111647707 B CN111647707 B CN 111647707B CN 202010558406 A CN202010558406 A CN 202010558406A CN 111647707 B CN111647707 B CN 111647707B
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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
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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
- C21C7/00—Treating molten ferrous alloys, e.g. steel, not covered by groups C21C1/00 - C21C5/00
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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacturing & Machinery (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a smelting method for improving the oxygen supply strength of a converter in a sectional manner, which comprises the following steps: calculating smelting oxygen blowing amount according to the molten iron, the scrap steel components and the loading amount of the converter; the converter starts to ignite and carry out gun-discharging smelting, the oxygen lance position of the oxygen lance is adjusted in a sectional mode by calculating the oxygen blowing percentage, and the oxygen supply flow is adjusted in a sectional mode according to the oxygen blowing percentage; adding auxiliary raw materials for converter smelting in a segmented manner according to the oxygen blowing percentage; when the blowing is carried out until the oxygen supply amount is 100 percent, the gun is lifted to finish the smelting. The invention ensures the stable control of the end point components, shortens the smelting period of the converter, does not need to modify the design of an oxygen lance and a dust removal system, shortens the oxygen supply time of the converter after improving the oxygen supply strength, meets the requirements of oxygen supply, slagging, dephosphorization and decarburization of the converter, has no smoke overflow phenomenon, and is convenient to produce and regulate.
Description
Technical Field
The invention relates to a converter smelting oxygen supply method, in particular to a smelting method for improving converter oxygen supply strength in a sectional manner.
Background
The converter smelting oxygen supply method has influence on end point component control and smelting, the existing oxygen supply method is fixed in oxygen supply flow and constant in oxygen pressure, the same total oxygen consumption and oxygen supply time are long, the smelting period is long, and end point component control is unstable.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide a smelting method for improving the oxygen supply strength of a converter in a sectional manner, and solves the problems of long smelting period and unstable terminal component control of the existing oxygen supply method.
The technical scheme is as follows: the invention comprises the following steps:
(1) calculating smelting oxygen blowing amount according to the total loading amount of the molten iron and the scrap steel of the converter;
(2) the converter starts to ignite and carry out gun-discharging smelting, the oxygen lance position of the oxygen lance is adjusted in a sectional mode by calculating the oxygen blowing percentage, and the oxygen supply flow is adjusted in a sectional mode according to the oxygen blowing percentage;
(3) adding auxiliary raw materials for converter smelting in a segmented manner according to the oxygen blowing percentage;
(4) when the blowing is carried out until the oxygen supply amount is 100 percent, the gun is lifted to finish the smelting.
Wherein the total charging amount of the molten iron and the scrap steel in the furnace in the step (1) is multiplied by 45Nm3The smelting oxygen blowing amount is obtained per ton.
The step (2) of adjusting the lance position of the oxygen lance by oxygen blowing percentage in a segmented manner comprises the following specific steps: when the oxygen blowing percentage is 10%, keeping an ignition slagging gun position of 2000mm, blowing argon percentage by 10% -30%, reducing the gun position to 1500-1600mm, heating to melt slag, judging the slagging condition according to a nitrogen sealing Mars of a flame machine at a furnace mouth after the argon percentage is 30%, lifting the gun position to 1750mm from 1600mm, and lifting the gun to 2000mm to melt slag if the oxygen blowing percentage is 65%; if no drying back occurs, the lance position is maintained at 1750mm, and after the oxygen blowing percentage is 85%, the lance is gradually pressed to 1300mm for decarburization.
The step (2) of adjusting the oxygen supply flow in a sectional mode according to the oxygen blowing percentage specifically comprises the following steps: when the percentage of oxygen blown is 10%, the flow rate of oxygen supplied is maintained at 24000Nm3H, when the oxygen blowing percentage is 10-30%, the oxygen supply flow is increased to 24000-26000Nm3The oxygen supply flow is 24000-25000Nm when the oxygen blowing percentage is 30-65 percent3The oxygen supply flow is 24000-25000Nm when the oxygen blowing percentage is 65-85 percent3After the oxygen blowing percentage is 85 percent, the oxygen supply flow is 25000-3/h。
Adding all lime, 2000-plus 2500kg dolomite, 0-600kg magnesium balls and 1000-plus 1800kg limestone before blowing oxygen by 30% in the step (3), adding the rest dolomite and limestone in batches according to a secondary static model of the converter before blowing oxygen by 85%, adding 300-plus 1000kg magnetic separation powder before blowing oxygen by 70%, and correspondingly adjusting according to the measuring temperature of the sublance and the result of crystallization carbon determination after blowing oxygen by 85%, thereby ensuring the end point temperature and the hit of molten steel components.
Has the advantages that: the invention optimizes the oxygen supply intensity in different smelting stages, uses sectional type to adjust the oxygen supply intensity and uses variable pressure variable gun operation, thereby ensuring stable control of terminal point components and shortening the smelting period of the converter. The oxygen lance design and the dust removal system do not need to be modified, the oxygen supply time of the converter is shortened after the oxygen supply intensity is improved, the requirements of oxygen supply, slagging, dephosphorization and decarburization of the converter are met, the phenomenon of dust overflow is avoided, and the production regulation and control are convenient.
Detailed Description
The invention is further illustrated by the following examples.
Example 1
The invention discloses a smelting method for improving the oxygen supply strength of a converter in a sectional mode, which comprises the following steps:
(1) the molten iron charged into the converter contains 4.53 percent of carbon, 0.41 percent of silicon, 0.131 percent of phosphorus, 102 tons of weight and 24.8 tons of scrap steel, and the calculated smelting oxygen blowing amount is 5706Nm3；
(2) The converter starts to ignite and carry out gun-discharging smelting, and the gun position of the oxygen gun is adjusted in sections by calculating the oxygen blowing percentage;
the overall gun position trend is high → low → high → low mode. The overall gun position trend is high → low → high → low mode. Adjusting according to the argon blowing percentage, and gradually pressing the gun to 1300mm for decarburization.
TABLE 1 gun position statistics table
| Oxygen blowing percentage% | Blow-10% of | 10％-30％ | 30％-65％ | 65％-85％ | 85% -end |
| Position mm of gun | 2000 | 1500-1600 | 1500-1600 | 1600-2000 | 1600-1300 |
(3) Adjusting the oxygen lance position and adjusting the oxygen supply flow in a sectional mode according to the oxygen blowing percentage;
according to the oxygen blowing percentage, the basic oxygen supply flow is increased from 22000Nm3/h to 24000-26000Nm3/h, so that the problems that smoke cannot be removed by dust removal and smoke does not overflow in the whole process due to too violent carbon-oxygen reaction are avoided.
TABLE 2 statistical table of oxygen supply flow of converter
| Oxygen blowing percentage% | Blow-10% of | 10％-30％ | 30％-65％ | 65％-85％ | 85% -end |
| Flow rate Nm3/h | 24000 | 26000 | 25000 | 24000 | 26000 |
(4) Adding auxiliary raw materials for converter smelting in a sectional manner according to the oxygen blowing percentage;
adding different auxiliary raw materials by stages according to the oxygen blowing percentage, the blowing temperature and the slagging condition.
TABLE 3 addition timing and amount of auxiliary materials for the converter
(5) When the blowing reaches the end point of 100 percent, the lance is lifted to finish the smelting, and the actual oxygen supply amount is 5756Nm3. The end point measurement temperature is 1656 ℃, the carbon content is 0.0735% and the phosphorus content is 0.0218%, so that the decarburization and dephosphorization requirements of the process are met, and the phenomena of splashing and smoke overflow are avoided. The actual total smelting time is 14:48, which is 0:54 shorter than the time 15:42 required by the original oxygen supply strength of 22000Nm 3/h.
Example 2
The operation method for smelting the converter by the sectional type improving the oxygen supply intensity of the converter comprises the following steps:
(1) the molten iron charged into the converter contains 4.57 percent of carbon, 0.41 percent of silicon, 0.134 percent of phosphorus, 103 tons of weight and 25.53 tons of scrap steel weight, and the oxygen blowing amount in smelting is calculated to be 5784Nm3；
(2) The converter starts to ignite and carry out gun-discharging smelting, and the gun position of the oxygen gun is adjusted in sections by calculating the oxygen blowing percentage;
the overall gun position trend is high → low → high → low mode. Adjusting according to the argon blowing percentage, and gradually pressing the gun to 1300mm for decarburization.
TABLE 1 gun position statistics table
| Oxygen blowing percentage% | Blow-10% of | 10％-30％ | 30％-65％ | 65％-85％ | 85% -end |
| Position mm of gun | 2000 | 1550 | 1550-1750 | 1750-2000 | 1700-1300 |
(3) Adjusting the oxygen lance position and adjusting the oxygen supply flow in a sectional mode according to the oxygen blowing percentage;
according to the oxygen blowing percentage, the basic oxygen supply flow is increased from 22000Nm3/h to 24000-26000Nm3/h, so that the problems that smoke cannot be removed by dust removal and smoke does not overflow in the whole process due to too violent carbon-oxygen reaction are avoided.
TABLE 2 statistical table of oxygen supply flow of converter
| Oxygen blowing percentage% | Blow-10% of | 10％-30％ | 30％-65％ | 65％-85％ | 85% -end |
| Flow rate Nm3/h | 24000 | 26000 | 25000 | 24000 | 26000 |
(4) Adding auxiliary raw materials for converter smelting in a sectional manner according to the oxygen blowing percentage;
adding different auxiliary raw materials by stages according to the oxygen blowing percentage, the blowing temperature and the slagging condition.
TABLE 3 addition timing and amount of auxiliary materials for the converter
(5) When the blowing reaches the end point of 100 percent, the gun is lifted to finish the smelting, and the actual oxygen supply amount is 5974Nm3. The end point measurement temperature is 1648 ℃, the carbon content is 0.1328 percent, and the phosphorus content is 0.0216 percent, thereby meeting the requirements of decarburization and dephosphorization of the process and having no splashing and smoke overflow phenomena. The actual total smelting time is 15:02, which is shortened by 1:16 compared with the time 16:18 required by the original oxygen supply strength of 22000Nm 3/h.
It can be seen from the above embodiments that, by adopting the sectional type oxygen supply intensity of the converter of the invention, the basic oxygen supply flow is increased from 22000Nm3/h to 24000Nm 3/h, and the original constant-voltage variable-lance operation is optimized to the variable-pressure variable-lance operation according to the reaction stages with different carbon contents, thereby not only avoiding the problem that smoke gas is not removed by dust due to too violent carbon-oxygen reaction and smoke dust overflow, but also ensuring that the process requirements of slag-making, dephosphorization and decarburization of the converter are met, meeting the production requirements of converter smelting and realizing the shortening of the smelting period of the converter.
Claims (2)
1. A smelting method for improving the oxygen supply intensity of a converter in a sectional manner is characterized by comprising the following steps:
(1) calculating smelting oxygen blowing amount according to the total loading amount of the molten iron and the scrap steel of the converter;
(2) the converter starts to ignite and carry out gun smelting, the oxygen lance position is adjusted in a sectional mode by calculating the oxygen blowing percentage, the oxygen supply flow is adjusted in a sectional mode according to the oxygen blowing percentage, and the oxygen lance position is adjusted in a sectional mode according to the oxygen blowing percentage: when the oxygen blowing percentage is 10%, keeping the ignition slagging gun position of 2000mm, keeping the oxygen blowing percentage between 10 and 30%, reducing the gun position to 1500 plus 1600mm, heating to carry out slagging, judging the slagging condition according to the nitrogen sealing spark of a flame machine at the furnace mouth after the oxygen blowing percentage is 30%, lifting the gun position to 1750mm from 1600mm, and lifting the gun to 2000mm to carry out slagging if the oxygen blowing percentage is 65%; if no drying, maintaining the lance position at 1750mm, after the oxygen blowing percentage is 85%, gradually pressing the lance to 1300mm for decarburization, and adjusting the oxygen supply flow by the oxygen blowing percentage sectional type specifically as follows: when the percentage of oxygen blown is 10%, the flow rate of oxygen supplied is maintained at 24000Nm3H, when the oxygen blowing percentage is 10-30%, the oxygen supply flow is increased to 24000-26000Nm3The oxygen supply flow is 24000-25000Nm when the oxygen blowing percentage is 30-65 percent3The oxygen supply flow is 24000-25000Nm when the oxygen blowing percentage is 65-85 percent3After the oxygen blowing percentage is 85 percent, the oxygen supply flow is 25000-3/h；
(3) Adding auxiliary materials for smelting in the converter in sections according to the oxygen blowing percentage, adding all lime, 2000 plus 2500kg dolomite, 0-600kg magnesium balls and 1000 plus 1800kg limestone before blowing oxygen by 30%, adding the rest dolomite and limestone in batches according to a two-stage static model of the converter before blowing oxygen by 85%, adding 300 plus 1000kg magnetic separation powder before blowing oxygen by 70%, and performing corresponding adjustment according to the measured temperature of an auxiliary lance and the result of carbon determination by crystallization after blowing oxygen by 85%, so as to ensure the hit of the end point temperature and the components of molten steel;
(4) when the blowing is carried out until the oxygen supply amount is 100 percent, the gun is lifted to finish the smelting.
2. The sectional type smelting method for improving oxygen supply strength of a converter according to claim 1, wherein the total charging amount of molten iron and scrap steel in the converter in the step (1) is multiplied by 45Nm3The smelting oxygen blowing amount is obtained per ton.
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| CN202010558406.7A CN111647707B (en) | 2020-06-18 | 2020-06-18 | Smelting method for improving oxygen supply strength of converter in sectional mode |
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| CN111647707A CN111647707A (en) | 2020-09-11 |
| CN111647707B true CN111647707B (en) | 2022-03-01 |
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| CN115044729B (en) * | 2022-06-28 | 2023-11-03 | 日照钢铁控股集团有限公司 | Efficient recovery method for converter low-calorific-value gas under high scrap ratio condition |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226225A (en) * | 2011-06-08 | 2011-10-26 | 首钢总公司 | Oxygen supply lance height control method of converter for producing low-carbon and low-phosphorus steel |
| CN103266195A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | Method for improving smelting dephosphorization of converter |
| CN104762439A (en) * | 2015-03-31 | 2015-07-08 | 张家港浦项不锈钢有限公司 | Calculating method for oxygen blowing quantity of electric-arc furnace |
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- 2020-06-18 CN CN202010558406.7A patent/CN111647707B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102226225A (en) * | 2011-06-08 | 2011-10-26 | 首钢总公司 | Oxygen supply lance height control method of converter for producing low-carbon and low-phosphorus steel |
| CN103266195A (en) * | 2013-05-15 | 2013-08-28 | 武汉钢铁(集团)公司 | Method for improving smelting dephosphorization of converter |
| CN104762439A (en) * | 2015-03-31 | 2015-07-08 | 张家港浦项不锈钢有限公司 | Calculating method for oxygen blowing quantity of electric-arc furnace |
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