CN118006859A - Method for forecasting and feeding silicon molten iron into converter smelting - Google Patents
Method for forecasting and feeding silicon molten iron into converter smelting Download PDFInfo
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- CN118006859A CN118006859A CN202410180996.2A CN202410180996A CN118006859A CN 118006859 A CN118006859 A CN 118006859A CN 202410180996 A CN202410180996 A CN 202410180996A CN 118006859 A CN118006859 A CN 118006859A
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- converter
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- molten iron
- flue gas
- silicon
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- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 title claims abstract description 78
- 238000000034 method Methods 0.000 title claims abstract description 55
- 238000003723 Smelting Methods 0.000 title claims abstract description 47
- 229910052742 iron Inorganic materials 0.000 title claims abstract description 39
- 229910052710 silicon Inorganic materials 0.000 title claims abstract description 23
- 239000010703 silicon Substances 0.000 title claims abstract description 23
- XUIMIQQOPSSXEZ-UHFFFAOYSA-N Silicon Chemical compound [Si] XUIMIQQOPSSXEZ-UHFFFAOYSA-N 0.000 title abstract description 21
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims abstract description 33
- 239000003546 flue gas Substances 0.000 claims abstract description 33
- IJGRMHOSHXDMSA-UHFFFAOYSA-N Atomic nitrogen Chemical compound N#N IJGRMHOSHXDMSA-UHFFFAOYSA-N 0.000 claims abstract description 22
- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 claims abstract description 19
- 239000001301 oxygen Substances 0.000 claims abstract description 19
- 229910052760 oxygen Inorganic materials 0.000 claims abstract description 19
- CURLTUGMZLYLDI-UHFFFAOYSA-N Carbon dioxide Chemical compound O=C=O CURLTUGMZLYLDI-UHFFFAOYSA-N 0.000 claims abstract description 18
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 18
- 239000010959 steel Substances 0.000 claims abstract description 18
- 238000004868 gas analysis Methods 0.000 claims abstract description 16
- 229910052757 nitrogen Inorganic materials 0.000 claims abstract description 11
- 229910002092 carbon dioxide Inorganic materials 0.000 claims abstract description 9
- 239000001569 carbon dioxide Substances 0.000 claims abstract description 9
- 238000004458 analytical method Methods 0.000 claims abstract description 7
- XWHPIFXRKKHEKR-UHFFFAOYSA-N iron silicon Chemical compound [Si].[Fe] XWHPIFXRKKHEKR-UHFFFAOYSA-N 0.000 claims abstract description 7
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims description 10
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 10
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 6
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 6
- 239000004571 lime Substances 0.000 claims description 6
- 229910052786 argon Inorganic materials 0.000 claims description 5
- 238000004519 manufacturing process Methods 0.000 claims description 5
- 239000008188 pellet Substances 0.000 claims description 5
- 238000012935 Averaging Methods 0.000 claims description 3
- 239000007788 liquid Substances 0.000 claims description 3
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 3
- 230000000694 effects Effects 0.000 abstract description 4
- 239000000779 smoke Substances 0.000 abstract description 2
- 238000007664 blowing Methods 0.000 description 10
- 230000007423 decrease Effects 0.000 description 2
- 238000005516 engineering process Methods 0.000 description 2
- 238000012840 feeding operation Methods 0.000 description 2
- 238000009628 steelmaking Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000002826 coolant Substances 0.000 description 1
- 239000000203 mixture Substances 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000007789 sealing Methods 0.000 description 1
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- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention discloses a method for forecasting and controlling charging of molten iron and silicon in converter smelting, which comprises the following steps: (1) The converter finishes adding scrap steel and molten iron, then lowers an oxygen lance to start converting, and records time when the nitrogen content in the flue gas starts to be reduced and the carbon dioxide content starts to be synchronously increased, wherein the time is defined as the analysis starting time t 1 of the flue gas analysis system; (2) Sequentially recording the values of the CO content in the converter flue gas at intervals of 1s from the time t 1, and defining the values as W iCO; (3) The value W iCO of the CO content recorded two minutes before the start of converting in this heat was averaged to obtain an average value W ACO of the CO content, and the molten iron silicon content value W Si was calculated using the formula W Si=-0.018WACO +0.768. According to the invention, under the condition of analyzing the silicon content of different molten iron in the converter, the change rule of the smoke components in the converter smelting process is analyzed, and the silicon content prediction model is established, so that the charging operation is guided, the accurate operation of the converter smelting is realized, and the dephosphorization effect and the temperature control precision of the converter are improved.
Description
Technical Field
The invention relates to a method for forecasting and controlling charging molten iron and silicon in converter smelting, belonging to the technical field of steelmaking.
Background
For the converter smelting process, the silicon content of molten iron entering the converter directly influences the oxygen supply system and the charging system in the smelting process, and finally influences the smelting dephosphorization effect and the temperature control precision. In the actual converter smelting process, molten iron is mixed and the desulfurized molten iron sample is not fed timely, so that the problems of inaccurate silicon content or missing silicon content data of the molten iron after the converter starts converting are solved, and the feeding operation of adding lime, coolant and the like by operators is influenced, so that dephosphorization and temperature control effects are influenced. In recent years, flue gas analysis technology is gradually applied in the field of converter smelting, for example, patent application CN111518980a discloses a correction method and a correction system of a converter endpoint carbon content prediction model, patent application CN108647407a discloses a converter steelmaking flue gas analysis and carbon determination method, the method mainly carries out dynamic control and endpoint component prediction on converter smelting by analyzing the change condition of CO and CO 2 content in flue gas in the smelting process, but the patent fails to calculate the silicon content of molten iron in the converter by using the flue gas analysis result, so that the fine control of charging in the converter smelting process is realized.
Disclosure of Invention
In order to solve the problems, the invention discloses a method for forecasting and feeding molten iron silicon in a converter smelting process, which utilizes the smoke composition information in the converter smelting process to establish a method for forecasting the molten iron silicon in the converter, provides guidance for operators to carry out converter feeding operation, and improves the smelting level of the converter. The specific technical scheme is as follows:
the method for forecasting and controlling charging of molten iron and silicon in converter smelting is suitable for a converter production process provided with a flue gas analysis system, and comprises the following steps:
(1) After the converter finishes adding scrap steel and adding molten iron, the converter body is rocked to be right, the oxygen lance is lowered to start converting, the nitrogen content and the carbon dioxide content are gradually changed in the converting process, when the nitrogen content in the flue gas is lowered and the carbon dioxide content is synchronously raised, a carbon-oxygen reaction starts to occur in the converter at the moment, carbon in a molten pool is oxidized, the time is recorded, and the time is defined as the analysis starting time t 1 and s of the flue gas analysis system;
(2) Sequentially recording the values of the CO content in the converter flue gas at intervals of 1s from the time t 1, wherein the values are defined as W iCO,%;
(3) Averaging the values W iCO of the CO volume content recorded in the first two minutes from t 1 of the heat, namely t 1~t120, to obtain an average value W ACO of the CO content, and storing the average value into a database;
(4) W ACO,% > of the current heat stored in the data are read; and calculating the mass content value W Si,% of silicon in the molten iron by using a molten iron silicon content prediction model W Si=-0.018WACO +0.768.
Further, the total amount W Lime =2057 + 3500WSi and kg of lime are added in the converter smelting process; the total added amount W Pellet ball =-14839+50.9HM_WGT+7.69 HM_TEP-53.9SCRAP_WGT+ 4116 WSi and kg of pellets; HM_WGT represents the weight of molten iron into the furnace, t; SCRAP _WGT represents the weight of scrap steel, t; HM_TEP represents the temperature of the molten iron charged into the furnace, and DEG C.
Further, the total loading amount in the converter smelting process is controlled to be 125-130 t, and the scrap steel ratio is controlled to be 15-20%.
Further, the oxygen supply intensity in the converter smelting process is 3.6-4.0 Nm 3/t/min, and the oxygen flow in the smelting process is kept constant.
Further, the distance between the gun position of the oxygen lance and the liquid level of the steel is controlled to be 1.9-2.0 m in the converter smelting process.
Further, the strength of the bottom blowing argon in the converter smelting process is 0.08-0.2 Nm 3/t/min.
Further, the smelting end temperature of the converter is controlled to be 1620-1640 ℃, and the mass content of end carbon is controlled to be 0.04-0.08%.
The working principle and the beneficial effects of the invention are as follows:
For the converter smelting process, the silicon content of molten iron entering the converter directly influences the oxygen supply system and the charging system in the smelting process. Because the molten iron is combined and the desulfurized molten iron sample is not fed timely, the problem of inaccurate silicon content or missing silicon content of the molten iron after the converter starts converting is caused, and the smelting operation of the converter is affected. The flue gas analysis technology can dynamically monitor the reaction condition in the converter smelting process, but the existing method mainly focuses on forecasting the endpoint component of the converter by using flue gas data, and a method for forecasting the silicon content of molten iron entering the converter and guiding charging is not yet seen.
In order to improve converter smelting operation, the invention provides a method for forecasting the silicon content of molten iron in a converter by utilizing flue gas analysis data, and a silicon content forecasting model is established by analyzing the flue gas component change rule in the converter smelting process under the condition of different molten iron silicon contents in the converter, so that charging operation is guided, the accurate operation of converter smelting is realized, and the dephosphorization effect and the temperature control precision of the converter are improved.
Detailed Description
The invention is further elucidated below in connection with the specific embodiments. It should be understood that the following detailed description is merely illustrative of the invention and is not intended to limit the scope of the invention.
The invention is suitable for the converter production process equipped with a flue gas analysis system, and the specific process is as follows:
(1) After the converter finishes adding scrap steel and adding molten iron, the converter body is rocked to be right, the oxygen lance is lowered to start converting, the nitrogen content and the carbon dioxide content are gradually changed in the converting process, when the nitrogen content in the flue gas is lowered and the carbon dioxide content is synchronously raised, a carbon-oxygen reaction starts to occur in the converter at the moment, carbon in a molten pool is oxidized, the time is recorded, and the time is defined as the analysis starting time t 1 and s of the flue gas analysis system;
(2) Sequentially recording the values of the CO content in the converter flue gas at intervals of 1s from the time t 1, wherein the values are defined as W iCO,%;
(3) Averaging the values W iCO of the CO volume content recorded in the first two minutes from t 1 of the heat, namely t 1~t120, to obtain an average value W ACO of the CO content, and storing the average value into a database;
(4) W ACO,% > of the current heat stored in the data are read; and calculating the mass content value W Si,% of silicon in the molten iron by using a molten iron silicon content prediction model W Si=-0.018WACO +0.768.
Further, the total amount W Lime =2057 + 3500WSi and kg of lime are added in the converter smelting process; the total added amount W Pellet ball =-14839+50.9HM_WGT+7.69 HM_TEP-53.9SCRAP_WGT+ 4116 WSi and kg of pellets; HM_WGT represents the weight of molten iron into the furnace, t; SCRAP _WGT represents the weight of scrap steel, t; HM_TEP represents the temperature of the molten iron charged into the furnace, and DEG C.
The total loading amount is controlled to 125-130 t and the scrap steel ratio is controlled to 15-20% in the converter smelting process.
The oxygen supply intensity in the converter smelting process is 3.6-4.0 Nm 3/t/min, and the oxygen flow is kept constant in the smelting process.
The distance between the position of the oxygen lance and the liquid level of the steel is controlled to be 1.9-2.0 m in the converter smelting process.
The strength of bottom blowing argon in the converter smelting process is 0.08-0.2 Nm 3/t/min.
The smelting end temperature of the converter is controlled to be 1620-1640 ℃ and the mass content of the end carbon is controlled to be 0.04-0.08%.
Two examples of the invention in a specific application are given below:
Examples
Example 1
Taking a 120t converter of a steel mill of an application unit as an example, a flue gas analysis system is arranged in the production process of the converter. The converter descends an oxygen lance after the scrap steel and the molten iron are added in the heat, wherein the molten iron adding amount is 110t, the molten iron temperature is 1350 ℃, and the scrap steel adding amount is 20t. The blowing process adopts an operation mode of changing the gun position at constant pressure, the oxygen flow is 27000Nm 3/h, the bottom blowing flow is 600Nm 3/h, the nitrogen seal flow is 5400 Nm 3/h, the gun position is opened and is 2.0m, and the bottom blowing argon intensity is 0.1 Nm 3/t/min. When the open blowing time t=20s, the nitrogen content in the flue gas starts to decline, the carbon dioxide rises, the analysis time is defined as the start analysis time of the flue gas analysis system, the volume content value of CO in the flue gas is recorded every 1s afterwards, the average value of the CO content in the flue gas in the first two minutes is calculated to be 17.1%, W Si=-0.018WACO +0.768, and the mass content of silicon in the molten iron can be calculated to be 0.46% according to a formula. Calculating the lime addition amount of the heat to be 3667kg according to a formula W Lime =2057 + 3500WSi; from the formula W Pellet ball =-14839+50.9HM_WGT+7.69 HM_TEP-53.9SCRAP_WGT+ 4116 WSi, the pellet charged in the furnace was calculated to be 1878kg. The converter endpoint temperature was 1630 ℃ and the mass content of carbon was 0.05%.
Example 2
Taking a 120t converter of a steel mill of an application unit as an example, a flue gas analysis system is arranged in the production process of the converter. The converter descends an oxygen lance after the scrap steel and the molten iron are added in the heat, wherein the molten iron adding amount is 105t, the molten iron temperature is 1380 ℃, and the scrap steel adding amount is 25t. The blowing process adopts an operation mode of changing the gun position at constant pressure, the oxygen flow is 27000Nm 3/h, the bottom blowing flow is 600Nm 3/h, the nitrogen sealing flow is 5400Nm 3/h, the gun position is opened and is 1.9m, and the bottom blowing argon intensity is 0.15 Nm 3/t/min. When the open blowing time t=18s, the nitrogen content in the flue gas starts to decline, the carbon dioxide rises, the defined time is the analysis starting time of the flue gas analysis system, the content value of CO in the flue gas is recorded every 1s afterwards, the average value of the CO content in the flue gas in the first two minutes is calculated to be 13.8%, W Si=-0.018WACO +0.768, and the silicon content in the molten iron can be calculated to be 0.52% according to a formula. Calculating the lime addition amount of the heat to be 3877kg according to a formula W Lime =2057 + 3500WSi; from the formula W Pellet ball =-14839+50.9HM_WGT+7.69 HM_TEP-53.9SCRAP_WGT+ 4116 WSi, the pellet added in the furnace was calculated to be 1910kg. The converter endpoint temperature was 1625 ℃ and the mass content of carbon was 0.07%.
The technical means disclosed by the scheme of the invention is not limited to the technical means disclosed by the technical means, and also comprises the technical scheme formed by any combination of the technical features.
With the above-described preferred embodiments according to the present invention as an illustration, the above-described descriptions can be used by persons skilled in the relevant art to make various changes and modifications without departing from the scope of the technical idea of the present invention. The technical scope of the present invention is not limited to the description, but must be determined according to the scope of claims.
Claims (7)
1. A method for forecasting and controlling charging of molten iron and silicon into a converter smelting furnace, which is suitable for a converter production process provided with a flue gas analysis system, and is characterized by comprising the following steps:
(1) After the converter finishes adding scrap steel and adding molten iron, the converter body is rocked to be right, the oxygen lance is lowered to start converting, the nitrogen content and the carbon dioxide content are gradually changed in the converting process, when the nitrogen content in the flue gas is lowered and the carbon dioxide content is synchronously raised, a carbon-oxygen reaction starts to occur in the converter at the moment, carbon in a molten pool is oxidized, the time is recorded, and the time is defined as the analysis starting time t 1 and s of the flue gas analysis system;
(2) Sequentially recording the values of the CO content in the converter flue gas at intervals of 1s from the time t 1, wherein the values are defined as W iCO,%;
(3) Averaging the values W iCO of the CO volume content recorded in the first two minutes from t 1 of the heat, namely t 1~t120, to obtain an average value W ACO of the CO content, and storing the average value into a database;
(4) W ACO,%, of the current heat stored in the data are read; and calculating the mass content value W Si,% of silicon in the molten iron by using a molten iron silicon content prediction model W Si=-0.018WACO +0.768.
2. The method according to claim 1, characterized in that the total amount of lime added during the converter smelting is W Lime =2057 + 3500WSi, kg; the total added amount W Pellet ball =-14839+50.9HM_WGT+7.69 HM_TEP-53.9SCRAP_WGT+ 4116 WSi and kg of pellets; HM_WGT represents the weight of molten iron into the furnace, t; SCRAP _WGT represents the weight of scrap steel, t; HM_TEP represents the temperature of the molten iron charged into the furnace, and DEG C.
3. The method according to claim 1, wherein the total loading amount in the converter smelting process is controlled to be 125-130 t, and the scrap ratio is controlled to be 15-20%.
4. The method according to claim 1, wherein the oxygen supply intensity in the smelting process of the converter is 3.6-4.0 Nm 3/t/min, and the oxygen flow rate in the smelting process is kept constant.
5. The method according to claim 1, wherein the distance between the lance position of the oxygen lance and the steel liquid level in the converter smelting process is controlled to be 1.9-2.0 m.
6. The method according to claim 1, wherein the strength of bottom-blown argon in the converter smelting process is 0.08-0.2 Nm 3/t/min.
7. The method according to claim 1, wherein the converter smelting end temperature is controlled to be 1620-1640 ℃ and the end carbon mass content is controlled to be 0.04-0.08%.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410180996.2A CN118006859A (en) | 2024-02-18 | 2024-02-18 | Method for forecasting and feeding silicon molten iron into converter smelting |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202410180996.2A CN118006859A (en) | 2024-02-18 | 2024-02-18 | Method for forecasting and feeding silicon molten iron into converter smelting |
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| CN118006859A true CN118006859A (en) | 2024-05-10 |
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| CN202410180996.2A Pending CN118006859A (en) | 2024-02-18 | 2024-02-18 | Method for forecasting and feeding silicon molten iron into converter smelting |
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- 2024-02-18 CN CN202410180996.2A patent/CN118006859A/en active Pending
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