CN114921607A - Method for reducing oxygen content at smelting end point of converter - Google Patents
Method for reducing oxygen content at smelting end point of converter Download PDFInfo
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- CN114921607A CN114921607A CN202210453250.5A CN202210453250A CN114921607A CN 114921607 A CN114921607 A CN 114921607A CN 202210453250 A CN202210453250 A CN 202210453250A CN 114921607 A CN114921607 A CN 114921607A
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- QVGXLLKOCUKJST-UHFFFAOYSA-N atomic oxygen Chemical compound [O] QVGXLLKOCUKJST-UHFFFAOYSA-N 0.000 title claims abstract description 95
- 239000001301 oxygen Substances 0.000 title claims abstract description 95
- 229910052760 oxygen Inorganic materials 0.000 title claims abstract description 95
- 238000003723 Smelting Methods 0.000 title claims abstract description 58
- 238000000034 method Methods 0.000 title claims abstract description 38
- 238000007664 blowing Methods 0.000 claims abstract description 99
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 72
- 239000010959 steel Substances 0.000 claims abstract description 72
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims abstract description 46
- 229910052799 carbon Inorganic materials 0.000 claims abstract description 46
- VVTSZOCINPYFDP-UHFFFAOYSA-N [O].[Ar] Chemical compound [O].[Ar] VVTSZOCINPYFDP-UHFFFAOYSA-N 0.000 claims abstract description 30
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 claims abstract description 26
- 230000000295 complement effect Effects 0.000 claims abstract description 16
- 229910052786 argon Inorganic materials 0.000 claims abstract description 13
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 claims abstract description 8
- 229910052742 iron Inorganic materials 0.000 claims abstract description 4
- CSJDCSCTVDEHRN-UHFFFAOYSA-N methane;molecular oxygen Chemical compound C.O=O CSJDCSCTVDEHRN-UHFFFAOYSA-N 0.000 claims description 13
- 238000009628 steelmaking Methods 0.000 claims description 13
- 238000010079 rubber tapping Methods 0.000 claims description 12
- 239000000047 product Substances 0.000 claims description 8
- 238000005070 sampling Methods 0.000 claims description 8
- 238000009529 body temperature measurement Methods 0.000 claims description 6
- 239000007789 gas Substances 0.000 claims description 6
- 238000005261 decarburization Methods 0.000 claims description 5
- 238000009792 diffusion process Methods 0.000 claims description 4
- UGFAIRIUMAVXCW-UHFFFAOYSA-N Carbon monoxide Chemical compound [O+]#[C-] UGFAIRIUMAVXCW-UHFFFAOYSA-N 0.000 claims description 3
- 235000008733 Citrus aurantifolia Nutrition 0.000 claims description 3
- 235000011941 Tilia x europaea Nutrition 0.000 claims description 3
- 229910002091 carbon monoxide Inorganic materials 0.000 claims description 3
- 238000001514 detection method Methods 0.000 claims description 3
- 239000010459 dolomite Substances 0.000 claims description 3
- 229910000514 dolomite Inorganic materials 0.000 claims description 3
- 239000004571 lime Substances 0.000 claims description 3
- 238000005259 measurement Methods 0.000 claims description 3
- OAICVXFJPJFONN-UHFFFAOYSA-N Phosphorus Chemical compound [P] OAICVXFJPJFONN-UHFFFAOYSA-N 0.000 claims description 2
- 230000005540 biological transmission Effects 0.000 claims description 2
- 239000000428 dust Substances 0.000 claims description 2
- 229910052698 phosphorus Inorganic materials 0.000 claims description 2
- 239000011574 phosphorus Substances 0.000 claims description 2
- 239000000779 smoke Substances 0.000 claims description 2
- 239000013589 supplement Substances 0.000 claims description 2
- QRSFFHRCBYCWBS-UHFFFAOYSA-N [O].[O] Chemical compound [O].[O] QRSFFHRCBYCWBS-UHFFFAOYSA-N 0.000 claims 1
- 239000002699 waste material Substances 0.000 abstract description 6
- 239000002994 raw material Substances 0.000 abstract 1
- CPLXHLVBOLITMK-UHFFFAOYSA-N Magnesium oxide Chemical compound [Mg]=O CPLXHLVBOLITMK-UHFFFAOYSA-N 0.000 description 4
- 239000011449 brick Substances 0.000 description 4
- 238000003756 stirring Methods 0.000 description 4
- 238000006243 chemical reaction Methods 0.000 description 3
- 239000000463 material Substances 0.000 description 3
- 239000002893 slag Substances 0.000 description 3
- WUKWITHWXAAZEY-UHFFFAOYSA-L calcium difluoride Chemical compound [F-].[F-].[Ca+2] WUKWITHWXAAZEY-UHFFFAOYSA-L 0.000 description 2
- 230000003749 cleanliness Effects 0.000 description 2
- 239000010436 fluorite Substances 0.000 description 2
- 239000000395 magnesium oxide Substances 0.000 description 2
- 238000002156 mixing Methods 0.000 description 2
- 239000000523 sample Substances 0.000 description 2
- 239000000956 alloy Substances 0.000 description 1
- 229910045601 alloy Inorganic materials 0.000 description 1
- 230000009286 beneficial effect Effects 0.000 description 1
- 238000000071 blow moulding Methods 0.000 description 1
- 230000008021 deposition Effects 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 230000003628 erosive effect Effects 0.000 description 1
- 238000001914 filtration Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005272 metallurgy Methods 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
- 238000000465 moulding Methods 0.000 description 1
- 230000000737 periodic effect Effects 0.000 description 1
- 238000004886 process control Methods 0.000 description 1
Images
Classifications
-
- 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
- C21C5/35—Blowing from above and through the bath
-
- 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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/068—Decarburising
-
- 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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
-
- 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 a method for reducing oxygen content at a smelting end point of a converter, which comprises the steps of designing an argon-oxygen mixed blowing model and a complementary blowing model, after raw materials such as hot molten iron, waste steel and the like are added into the converter, starting the argon-oxygen mixed blowing model when the carbon content in steel is blown to be in a range of 0.20-0.50%, adjusting the flow of oxygen and argon according to the model to carry out blowing, automatically calculating the blowing end point, carrying out complementary blowing through the complementary blowing model if the temperature or the components do not meet the requirements, and stopping smelting if the temperature or the components meet the requirements.
Description
Technical Field
The invention relates to the technical field of metallurgy, in particular to a method for reducing the oxygen content of a converter smelting end point.
Background
When the steel is smelted in the converter, the oxygen content of the molten steel at the end point directly determines the consumption of the steel material, the consumption of the deoxidized alloy and the cleanliness of the molten steel. According to the steel slag interface reaction equilibrium, the higher the oxygen content in the molten steel is, the higher the T.Fe content in the slag is, and the consumption of steel materials is increased; the higher the oxygen content in the molten steel is, the more the deoxidizer is consumed, and simultaneously, the deoxidized products in the molten steel are increased, and the cleanliness of the molten steel is deteriorated. In order to ensure that the carbon content and the temperature of the smelting end point of the converter reach the target and the molten steel has lower oxygen content, the reduction of the carbon-oxygen product of the molten steel becomes an important method for reducing the end point oxygen content.
After examining the prior related technical documents, the prior art has been reported in patent documents that the end point oxygen content is reduced by reducing the end point carbon oxygen product, but there is no related document that the end point oxygen content of the converter is reduced without reducing the stirring strength of the molten steel and prolonging the smelting period by designing an argon oxygen mixed blowing model.
CN109182640A 'A method for reducing the carbon oxygen deposit at the end point of converter smelting', discloses a method for reducing the carbon oxygen deposit at the end point of converter smelting, which adds 1.1-1.2 kg/t of crushed waste magnesia carbon bricks and fluorite into a converter at the middle and later stages of converter smelting (the temperature of molten steel is more than or equal to 1500 ℃), thus achieving the purpose of reducing the carbon oxygen deposit at the end point of converter smelting. However, the added fluorite has serious erosion to the furnace lining, the service life of the furnace lining is reduced, and the added magnesia carbon bricks are not easy to melt and cause the increase of slag amount.
CN109825664A method for reducing carbon and oxygen deposit at the smelting end point of a converter discloses a method for reducing carbon and oxygen deposit at the smelting end point of a patent, and the method achieves the purpose of reducing the carbon and oxygen deposit at the smelting end point of the converter by prolonging the bottom blowing stirring time after the smelting is finished. However, the method requires high bottom blowing strength and long time, influences the service life of the bottom blowing bricks, and ensures that the bottom blowing bricks are easy to block after the service life of the converter lining reaches 4000 furnaces, thereby causing unstable bottom blowing flow, prolonging the smelting period and the like.
Disclosure of Invention
The invention aims to provide a method for reducing the smelting end point oxygen content of a converter, which comprises the steps of designing an argon-oxygen mixed blowing model and a complementary blowing model, starting the argon-oxygen mixed blowing model when the converter blows the carbon content in steel to the range of 0.20-0.50%, adjusting the oxygen flow according to the model to carry out blowing, stopping blowing after the carbon content calculated by the model reaches a set value, carrying out complementary blowing through the complementary blowing model if the temperature or the components do not meet the requirements, and carrying out steel tapping if the temperature or the components meet the requirements. The oxygen pressure is reduced in the whole blowing process without reducing the stirring intensity, so that the oxygen pressure and carbon-oxygen reaction reach an equilibrium state, and the carbon-oxygen product of the molten steel is reduced under the condition of not prolonging the smelting period, thereby reducing the smelting end-point oxygen content of the converter.
In order to achieve the purpose, the invention provides the following technical scheme:
a method for reducing the oxygen content at the smelting end point of a converter comprises the following steps:
the first step is as follows: adding scrap steel meeting the steel grade requirement into a scrap steel hopper in a scrap steel field, adding the scrap steel into a converter by using a crown block, and then charging molten iron with the weight and components meeting the steel grade requirement into the converter;
the second step is that: blowing by top blowing oxygen and bottom blowing argon after the converter is shaken, wherein the oxygen supply intensity of a top blowing oxygen lance is 3.0-4.0 m 3/min.t, the gas pressure is 0.65-1.05 MPa, the lance position of the oxygen lance is 1.4-2.0 m, the bottom blowing gas supply intensity is 0.01-0.12 Nm 3/t.min, and the pressure is 0.2-1.7 MPa; in the blowing process, lime, light burned dolomite and return fine are added into an overhead bunker to carry out slagging;
the third step: if the converter has an automatic steelmaking model, judging whether the decarburization rate in the model is reduced to a target value, if so, stopping blowing, automatically starting an argon-oxygen mixed blowing model, measuring the temperature and the oxygen by using a sublance, and transmitting the information of the carbon content, the oxygen content and the temperature measured by the sublance to the argon-oxygen mixed blowing model;
the fourth step: if no automatic steelmaking model exists, manually judging whether the carbon content in the steel reaches 0.20-0.50% according to the experience of flame, smoke dust, sparks and the like at a furnace mouth, manually controlling to start an argon-oxygen mixed blowing model, and inputting the carbon content and the temperature which are judged by experience into the model;
the fifth step: after the argon oxygen mixed blow mold is opened, automatically adjusting the pressure, flow and total oxygen supply amount of argon and oxygen according to the calculation of the argon oxygen mixed blow mold;
and a sixth step: automatically judging whether the oxygen supply amount reaches a set target of a molten steel smelting end point or not by the model, and stopping blowing if the calculated value is met; in the running process of the model, the step of manually intervening and stopping blowing can be carried out when the operator empirically judges that the end point sample is reached;
the seventh step: after blowing is stopped, carrying out furnace shaking, carrying out temperature measurement and sampling on the molten steel, and detecting components by using a spectrometer;
eighth step: calculating the blowing-in air pressure, flow and time by a blowing-in model according to the component detection result and the temperature to carry out blowing, and repeating the seventh step to the eighth step after the blowing is finished;
the ninth step: and after charging is finished each time, starting to transmit signals to the argon oxygen blowing model when blowing is started, and when the target is reached, controlling the smelting end point of the second furnace converter along the steps from the third step to the eighth step, and repeating the steps.
As a further embodiment of the present invention, the argon-oxygen mixed blowing model in the third step is:
in molten steel, [ C ]]Diffusion rate:
in molten steelO]Input rate:
constraint conditions are as follows:
an objective function:
as a further aspect of the present invention, the complementary blowing model in the eighth step is:
the temperature is less than the target value: partial pressure of oxygen
The carbon content is less than the target value: partial pressure of oxygen
Oxygen supply time:
gun position: h is 1.4-1.6 m.
As a further scheme of the invention, the automatic steelmaking model in the third step is a model for automatically calculating the main parameter changes of temperature and carbon content in the smelting process of the converter and controlling the lance position and flow of an oxygen lance to perform automatic steelmaking; the sublance is a tool for sampling, measuring temperature and determining the content of carbon and phosphorus in the furnace without turning down the furnace in the final stage of automatic steelmaking blowing.
As a further scheme of the invention, the manual intervention in the sixth step means that the blowing-out can be manually controlled when the smelting end point is reached or other reasons need to be judged according to experience in the smelting process, the argon oxygen mixed blow molding operation is forcibly stopped, and the blowing is finished.
As a further embodiment of the present invention, in the argon-oxygen mixture blowing model in the third step
Is the diffusion rate of carbon;
is [ O ] in molten steel]The transmission rate of (c); w [ c ]]The carbon content in the molten steel;
is the carbon monoxide partial pressure;
the oxygen partial pressure in the oxygen lance is obtained; w [ C ] Z ]The target carbon content in the molten steel; m is Steel The weight of molten steel in the furnace; q is the gas supply flow of the top-blown oxygen lance.
As a further aspect of the present invention, in the complementary blowing model in the eighth step, w [ C ] i ]The carbon content of the molten steel before the ith complementary blowing is determined; w [ C ] Z ]The target carbon content of the molten steel; t is t Supplement device The blowing time is the supplementary blowing time; h is the position of the top-blown oxygen lance.
As a further scheme of the invention, in the step seven, in the components detected by the spectrometer, if the components and the temperature meet the requirements, the tapping operation is stopped during smelting, and if the end point requirements are not met, the end point complementary blowing model is started.
The blowing step in the eighth step is as follows:
firstly, the gun position is 1.6m, the oxygen flow is 12800Nm3/h, the argon flow is 19200Nm3/h, and the complementary blowing time is 20.8 s;
II, performing secondary filtration; carrying out temperature measurement sampling by a sublance after converting is finished, wherein the TSO measurement result is as follows: the temperature is 1649 ℃, the carbon content is 0.10 percent, the oxygen content is 204ppm, the carbon-oxygen product reaches 0.00204, the requirement of Q355B steel tapping is met, steel tapping is carried out, and the blowing of the furnace is finished.
As a further aspect of the present invention, the decarburization rate in the third step is 3 to 8 kg/s.
Compared with the prior art, the invention has the following beneficial effects:
(1) establishing an argon-oxygen mixed blowing model and a complementary blowing model for automatic end point control by utilizing the turning point that the deoxidation rate is obviously changed when the carbon content in the molten steel reaches the critical carbon content;
(2) keeping the total flow of the top-blowing oxygen lance unchanged, reducing the partial pressure of oxygen by mixing argon into the oxygen lance, reducing the partial pressure of carbon monoxide in the carbon-oxygen reaction process, and reducing the carbon-oxygen deposition in molten steel while ensuring that the stirring strength in the converter is unchanged, thereby reducing the oxygen content at the steelmaking end point of the converter;
(3) the method for reducing the oxygen content at the smelting end point of the converter is easy to operate and control, high in automation degree, safe and reliable, and obvious in use effect.
Drawings
The invention is further illustrated with reference to the following figures and examples.
FIG. 1 is a schematic diagram of a converter smelting process flow of the present invention.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention. In addition, for the convenience of description, the following references to "upper", "lower", "left" and "right" are to be construed as referring to the upper, lower, left, right, etc. direction of the attached drawings, and the following references to "first", "second", etc. are to be distinguished for descriptive purposes and not for other specific meanings.
The invention provides a method for reducing the oxygen content of molten steel at the end point of a converter through argon-oxygen mixed blowing molding. According to the method, when the carbon content of the molten steel is blown to 0.20-0.50% through the converter, argon oxygen mixed blowing mold type controlled end-point smelting is started, and the carbon oxygen product of the molten steel is reduced, so that the purpose of reducing the end-point oxygen content of the molten steel is achieved. The following detailed description further describes the invention in detail.
In the embodiment, the actual production process control of smelting a furnace Q355B by adopting a 150t converter is taken as an example, wherein the process control comprises an automatic steelmaking model and a sublance, the flow rate of an oxygen lance is 28000-36000 m3/h, and the end point requirement is as follows: the tapping temperature is 1620-1680 ℃, and the tapping carbon content is 0.08-0.12%. The method for reducing the oxygen content at the smelting end point of the converter comprises the following steps:
the first step is as follows: loading 11 tons of heavy waste steel, 4 tons of internal self-produced waste steel, 3 tons of crushed materials and 2 tons of waste steel into a converter through a scrap steel bucket lifted by an overhead crane in a waste steel field, and then loading 135 tons of molten iron into the converter;
the second step: starting blowing after the converter is shaken, keeping the flow rate of a top-blown oxygen lance 18000Nm3/h, the lance position at 1.9m and the flow rate of bottom-blown argon at 350Nm3/h for 60 seconds, gradually increasing the flow rate of the top-blown oxygen lance to 32000Nm3/h, gradually reducing the lance position to 1.6m and gradually increasing the flow rate of the bottom-blown argon to 540Nm3/h during 60-100 seconds, and then adopting an automatic control mode; 2 tons of lime, 1 ton of light-burned dolomite, 1 ton of return mine and the like are added into an overhead bunker for slagging;
the third step: according to the automatic steel-making model, when the decarburization rate is reduced to 5kg/s, stopping blowing, measuring the temperature and the carbon by using a sublance, measuring the temperature of 1586 ℃ and the carbon content of 0.322%, and transmitting the information of the carbon content and the temperature measured by the sublance to an argon-oxygen mixed blowing model;
the fourth step: the argon-oxygen mixed blowing model is automatically started, the initial oxygen flow rate is 30400Nm3/h and the argon flow rate is 1600Nm3/h according to the information of the loading amount, the temperature, the oxygen content, the carbon content and the like, and the argon-oxygen mixed blowing model automatically controls and adjusts the flow rates, the total demand and the blowing time of oxygen and argon in real time along with the reduction of the carbon content;
the fifth step: after the argon-oxygen mixing model is started, automatically judging whether the oxygen supply amount reaches a calculation target value by the model, and if the oxygen supply amount meets the calculation requirement, stopping blowing;
and a sixth step: after blowing is stopped, carrying out furnace shaking, carrying out temperature measurement sampling on the molten steel, and detecting components by using a spectrometer, wherein the result temperature is 1642 ℃, and the carbon content is 0.15%;
the seventh step: starting a terminal blowing-supplementing model when the temperature meets the tapping requirement but the carbon content is higher;
eighth step: according to the component detection result and the temperature, the blowing-in air pressure, the flow and the time of blowing-in are calculated by a blowing-in model to carry out blowing, wherein the gun position is 1.6m, the oxygen flow is 12800Nm3/h, the argon flow is 19200Nm3/h, and the blowing-in time is 20.8 s; after blowing is finished, temperature measurement sampling is carried out by a sublance (TSO probe), and TSO measurement results are as follows: the temperature is 1649 ℃, the carbon content is 0.10 percent, the oxygen content is 204ppm, the carbon oxygen product reaches 0.00204, the requirement of Q355B steel tapping is met, steel tapping is carried out, and the blowing of the furnace is finished;
the ninth step: and the like, and carrying out periodic operation by virtue of smelting and end point control of each furnace.
The above description is only for the purpose of illustrating the preferred embodiments of the present invention and is not to be construed as limiting the invention, and any modifications, equivalents and improvements made within the spirit and principle of the present invention are intended to be included within the scope of the present invention.
Claims (10)
1. A method for reducing the oxygen content at the smelting end point of a converter is characterized by comprising the following steps: the method for smelting the end-point oxygen content of the converter comprises the following steps:
the first step is as follows: adding scrap steel meeting the steel grade requirement into a scrap steel hopper in a scrap steel field, adding the scrap steel into a converter by using a crown block, and then charging molten iron with the weight and components meeting the steel grade requirement into the converter;
the second step is that: blowing by top blowing oxygen and bottom blowing argon after the converter is shaken, wherein the oxygen supply intensity of a top blowing oxygen lance is 3.0-4.0 m 3/min.t, the gas pressure is 0.65-1.05 MPa, the lance position of the oxygen lance is 1.4-2.0 m, the bottom blowing gas supply intensity is 0.01-0.12 Nm 3/t.min, and the pressure is 0.2-1.7 MPa; in the blowing process, lime, light burned dolomite and return fine are added into an overhead bunker to carry out slagging;
the third step: if the converter has an automatic steelmaking model, judging whether the decarburization rate in the model is reduced to a target value, if so, stopping blowing, automatically starting an argon-oxygen mixed blowing model, measuring the temperature and determining the carbon and the oxygen by using a sublance, and transmitting the information of the carbon content, the oxygen content and the temperature measured by the sublance to the argon-oxygen mixed blowing model;
the fourth step: if no automatic steelmaking model exists, manually judging whether the carbon content in the steel reaches 0.20-0.50% according to the experience of flame, smoke dust, sparks and the like at a furnace mouth, manually controlling to start an argon-oxygen mixed blowing model, and inputting the carbon content and the temperature which are judged by experience into the model;
the fifth step: after the model of the argon-oxygen hybrid blowing is opened, automatically adjusting the pressure, flow and total oxygen supply quantity of argon and oxygen according to the calculation of the model of the argon-oxygen hybrid blowing;
and a sixth step: automatically judging whether the oxygen supply amount reaches a set target of a molten steel smelting end point or not by the model, and stopping blowing if the calculated value is met; in the running process of the model, the step of manually intervening and stopping blowing can be carried out when the operator empirically judges that the end point sample is reached;
the seventh step: after blowing is stopped, carrying out furnace shaking, carrying out temperature measurement and sampling on the molten steel, and detecting components by using a spectrometer;
eighth step: calculating the blowing-in air pressure, flow and time by a blowing-in model according to the component detection result and the temperature to carry out blowing, and repeating the seventh step to the eighth step after the blowing is finished;
the ninth step: and after charging is finished each time, starting to transmit signals to the argon oxygen blowing model when blowing is started, and when the target is reached, controlling the smelting end point of the second furnace converter along the steps from the third step to the eighth step, and repeating the steps.
2. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: the argon-oxygen mixed blowing model in the third step is as follows:
in molten steel, [ C ]]Diffusion rate:
in molten steel [ O ]]Input rate:
constraint conditions are as follows:
an objective function:
3. the method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: the blowing-supplementing model in the eighth step is as follows:
the temperature is less than the target value: partial pressure of oxygen
The carbon content is less than the target value: partial pressure of oxygen
Oxygen supply time:
gun position: h is 1.4-1.6 m.
4. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: the automatic steelmaking model in the third step is a model for automatically calculating the main parameter changes of temperature and carbon content in the converter smelting process and controlling the lance position and flow of an oxygen lance to carry out automatic steelmaking; the sublance is a tool for sampling, measuring temperature and determining the content of carbon and phosphorus in the furnace without turning down the furnace in the final stage of automatic steelmaking blowing.
5. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: and the manual intervention in the sixth step is that the blowing-out can be manually controlled when the smelting end point is reached or other reasons need to be judged according to experience in the smelting process, the argon oxygen mixed blowing mould operation is forcibly stopped, and the blowing is finished.
6. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows:in the argon-oxygen mixed blowing model in the third step
Is the diffusion rate of carbon;
is [0 ] in molten steel]The transmission rate of (c); w [ c ]]The carbon content in the molten steel;
is the carbon monoxide partial pressure;
the oxygen partial pressure in the oxygen lance is obtained; w [ C ] Z ]The target carbon content in the molten steel; m is Steel Is the weight of molten steel in the furnace; q is the gas supply flow of the top-blown oxygen lance.
7. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: in the complementary blowing model in the eighth step, w [ C ] i ]The carbon content of the molten steel before the ith complementary blowing is determined; w [ C ] Z ]The target carbon content of the molten steel; t is t Supplement device The blowing time is the supplementary blowing time; h is the position of the top-blown oxygen lance.
8. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: and in the seventh step, in the components detected by the spectrometer, if the components and the temperature meet the requirements, stopping smelting to carry out tapping operation, and if the components and the temperature do not meet the end point requirement, starting an end point complementary blowing model.
9. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: the blowing step in the eighth step is as follows:
firstly, the gun position is 1.6m, the oxygen flow is 12800Nm3/h, the argon flow is 19200Nm3/h, and the complementary blowing time is 20.8 s;
II, performing secondary treatment; carrying out temperature measurement sampling by a sublance after converting is finished, wherein a TSO measurement result is as follows: the temperature is 1649 ℃, the carbon content is 0.10 percent, the oxygen content is 204ppm, the carbon oxygen product reaches 0.00204, the requirement of Q355B steel tapping is met, the steel tapping is carried out, and the blowing of the furnace is finished.
10. The method for reducing the oxygen content at the smelting end point of the converter according to claim 1, wherein the oxygen content at the smelting end point of the converter is as follows: the decarburization rate in the third step is 3.0 to 8.0 kg/s.
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