CN113930573A - Bottom blowing instantaneous flow dynamic control method of top-bottom combined blown converter - Google Patents
Bottom blowing instantaneous flow dynamic control method of top-bottom combined blown converter Download PDFInfo
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- CN113930573A CN113930573A CN202111050206.1A CN202111050206A CN113930573A CN 113930573 A CN113930573 A CN 113930573A CN 202111050206 A CN202111050206 A CN 202111050206A CN 113930573 A CN113930573 A CN 113930573A
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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
- C21C5/35—Blowing from above and through the bath
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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
- C21C2300/00—Process aspects
- C21C2300/06—Modeling of the process, e.g. for control purposes; CII
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- 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
- Y02P10/25—Process efficiency
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Abstract
The invention provides a bottom blowing instantaneous flow dynamic control method of a top and bottom combined blown converter, which comprises the steps of acquiring, analyzing and fitting bottom blowing instantaneous flow historical data of each task time period and any time in the production of the top and bottom combined blown converter by calling the historical data, feeding back and correcting by combining the fluctuation condition of each relevant parameter in a near time period definition range, and establishing a dynamic model to calculate the instantaneous flow of the bottom blowing flow at a certain time. The dynamic control of bottom blowing instantaneous flow at any time in each time stage of converter production is realized, the top and bottom combined blowing effect is effectively improved, the carbon-oxygen deposit at the blowing end point is reduced, and the metal yield and the molten steel quality are improved.
Description
Technical Field
The invention relates to the technical field of converter steelmaking, in particular to a bottom blowing instantaneous flow dynamic control method of a top-bottom combined blown converter.
Background
The top-bottom composite blowing of converter is a new technological process developed in the last 70 th century in the world steel-making field.
At present traditional bottom blowing control system, according to target smelting steel grade simply divide into whole argon blowing to the difference of nitrogen content, nitrogen argon switches, the three kinds of modes of full name nitrogen blowing, perhaps carry out manual intervention adjustment or switching according to particular case, upgrade into 9 kinds or more modes according to three kinds of modes a bit, nevertheless still be difficult to effectively solve the converting in-process bottom blowing flow ratio relatively fixed, single problem overall, can not in time adjust or revise according to the actual conditions of raw materials condition or converting state, cause the converting to return futilely or the splash number of times reduces, lead to the unable even running of converter.
In the prior art, in published application No. 201610741393.0 "an automatic control method for bottom blowing mode of combined blown converter", control buttons corresponding to different bottom blowing modes are arranged on an operation interface of a control system, and the bottom blowing mode is selected by manually clicking the control buttons; bottom blowing control according to the operation state of the converter cannot be realized, and effective exertion of top-bottom combined blowing effect is limited.
Disclosure of Invention
The invention provides a bottom blowing instantaneous flow dynamic control method of a top-bottom combined blown converter, which realizes bottom blowing control according to the running state of the converter and avoids the problem of limiting the effective exertion of the top-bottom combined blown effect.
The method comprises the following steps: acquiring bottom blowing flow historical data of each time point of the converter with preset duration;
measuring the liquid level, the carbon content, the oxygen content and the temperature of a molten pool at each time point of the converter with preset time length by using a converter sublance, calling the service life parameter data of the converter, and calculating the average value;
acquiring instantaneous bottom blowing flow of the converter at each time point of the converter with preset time length, namely the corresponding instantaneous flow F (t) at any time on a time axis in converter blowing preparation, blowing, tapping, slag splashing protection, empty furnace and maintenance states;
F(t)＝F0+(A-A0)×η0+(M/M0-1)×0.0025×η1-B×η2+T×η3
wherein the content of the first and second substances,
F0: a data fitting value of the bottom blowing flow historical data at a certain moment; unit: m is3/h；
A: the liquid level of a molten pool measured by a sublance at the last converting end point; unit: cm;
A0: theoretical liquid level of the molten pool; unit: cm;
η0: a molten pool liquid level correction coefficient which is a molten pool liquid level correction value based on a preset number of tapping historical data;
m ═ C ] x [ O ], which is the contents of [ C ] and [ O ] measured by the last converting end sublance, namely carbon-oxygen product;
[C] the unit of (A) is%, [ O ] is ppm;
M0: data fitting values of furnace carbon oxygen product historical data;
η1: carbon-oxygen product correction values based on a preset number of tapping historical data;
b: the converter life of the blowing heat;
η2: a converter life correction value based on a preset number of tapping historical data;
t is the temperature of a molten pool measured by a sublance at the last converting end point;
η3: based on preAnd setting a quantity of molten pool temperature correction values of the tapping historical data.
It should be further noted that the bottom blowing flow historical data of each time point of the converter with the preset time duration is subjected to data fitting.
Performing data fitting on the bottom blowing flow historical data through a flow curve fitting function provided by an MATLAB module;
the data fitting value calculation mode is as follows:
F0＝polyval(a,t),a＝polyfit(tdata,Fdata,n)；
n represents the highest order of the polynomial, tdata and Fdata are data to be fitted and are input in an array mode.
The furnace number of the preset number of furnace discharge historical data is 50 to 60.
It should be further noted that, when the measurement of the sublance fails, the values are: t is 1650 deg.C, A is A0，M＝[C]×[O]＝0.0025。
Further, when the furnace life was 8000 to 8500, the average carbon-oxygen product was decreased from 0.00266 to 0.00253 at an end point w ([ C ]) of 0.07 wt% at 1640 ℃.
According to the technical scheme, the invention has the following advantages:
the invention provides a dynamic control method of bottom blowing instantaneous flow of a top-bottom combined blown converter based on data fitting, which collects, analyzes and fits the historical data of the bottom blowing instantaneous flow at each task time period and any time in the production of the top-bottom combined blown converter by calling the historical data, and feeds back and corrects the fluctuation condition of each relevant parameter in the near time period definition range to establish a dynamic model to calculate the instantaneous flow at a certain time of the bottom blowing flow. The dynamic control of bottom blowing instantaneous flow at any time in each time stage of converter production is realized, the top and bottom combined blowing effect is effectively improved, the carbon-oxygen deposit at the blowing end point is reduced, and the metal yield and the molten steel quality are improved.
Drawings
In order to more clearly illustrate the technical solution of the present invention, the drawings used in the description will be briefly introduced, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and it is obvious for those skilled in the art that other drawings can be obtained based on these drawings without creative efforts.
FIG. 1 is a graph illustrating an embodiment of a method for dynamically controlling bottom-blowing instantaneous flow;
FIG. 2 is a second graph of an embodiment of a method for dynamically controlling the instantaneous bottom-blowing flow rate.
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.
The elements and algorithm steps of the examples described in the embodiments of the method for dynamically controlling instantaneous flow rate of bottom blowing of a top-bottom combined blown converter based on data fitting provided by the present invention can be realized by electronic hardware, computer software or a combination of the two. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
In the method for dynamically controlling the bottom-blowing instantaneous flow of the top-bottom combined blown converter based on data fitting, which is provided by the invention, it should be understood that the disclosed system, device and method can be realized in other ways. For example, the above-described apparatus embodiments are merely illustrative, and for example, the division of the units is only one logical division, and other divisions may be realized in practice, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may also be an electric, mechanical or other form of connection.
The invention provides a data fitting-based bottom blowing instantaneous flow dynamic control method of a top-bottom combined blown converter, which comprises the following steps:
acquiring bottom blowing flow historical data of each time point of the converter with preset duration;
measuring the liquid level, the carbon content, the oxygen content and the temperature of a molten pool at each time point of the converter with preset time length by using a converter sublance, calling the service life parameter data of the converter, and calculating the average value;
the sublance is the most main device for dynamically controlling the computer of the converter, the sublance is a water-cooled three-layer steel pipe, the lower end of the sublance is provided with a probe electrode clamp which is triggered once, and a sublance test probe is arranged on the electrode clamp. The probe of the sublance is placed in the molten steel to monitor the molten steel condition, and molten steel data can be obtained.
Acquiring instantaneous bottom blowing flow of the converter at each time point of the converter with preset time length, namely the corresponding instantaneous flow F (t) at any time on a time axis in converter blowing preparation, blowing, tapping, slag splashing protection, empty furnace and maintenance states;
F(t)＝F0+(A-A0)×η0+(M/M0-1)×0.0025×η1-B×η2+T×η3
wherein the content of the first and second substances,
F0: a data fitting value of the bottom blowing flow historical data at a certain moment; unit: m is3/h；
And (3) presetting the bottom blowing flow historical data of each time point of the converter for a preset time length, and performing data fitting on the bottom blowing flow historical data.
Performing data fitting on the bottom blowing flow historical data through a flow curve fitting function provided by an MATLAB module;
the data fitting value calculation mode is as follows:
F0＝polyval(a,t),a＝polyfit(tdata,Fdata,n)；
n represents the highest order of the polynomial, tdata and Fdata are data to be fitted and are input in an array mode.
A: the liquid level of a molten pool measured by a sublance at the last converting end point; unit: cm;
A0: theoretical liquid level of the molten pool; unit: cm;
η0: a molten pool liquid level correction coefficient which is a molten pool liquid level correction value based on a preset number of tapping historical data;
m ═ C ] x [ O ], which is the contents of [ C ] and [ O ] measured by the last converting end sublance, namely carbon-oxygen product;
[C] the unit of (A) is%, [ O ] is ppm;
M0: data fitting values of furnace carbon oxygen product historical data;
η1: carbon-oxygen product correction values based on a preset number of tapping historical data;
b: the converter life of the blowing heat;
η2: a converter life correction value based on a preset number of tapping historical data;
t is the temperature of a molten pool measured by a sublance at the last converting end point;
η3: and the temperature correction value of the molten pool is based on the preset amount of tapping historical data.
Values when the sublance measurement fails are: t is 1650 deg.C, A is A0，M＝[C]×[O]＝0.0025。
According to the invention, through top-bottom combined blowing, the decarburization reaction in the converter blowing process is effectively promoted, the carbon-oxygen balance is promoted, the blowing process is more stable, the metal content in slag is reduced, the metal yield is improved, the oxygen content in the steel at the blowing end point is further reduced, the residual manganese content in molten steel is improved, and the alloy consumption and the deoxidizer cost are reduced.
The number of the furnaces of the preset quantity of the tapping history data related to the invention is 50 to 60. Of course, it is also possible to use 70 to 90 furnaces, depending on the actual operating state.
The invention realizes the dynamic control of the bottom blowing instantaneous flow of the top-bottom combined blown converter based on data fitting, effectively avoids the abnormal situations of drying back and splashing in the blowing process, ensures the stable blowing and further promotes the carbon-oxygen balance at the blowing end point. The results of comparison of the end point carbon-oxygen products before and after the implementation showed that when the furnace life was about 8000, the average value of the carbon-oxygen products decreased from 0.00266 to 0.00253, which was 0.00013, and the optimized value was more stable, at an end point w ([ C ]) of 0.07 wt% and a temperature of 1640 ℃.
The dynamic conditions of a molten pool are effectively improved through the dynamic control of the bottom blowing instantaneous flow of the top-bottom combined blown converter based on data fitting, so that the nonuniformity of components and temperature in the molten pool is remarkably improved, the carbon-oxygen reaction is further close to balance, the peroxidation of molten steel is avoided, and the analysis and comparison of the components of the end-point slag sample show that the w (TFe) in the optimized end-point slag sample is reduced by 2.6 wt%, so that the metal loss in the slag is reduced, and the yield of metal and alloy is improved;
according to the invention, through improvement of dynamic conditions of a molten pool, heat transfer and mass transfer in a blowing process are promoted, an interface reaction between steel and slag is accelerated, the problem of large gradient fluctuation of molten pool temperature and components is effectively improved, the utilization rate of oxygen is improved, and oxygen consumption per ton of steel is reduced, wherein statistical data show that under the same conditions, the oxygen consumption per ton of steel is reduced to 48.50m3/t from 51.08m3/t (average value) before optimization, and is reduced by 2.58m 3/t.
Example 1, the following:
the dynamic control method of the bottom blowing instantaneous flow of the top-bottom combined blown converter based on the invention is a schematic diagram of the dynamic control curve of the instantaneous flow of a certain heat (nitrogen-argon switching).
The smelting steel grade of the heat is as follows: Q345B; furnace age 8236 furnace, last furnace blowing terminal [ C ] content: 0.079 wt%, content of [ O ]: 0.0360 wt%, the liquid level of a molten pool is 920cm, and the temperature T is 1646 ℃; at point B, the nitrogen gas was automatically switched to argon.
In fig. 1, point a: the time node from the earlier stage of converter blowing to the middle stage of converter blowing is the time point when the theoretical value of total oxygen consumption is 30%;
and B, point: the switching time of bottom blowing gas types of nitrogen and argon is automatically calculated and switched by the model;
and C, point: a converting end time node;
and D, point: tapping start time node;
e, point: tapping ending time node;
and F point: a time node for starting slag splashing protection;
and point G: and (5) time node of the slag splashing furnace protection ending.
Example 2
Fig. 2 is a schematic view of an instantaneous flow dynamic control curve (argon gas blowing in the whole process) of a bottom-blowing instantaneous flow dynamic control method of a top-bottom combined blown converter based on data fitting in a certain heat cycle, according to an embodiment of the present invention.
Description of the drawings: the smelting steel grade of the heat is as follows: Q460C; furnace age 10126 furnace, last furnace blowing terminal [ C ] content: 0.075 wt%, [ O ] content: 0.0382 wt%, liquid level of molten pool 912cm, and temperature T1650 ℃; argon is blown in the whole process.
In fig. 2, point a: the time node from the earlier stage of converter blowing to the middle stage of converter blowing is the time point when the theoretical value of total oxygen consumption is 30%;
and B, point: the switching time of bottom blowing gas types of nitrogen and argon is determined, and the model is automatically calculated and switched (argon is blown in the whole process of the steel type of the furnace, and switching is not needed);
and C, point: time node of blowing ending (post-stirring starting);
and D, point: tapping start (after stirring) time node;
e, point: tapping ending time node;
and F point: a time node for starting slag splashing protection;
and point G: and (5) time node of the slag splashing furnace protection ending.
The graphs of the above embodiments can be displayed by using a display screen. The method for dynamically controlling instantaneous flow rate of bottom blowing of a top-bottom combined blown converter is implemented by combining the units and algorithm steps of each example described in the embodiments disclosed herein, and can be implemented by electronic hardware, computer software, or a combination of the two. Whether such functionality is implemented as hardware or software depends upon the particular application and design constraints imposed on the implementation. Skilled artisans may implement the described functionality in varying ways for each particular application, but such implementation decisions should not be interpreted as causing a departure from the scope of the present invention.
The method for dynamically controlling the instantaneous flow of bottom-blowing in a top-bottom combined blown converter may be implemented in any combination of one or more programming languages, including an object oriented programming language such as Java, C + + or the like and conventional procedural programming languages, such as the "C" programming language or similar programming languages. The program code may execute entirely on the user's computing device, partly on the user's device, as a stand-alone software package, partly on the user's computing device and partly on a remote computing device, or entirely on the remote computing device or server. In the case of a remote computing device, the remote computing device may be connected to the user computing device through any kind of network, including a Local Area Network (LAN) or a Wide Area Network (WAN), or may be connected to an external computing device (e.g., through the internet using an internet service provider).
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (6)
1. A bottom blowing instantaneous flow dynamic control method of a top-bottom combined blown converter is characterized by comprising the following steps:
acquiring bottom blowing flow historical data of each time point of the converter with preset duration;
measuring the liquid level, the carbon content, the oxygen content and the temperature of a molten pool at each time point of the converter with preset time length by using a converter sublance, calling the service life parameter data of the converter, and calculating the average value;
acquiring instantaneous bottom blowing flow of the converter at each time point of the converter with preset time length, namely the corresponding instantaneous flow F (t) at any time on a time axis in converter blowing preparation, blowing, tapping, slag splashing protection, empty furnace and maintenance states;
F(t)＝F0+(A-A0)×η0+(M/M0-1)×0.0025×η1-B×η2+T×η3
wherein the content of the first and second substances,
F0: a data fitting value of the bottom blowing flow historical data at a certain moment; unit: m is3/h；
A: the liquid level of a molten pool measured by a sublance at the last converting end point; unit: cm;
A0: theoretical liquid level of the molten pool; unit: cm;
η0: a molten pool liquid level correction coefficient which is a molten pool liquid level correction value based on a preset number of tapping historical data;
m ═ C ] x [ O ], which is the contents of [ C ] and [ O ] measured by the last converting end sublance, namely carbon-oxygen product;
[C] the unit of (A) is%, [ O ] is ppm;
M0: data fitting values of furnace carbon oxygen product historical data;
η1: carbon-oxygen product correction values based on a preset number of tapping historical data;
b: the converter life of the blowing heat;
η2: a converter life correction value based on a preset number of tapping historical data;
t is the temperature of a molten pool measured by a sublance at the last converting end point;
η3: and the temperature correction value of the molten pool is based on the preset amount of tapping historical data.
2. The method for dynamically controlling the instantaneous flow rate of bottom blowing in a top-bottom combined blown converter according to claim 1,
and (3) presetting the bottom blowing flow historical data of each time point of the converter for a preset time length, and performing data fitting on the bottom blowing flow historical data.
3. The method for dynamically controlling the instantaneous flow rate of bottom blowing in a top-bottom combined blown converter according to claim 2,
performing data fitting on the bottom blowing flow historical data through a flow curve fitting function provided by an MATLAB module;
the data fitting value calculation mode is as follows:
F0＝polyval(a,t),a＝polyfit(tdata,Fdata,n)；
n represents the highest order of the polynomial, tdata and Fdata are data to be fitted and are input in an array mode.
4. The method for dynamically controlling the instantaneous flow rate of bottom blowing in a top-bottom combined blown converter according to claim 1 or 2,
the furnace number of the preset number of furnace discharge historical data is 50 to 60.
5. The method for dynamically controlling the instantaneous flow rate of bottom blowing in a top-bottom combined blown converter according to claim 1 or 2,
values when the sublance measurement fails are: t is 1650 deg.C, A is A0，M＝[C]×[O]＝0.0025。
6. The method for dynamically controlling the instantaneous flow rate of bottom blowing in a top-bottom combined blown converter according to claim 1 or 2,
when the furnace age is 8000 to 8500 furnaces, under the conditions that the curve end point w ([ C ]) is 0.07 wt% and the temperature is 1640 ℃, the average carbon-oxygen product value is reduced from 0.00266 to 0.00253, the average carbon-oxygen product value is reduced by 0.00013, and the optimized value is more stable.
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