CN114574660A - KR intelligent control method based on-demand desulfurization - Google Patents
KR intelligent control method based on-demand desulfurization Download PDFInfo
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- CN114574660A CN114574660A CN202210155967.1A CN202210155967A CN114574660A CN 114574660 A CN114574660 A CN 114574660A CN 202210155967 A CN202210155967 A CN 202210155967A CN 114574660 A CN114574660 A CN 114574660A
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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
- C21C7/04—Removing impurities by adding a treating agent
- C21C7/064—Dephosphorising; Desulfurising
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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
- C21C1/00—Refining of pig-iron; Cast iron
- C21C1/02—Dephosphorising or desulfurising
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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
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Abstract
The invention relates to the technical field of KR molten iron pretreatment, in particular to a KR intelligent control method based on-demand desulfurization. The KR intelligent control method comprises the steps that a secondary model control system is arranged between a primary control system and an MES system, the secondary model control system judges the desulfurization level, and the primary control system carries out feeding operation according to the desulfurization level, wherein the desulfurization level comprises deep desulfurization, medium desulfurization, shallow desulfurization and non-desulfurization, the deep desulfurization requires 6-7kg of the feeding amount of a desulfurizer per ton iron, the medium desulfurization requires 4-5kg of the feeding amount of the desulfurizer per ton iron, the shallow desulfurization requires 2-3kg of the feeding amount of the desulfurizer per ton iron, and the non-desulfurization is not fed with the desulfurizer; and the slag skimming is divided into three levels according to the molten iron desulphurization grade. The invention carries out the design of desulphurization according to needs on the basis of the planned execution of steel grade process path, the planned execution of steel grade composition requirement, the original composition of molten iron and the like, and provides effective support for effectively reducing the comprehensive cost of KR molten iron pretreatment and improving the charging condition of the molten iron in the converter.
Description
Technical Field
The invention relates to the technical field of KR molten iron pretreatment, in particular to a KR intelligent control method based on-demand desulfurization.
Background
At present, the molten iron pretreatment process is relatively blind, the KR molten iron pretreatment intelligent system solution is missing, the randomness in the operation process is strong, and molten iron composition control in the converter and the KR treatment process molten iron loss and the like are greatly influenced, so that the problems of high molten iron loss, unstable converter molten iron composition (S), low intelligent level and the like generally exist in the KR molten iron pretreatment process. KR molten iron pretreatment process not only relates to the metallurgical physical-chemical reaction of molten iron desulfurization process, also has mechanical operation such as stirring, the slagging-off of high temperature liquid metal simultaneously, and KR molten iron pretreatment process not only concerns the control of stove molten iron composition quality, more need consider comprehensive cost such as molten iron loss, desulfurizer unit consumption.
The Chinese patent application CN202010837149.0 provides a quantitative characterization method for KR stirring mixing characteristics of molten iron and an intelligent desulfurization method, and realizes the accurate measurement of the height of a molten iron slag surface and the height of the molten iron liquid surface and the accurate calculation of slag skimming amount by the installation and distance measurement of a molten iron slag skimming position laser level meter; the method has the advantages that the installation of the high-definition video camera of the molten iron desulphurization position and the application of the image recognition software ensure the rapid recognition and acquisition of the video image quality and the characterization accurate parameters, and the aim of accurately, rapidly and intelligently controlling the stirring rotating speed is fulfilled according to the regulation rate of 5-10 r/min based on the difference of the established control range requirements of the characterization parameters of the desulfurizer adding stage and the stirring desulphurization stage. The method aims at providing a general demonstration for the identification of the insertion depth of the stirrer and the desulfurization characterization in the molten iron slagging-off process, and a control model combined with actual production is not formed.
The Chinese patent application CN202010233904.4 provides a step-by-step stirring desulfurization method for molten iron KR, which comprises the following steps: firstly, slagging off molten iron, measuring the liquid level depth, measuring the temperature and sampling; step two, inserting the stirrer into the shallow layer of the molten iron liquid level, and rotating to the working rotating speed; step three, keeping the stirring depth and the rotating speed, and adding a desulfurizing agent; fourthly, adjusting the insertion depth and the working rotating speed of the stirrer; and step five, stirring until the desulfurization is finished, and slagging off, measuring the temperature and sampling again. The method does not combine with specific process requirements for grading arrangement, and is only explained from two aspects of stirring and feeding.
Disclosure of Invention
Aiming at the technical problems that the molten iron pretreatment process in the prior art is relatively blind and the randomness of the operation process is high, the invention provides the KR intelligent control method based on-demand desulfurization, wherein a secondary model control system is arranged between a primary control system and an MES system, and the on-demand desulfurization design is carried out according to the planning of steel process path execution, the planning of steel component execution requirements, the original molten iron components and the like, so that the KR molten iron pretreatment comprehensive cost is effectively reduced, and the molten iron charging condition of a converter is improved.
The technical scheme of the invention is as follows:
a KR intelligent control method based on desulfurization on demand is characterized in that a secondary model control system is arranged between a primary control system and an MES system, the secondary model control system judges the desulfurization level, and the primary control system carries out feeding operation according to the desulfurization level, wherein the desulfurization level comprises deep desulfurization, medium desulfurization, shallow desulfurization and non-desulfurization, the deep desulfurization requires 6-7kg of the feeding amount of a desulfurizer per ton of iron, the medium desulfurization requires 4-5kg of the feeding amount of the desulfurizer per ton of iron, the shallow desulfurization requires 2-3kg of the feeding amount of the desulfurizer per ton of iron, and the non-desulfurization does not feed a desulfurizer;
the secondary model control system also judges the slagging-off grade according to the desulfurization grade, and the primary control system carries out slagging-off operation according to the slagging-off grade, wherein the slagging-off grade comprises a primary grade, a secondary grade and a tertiary grade, the deep desulfurization steel grade carries out slagging-off according to the primary requirement, the medium desulfurization steel grade carries out slagging-off according to the secondary requirement, and the shallow desulfurization and non-desulfurization steel grade carries out slagging-off according to the tertiary requirement;
the first grade requires that the front slag skimming is exposed above the molten iron surface 3/5, the rear slag skimming is exposed above the molten iron surface 4/5,
the second grade requires that the front slag skimming is exposed above the molten iron surface 1/2, the rear slag skimming is exposed above the molten iron surface 2/3,
and the third level requires that the front slag skimmer is exposed above the molten iron surface 1/4, and the rear slag skimmer is exposed above the molten iron surface 1/4.
Further, the secondary model control system judges the desulfurization level according to the components of the planned execution steel grade obtained by the MES system, the components of the current heat molten iron and the subsequent process route of the current heat molten iron.
Further, the method for judging the desulfurization degree is as follows:
(1) judging whether the planned execution steel grade is subjected to RH/VD treatment, if so, the desulfurization grade is deep desulfurization;
if not, performing the step (2);
(2) judging whether the planned execution steel grade is a CAS direct feeding steel grade or not, if so, determining the desulfurization grade according to the molten iron (S) entering the furnace,
the [ S ] of molten iron entering the furnace is less than or equal to 0.035 percent, and the desulfurization grade is no desulfurization;
the molten iron (S) entering the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, performing the step (3);
(3) judging whether the maximum value of the steel grade (S) which is planned to be executed is greater than 0.015 percent, if so, determining the desulfurization grade according to the molten iron (S) which is put into the furnace,
the [ S ] of the molten iron entering the furnace is less than or equal to 0.035%, and the desulfurization grade is no desulfurization;
the molten iron (S) entering the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, the maximum value of the steel grade (S) is executed according to the plan to determine the desulfurization grade,
the maximum value of the planned execution steel grade (S) is less than or equal to 0.0010 percent, and the desulfurization grade is deep desulfurization;
0.0010% < plan execution steel grade [ S ] maximum value is less than or equal to 0.0020%, and the desulfurization grade is medium desulfurization;
0.0020% < maximum value of steel grade [ S ] planned to be executed is less than or equal to 0.0025%, and the desulfurization grade is shallow desulfurization;
0.0025% < maximum value of steel grade [ S ] planned to be performed is less than or equal to 0.015%, and the desulfurization grade is no desulfurization.
And further, according to the desulfurization grade, the secondary model control system outputs a feeding instruction and a stirring instruction, and transmits the feeding instruction and the stirring instruction to the primary control system for operation.
Further, the feeding instruction comprises the feeding amount of the desulfurizer, the feeding time and the extension or removal of a blanking pipe; the stirring instruction comprises the insertion depth of the stirring head, the stirring time and the stirring rotating speed.
Further, infrared imaging is utilized to monitor and analyze the liquid level of the ladle in real time, graph recognition is carried out on the liquid level of the ladle, and whether slagging-off meets the requirements or not is judged.
And further, according to the slag skimming grade, the secondary model control system outputs a slag skimming instruction and transmits the slag skimming instruction to the primary control system for operation.
Further, the feeding instruction comprises different steel type slag-raking types, telescopic swing amplitude control of the slag-raking arm after image recognition and ladle tilting angle.
The invention has the beneficial effects that:
the KR intelligent control method provided by the invention is used for carrying out graded desulfurization and slagging-off setting on a planned execution steel grade process path, a planned execution steel grade component requirement, a molten iron original component and the like, realizing KR molten iron pretreatment intelligent treatment as required, providing standardized operation guidance and an intelligent manufacturing system solution for reducing molten iron loss and improving KR treatment efficiency, and realizing overall consideration of cost, efficiency and quality.
Drawings
In order to more clearly illustrate the embodiments or technical solutions in the prior art of the present invention, the drawings used in the description of the embodiments or prior art will be briefly described below, 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 schematic diagram showing the structure of a KR molten iron pretreatment production system according to example 1 of the present invention.
Detailed Description
In order to make those skilled in the art better understand the technical solution of the present invention, the technical solution in the embodiment of the present invention will be clearly and completely described below with reference to the drawings in the embodiment of the present invention, and it is obvious that the described embodiment is only a part of the embodiment of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without making any creative effort based on the embodiments in the present invention, shall fall within the protection scope of the present invention.
Example 1
A KR intelligent control method based on-demand desulfurization is characterized in that a secondary model control system is arranged between a primary control system and an MES system, and the secondary model control system judges the desulfurization level and the slagging-off level according to the components of a plan execution steel grade obtained by the MES system, the components of molten iron of the current heat and the subsequent process route of the molten iron of the current heat, wherein the method for judging the desulfurization level comprises the following steps:
(1) judging whether the planned execution steel grade is subjected to RH/VD treatment, if so, the desulfurization grade is deep desulfurization;
if not, performing the step (2);
(2) judging whether the planned execution steel grade is a CAS direct steel grade or not, if so, determining the desulfurization grade according to the molten iron (S) entering the furnace,
the [ S ] of the molten iron entering the furnace is less than or equal to 0.035%, and the desulfurization grade is no desulfurization;
the molten iron (S) entering the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, performing the step (3);
(3) judging whether the maximum value of the steel grade (S) which is planned to be executed is greater than 0.015 percent, if so, determining the desulfurization grade according to the molten iron (S) which is put into the furnace,
the [ S ] of the molten iron entering the furnace is less than or equal to 0.035%, and the desulfurization grade is no desulfurization;
the molten iron (S) in the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, the maximum value of the steel grade (S) is executed according to the plan to determine the desulfurization grade,
the maximum value of the planned execution steel grade (S) is less than or equal to 0.0010 percent, and the desulfurization grade is deep desulfurization;
0.0010% < plan execution steel grade [ S ] maximum value is less than or equal to 0.0020%, and the desulfurization grade is medium desulfurization;
0.0020% < maximum value of steel grade [ S ] planned to be executed is less than or equal to 0.0025%, and the desulfurization grade is shallow desulfurization;
0.0025% < maximum value of steel grade [ S ] planned to be performed is less than or equal to 0.015%, and the desulfurization grade is no desulfurization.
The specific steel grades are compared with the desulfurization grade as shown in the following table 1.
TABLE 1 comparison table of concrete steel grades and desulfurization grades
The method for judging the slag skimming grade comprises the following steps:
the deep desulfurization steel grade is subjected to slagging-off according to the first-level requirement, the medium desulfurization steel grade is subjected to slagging-off according to the second-level requirement, and the shallow desulfurization and non-desulfurization steel grade is subjected to slagging-off according to the third-level requirement.
And then the secondary model control system outputs a desulfurization feeding instruction (such as the feeding amount of a desulfurizing agent, the feeding time, the extension or the removal of a blanking pipe), a desulfurization stirring instruction (such as the insertion depth of a stirring head, the stirring time, the stirring speed and the like) and a slagging instruction (such as the telescopic swing amplitude control of a slagging arm, the tilting angle of a ladle and the like) to the primary control system, the primary control system carries out desulfurization and slagging operation according to the instruction, carries out real-time monitoring and analysis on the liquid level of the ladle by utilizing infrared imaging, carries out pattern recognition on the liquid level of the ladle, and judges whether slagging meets the requirement or not. The desulfurization grade and the corresponding desulfurization scheme are shown in the following table 2, and the slagging grade and the corresponding slagging requirement are shown in the following table 3.
TABLE 2 desulfurization grade and corresponding desulfurization protocol
| Grade of desulfurization | Ton iron feeding amount |
| Deep desulfurization | 6-7kg |
| Middle desulfurization | 4-5kg |
| Shallow desulfurization | 2-3kg |
| Without desulfurization | Without feeding |
TABLE 3 slagging-off grade and corresponding slagging-off requirement
Although the present invention has been described in detail by referring to the drawings in connection with the preferred embodiments, the present invention is not limited thereto. Various equivalent modifications or substitutions can be made on the embodiments of the present invention by those skilled in the art without departing from the spirit and scope of the present invention, and these modifications or substitutions are within the scope of the present invention/any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention.
Claims (8)
1. The KR intelligent control method based on-demand desulfurization is characterized in that a secondary model control system is arranged between a primary control system and an MES system, the secondary model control system judges the desulfurization level, and the primary control system carries out feeding operation according to the desulfurization level, wherein the desulfurization level comprises deep desulfurization, medium desulfurization, shallow desulfurization and non-desulfurization, the deep desulfurization requires 6-7kg of the feeding amount of a desulfurizer per ton of iron, the medium desulfurization requires 4-5kg of the feeding amount of the desulfurizer per ton of iron, the shallow desulfurization requires 2-3kg of the feeding amount of the desulfurizer per ton of iron, and the non-desulfurization is not fed with a desulfurizer;
the secondary model control system also judges the slagging-off grade according to the desulfurization grade, the primary control system carries out slagging-off operation according to the slagging-off grade, wherein the slagging-off grade comprises a primary grade, a secondary grade and a tertiary grade, deep desulfurization steel grade carries out slagging-off according to the primary requirement, medium desulfurization steel grade carries out slagging-off according to the secondary requirement, and shallow desulfurization and non-desulfurization steel grade carries out slagging-off according to the tertiary requirement;
the first grade requires that the front slag skimming is exposed above the molten iron surface 3/5, the rear slag skimming is exposed above the molten iron surface 4/5,
the second grade requires that the front slag skimming is exposed above the molten iron surface 1/2, the rear slag skimming is exposed above the molten iron surface 2/3,
and the third level requires that the front slag skimmer is exposed above the molten iron surface 1/4, and the rear slag skimmer is exposed above the molten iron surface 1/4.
2. The KR intelligent control method of claim 1, wherein the secondary model control system determines the desulfurization level according to the composition of the planned execution steel grade, the composition of the current heat molten iron and the subsequent process route of the current heat molten iron obtained by the MES system.
3. The KR intelligent control method as set forth in claim 1, wherein the desulfurization grade is judged by the following method:
(1) judging whether the planned execution steel grade is subjected to RH/VD treatment, if so, the desulfurization grade is deep desulfurization;
if not, performing the step (2);
(2) judging whether the planned execution steel grade is a CAS direct steel grade or not, if so, determining the desulfurization grade according to the molten iron (S) entering the furnace,
the [ S ] of the molten iron entering the furnace is less than or equal to 0.035%, and the desulfurization grade is no desulfurization;
the molten iron (S) entering the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, performing the step (3);
(3) judging whether the maximum value of the steel grade (S) which is planned to be executed is greater than 0.015 percent, if so, determining the desulfurization grade according to the molten iron (S) which is put into the furnace,
the [ S ] of the molten iron entering the furnace is less than or equal to 0.035%, and the desulfurization grade is no desulfurization;
the molten iron (S) entering the furnace is more than 0.035%, and the desulfurization grade is shallow desulfurization;
if not, the maximum value of the steel grade (S) is executed according to the plan to determine the desulfurization grade,
the maximum value of the planned execution steel grade (S) is less than or equal to 0.0010 percent, and the desulfurization grade is deep desulfurization;
0.0010% < plan execution steel grade [ S ] maximum value is less than or equal to 0.0020%, and the desulfurization grade is medium desulfurization;
0.0020% < maximum value of planned execution steel grade (S) < 0.0025%, and desulfurization grade is shallow desulfurization;
0.0025% < maximum value of steel grade [ S ] planned to be performed is less than or equal to 0.015%, and the desulfurization grade is no desulfurization.
4. The KR intelligent control method as claimed in claim 1, wherein the secondary model control system outputs a feeding instruction and a stirring instruction according to the desulfurization grade, and transmits the feeding instruction and the stirring instruction to the primary control system for operation.
5. The KR intelligent control method as claimed in claim 4, wherein the feeding instruction comprises feeding amount of desulfurizer, feeding time, and insertion or removal of blanking pipe; the stirring instruction comprises the insertion depth of the stirring head, the stirring time and the stirring rotating speed.
6. The KR intelligent control method as claimed in claim 1, wherein infrared imaging is used to monitor and analyze the ladle liquid level in real time, and the ladle liquid level is graphically identified to determine whether slagging off is satisfactory or not.
7. The KR intelligent control method of claim 1, wherein the secondary model control system outputs slag-raking instructions according to the slag-raking grade and transmits the slag-raking instructions to the primary control system for operation.
8. The KR intelligent control method according to claim 7, wherein the feeding instructions include slag-raking types of different steel grades, telescopic swing amplitude control of a slag-raking arm after image recognition, and ladle tilting angle.
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115261543A (en) * | 2022-07-21 | 2022-11-01 | 中冶南方工程技术有限公司 | Automatic control method for molten iron pretreatment |
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| CN113817894A (en) * | 2020-06-21 | 2021-12-21 | 宝山钢铁股份有限公司 | Online cleaning method for sticky slag of KR desulfurization stirrer of molten iron |
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| JP2000109924A (en) * | 1998-10-06 | 2000-04-18 | Sumitomo Metal Ind Ltd | Method for melting extra-low sulfur steel |
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| CN115261543A (en) * | 2022-07-21 | 2022-11-01 | 中冶南方工程技术有限公司 | Automatic control method for molten iron pretreatment |
| CN115261543B (en) * | 2022-07-21 | 2023-08-25 | 中冶南方工程技术有限公司 | Automatic control method for molten iron pretreatment |
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