CN110714109A - Method for controlling smoke emission of converter scrap steel - Google Patents
Method for controlling smoke emission of converter scrap steel Download PDFInfo
- Publication number
- CN110714109A CN110714109A CN201910987170.6A CN201910987170A CN110714109A CN 110714109 A CN110714109 A CN 110714109A CN 201910987170 A CN201910987170 A CN 201910987170A CN 110714109 A CN110714109 A CN 110714109A
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- scrap
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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
-
- 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
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- Engineering & Computer Science (AREA)
- Chemical & Material Sciences (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
- Manufacture And Refinement Of Metals (AREA)
Abstract
The embodiment of the invention provides a method for controlling converter scrap steel to enter a converter to smoke, which comprises the following steps: dividing a steel scrap pool area according to the type grade of the steel scrap, wherein the steel scrap pool area comprises a type of steel scrap, common steel scrap and a low-grade packaging block steel scrap area, and counting the weight of the steel scrap in the steel scrap pool area; according to the weight of the scrap steel, the scrap steel is produced according to the technical requirements of matching the scrap steel charging buckets fed into the furnace with different grades of scrap steel; through the refined management of the waste steel raw materials, the invention realizes the promotion of the powerful and smooth production of the converter, provides favorable conditions for the low iron consumption production, yield increase and efficiency creation of the converter, prolongs the service life of equipment such as a travelling crane girder and a dust removal smoke hood, reduces the equipment burning loss and equipment hidden danger, reduces the equipment maintenance time, improves the operation efficiency of the converter, solves the problem that the converter waste steel smokes when entering the converter, promotes the energy conservation and emission reduction of the converter, obviously increases the total use amount of the converter waste steel, and effectively promotes the comprehensive utilization of solid waste resources.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, relates to a method for controlling smoke of converter scrap steel entering a converter, and particularly relates to a method design for controlling smoke of the scrap steel in a molten iron adding process in converter smelting production.
Background
The scrap steel is one of main raw materials for smelting and producing in the converter, and along with the promotion of structural reform of the supply side, particularly, the 'bar steel' is completely banned, the resource amount of the scrap steel is greatly increased, the price advantage of the scrap steel is remarkable, and the improvement of the scrap steel ratio is beneficial to yield increase and efficiency creation and promotion of green development of the steel industry.
At present, in the converter production in the prior art, high scrap ratio organization production is adopted, the loading amount of single-furnace scrap is greatly increased, after the converter improves the scrap ratio, because the quality of social scrap is unstable, the difference of different grades and qualities is huge, and part of scrap contains combustible substances such as oil stain, plastics, rubber and the like, and impurities in the scrap steel in the molten iron adding process are violently combusted to emit black smoke, so that the efficiency performance and the smooth production of the converter are greatly limited, and the environmental protection pressure is greatly increased, therefore, when the converter produces at the high scrap ratio, a method for controlling the smoke emission of the scrap steel in the molten iron adding process of the converter is urgently needed, the problem of the smoke emission of the scrap steel in the production process after the converter improves the scrap ratio is solved, and the production requirements of high efficiency and environmental protection are met.
Disclosure of Invention
The embodiment of the invention provides a method for controlling smoke emission of converter scrap steel when the converter scrap steel is fed into a converter, and aims to solve the problem that impurities in the scrap steel are violently combusted to emit black smoke in the process of molten iron mixing in the conventional converter high scrap steel ratio mode production.
In order to achieve the above object, an embodiment of the present invention provides a method for controlling smoke generated by feeding converter steel scrap into a converter, where the method includes:
a method of controlling converter scrap smoking, the method comprising:
dividing a steel scrap pool area according to the type grade of the steel scrap, wherein the steel scrap pool area comprises a type of steel scrap, common steel scrap and a low-grade packaging block steel scrap area, and counting the weight of the steel scrap in the steel scrap pool area;
according to the weight of the scrap steel, the scrap steel is produced according to the technical requirements of the charging bucket proportioning of the scrap steel charged into the furnace in different grades.
Preferably, the method further comprises: and (3) establishing a process for adding molten iron in the converter, controlling the molten iron adding speed according to the height of the combustion flame of the converter, and controlling the molten iron adding time to be more than 3 minutes.
Preferably, the type of steel scraps, common steel scraps and low-grade bale scrap specifically includes: the first kind of scrap steel is: the interior of the steel scrap does not contain inflammable matters and impurities; the common steel scrap comprises: scrap containing combustible substances of oil stain, rubber and plastics, wherein the weight of the combustible substances does not exceed 0.5 percent of the total weight of the common scrap; the low-grade packaging block scrap steel is as follows: scrap containing combustible materials of oil, rubber, plastic and paint, the weight of said combustible materials exceeding 0.5% of the total weight of the scrap of the low grade bale.
Preferably, the production according to the steel scrap weight and the steel scrap charging bucket proportioning technical requirements of different grades of steel scrap entering the furnace specifically comprises: in each furnace production, the weight of the one type of scrap steel is more than 50% of the total amount of the scrap steel in the furnace, the weight of the common scrap steel is 30 +/-2% of the total amount of the scrap steel in the furnace, the weight of the low-grade packaging block scrap steel is less than 20% of the total amount of the scrap steel in the furnace, and the sum of the weight of the common scrap steel and the weight of the low-grade packaging block scrap steel is less than 50% of the total amount of the scrap steel in the furnace.
Preferably, a 150t converter is used, the total charging amount of the molten iron and the scrap steel is 158t, the total weight of the scrap steel is 28t, if the weight of the scrap steel of the low-grade packaging blocks exceeds 10t, the combustion is violent in the molten iron mixing process and a large amount of black smoke is generated, and the smooth production is limited; and then controlling the charging amount of the low-grade packed scrap steel blocks to be below 5t, wherein the proportion of the packed scrap steel blocks to the total amount of the scrap steel is lower than 20%, and realizing the smoke generation control of molten iron charging by matching with an improved molten iron charging operation mode.
Preferably, the molten iron charging process of the converter specifically comprises the following steps: in each furnace production, charging is carried out according to the sequence of adding molten iron after scrap steel is advanced, and the operating speed of a dust removal fan of the converter is controlled to be more than 1700 r/min.
Preferably, the scrap steel includes: processing the punched sheet bulk material and the cold-pressed block by an automobile cold-rolled sheet machine; cold-pressed blocks produced entirely from the materials of the ship and the plant.
Preferably, the general scrap specifically includes: the material is disassembled to train wheel, axle, bogie, heavy rail and train, or large rail beam steel structure, or the material is even, the material type is clear in one color bar section steel, steel plate and gear machine parts, or ship body, factory building, automobile disassembly scrap steel.
Preferably, the low-grade bale scrap specifically comprises: the external part of various domestic scrap steels is packed by cold-rolled stamping sheets, and the internal part of the various domestic scrap steels is scrap iron.
The technical scheme has the following beneficial effects: through the refined management of the waste steel raw materials, the invention realizes the promotion of the powerful and smooth production of the converter, provides favorable conditions for the low iron consumption production, yield increase and efficiency creation of the converter, prolongs the service life of equipment such as a travelling crane girder and a dust removal smoke hood, reduces the equipment burning loss and equipment hidden danger, reduces the equipment maintenance time, improves the operation efficiency of the converter, solves the problem that the converter waste steel smokes when entering the converter, promotes the energy conservation and emission reduction of the converter, obviously increases the total use amount of the converter waste steel, and effectively promotes the comprehensive utilization of solid waste resources.
Detailed Description
The technical solutions in the present invention are clearly and completely described below, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all 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 invention discloses a method for controlling converter scrap steel to enter a converter to smoke, which comprises the following steps:
dividing a steel scrap pool area according to the type grade of the steel scrap, wherein the steel scrap pool area comprises a type of steel scrap, common steel scrap and a low-grade packaging block steel scrap area, and counting the weight of the steel scrap in the steel scrap pool area; and fine management of scrap steel delivery and stacking is realized.
According to the weight of the steel scrap, a steel scrap factory can master the weight ratio data of all grades of material types of the converter steel scrap pool in real time, and make all grades of steel scrap distribution plans in a classified manner, so that the orderly production of the converter is ensured; the production is carried out according to the technical requirements of matching the scrap steel charging buckets charged into the furnaces with the scrap steel of different grades, and the charging proportion of the single-furnace low-grade scrap steel (the number of combustible substances in a packing block is large) is strictly controlled so as to avoid the scrap steel with poor quality from being intensively charged into the furnace.
Preferably, the method further comprises: the molten iron charging process of the converter is formulated, the molten iron charging speed is controlled according to the height of the combustion flame of the converter, the molten iron charging time is controlled to be more than 3 minutes, and the processing capacity of the dust removal system can be fully exerted.
Preferably, the type of steel scraps, common steel scraps and low-grade bale scrap specifically includes:
the first kind of scrap steel is: processing the punched sheet bulk material and the cold-pressed block by an automobile cold-rolled sheet machine; the cold pressing block is produced by ship dismantling materials (a hull plate, a hull plate and a ship frame) and plant dismantling materials (deformed steel bars, wires, steel structural members, steel tiles and the like except for encaustic tiles). One type of scrap steel contains no or very little inflammable substances and impurities inside.
The common steel scrap comprises: dismantling materials of train wheels, axles, bogies, heavy rails and trains; large rail beam steel structure; mechanical parts such as bar-shaped steel, steel plates, gears and the like which are uniform in material quality and clear in color; the waste steel (bar steel, steel plate and high-quality casting, building template, steel structural member, mechanical part, etc.) for ship body, factory building and automobile is dismantled. The amount of oil stain, rubber, plastics and other inflammable matters and other impurities in the common steel scrap does not exceed 0.5 percent of the total weight.
The low-grade packaging block scrap steel is as follows: various domestic scrap steel and the like (containing burnt iron and pop can bulk materials); the outside is packed by cold rolling punching press piece and inside is whole to be iron fillings. The amount of oil stain, rubber, inflammable substances such as plastics and paint and other impurities in the low-grade packaging block scrap steel is more than 0.5 percent of the total weight.
Preferably, the production according to the steel scrap weight and the steel scrap charging bucket proportioning technical requirements of different grades of steel scrap entering the furnace specifically comprises: in each furnace production, the weight of the first-class scrap is more than 50 percent of the total amount of the scrap steel in the furnace, the weight of the common scrap steel is 30 +/-2 percent of the total amount of the scrap steel in the furnace, the weight of the low-grade packaging block scrap steel is less than 20 percent of the total amount of the scrap steel in the furnace, and the sum of the weight of the common scrap steel and the weight of the low-grade packaging block scrap steel is less than 50 percent of the total amount of the scrap steel in the furnace, so the problem of smoke generated when the converter scrap steel enters the furnace can be effectively controlled.
Preferably, a 150t converter is used, the total charging amount of the molten iron and the scrap steel is 158t, the total weight of the scrap steel is 28t, if the weight of the scrap steel of the low-grade packaging blocks exceeds 10t, the combustion is violent in the molten iron mixing process, a large amount of black smoke is generated, and the smooth production is limited; if the charging amount of the low-grade packed scrap blocks is controlled to be less than 5t, the proportion of the packed scrap blocks to the total amount of the scrap steel is less than 20 percent, and the smoke generation control of molten iron charging can be realized by matching with an improved molten iron charging operation mode.
Preferably, the molten iron charging process of the converter specifically comprises the following steps: in each furnace production, charging is carried out according to the sequence of adding molten iron after scrap steel is advanced, and the operating speed of a dust removal fan of the converter is controlled to be more than 1700 r/min.
One specific embodiment of the present invention is as follows:
through developing a scrap information transmission system, a converter scrap pool is transformed in a partition mode according to the type grade of the scrap, and fine management of delivery and stacking of the scrap is realized; by means of a scrap information transmission system, a scrap plant masters the weight ratio data of all levels of material types of a converter scrap pool in real time, and prepares a scrap distribution plan of all levels in a classified manner; the converter factory is managed according to the stacking of the incoming scrap steel according to the region, strictly executes the technical requirements of matching the scrap steel of different grades with the charging hopper, and strictly controls the charging proportion of the single-furnace low-grade scrap steel (the packing block has more combustible substances) so as to avoid the concentrated charging of the poor-quality scrap steel; the technological requirements of the molten iron charging of the converter are formulated, the molten iron charging speed is controlled according to the height of the combustion flame of the converter, the molten iron charging time is controlled to be more than 3 minutes, and the processing capacity of a dust removal system is fully exerted; therefore, the control of the combustion and smoking of the scrap steel impurities in the molten iron mixing process in the high scrap steel ratio mode production can be realized.
Based on the above principle, the specific steps of this embodiment include:
dividing the waste steel pool area according to the type grade of the waste steel material and the consumption of the waste steel of each grade when purchasing, and stacking the waste steel pool area according to three grades of one-grade waste steel, common waste steel and low-grade packed waste steel (the interior of the waste steel is rich in combustible impurities), thereby realizing the regionalization and the fine management of the waste steel pool of the converter.
And a scrap steel information transmission system is developed, the scrap steel data information of each material type area of the converter scrap steel pool is transmitted in real time, and the material type grade and the weight ratio of the scrap steel for the converter are accurately controlled.
By utilizing the scrap information transmission system, a scrap plant masters the weight ratio data of each grade material type of the converter scrap pool in real time, and makes a plan for implementing scrap distribution according to the technical requirements of each grade of scrap distribution, so as to ensure the weight of each grade of scrap in the converter scrap pool.
According to the technical requirements of the charging and proportioning of the scrap steel charged into the furnace in different grades, the method specifically comprises the following steps: in each furnace production, the weight of the one type of scrap steel is more than 50% of the total amount of the scrap steel in the furnace, the weight of the common scrap steel is 30 +/-2% of the total amount of the scrap steel in the furnace, the weight of the low-grade packaging block scrap steel is less than 20% of the total amount of the scrap steel in the furnace, and the sum of the weight of the common scrap steel and the weight of the low-grade packaging block scrap steel is less than 50% of the total amount of the scrap steel in the furnace.
The converter raw materials are loaded according to the sequence of adding molten iron after scrap steel, the molten iron adding process is stable and slow, and the operating speed of a dust removal fan is controlled to be more than 1700 r/min.
Meanwhile, the process of adding molten iron in the converter is optimized, the speed is increased firstly and then is decreased, the molten iron adding speed in the later period is reduced, and the impurity burning and the smoke release rate in the scrap steel in the iron adding period are controlled in a balanced manner to avoid explosive smoke release, so that the processing capacity of the dust removal system is fully exerted.
The height of the burning flame at the furnace mouth and the release speed of the smoke dust are monitored in the whole process, the rotating speed of the dust removal fan and the molten iron charging speed are adjusted in real time, and the whole molten iron charging time is controlled to be more than 3 minutes.
In the specific production: when a 150t converter is used, the total charging amount of molten iron and scrap steel is 158t, the total weight of the scrap steel is 28t, and if the weight of the low-grade packaging block scrap steel exceeds 10t, the molten iron is violently combusted in the process of adding molten iron and a large amount of black smoke is generated, so that the smooth production is limited; and then controlling the charging amount of the low-grade packed scrap steel blocks to be below 5t, wherein the proportion of the packed scrap steel blocks to the total amount of the scrap steel is lower than 20%, and realizing the smoke generation control of molten iron charging by matching with an improved molten iron charging operation mode.
The method comprises the following specific steps of hot metal charging operation of the converter: the converter raw materials are loaded according to the sequence of adding molten iron after scrap steel, the molten iron adding operation is stable and slow, and the operating speed of a dust removal fan is controlled to be more than 1700 r/min; controlling the release and treatment of combustion smoke dust, monitoring the height of combustion flame at a furnace mouth and the release speed of the smoke dust in the whole process, and adjusting the rotating speed of a dust removal fan and the speed of molten iron mixing in real time; strictly executing the process requirements of molten iron adding of the converter, wherein the process is performed at first, and then at last, the molten iron adding speed is reduced, the impurity burning and the smoke dust release rate in the scrap steel in the iron adding period are controlled in a balanced manner, and the capacity of the converter is fully exerted within the existing capacity range of a dust removal system; the whole time for adding molten iron is controlled to be more than 3 minutes.
The above-mentioned embodiments are intended to illustrate the objects, technical solutions and advantages of the present invention in further detail, and it should be understood that the above-mentioned embodiments are merely exemplary embodiments of the present invention, and are not intended to limit the scope of the present invention, and any modifications, equivalent substitutions, improvements and the like made within the spirit and principle of the present invention should be included in the scope of the present invention.
Claims (9)
1. A method for controlling the smoking of converter scrap steel into a converter, the method comprising:
dividing a steel scrap pool area according to the type grade of the steel scrap, wherein the steel scrap pool area comprises a type of steel scrap, common steel scrap and a low-grade packaging block steel scrap area, and counting the weight of the steel scrap in the steel scrap pool area;
according to the weight of the scrap steel, the scrap steel is produced according to the technical requirements of the charging bucket proportioning of the scrap steel charged into the furnace in different grades.
2. The method of claim 1, wherein the method further comprises:
and (3) establishing a process for adding molten iron in the converter, controlling the molten iron adding speed according to the height of the combustion flame of the converter, and controlling the molten iron adding time to be more than 3 minutes.
3. The method of claim 1, wherein the type of scrap, general scrap, and low grade bale scrap specifically comprises:
the first kind of scrap steel is: the interior of the steel scrap does not contain inflammable matters and impurities;
the common steel scrap comprises: scrap containing combustible substances of oil stain, rubber and plastics, wherein the weight of the combustible substances does not exceed 0.5 percent of the total weight of the common scrap;
the low-grade packaging block scrap steel is as follows: scrap containing combustible materials of oil, rubber, plastic and paint, the weight of said combustible materials exceeding 0.5% of the total weight of the scrap of the low grade bale.
4. The method of claim 1, wherein the production according to the steel scrap weight and the steel scrap charging bucket proportioning technical requirements of different grades of steel scrap entering the furnace specifically comprises:
in each furnace production, the weight of the one type of scrap steel is more than 50% of the total amount of the scrap steel in the furnace, the weight of the common scrap steel is 30 +/-2% of the total amount of the scrap steel in the furnace, the weight of the low-grade packaging block scrap steel is less than 20% of the total amount of the scrap steel in the furnace, and the sum of the weight of the common scrap steel and the weight of the low-grade packaging block scrap steel is less than 50% of the total amount of the scrap steel in the furnace.
5. The method of claim 4, wherein the method comprises:
when a 150t converter is used, the total charging amount of molten iron and scrap steel is 158t, the total weight of the scrap steel is 28t, and if the weight of the low-grade packaging block scrap steel exceeds 10t, the molten iron is violently combusted in the process of adding molten iron and a large amount of black smoke is generated, so that the smooth production is limited; and then controlling the charging amount of the low-grade packed scrap steel blocks to be below 5t, wherein the proportion of the packed scrap steel blocks to the total amount of the scrap steel is lower than 20%, and realizing the smoke generation control of molten iron charging by matching with an improved molten iron charging operation mode.
6. The method of claim 2, wherein the converter hot metal charging process specifically comprises:
in each furnace production, charging is carried out according to the sequence of adding molten iron after scrap steel is advanced, and the operating speed of a dust removal fan of the converter is controlled to be more than 1700 r/min.
7. The method according to claim 3, characterized in that said scrap of a type comprises in particular: processing the punched sheet bulk material and the cold-pressed block by an automobile cold-rolled sheet machine; cold-pressed blocks produced entirely from the materials of the ship and the plant.
8. The method according to claim 3, wherein the general scrap steel comprises: the material is disassembled to train wheel, axle, bogie, heavy rail and train, or large rail beam steel structure, or the material is even, the material type is clear in one color bar section steel, steel plate and gear machine parts, or ship body, factory building, automobile disassembly scrap steel.
9. The method of claim 3, wherein the low grade bale scrap comprises in particular: the external part of various domestic scrap steels is packed by cold-rolled stamping sheets, and the internal part of the various domestic scrap steels is scrap iron.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987170.6A CN110714109A (en) | 2019-10-17 | 2019-10-17 | Method for controlling smoke emission of converter scrap steel |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201910987170.6A CN110714109A (en) | 2019-10-17 | 2019-10-17 | Method for controlling smoke emission of converter scrap steel |
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| Publication Number | Publication Date |
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| CN110714109A true CN110714109A (en) | 2020-01-21 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN201910987170.6A Withdrawn CN110714109A (en) | 2019-10-17 | 2019-10-17 | Method for controlling smoke emission of converter scrap steel |
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| CN (1) | CN110714109A (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114549940A (en) * | 2022-04-27 | 2022-05-27 | 阿里巴巴（中国）有限公司 | Image processing method |
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