CN114164312B - Molten steel tapping transfer method for steel-making production converter - Google Patents
Molten steel tapping transfer method for steel-making production converter Download PDFInfo
- Publication number
- CN114164312B CN114164312B CN202111308136.5A CN202111308136A CN114164312B CN 114164312 B CN114164312 B CN 114164312B CN 202111308136 A CN202111308136 A CN 202111308136A CN 114164312 B CN114164312 B CN 114164312B
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- Prior art keywords
- ladle
- converter
- molten steel
- steel
- tapping
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 82
- 239000010959 steel Substances 0.000 title claims abstract description 82
- 238000004519 manufacturing process Methods 0.000 title claims abstract description 54
- 238000010079 rubber tapping Methods 0.000 title claims abstract description 26
- 238000009628 steelmaking Methods 0.000 title claims abstract description 21
- 238000000034 method Methods 0.000 title claims abstract description 18
- 238000012546 transfer Methods 0.000 title description 10
- 239000002893 slag Substances 0.000 claims description 22
- 244000080575 Oxalis tetraphylla Species 0.000 claims description 10
- 238000007670 refining Methods 0.000 claims description 6
- 230000007246 mechanism Effects 0.000 claims description 5
- 230000032258 transport Effects 0.000 claims description 4
- XEEYBQQBJWHFJM-UHFFFAOYSA-N Iron Chemical compound [Fe] XEEYBQQBJWHFJM-UHFFFAOYSA-N 0.000 abstract description 32
- 229910052742 iron Inorganic materials 0.000 abstract description 16
- 238000003723 Smelting Methods 0.000 abstract description 11
- 238000005266 casting Methods 0.000 abstract description 8
- 230000009466 transformation Effects 0.000 abstract description 6
- 238000009749 continuous casting Methods 0.000 description 5
- XKRFYHLGVUSROY-UHFFFAOYSA-N Argon Chemical compound [Ar] XKRFYHLGVUSROY-UHFFFAOYSA-N 0.000 description 4
- 239000013049 sediment Substances 0.000 description 4
- 239000004020 conductor Substances 0.000 description 3
- 238000010586 diagram Methods 0.000 description 3
- 230000004048 modification Effects 0.000 description 3
- 238000012986 modification Methods 0.000 description 3
- 238000006467 substitution reaction Methods 0.000 description 3
- 229910052786 argon Inorganic materials 0.000 description 2
- 238000013461 design Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 238000009434 installation Methods 0.000 description 2
- 238000011161 development Methods 0.000 description 1
- 230000007613 environmental effect Effects 0.000 description 1
- 230000006872 improvement Effects 0.000 description 1
- 230000007306 turnover Effects 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
- C21C5/42—Constructional features of converters
- C21C5/46—Details or accessories
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/12—Travelling ladles or similar containers; Cars for ladles
-
- 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)
- Mechanical Engineering (AREA)
- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Carbon Steel Or Casting Steel Manufacturing (AREA)
Abstract
The invention relates to the technical field of converter molten steel production, in particular to a method for transferring molten steel tapping of a converter in steelmaking production. According to the invention, the reverse conveying channels of the molten steel span and the molten iron span in the traditional steelmaking area are opened, the equipment transformation cost is low, one set of converter smelting system can supply molten steel required by the production of the casting machine in the production lines of different areas, the operation is simple, and the use efficiency of converter equipment is greatly improved.
Description
Technical Field
The invention relates to the technical field of converter molten steel production, in particular to a method for transferring molten steel tapping of a converter in steelmaking production.
Background
In the traditional section bar manufacturing and steelmaking area, the adopted mainstream converter steelmaking smelting mode is generally a one-way design of advancing and then discharging, namely: the train pushes molten iron into a factory building (molten iron bay), the molten iron enters a furnace for smelting (charging bay), molten steel discharged from a converter is put into a ladle (furnace bay), the ladle is hoisted to an LF furnace for treatment (refining bay), and the ladle is hoisted to a casting machine platform (molten steel bay) by a crown block. The production mode is a first-to-last assembly line production process, molten steel is transported on the assembly line, the molten steel is transported to a casting machine platform after being discharged, the production requirement of a subsequent continuous casting machine is met, however, along with the development of a steelmaking production mode, multiple production lines need to be additionally arranged in a steelmaking area, such as an ESP (electronic stability program) manufacturing production line, the ESP needs to be discharged by a converter for molten steel production, equipment transformation is needed when multiple production line converter discharge is carried out in the existing molten steel transportation mode, the cost is high, the operation is troublesome, the efficiency is low, and the transportation requirement for discharge of the ESP manufacturing production line cannot be well met by the single discharge mode.
Disclosure of Invention
Aiming at the technical problems of high equipment transformation cost, inconvenience in operation and low efficiency in transferring converter tapping to an ESP (electronic stability program) manufacturing workshop in the prior art, the invention provides a method for transferring molten steel tapping of a converter in steelmaking production.
The invention provides a molten steel tapping transfer method for a converter in steelmaking production, which comprises the steps of extending a lower track of the converter in the reverse direction, connecting the extended lower track with a molten iron cross track, connecting the extended lower track with the molten iron cross track to form an extended track, placing a ladle after tapping of the converter, transferring the ladle to a ladle car of the lower track, transporting the ladle car to the molten iron cross through the extended track, hoisting the ladle to a train tank frame by the molten iron cross crane, and transporting the ladle to a workshop of an ESP manufacturing department by the train. The track only leads to the sediment under former stove and strides, satisfies sediment basin transportation demand, needs to stride to the molten iron through extension track, just can satisfy the demand of new mode, through leveling to the scene place, the equipment transformation along the line of passageway, the ground is rebuild, and the track installation has solved the restriction bottleneck that the molten iron strides can't directly be driven to the buggy ladle.
Furthermore, after tapping of the converter, molten steel is put into a steel ladle, and the steel ladle can be transferred to a refining span or a molten steel span, so that the requirement of the molten steel of a continuous casting machine in the existing smelting area can be met. The invention realizes that one set of converter smelting system can supply molten steel required by the production of casting machines in production lines of different areas, thereby greatly improving the service efficiency of converter equipment.
Furthermore, a slag car is arranged on the track, the slag car and the buggy ladle are distributed on two sides of the converter, and the running direction of the buggy ladle is the molten iron crossing direction. In the original production mode, the ladle car is arranged at the south side of the lower track of the furnace, the slag car is arranged at the north side of the lower track of the furnace, and after the production mode is changed, the positions of the ladle car and the slag car need to be changed so as to meet the requirement of smooth operation of the ladle car in the molten iron crossing direction.
Furthermore, the steel ladle is provided with a cover adding and uncovering mechanism, and the aim is to ensure the temperature of molten steel in the steel ladle.
Furthermore, the ladle is subjected to covering and uncovering operation on the extension track, the conventional ladle covering is carried out on a converter argon station platform through a hydraulic covering and uncovering mechanism, a gantry crane is arranged above the extension track, and the ladle is subjected to covering and uncovering operation in a hoisting mode, so that the environmental protection requirement of the ladle out of a factory building is met, and the temperature drop of the ladle is reduced.
Furthermore, the number of the gantry cranes is at least 1.
Furthermore, the buggy ladle is provided with a cable drum for supplying power, and the running directions of the buggy ladle cable drum and the buggy ladle are consistent; the slag car is provided with a cable drum for supplying power, the running direction of the slag car cable drum is consistent with that of the slag car, the problem that cables of the buggy ladle and the slag car are mutually wound is solved, and the fault rate of the car body is greatly reduced.
The invention has the advantages that the invention improves the transfer mode of the existing converter smelting molten steel, changes the unidirectional design of the converter molten steel from forward movement and then discharge into forward movement and forward discharge, has low modification cost, can effectively reduce the time from the steel ladle to the molten steel cross transfer, and shortens the turnover time of the steel ladle; the invention realizes that one set of converter smelting system can additionally supply molten steel required by the production of the casting machine of the production line of the ESP manufacturing area, thereby greatly improving the service efficiency of converter equipment.
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 flow chart of a molten steel tapping transfer method according to an embodiment of the present invention.
FIG. 2 is a route diagram of tapping of molten steel from a converter according to the prior art.
FIG. 3 is a route diagram of a converter molten steel tapping line in an ESP manufacturing area according to the prior art.
Fig. 4 is a molten steel tapping route diagram according to an embodiment 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 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.
Example 1
As shown in fig. 2, the production flow of steelmaking in the section bar manufacturing part in the prior art is shown, the whole area is in the north-south direction, a train rail for transportation is arranged on the north side of the steelmaking area, the train transports molten iron on the train rail, the train pushes the molten iron into a factory building (molten iron bay), the molten iron enters a furnace for smelting (charging bay), the molten steel discharged from the converter is placed into a ladle (furnace bay), the ladle is hoisted to an LF furnace for treatment (refining bay), the ladle is hoisted to a casting machine table (molten steel bay) by a crown block, and the steel discharging mode of the whole converter is forward and backward (north-south direction), so that the production requirements of a subsequent continuous casting machine are met. In actual production, according to actual needs, molten steel produced by a converter needs to be supplied to an ESP manufacturing part externally to meet production requirements of the ESP manufacturing part, and therefore molten steel produced by a 120T-type steel converter needs to be rotated to a molten steel bay, as shown in FIG. 3, FIG. 3 shows a molten steel tapping production line for producing the converter in an ESP manufacturing area in the prior art, after steel is tapped by the converter, a steel ladle filled with the molten steel is opened to a refining bay or a molten steel bay, then the steel ladle is hung to a cross-over vehicle connected with the molten steel bay by a crown block, after the steel ladle reaches the molten steel bay, the molten steel bay crown block is hung to a train tank frame, and the train transports the steel ladle to a workshop of the ESP manufacturing part for use by a continuous casting machine of the ESP manufacturing part.
According to the invention, as shown in figure 4, a lower track of a converter furnace in figures 2 and 3 is extended reversely, and the extended track is connected with a molten iron cross track, as shown in figure 1, a steel ladle is placed after the converter steel is tapped, the steel ladle is placed on a ladle car of the lower track of the converter furnace, the ladle car is transported to the molten iron cross track through the extended track, the molten iron cross crown block directly hoists the steel ladle to a train tank frame, and the train transports the steel ladle to a workshop of an ESP manufacturing department.
The invention is an improvement of the traditional molten steel external supply transfer method, and the molten steel span and the molten iron span are communicated through a reverse conveying channel, so that two tapping modes of forward-forward/forward-backward tapping of a converter are realized, and the molten steel after the converter is transferred to a workshop of an ESP manufacturing department for use while the molten steel is supplied to a casting machine table in a smelting area; after the molten steel is transferred to the ladle, the ladle can also be transferred to a refining span or a molten steel span, and the molten steel requirement of a continuous casting machine in the existing smelting area is met. The invention realizes that one set of converter smelting system can supply molten steel required by the production line casting machine production in different areas, thereby greatly improving the service efficiency of converter equipment.
The track only leads to the sediment under current converter stove and strides, satisfies the sediment basin transportation demand, need stride to the molten iron through the extension track, just can satisfy the demand of new mode, through leveling to the scene place, the equipment transformation along the passageway, the ground is rebuild, and the track installation has solved the ladle car and can't directly be driven the restriction bottleneck that the molten iron strides.
In the existing production mode, the ladle car is arranged at the south side of the lower track of the furnace, the slag car is arranged at the north side of the lower track of the furnace, and the positions of the ladle car and the slag car on the tracks need to be changed, so that the ladle car smoothly runs in the molten iron crossing direction. After slag car, buggy ladle transfer the position, do not reform transform because of the cable reel and shift, buggy ladle's cable reel still is in south side, and the cable reel of slag car still is in north side, and the position of reel and the traffic direction of automobile body are carried on the back mutually, when causing on-the-spot staff to operate buggy ladle or slag car, often appear buggy ladle cable conductor and slag car cable conductor and twine the phenomenon each other, scrape bad cable conductor easily, cause the automobile body not to move. The invention shifts the cable reel of the car body, the shifting north side of the cable reel of the buggy ladle is consistent with the running direction of the buggy ladle, and the shifting south side of the cable reel of the slag car is consistent with the running direction of the slag car. Through the transformation, the problem that cables of the buggy ladle and the slag car are mutually wound is solved, and the fault rate of the buggy body is greatly reduced.
By the transfer method of the embodiment 1, the molten steel transportation time is reduced by 15-20 min/furnace according to the existing production distance compared with the method of the production route in the figure 3, and the transfer efficiency is greatly improved.
Example 2
The steel ladle is provided with the cover adding and uncovering mechanism, and aims to ensure the temperature of molten steel in the steel ladle. Furthermore, the ladle is subjected to covering and uncovering operation on the extension track, the conventional ladle covering is carried out on a converter argon station platform through a hydraulic covering and uncovering mechanism, the gantry cranes are arranged above the extension track, the number of the gantry cranes is 2, and the ladle is subjected to covering and uncovering operation in a hoisting mode, so that the environment-friendly requirement of the ladle out of a factory building is met, and the temperature drop of the ladle is reduced. By the operation of adding and uncovering the ladle cover by the gantry crane, the temperature drop of the molten steel is reduced by 30 percent.
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. A method for transferring molten steel tapping of a converter in steelmaking production is characterized in that a lower track of the converter is extended reversely, the extended lower track of the converter is connected with a molten iron cross track, the extended lower track is connected with the lower track of the converter and is an extended track, molten steel is placed into a ladle after tapping of the converter, the ladle is transferred to a ladle car of the lower track of the converter, the ladle car is transported to the molten iron cross through the extended track, the molten iron cross overhead traveling crane lifts the ladle to a train tank frame, and the train transports the ladle to a workshop of an ESP manufacturing department.
2. The method for transferring molten steel tapping of the steel-making production converter according to claim 1, wherein after tapping of the converter, the molten steel is placed in a ladle, and the ladle is further transferred to a refining bay or a molten steel bay.
3. The method for transporting molten steel tapping from a converter for steelmaking production as claimed in claim 1, wherein a slag car is provided on the lower track of the converter, the slag car and the ladle car are disposed on both sides of the converter, and the direction of travel of the ladle car is the molten iron-striding direction.
4. The method for transferring molten steel tapping from a steel making converter according to claim 1, wherein the ladle is provided with a cover-adding and-uncovering mechanism.
5. The method for transferring molten steel tapping from a steel making converter according to claim 4, wherein the ladle is subjected to a covering and uncovering operation on the extended track.
6. The method for transferring molten steel tapping of the steel-making converter according to claim 5, wherein a gantry crane is provided above the extended rail, and the ladle is covered and uncovered by lifting.
7. The method for transferring molten steel tapping of the steelmaking converter as set forth in claim 6, wherein the number of gantry cranes is at least 1.
8. The method for transporting molten steel tapping of the steel making converter according to claim 4, wherein the buggy ladle is provided with a cable reel for supplying power, and the cable reel of the buggy ladle is in the same direction as the buggy ladle; the slag car is provided with a cable drum for supplying power, and the running directions of the cable drum of the slag car and the slag car are consistent.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308136.5A CN114164312B (en) | 2021-11-05 | 2021-11-05 | Molten steel tapping transfer method for steel-making production converter |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202111308136.5A CN114164312B (en) | 2021-11-05 | 2021-11-05 | Molten steel tapping transfer method for steel-making production converter |
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| Publication Number | Publication Date |
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| CN114164312A CN114164312A (en) | 2022-03-11 |
| CN114164312B true CN114164312B (en) | 2022-11-18 |
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| Application Number | Title | Priority Date | Filing Date |
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| CN202111308136.5A Active CN114164312B (en) | 2021-11-05 | 2021-11-05 | Molten steel tapping transfer method for steel-making production converter |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN114643354A (en) * | 2022-04-26 | 2022-06-21 | 山东钢铁集团永锋临港有限公司 | Method for realizing rapid positioning of buggy ladle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05192751A (en) * | 1991-12-27 | 1993-08-03 | Kawasaki Heavy Ind Ltd | Method for carrying ladle |
| EP0556938A2 (en) * | 1992-02-21 | 1993-08-25 | MANNESMANN Aktiengesellschaft | Continuous casting machine for horizontally casting metals |
| CN101892346A (en) * | 2010-06-22 | 2010-11-24 | 武汉钢铁(集团)公司 | Layout structure in converter steelmaking bidirectional steel supply system and method for arranging steel ladles and slag ladles |
| CN105033238A (en) * | 2015-07-30 | 2015-11-11 | 益阳金沙重型机械制造有限公司 | Production process for continuous casting and rolling of sheet steel |
| CN206779449U (en) * | 2017-06-15 | 2017-12-22 | 中冶华天工程技术有限公司 | The system of steel line of return off-line baking hot-metal bottle more than a kind of utilization |
-
2021
- 2021-11-05 CN CN202111308136.5A patent/CN114164312B/en active Active
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JPH05192751A (en) * | 1991-12-27 | 1993-08-03 | Kawasaki Heavy Ind Ltd | Method for carrying ladle |
| EP0556938A2 (en) * | 1992-02-21 | 1993-08-25 | MANNESMANN Aktiengesellschaft | Continuous casting machine for horizontally casting metals |
| CN101892346A (en) * | 2010-06-22 | 2010-11-24 | 武汉钢铁(集团)公司 | Layout structure in converter steelmaking bidirectional steel supply system and method for arranging steel ladles and slag ladles |
| CN105033238A (en) * | 2015-07-30 | 2015-11-11 | 益阳金沙重型机械制造有限公司 | Production process for continuous casting and rolling of sheet steel |
| CN206779449U (en) * | 2017-06-15 | 2017-12-22 | 中冶华天工程技术有限公司 | The system of steel line of return off-line baking hot-metal bottle more than a kind of utilization |
Non-Patent Citations (3)
| Title |
|---|
| 包钢薄板厂炼钢计划与时序管理***开发;郭凯等;《中国高新技术企业》;20151220(第36期);第14-15页 * |
| 基于混合遗传算法的两流薄板坯连铸连轧流程生产调度***;贺东风等;《北京科技大学学报》;20050425;第27卷(第02期);第240-244页 * |
| 转炉炉下钢包车轨道分析与改进;陈钢;《冶金设备》;20150215(第01期);第58-61页 * |
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| PE01 | Entry into force of the registration of the contract for pledge of patent right |
Denomination of invention: A method for transporting molten steel from converter in steelmaking production Effective date of registration: 20231215 Granted publication date: 20221118 Pledgee: Rizhao Bank Co.,Ltd. Pledgor: RIZHAO STEEL HOLDING GROUP Co.,Ltd. Registration number: Y2023980072204 |
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