CN111321265A - Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle - Google Patents
Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle Download PDFInfo
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- CN111321265A CN111321265A CN202010149404.2A CN202010149404A CN111321265A CN 111321265 A CN111321265 A CN 111321265A CN 202010149404 A CN202010149404 A CN 202010149404A CN 111321265 A CN111321265 A CN 111321265A
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- Prior art keywords
- stirring paddle
- rotating speed
- desulfurization
- slag throwing
- steelmaking
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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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- 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
- C21C7/0087—Treatment of slags covering the steel bath, e.g. for separating slag from the molten metal
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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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- Chemical & Material Sciences (AREA)
- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Analytical Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention discloses an automatic slag throwing method for a KR method desulfurization steelmaking stirring paddle, which comprises the following steps: 1) after the stirring paddle completes the rotary desulfurization operation in the steel ladle, the rotating speed is reduced to a first set rotating speed; 2) the stirring paddle keeps the first set rotating speed and is lifted to an automatic slag throwing station above the liquid level of the steel ladle; 3) the rotating speed of the stirring paddle is increased to a second set rotating speed; 4) the stirring paddle keeps the second set rotating speed and carries out slag throwing operation; 5) after the slag throwing operation is finished, reducing the rotating speed of the stirring paddle to the stopping rotating speed; 6) the stirring paddle keeps the parking rotating speed and is lifted to a standby position. The invention overcomes the defects of the existing manual mechanical slag removal operation, improves the automation level, reduces the equipment investment, reduces the labor intensity, improves the field operation environment of workers, improves the desulfurization efficiency, prolongs the service life of the stirring paddle and reduces the production cost.
Description
Technical Field
The invention relates to a molten iron pretreatment process in a steel plant, in particular to an automatic slag throwing method for a stirring paddle for KR-method desulfurization and steelmaking.
Background
The KR process desulfurizing station is one important hot metal pre-treating apparatus for steel plant to realize high efficiency and high quality production and to raise product quality, and has the operation principle of roasting cross stirring paddle of casting refractory material, rotating in certain amount of steel ladle to produce vortex, throwing certain amount of desulfurizing agent into the vortex area of hot metal to produce desulfurizing reaction between the desulfurizing agent and the sulfur in the hot metal in the vortex area. In the desulfurization production, the stirring paddle is directly inserted into molten steel to be stirred to generate vortex, so that the desulfurizer and sulfur are promoted to react, and the stirring paddle is important mechanical equipment in the desulfurization process.
For the life-span of improving the stirring rake, reduce the maintenance number of times of stirring rake, improve desulfurization efficiency, set up professional machinery on desulfurization maintenance work platform and scrape the sediment device usually, adopt the manual operation mode to clear up the sediment that glues on the stirring head. The manual mechanical cleaning method has the defects of severe field working environment, high labor intensity, high loss, low slag scraping efficiency, high cost and the like.
Disclosure of Invention
The purpose of the invention is as follows: the invention aims to provide an automatic slag throwing method for a KR method desulfurization steelmaking stirring paddle, which is used for replacing the laggard manual operation mechanical slag scraping method.
In order to achieve the purpose, the invention adopts the following technical scheme: a KR method desulfurization steelmaking stirring paddle automatic slag throwing method comprises the following steps:
1) after the stirring paddle completes the rotary desulfurization operation in the steel ladle, the rotating speed is reduced to a first set rotating speed;
2) the stirring paddle keeps the first set rotating speed and is lifted to an automatic slag throwing station above the liquid level of the steel ladle;
3) the rotating speed of the stirring paddle is increased to a second set rotating speed;
4) the stirring paddle keeps the second set rotating speed and carries out slag throwing operation;
5) after the slag throwing operation is finished, reducing the rotating speed of the stirring paddle to the stopping rotating speed;
6) the stirring paddle keeps the parking rotating speed and is lifted to a standby position.
Further, in the step 1), the deceleration rate is-2 r/min/s, and the first set rotating speed is 20-30 r/min.
Further, in the step 2), the distance between the lower end of the stirring paddle and the liquid level of the steel ladle is 5-15 cm.
Further, in the step 3), the acceleration rate is +1r/min/s, and the second set rotation speed is 40-50 r/min.
Further, in the step 4), the slag throwing operation time is 1 minute.
Further, in the step 5), the stopping rotating speed is lower than 30 r/min.
Has the advantages that: the automatic slag throwing and removing technology has the advantages of high efficiency, low cost, low labor intensity and high automation degree, can overcome the defects of the existing manual mechanical slag removing operation, improves the automation level, reduces the equipment investment, reduces the labor intensity, improves the field operation environment of workers, improves the desulfurization efficiency, prolongs the service life of the stirring paddle and reduces the production cost.
Drawings
FIG. 1 is a schematic view of the operational position of a KR desulfurization steelmaking stirring paddle;
in fig. 1: 1-hoisting the track; 2-hoisting the trolley; 3-a hoisting motor; 4-a stirring motor; 5-stirring paddle; 6-a mechanical slag scraper; 7-ladle.
FIG. 2 is a schematic flow diagram of an automatic slag throwing method of a KR desulfurization steelmaking stirring paddle.
FIG. 3 is a schematic diagram of the composition of a KR desulfurization steelmaking stirring paddle control system.
The specific implementation mode is as follows:
the invention is further explained below with reference to the drawings.
As shown in fig. 1, the stirring paddle 5 works through the hoisting trolley 2 to realize lifting work, the hoisting trolley 2 is installed on the hoisting track 1, the stirring paddle 5 rotates and is driven by the stirring motor 4, the stirring paddle of the existing desulfurization station is also designed with a mechanical slag scraper 6 which is manually operated, the stirring paddle 5 is driven by the hoisting trolley 2 to do lifting movement along the hoisting track 1, five parking positions are totally arranged on the movement track of the stirring paddle 5, wherein, H1 is the ascending limit position of the stirring paddle, H2 is the standby position of the stirring paddle, H3 is the automatic slag throwing working position of the stirring paddle, H4 is the desulfurization stirring working position of the stirring paddle, and H5 is the descending limit position of the stirring paddle. When the desulfurization operation is carried out, the stirring paddle descends to a position H4 from H2 for desulfurization stirring operation, after the desulfurization operation is completed, the stirring paddle ascends to a position H3 for automatic slag throwing operation, and after the slag throwing operation is completed, the stirring paddle ascends to a standby position.
As shown in figures 1 and 2, the automatic slag throwing method of the KR method desulfurization steelmaking stirring paddle comprises the following steps:
1) after the stirring paddle completes the rotary desulfurization operation in the steel ladle, the rotating speed is reduced to a first set rotating speed, the stirring paddle is still at the position of H4, the first set rotating speed is a rotating speed which is relatively lower than the rotating speed of the stirring paddle during the rotary desulfurization operation, the adhesion of the stirring paddle and the steel slag in the subsequent lifting process can be prevented, and preferably, the rotating speed of the stirring paddle is reduced to 20-30 r/min according to the speed reduction rate of-2 r/min/s;
2) the stirring paddle keeps the rotating speed of 20-30 r/min and is lifted to an automatic slag throwing station above the liquid level of the steel ladle from the position H4, namely the position H3, in the step, because the stirring paddle keeps a certain rotating speed in the lifting process, the relative motion between the stirring paddle and the molten steel can be ensured, the steel slag is not easy to adhere to the stirring paddle, the stirring paddle is positioned at the automatic slag throwing station, the automatic slag throwing operation is convenient, the lower end of the stirring paddle cannot be too far away from the liquid level of the molten steel or too close to the liquid level of the molten steel, and preferably, the lower end of the stirring paddle is 5-15 cm away from the liquid level;
3) the rotating speed of the stirring paddle is increased to a second set rotating speed, the second set rotating speed is the rotating speed required by automatic slag throwing, the rotating speed cannot be too fast or too slow, steel slag is easily thrown out of a steel ladle when the rotating speed is too fast, slag throwing effect is too poor or slag is not easily removed when the rotating speed is too slow, and preferably, the rotating speed of the stirring paddle is reduced to 40-50 r/min according to the acceleration rate of +1 r/min/s;
4) keeping the stirring paddle at 40-50 r/min, and performing slag throwing operation for 1 minute;
5) after the slag throwing operation is finished, the rotating speed of the stirring paddle is reduced to a stopping rotating speed which is lower than 30r/min, so that the stirring paddle can conveniently perform subsequent rotary desulfurization operation;
6) the stirring paddle keeps the stop rotating speed, is lifted to a standby position from the position H4, namely the position H2, and waits for an instruction to perform the next rotary desulfurization operation.
As shown in FIG. 3, the automatic slag throwing method of the KR desulfurization steelmaking stirring paddle is realized by an automatic control system, and the automatic control system comprises a central processing unit, a signal acquisition unit and an electric drive unit. The central processing unit comprises a PLC control cabinet and an HMI (human machine interface), wherein the PLC control cabinet is responsible for executing an automatic slag throwing control program and processing information of the human operation interface, the central processing unit selects the Siemens WINCC product from the Siemens S7-300/400 series of PLCs, and the HMI configuration software selects the Siemens WINCC product. The signal acquisition unit mainly gathers stirring rake operating position and stirring rake rotational speed through signal acquisition device, and the operating position information acquisition of stirring rake divide into mechanical travel switch position and photoelectric encoder signal, and photoelectric encoder selects SICK ATM60 series absolute value type encoder, and mechanical travel switch position is the switching value, and the reliability is high, and photoelectric encoder accuracy is high, adopts DP field bus technical communication between photoelectric encoder and the PLC. The electric driving unit comprises a hoisting frequency converter and a stirring frequency converter, is respectively responsible for driving the hoisting motor and the stirring motor, and simultaneously reads the rotating speed of the stirring paddle through the stirring frequency converter.
The automatic slag throwing method of the stirring paddle is carried out after the completion of the desulfurization stirring operation, except for adopting the automatic slag throwing program operation mode, whether the slag throwing operation is needed or not can be selected at the beginning stage of the desulfurization or in the desulfurization process, the selection can be specifically carried out through an HMI one-key operation instruction, and if the selection is carried out, the slag throwing program is automatically added into the desulfurization program to automatically operate.
The foregoing is only a preferred embodiment of the present invention, and it should be noted that, for those skilled in the art, various modifications and decorations can be made without departing from the principle of the present invention, and these modifications and decorations should also be regarded as the protection scope of the present invention.
Claims (6)
1. A KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized by comprising the following steps:
1) after the stirring paddle completes the rotary desulfurization operation in the steel ladle, the rotating speed is reduced to a first set rotating speed;
2) the stirring paddle keeps the first set rotating speed and is lifted to an automatic slag throwing station above the liquid level of the steel ladle;
3) the rotating speed of the stirring paddle is increased to a second set rotating speed;
4) the stirring paddle keeps the second set rotating speed and carries out slag throwing operation;
5) after the slag throwing operation is finished, reducing the rotating speed of the stirring paddle to the stopping rotating speed;
6) the stirring paddle keeps the parking rotating speed and is lifted to a standby position.
2. The KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized in that: in the step 1), the deceleration rate is-2 r/min/s, and the first set rotating speed is 20-30 r/min.
3. The KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized in that: in the step 2), the distance between the lower end of the stirring paddle and the liquid level of the steel ladle is 5-15 cm.
4. The KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized in that: in the step 3), the acceleration rate is +1r/min/s, and the second set rotation speed is 40-50 r/min.
5. The KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized in that: in the step 4), the slag throwing operation time is 1 minute.
6. The KR method desulfurization steelmaking stirring paddle automatic slag throwing method is characterized in that: in the step 5), the stopping rotating speed is lower than 30 r/min.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010149404.2A CN111321265A (en) | 2020-03-06 | 2020-03-06 | Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202010149404.2A CN111321265A (en) | 2020-03-06 | 2020-03-06 | Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle |
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| CN111321265A true CN111321265A (en) | 2020-06-23 |
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| CN202010149404.2A Pending CN111321265A (en) | 2020-03-06 | 2020-03-06 | Automatic slag throwing method for KR-method desulfurization steelmaking stirring paddle |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115971120A (en) * | 2023-02-08 | 2023-04-18 | 宝钢湛江钢铁有限公司 | Online thermal slag removal method for 350-ton KR stirring paddle |
Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3643553B2 (en) * | 2001-11-29 | 2005-04-27 | 新日本製鐵株式会社 | KR impeller deposit removing apparatus and method |
| CN103421926A (en) * | 2013-08-08 | 2013-12-04 | 中冶南方工程技术有限公司 | Intelligent control method of lifting trolley system of knotted reactor (KR) desulfurization |
| CN104313246A (en) * | 2014-11-24 | 2015-01-28 | 武汉钢铁(集团)公司 | Control method applied to KR desulfurization method |
| CN107449623A (en) * | 2016-05-31 | 2017-12-08 | 上海金艺检测技术有限公司 | Steel mill KR method molten iron desulphurization stirring device health status on-line monitoring methods |
| CN110055369A (en) * | 2019-05-21 | 2019-07-26 | 武汉钢铁有限公司 | Molten iron KR desulfurization blender dry slag quickly cleans method |
-
2020
- 2020-03-06 CN CN202010149404.2A patent/CN111321265A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP3643553B2 (en) * | 2001-11-29 | 2005-04-27 | 新日本製鐵株式会社 | KR impeller deposit removing apparatus and method |
| CN103421926A (en) * | 2013-08-08 | 2013-12-04 | 中冶南方工程技术有限公司 | Intelligent control method of lifting trolley system of knotted reactor (KR) desulfurization |
| CN104313246A (en) * | 2014-11-24 | 2015-01-28 | 武汉钢铁(集团)公司 | Control method applied to KR desulfurization method |
| CN107449623A (en) * | 2016-05-31 | 2017-12-08 | 上海金艺检测技术有限公司 | Steel mill KR method molten iron desulphurization stirring device health status on-line monitoring methods |
| CN110055369A (en) * | 2019-05-21 | 2019-07-26 | 武汉钢铁有限公司 | Molten iron KR desulfurization blender dry slag quickly cleans method |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN115971120A (en) * | 2023-02-08 | 2023-04-18 | 宝钢湛江钢铁有限公司 | Online thermal slag removal method for 350-ton KR stirring paddle |
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Application publication date: 20200623 |