CN109280746B - Dynamic control method for KR desulfurization stirring - Google Patents
Dynamic control method for KR desulfurization stirring Download PDFInfo
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- CN109280746B CN109280746B CN201811450685.4A CN201811450685A CN109280746B CN 109280746 B CN109280746 B CN 109280746B CN 201811450685 A CN201811450685 A CN 201811450685A CN 109280746 B CN109280746 B CN 109280746B
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- stirring paddle
- stirring
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- paddle
- dynamic control
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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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- Engineering & Computer Science (AREA)
- Materials Engineering (AREA)
- Metallurgy (AREA)
- Organic Chemistry (AREA)
- Refinement Of Pig-Iron, Manufacture Of Cast Iron, And Steel Manufacture Other Than In Revolving Furnaces (AREA)
Abstract
The invention provides a dynamic control method for KR desulfuration stirring, wherein after KR desulfuration is started, when a stirring paddle is lowered to a target position and the revolution reaches more than 90% of a rated revolution, a primary PLC sends the revolution n of the stirring paddle to a secondary computer. Starting a stirring paddle dynamic control program by a secondary computer, and 1) starting timing; after 3-5 min, reducing the speed of the stirring paddle by 50-100 mm, wherein the descending speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s; 2) the lifting speed of the stirring paddle is 80-150 mm, the lifting speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s; 3) the descending speed of the stirring paddle is 1-3 m/min and is 30-50 mm; 4) the stirring paddle continues to desulfurize for 1-2 min, and the first stage action is finished; 5) and (4) returning the stirring paddle to the position when the stirring paddle dynamic control program is started, namely the target position in the step one. The method for dynamically adjusting the speed and the insertion depth of the stirring paddle is adopted, and aims to reduce the reaction dead zone of molten iron in the molten iron tank and improve the desulfurization efficiency under the condition of not increasing the amount of a desulfurizing agent.
Description
Technical Field
The invention relates to the technical field of steelmaking KR desulfurization, in particular to a dynamic control method for KR desulfurization stirring.
Background
The KR stirring type desulfurization method is characterized in that a stirrer with an outer lining made of refractory material is immersed into a molten iron tank to rotationally stir molten iron, so that a desulfurizing agent is added while the molten iron generates a vortex, and the molten iron is involved into the molten iron to fully react, thereby achieving the aim of molten iron desulfurization. The method has the characteristics of high desulfurization efficiency, low desulfurizer consumption, small molten iron temperature reduction, short operation time, low metal loss, low refractory material consumption and the like, and is suitable for steel mills with high requirements and large proportion of low-sulfur and ultra-low-sulfur steel varieties. However, in the actual desulfurization process, the desulfurization result does not meet the target requirement due to factors such as unreasonable insertion depth of the stirring paddle, corrosion deformation of the stirring paddle, corrosion change of the tank wall and the tank bottom of the hot-metal tank and the like.
Therefore, in the KR production process, the insertion depth of the stirring paddle is dynamically adjusted according to different conditions, so that the problems can be solved, the utilization rate of the desulfurizer is improved, the national policy of modifying the traditional industry by using high and new technologies is met, the implementation of the project is very necessary for promoting the development of desulfurization, and the economic benefit and the social benefit are very obvious.
Disclosure of Invention
In order to solve the problems in the background art, the invention provides a dynamic control method for KR desulfurization stirring, which adopts a method for dynamically adjusting the speed and the insertion depth of a stirring paddle and aims to reduce the reaction dead zone of molten iron in a molten iron tank and improve the desulfurization efficiency without increasing the amount of a desulfurizing agent.
In order to achieve the purpose, the invention adopts the following technical scheme:
a dynamic control method for KR desulfurization stirring comprises the following steps:
step one, after KR desulfurization is started, the first-stage PLC controls the stirring paddle to descend to a target position H.
And step two, starting the rotating motor of the stirring paddle, and when the primary PLC detects that the rotating speed of the stirring paddle reaches more than 90% of the rated rotating speed, the primary PLC sends the rotating speed n of the stirring paddle to the secondary computer.
And step three, after the secondary computer receives a rotating speed n message of the first-level PLC of the stirring paddle, starting a dynamic control program of the stirring paddle by the secondary computer, wherein the dynamic control program of the stirring paddle comprises the following specific steps:
1) starting a stirring paddle control program and starting timing; after 3-5 min, reducing the speed of the stirring paddle by 50-100 mm, wherein the descending speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
2) the lifting speed of the stirring paddle is 80-150 mm, the lifting speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
3) the descending speed of the stirring paddle is 1-3 m/min and is 30-50 mm;
4) the stirring paddle continues to desulfurize for 1-2 min, and the first stage action is finished;
5) returning the stirring paddle to the position when the dynamic control program of the stirring paddle is started, namely the target position in the step one;
6) and executing the next stage action according to steps 1) to 5).
And step four, after the desulfurization stirring time reaches the target set time given by the secondary computer, the secondary computer sends a lifting command to the first-stage PLC of the stirring paddle, the stirring paddle is lifted, and the KR desulfurization stirring is finished.
The target position H of the stirring paddle in the step one is determined according to the following formula:
H＝H0+h+(Ma-M0)*K
wherein: h is the target position of the stirring paddle and is in unit mm;
H0the numerical value of the descending position of the stirring paddle when the stirring paddle descends to the molten iron liquid level is unit mm;
h is the height of a stirring paddle blade in unit mm;
ma is the actual amount of molten iron charged, unit t;
M0the minimum amount of molten iron to satisfy the KR treatment, unit t;
k is an empirical constant and is taken to be 6.0-6.5 mm/t.
Compared with the prior art, the invention has the beneficial effects that:
1. the method for dynamically adjusting the speed and the insertion depth of the stirring paddle is adopted, and aims to reduce the reaction dead zone of molten iron in the molten iron tank and improve the desulfurization efficiency under the condition of not increasing the amount of a desulfurizing agent.
2. The control function of dynamically adjusting the speed and the insertion depth of the stirring paddle is realized by adding a dynamic control program of the stirring paddle of a secondary computer and data communication messages of the first-level PLC and the secondary computer of the rotation number of the stirring paddle.
3. By determining the target position H of the stirring paddle, the stirring paddle is started to rotate after descending to the target position, and meanwhile, when the rotating speed reaches a certain standard, dynamic stirring is carried out, so that the efficiency of the stirring process is improved.
Detailed Description
The following describes in detail specific embodiments of the present invention.
A dynamic control method for KR desulfurization stirring comprises the following steps:
step one, after KR desulfurization is started, a first-stage PLC controls a stirring paddle to descend to a target position H;
step two, starting a stirring paddle rotating motor, and when the primary PLC detects that the rotating speed of the stirring paddle reaches more than 90% of the rated rotating speed (generally 100-125 r/min), the primary PLC sends the rotating speed n of the stirring paddle to a secondary computer;
and step three, after the secondary computer receives a rotating speed n message of the first-level PLC of the stirring paddle, starting a dynamic control program of the stirring paddle by the secondary computer, wherein the dynamic control program of the stirring paddle comprises the following specific steps:
1) starting a stirring paddle control program and starting timing; after 3-5 min, reducing the speed of the stirring paddle by 50-100 mm, wherein the descending speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
2) the lifting speed of the stirring paddle is 80-150 mm, the lifting speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
3) the descending speed of the stirring paddle is 1-3 m/min and is 30-50 mm;
4) the stirring paddle continues to desulfurize for 1-2 min, and the first stage action is finished;
5) returning the stirring paddle to the position when the dynamic control program of the stirring paddle is started, namely the target position in the step one;
6) and executing the next stage action according to steps 1) to 5).
And step four, after the desulfurization stirring time reaches the target set time given by the secondary computer, the secondary computer sends a lifting command to the first-stage PLC of the stirring paddle, the stirring paddle is lifted, and the KR desulfurization stirring is finished.
The target position H of the stirring paddle in the step one is determined according to the following formula:
H＝H0+h+(Ma-M0)*K
wherein: h is the target position of the stirring paddle and is in unit mm;
H0the numerical value of the descending position of the stirring paddle when the stirring paddle descends to the molten iron liquid level is unit mm;
h is the height of a stirring paddle blade in unit mm;
ma is the actual amount of molten iron charged, unit t;
M0the minimum amount of molten iron to satisfy the KR treatment, unit t;
k is an empirical constant and is taken to be 6.0-6.5 mm/t.
The above embodiments are implemented on the premise of the technical solution of the present invention, and detailed embodiments and specific operation procedures are given, but the scope of the present invention is not limited to the above embodiments. The methods used in the above examples are conventional methods unless otherwise specified.
Claims (2)
1. A dynamic control method for KR desulfuration stirring is characterized by comprising the following steps:
step one, after KR desulfurization is started, a first-stage PLC controls a stirring paddle to descend to a target position H;
step two, starting a stirring paddle rotating motor, and when the primary PLC detects that the rotating speed of the stirring paddle reaches more than 90% of the rated rotating speed, the primary PLC sends the rotating speed n of the stirring paddle to a secondary computer;
and step three, after the secondary computer receives the rotating speed n telegraph text of the first-stage PLC of the stirring paddle, starting a dynamic control program of the stirring paddle by the secondary computer, wherein the dynamic control program of the stirring paddle comprises the following specific steps:
1) starting a stirring paddle control program and starting timing; after 3-5 min, reducing the speed of the stirring paddle by 50-100 mm, wherein the descending speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
2) the lifting speed of the stirring paddle is 80-150 mm, the lifting speed of the stirring paddle is 1-3 m/min, and the stirring time is 30-60 s;
3) the descending speed of the stirring paddle is 1-3 m/min and is 30-50 mm;
4) the stirring paddle continues to desulfurize for 1-2 min, and the first stage action is finished;
5) returning the stirring paddle to the position when the dynamic control program of the stirring paddle is started, namely the target position in the step one;
6) executing the next stage action according to steps 1) to 5);
and step four, after the desulfurization stirring time reaches the target set time given by the secondary computer, the secondary computer sends a lifting command to the first-stage PLC of the stirring paddle, the stirring paddle is lifted, and the KR desulfurization stirring is finished.
2. The method as claimed in claim 1, wherein the target position H of the paddle in the first step is determined according to the following formula:
H＝H0+h+(Ma-M0)*K
wherein: h is the target position of the stirring paddle and is in unit mm;
H0the numerical value of the descending position of the stirring paddle when the stirring paddle descends to the molten iron liquid level is unit mm;
h is the height of a stirring paddle blade in unit mm;
ma is the actual amount of molten iron charged, unit t;
M0the minimum amount of molten iron to satisfy the KR treatment, unit t;
k is an empirical constant and is taken to be 6.0-6.5 mm/t.
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| CN109988879A (en) * | 2019-04-03 | 2019-07-09 | 山东钢铁股份有限公司 | A method of the raising desulfurizing agent volume applied to KR desulfurizing iron process inhales effect |
| CN111057816B (en) * | 2019-12-13 | 2021-11-05 | 首钢京唐钢铁联合有限责任公司 | Method and device for stirring molten iron |
| CN111394535A (en) * | 2020-03-30 | 2020-07-10 | 安徽工业大学 | Step-by-step KR stirring desulfurization method for molten iron |
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| JP3643553B2 (en) * | 2001-11-29 | 2005-04-27 | 新日本製鐵株式会社 | KR impeller deposit removing apparatus and method |
| CN102234703B (en) * | 2010-04-23 | 2013-03-20 | 宝山钢铁股份有限公司 | On-line thermal state cleaning method for accumulated burl on mechanical desulfuration stirring paddle by using knotted reactor (KR) method |
| CN103146868B (en) * | 2013-03-08 | 2014-08-13 | 中冶南方工程技术有限公司 | Novel double-motor mixing head control system and method for KR molten iron desulfuration |
| CN104263872B (en) * | 2014-09-22 | 2016-01-20 | 山东钢铁股份有限公司 | A kind of ladder pre-heating technique improving stirring rake thermostability |
| CN104313246A (en) * | 2014-11-24 | 2015-01-28 | 武汉钢铁(集团)公司 | Control method applied to KR desulfurization method |
| CN107586913B (en) * | 2017-08-25 | 2019-12-20 | 宁波钢铁有限公司 | High-efficiency stirring desulfurization method |
| CN108588318B (en) * | 2018-05-22 | 2019-11-08 | 武汉钢铁有限公司 | Molten iron mechanical stirring efficient low-consume sulfur method |
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