CN114309080B - Method for judging direct hot charging of conventional hot continuous rolling production line - Google Patents
Method for judging direct hot charging of conventional hot continuous rolling production line Download PDFInfo
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Abstract
The invention relates to a method for judging direct hot charging by a conventional hot continuous rolling production line, and belongs to the technical field of hot feeding hot charging methods. The technical scheme of the invention is as follows: and (3) defining direct loading and hot loading by taking the slab transfer setting time as a basis, obtaining the corresponding relation between the slab transfer setting time and the furnace charging temperature according to least square multiplication and statistics, and determining the furnace charging temperature and the furnace charging mode of the slab by utilizing the slab transfer setting time. The beneficial effects of the invention are as follows: the method can rapidly and accurately judge, count and analyze the direct loading and the hot loading, accurately judge, count and analyze the direct loading and hot loading rate of the plate blank, improve the direct loading and hot loading of the plate blank, and is safe, reliable, flexible, convenient and simple to operate.
Description
Technical Field
The invention relates to a method for judging direct hot charging by a conventional hot continuous rolling production line, and belongs to the technical field of hot feeding hot charging methods.
Background
Along with the aggravation of enterprise competition, the reduction of the product cost is the pursuit goal of each large iron and steel enterprise, the hot feeding and hot charging technology can effectively reduce the energy consumption and improve the productivity, and simultaneously, the high requirements are provided for the production management, the information management and the logistics management of the enterprise.
The continuous casting slab hot feeding and hot loading process is that the slab after continuous casting and cutting is immediately conveyed to a heating furnace (or a buffer device such as a slab warehouse and a heat preservation pit) through a railway or a roller way, and is loaded into the heating furnace at a higher temperature. The continuous casting billet hot charging process is divided into Hot Charging Rolling (HCR) and Direct Hot Charging Rolling (DHCR), wherein the charging temperature is 400-600 ℃, and the charging temperature is more than 600.
The implementation of the hot feeding and hot charging process can also play roles of reducing energy consumption, shortening production period, reducing iron scale loss, improving product quality, improving metal yield and the like. Therefore, the ratio of hot feed hot charging and direct hot charging rolling can be improved, and obvious economic benefits can be brought.
In general, the direct charge refers to the number of hot continuous casting billets having a surface temperature of 600 ℃ or more and no surface defects when charged into a heating furnace, and the direct charge rate refers to the ratio of the number of hot continuous casting billets directly charged to the number of all qualified continuous casting billets fed into the heating furnace. The hot charging quantity refers to the quantity of hot continuous casting billets with the surface temperature of the continuous casting billets being more than or equal to 400 ℃ and no defects on the surface when the hot continuous casting billets are charged into a heating furnace, and the hot charging rate refers to the ratio of the quantity of hot continuous casting billets to the quantity of all qualified continuous casting billets entering the heating furnace.
If a certain hot rolling 2250mm is directly connected with a steelmaking process through a conveying roller way, and meanwhile, a slab warehouse is arranged between the hot rolling and steelmaking, so that conditions are provided for direct loading and hot feeding, and the direct loading and hot feeding can be realized.
The traditional direct loading and hot loading are defined by taking the steel loading temperature as a basis, and the steel loading temperature mainly comes from a temperature measuring instrument in front of a roller way of the heating furnace and is written into a second stage of the heating furnace. Due to the characteristics of the sealing property of the secondary model, the temperature of the secondary charging furnace can only be inquired, and the electronic version data can not be derived, so that the secondary charging furnace can only be manually transcribed, and is inconvenient for statistics and analysis of a large amount of data.
Meanwhile, when the continuous casting slab is just produced from a steel mill, the temperature is up to more than 700-1000 ℃, and the temperature is more than 1000 ℃ in the production process, so that iron scales with the thickness of 1-5mm exist on the surface of the continuous casting slab, and part of the iron scales on the upper surface are separated from the iron matrix. Because the temperature detector in front of the heating furnace roller way can only detect the temperature of the upper surface of the plate blank, when the iron scale on the surface of the plate blank is thicker and even is separated from the iron matrix, the temperature detection is much lower, even the detection temperature data is 0 ℃, and the detection data is inaccurate, therefore, a new definition concept needs to be established, and the statistics and the analysis of the direct loading and the hot loading rate are more accurate and more convenient.
Disclosure of Invention
The invention aims to provide a method for judging direct hot charging by a conventional hot continuous rolling production line, which is characterized in that direct charging and hot charging are defined by taking slab transfer time as a basis, the corresponding relation between the slab transfer time and charging temperature is obtained according to least square multiplication and statistics, and the charging temperature and charging mode of a slab are determined by utilizing the slab transfer time, so that the direct charging and the hot charging can be judged and statistically analyzed rapidly and accurately, the direct charging rate of the slab can be judged, counted and analyzed accurately, the direct charging of the slab is improved, the safety, reliability, flexibility and convenience are realized, the operation is simple, and the problems in the background technology are solved effectively.
The technical scheme of the invention is as follows: a method for judging direct hot charging by a conventional hot continuous rolling production line comprises the following steps:
(1) The method comprises the steps of defining direct loading and hot loading by taking slab transfer setting time as a basis, wherein the slab transfer setting time is equal to the difference between steel loading time and slab cutting time;
(2) Fitting the steel loading temperature of the strip steel with the data of the slab laying time to obtain a fitting corresponding curve and formula of the steel loading temperature and the slab laying time, wherein the relation formula of the steel loading temperature and the slab laying time is as follows:
y=0.0001x 4 -0.0102x 3 +0.4715x 2 -20.802x+718.77, wherein y is the steel loading temperature in degrees centigrade; x is the plate blank shelf time, and the unit is h;
(3) And according to the steel loading temperature range of the direct loading and the hot loading distinction, converting to obtain the corresponding slab transfer and rest time of the direct loading and the hot loading distinction.
The steel loading temperature range of the direct loading and the hot loading is different, wherein the steel loading temperature is equal to or higher than 600 ℃ and is equal to or higher than 400 ℃ and is the hot loading; and the corresponding slab transfer and laying time distinguished by direct loading and hot loading is that the slab transfer and laying time is less than or equal to 6h and is not more than 22h and is hot loading, and the slab transfer and laying time is not more than 22h and is not more than 40h and is warm loading.
The beneficial effects of the invention are as follows: the method has the advantages that the direct loading and the hot loading are defined by taking the plate blank transfer time as a basis, the corresponding relation between the plate blank transfer time and the furnace charging temperature is obtained according to the least square method and statistics, the furnace charging temperature and the furnace charging mode of the plate blank are determined by utilizing the plate blank transfer time, the direct loading and the hot loading can be rapidly and accurately judged and statistically analyzed, the direct loading and the hot loading rate of the plate blank can be accurately judged, counted and analyzed, the direct loading and the hot loading of the plate blank is improved, and the method is safe, reliable, flexible and convenient, and simple to operate.
Drawings
FIG. 1 is a graph corresponding to the fit of the steel loading temperature and the slab resting time of the present invention;
FIG. 2 is a three stage MES system interface of the present invention with increased shelf life of the slab.
Detailed Description
In order to make the objects, technical solutions and advantages of the embodiments of the present invention more clear, the technical solutions of the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in the embodiments, and it is apparent that the described embodiments are a small part of the embodiments of the present invention, but not all embodiments, and all other embodiments obtained by those skilled in the art without making creative efforts based on the embodiments of the present invention are included in the protection scope of the present invention.
A method for judging direct hot charging by a conventional hot continuous rolling production line comprises the following steps:
(1) The method comprises the steps of defining direct loading and hot loading by taking slab transfer setting time as a basis, wherein the slab transfer setting time is equal to the difference between steel loading time and slab cutting time;
(2) Fitting the steel loading temperature of the strip steel with the data of the slab laying time to obtain a fitting corresponding curve and formula of the steel loading temperature and the slab laying time, wherein the relation formula of the steel loading temperature and the slab laying time is as follows:
y=0.0001x 4 -0.0102x 3 +0.4715x 2 -20.802x+718.77, wherein y is the steel loading temperature in degrees centigrade; x is the plate blank shelf time, and the unit is h;
(3) And according to the steel loading temperature range of the direct loading and the hot loading distinction, converting to obtain the corresponding slab transfer and rest time of the direct loading and the hot loading distinction.
The steel loading temperature range of the direct loading and the hot loading is different, wherein the steel loading temperature is equal to or higher than 600 ℃ and is equal to or higher than 400 ℃ and is the hot loading; and the corresponding slab transfer and laying time distinguished by direct loading and hot loading is that the slab transfer and laying time is less than or equal to 6h and is not more than 22h and is hot loading, and the slab transfer and laying time is not more than 22h and is not more than 40h and is warm loading.
Examples:
1. study on the relation and characteristics of charging temperature and slab transfer and rest time
The traditional direct loading and hot loading are defined by taking the steel loading temperature as a basis, and the steel loading temperature mainly comes from a temperature measuring instrument in front of a roller way of the heating furnace and is written into a second stage of the heating furnace. Due to the characteristics of the sealing property of the secondary model, the temperature of the secondary charging furnace can only be inquired, and the electronic version data can not be derived, so that the secondary charging furnace can only be manually transcribed, and is inconvenient for statistics and analysis of a large amount of data.
Meanwhile, when the continuous casting slab is just produced from a steel mill, the temperature is up to more than 700-1000 ℃, and the temperature is more than 1000 ℃ in the production process, so that iron scales with the thickness of 1-5mm exist on the surface of the continuous casting slab, and part of the iron scales on the upper surface are separated from the iron matrix. As the temperature detector in front of the roller way of the heating furnace can only detect the temperature of the upper surface of the slab, when the iron scale on the surface of the slab is thicker and even is separated from the iron matrix, the temperature detection is much lower and even the detection temperature data is 0 ℃.
Therefore, a new set of definition concepts is needed to facilitate more accurate and convenient statistics and analysis of direct and hot fill rates. The problem can be perfectly solved by defining the direct loading and the hot loading based on the slab transfer time (i.e. the difference between the steel loading time and the slab cutting time).
Fitting is carried out according to the data of the steel loading temperature and the slab transfer shelf time of 372 coils of strip steel from 9 months of a certain hot rolling mill, a fitting corresponding curve and formula of the steel loading temperature and the slab transfer shelf time are obtained, and the corresponding slab transfer shelf time is obtained through conversion according to the temperature ranges of direct loading (the steel loading temperature is more than or equal to 600 ℃) and hot loading (the steel loading temperature is more than or equal to 400 ℃), so that the concepts of direct loading and hot loading are redefined.
Fitting according to the actual information of 372 rolls of strip steel from 9 months in a hot rolling mill to obtain a relational expression of the steel loading temperature and the plate blank laying time, wherein the relational expression is as follows:
y=0.0001x 4 -0.0102x 3 +0.4715x 2 -20.802x+718.77
wherein y is the steel loading temperature in the unit of DEG C; x is the plate blank laying time and the unit is h.
According to the relation, when the steel loading temperature is 600 ℃, the plate blank laying time is 6.5h; when the steel loading temperature is 400 ℃, the plate blank laying time is 22.3h, and when the steel loading temperature is more than or equal to 200 ℃, the plate blank laying time is less than or equal to 40h.
According to the information, the plate blank laying time is defined as direct loading, the plate blank laying time is defined as less than or equal to 6h, the plate blank laying time is defined as less than or equal to 22h, the plate blank laying time is defined as hot loading, and the plate blank laying time is defined as less than or equal to 22h, and the plate blank laying time is defined as warm loading.
2. Direct-loading hot-loading rate statistics feature
According to the new definitions of direct loading and hot loading, the plate blank transfer and placement time is increased on the interface of the three-stage MES system, so that the charging mode of each plate blank can be conveniently and accurately judged, and the method is suitable for statistics and analysis of mass data.
As shown in fig. 2, in the case of the same slab transfer shelf time in the same heat, the deviation of the charging temperature detected by the thermometer is large, the fluctuation is 100 ℃ and even 600 ℃, and the temperature of the slab core is practically nearly the same. This is clearly a disturbance and influence of the scale on the upper surface of the slab on the temperature detection, which leads to inaccuracy in the temperature detection. The method adopted by the invention realizes one-to-one correspondence of the furnace charging temperature and the plate blank laying time, and the plate blank laying time is very accurate, so that the distinction, judgment and statistics of hot charging and direct charging are very accurate.
3. The implementation effect is as follows:
since the implementation of the technology, the direct hot charging rate of the slab is accurately judged, counted and analyzed, so that the direct hot charging slab is improved, and the comprehensive burning-up of the heating furnace is reduced by 0.5 Kg/ton.
The total yield of a hot rolling 2250mm production line in 2020 is 500 ten thousand tons, the heating burning cost is 1.2 yuan/kg of standard coal, and then annual creation efficiency = total yield x the heating furnace burning reduction value x standard coal cost unit price
=500×0.5×1.2=300 ten thousand yuan.
Claims (1)
1. A method for judging direct hot charging by a conventional hot continuous rolling production line is characterized by comprising the following steps of:
(1) The method comprises the steps of defining direct loading and hot loading by taking slab transfer setting time as a basis, wherein the slab transfer setting time is equal to the difference between steel loading time and slab cutting time;
(2) Fitting the steel loading temperature of the strip steel with the data of the slab laying time to obtain a fitting corresponding curve and formula of the steel loading temperature and the slab laying time, wherein the relation formula of the steel loading temperature and the slab laying time is as follows:
y=0.0001x 4 -0.0102x 3 +0.4715x 2 -20.802x+718.77, wherein y is the steel loading temperature in degrees centigrade; x is the plate blank shelf time, and the unit is h;
(3) According to the temperature range of the steel in the direct loading and the hot loading, converting to obtain the corresponding slab transfer and rest time in the direct loading and the hot loading;
the steel loading temperature range of the direct loading and the hot loading is different, wherein the steel loading temperature is equal to or higher than 600 ℃ and is equal to or higher than 400 ℃ and is the hot loading; and the corresponding slab transfer and laying time distinguished by direct loading and hot loading is that the slab transfer and laying time is less than or equal to 6h and is not more than 22h and is hot loading, and the slab transfer and laying time is not more than 22h and is not more than 40h and is warm loading.
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Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1753008A (en) * | 2005-10-26 | 2006-03-29 | 上海宝信软件股份有限公司 | Method of optimization hot rolling scaduled sequence |
| JP2006181583A (en) * | 2004-12-27 | 2006-07-13 | Jfe Steel Kk | Method for producing continuously cast slab |
| JP2007246994A (en) * | 2006-03-16 | 2007-09-27 | Jfe Steel Kk | Charging method to heating furnace |
| JP2008080395A (en) * | 2006-08-28 | 2008-04-10 | Jfe Steel Kk | Heating furnace charging order determining method and apparatus for the determination |
| JP2009178740A (en) * | 2008-01-31 | 2009-08-13 | Jfe Steel Corp | Method and device for preparing rolling schedule in hot-rolling shop |
| CN102059331A (en) * | 2010-11-26 | 2011-05-18 | 首钢总公司 | Continuous casting blank hot charging and hot conveying process for preventing surface crack of steel plate |
| CN106269873A (en) * | 2016-07-29 | 2017-01-04 | 安阳钢铁股份有限公司 | Utilize the method that holding pit and single heating furnace tandem rolling produce hot-rolled orientation silicon steel |
| JP2017104904A (en) * | 2015-11-30 | 2017-06-15 | Ｊｆｅスチール株式会社 | Heating furnace slab charging temperature prediction system |
| CN112380688A (en) * | 2020-11-10 | 2021-02-19 | 衡阳华菱钢管有限公司 | Method for determining casting blank temperature and feeding temperature, storage medium and processor |
-
2021
- 2021-11-29 CN CN202111434350.5A patent/CN114309080B/en active Active
Patent Citations (9)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2006181583A (en) * | 2004-12-27 | 2006-07-13 | Jfe Steel Kk | Method for producing continuously cast slab |
| CN1753008A (en) * | 2005-10-26 | 2006-03-29 | 上海宝信软件股份有限公司 | Method of optimization hot rolling scaduled sequence |
| JP2007246994A (en) * | 2006-03-16 | 2007-09-27 | Jfe Steel Kk | Charging method to heating furnace |
| JP2008080395A (en) * | 2006-08-28 | 2008-04-10 | Jfe Steel Kk | Heating furnace charging order determining method and apparatus for the determination |
| JP2009178740A (en) * | 2008-01-31 | 2009-08-13 | Jfe Steel Corp | Method and device for preparing rolling schedule in hot-rolling shop |
| CN102059331A (en) * | 2010-11-26 | 2011-05-18 | 首钢总公司 | Continuous casting blank hot charging and hot conveying process for preventing surface crack of steel plate |
| JP2017104904A (en) * | 2015-11-30 | 2017-06-15 | Ｊｆｅスチール株式会社 | Heating furnace slab charging temperature prediction system |
| CN106269873A (en) * | 2016-07-29 | 2017-01-04 | 安阳钢铁股份有限公司 | Utilize the method that holding pit and single heating furnace tandem rolling produce hot-rolled orientation silicon steel |
| CN112380688A (en) * | 2020-11-10 | 2021-02-19 | 衡阳华菱钢管有限公司 | Method for determining casting blank temperature and feeding temperature, storage medium and processor |
Non-Patent Citations (5)
| Title |
|---|
| 曹树卫 ; 王向松 ; 陈冬至 ; .热连轧直接热装节能降耗生产实践.轧钢.2018,(05),第84-87页. * |
| 温治,向顺华,高仲龙,刘铁树.连铸坯热送热装热过程数学模型的开发应用.工业炉.1997,(02),第3-6+13页. * |
| 王岭,魏钢城,张志宏,宋平,曾健鸣.武钢热轧厂热送热装技术.轧钢.2004,(02),第33-36页. * |
| 郝小红 ; 温治 ; 安月明 ; 佘广夫 ; 薛念福 ; .连铸坯装炉温度在线实时计算模型及其应用.系统仿真学报.2007,(14),第3324-3326页. * |
| 陈瑛.宽厚钢板轧机概论.冶金工业出版社,2011,第188页. * |
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