CN116011149A - Method for determining target moving-out temperature of RH refining furnace - Google Patents
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Abstract
The invention provides a method for determining the target moving-out temperature of an RH refining furnace, which relates to the technical field of ferrous metallurgy and comprises the following steps: s1, determining main influencing factors of the superheat degree of a tundish; s2, obtaining target removal superheat degree of the RH refining furnace according to main influencing factors; s21, acquiring the original design target delivery temperature of each tank of molten steel according to the target delivery temperatures of different steel grades; s22, calculating according to the deviation value to obtain the superheat degree of the tundish of each tank of molten steel at the original design target delivery temperature; s23, performing linear regression analysis on main influencing factors according to the superheat degree of the tundish of each tank of molten steel at the original design target removal temperature to obtain the target removal superheat degree of the RH refining furnace; s3, obtaining the actual target removal temperature of the RH refining furnace according to the target removal superheat degree of the RH refining furnace. The invention quantifies the target delivery temperature control calculation process, thereby formulating a refining delivery temperature control method for RH various steel types and achieving the purpose of accurately controlling the superheat degree of the tundish.
Description
Technical Field
The invention relates to the technical field of ferrous metallurgy, in particular to a method for determining the target moving-out temperature of an RH refining furnace.
Background
From the production point of view of continuous casting process, the proper superheat degree of the tundish has great significance for casting smooth operation, and excessively high superheat degree of molten steel can cause steel leakage of a continuous casting machine, so that the drawing speed is reduced to increase the thickness of a billet shell, production interruption is caused when serious, and excessively low superheat degree can cause solidification of molten steel due to low temperature, and a large amount of steel materials are lost when production interruption occurs. From the quality point of view, the control of the superheat degree of the tundish has important significance on the internal quality of high alloy steel grades, such as segregation and the like, and has important influence on the surface inclusion of IF steel and the like with strict requirements. Therefore, proper control of the superheat degree of the tundish is the basis for ensuring the production smooth and quality guarantee of the continuous casting process. The refining removal temperature directly influences the control of the superheat degree of the tundish.
The existing tundish superheat degree control method is as follows: according to the superheat degree requirement of the steel tundish, a target removal temperature is designed, which is usually obtained by the liquidus temperature of the steel tundish, the superheat degree of the tundish and a fixed temperature compensation value, and is adjusted within a range of +/-15 ℃ according to production experience under the condition of the target removal temperature.
However, the existing tundish superheat degree control method is seriously dependent on experience judgment of people, operators with insufficient experience are difficult to accurately control the tundish superheat degree, even operators with rich experience have larger deviation range of the tundish superheat degree control, and stable control of the tundish superheat degree cannot be realized.
Disclosure of Invention
In view of the above, the invention aims to provide a method for determining the target moving-out temperature of an RH refining furnace, so as to solve the technical problem of low control precision of the existing tundish superheat degree control method.
The invention adopts the following technical means:
a method for determining the target carrying-out temperature of an RH refining furnace comprises the following steps:
s1, determining main influencing factors of the superheat degree of a tundish;
s11, establishing a database by taking steel-making process production data as a sample;
s12, performing correlation analysis on all process parameters which influence the control of the carrying-out temperature of the RH refining furnace except the refining carrying-out temperature to obtain main influencing factors;
s2, obtaining target removal superheat degree of the RH refining furnace according to main influencing factors;
s21, acquiring the original design target delivery temperature of each tank of molten steel according to the target delivery temperatures of different steel grades;
s22, calculating a deviation value between the superheat degree of the tundish and the actual temperature based on the original design target delivery temperature of each tank of molten steel, and calculating the superheat degree of the tundish of each tank of molten steel at the original design target delivery temperature according to the deviation value;
s23, according to the superheat degree of the tundish of each tank of molten steel at the original design target delivery temperature, unifying follow-up data of the superheat degree of the tundish, and carrying out linear regression analysis on main influencing factors to obtain the target delivery superheat degree of the RH refining furnace;
s3, obtaining the actual target removal temperature of the RH refining furnace according to the target removal superheat degree of the RH refining furnace.
Further, in S1, the operation parameters include casting order of the casting machine, casting time, standing time, state of the large tank, and external temperature, and the main influencing factors include casting time and standing time.
Further, in S2, the calculation formula of the target removal superheat degree of the RH refining furnace is:
T1＝A-A1×t1-A2×t2
wherein T1 is the superheat degree of the tundish at the moving-out temperature of the original design target of the RH refining furnace, A is a temperature correction constant, A1 is the temperature drop rate in the continuous casting process, T1 is the time consumption of continuous casting, A2 is the temperature drop rate in the standing process after RH moving-out, and T2 is the standing time after RH moving-out.
Further, in S3, the calculation formula of the actual target moving-out temperature of the RH refining furnace is:
T＝T0-(T1-T2)
wherein T is the actual target moving-out temperature of the RH refining furnace, T1 is the superheat degree of the tundish at the original design target moving-out temperature of the RH refining furnace, and T0 is the original design target moving-out temperature of the RH refining furnace; t2 is the target superheat degree of the tundish.
Further, in S12, correlation analysis is performed on each process parameter by Minitab software, so as to obtain a P value of each process parameter, and when the P value is less than 0.05, the correlation is obvious, and the lower the P value, the stronger the correlation.
The invention also provides a storage medium comprising a stored program, wherein the program is used for executing the RH refining furnace target moving-out temperature determining method according to any one of the above methods when running.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that the processor runs and executes any RH refining furnace target moving-out temperature determining method through the computer program.
Compared with the prior art, the invention has the following advantages:
according to the invention, large data analysis is carried out on the basis of a large amount of actual tundish superheat data, influences of various process parameters such as casting sequence, casting time, standing time, large tank state, external temperature and the like on the carry-out temperature are explored, regression analysis is carried out, the target superheat is reached, the target carry-out temperature control calculation process is quantified, and therefore, a refining carry-out temperature control method of RH various steel types is formulated, and the aim of accurately controlling the tundish superheat is achieved;
the invention can stably produce, and avoid various production accidents and steel loss caused by excessively high or excessively low superheat degree of the tundish;
the invention can stabilize the quality, has positive significance for guaranteeing the internal quality and the surface quality of the casting blank, and does not provide a guiding direction for developing the low superheat degree steel grade;
the invention can avoid unnecessary aluminum oxygen reaction heating or scrap steel cooling in the RH refining furnace treatment process, and saves the production cost.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are required in the embodiments or the description of the prior art will be briefly described, and it is obvious that the drawings in the following description are some embodiments of the present invention, and other drawings may be obtained according to the drawings without inventive effort to a person skilled in the art.
FIG. 1 is a flow chart of the method of the present invention.
Detailed Description
In order that those skilled in the art will better understand the present invention, a technical solution in the embodiments of the present invention will be clearly and completely described below with reference to the accompanying drawings in which it is apparent that the described embodiments are only some embodiments of the present invention, not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present invention without making any inventive effort, shall fall within the scope of the present invention.
It should be noted that the terms "first," "second," and the like in the description and the claims of the present invention and the above figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the data so used may be interchanged where appropriate such that the embodiments of the invention described herein may be implemented in sequences other than those illustrated or otherwise described herein. Furthermore, the terms "comprises," "comprising," and "having," and any variations thereof, are intended to cover a non-exclusive inclusion, such that a process, method, system, article, or apparatus that comprises a list of steps or elements is not necessarily limited to those steps or elements expressly listed but may include other steps or elements not expressly listed or inherent to such process, method, article, or apparatus.
As shown in fig. 1, the invention provides a method for determining the target carry-out temperature of an RH refining furnace, comprising the following steps:
1. defining main influencing factors of superheat degree of tundish
A large amount of production data are selected as samples, a database is established, and correlation analysis is carried out on all technological parameters which influence the control of the carrying-out temperature of the RH refining furnace except the refining carrying-out temperature, wherein the technological parameters comprise the casting sequence of a casting machine, the casting time, the standing time, the state of a large tank, the external temperature and the like, and are shown in a table 1. The data selection is single refining position processing, double-flow casting before machine and tank time and turnover tank data when the transfer interval time of the removal re-tank is more than or equal to 150 min.
TABLE 1 Multi-parameter correlation analysis
The main influencing factors which are considered to influence the carrying-out temperature through the correlation result and the preliminary analysis are as follows: casting time and standing time. Two other data with P value of 0 are actual superheat degree of the middle ladle and casting sequence: the actual superheat degree of the middle ladle is required to be compared with the target superheat degree, and the superheat degree is directly corrected and carried out by utilizing the deviation; the casting sequence is mainly affected by the first casting tank and the process tank.
2. Calculation formula for determining target moving-out superheat degree of RH refining furnace
Each tank of molten steel has the original design target removal temperature T 0 The temperature is only related to the steel type, the same steel type is a fixed constant, all data are converted according to the original design target delivery temperature, if each tank is produced according to the original design target delivery temperature, the superheat degree of the tundish is more deviated than the actual one, so that the superheat degree T of the tundish of each tank at the original design target delivery temperature is calculated 1 This is the case when the RH refining furnace target carry-out temperature is eliminated. And the tundish is overheated after being unifiedThe degree data, for example, the actual delivery temperature 1565 ℃ and the actual tundish superheat degree 30 ℃ are 1565-1560=5 ℃ when the original design target delivery temperature is 1560 ℃, and 30-5=25 ℃ when the actual delivery temperature and the target delivery temperature are deviated from each other. Carrying out linear regression analysis on the casting time and the standing time through Minitab software to obtain a calculation formula of the actual superheat degree of the tundish of the RH refining furnace under the condition of the original design target removal temperature:
T 1 ＝A-A 1 ×t 1 -A 2 ×t 2
wherein: t (T) 1 -tundish superheat degree (c) at the original design target carry-out temperature of the RH refining furnace;
a-temperature correction constant (. Degree. C.);
A 1 -the rate of temperature drop (c/min) during continuous casting;
t 1 continuous casting and casting takes time (min);
A 2 -temperature drop rate (DEG C/min) during the standing process after RH is carried out;
t 2 -standing time (min) after RH is carried out.
T is in 1 、t 2 Can be calculated in advance according to actual production conditions, A, A 1 、A 2 The parameters are determined by carrying out regression analysis on the data according to the actual steel classification and the pouring order of the tundish (first tank and process tank).
3. Determining the actual target removal temperature of RH refining furnace
According to T 1 Calculating an actual target carrying-out temperature of the RH refining furnace by a calculation formula:
T＝T 0 -(T 1 -T 2 )
wherein: t-actual target carry-out temperature of RH refining furnace (DEG C);
T 0 -RH refining furnace design target carry-out temperature (°c);
T 2 -middle energizerThe target superheat degree (DEG C) of the ladle is obtained.
Finally, the logical relation of the actual target moving-out temperatures of the RH refining furnaces of various steel types is arranged and then is put into a production system, and t is provided by the production system 1 T 2 And (3) automatically calculating T, and guiding the on-site RH refining furnace to carry out a temperature treatment target at a treatment end point so as to achieve the aim of accurately controlling the superheat degree of the tundish.
The invention also provides a storage medium comprising a stored program, wherein the program is used for executing the RH refining furnace target moving-out temperature determining method according to any one of the above methods when running.
The invention also provides an electronic device, which comprises a memory, a processor and a computer program stored in the memory and capable of running on the processor, and is characterized in that the processor runs and executes any RH refining furnace target moving-out temperature determining method through the computer program.
Examples
The method for determining the target carrying-out temperature of the RH refining furnace comprises the following steps:
taking IF steel casting process tank production as an example, the original design target removal temperature of a conventional production steel type RH refining furnace is 1594 ℃, and the target superheat degree of a tundish is 30 ℃.
1. Determining target removal superheat degree and actual target removal temperature of RH refining furnace
Calculating the fluctuation of RH (relative humidity) moving temperature of a steel type process tank in actual production between 1605 and 1585 ℃, IF the moving temperature of a certain tank is 1592 ℃, the casting time is 40min, the standing time is 35min, the actual tundish superheat degree is 25 ℃, and the tundish superheat degree is calculated to be the superheat degree (25+2) =27 ℃ under the original design moving temperature because the moving temperature is lower than the original design moving temperature (1594-1592) =2 ℃, after a large amount of data are converted, carrying out linear regression analysis according to the casting time and the standing time parameters, so as to obtain the target moving superheat degree calculation formula of the IF steel process tank RH refining furnace as T 1 =50.9-0.315 t1-0.344t2, i.e. a=50.9, a 1 =0.315, a2=0.344 is still exemplified by the above data, t1=26.1 ℃.
According to T 1 Calculation formula t=t for calculating actual target moving-out temperature of RH refining furnace 0 -(T 1 -T 2 ) The result is t= 1597.9 ℃, rounded to 1598 ℃, i.e. the actual target removal temperature of the tank, e.g. RH finery, is 1598 ℃, the tundish superheat should be 30 ℃.
2. Determination of various steel types A, A of RH refining furnace 1 、A 2
Regression analysis is performed according to the data and the actual steel classification and the pouring order sequence (first tank and process tank) of the tundish respectively to obtain a table 2:
TABLE 2
Finally, the actual target carrying-out temperature can be automatically calculated by being incorporated into an RH refining furnace control model, so as to guide operators to process molten steel.
The foregoing embodiment numbers of the present invention are merely for the purpose of description, and do not represent the advantages or disadvantages of the embodiments.
In the foregoing embodiments of the present invention, the descriptions of the embodiments are emphasized, and for a portion of this disclosure that is not described in detail in this embodiment, reference is made to the related descriptions of other embodiments.
In the several embodiments provided in the present application, it should be understood that the disclosed technology content may be implemented in other manners. The above-described embodiments of the apparatus are merely exemplary, and the division of the units, for example, may be a logic function division, and may be implemented in another manner, for example, a plurality of units or components may be combined or may be integrated into another system, or some features may be omitted, or not performed. Alternatively, the coupling or direct coupling or communication connection shown or discussed with each other may be through some interfaces, units or modules, or may be in electrical or other forms.
The units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of units. Some or all of the units may be selected according to actual needs to achieve the purpose of the solution of this embodiment.
In addition, each functional unit in the embodiments of the present invention may be integrated in one processing unit, or each unit may exist alone physically, or two or more units may be integrated in one unit. The integrated units may be implemented in hardware or in software functional units.
The integrated units, if implemented in the form of software functional units and sold or used as stand-alone products, may be stored in a computer readable storage medium. Based on such understanding, the technical solution of the present invention may be embodied essentially or in part or all of the technical solution or in part in the form of a software product stored in a storage medium, including instructions for causing a computer device (which may be a personal computer, a server, or a network device, etc.) to perform all or part of the steps of the method according to the embodiments of the present invention. And the aforementioned storage medium includes: a U-disk, a Read-only memory (ROM), a random access memory (RAM, randomAccessMemory), a removable hard disk, a magnetic disk, or an optical disk, or other various media capable of storing program codes.
Finally, it should be noted that: the above embodiments are only for illustrating the technical solution of the present invention, and not for limiting the same; although the invention has been described in detail with reference to the foregoing embodiments, it will be understood by those of ordinary skill in the art that: the technical scheme described in the foregoing embodiments can be modified or some or all of the technical features thereof can be replaced by equivalents; such modifications and substitutions do not depart from the spirit of the invention.
Claims (7)
1. The method for determining the target carrying-out temperature of the RH refining furnace is characterized by comprising the following steps of:
s1, determining main influencing factors of the superheat degree of a tundish;
s11, establishing a database by taking steel-making process production data as a sample;
s12, performing correlation analysis on all process parameters which influence the control of the carrying-out temperature of the RH refining furnace except the refining carrying-out temperature to obtain main influencing factors;
s2, obtaining target removal superheat degree of the RH refining furnace according to main influencing factors;
s21, acquiring the original design target delivery temperature of each tank of molten steel according to the target delivery temperatures of different steel grades;
s22, calculating a deviation value between the superheat degree of the tundish and the actual temperature based on the original design target delivery temperature of each tank of molten steel, and calculating the superheat degree of the tundish of each tank of molten steel at the original design target delivery temperature according to the deviation value;
s23, according to the superheat degree of the tundish of each tank of molten steel at the original design target delivery temperature, unifying follow-up data of the superheat degree of the tundish, and carrying out linear regression analysis on main influencing factors to obtain the target delivery superheat degree of the RH refining furnace;
s3, obtaining the actual target removal temperature of the RH refining furnace according to the target removal superheat degree of the RH refining furnace.
2. The method for determining the target take-out temperature of an RH refining furnace according to claim 1, wherein in S1, the operation parameters include casting order of the casting machine, casting time, standing time, state of large tank, external temperature, and the main influencing factors include casting time and standing time.
3. The method for determining a target removal temperature of an RH refining furnace according to claim 1, wherein in S2, the calculation formula of the target removal superheat of the RH refining furnace is:
T 1 ＝A-A 1 ×t 1 -A 2 ×t 2
wherein T is 1 At the target moving-out temperature designed for the RH refining furnaceIs the superheat degree of the tundish, A is a temperature correction constant, A 1 For the temperature drop rate in the continuous casting process, t 1 Time consuming for continuous casting, A 2 For the temperature drop rate, t, in the standing process after RH is carried out 2 The RH is carried out and then left for a rest time.
4. The method for determining a target delivery temperature of an RH refining furnace according to claim 1, wherein in S3, the calculation formula of the actual target delivery temperature of the RH refining furnace is:
T＝T 0 -(T 1 -T 2 )
wherein T is the actual target moving-out temperature of the RH refining furnace, T 1 The superheat degree T of the tundish at the target moving-out temperature is designed for the RH refining furnace 0 Designing a target moving-out temperature for an RH refining furnace; t (T) 2 Target superheat degree of the tundish.
5. The method for determining the target moving-out temperature of the RH refining furnace according to claim 1, wherein in S12, correlation analysis is performed on each process parameter by Minitab software to obtain a correlation coefficient P of each process parameter, and when the P value is smaller than 0.05, the correlation is obvious, and the lower the P value is, the stronger the correlation is.
6. A storage medium comprising a stored program, wherein the program, when run, performs the RH finery target take-out temperature determination method of any one of claims 1 to 5.
7. An electronic device comprising a memory, a processor and a computer program stored on the memory and executable on the processor, wherein the processor is operative to perform the method of determining the target take-out temperature of the RH refining furnace of any of claims 1 to 5 by means of the computer program.
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| CN116393661A (en) * | 2023-06-07 | 2023-07-07 | 山东钢铁股份有限公司 | Method and device for determining steel feeding temperature |
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