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CN-117170437-B - Target temperature control system for whole steelmaking process

CN117170437BCN 117170437 BCN117170437 BCN 117170437BCN-117170437-B

Abstract

The invention relates to a steelmaking whole process target temperature control system, which belongs to the field of target temperature control and comprises a model parameter management module, a data preprocessing module, a temperature drop data processing module, a ladle temperature compensation module, a waiting process temperature drop calculation module, a converter target temperature calculation module, a converter blowing-stopping temperature calculation module, a refining outbound target temperature calculation module, a last refining target temperature calculation module, a liquidus temperature calculation module, a tundish target temperature calculation module, a bale target temperature calculation module, a process state display module and a historical data query module. The system realizes the closed-loop control of the overall process target temperature of the steelmaking process according to the target setting, prediction calculation, actual performance feedback and next process planning, and realizes that the tundish temperature management meets the process requirements.

Inventors

  • LIU ZHEN
  • LIU XIAOFENG
  • LIU JINWEN
  • FANG XIAOYUN
  • YIN CHUAN
  • HE WEIXIANG
  • HU CHANGZHI
  • ZHANG CHUANGJU
  • YAN QIAO
  • Cheng dian
  • CHEN LUTAO
  • HUANG GANG

Assignees

  • 重庆钢铁股份有限公司

Dates

Publication Date
20260505
Application Date
20230925

Claims (9)

  1. 1. A steelmaking whole process target temperature control system is characterized by comprising: The model parameter management module is used for managing model parameters, parameter configuration 2, shelf time, alloy parameters and equipment states; the data preprocessing module is used for preprocessing input data; the temperature drop data processing module is used for evaluating the correct temperature drop coefficient and giving correction; The ladle temperature compensation module is used for compensating the ladle temperature through the ladle hot repair treatment time length; the waiting process temperature drop calculation module multiplies the waiting process temperature drop coefficient and the waiting time to calculate the temperature drop of the waiting process; the converter target temperature calculation module is used for calculating the converter target temperature when receiving a converter starting signal; the converter blowing-stop temperature calculation module is used for calculating the converter blowing-stop temperature; the refining outbound target temperature calculation module is used for calculating refining outbound target temperature calculation according to the ladle temperature drop coefficient, the converter ladle temperature, the refining inbound temperature measurement moment and the converter ladle temperature measurement moment; the final re-refining target temperature calculation module is used for calculating the refining outlet temperature of the final re-refining; The liquidus temperature calculation module is used for searching target components of the corresponding elements through steel types and smelting distinction smeltDiv to calculate liquidus temperature; the tundish target temperature calculation module is used for calculating the target temperature of the tundish molten steel; The ladle target temperature calculation module is used for calculating the ladle molten steel target temperature; the process state display module is used for displaying the Gantt chart, the process state and the system model management interface through a display screen; The historical data query module is used for realizing index management, historical query and heat query; the calculation formula of the converter blowing-stop temperature calculation module is as follows: Converter blowing stop temperature BOF (i)/tmp1=converter ladle temperature LDB/tmp1+total Jin Wenjiang of average same steel grade of nth furnace+total Jin Wenjiang of ladle state compensation of present furnace+average same converter station number of previous M furnace (converter BofAct temperature actual result value-converter ladle temperature actual result value-ladle state compensation-total Jin Wenjiang) The temperature drop M of the same converter station number averaged by the previous M furnace is removed from the maximum value and the minimum value, and two average values are left; if the temperature of the converter BofAct and the temperature of the converter ladle are equal to 0, the data of the heat cannot be used; The range of the same converter station number (converter BofAct temperature-converter ladle temperature-ladle state compensation-summation Jin Wenjiang) of the average of the front M furnaces is 10-40 ℃ or less, 10 is taken when the average of the current M furnaces is less than 10, and 40 is taken when the average of the current M furnaces is greater than 40; if the historical heat is not at BofAct ℃, the piece of data is rejected; if the historical heat does not have the converter ladle temperature, the data are removed, wherein the ladle temperature is less than or equal to 1500 and is judged to be invalid data; The temperature drop in the tapping process and other unknown temperature drops of the converter are treated by the same variable, and the treatment is carried out according to the same converter number; the following constraints are satisfied: Converter ladle temperature LDB (i)/tmp1+BOF process temperature drop minimum BOF (i) _ DropTempMin is less than or equal to converter blowing stop temperature BOF (i)/tmp 1 is less than or equal to converter ladle temperature LDB/tmp (i) +BOF process temperature drop maximum BOF (i) _ DropTempMax If the converter blowing stop temperature BOF (i)/tmp 1 is less than the converter ladle temperature LDB/tmp1+BOF process temperature drop minimum value BOF (i) _ DropTempMin The converter blowing stop temperature BOF (i)/tmp1=converter ladle temperature LDB (i)/tmp1+BOF process temperature drop minimum value BOF (i) _ DropTempMin If the converter blowing stop temperature BOF (i)/tmp 1> converter ladle temperature LDB (i)/tmp1+BOF process temperature drop maximum value BOF (i) _ DropTempMax The converter blowing stop temperature BOF (i)/tmp1=converter ladle temperature LDB (i)/tmp1+bof process temperature decrease maximum BOF (i) _ DropTempMax.
  2. 2. The steelmaking whole process target temperature control system as set forth in claim 1 wherein said model parameter management module comprises a model algorithm management sub-module, a model data management sub-module, and a model data organization management sub-module; The model algorithm management submodule is used for managing mathematical formulas required by calculation of all models, organizing the mathematical formulas according to the principle of the models and taking charge of the calling relation and parameter processing work of the algorithms; The model data management sub-module is used for managing all data needed to be used in all model calculation; The model data organization mode management sub-module is used for managing various data organization modes in the model calculation process.
  3. 3. The steelmaking process as claimed in claim 1, wherein said temperature drop data processing module automatically calibrates said upper and lower limits with historical data of the same refining mode to remove outliers and processes fluctuations with a moving average of a plurality of recent furnaces, and wherein said step of evaluating the correct temperature drop coefficients and giving corrections comprises: The current calculation mode is that the temperature drop speed is 1 Searching the temperature drop speed in the last using period by using the same ladle number; If the packet is a small repair packet or a large repair packet, using a default value; if the packet is a normal packet, (a) the calculated temperature drop speed 1, (b) the total temperature drop/total duration; If it is a new packet, default values are used.
  4. 4. The steel-making overall process target temperature control system according to claim 1, wherein the ladle temperature compensation module identifies ladle hot repair treatment duration LdFixTime according to ladle number, and LdFixTime is obtained by subtracting the current heat tapping start time from the last heat pouring end time; (1)0h<LdFixTime≤0.5h Normal pack, temperature compensation value is 5 ℃; (2)0.5h<LdFixTime≤5h normal package, calculating by using a logarithmic function; y=10+2.5*log(LdFixTime-0.5) (3)5h<LdFixTime≤8h The small repair bag is 15 ℃ and marked as small repair bag, and the temperature is additionally increased by +3 ℃ within the normal temperature drop range during the second use; (4)8h<LdFixTime the overhaul package is 20 ℃ and marked as an overhaul package, and the temperature is additionally increased by +5 ℃ within the range of normal temperature drop during the second use.
  5. 5. The steel-making overall process target temperature control system according to claim 1, wherein the calculation formula of the refining-out target temperature calculation module is as follows: Tdecline1 =(ldTemp - (Sr1)InTemp)/((Sr1)InTempTime -ldTempTime) Wherein Tdecline denotes a ladle temperature drop coefficient 1, ldTemp denotes a converter ladle temperature, (Sr 1) InTemp denotes a refining approach temperature, (Sr 1) INTEMPTIME denotes a refining approach temperature measurement time, and LDTEMPTIME denotes a converter ladle temperature measurement time; if: ladle temperature drop rate temperature drop of limit tdecline min less than or equal to temperature drop the coefficient 1 is less than or equal to the upper limit tdecline max of the ladle temperature drop speed Is effective data and stores a history table of the data; if the ladle temperature drop coefficient is 1 < the ladle temperature drop speed lower limit tdecline min Then, the ladle temperature drop coefficient 1=the ladle temperature drop speed lower limit tdecline min, and the data does not have a history table; if the ladle temperature drop coefficient 1> the ladle temperature drop speed upper limit tdecline max Then, the ladle temperature drop coefficient 1=the upper limit tdecline max of the ladle temperature drop speed, and the data does not have a history table; The judgment of the arrival temperature satisfies the following conditions: the starting time of Sr1 refining treatment is +60 seconds < Sr1 refining arrival temperature measurement time < Sr1 steel ladle arrival time Judging as effective inbound temperature; otherwise, judging the invalid incoming temperature, and not storing the history table.
  6. 6. The steel-making overall process target temperature control system according to claim 1, wherein the calculation formula of the last refining target temperature calculation module is as follows: Final refining outlet temperature/tmp1=ladle molten steel target temperature LDC/tmp1+waiting process 2 duration of this heat continuous casting Wen Jiangsu 1+average of the last 3 heats of the same casting machine number (tundish target temperature-tundish temperature actual result value).
  7. 7. The steel-making overall process target temperature control system according to claim 1, wherein the liquidus temperature calculation module comprises the following calculation steps: Searching target components of each corresponding element through steel grade and smelting distinction smeltDiv, and calculating liquidus temperature; if continuous casting composition C <0.5: T= 1538 - [55*(%C)+12*(%Si)+4.6*(%Mn)+30*(%P)+30*(%S)+4.3*(%Ni)+1.5*(%Cr)] -88*(%C)*(%C) if 0.5≤C < 1.0: T= 1538 - [55*(%C)+12.5*(%Si)+4.7*(%Mn)+30*(%P)+30*(%S)+4.3*(%Ni)+1.5*(%Cr)] -(44+52*(%C)*(%C)) if C is greater than or equal to 1.0: T= 1538 - [55*(%C)+13*(%Si)+4.8*(%Mn)+30*(%P)+30*(%S)+4.3*(%Ni)+1.5*(%Cr)] Wherein T represents liquidus temperature,% C represents C content in molten steel,% Si represents Si content in molten steel,% Mn represents Mn content in molten steel,% P represents P content in molten steel,% S represents S content in molten steel,% Ni represents Ni content in molten steel, and% Cr represents Cr content in molten steel.
  8. 8. The steel-making overall process target temperature control system according to claim 1, wherein the calculation formula of the tundish target temperature calculation module is as follows: Ladle molten steel target temperature CC (i)/tmp1=liquidus temperature+superheat degree of parameter 1+other correction value of continuous casting If it is the first furnace that is poured, castDivNo =1 Casting first furnace temperature compensation for continuous casting other correction value = parameter 2 If it is quick change tdChgFlg =1 Continuous casting other correction value = fast-change temperature compensation of parameter 2.
  9. 9. The steel-making overall process target temperature control system according to claim 1, wherein the calculation steps of the ladle target temperature calculation module are as follows: ladle molten steel target temperature LDC/tmp1=ladle molten steel target temperature CC (i)/tmp1+ calculated casting duration × continuous casting temperature drop coefficient 2 In tapping plans, there are corresponding fields: calculated casting duration = planned casting end time-planned casting start time of the present furnace The pouring time is self-corrected, namely the planned pouring time and actual pouring time of the pouring time are compared: if two continuous furnaces are used, the planned casting duration-actual casting duration is more than 7 minutes Or two continuous furnaces, namely planning casting time length-actual result casting time length < -7 minutes Then the historical value of actual result pouring duration is calculated for other furnace times under the pouring time; calculating the casting duration of the same casting number: pouring duration = 0.6 x actual pouring duration of the kth furnace +0.4 x actual pouring duration of the (K-1) th furnace.

Description

Target temperature control system for whole steelmaking process Technical Field The invention belongs to the field of target temperature control, and relates to a target temperature control system for the whole steelmaking process. Background The temperature of molten steel in the steelmaking process is an important link for controlling the whole steelmaking process. The temperature of the whole steelmaking process is influenced by steelmaking plan, ladle lifting information, equipment state, processing time of each working procedure, transportation time, adding amount of alloy auxiliary materials and the like. In the steelmaking process, the unreasonable temperature control of any one of the process links can bring adverse effects to the next process and steelmaking rhythm. In order to eliminate the adverse effects and ensure smooth steelmaking rhythm, the traditional method is to establish a control model of each single-station process, and control the temperature of molten steel entering and exiting from the single-station process, so as to provide molten steel with target temperature for the next process. The single-station process control model can achieve the aim of connecting the temperatures of the previous process and the next process, but compared with the temperature control of the whole steelmaking process, the energy consumption of smelting production is higher, especially in increasingly strong steel production competition, the steel tapping temperature of molten steel is high, and the temperature rising/heat preservation treatment of the refining process is frequent, so that the cost per ton of steel is higher. Disclosure of Invention In view of the above, the invention aims to provide a target temperature control system for the whole steelmaking process, which realizes decision support for target temperature control of each steelmaking process, effectively reduces tapping temperature of a converter, reduces heating/heat preservation treatment of a refining process, and saves energy consumption of smelting production. In order to achieve the above purpose, the present invention provides the following technical solutions: the invention provides a steelmaking whole process target temperature control system, which comprises: The model parameter management module is used for managing model parameters, parameter configuration 2, shelf time, alloy parameters and equipment states; the data preprocessing module is used for preprocessing input data; the temperature drop data processing module is used for evaluating the correct temperature drop coefficient and giving correction; The ladle temperature compensation module is used for compensating the ladle temperature through the ladle hot repair treatment time length; the waiting process temperature drop calculation module multiplies the waiting process temperature drop coefficient and the waiting time to calculate the temperature drop of the waiting process; the converter target temperature calculation module is used for calculating the converter target temperature when receiving a converter starting signal; the converter blowing-stop temperature calculation module is used for calculating the converter blowing-stop temperature; the refining outbound target temperature calculation module is used for calculating refining outbound target temperature calculation according to the ladle temperature drop coefficient, the converter ladle temperature, the refining inbound temperature measurement moment and the converter ladle temperature measurement moment; the final re-refining target temperature calculation module is used for calculating the refining outlet temperature of the final re-refining; The liquidus temperature calculation module is used for searching target components of the corresponding elements through steel types and smelting distinction smeltDiv to calculate liquidus temperature; the tundish target temperature calculation module is used for calculating the target temperature of the tundish molten steel; The ladle target temperature calculation module is used for calculating the ladle molten steel target temperature; the process state display module is used for displaying the Gantt chart, the process state and the system model management interface through a display screen; The historical data query module is used for realizing index management, historical query and heat query; Further, the model parameter management module comprises a model algorithm management sub-module, a model data management sub-module and a model data organization mode management sub-module; The model algorithm management submodule is used for managing mathematical formulas required by calculation of all models, organizing the mathematical formulas according to the principle of the models and taking charge of the calling relation and parameter processing work of the algorithms; The model data management sub-module is used for managing all data needed to be used in all model