CN102059333A - Advanced secondary cooling water control system of billet continuous casting machine - Google Patents
Advanced secondary cooling water control system of billet continuous casting machine Download PDFInfo
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Abstract
The invention discloses an advanced secondary cooling water control system of a billet continuous casting machine, which is a feedforward secondary cooling water control system based on the continuous temperature measurement in tundish. The control system is a casting speed and superheat-degree feedforward open-loop control system, and comprises a casting temperature liquidus temperature module and a casting speed correlation coefficient module, wherein the casting temperature liquidus temperature module is connected with the input end of a comparer by a correlation coefficient module, and the casting speed correlation coefficient module is connected with the input end of the comparer by a secondary cooling water model module. The comparer takes the differences between the casting temperature compensation water quantity and the supplementary water quantity obtained by the effective casting speed calculation, and the practical flow value obtained from the field flow detection as the input of a PID (Proportional Plus Integral Plus Derivative Controller) controller; the output of the PID controller controls the opening degree of a field regulating valve to regulate the field secondary cooling area water flow and finally to ensure the ejection temperature within the preset range of the process. The invention can prevent the surface temperature of a cast blank from generating overlarge fluctuation, and can dynamically calculate each section water quantity of the secondary cooling so as to create conditions for the stability, the smooth running, the high yield and the low consumption of the billet continuous casting machine.
Description
Technical field
The present invention relates to blast furnace automatic control technology field, particularly relate to a kind of billet caster two cold water distribution advanced control systems.Relate generally to accurate, the stable control of billet caster two cold water distribution system Zhong Ge district water distribution quantities, eliminate the influence of pouring temperature variation slab quality.
Background technology
Metallurgical industry is one of mainstay of the national economy industry, and continuous casting is the important step of its production procedure.The structure of currently used continuous casting installation for casting is as shown in Figure 1: comprise ladle 1, continuous measurement of molten steel temperature device 2, submersed nozzle 3, tundish 4, crystallizer 5, meniscus 6, backing roll 7, liquid phase 8, secondary cooling zone 9, solidified shell 10, metallurgical length 11, flame cut point 12, strand 13, molten steel 14.
The continuous-cast blank quality is the emphasis problem that people pay close attention to always, and the continuous casting two cold water distribution is to influence one of principal element of continuous casting billet internal soundness, therefore sets up reliable two cold water allocation model, and adopting advanced control strategy is the key that improves the continuous casting billet internal soundness.The present continuous casting two cold water distribution control system pulling rate control modes of being correlated with that adopt more.Because pulling rate is a deciding factor that influences two cold-zone water distribution quantities, therefore when casting conditional stability (molten steel temperature in tundish is in stable state), consider to adopt preposition control system for the control of each chilled(cooling) water return (CWR), two cold-zones, the water yield of each chilled(cooling) water return (CWR), two cold-zones is changed continuously with the variation of pulling rate.This kind method is based on the off-line Mathematical Modeling, according to data inducing classification such as the technological parameter of qualified strand and steel grade, section, pulling rate and cooling water inflow repeatedly in the production reality, and in conjunction with certain Research on Mathematical, determine the relation of the pulling rate and the two cold water distribution water yields, and store in the computer with the form of water distribution table, after this finish two cold water distribution quantities according to the relation of setting with the variation of pulling rate and regulate automatically by programmable controller PLC.In fact this mode is made up of following two kinds of methods:
Proportion control: adopt specific water's method, i.e. basis
(
Which district of=1,2,3,4 expressions,
Be
District's water yield,
Be pulling rate,
Be
The coefficient that the district is corresponding, after herewith) determine respectively to distinguish the cooling section water yield;
Parameter control:, press according to steel grade
Carry out water distribution.Pre-set
The water distribution parameter in district
, when pulling rate changed, each was distinguished two cold water distribution quantities and changes thereupon.
Above-mentioned two kinds of methods, it is consistent with the variation of two cold water distribution quantities that the PLC control system can remain pulling rate.
Above-mentioned two cold water distribution PLC control systems are only relevant with the water yield and pulling rate, do not have the feedback of slab quality, thereby belong to open-loop control system.Because model obtains based on the target water yield according to the given water yield of pulling rate calculated off-line gained, can guarantee that casting blank surface temperature and target temperature meet preferably under the different casting, thereby casting cycle is under the less prerequisite of other disturbance factor effects, adopt this method that each loop water yield is controlled and to guarantee that strand obtains near the less surface temperature distribution of fluctuation target temperature, thereby help improving slab quality.But there is tangible weak point in this control mode: relatively poor to the adaptability to changes that working condition changes, can only be applicable to the metastable situation of pouring temperature and pulling rate, promptly when pulling rate sharply changes, the water yield also sharply changes thereupon, cause the remarkable fluctuation of casting blank surface temperature, cause the strand inhomogeneous cooling even; And not being suitable for the unsettled situation of casting condition, supply water cooling and nozzle operation situation of, crystallizer big as the molten steel temperature in tundish fluctuation is undesired etc.Because strand is in the process of two cold-zones, and surface temperature can't directly record, therefore can't set up cooling control system simultaneously based on the surface temperature feedback, also can't the design temperature closed loop controller.
Under the constant prerequisite of pulling rate, when bigger fluctuation appears in cast temperature, the fluctuation of the degree of superheat (being the poor of pouring temperature and liquidus temperature) makes pulling rate and secondary cooling water amount and actual production require not match, and has caused the increase of strand breakout ratio, has influenced the inside and outside quality of strand.Because cast temperature is (the middle Baogang water continuous temperature measurement) that can measure, it is measured as the control water distribution, improves an important detection index of the rate of watering into, the hot state and the temperature drop rule of bag in not only can monitoring, and the secondary cooling water of bag temperature correlation is controlled in can participating in, and improves slab quality.Therefore can handle the continuous casting molten steel temperature in tundish as a main disturbance factor that influences in the strand production process.Therefore in casting cycle, the design of the optimal control system of pulling rate, the degree of superheat and the water yield seems particularly important, needs to introduce pulling rate and degree of superheat control.
Summary of the invention
Technical problem to be solved by this invention is: fluctuate to the problem of two cold water distribution quantities influences at casting speed and middle Baogang coolant-temperature gage, a kind of billet caster two cold water distribution advanced control systems are provided, thereby create conditions for billet caster stable smooth operation high yield and low cost.
The present invention solves its technical problem and adopts following technical scheme:
Billet caster two cold water distribution advanced control systems provided by the invention, be a kind of feedforward two cold water distribution control systems based on middle bag continuous temperature measurement, this system is the open-loop control system of a pulling rate, degree of superheat feedforward, the structure of this system is: be provided with pouring temperature liquidus temperature module, it links to each other with comparator input terminal by the coefficient correlation module; Be provided with pulling rate coefficient correlation module, it links to each other with comparator input terminal by two cold water allocation model modules; This comparator compensates pouring temperature for the water yield and the difference of the actual flow value that the rate of water make-up that calculated by effective pulling rate and on-the-spot flow detection obtain as the input of PID controller; The aperture of the output control Field adjustment valve of PID controller to regulate on-the-spot two cold-zone discharges, guarantees that finally the ejection temperature is in the scope of technique initialization.
Described pouring temperature liquidus temperature module is a liquidus temperature of determining cast, and relevant with the steel grade of on-the-spot casting machine equipment and generation.
Described coefficient correlation module is the data process linear regression processing that obtains according to observation, and offline optimization obtains the water distribution parameter and sets.
Described two cold water allocation model modules are to set up according to the water distribution parameter that technology provides.
The present invention is provided with the flow detection module, and it is used to detect the actual amount of water of on-the-spot two cold-zones, and detected actual amount of water is fed back to comparator.
Said system provided by the invention, it is in the application of the control that realizes billet caster two cold water distribution processes.
When native system is used, earlier calculate the needed water yield in two cold-zones through two cold water allocation model modules by effective pulling rate, obtain the rate of water make-up that the variation owing to pouring temperature causes by pouring temperature liquidus temperature module and coefficient correlation module again, the detected two cold-zone actual amount of water of both sums and flow detection module compare, the deviation that obtains is through the effect of PID controller, the aperture of control Field adjustment valve, and then regulate the two cold-zone water yields, finally regulate the ejection temperature; Surpassed certain scope as long as calculate the deviation that the water yield and actual detected obtain the water yield, this process will be carried out repeatedly, and in certain scope, adjustment process finishes up to deviation.
The present invention compared with prior art has following main beneficial effect:
One. great fluctuation process appearred in order to prevent casting blank surface temperature, the method that is chosen at the effective pulling rate of employing in the suitable time interval for this parameter of pulling rate is handled, and when the fluctuation of pulling rate surpasses given range, change the given water yield again, a suitable delay is arranged thereby make between the variation of the variation of the cooling circuit water yield and pulling rate.
They are two years old. and the bigger situation that fluctuates may occur at pouring temperature, as feed-forward signal, realize the correction to the given water yield in two Leng Ge districts with the degree of superheat, dynamic calculation goes out two cold each section water yields.Make system set value the fluctuation that compensates the pulling rate and the degree of superheat by changing the water yield rapidly, thereby overcome the deficiency of traditional cooling water inflow-pulling rate establishing method.
Table 2 has been listed section and has been of a size of the target water yield under the different degrees of superheat under the condition that 150mmX150mm mild steel is 2.0m/min at pulling rate.As can be seen from Table 2, along with the increase of the degree of superheat, the target water yield of each section all increases to some extent.This part water yield will be eliminated because pouring temperature changes institute and cause the strand variations in temperature, and wherein liquidus temperature is 1520 ℃.
Description of drawings
Fig. 1 is the simple and easy product process figure of present billet caster.
Fig. 2 is the feedforward two cold water distribution control system block diagrams of bag continuous temperature measurement in the present invention is based on.
Fig. 3 is an impulse form.
Among the figure: 1. ladle; 2. continuous measurement of molten steel temperature device; 3. submersed nozzle; 4. tundish; 5. crystallizer; 6. meniscus; 7. backing roll; 8. liquid phase; 9. secondary cooling zone; 10. solidified shell; 11. metallurgical length; 12. flame cut point; 13. strand; 14. molten steel.
The specific embodiment
The invention will be further described below in conjunction with embodiment and accompanying drawing.
It is generally acknowledged that the casting speed and the two cold water distribution water yields have certain functional relation, in the actual motion, we find because the fluctuation of on-the-spot liquid steel temperature is big, tundish temperature temperature drop in casting process reaches casting speed greatly situations such as interference are arranged.Therefore, for the relation of considering casting speed and middle Baogang coolant-temperature gage and the two cold water distribution water yields simultaneously, be difficult to obtain precise math model, and control poor effect with traditional pid control mode.
At above problem, we sum up on-the-spot practical operating experiences, improve from following two aspects and control:
1. in order to prevent that great fluctuation process from appearring in casting blank surface temperature, the method that should be chosen at the effective pulling rate of employing in the suitable time interval for this parameter of pulling rate is handled, and when the fluctuation of pulling rate surpasses given range, change the given water yield again, a suitable delay is arranged thereby guarantee to make between the variation of the variation of the cooling circuit water yield and pulling rate;
2. the bigger situation that fluctuates may occur at pouring temperature, as feed-forward signal, realize the correction to the given water yield in two Leng Ge districts with middle Baogang coolant-temperature gage (or degree of superheat), dynamic calculation goes out two cold each section water yields.
Figure 2 shows that feedforward two cold water distribution control system block diagrams based on middle bag continuous temperature measurement, wherein two cold water allocation model parameters are obtained by the heat transfer model calculated off-line, these parameters are deposited in the computer level two owing to steel grade, section and pulling rate condition is different and different.The control model is with the preposition basis that is controlled to be under the standard cast temperature conditions, obtain the degree of superheat about the strand of different steel grades and cross dimensions correction factor by the casting blank solidification mathematical Model of Heat Transfer to each chilled(cooling) water return (CWR), with middle Baogang coolant-temperature gage (or degree of superheat) as feed-forward signal, realization is to the correction of each given water yield in loop, and dynamic calculation goes out two cold each section water yields.This control mode has solved middle Baogang coolant-temperature gage and has fluctuateed big and problem that cause by preposition feed-forward mode.
Billet caster two cold water distribution advanced control systems provided by the invention, be a kind of feedforward two cold water distribution control systems based on middle bag continuous temperature measurement, this system treats the variation of the pulling rate fluctuation and the degree of superheat as a kind of disturbance of surveying, can be eliminated by the mode of feedforward.This system is the open-loop control system of a pulling rate, degree of superheat feedforward in essence; And obtain degree of superheat penalty coefficient by piecewise linear regression, strengthened the response speed of water distribution quantity to a certain extent to pulling rate and degree of superheat variation, make system set value the fluctuation that compensates the pulling rate and the degree of superheat by changing the water yield rapidly, overcome the deficiency of traditional cooling water inflow-pulling rate establishing method.
Described feedforward two cold water distribution control systems based on middle bag continuous temperature measurement, this system are as shown in Figure 2: be provided with pouring temperature liquidus temperature module, it links to each other with comparator input terminal by the coefficient correlation module; Be provided with pulling rate coefficient correlation module, it links to each other with comparator input terminal by two cold water allocation model modules; By the pouring temperature compensation water yield and effectively the difference of the actual flow value that obtains of the water yield that calculates of pulling rate and on-the-spot flow detection as the input of PID controller; The aperture of the output control Field adjustment valve of PID controller to regulate on-the-spot two cold-zone discharges, guarantees that finally the ejection temperature is in certain normal scope.
Described pouring temperature liquidus temperature module, its effect are to determine the liquidus temperature of cast, and be general relevant with the steel grade of on-the-spot casting machine equipment and generation.
Described coefficient correlation module is the data process linear regression processing that obtains according to observation, and offline optimization obtains the water distribution parameter.
Described comparator, its effect are the compensation water yields that pouring temperature is obtained and are compared by rate of water make-up and the detected actual amount of water of on-the-spot flow that effective pulling rate calculates.
Described pulling rate coefficient correlation module, its effect are the pulling rate that detection obtains to be carried out validation handle, and obtain effective pulling rate.
Described two cold water allocation model modules are must set up according to the water distribution parameter that the technology specialty provides.
Described PID controller, its effect are that The whole control system is carried out bias adjustment, thereby make the actual value of two cold-zones institute water requirement consistent with the predetermined value of technological requirement.
Described control valve, its effect are that the on-the-spot two cold-zone water yields are directly regulated.
Described Flow-rate adjustment object module is the water yield that is conditioned according to the technological requirement setting.
Described temperature adjusting object module is to be conditioned the ejection temperature according to what technological requirement was set.
Described flow detection module, its effect are to detect on-the-spot two cold-zone actual amount of water, and feed back to comparator.
Feedforward two cold water distribution control systems based on middle bag continuous temperature measurement provided by the invention, its course of work is: calculate the needed water yield in two cold-zones by effective pulling rate through two cold water allocation model earlier, obtain the rate of water make-up that the variation owing to pouring temperature causes by cast liquidus temperature and coefficient correlation again, both sums compare with the on-the-spot two cold-zone actual amount of water that obtain that detect, the deviation that obtains is through the effect of PID controller, the aperture of control Field adjustment valve, and then regulate the two cold-zone water yields, finally regulate the ejection temperature; Surpassed certain scope as long as calculate the deviation that the water yield and actual detected obtain the water yield, this process is just carried out repeatedly, and in certain scope, adjustment process finishes up to deviation, and it is dynamic stable that system keeps.
Billet caster two cold water distribution advanced control systems provided by the invention can be made contributions for realizing billet caster two cold water distribution advanced control methods.
Below billet caster two cold water distribution advanced control methods are introduced.
1. effective pulling rate model:
Effective pulling rate method: under nominal situation, then think and fluctuation occurs, produce a pulsewidth constantly at this and be when the pulling rate amplitude of variation surpasses certain numerical value (scene is set at 0.lm/min)
, amplitude is
Pulse signal.Pulling rate reduces corresponding positive pulse, and pulling rate increases corresponding negative pulse.As Fig. 3, a perturbation process of pulling rate (recover initial value or arrive another stationary value from beginning to change to) will produce a pair of positive negative pulse stuffing.
A first order inertial loop is passed through in this pulse:
The impulse response output that is produced
With actual pulling rate
And as effective pulling rate value
, that is:
Wherein
Be time constant, the speed of its decision charge and discharge process.
Big more, the time of transient process is long more; Otherwise the time of transient process is short more.S is a first order inertial loop.
Be generally and obtained the higher impulse response of approximation quality, requirement
, corresponding first-order system impulse response function is:
In the formula,
Be pulsewidth,
Be amplitude,
It is time constant.
Analysis above comprehensive, the definite of parameter must follow following several principles:
(1)
, be the pulling rate amplitude of variation;
（2）
；
（3）
。
By observing historical data, after multi-group data is tested, determined one group of optimum parameters value as shown in table 1.
Adopt the described effective pulling rate mode of this example when effectively eliminating the spike fluctuation, for such perturbation process, except variations in temperature is more tended to be steady, also reduced the amplitude of casting blank surface temperature fluctuation greatly, promptly carry out water distribution calculating by effective pulling rate and can compensate the casting blank surface temperature unusual fluctuations that cause owing to the pulling rate disturbance largely, two cold-zone each section variation of temperature amplitudes are reduced in various degree.
2. based on the feed forward control method of middle bag continuous temperature measurement:
When one timing of continuous casting working condition, pulling rate has decisive influence to process of setting, and high pulling rate means high production rate, and has increased the danger of bleedout simultaneously.Take into account output and security simultaneously so guarantee slab quality, change the real-time water yield that must change according to pulling rate and become the main contents that the water yield is controlled.In addition, for the different degrees of superheat, the in good time adjustment of the water yield also is different, and this just needs to consider that the degree of superheat changes the influence to water distribution quantity.Based on above analysis, the solidification and heat transfer Mathematical Modeling that technique for applying is set up is constraint with metallurgical criteria and target temperature profiles, and off-line is set up the relation between optimum water distribution quantity and the pulling rate and the degree of superheat, obtains the optimal compensation coefficient by piecewise linear regression.Bag wall heat absorption in considering simultaneously to open when watering, open water a period of time after, work present situation according to the fall off rate and the middle bag continuous temperature measurement device of liquid steel temperature, be defined in open water a period of time after, the fall off rate of liquid steel temperature is lower than a certain value, and the continuous temperature measurement value just can be introduced control system with the degree of superheat more than the liquidus temperature that the cast steel grade requires.
The cooling water inflow set-point of corresponding control loop is calculated as follows:
Total water distribution quantity:
The real-time water yield that calculates according to effective pulling rate:
Pouring temperature changes the required compensation water yield of caused strand temperature:
In the formula,
Be molten steel overheat, promptly
,
Be pouring temperature,
Be liquidus temperature;
For offline optimization obtain
The water distribution parameter in district;
,
Be penalty coefficient;
Be two cold-zone numbers;
Be the linear regression segments;
Be middle bag temperature fall off rate,
Be respectively
Corresponding constantly middle bag temperature.
Wherein the scope of linear regression segments, molten steel overheat reaches
Mainly be to determine according to the quality requirement of strand and the steel grade of casting.
Among Fig. 2, in order to make this figure succinct, saved " module " literal, for example: " pouring temperature liquidus temperature module " only write as " pouring temperature liquidus temperature ".
Subordinate list
Parameter after table 1 is optimized
Amplitude of variation (
 |
0.1~0.2 | 0.2~0.3 | >0.3 |
 |
34 | 37 | 40 |
 |
0.3 | 0.3 | 0.3 |
Respectively distinguish discharge (L/min) before and after the advanced control strategy input of table 2
| The cooling zone | 0 (degree of superheat/℃) | The 30(degree of superheat/℃) | The 50(degree of superheat/℃) |
| One district | 189.54 | 190.65 | 190.94 |
| Two districts | 252.72 | 253.67 | 254.23 |
| Three districts | 126.36 | 126.86 | 127.45 |
| Four districts | 63.18 | 63.87 | 64.36 |
Claims (7)
1. billet caster two cold water distribution advanced control systems, it is characterized in that a kind of feedforward two cold water distribution control systems based on middle bag continuous temperature measurement, this system is the open-loop control system of a pulling rate, degree of superheat feedforward, the structure of this system is: be provided with pouring temperature liquidus temperature module, it links to each other with comparator input terminal by the coefficient correlation module; Be provided with pulling rate coefficient correlation module, it links to each other with comparator input terminal by two cold water allocation model modules; This comparator compensates pouring temperature for the water yield and the difference of the actual flow value that the rate of water make-up that calculated by effective pulling rate and on-the-spot flow detection obtain as the input of PID controller; The aperture of the output control Field adjustment valve of PID controller to regulate on-the-spot two cold-zone discharges, guarantees that finally the ejection temperature is in the scope that the technology specialty is set.
2. billet caster two cold water distribution advanced control systems according to claim 1 is characterized in that described pouring temperature liquidus temperature module, are the liquidus temperatures of determining cast, and relevant with the steel grade of on-the-spot casting machine equipment and generation.
3. billet caster two cold water distribution advanced control systems according to claim 1 is characterized in that described coefficient correlation module, are the data process linear regression processing that obtains according to observation, and offline optimization obtains the water distribution parameter and sets.
4. billet caster two cold water distribution advanced control systems according to claim 1 is characterized in that described two cold water allocation model modules are to set up according to the water distribution parameter that technology provides.
5. billet caster two cold water distribution advanced control systems according to claim 1 is characterized in that being provided with the flow detection module, and it detects the actual amount of water of on-the-spot two cold-zones, and detected actual amount of water is fed back to comparator.
6. the purposes of the described system of arbitrary claim in the claim 1 to 5 is characterized in that the application in the control that realizes billet caster two cold water distribution processes.
7. purposes according to claim 6, it is characterized in that: calculate the needed water yield in two cold-zones by effective pulling rate through two cold water allocation model modules earlier, obtain the rate of water make-up that the variation owing to pouring temperature causes by pouring temperature liquidus temperature module and coefficient correlation module again, the detected two cold-zone actual amount of water of both sums and flow detection module compare, the deviation that obtains is through the effect of PID controller, the aperture of control Field adjustment valve, and then regulate the two cold-zone water yields, finally regulate the ejection temperature; Surpassed certain scope as long as calculate the deviation that the water yield and actual detected obtain the water yield, this process will be carried out repeatedly, and in certain scope, adjustment process finishes up to deviation.
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| CN102756105A (en) * | 2012-06-28 | 2012-10-31 | 中冶连铸技术工程股份有限公司 | Method for realizing online dynamic water distribution in accordance with solidification process of casting blank |
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| CN103008597A (en) * | 2012-12-31 | 2013-04-03 | 内蒙古包钢钢联股份有限公司 | System and method for automatically controlling second cooling of continuous casting |
| CN103071774A (en) * | 2013-01-24 | 2013-05-01 | 北京科技大学 | Method for controlling surface temperature of casting blank at straightening point of continuous casting machine |
| CN103071774B (en) * | 2013-01-24 | 2014-07-23 | 北京科技大学 | Method for controlling surface temperature of casting blank at straightening point of continuous casting machine |
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| CN104084553B (en) * | 2014-07-24 | 2016-06-22 | 山西太钢不锈钢股份有限公司 | Continuous cast mold soft water automatic regulating system |
| CN105867123A (en) * | 2016-04-05 | 2016-08-17 | 上海十三冶建设有限公司 | PID parameter searching optimization control method for continuous casting secondary cooling water distribution |
| CN105964968A (en) * | 2016-05-23 | 2016-09-28 | 中冶赛迪工程技术股份有限公司 | Method for increasing secondary cooling water distribution quantity at low drawing speed |
| CN106825479A (en) * | 2017-03-23 | 2017-06-13 | 东北大学 | A kind of determination method of hot delivering technology of CC billets process quenching technology for surfaces cooling water flow |
| CN107052291A (en) * | 2017-04-21 | 2017-08-18 | 抚顺新钢铁有限责任公司 | A kind of continuous casting secondary cooling water dynamic water allocation system and technique |
| CN111633193A (en) * | 2020-04-29 | 2020-09-08 | 邢台钢铁有限责任公司 | Continuous casting method for martensite air valve steel small square billet |
| CN111992685A (en) * | 2020-08-10 | 2020-11-27 | 湖南华菱涟源钢铁有限公司 | Method for reducing edge-rot defects of steel coil of Q355B in thin slab continuous casting and rolling production line |
| CN113290222A (en) * | 2021-05-31 | 2021-08-24 | 江西理工大学 | Automatic control method and system for temperature of inner cavity of vacuum horizontal continuous casting crystallizer |
| CN113290222B (en) * | 2021-05-31 | 2022-04-15 | 江西理工大学 | Automatic control method and system for temperature of inner cavity of vacuum horizontal continuous casting crystallizer |
| CN114130980A (en) * | 2021-10-29 | 2022-03-04 | 中冶南方连铸技术工程有限责任公司 | Continuous casting dynamic secondary cooling control method |
| CN114130980B (en) * | 2021-10-29 | 2023-06-20 | 中冶南方连铸技术工程有限责任公司 | Dynamic secondary cooling control method for continuous casting |
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