CN102228969A - System for multi-point continuous measurement and simulation of solidification and heat transfer progress of molten steel in continuous casting crystallizer - Google Patents
System for multi-point continuous measurement and simulation of solidification and heat transfer progress of molten steel in continuous casting crystallizer Download PDFInfo
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Abstract
The invention discloses a system for multi-point continuous measurement and simulation of a heat transfer progress of solidification of molten steel in a continuous casting crystallizer. The system is composed of a mould data initializing module, a data operating module and a result outputting module, wherein the mould data initializing module is provided with an interface which is connected with the input end of the data operating module; the result outputting module is provided with an interface which is connected with the output end of the data operating module; the mould data initializing module imports a copper plate-cooling temperature of the crystallizer which is monitored by a thermoelectric couple, and geometric parameters at the copper plate-cooling temperature of the crystallizer into the data operating module, and confirms data input; the data operating module processes the temperature and the geometric parameters and then obtains the solidification and heat transfer progress of the molten steel; and next, the result output module outputs the solidification and heat transfer progress of the molten steel. The system disclosed by the invention is simple and convenient, easily operable, high in applicability and high in reliability, and can be applied to on-line multi-point continuous measurement of the solidification and heat transfer progress of the molten steel in the crystallizer of a slab continuous casting machine, thus providing a convenient way for the adjustment of continuous casting production technique in large-scale production.
Description
Technical field
The present invention relates to the continuous casting technology field, the system of the solidification and heat transfer process of high-temperature molten steel in the especially online multiple spot continuous measurement simulation continuous cast mold.
Background technology
As the heart of continuous casting, the casting process in the crystallizer is that heat transfer in an association, solidifies, and flows and the complex process of phenomenon such as solute reallocation.Interrelated between each phenomenon, the reciprocal effect effect makes the heat transfer behavior in the crystallizer become complicated unusually.But the diabatic process of molten steel has very significant effects to slab quality in the crystallizer.Rate of heat transfer is inhomogeneous to be easy to cause the strand crackle; In addition,, then cause thin base shell bulge easily if it is insufficient to conduct heat, distortion, even by bleedout.The behavior of solidifying of strand depends on that molten steel outwards carries out the ability that heat is transmitted.By the solidification and heat transfer process in the crystallizer is carried out simulation calculation, promptly can know the thickness of solidified slab shell in secondary that strand is grown and obtained in crystallizer, casting blank surface temperature distributes, important metallurgical parameters such as crystallizer cooling water inflow, cooling range and conical degree of crystallizer distribution.This all has crucial meaning to improvement of whole casting process parameters Optimization and slab quality etc.
In the solidification and heat transfer process study of molten steel, mainly be to calculate the metallurgical parameter relevant in the continuous cast mold, and then instruct and produce with the casting machine crystallizer by the off-line simulation mode.This wherein is to utilize the crystallizer conductive heat flow to distribute to analyze the process of setting of molten steel basically, obtains the parameter relevant with continuous casting production, and has all obtained certain actual effect.But the means of this off-line simulation often can't be tackled the emergency situations that may occur in actual production.Bear high-temperature molten steel such as the continuous cast mold that is in the elevated temperature heat load, solidifying all multifactor influences such as strand, solid-liquid slag, mold oscillation, cooling water, causing the solidification and heat transfer instability easily, be unfavorable for continuous production.Therefore, need and a kind ofly can measure the copper plate of crystallizer variations in temperature by the mode of measuring in real time, the solidification and heat transfer process of monitoring molten steel is adjusted the continuous casting operating procedure, avoids damp production that emergency case causes and the loss that brings thus.
For this reason, the temperature profile data that we obtain with the monitoring in real time of thermocouple on the crystallizer copper plate of plate blank continuous casting machine is as the basis, utilize convert heat flow density in the crystallizer of different casting machine parameters, steel grade data parameters and processing parameter, simulate the solidification and heat transfer process of high-temperature molten steel in the whole crystallizer.This system is simple and easy to do, applicability is high, reliability is high, can simulate the solidification and heat transfer process of molten steel in the slab caster mould by real-time online, and in large-scale production, the continuous adjustment and the improvement of continuous casting manufacturing technique provide convenient way.
Summary of the invention
Technical problem to be solved by this invention is: the system that solidification of molten steel diabatic process in a kind of multiple spot continuous measurement simulation continuous cast mold is provided, this system is used for solidification of molten steel diabatic process in the online multiple spot continuous measurement slab caster mould, so that provide convenient way for the adjustment that realizes continuous casting manufacturing technique in the large-scale production.
The present invention solves its technical problem and adopts following technical scheme:
The system of solidification of molten steel diabatic process in the multiple spot continuous measurement simulation continuous cast mold provided by the invention, by model data initialization module, data run module and as a result output module three parts form, wherein: the model data initialization module sets up interface to link to each other with the input of data run module; Output module sets up interface to link to each other with the output of data run module as a result; The crystallizer cooled copper temperature that the model data initialization module obtains thermocouple monitoring, and the geometric parameter at this crystallizer cooled copper temperature place imports in the data run module, and affirmation data input, after the data run resume module, obtain described solidification of molten steel diabatic process, then by output module output as a result.
Described model data initialization module is provided with the conticaster database, physical parameter database and production technology database.
Described data run module is made up of one dimension computation model and two-dimentional computation model, is used for the solidification and heat transfer process of molten steel in the online real-time simulation continuous cast mold.
Described output module as a result is used for showing and preserves result of calculation, this as a result output module export the hold function module automatically by data and result of calculation graphical display function module is formed.
Described geometric parameter comprises the insertion depth of thermocouple and apart from the parameter of meniscus distance.
The present invention compared with prior art has following main beneficial effect:
The solidification and heat transfer of strand has crucial effects to the stable operation of continuous casting production and the quality of strand product in the crystallizer, and the continuous cast mold that is in the elevated temperature heat load is bearing high-temperature molten steel, solidify all multifactor influences such as strand, solid-liquid slag, mold oscillation, cooling water, cause the solidification and heat transfer instability easily, be unfavorable for continuous production.The Temperature Distribution that measures in real time from the copper plate of crystallizer thermocouple of the present invention for this reason, utilize different casting machine parameters, steel grade data parameters and processing parameter to come initialization system, the solidification and heat transfer process of molten steel in the whole crystallizer of online simulation, obtain and produce relevant important metallurgical parameter, instruct the direct motion of continuous casting production with this.
For example: in the actual production, the slab caster casting Stb32 steel of 1000 * 200 mm, 1572 ℃ of cast temperatures, measurement point is apart from meniscus position 100 mm and 200 mm positions in real time, thermocouple inserts the copper coin position apart from copper coin hot side 22 mm, and the temperature that online real-time measurement is 2 is respectively 105 ℃ and 97 ℃.In the Temperature Distribution and thermocouple location parameter import system that will measure, just can access crystallizer shell thickness 17.8 mm, go out 1147 ℃ of crystallizer base shell surface temperatures, the crystallizer ideal taper is 1.06 %/m.Wide the copper coin water yield 3850 L/min of crystallizer, 4 ℃ of the temperature difference, with actual amount of water 3950 L/min, 4.5 ℃ of data of the temperature difference conform to substantially.Under this condition of these data declarations, working condition meets continuous casting operation requirement, need not the adjusting process parameter and can guarantee that continuous casting production carries out smoothly.
Hence one can see that, and the present invention is simple and easy to do, applicability is high, reliability is high, can be used in solidification of molten steel diabatic process in the online multiple spot continuous measurement slab caster mould, and in large-scale production, convenient way is put forward in the adjustment of continuous casting manufacturing technique.
Description of drawings
Fig. 1 is heat flow density distribution map in the crystallizer that obtains when 1000 * 200 mm slab caster top casting Stb32 steel.
Fig. 2 is base shell surface temperature distribution figure in the crystallizer that obtains when 1000 * 200 mm slab caster top casting Stb32 steel.
Fig. 3 is thickness of solidified slab shell in secondary distribution map in the crystallizer that obtains when 1000 * 200 mm slab caster top casting Stb32 steel.
The copper plate of crystallizer cold and hot surface temperature profile of Fig. 4 for when 1000 * 200 mm slab caster top casting Stb32 steel, obtaining.
Fig. 5 concerns distribution map for the copper plate of crystallizer back draught that obtains when 1000 * 200 mm slab caster top casting Stb32 steel.
The specific embodiment
Below in conjunction with embodiment and accompanying drawing the present invention is further elaborated.
The system of solidification of molten steel diabatic process in the multiple spot continuous measurement simulation continuous cast mold provided by the invention, by model data initialization module, data run module and as a result output module three parts form, wherein: the model data initialization module is successively by the conticaster database, physical parameter database and production technology database are formed, and set up interface to link to each other with the input of data run module on module; In the online importing control system, the crystallizer cooled copper temperature that thermocouple monitoring obtains, and the geometric parameter of this position (for example the insertion depth of thermocouple and apart from the meniscus distance parameter) imported, and confirm the data input; The data run module is made up of one dimension computation model and two-dimentional computation model, is used for the solidification and heat transfer process of molten steel in the online real-time simulation continuous cast mold; Output module is used for showing and preserve result of calculation that this module exports hold function automatically by data and the result of calculation graphical display function is formed, and sets up interface to link to each other with the output of data run module on module as a result.
The system of solidification of molten steel diabatic process can be used in solidification of molten steel diabatic process in the online multiple spot continuous measurement slab caster mould in the multiple spot continuous measurement simulation continuous cast mold provided by the invention.Be exemplified below:
At 1000 * 200 mm slab caster top casting Stb32 steel.
1. model data initialization procedure:
At first confirm: slab two dimension computation model, crystallizer size 1000 * 200 mm, crystallizer height 900 mm, meniscus position 100 mm, time step 0.1 s, space step-length 10 mm;
Secondly by confirming steel grade Stb32, obtain the steel grade physical parameter, this parameter comprises the liquidus temperature of steel grade, solid-state temperature, latent heat of solidification, thermal conductivity factor, thermal coefficient of expansion, solid phase specific heat capacity, liquid phase specific heat capacity, solid phase density, density of liquid phase and two-phase section steel grade density;
In the production technology database, confirm 1572 ℃ of pouring temperatures, pulling rate 1.2 m/min, copper plate of crystallizer effective thickness 24 mm, 35 ℃ of crystallizer cooling water initial temperatures, flow velocity 8 m/s then.
2. real-time copper plate temperature parameter importing process:
Temperature Distribution relation and the thermocouple location relation that the monitoring in real time of crystallizer copper plate of plate blank continuous casting machine thermocouple is obtained imports in the production technology database, measurement point is apart from meniscus position 100 mm and 200 mm positions in real time, thermocouple inserts the copper coin position apart from copper coin hot side 22 mm, and the temperature that online real-time measurement is 2 is respectively 105 ℃ and 97 ℃.
3. data computation process:
By receiving the primary data that the model data initialization procedure obtains, in the operation computing system, utilize slab two dimension computation model, calculate solidification of molten steel diabatic process in the crystallizer.
Described computing system is by the model data initialization module, the data run module and as a result output module three parts form, wherein core process is to be feature with the safe shell thickness that the solidification and heat transfer process is set, conversion obtains the convenient condition of heat flow density on the unit are, calculates the solidification and heat transfer process of molten steel in the crystallizer with this.
4. result of calculation output procedure:
By program the result that data computation obtains is preserved automatically, and in graphical display function, the relevant important metallurgical parameter that shows the solidification and heat transfer process, this parameter comprises thickness of solidified slab shell in secondary, copper plate of crystallizer cold and hot surface temperature and copper plate of crystallizer back draught relation in heat flow density in the crystallizer, the interior base shell surface temperature of crystallizer, the crystallizer, and available Fig. 1-Fig. 5 represents.
Heat flow density distributes as shown in Figure 1 in the crystallizer that present embodiment calculates: meniscus position heat flow density maximum, and far away more with the meniscus distance, the heat flow density in the crystallizer is low more, and this conforms to actual.
Base shell surface temperature distribution as shown in Figure 2 in the crystallizer that present embodiment calculates: molten steel solidifies rapidly at meniscus, and the solidified shell temperature is along with the increasing of distance meniscus distance, and temperature reduces gradually.The solidified shell bight is owing to be subjected to the influence of Two-Dimensional Heat, and temperature reduces the fastest, and the solidification of molten steel heat transfer is mainly spread out of by wide face in addition, temperature reduce than leptoprosopy come more rapid.
Thickness of solidified slab shell in secondary distributes as shown in Figure 3 in the crystallizer that present embodiment calculates: molten steel begins to solidify in meniscus position, increasing along with distance crystallizer meniscus distance, the continuation of solidification and heat transfer process, solidified shell increases gradually, changes to be the parabola rule distribution.
The copper plate of crystallizer cold and hot surface Temperature Distribution that present embodiment calculates is as shown in Figure 4: copper plate of crystallizer cold and hot surface temperature distributing rule is consistent with the crystallizer heat flow density regularity of distribution.The hot side maximum temperature is lower than the copper plate of crystallizer recrystallization temperature, can normally use.
The copper plate of crystallizer back draught relation that present embodiment calculates distributes as shown in Figure 5: conical degree of crystallizer distributes to meet and solidifies the regularity of distribution, has the parabola variation characteristic.
Claims (5)
1. the system of solidification of molten steel diabatic process in the continuous cast mold is simulated in the multiple spot continuous measurement, it is characterized in that this system by model data initialization module, data run module and as a result output module three parts form, wherein: the model data initialization module sets up interface to link to each other with the input of data run module; Output module sets up interface to link to each other with the output of data run module as a result; The crystallizer cooled copper temperature that the model data initialization module obtains thermocouple monitoring, and the geometric parameter at this crystallizer cooled copper temperature place imports in the data run module, and affirmation data input, after the data run resume module, obtain described solidification of molten steel diabatic process, then by output module output as a result.
2. system according to claim 1 is characterized in that described model data initialization module is provided with the conticaster database, physical parameter database and production technology database.
3. system according to claim 1 is characterized in that described data run module is made up of one dimension computation model and two-dimentional computation model, is used for the solidification and heat transfer process of molten steel in the online real-time simulation continuous cast mold.
4. system according to claim 1 is characterized in that described output module as a result is used for showing and preserves result of calculation, this as a result output module export the hold function module automatically by data and result of calculation graphical display function module is formed.
5. system according to claim 1 is characterized in that described geometric parameter comprises the insertion depth of thermocouple and apart from the parameter of meniscus distance.
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| CN103192048A (en) * | 2013-04-07 | 2013-07-10 | 北京科技大学 | Continuous casting slab solidification cooling process analogy method based on precise thermophysical parameters |
| CN114466716A (en) * | 2019-10-03 | 2022-05-10 | 杰富意钢铁株式会社 | Device for estimating thickness of solidified shell in mold, method for estimating thickness of solidified shell in mold, and method for continuously casting steel |
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| JPH06154982A (en) * | 1992-11-26 | 1994-06-03 | Nippon Steel Corp | Method and device for monitoring mold temperature in continuous casting |
| CN101398371A (en) * | 2008-10-29 | 2009-04-01 | 大连理工大学 | Detection method for protection slag of continuous casting crystallizer in thermal state lubrication friction state |
| CN102039385A (en) * | 2010-11-29 | 2011-05-04 | 东北大学 | Method for determining thicknesses of solid-liquid slag lubricating films on basis of temperature measuring continuous-casting mold of thermoelectric couple |
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| JPH0679424A (en) * | 1992-09-01 | 1994-03-22 | Nippon Steel Corp | Method for controlling fluidity in mold by dc magnetic field |
| JPH06154982A (en) * | 1992-11-26 | 1994-06-03 | Nippon Steel Corp | Method and device for monitoring mold temperature in continuous casting |
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| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103192048A (en) * | 2013-04-07 | 2013-07-10 | 北京科技大学 | Continuous casting slab solidification cooling process analogy method based on precise thermophysical parameters |
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| CN114466716A (en) * | 2019-10-03 | 2022-05-10 | 杰富意钢铁株式会社 | Device for estimating thickness of solidified shell in mold, method for estimating thickness of solidified shell in mold, and method for continuously casting steel |
| CN114466716B (en) * | 2019-10-03 | 2023-09-08 | 杰富意钢铁株式会社 | Device for estimating thickness of solidified shell in mold, method for estimating thickness of solidified shell in mold, and method for continuously casting steel |
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Application publication date: 20111102 |