CN101934353A - Device and method for breakout prediction during slab continuous casting - Google Patents
Device and method for breakout prediction during slab continuous casting Download PDFInfo
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- CN101934353A CN101934353A CN2009100575154A CN200910057515A CN101934353A CN 101934353 A CN101934353 A CN 101934353A CN 2009100575154 A CN2009100575154 A CN 2009100575154A CN 200910057515 A CN200910057515 A CN 200910057515A CN 101934353 A CN101934353 A CN 101934353A
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Abstract
The invention discloses a device for breakout prediction during slab continuous casting. At least four rows of thermocouples are arranged on a continuous casting mould from a meniscus of the mould to a mould outlet in an array mode, wherein all the thermocouples are connected to a computing control unit; and the computing control unit computes the temperature distribution state of molten steel in the mould according to temperature information of the thermocouples to determine whether a breakout alarm is needed. The invention also discloses a method for realizing the breakout prediction during the slab continuous casting by the device, which comprises the steps that: the computing control unit acquires the temperature information of the thermocouples and establishes a mathematical model for a temperature field of the mould; and when the distance from the position of the maximum temperature of the molten steel in the mould to the height of the mould outlet is less than a preset threshold value, the computing control unit sends out the breakout alarm. Through the device and the method, the alarm can be immediately sent before the occurrence of the breakout and breakout accidents can be avoided.
Description
Technical field
The present invention relates to the supervising device in a kind of continuous casting process, especially a kind of device that forecasts bleed-out in the sheet billet continuous casting process.The invention still further relates to the method for supervising in a kind of continuous casting process, especially a kind of method of forecasting bleed-out in the sheet billet continuous casting process.
Background technology
Produce in all kinds of steel products processes in steel plant, use molten steel solidification to form two kinds of methods: traditional die casting and continuous casting steel machine method.Compare with conventional method, continuous casting technology has and significantly improves recovery rate of iron and slab quality, significant advantages such as energy savings.The idiographic flow of continuous casting steel machine is: molten steel pulls straight from the outlet of crystallizer below behind the duricrust that congeals into constantly by water mold, through the water spray cooling, is cut into the foundry technology process of blank after all solidifying.
The direct motion of continuous casting production and continuous casting billet quality are two main tasks of continuous casting working procedure.In continuous casting was produced, bleed-out was the production contingency that has harmfulness, according to statistics, bleed-out accident of every generation, minimum needs of processing time five hours, only spare part maintenance aspect will spend 500,000 yuan at least.
The bleed-out accident is broadly divided into: open and water bleed-out, suspension bleed-out, crackle bleed-out, slag inclusion bleed-out, cut off bleed-out, bonding steel leakage.Wherein bonding steel leakage accounting example in various bleed-out accidents is about more than 67%, and bonding steel leakage accounts for the overwhelming majority in the various reasons that cause the bleed-out accident, and therefore reducing sticker type breakout is the key point that reduces the continuous casting bleed-out rate.
In order accurately to forecast the generation of bonding steel leakage, the technology of exploitation mainly contains both at home and abroad in recent years: the wave analysis of shaking, detection crystallizer frictional force, three kinds of methods of thermocouple temperature measurement.What exist at present extensively all is to arrange two row or three heat extraction galvanic couples on crystallizer, on the layout of thermocouple, mainly also is mounted in the bottom of meniscus, and intercepting crystallizer copper plate temperature carries out model and calculates for linearizing relatively one section.But because fluctuation of the composition of the variation of steel grade, covering slag and the operation of change slag line etc. the turned upside down of crystallizer copper plate temperature occurs through regular meeting, thereby take place to report by mistake or fail to report, and almost are difficult to catch for the generation of crackle bleed-out.The calculating of crystallizer thermography at present also is in the off-line simulation stage; be to continue to optimize gained by desirable heat transfer model and according to a large amount of historical datas; its computational speed can't satisfy real-time calculating and the display requirement that continuous casting is produced; the Temperature Distribution that can not show copper plate of crystallizer is real-time dynamicly analyzed the solidify situation of molten steel in crystallizer, can not estimate mouth of a river centering situation intuitively according to the thermography of copper plate of crystallizer; the local cooling effect of copper coin; the situation of continuous casting billet base shell; conical degree of crystallizer is adjusted situation; the fusing of covering slag and lubrication circumstances; the crackle production of slab base shell in the crystallizer.
Summary of the invention
Technical problem to be solved by this invention provides a kind of device and method that forecasts bleed-out in the sheet billet continuous casting process, can forecast bonding steel leakage timely and accurately, can also find the crackle bleed-out in real time by observation thermal image figure, thereby improved production efficiency and slab quality that continuous casting is produced, avoided the generation of bleed-out accident.
For solving the problems of the technologies described above, the present invention forecasts that the technical scheme of the device of bleed-out in the sheet billet continuous casting process is, on the sidewall of continuous cast mold from the crystallizer meniscus to crystallizer outlet with the arranged in form at least 4 heat extraction galvanic couples of array, described thermocouple all is connected to a calculation control unit, described calculation control unit is according to the temperature distribution state of molten steel in the temperature information calculating crystallizer of thermocouple, to determine whether that need carry out bleed-out reports to the police.
The present invention also provides the method for bleed-out in the forecast sheet billet continuous casting process that a kind of device that adopts bleed-out in the above-mentioned forecast sheet billet continuous casting process realizes, its technical scheme is, described calculation control unit is gathered the temperature information of thermocouple, set up the Mathematical Modeling of mould temperature field, when the height that exports apart from crystallizer when the position of molten steel maximum temperature in the crystallizer was lower than pre-set threshold, described calculation control unit was sent bleed-out and is reported to the police.
The solidify situation of copper plate of crystallizer mathematic model of temperature field energy Real time dynamic display molten steel in crystallizer that the present invention draws; and forecast with unerring accuracy bonding steel leakage and crackle bleed-out, allow technology and operating personnel observe the crackle production of slab base shell in the centering situation at formation situation, the mouth of a river of near casting blank shell near the fusing situation, meniscus of the covering slag liquid level, fusing that conical degree of crystallizer is adjusted situation, covering slag and lubrication circumstances, the crystallizer very intuitively.
Description of drawings
The present invention is further detailed explanation below in conjunction with the drawings and specific embodiments:
Fig. 1 forecasts the structural representation of the device of bleed-out in the sheet billet continuous casting process for the present invention;
Fig. 2 forecasts the thermography that method embodiment set up of bleed-out in the sheet billet continuous casting process for the present invention;
Fig. 3 is the temperature profile of crystallizer;
Fig. 4 is the schematic diagram that carries out the reduction of speed operation.
The specific embodiment
The invention discloses a kind of device that forecasts bleed-out in the sheet billet continuous casting process, as shown in Figure 1, crystallizer west side 101 around the crystallizer sidewall comprises, east side 102, outer arc 103 and inner arc 104 are formed, on the sidewall of continuous cast mold from the crystallizer meniscus to crystallizer outlet with the arranged in form at least 4 heat extraction galvanic couples 200 of array, described thermocouple all is connected to a calculation control unit, described calculation control unit is according to the temperature distribution state of molten steel in the temperature information calculating crystallizer of thermocouple, to determine whether that need carry out bleed-out reports to the police.
At least meniscus, meniscus to the crystallizer middle part and crystallizer middle part to crystallizer outlet arrange a heat extraction galvanic couple at least respectively, and described thermocouple all evenly distributes.
Thermocouple is vertically mounted on the crystallizer, the first heat extraction galvanic couple installation site that participates in warning calculating is at distance meniscus vertical height 70～120mm place, residue row's thermocouple evenly is installed on the crystallizer sidewall according to row's spacing of 100～150mm, and the column pitch of thermocouple is 1～1.5 with the ratio of arranging spacing.
The present invention also provides the method for bleed-out in the forecast sheet billet continuous casting process that a kind of device that adopts bleed-out in the above-mentioned forecast sheet billet continuous casting process realizes, described calculation control unit is gathered the temperature information of thermocouple, set up the Mathematical Modeling of mould temperature field, thermography for example, as shown in Figure 2, with the temperature of thermography each point by carrying out visualization display from deep to shallow, if employing colored views, can also be by carrying out visualization display from black-ash-indigo plant-red-yellow color more than at least 50 kinds, when the height that exports apart from crystallizer when the position of molten steel maximum temperature in the crystallizer was lower than pre-set threshold, described calculation control unit was sent bleed-out and is reported to the police.
Described calculation control unit adopts interpolation method to set up the Mathematical Modeling of mould temperature field in conjunction with the temperature data of described thermocouple.
The process that sticker type breakout produces can be divided into following 5 steps, and as shown in Figure 3, wherein curve 1 is the Temperature Distribution under the normal condition, and the Temperature Distribution behind the 18s takes place for boning curve 2, and curve 3 is the Temperature Distribution after 54s takes place bonding:
A) owing to lack the lubricated of covering slag, nascent solidified shell is bonded on the crystallizer copper wall.
B) produce pulling force in the mold oscillation process, initial solidification shell pulls open, and inner steel flow is to the copper plate of crystallizer surface, and is frozen into new green compact shell once more.
C) new green compact shell is subjected to same pulling force and breaks once more.
D) propagate according to the function mode of teeming speed along the length of mould direction base shell tear place.
E) rent arrives the crystallizer bottom, and bleed-out takes place.
Bonding point originates in the meniscus place of molten steel in the crystallizer, along with the vibration of crystallizer and the drop-down bonding point of strand also move to outlet, its temperature can raise in the time of near bonding point moves to the first heat extraction galvanic couple, process thermocouple place then temperature peaks, the first row's temperature that continues then to move down reduces gradually, and because close with the second heat extraction galvanic couple position, the second heat extraction galvanic couple temperature begins to rise, be displaced downwardly to the second heat extraction galvanic couple place then the second heat extraction galvanic couple temperature reach peak, and the like, the lasting again downward trend of temperature rising earlier is delivered to last row successively like this.Because the bonding vestige is in the shape of the letter V, not only in the transmission that vertically has the bonding feature, in the transmission that laterally has the bonding feature too.
Because the composition of the variation of steel grade, covering slag fluctuates and becomes slag line operation etc., the turned upside down of crystallizer copper plate temperature occurs in the prior art, thereby take place to report by mistake or fail to report through regular meeting.And among the present invention, the even above thermocouple of 4 rows that distributes of outlet from meniscus to crystallizer, have two advantages: which row the electric thermo-couple temperature that (1) participates in warning calculating no longer definitely is set to, but can manually be provided with according to the on-the-spot technology and the condition of production neatly; (2) temperature of gathering by many heat extractions galvanic couple can reflect strand solidified inside situation more careful, truly according to the interpolation calculation thermography.
The heat transfer phenomenon of continuous casting production process is very complicated, is difficult to reflect in real time, exactly the scene temperature field distribution by the thermography of setting desirable heat transfer condition analog computation gained.And, utilize the actual temperature of thermocouple by intensive layout thermocouple on crystallizer, and adopt linear interpolation method and parabolic interpolation to calculate mould temperature and distribute, not only computational speed is fast, and the gained thermography is also more near actual conditions.Calculate the gained thermography by the inventive method; owing to export real time temperature interpolation gained according to meniscus to crystallizer; by monitoring the real-time change of thermography; clearly the growing state of the local cooling effect of analysis and judgement delivery port centering situation, copper coin, continuous casting billet base shell, conical degree of crystallizer adjust situation, covering slag fusing and lubrication circumstances, especially crystallizer in the crackle production of slab base shell.
What linear interpolation method was relatively more crucial is the equalization point that need find interpolation step-length, computational speed and display effect in actual motion, and occur when unusual when thermocouple, need adopt temperature compensation algorithm try to achieve to the thermocouple of crystallizer inside or periphery according to the heat transfer theory of vertical direction in the crystallizer and horizontal direction.
When the temperature data of thermocouple exceeds normal number range or temperature data fluctuation when too greatly too frequent, described calculation control unit thinks that this thermocouple lost efficacy, utilize the temperature data of this thermocouple thermocouple on every side that this thermocouple is carried out temperature compensation algorithm calculating earlier, adopt this compensation result calculated to set up the Mathematical Modeling of mould temperature field then.
After bleed-out is reported to the police, reduce pulling rate earlier, if the position of molten steel maximum temperature does not still recover normal in the crystallizer, then take emergency shutdown to take place to avoid the bleed-out accident to continuous casting system.If after the reduction pulling rate, the bleed-out alarm release then according to as shown in Figure 4, returns to normal condition with pulling rate gradually.
Because the electric thermo-couple temperature absolute value difference under the different conticasters, different steel grade, different technology conditions is very big, therefore the parameter that adopts of the logic judgment models that adopts in the present invention such as range of temperature, bonding transmission speed and pulling rate ratio, temperature changing speed, root mean square etc. have all shielded the influence of pulling rate and temperature absolute value.Judge to meet and carry out neutral net under the criterion condition that sets in advance and calculate that the input-output of bonding feature and pulling rate and electric thermo-couple temperature being set up in the study of a series of measured datas by neutral net concerns in logic.Can improve precision of prediction reducing under the prerequisite of computation complexity thus, thereby in real time, bonding steel leakage forecasts with unerring accuracy.
It is many that the color development aspect color category of visual figure is wanted, and the intermediate color between the shades of colour will ascertain the number by test.
Temperature compensation algorithm described here adopts different backoff algorithms to boundary electric thermo-couple temperature and inner electric thermo-couple temperature respectively according to crystallizer vertical and horizontal heat compensator conducting property.
In sum; the solidify situation of copper plate of crystallizer mathematic model of temperature field energy Real time dynamic display molten steel in crystallizer that the present invention draws; and forecast with unerring accuracy bonding steel leakage and crackle bleed-out; allow technology and operating personnel observe the crackle production of slab base shell in the centering situation at formation situation, the mouth of a river of near casting blank shell near the fusing situation, meniscus of the covering slag liquid level, fusing that conical degree of crystallizer is adjusted situation, covering slag and lubrication circumstances, the crystallizer very intuitively; and can in time send bleed-out and report to the police, avoid the generation of bleed-out accident.
Claims (5)
1. device that forecasts bleed-out in the sheet billet continuous casting process, it is characterized in that, on the sidewall of continuous cast mold from the crystallizer meniscus to crystallizer outlet with the arranged in form at least 4 heat extraction galvanic couples of array, described thermocouple all is connected to a calculation control unit, described calculation control unit is according to the temperature distribution state of molten steel in the temperature information calculating crystallizer of thermocouple, to determine whether that need carry out bleed-out reports to the police.
2. the device of bleed-out in the forecast sheet billet continuous casting process according to claim 1, it is characterized in that, at least meniscus, meniscus to the crystallizer middle part and crystallizer middle part to crystallizer outlet arrange a heat extraction galvanic couple at least respectively, and described thermocouple all evenly distributes.
3. the device of bleed-out in the forecast sheet billet continuous casting process according to claim 1, it is characterized in that, thermocouple is vertically mounted on the crystallizer, the first heat extraction galvanic couple installation site that participates in warning calculating is at distance meniscus vertical height 70～120mm place, residue row's thermocouple evenly is installed on the crystallizer sidewall according to row's spacing of 100～150mm, and the column pitch of thermocouple is 1～1.5 with the ratio of arranging spacing.
4. the method for bleed-out in the forecast sheet billet continuous casting process that any described device is realized in employing such as the claim 1～3, it is characterized in that, described calculation control unit is gathered the temperature information of thermocouple, set up the Mathematical Modeling of mould temperature field, when the height that exports apart from crystallizer when the position of molten steel maximum temperature in the crystallizer was lower than pre-set threshold, described calculation control unit was sent bleed-out and is reported to the police.
5. the method for bleed-out in the forecast sheet billet continuous casting process according to claim 4; it is characterized in that, after bleed-out is reported to the police, reduce pulling rate earlier; if the position of molten steel maximum temperature does not still recover normal in the crystallizer, then take emergency shutdown to take place to avoid the bleed-out accident to continuous casting system.
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| CN101941060A (en) * | 2010-09-19 | 2011-01-12 | 河北钢铁股份有限公司唐山分公司 | Crystallizer thermography real-time display method based on multirow actual measurement thermocouple temperature |
| CN102205403A (en) * | 2011-04-24 | 2011-10-05 | 大连理工大学 | Method for detecting local heat flow of continuous casting crystallizer copper plate |
| CN102699302A (en) * | 2012-07-10 | 2012-10-03 | 中冶赛迪电气技术有限公司 | Bleed-out forecasting system and forecasting method of slab continuous casting crystallizer |
| CN104759598A (en) * | 2015-03-18 | 2015-07-08 | 山东钢铁股份有限公司 | Method and device for submersed nozzle slag line of automatic adjusting slab caster |
| CN105108097A (en) * | 2015-07-24 | 2015-12-02 | 安徽工业大学 | Hybrid model and hybrid-model-based continuous casting breakout prediction method |
| CN105945253A (en) * | 2016-07-15 | 2016-09-21 | 中冶赛迪工程技术股份有限公司 | Roll gap control method after bleed-out of slab caster |
| CN106413942A (en) * | 2014-01-31 | 2017-02-15 | 新日铁住金株式会社 | Method, device and program for determining casting state in continuous casting |
| CN107096899A (en) * | 2017-05-17 | 2017-08-29 | 安徽工业大学 | The crystallizer bleedout prediction electric thermo system that a kind of logic-based judges |
| CN107159862A (en) * | 2017-05-17 | 2017-09-15 | 安徽工业大学 | A kind of crystallizer bleedout prediction electric thermo method that logic-based judges |
| CN107252882A (en) * | 2017-06-18 | 2017-10-17 | 钢铁研究总院 | Method and system for Direct Rolling high temperature billet continuous casting process breakout prediction |
| CN108296462A (en) * | 2018-03-30 | 2018-07-20 | 江西铜业集团有限公司 | A kind of leakproof crystallizer system |
| CN108580827A (en) * | 2018-05-22 | 2018-09-28 | 大连理工大学 | A method of Crystallizer bleed-out is forecast based on Agglomerative Hierarchical Clustering |
| CN110315046A (en) * | 2018-03-30 | 2019-10-11 | 宝山钢铁股份有限公司 | Prevent the process of continuous casting billet narrow side bulge |
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| CN111761040A (en) * | 2020-07-14 | 2020-10-13 | 五矿营口中板有限责任公司 | Method and device for online identifying reverse sequence of thermocouple installation of crystallizer breakout prediction system |
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| CN102205403A (en) * | 2011-04-24 | 2011-10-05 | 大连理工大学 | Method for detecting local heat flow of continuous casting crystallizer copper plate |
| CN102205403B (en) * | 2011-04-24 | 2012-07-25 | 大连理工大学 | Method for detecting local heat flow of continuous casting crystallizer copper plate |
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| CN105945253A (en) * | 2016-07-15 | 2016-09-21 | 中冶赛迪工程技术股份有限公司 | Roll gap control method after bleed-out of slab caster |
| CN107159862B (en) * | 2017-05-17 | 2018-09-11 | 安徽工业大学 | A kind of crystallizer bleedout prediction electric thermo method that logic-based judges |
| CN107096899A (en) * | 2017-05-17 | 2017-08-29 | 安徽工业大学 | The crystallizer bleedout prediction electric thermo system that a kind of logic-based judges |
| CN107159862A (en) * | 2017-05-17 | 2017-09-15 | 安徽工业大学 | A kind of crystallizer bleedout prediction electric thermo method that logic-based judges |
| CN107252882A (en) * | 2017-06-18 | 2017-10-17 | 钢铁研究总院 | Method and system for Direct Rolling high temperature billet continuous casting process breakout prediction |
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