CN117494426A - Method and model for preventing slag-rolling steel leakage of continuous casting slab - Google Patents
Method and model for preventing slag-rolling steel leakage of continuous casting slab Download PDFInfo
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- 229910000831 Steel Inorganic materials 0.000 title claims abstract description 79
- 239000010959 steel Substances 0.000 title claims abstract description 79
- 238000000034 method Methods 0.000 title claims abstract description 47
- 238000009749 continuous casting Methods 0.000 title claims abstract description 44
- 238000005096 rolling process Methods 0.000 title claims abstract description 21
- 239000002893 slag Substances 0.000 claims abstract description 53
- 239000010949 copper Substances 0.000 claims description 21
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 19
- 229910052802 copper Inorganic materials 0.000 claims description 19
- 238000005266 casting Methods 0.000 claims description 17
- 238000009529 body temperature measurement Methods 0.000 claims description 15
- XAGFODPZIPBFFR-UHFFFAOYSA-N aluminium Chemical compound [Al] XAGFODPZIPBFFR-UHFFFAOYSA-N 0.000 claims description 14
- 229910052782 aluminium Inorganic materials 0.000 claims description 14
- 239000007788 liquid Substances 0.000 claims description 10
- 229910052799 carbon Inorganic materials 0.000 claims description 9
- OKTJSMMVPCPJKN-UHFFFAOYSA-N Carbon Chemical compound [C] OKTJSMMVPCPJKN-UHFFFAOYSA-N 0.000 claims description 8
- 239000000126 substance Substances 0.000 claims description 8
- 230000001133 acceleration Effects 0.000 claims description 6
- 239000000498 cooling water Substances 0.000 claims description 6
- 238000009825 accumulation Methods 0.000 claims description 3
- 238000000605 extraction Methods 0.000 description 15
- 238000004519 manufacturing process Methods 0.000 description 7
- 238000003860 storage Methods 0.000 description 4
- 101000686227 Homo sapiens Ras-related protein R-Ras2 Proteins 0.000 description 3
- 102100025003 Ras-related protein R-Ras2 Human genes 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 239000000203 mixture Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000006835 compression Effects 0.000 description 1
- 238000007906 compression Methods 0.000 description 1
- 230000007547 defect Effects 0.000 description 1
- 238000011835 investigation Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 230000000007 visual effect Effects 0.000 description 1
Classifications
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/18—Controlling or regulating processes or operations for pouring
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D46/00—Controlling, supervising, not restricted to casting covered by a single main group, e.g. for safety reasons
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- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F30/00—Computer-aided design [CAD]
- G06F30/20—Design optimisation, verification or simulation
-
- G—PHYSICS
- G06—COMPUTING; CALCULATING OR COUNTING
- G06F—ELECTRIC DIGITAL DATA PROCESSING
- G06F2119/00—Details relating to the type or aim of the analysis or the optimisation
- G06F2119/08—Thermal analysis or thermal optimisation
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Abstract
The invention discloses a method and a model for preventing slag-rolling steel leakage of a continuous casting slab, and belongs to the technical field of slab continuous casting in the metallurgical industry. The invention relates to a method and a model for preventing slag leakage of continuous casting slabs, which comprise the following steps: step one, pouring steel, namely pouring molten steel with components and temperature meeting process requirements into a tundish, and then pouring the molten steel into a crystallizer through a submerged nozzle. The invention solves the problems that the prior art is mainly used for optimizing an algorithm or increasing auxiliary judgment such as friction force and the like to further improve the accuracy of predicting bonding steel leakage and longitudinal steel leakage, reduce false alarm rate, hardly relate to the aspect of predicting slab continuous casting slag leakage, and can not prevent the occurrence of slag leakage.
Description
Technical Field
The invention relates to the technical field of slab continuous casting in the metallurgical industry, in particular to a method and a model for preventing slag leakage of continuous casting slabs.
Background
In slab production, steel leakage is one of the most harmful production accidents, the effective operation rate of a casting machine is directly influenced, the yield is reduced, and the precision of casting equipment is greatly damaged, so that the quality of casting blanks is influenced, zero steel leakage is always a target pursued by continuous casting workers, slab continuous casting machines mainly comprise a plurality of types of bonding steel leakage, slag rolling steel leakage, crack steel leakage and the like, each steel leakage is different in production reason and complex and various in reasons, a bonding steel leakage forecasting system is a model for forecasting bonding steel leakage and is the most mature, the bonding steel leakage in continuous casting production is effectively restrained, the casting speed of a conventional slab casting machine is greatly improved along with the high-force propulsion of continuous casting high-efficiency production in recent years, the probability of the slag rolling steel leakage of the casting blanks is synchronously increased, and an existing bonding steel leakage system cannot effectively forecast the slag rolling steel leakage, so that slag rolling steel leakage happens at time and huge losses are caused to enterprises.
In the prior art, the application number is as follows: 200710093907.7, in particular to a method for preventing bonding breakout from occurring according to the temperature change condition of a thermocouple of a crystallizer in the slab continuous casting process.
The application number is: 200910055590.7 overcomes the limitation of single investigation of transverse temperature difference or single consideration of temperature change rate of a longitudinal thermocouple in the past, thereby further improving the accuracy of forecasting the longitudinal crack event.
The application number is: 201710346785.1 crystallizer steel leakage prediction system based on logic judgment comprises a combined crystallizer, a thermocouple, a steel leakage prediction system computer, a PLC, a switch, a thermocouple compensation cable, an audible and visual alarm, a relay, a remote station, a data acquisition unit, a steel leakage data automatic compression storage unit, a self-learning and off-line analysis unit and an alarm and execution unit; the system comprises a steel leakage forecasting system computer, a steel leakage forecasting system computer and a steel leakage forecasting system computer, wherein the steel leakage forecasting system computer comprises a client and a server computer, and the client computer is used for monitoring and displaying steel leakage data; wherein the thermocouple buried columns and row spacing are designed such that the bonding tear path requires the same time to propagate one thermocouple spacing in both the lateral and longitudinal directions. The invention realizes the timely and accurate prediction of bonding steel leakage, ensures the smooth production of continuous casting and improves the quality of casting blanks.
However, the prior art is mainly used for optimizing an algorithm or adding auxiliary judgment such as friction force and the like to further improve the accuracy of predicting bonding steel leakage and longitudinal crack steel leakage, reduce the false alarm rate, hardly relate to the aspect of predicting slab continuous casting slag leakage, and cannot prevent the occurrence of slag leakage.
In order to overcome the defects, a method and a model for preventing slag leakage of continuous casting slabs are needed.
Disclosure of Invention
The invention aims to provide a method and a model for preventing slag leakage of continuous casting slabs, which can accurately forecast slag in time in the continuous casting pouring process, automatically take quick speed reduction measures, greatly reduce or even stop slag leakage accidents, and remarkably improve slag leakage forecast accuracy at the same time, thereby solving the problems in the prior art.
In order to achieve the above purpose, the present invention provides the following technical solutions: a method and a model for preventing slag leakage of continuous casting slabs comprise the following steps:
step one, pouring molten steel with components and temperature meeting process requirements into a tundish after steel ladle pouring, then pouring the molten steel into a crystallizer through a submerged nozzle, quickly solidifying the molten steel into a layer of primary blank shell around the crystallizer after the molten steel enters the crystallizer, continuously pouring the molten steel at a speed V (m/min), wherein the inner wall of a copper plate of the crystallizer is a cooling water gap, introducing high-pressure high-speed cooling water to lead out the heat of the molten steel, and arranging a heat removal couple at 180+/-5 mm, 350+/-5 mm and 460+/-5 mm away from the upper edge of the copper plate of the crystallizer;
when the molten steel surface is stabilized at a pull speed V (m/min) along the position about 100mm away from the crystallizer copper plate, conducting a large amount of molten steel heat to the copper plate, measuring a temperature value of each thermocouple buried in the inner wall of the copper plate in real time every 250 milliseconds, collecting and calculating by a data acquisition module, displaying the temperature of each thermocouple and the temperature measurement mean value of each thermocouple in real time, respectively recording the temperature measurement mean value of the first thermocouple, the temperature measurement mean value of the second thermocouple, the temperature measurement mean value of the third thermocouple, the temperature measurement mean value of the fourth thermocouple,
T1＝∑TC1x/X，T2＝∑TC2x/X，T3＝∑TC3x/X，
wherein X is the even number of each row of hot spots;
step three, synchronously collecting and calculating the following technological parameters by a continuous casting machine slag rolling and steel leakage prediction and control system: liquid level fluctuation, tundish tonnage, chemical component carbon equivalent, pull speed fluctuation, stopper rod sudden drop, aluminum inclusion, current accumulation value and ladle slag coming in advance;
calculating a process risk threshold F once every 250ms by a continuous casting machine slag rolling and steel leakage prediction and control system; f is the sum of the risk values of the process parameters;
step four, when F is less than 12, no slag rolling risk exists, normal casting is performed, when F is more than or equal to 12, the system reports yellow alarm, thermocouple temperature conditions are synchronously judged, and if the temperature value of a certain thermocouple in the first row is lower than the average value of the temperature of the same heat removal thermocouple at the time t1 by more than or equal to 10 ℃; and the temperature value of the thermocouple corresponding to the second row in the same column is lower than the average value of the temperatures of the thermocouples at the same heat removal temperature by more than or equal to 10 ℃ at the time of t1+h1/V (h 1 is the distance between the first row and the second heat removal thermocouple), or the temperature value of one thermocouple in the second row is lower than the average value of the temperatures of the thermocouples at the same heat removal temperature by more than or equal to 10 ℃ at the time of t 2; and the temperature value of the thermocouple corresponding to the third row in the same column is lower than the average value of the temperature of the thermocouple at the same heat extraction temperature of more than or equal to 10 ℃ at the moment of t2+h2/V (h 2 is the distance between the second row and the third heat extraction thermocouple), the system reports red alarm, the pulling speed is automatically reduced by 0.4m/min at the acceleration of 60m/min on the basis of the normal pulling speed V (m/min) and maintained for 30 seconds, the casting is continuously carried out at the gradual lifting pulling speed, otherwise, the pulling speed is automatically reduced by 0.4m/min at the acceleration of 25m/min on the basis of the normal pulling speed V (m/min) and maintained for 30 seconds, and the casting is continuously carried out after the yellow alarm is observed to be eliminated.
Preferably, the liquid level fluctuation is the difference between the maximum value and the minimum value of the actual molten steel level, which is more than or equal to 20mm and corresponds to a risk value of 5; and the risk value is greater than or equal to 10mm and corresponds to a risk value of 2.
Preferably, the tonnage of the tundish is the molten steel quantity in the tundish, which is less than or equal to 45 tons and corresponds to a risk value of 2; less than or equal to 35 tons, corresponding to a risk value of 5.
Preferably, the chemical component carbon equivalent is ceq=c+mn/6+ (cr+mo+v)/5+ (ni+cu)/15 in the range of 0.07-0.17, corresponding to a risk value of 2; otherwise, the risk value is 0.
Preferably, the pull speed fluctuation is an absolute value of a difference value between the actual pull speed and the set pull speed, which is greater than or equal to 0.05m/min and corresponds to a risk value of 2; and the risk value is greater than or equal to 0.1m/min and corresponds to a risk value of 4.
Preferably, the sudden drop of the stopper rod is that the drop of the stopper rod position within 10 seconds is more than or equal to 5mm, and the risk value is 2; the drop of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 5.
Preferably, the aluminum inclusion is the difference value between the total aluminum content in molten steel and acid-soluble aluminum, which is greater than or equal to 50ppm, and corresponds to a risk value of 3.
Preferably, the storage value is: the rise of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 2.
Preferably, the ladle is used for slag removal in advance: and the ladle slag in the ladle enters the tundish and corresponds to the risk value 1.
Compared with the prior art, the invention has the following beneficial effects:
the method and the model for preventing the slag leakage of the continuous casting slab can timely and accurately forecast the slag in the continuous casting pouring process, automatically take quick speed-reducing measures, greatly reduce or even stop the slag leakage accident, obviously improve the slag forecast accuracy, reduce the cost and improve the production efficiency.
Drawings
FIG. 1 is a flow chart of a method for preventing slab slag leakage according to the present invention;
FIG. 2 is a schematic diagram of a crystallizer copper plate thermocouple arrangement of the present invention;
FIG. 3 is a schematic diagram of the same row of thermocouples of the wide-face inner arc copper plate of the crystallizer of the invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In order to solve the technical problems that the prior art mainly optimizes an algorithm or increases auxiliary judgment such as friction force and the like to further improve the accuracy of predicting bonding steel leakage and longitudinal crack steel leakage, reduces the false alarm rate, hardly relates to the aspect of predicting slab continuous casting slag leakage, and cannot prevent the occurrence of slag leakage, referring to fig. 1-3, the following technical scheme is provided:
example 1
A method and a model for preventing slag leakage of continuous casting slabs comprise the following steps:
step one, pouring molten steel with components and temperature meeting process requirements into a tundish after steel ladle pouring, then pouring the molten steel into a crystallizer through a submerged nozzle, quickly solidifying the molten steel into a layer of primary blank shell around the crystallizer after the molten steel enters the crystallizer, continuously pouring the molten steel at a speed V (m/min), wherein the inner wall of a copper plate of the crystallizer is a cooling water gap, introducing high-pressure high-speed cooling water to lead out the heat of the molten steel, and arranging a heat removal couple at 180+/-5 mm, 350+/-5 mm and 460+/-5 mm away from the upper edge of the copper plate of the crystallizer;
when the molten steel surface is stabilized at a pull speed V (m/min) along the position about 100mm away from the crystallizer copper plate, conducting a large amount of molten steel heat to the copper plate, measuring a temperature value of each thermocouple buried in the inner wall of the copper plate in real time every 250 milliseconds, collecting and calculating by a data acquisition module, displaying the temperature of each thermocouple and the temperature measurement mean value of each thermocouple in real time, respectively recording the temperature measurement mean value of the first thermocouple, the temperature measurement mean value of the second thermocouple, the temperature measurement mean value of the third thermocouple, the temperature measurement mean value of the fourth thermocouple,
T1＝∑TC1x/X，T2＝∑TC2x/X，T3＝∑TC3x/X，
wherein X is the even number of each row of hot spots;
step three, synchronously collecting and calculating the following technological parameters by a continuous casting machine slag rolling and steel leakage prediction and control system: liquid level fluctuation, tundish tonnage, chemical component carbon equivalent, pull speed fluctuation, stopper rod sudden drop, aluminum inclusion, current accumulation value and ladle slag coming in advance;
calculating a process risk threshold F once every 250ms by a continuous casting machine slag rolling and steel leakage prediction and control system; f is the sum of the risk values of the process parameters;
step four, when F is less than 12, no slag rolling risk exists, normal casting is performed, when F is more than or equal to 12, the system reports yellow alarm, thermocouple temperature conditions are synchronously judged, and if the temperature value of a certain thermocouple in the first row is lower than the average value of the temperature of the same heat removal thermocouple at the time t1 by more than or equal to 10 ℃; and the temperature value of the thermocouple corresponding to the second row in the same column is lower than the average value of the temperatures of the thermocouples at the same heat removal temperature by more than or equal to 10 ℃ at the time of t1+h1/V (h 1 is the distance between the first row and the second heat removal thermocouple), or the temperature value of one thermocouple in the second row is lower than the average value of the temperatures of the thermocouples at the same heat removal temperature by more than or equal to 10 ℃ at the time of t 2; and the temperature value of the thermocouple corresponding to the third row in the same column is lower than the average value of the temperature of the thermocouple at the same heat extraction temperature of more than or equal to 10 ℃ at the moment of t2+h2/V (h 2 is the distance between the second row and the third heat extraction thermocouple), the system reports red alarm, the pulling speed is automatically reduced by 0.4m/min at the acceleration of 60m/min on the basis of the normal pulling speed V (m/min) and maintained for 30 seconds, the casting is continuously carried out at the gradual lifting pulling speed, otherwise, the pulling speed is automatically reduced by 0.4m/min at the acceleration of 25m/min on the basis of the normal pulling speed V (m/min) and maintained for 30 seconds, and the casting is continuously carried out after the yellow alarm is observed to be eliminated.
The liquid level fluctuation is the difference between the maximum value and the minimum value of the actual liquid level, which is more than or equal to 20mm and corresponds to a risk value of 5; and the risk value is greater than or equal to 10mm and corresponds to a risk value of 2.
The tonnage of the tundish is the molten steel quantity in the tundish and is less than or equal to 45 tons, and the corresponding risk value is 2; less than or equal to 35 tons, corresponding to a risk value of 5.
The carbon equivalent of the chemical component is Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 in the range of 0.07-0.17, corresponding to a risk value of 2; otherwise, the risk value is 0.
The pull speed fluctuation is the absolute value of the difference between the actual pull speed and the set pull speed, which is more than or equal to 0.05m/min and corresponds to a risk value of 2; and the risk value is greater than or equal to 0.1m/min and corresponds to a risk value of 4.
The drop of the stopper rod is more than or equal to 5mm within 10 seconds, and the risk value is 2; the drop of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 5.
The aluminum inclusion is the difference value between the total aluminum content in molten steel and acid-soluble aluminum, which is greater than or equal to 50ppm and corresponds to a risk value of 3.
Value of accumulated current: the rise of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 2.
Slag is introduced into the ladle in advance: and the ladle slag in the ladle enters the tundish and corresponds to the risk value 1.
The continuous casting slab is poured with a certain steel grade at a pull rate of V=1.6m/min, and the technological parameters are shown in the following table:
the continuous casting machine slag-rolling and steel-leakage prediction and control system firstly calculates a process risk threshold F=27 & gt12, and yellow alarms the system, as shown in fig. 3, the temperature value of a first heat extraction thermocouple TC11 of a wide-surface inner arc copper plate of a crystallizer at the moment T1 is 150 ℃, the temperature average value T1 of the first heat extraction thermocouple is 163 ℃, the difference value is more than 10 ℃, at the moment T1 < + > (h 1/V) =t1+ (350-180)/1.6 < (60/1000) =t1+6.4 seconds, the temperature value of a second heat extraction thermocouple TC21 is 129 ℃, the temperature average value T2 of the second heat extraction thermocouple is 141 ℃, the difference value is more than 10 ℃, the red alarms the system, the pulling speed V is rapidly reduced to 0.4m/min from 1.6m/min, the red alarms are eliminated for 30 seconds, and the primary slag-rolling and steel leakage is successfully avoided.
Example 2
The continuous casting slab is poured with a certain steel grade at a pull rate of V=2.0m/min, and the technological parameters are shown in the following table:
| process parameters | Actual value | Risk value |
| Liquid level toggle | 11mm | 2 |
| Tundish tonnage | 40 tons | 2 |
| Carbon equivalent of chemical composition | 0.03 | 0 |
| Fluctuation of pulling speed | 0.06m/min | 2 |
| Stopper rod jump | 6mm | 2 |
| Aluminum inclusion | 30ppm | 0 |
| Current storage value | 5mm | 0 |
| Ladle slag coming in advance | Whether or not | 0 |
The continuous casting machine slag-rolling steel leakage prediction and control system firstly calculates a process risk threshold value F=8 < 12, and the system has no alarm and is used for normal casting.
Example 3
The continuous casting slab is poured with a certain steel grade at a pull rate of V=1.4m/min, and the technological parameters are shown in the following table:
| process parameters | Actual value | Risk value |
| Liquid level toggle | 6mm | 0 |
| Tundish tonnage | 60 tons | 0 |
| Carbon equivalent of chemical composition | 0.09 | 2 |
| Fluctuation of pulling speed | 0.11m/min | 4 |
| Stopper rod jump | 12mm | 5 |
| Aluminum inclusion | 60ppm | 3 |
| Current storage value | 5mm | 0 |
| Ladle slag coming in advance | Whether or not | 0 |
The continuous casting machine slag-rolling and steel-leakage prediction and control system firstly calculates a process risk threshold F=14 & gt12, and yellow alarms the system, as shown in fig. 3, the temperature value of a second heat extraction thermocouple TC21 of a wide-surface inner arc copper plate of a crystallizer at the moment T2 is 108 ℃, the temperature average value T2 of the second heat extraction thermocouple is 121 ℃, the difference value is 13 ℃, the temperature average value is more than 10 ℃, the temperature average value of the third heat extraction thermocouple TC31 is 101 ℃ at the moment T2 < + > (h 2/V) =t2+ (460-350)/1.4 < (60/1000) > =t1+4.7 seconds, the temperature average value T2 of the second heat extraction thermocouple is 113 ℃, the temperature average value of the second heat extraction thermocouple is 12 ℃, the temperature average value of the second heat extraction thermocouple TC21 of the crystallizer drops to 0.4m/min rapidly at the moment of the moment T2, the temperature average value of the second heat extraction thermocouple is maintained for 30 seconds, then red and yellow alarms are eliminated, and one-time slag-rolling and steel-leakage is successfully avoided.
The foregoing is only a preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art, who is within the scope of the present invention, should be covered by the protection scope of the present invention by making equivalents and modifications to the technical solution and the inventive concept thereof.
Claims (9)
1. A method and a model for preventing slag leakage of continuous casting slabs are characterized by comprising the following steps:
step one, pouring molten steel with components and temperature meeting process requirements into a tundish after steel ladle pouring, then pouring the molten steel into a crystallizer through a submerged nozzle, quickly solidifying the molten steel into a layer of primary blank shell around the crystallizer after the molten steel enters the crystallizer, continuously pouring the molten steel at a speed V (m/min), wherein the inner wall of a copper plate of the crystallizer is a cooling water gap, introducing high-pressure high-speed cooling water to lead out the heat of the molten steel, and arranging a heat removal couple at 180+/-5 mm, 350+/-5 mm and 460+/-5 mm away from the upper edge of the copper plate of the crystallizer;
when the molten steel surface is stabilized at a pull speed V (m/min) along the position about 100mm away from the crystallizer copper plate, conducting a large amount of molten steel heat to the copper plate, measuring a temperature value of each thermocouple buried in the inner wall of the copper plate in real time every 250 milliseconds, collecting and calculating by a data acquisition module, displaying the temperature of each thermocouple and the temperature measurement mean value of each thermocouple in real time, respectively recording the temperature measurement mean value of the first thermocouple, the temperature measurement mean value of the second thermocouple, the temperature measurement mean value of the third thermocouple, the temperature measurement mean value of the fourth thermocouple,
T1＝∑TC1x/X，T2＝∑TC2x/X，T3＝∑TC3x/X，
wherein X is the even number of each row of hot spots;
step three, synchronously collecting and calculating the following technological parameters by a continuous casting machine slag rolling and steel leakage prediction and control system: liquid level fluctuation, tundish tonnage, chemical component carbon equivalent, pull speed fluctuation, stopper rod sudden drop, aluminum inclusion, current accumulation value and ladle slag coming in advance;
calculating a process risk threshold F once every 250ms by a continuous casting machine slag rolling and steel leakage prediction and control system; f is the sum of the risk values of the process parameters;
step four, when F is less than 12, no slag rolling risk exists, normal casting is performed, when F is more than or equal to 12, the system reports yellow alarm, thermocouple temperature conditions are synchronously judged, and if the temperature value of a certain thermocouple in the first row is lower than the average value of the temperature of the same heat removal thermocouple at the time t1 by more than or equal to 10 ℃; the temperature value of a thermocouple corresponding to the second row in the same column is t1+h1/V, h1 is the distance between the first row and the second heat removal thermocouple, the temperature average value of the same heat removal thermocouple is not less than 10 ℃ at any time, or the temperature value of a thermocouple in the second row is not less than 10 ℃ at any time at t 2; and the temperature value of the thermocouple corresponding to the third row in the same column is t2+ h2/V, h2 is the distance between the second row and the third heat removal couple, the temperature average value of the same heat removal couple is not less than 10 ℃ at any time, the system reports red alarm, the pulling speed automatically drops by 0.4m/min at the acceleration of 60m/min on the basis of the normal pulling speed V (m/min) and is maintained for 30 seconds, the casting is continuously carried out at the gradual lifting pulling speed, otherwise, the pulling speed automatically drops by 0.4m/min at the acceleration of 25m/min on the basis of the normal pulling speed V (m/min) and is maintained for 30 seconds, and the casting is continuously carried out after the yellow alarm is observed to be eliminated.
2. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the liquid level fluctuation is the difference between the maximum value and the minimum value of the actual liquid level, which is more than or equal to 20mm and corresponds to a risk value 5; and the risk value is greater than or equal to 10mm and corresponds to a risk value of 2.
3. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the tonnage of the tundish is the molten steel quantity in the tundish and is less than or equal to 45 tons, and the corresponding risk value is 2; less than or equal to 35 tons, corresponding to a risk value of 5.
4. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the carbon equivalent of the chemical component is Ceq=C+Mn/6+ (Cr+Mo+V)/5+ (Ni+Cu)/15 in the range of 0.07-0.17, and the corresponding risk value is 2; otherwise, the risk value is 0.
5. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the pull speed fluctuation is the absolute value of the difference between the actual pull speed and the set pull speed, and is more than or equal to 0.05m/min, and corresponds to a risk value of 2; and the risk value is greater than or equal to 0.1m/min and corresponds to a risk value of 4.
6. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the sudden drop of the stopper rod is that the drop of the stopper rod position within 10 seconds is more than or equal to 5mm, and the corresponding risk value is 2; the drop of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 5.
7. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the aluminum inclusion is the difference value between the total aluminum content in molten steel and acid-soluble aluminum, which is greater than or equal to 50ppm and corresponds to a risk value of 3.
8. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the value of the accumulated current: the rise of the stopper rod position within 10 seconds is more than or equal to 10mm, and corresponds to a risk value of 2.
9. The method and model for preventing slag leakage of continuous casting slab according to claim 1, wherein the method comprises the following steps: the big ladle is used for slag coming in advance: and the ladle slag in the ladle enters the tundish and corresponds to the risk value 1.
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