CN114850431B - Method for forecasting bleed-out of continuous casting crystallizer - Google Patents
Method for forecasting bleed-out of continuous casting crystallizer Download PDFInfo
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- CN114850431B CN114850431B CN202210781702.2A CN202210781702A CN114850431B CN 114850431 B CN114850431 B CN 114850431B CN 202210781702 A CN202210781702 A CN 202210781702A CN 114850431 B CN114850431 B CN 114850431B
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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
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/182—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by measuring temperature
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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
- B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
- B22D11/185—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level by using optical means
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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
- B22D2/00—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass
- B22D2/006—Arrangement of indicating or measuring devices, e.g. for temperature or viscosity of the fused mass for the temperature of the molten metal
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- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
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Abstract
The invention belongs to the technical field of metal casting, and particularly relates to a continuous casting crystallizer bleed-out forecasting method which is intrinsically safe, reliable in result and higher in test precision, and has a wider application prospect in the field of steel temperature measurement. Firstly, determining the arrangement scheme and the arrangement quantity of fiber gratings, slotting at a specific position of a crystallizer copper plate, processing the gratings on the optical fibers, manufacturing fiber grating sensors, then installing and fixing the fiber grating sensors in the slots at the specific position of the crystallizer copper plate, after the steps are completed, installing the crystallizer, starting casting work, emitting laser, processing signals acquired by the fiber grating sensors into temperature signals through a fiber grating demodulator, and placing the obtained temperature signals in a breakout prediction model, thereby achieving the purpose of forecasting the breakout of the crystallizer.
Description
Technical Field
The invention relates to the technical field of metal casting, in particular to a method for forecasting bleed-out of a continuous casting crystallizer.
Background
The crude steel yield in China already reaches billions of tons, and the proportion of steel solidified in the continuous casting process even reaches more than 99 percent. The crystallizer is used as the heart of a continuous casting machine, plays a role in solidifying molten steel for the first time to form a steel shell in a steelmaking process, the quality of the steel shell solidified in the crystallizer directly determines the quality and the performance of a casting blank and even steel, if the crystallizer process has problems, the casting blank can generate surface defects, and even steel leakage accidents can be caused. Once the breakout accident of the crystallizer occurs, the shutdown of the whole steelmaking process and the damage of equipment can be caused, and even casualty accidents can be caused.
In order to reduce the breakout accident of the crystallizer, metallurgical researchers indirectly reflect the working state of the billet inside the crystallizer by researching and developing a crystallizer breakout prediction system, and find the problems of cracks, bonding and the like in advance. At present, almost all crystallizer breakout prediction models adopt a thermocouple temperature measurement mode to measure the temperature of a cold surface of a crystallizer, and then the results and model calculation are used for calculating the temperature of a blank shell of a hot surface of the crystallizer. Due to the structural limitation of the crystallizer copper plate, the thermocouples can only be arranged perpendicular to the copper plate, and in order to keep the strength characteristic of the copper plate, the thermocouples can only be arranged inside the original fastening expansion bolt, so that the complicated structural design greatly increases the production cost. In addition, for the accuracy of the model, more than 100 thermocouples are generally arranged on the conventional slab, after long-time work, part of the thermocouples are easy to damage, and the damage of one measuring point can cause large errors of nearby model results and even false alarm conditions, so that once a steel mill takes relevant remedial measures, the production rhythm is seriously influenced. In addition, the thermocouple sensor is extremely susceptible to electromagnetic interference generated by the electromagnetic stirrer of the crystallizer. Therefore, the development of a novel temperature measurement means for predicting the breakout of the crystallizer, which is simple, low in cost and strong in anti-interference capability, is very important.
The fiber grating temperature measurement technology is used for measuring the temperature by utilizing the principle that ultraviolet laser beams irradiate optical fibers, and the refractive index of fiber cores in the irradiated sections changes periodically, and the method is free from electromagnetic interference; one optical fiber is provided with a plurality of measuring points, so that the installation cost can be greatly reduced, and more dense temperature measuring points can be arranged as required; the arrangement of the optical fiber has no influence on the strength of the crystallizer copper plate because the diameter of the optical fiber is only about 1 millimeter. In conclusion, the fiber bragg grating temperature measurement technology is a novel and promising temperature measurement technology for crystallizer bleed-out prediction.
An idea of using fiber measurement in a crystallizer is disclosed in CN102089095A, and an arrangement idea is given, but no mention is made about the manufacturing method of the optical fiber, and specific arrangement parameters are given. In CN114077011, a manufacturing method for temperature measuring optical fiber of crystallizer is disclosed, but no specific arrangement parameters are given. Meanwhile, patents CN106706075A, CN112935213A, and CN114012053A disclose the application of fiber bragg grating in the measurement of the liquid level height of molten steel in the mold and the judgment of the mold nozzle nodulation state, but there is no report of fiber bragg grating in the mold bleed-out prediction.
Disclosure of Invention
The invention mainly aims to provide a method for forecasting the steel leakage of a continuous casting crystallizer, which can greatly simplify the arrangement of a temperature measuring device of the crystallizer, improve the accuracy of forecasting the steel leakage of the crystallizer and reduce the production cost.
To solve the above technical problem, according to an aspect of the present invention, the present invention provides the following technical solutions:
a method for forecasting bleed-out of a continuous casting crystallizer comprises the following steps:
s1, determining the number of arrangement columns of the fiber bragg grating in the transverse direction of the crystallizer copper plate according to the arrangement of the crystallizer copper plate, the requirements of a breakout prediction model and the arrangement of thermocouples of an original model;
s2, slotting at a specific position of a crystallizer copper plate;
s3, determining the number of lines of temperature measuring points arranged on the crystallizer copper plate along the blank drawing direction of the grating optical fiber according to the requirements of the breakout prediction model;
s4, obtaining the total number of the temperature measuring points of the fiber bragg grating according to the determined column number and row number in the steps S1 and S3;
s5, processing a grating on the optical fiber according to the total number of the temperature measuring points of the optical fiber grating obtained in the step S4, and manufacturing an optical fiber grating sensor;
s6, mounting and fixing the fiber grating sensor manufactured in the step S5 in the groove in the step S2;
s7, after the steps are completed, installing a crystallizer, starting casting work, emitting laser, and processing signals acquired by the fiber grating sensor into temperature signals through a fiber grating demodulator;
s8, the temperature signal obtained in the step S7 is placed in a breakout prediction model, and breakout prediction of the crystallizer is achieved.
The preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: the method for forecasting the breakout of the continuous casting crystallizer also comprises the following steps,
and S9, calculating the temperature of the casting blank in contact with the hot surface of the crystallizer according to the model, and forming a cloud picture so as to observe the hot spot area more intuitively.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the step S1, the first step is performed,
the transverse arrangement density of the fiber bragg grating in the crystallizer copper plate is not less than that of the original model thermocouple.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the above-mentioned step S2, the step,
slotting at a specific position of the copper plate of the crystallizer, wherein the specific position is any protruding position between two cooling water seams, and preferably slotting at the central position of the protruding position;
and (4) slotting at a specific position of the copper plate of the crystallizer, wherein the specific position is vertical to the throwing direction.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the above-mentioned step S3, the user can select,
the number of the rows of the temperature measuring points of the fiber bragg grating arranged on the crystallizer copper plate along the throwing direction is not less than that of the prototype thermocouple.
The preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the above-mentioned step S4, the step,
the total number of the temperature measuring points of the fiber bragg grating is not less than the number of the prototype thermocouples;
preferably, the total number of temperature measurement points of the fiber grating is between 15 and 500.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the step S5, the first step is performed,
all grating sensors can be processed on one optical fiber, and the grating sensors can also be processed on a plurality of optical fibers.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the step S6, the process is performed,
when the fiber grating sensor is installed, the bending part is realized in a circular arc form, and the radius of the circular arc is between 5mm and 30 mm.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the above-mentioned step S8, the step,
when the temperature curves of the upper row and the lower row are successively heated up and the interval time is equal to the grating distance divided by the pulling speed, generating a pre-alarm signal;
when the temperature curve of the second row is crossed with the temperature curve of the first row, the pre-alarm signal is strengthened;
when the continuous three-line temperature curves are crossed, the pre-alarm signal is further strengthened;
when different gratings in the same line with the initial temperature change have temperature amplification in different degrees at the same time, the pre-alarm signal is strengthened again.
The preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the step S8, when the forecast condition of the step S8 is satisfied, an alarm signal is formally generated.
The invention has the following beneficial effects:
the invention provides a continuous casting crystallizer bleed-out forecasting method, which comprises the steps of determining the arrangement scheme and the arrangement number of fiber gratings, slotting at a specific position of a crystallizer copper plate, processing the gratings on optical fibers, manufacturing fiber grating sensors, installing and fixing the fiber grating sensors in the slots at the specific position of the copper plate, installing the crystallizer after the steps are finished, starting casting work, emitting laser, processing signals acquired by the fiber grating sensors into temperature signals through a fiber grating demodulator, and placing the temperature signals into a bleed-out forecasting model, thereby achieving the purpose of forecasting the bleed-out of the crystallizer. The method is intrinsically safe, reliable in result and higher in test precision, and has wider application prospect in the field of steel temperature measurement.
Drawings
In order to more clearly illustrate the embodiments or technical solutions of the present invention, the drawings used in the embodiments or technical solutions of the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the structures shown in the drawings without creative efforts.
FIG. 1 is a plan view of the fiber grating of the present invention disposed in a mold copper plate;
FIG. 2 is a sectional view of the arrangement of the fiber grating of the present invention in the mold copper plate;
FIG. 3 is a second plan view of the fiber grating of the present invention in a mold copper plate;
FIG. 4 is a breakout predicted heat cloud map interface obtained by thermocouple temperature measurement according to the present invention;
FIG. 5 is a thermal cloud diagram interface of breakout prediction obtained by fiber grating temperature measurement according to the present invention.
FIG. 6 is a third layout of fiber gratings in a mold copper plate according to the present invention;
FIG. 7 is a sectional view of a third arrangement of the fiber grating of the present invention in a mold copper plate;
FIG. 8 is a temperature curve result obtained by fiber grating temperature measurement according to the present invention;
the device comprises a crystallizer liquid level line 1, a bolt 2, a fiber grating sensor 3, a protective sleeve 31, an optical fiber 32, a water gap 4, a crystallizer copper plate 5, a fiber grating demodulator 6 and a grating fixing material 7.
The implementation, functional features and advantages of the objects of the present invention will be further explained with reference to the accompanying drawings.
Detailed Description
The following will clearly and completely describe the technical solutions in the embodiments, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all embodiments. All other embodiments, which can be obtained by a person skilled in the art without inventive step based on the embodiments of the present invention, are within the scope of protection of the present invention.
The invention provides a method for forecasting bleed-out of a continuous casting crystallizer, which has the following advantages:
1) And (3) intrinsic safety: the fiber grating is a passive optical device and does not need power supply.
2) High reliability: the fiber grating temperature sensor is only sensitive to temperature, so the fiber grating temperature sensor has the characteristics of no false alarm and no missing alarm.
3) High stability: measurement accuracyThe measurement sensitivity is 0.1 ℃ at +/-2 ℃, and the absolute value is measured, and the detection value is 10 -6 ~10 -2 Wavelength information of four-order linear response, fluctuation of light source intensity, random fluctuation caused by optical fiber microbending effect, coupling loss and line loss do not influence measurement accuracy and sensitivity;
4) Strong anti-electromagnetic interference: the optical fiber only transmits light and is not conductive, and optical signals are not influenced by an electromagnetic field, so that the optical fiber has strong resistance to electromagnetic interference and industrial interference;
5) Long service life: the key devices conform to ITU standards, and stable and reliable operation of the system for 10 years can be guaranteed.
The method is intrinsically safe, reliable in result and higher in test precision, and has wider application prospect in the field of steel temperature measurement. Firstly, determining the arrangement scheme and the arrangement quantity of fiber gratings, slotting at a specific position of a crystallizer copper plate, processing the gratings on the fibers, manufacturing fiber grating sensors, installing and fixing the fiber grating sensors in the slots at the specific position of the copper plate, after the steps are finished, installing the crystallizer, starting casting, emitting laser, processing signals acquired by the fiber grating sensors into temperature signals through a fiber grating demodulator, and placing the obtained temperature signals in a breakout prediction model, thereby achieving the purpose of forecasting the breakout of the crystallizer.
According to one aspect of the invention, the invention provides the following technical scheme:
a method for forecasting bleed-out of a continuous casting crystallizer comprises the following steps:
s1, determining the number of arrangement columns of the fiber bragg gratings in the transverse direction of the crystallizer copper plate 5 according to the arrangement of the crystallizer copper plate 5, the requirements of a breakout prediction model and the arrangement of thermocouples of an original model;
s2, slotting at a specific position of a crystallizer copper plate 5;
s3, determining the number of lines of temperature measuring points arranged on the crystallizer copper plate 5 along the blank drawing direction of the grating optical fiber according to the requirements of the breakout prediction model;
s4, obtaining the total number of the temperature measuring points of the fiber bragg grating according to the determined column number and row number in the steps S1 and S3;
s5, processing a grating on the optical fiber 32 according to the total number of the temperature measuring points of the fiber grating obtained in the step S4, and manufacturing a fiber grating sensor 3;
s6, mounting and fixing the fiber grating sensor 3 manufactured in the step S5 in the groove in the step S2;
s7, after the steps are completed, installing a crystallizer, starting casting work, emitting laser, and processing signals acquired by the fiber grating sensor 3 into temperature signals through the fiber grating demodulator 6;
s8, placing the temperature signal obtained in the step S7 in a breakout prediction model to realize breakout prediction of the crystallizer;
and S9, calculating the temperature of the casting blank in contact with the hot surface of the crystallizer according to the model, and forming a cloud picture so as to observe the hot spot area more intuitively.
The preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the above-mentioned step S1, the first step,
the transverse arrangement density of the fiber bragg grating in the crystallizer copper plate 5 is not less than that of the original model thermocouple;
the transverse arrangement column number of the optical fiber grating in the crystallizer copper plate 5 can be integral multiples of the transverse arrangement column number of the original model thermocouple, namely 1 time, 2 times, 3 times of 8230, N times and the like;
the number of the arrangement lines of the fiber bragg gratings in the transverse direction of the crystallizer copper plate 5 is between 5 and 30; specifically, the number of the fiber gratings arranged in the transverse direction of the mold copper plate 5 is, for example, but not limited to, 5, 6, 7, 8, 9, 10, 12, 15, 18, 20, 25, 30 or a range between any two of them;
the row spacing of the fiber bragg grating in the transverse direction of the crystallizer copper plate 5 is 50mm to 400mm; specifically, the column pitch of the fiber grating in the transverse direction of the mold copper plate 5 is, for example, but not limited to, any one of 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, 350mm, 400mm or a range between any two of them;
the invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the step S2, the first step is performed,
slotting at a specific position of the crystallizer copper plate 5, wherein the specific position is any protruding position between the two cooling water seams 4, and preferably slotting at the central position of the protruding position;
slotting at a specific position of a crystallizer copper plate 5, wherein the specific position is vertical to a throwing direction;
the depth of the slot is required to be 1 to 2 optical fiber diameters deeper than the depth of the water gap 4; the width of the slot conforms to the outer diameter of the optical fiber.
The distance between the deepest part of the slot and the hot surface of the crystallizer is not less than 20mm, so that the heat transfer effect of the crystallizer is not damaged, and the mechanical property of the crystallizer can be maintained;
the preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the above-mentioned step S3, the user can select,
the number of the arranged temperature measuring points of the fiber bragg grating on the crystallizer copper plate 5 along the throwing direction is not less than the number of the arranged temperature measuring points of the prototype thermocouple;
the number of rows of temperature measuring points of the fiber bragg grating arranged on the crystallizer copper plate 5 along the throwing direction is not less than 3; specifically, the number of rows of temperature measuring points of the fiber grating arranged on the crystallizer copper plate 5 along the drawing direction is 3, 4, 5, 6, 7, 8, 9, 10 \8230; and any one of N.
The distance between every two lines is 50mm-300 mm; specifically, each row spacing is, for example, but not limited to, any one of 50mm, 100mm, 150mm, 200mm, 250mm, 300mm, or a range between any two;
the invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the above-mentioned step S4, the step,
the total number of the temperature measuring points of the fiber bragg grating is not less than the number of the prototype thermocouples;
preferably, the total number of the fiber grating temperature measurement points is between 15 and 500, more preferably, the total number of the fiber grating temperature measurement points is between 50 and 450, and even more preferably, the total number of the fiber grating temperature measurement points is between 100 and 400.
The preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the above-mentioned step S5, the step,
all grating sensors can be processed on one optical fiber, and the grating sensors can also be processed on a plurality of optical fibers;
in order to protect the optical fiber 32, a protective sleeve 31 can be sleeved outside the optical fiber 32, and the protective sleeve can be made of metal, ceramic, glass fiber and the like;
the diameter of the optical fiber of the protective sleeve with the protective sleeve is between 0.5mm and 5 mm; specifically, the diameter of the optical fiber 32 of the protective tape sleeve 31 is, for example, but not limited to, any one of 0.5mm, 1.0mm, 1.5mm, 2.0mm, 2.5mm, 3.0mm, 3.5mm, 4.0mm, 4.5mm, 5.0mm, or a range between any two of them;
the preferable scheme of the method for forecasting the breakout of the continuous casting crystallizer is as follows: in the step S6, the process is performed,
when the fiber grating sensor 3 is installed, the bending part is realized in an arc shape, and the arc radius is between 5mm and 30 mm; specifically, the radius of the circular arc is, for example, but not limited to, any one of 5mm, 10mm, 15mm, 20mm, 25mm, 30mm or a range between any two of the two; the grating is fixed by filling grating fixing materials 7 such as resin, silica gel and the like in the groove, so that the stability of the grating is ensured.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the above-mentioned step S8, the step,
when the temperature curves of the upper line and the lower line are successively heated and the interval time is equal to the grating distance divided by the pulling speed, generating a pre-alarm signal;
when the second row temperature curve is crossed with the first row temperature curve, the pre-alarm signal is strengthened;
when the continuous three rows of temperature curves are crossed, the pre-alarm signal is further strengthened;
when different gratings in the same line with the initial temperature change have temperature amplification in different degrees at the same time, the pre-alarm signal is strengthened again.
The invention relates to a preferable scheme of a continuous casting crystallizer breakout prediction method, wherein: in the step S8, when the forecast condition of the step S8 is satisfied, an alarm signal is formally generated.
The technical solution of the present invention is specifically described below with reference to specific examples.
Example 1
The position of the crystallizer liquid line 1 is shown in fig. 1, the arrangement of the original model thermocouples is shown in the position of the bolt 2 in fig. 1, the thermocouples are arranged in the upper 3 rows and the middle 10 columns of the position of the bolt 2 shown in fig. 1, so that in order to improve the accuracy of the model, the number of the columns is determined to be 11, and the number of the rows is kept unchanged. And (3) slotting at the corresponding position of the copper plate of the crystallizer, wherein the width of the slotting is 1mm, and as shown in figure 2, the depth of the slotting is 2mm deeper than that of the water gap 4. The distance between every two temperature measuring points is 150mm, the total number of the gratings is 30, and the gratings are arranged as shown by lines in figure 1. The metal protective sleeve 31 is sleeved outside the optical fiber 32 and fixed by resin, the crystallizer is installed, the casting operation is started, the laser is emitted, the collected signal is processed into a temperature signal through the fiber grating demodulator 6, and the obtained temperature signal is placed in the breakout prediction model, so that the purpose of continuous casting crystallizer breakout prediction is achieved.
Example 2
The arrangement of the original model thermocouples is shown in fig. 1 by the position of the bolt 2, and the thermocouples are arranged in the upper 3 rows and the middle 10 columns of the position of the bolt 2 shown in fig. 1, so in order to improve the accuracy of the model, the number of columns is determined to be 22, and the number of rows is kept unchanged. And (3) grooving at the corresponding position of the crystallizer copper plate, wherein the width of the grooving is 0.5mm, and the depth of the grooving is 1mm deeper than the depth of the water gap 4. The distance between every two temperature measuring points is 100mm, the total number of the gratings is 60, and the gratings are arranged as shown by lines in figure 3. The ceramic protective sleeve 31 is sleeved outside the optical fiber 32 and fixed by resin, the crystallizer is installed, the casting operation is started, the laser is emitted, the collected signal is processed into a temperature signal through the fiber grating demodulator 6, and the obtained temperature signal is placed in the breakout prediction model, so that the purpose of continuous casting crystallizer breakout prediction is achieved. The hot spot cloud chart result of the original breakout prediction model is shown in fig. 4, the hot spot cloud chart result of the original breakout prediction model has obvious edges and corners, the result accuracy is low, the hot spot cloud chart result of the improved model is shown in fig. 5, the model result is smooth, and the accuracy is improved.
Example 3
The arrangement of the original model thermocouples is shown in fig. 1 at the position of the bolt 2, and the thermocouples are arranged in the upper 3 rows and the middle 10 columns of the position of the bolt 2 shown in fig. 1, so that in order to improve the accuracy of the model, the present embodiment determines the number of columns to be 22 and the number of rows to be 11. And (3) slotting at the corresponding position of the crystallizer copper plate 5, wherein the width of the slotting is 0.9mm, and the depth of the slotting is 1.5mm deeper than the depth of the water gap. The distance between each row of temperature measuring points is 125mm, the total number of the gratings is 242, and the gratings are arranged as shown by lines in figures 6 and 7. The fiber 32 is sheathed with a glass fiber protective sleeve 31 and fixed by silica gel, a crystallizer is installed, casting operation is started, laser is emitted, the acquired signal is processed into a temperature signal by a fiber grating demodulator 6, and the obtained temperature signal is placed in a breakout prediction model, so that the purpose of continuous casting crystallizer breakout prediction is achieved.
Example 4
For the crystallizer of the previous breakout prediction model, the present example determines the number of columns to be 22 and the number of rows to be 5. And (3) slotting at the corresponding position of the crystallizer copper plate 5, wherein the width of the slotting is 1.5mm, and the depth of the slotting is 2mm deeper than the depth of the water gap. The distance between every two temperature measuring points is 150mm, and the total number of the gratings is 110. A metal protective sleeve 31 is sleeved outside an optical fiber 32, resin is used for fixing, a crystallizer is installed, casting work is started, laser is emitted, collected signals are processed into temperature signals through an optical fiber grating demodulator 6, the obtained temperature signals are placed in a breakout prediction model, temperature change curves are shown in figure 8, temperature curves in a column are raised one by one, the time difference of the raising corresponds to the time obtained by dividing the position by the pulling speed, the curves are intersected in sequence, the curves a, b and c are thermocouple temperature measurement results, when the temperature curves a, b and c are simultaneously raised, the interval time equals to the distance of a measuring point divided by the pulling speed, the temperature curve b is intersected with the temperature curve a, and the temperature curves a, b and c in three continuous rows are intersected, the model for thermocouple temperature measurement is at the highest point of the curve b (t is 1 Time of day) to generate an alarm signal; the temperature curves d and e are newly added temperature curves of the fiber grating breakout prediction model, and the prediction logics adopted by the temperature curves d and e are the same, so that the fiber grating is at the highest temperature point (t) of the curve d 2 Time of day) to generate alarm signal, the fiber grating canObviously, an alarm is generated in advance, so that the operators can perform corresponding speed reduction operation in advance, the early prediction of the continuous casting crystallizer bleed-out is realized, and the risk of the continuous casting crystallizer bleed-out is reduced.
The above description is only a preferred embodiment of the present invention, and is not intended to limit the scope of the present invention, and all equivalent structural changes made by using the content of the present specification or other related technical fields within the spirit of the present invention are included in the scope of the present invention.
Claims (6)
1. A method for forecasting breakout of a continuous casting crystallizer is characterized by comprising the following steps:
s1, determining the number of arrangement columns of the fiber bragg grating in the transverse direction of the crystallizer copper plate according to the arrangement of the crystallizer copper plate, the requirements of a breakout prediction model and the arrangement of thermocouples of an original model;
s2, slotting at a specific position of a crystallizer copper plate; the special position is any protruding position between the two cooling water seams and is vertical to the blank drawing direction;
s3, determining the number of lines of temperature measuring points of the optical fiber grating in the crystallizer copper plate along the throwing direction according to the requirements of the breakout prediction model;
s4, obtaining the total number of the temperature measuring points of the fiber bragg grating according to the determined column number and row number in the steps S1 and S3;
s5, processing a grating on the optical fiber according to the total number of the temperature measuring points of the optical fiber grating obtained in the step S4, and manufacturing an optical fiber grating sensor;
s6, mounting and fixing the fiber grating sensor manufactured in the step S5 in the groove in the step S2, wherein the bending part is realized in a circular arc form when the fiber grating sensor is mounted, and the radius of the circular arc is between 5mm and 30 mm;
s7, after the steps are completed, installing a crystallizer, starting casting work, emitting laser, and processing signals acquired by the fiber grating sensor into temperature signals through a fiber grating demodulator;
s8, placing the temperature signal obtained in the step S7 in a breakout prediction model to realize breakout prediction of the crystallizer; in the step S8, the process is performed,
when the temperature curves of the upper line and the lower line are successively heated and the interval time is equal to the grating distance divided by the pulling speed, generating a pre-alarm signal;
when the temperature curve of the second row is crossed with the temperature curve of the first row, the pre-alarm signal is strengthened;
when the continuous three rows of temperature curves are crossed, the pre-alarm signal is further strengthened;
when different gratings in the same line with the initial temperature change have temperature amplification of different degrees at the same time, the pre-alarm signal is strengthened again;
and when the forecasting conditions of the step S8 are met, generating an alarm signal formally.
2. The method for forecasting the breakout of a continuous casting mold according to claim 1, further comprising,
and S9, calculating the temperature of the casting blank in contact with the hot surface of the crystallizer according to the model, and forming a cloud picture so as to observe the hot spot area more intuitively.
3. The method for forecasting the breakout of the continuous casting crystallizer according to claim 1 or 2, characterized in that in the step S1, the arrangement density of the fiber bragg grating in the horizontal direction of the copper plate of the crystallizer is not less than the arrangement density of the thermocouple in the original model.
4. The method for forecasting the breakout of the continuous casting mold according to claim 1 or 2, wherein in the step S3, the number of the arranged temperature measuring points of the fiber bragg grating on the mold copper plate along the casting direction is not less than the number of the arranged rows of the prototype thermocouples.
5. The method for forecasting the breakout of the continuous casting mold according to claim 1 or 2, wherein in the step S4, the total number of the temperature measuring points of the fiber bragg grating is between 15 and 500.
6. The method for forecasting breakout of a continuous casting mold according to claim 1 or 2, wherein in step S5, all grating sensors are processed on one optical fiber or grating sensors are processed on a plurality of optical fibers.
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