CN114012053A - Method for judging nodulation and blockage abnormal state of submerged nozzle of crystallizer - Google Patents
Method for judging nodulation and blockage abnormal state of submerged nozzle of crystallizer Download PDFInfo
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- 230000024121 nodulation Effects 0.000 title claims abstract description 67
- 238000000034 method Methods 0.000 title claims abstract description 56
- 230000002159 abnormal effect Effects 0.000 title claims abstract description 47
- 239000007788 liquid Substances 0.000 claims abstract description 98
- 238000010586 diagram Methods 0.000 claims abstract description 42
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 36
- 239000010959 steel Substances 0.000 claims abstract description 36
- 238000012544 monitoring process Methods 0.000 claims abstract description 5
- 238000009749 continuous casting Methods 0.000 claims description 62
- 239000013307 optical fiber Substances 0.000 claims description 33
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims description 17
- 229910052802 copper Inorganic materials 0.000 claims description 17
- 239000010949 copper Substances 0.000 claims description 17
- 238000007654 immersion Methods 0.000 claims description 7
- 238000001514 detection method Methods 0.000 abstract description 4
- 238000009529 body temperature measurement Methods 0.000 description 35
- 238000004519 manufacturing process Methods 0.000 description 17
- 238000005266 casting Methods 0.000 description 14
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- 238000004590 computer program Methods 0.000 description 10
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- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 4
- 230000000694 effects Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 3
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- 238000005259 measurement Methods 0.000 description 3
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- 238000009628 steelmaking Methods 0.000 description 3
- 230000000007 visual effect Effects 0.000 description 3
- PNEYBMLMFCGWSK-UHFFFAOYSA-N aluminium oxide Inorganic materials [O-2].[O-2].[O-2].[Al+3].[Al+3] PNEYBMLMFCGWSK-UHFFFAOYSA-N 0.000 description 2
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- 238000007711 solidification Methods 0.000 description 1
- 230000008023 solidification Effects 0.000 description 1
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- 229910001845 yogo sapphire Inorganic materials 0.000 description 1
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- 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
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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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- G—PHYSICS
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Abstract
The invention relates to a method for judging an abnormal nodulation and blockage state of a submerged nozzle of a crystallizer, which comprises the following steps: measuring temperature values of a plurality of temperature measuring points on the crystallizer; according to the temperature values at the temperature measuring points, obtaining an isotherm diagram in the crystallizer; determining the liquid level position of molten steel in the crystallizer according to the isotherm diagram, and monitoring the fluctuation condition of the liquid level; and determining the nodulation position and the blockage degree of the crystallizer according to the fluctuation condition of the liquid level. The invention solves the technical problems that the nodulation and blockage conditions of the submerged nozzle of the crystallizer cannot be detected on line and the detection accuracy is low.
Description
Technical Field
The invention relates to the field of steelmaking continuous casting production, in particular to a method for judging an abnormal nodulation and blockage state of a submerged nozzle of a crystallizer.
Background
The crystallizer is the most important part in the continuous casting production of steel making, molten steel is cooled to form a billet shell, a continuous casting machine is supported to perform billet drawing, impurities in the molten steel are effectively removed through the processes of electromagnetic stirring and the like, and a casting billet with good quality is formed.
The prior steelmaking continuous casting molten steel is injected into a crystallizer through a submerged nozzle, and the flowing condition of the molten steel in the crystallizer directly influences heat transfer, mass transfer and molten steel solidification; the flowing condition of the molten steel in the crystallizer can directly influence the fluctuation of the liquid level of the molten steel in the crystallizer (under the normal state, the amplitude and the flow speed of the fluctuation of the liquid level of the molten steel in the crystallizer are relatively stable). However, during casting, molten steel passes through the submerged nozzle of the mold and reacts with the nozzle wall to produce Al2O3The (alumina) based particles are enriched and adsorbed at the outlet position of the submerged nozzle or form a nodule in the inner cavity of the submerged nozzle through the flowing of the molten steel.
Once the nodulation occurs, the nodulation position absorbs sinter impurities, steel-containing impurities and the like, the nodulation process is accelerated, and the nozzle is blocked in a serious condition. In addition, the formation of the accretion can cause the molten steel to generate bias flow in the inner cavity of the submerged nozzle, so as to form a self-acceleration effect, further accelerate the accumulation of a cold steel inclusion layer, cause the vortex phenomenon of the flowing of the molten steel even if the nozzle is not blocked, directly influence the quality of a casting blank, and cause the quality defects of the casting blank such as slag entrapment bubbles and the like; if the accretion is serious, the quality defect of a casting blank can be caused, and if a water gap is blocked, the casting stop and the production stop can be caused, so that huge economic loss is caused.
At present, whether the crystallizer is in an abnormal state or not can be judged only by measuring the liquid level position in the crystallizer, and the measurement of the liquid level position and the temperature of the crystallizer mainly depends on a sensor (such as a thermocouple sensor) and is limited by the structural limitation of the sensor, so that the defects of small measurement area, low measurement accuracy and the like exist, and detailed thermal field and real-time liquid level data in the crystallizer cannot be given; in addition, although various methods can detect the nodulation and blockage of the submerged nozzle of the crystallizer at present, the method is mostly used for off-line detection, and not only cannot be used for on-line guiding production, but also cannot judge the nodulation or blockage position, and has poor using effect. Therefore, no good method for online detection and judgment of the nodulation and blockage of the crystallizer submerged nozzle exists at present.
Aiming at the problems that the nodulation and the blockage of a crystallizer submerged nozzle cannot be detected on line and the detection accuracy is low in the related technology, an effective solution is not provided at present.
Therefore, the inventor provides a method for judging the abnormal state of the clogging of the submerged nozzle of the crystallizer by the experience and practice of the related industry for many years, so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide a method for judging the nodulation and blockage abnormal state of a submerged nozzle of a crystallizer, which can obtain a more accurate temperature field than the temperature measurement of a traditional thermocouple by measuring the temperature through a plurality of optical fiber temperature sensors arranged on a continuous casting crystallizer so as to obtain the specific shape and the flowing condition of the liquid level of molten steel in the crystallizer, accurately judge whether the submerged nozzle of the crystallizer and the interior of the submerged nozzle of the crystallizer are blocked due to the nodulation by applying a model algorithm, remind field personnel to replace the nozzle in time and avoid the occurrence of casting stop or quality defects.
The purpose of the invention can be realized by adopting the following technical scheme:
the invention provides a method for judging an abnormal nodulation and blockage state of a submerged nozzle of a crystallizer, which comprises the following steps of:
measuring temperature values of a plurality of temperature measuring points on the crystallizer;
according to the temperature values at the temperature measuring points, obtaining an isotherm diagram in the crystallizer;
determining the liquid level position of the molten steel in the crystallizer according to the isothermal map, and monitoring the fluctuation condition of the liquid level;
and determining the nodulation position and the blockage degree of the crystallizer according to the fluctuation condition of the liquid level.
In a preferred embodiment of the present invention, the measuring the temperatures of a plurality of temperature measuring points on the mold includes:
a plurality of temperature measuring holes are uniformly arranged on a wide-surface copper plate of the continuous casting crystallizer at intervals;
temperature measuring optical fibers are respectively arranged in the temperature measuring holes, so that the temperature measuring optical fibers are completely embedded in the continuous casting crystallizer;
a plurality of gratings are formed on each temperature measuring optical fiber to form the temperature measuring point;
and the temperature measuring optical fibers respectively collect the temperature of each temperature measuring point.
In a preferred embodiment of the present invention, the distance between two adjacent temperature measuring points is greater than or equal to 5 mm.
In a preferred embodiment of the present invention, the obtaining an isotherm diagram in the mold according to the temperature value at each temperature measuring point includes:
forming a temperature field in the crystallizer according to the temperature value of each temperature measuring point;
and obtaining an isotherm diagram of the temperature field according to the temperature field.
In a preferred embodiment of the present invention, the determining the position of the nodule and the degree of clogging of the mold according to the fluctuation of the liquid level includes:
if the position of the peak point of the liquid level fluctuation deviates to the central position of the inner cavity of the submerged nozzle of the crystallizer and the amplitude of the liquid level fluctuation is reduced, the inner cavity of the submerged nozzle of the crystallizer has a nodulation phenomenon.
In a preferred embodiment of the present invention, the determining the position of the nodule and the degree of clogging of the mold according to the fluctuation of the liquid level includes:
if the position of the peak point of the liquid level fluctuation is unchanged and the amplitude of the liquid level fluctuation is increased, serious nodulation occurs at the outlet of the submerged nozzle of the crystallizer.
In a preferred embodiment of the present invention, the determining the position of the nodule and the degree of clogging of the mold according to the fluctuation of the liquid level includes:
if the liquid level is in asymmetric fluctuation, unilateral nodulation occurs in an inner cavity of an immersion nozzle of the crystallizer or an outlet of the immersion nozzle of the crystallizer.
In a preferred embodiment of the present invention, the obtaining an isotherm diagram in the mold according to the temperature value at each temperature measuring point includes:
and respectively obtaining a connection curve of the temperature values on the temperature measuring points in a normal state and a connection curve of the temperature values on the temperature measuring points in a nodulation state through a model algorithm.
In a preferred embodiment of the present invention, a high-order fitting is performed on the temperature values at the temperature measurement points in the normal state and the temperature values at the temperature measurement points in the nodule state, respectively, so as to obtain fitting curves of the temperature values at the temperature measurement points in the normal state and the temperature values at the temperature measurement points in the nodule state, respectively.
In a preferred embodiment of the present invention, cubic B-spline interpolation processing is performed on the temperature value at each temperature measurement point in the normal state and the temperature value at each temperature measurement point in the nodule state, respectively, to obtain an interpolation curve of the temperature value at each temperature measurement point in the normal state and the temperature value at each temperature measurement point in the nodule state, respectively.
In a preferred embodiment of the present invention, the characteristic value of the liquid level is extracted through the curve;
the characteristic value includes a fluctuation speed of the liquid level and an amplitude of a peak point position of the liquid level fluctuation.
From the above, the method for judging the abnormal state of the nodulation and blockage of the submerged nozzle of the crystallizer has the characteristics and advantages that: the continuous casting crystallizer is provided with a plurality of temperature measuring points, and the temperature values of the temperature measuring points are respectively measured through the temperature measuring optical fibers, so that a more accurate temperature field can be formed compared with the existing couple temperature measurement, a high-precision temperature field in the crystallizer can be obtained, the temperature difference between liquid slag and molten steel in the crystallizer enables the intersection position of the liquid slag and the molten steel to have obvious temperature change, an isotherm diagram in the crystallizer can be obtained according to the temperature values of the temperature measuring points, the liquid level position of the molten steel in the crystallizer can be determined according to the isotherm diagram, the shape and fluctuation condition of the liquid level can be monitored in real time, various parameters of the liquid level state can be further obtained, and the purpose of judging the nodulation position and the blockage degree of the crystallizer can be achieved. The invention can provide visual real-time images for on-site production, predict nodulation or blockage, alarm when the nodulation or the blockage has great influence on the production, remind on-site operators to replace a water gap in time, effectively avoid casting stop or quality defects, improve casting quality and ensure efficient and stable production.
Drawings
The drawings are only for purposes of illustrating and explaining the present invention and are not to be construed as limiting the scope of the present invention.
Wherein:
FIG. 1: is one of the flow charts of the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 2: the second flow chart of the method for determining the clogging abnormal state of the submerged nozzle of the crystallizer of the present invention is shown.
FIG. 3: the third flow chart of the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer is disclosed.
FIG. 4: the invention relates to a device structure block diagram of a method for judging the nodulation and blockage abnormal state of a submerged nozzle of a crystallizer.
FIG. 5: the second device structure block diagram of the method for determining the clogging abnormal state of the submerged nozzle of the crystallizer of the present invention.
FIG. 6: the invention relates to a method for judging the nodulation and blockage abnormal state of a submerged nozzle of a crystallizer, which is a setting position diagram of each temperature measuring optical fiber.
FIG. 7: the method is a temperature field isotherm diagram in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 8: is one of the liquid level fluctuation diagrams in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 9: the second schematic diagram of liquid level fluctuation in the method for determining the clogging abnormal state of submerged nozzle of crystallizer of the present invention.
FIG. 10: the third schematic diagram of liquid level fluctuation in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer is shown.
FIG. 11: the method is a schematic diagram for performing high-order fitting on data in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 12: the invention is a schematic diagram of cubic B-spline interpolation processing on data in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 13: the invention is a schematic diagram of the overall fluctuation speed of the liquid level in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 14: the invention is a schematic diagram of the amplitude of the position of the peak point on the left side of the liquid level in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 15: the invention is a schematic diagram of the mild nodulation phenomenon of the inner cavity of the submerged nozzle of the crystallizer in the method for judging the abnormal nodulation blockage state of the submerged nozzle of the crystallizer.
FIG. 16: the invention is a schematic diagram of the serious nodulation phenomenon of the inner cavity of the submerged nozzle of the crystallizer in the method for judging the nodulation blockage abnormal state of the submerged nozzle of the crystallizer.
FIG. 17: the invention is a schematic diagram of the serious nodulation phenomenon at the submerged nozzle of the crystallizer in the method for judging the abnormal nodulation blockage state of the submerged nozzle of the crystallizer.
FIG. 18: the invention is a schematic diagram of the unilateral nodulation phenomenon of the crystallizer in the method for judging the nodulation blockage abnormal state of the submerged nozzle of the crystallizer.
The reference numbers in the invention are:
10. a temperature measuring unit; 20. An isotherm determination unit;
21. a temperature field forming module; 22. An isotherm determination module;
30. a liquid level determination unit; 40. A judgment unit;
1. a continuous casting crystallizer; 2. A temperature measuring optical fiber;
3. an inner cavity of the submerged nozzle; 4. And (4) an outlet of the submerged nozzle.
Detailed Description
In order to more clearly understand the technical features, objects, and effects of the present invention, embodiments of the present invention will now be described with reference to the accompanying drawings.
Implementation mode one
As shown in fig. 1, the present invention provides a method for determining an abnormal clogging state of a submerged nozzle of a crystallizer, which comprises the following steps:
step S1: measuring temperature values of a plurality of temperature measuring points on a wide-surface copper plate of the continuous casting crystallizer 1;
specifically, as shown in fig. 2 and 6, step S1 includes:
step S101: a plurality of temperature measuring holes which are axially vertical to the wide-surface copper plate are uniformly arranged on the wide-surface copper plate of the continuous casting crystallizer 1 at intervals;
step S102: temperature measuring optical fibers 2 are respectively arranged in the temperature measuring holes and are perpendicular to the wide-surface copper plate, so that the temperature measuring optical fibers 2 are completely embedded in the continuous casting crystallizer 1;
step S103: the temperature measuring optical fiber 2 is a multi-grating temperature measuring optical fiber, so that each temperature measuring optical fiber 2 is provided with a plurality of gratings to form a plurality of temperature measuring points;
step S104: the temperature of the corresponding temperature measuring point is respectively collected through each temperature measuring optical fiber 2.
Specifically, the four side surfaces of the continuous casting crystallizer 1 are respectively provided with copper plates (wherein, two wide-surface copper plates are oppositely arranged, two narrow-surface copper plates are oppositely arranged, and the width of the wide-surface copper plates is larger than that of the narrow-surface copper plates), each temperature measuring optical fiber 2 is arranged on one wide-surface copper plate, a plurality of temperature measuring holes are uniformly arranged at intervals along the direction vertical to the wide-surface copper plates of the continuous casting crystallizer 1, a string of temperature measuring optical fibers 2 are respectively arranged in each temperature measuring hole, and the temperature measuring optical fibers 2 are fixed in the temperature measuring holes through sealing glue.
Further, the distance between two adjacent temperature measuring points is greater than or equal to 5mm, and the temperature measuring points are sparsely distributed at the bottom of the copper plate.
In a specific embodiment of the present invention, the number of the temperature measuring holes is 12, the number of the temperature measuring optical fibers 2 is 12, and each temperature measuring optical fiber 2 is provided with 30 gratings (i.e., each temperature measuring optical fiber has 30 temperature measuring points), so that 12 × 30 temperature measuring points are formed on the wide-surface copper plate of the continuous casting mold 1. Compared with the thermocouple temperature measurement in the prior art, the temperature measurement distance is reduced to the minimum 5mm from more than 100mm of the thermocouple temperature measurement, the temperature measurement density is greatly improved, and due to the fact that the density of the temperature measurement point is greatly increased, a high-resolution temperature field can be formed through temperature measurement, and the liquid level position can be obtained.
Step S2: according to the temperature values at the temperature measuring points, obtaining an isotherm diagram in the continuous casting crystallizer 1;
further, as shown in fig. 3, step S2 includes:
step S201: forming a temperature field in the continuous casting crystallizer 1 according to the temperature value of each temperature measuring point;
step S202: according to the temperature field, the isotherm diagram of the temperature field can be obtained by carrying out image processing on the temperature field.
Step S3: determining the liquid level position of the molten steel in the continuous casting crystallizer 1 according to the isotherm diagram, and monitoring the fluctuation condition of the liquid level;
as shown in fig. 7, since there is an obvious temperature change between the liquid slag and the molten steel, a temperature contour map of the liquid slag and the molten steel can be formed by the thermal imaging device, so that the position of the liquid level of the molten steel (the position of the temperature change between the liquid slag and the molten steel, i.e., the position of the liquid level) can be known; if the submerged nozzle outlet 4 of the continuous casting crystallizer 1 or the submerged nozzle inner cavity 3 of the continuous casting crystallizer 1 is nodulated or blocked, the molten steel liquid level can be changed in different shapes at different positions due to different nodulation positions and blocking degrees, so that the fluctuation condition of the liquid level (namely, the isotherm between liquid slag and molten steel in the isotherm diagram) needs to be monitored in real time.
Step S4: according to the fluctuation of the liquid level, the position of the accretion of the continuous casting mold 1 and the degree of clogging are determined.
In an alternative embodiment of the present invention, as shown in fig. 8, 15 and 16, step S4 includes:
if the position of the peak point of the liquid level fluctuation deviates to the center position of the submerged nozzle inner cavity 3 of the continuous casting crystallizer 1 and the amplitude of the liquid level fluctuation is reduced, the submerged nozzle inner cavity 3 of the continuous casting crystallizer 1 has a nodule phenomenon. The reason is as follows: the occurrence of the nodulation in the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1 can cause the turbulence of the flow speed of molten steel in the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1, so that the mass transfer impact point of the molten steel is reduced, and therefore, the positions of peak points of liquid level fluctuation close to the water ports on the two sides of the continuous casting crystallizer 1 are all deviated to the central position of the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1 (wherein the connecting line of each block coordinate point is the liquid level position of each temperature measuring point in a normal production state, and the connecting line of each star coordinate point is the liquid level position of each temperature measuring point in the nodulation state of the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1).
In an alternative embodiment of the present invention, as shown in fig. 9 and 17, step S4 includes:
if the position of the peak point of the liquid level fluctuation is not changed and the amplitude of the liquid level fluctuation is increased, serious nodulation occurs at the submerged nozzle outlet 4 of the continuous casting crystallizer 1. The reason is as follows: the serious nodulation at the outlet 4 of the submerged nozzle of the continuous casting crystallizer 1 can cause the section of the nozzle to be reduced, the mass transfer speed of molten steel is accelerated, the depth of an impact point is increased, the fluctuation range of the liquid surface is intensified, the position of the peak value of the fluctuation of the liquid surface is not changed, and the range of the peak value of the fluctuation of the liquid surface is increased (wherein the connecting line of each block coordinate point is the liquid surface position of each temperature measuring point in a normal production state, and the connecting line of each star coordinate point is the liquid surface position of each temperature measuring point in the nodulation state of the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1).
In an alternative embodiment of the present invention, as shown in fig. 10 and 18, step S4 includes:
if the liquid level fluctuates asymmetrically, the unilateral nodulation phenomenon occurs in the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1 or the outlet 4 of the submerged nozzle of the continuous casting crystallizer 1. The reason is as follows: when one-side nodulation occurs in an inner cavity 3 of an immersion nozzle of the continuous casting crystallizer 1 or an outlet 4 of the immersion nozzle of the continuous casting crystallizer 1, the molten steel can be deflected in the inner cavity of the nozzle, so that the flow rate of the one-side nozzle is accelerated, the liquid level has the phenomenon that the forms of two sides are obviously asymmetric, and particularly, the positions and the shapes of peak points of fluctuation of two sides of the liquid level have obvious difference (wherein the connecting line of each block coordinate point is the liquid level position of each temperature measuring point in a normal production state, and the connecting line of each star coordinate point is the liquid level position of each temperature measuring point in the nodulation state of the inner cavity 3 of the immersion nozzle of the continuous casting crystallizer 1).
In an optional embodiment of the present invention, when the position information of the temperature measurement points is sparse, the effective characteristic value of the liquid level cannot be extracted, and then a connection curve of the temperature values at the temperature measurement points in the normal state and a connection curve of the temperature values at the temperature measurement points in the nodulation state need to be respectively obtained through a model algorithm, so as to achieve the purpose of processing data.
Further, if a single-side nodule occurs in the submerged nozzle inner cavity 3 of the continuous casting mold 1 or the submerged nozzle outlet 4 of the continuous casting mold 1 (as shown in fig. 10), the high-order fitting may be performed on the temperature values at the respective temperature measurement points in the normal state and the temperature values at the respective temperature measurement points in the nodule occurrence state, so as to obtain fitting curves of the temperature values at the respective temperature measurement points in the normal state and the temperature values at the respective temperature measurement points in the nodule occurrence state. As shown in fig. 11, the dotted line part is a curve obtained by fitting the data of the temperature values at the respective temperature measurement points 10 times in a normal state; the solid line part is a curve obtained by fitting the temperature values on the temperature measuring points for 10 times under the state of generating the nodulation.
Further, if a single-side nodule occurs in the submerged nozzle inner cavity 3 of the continuous casting mold 1 or the submerged nozzle outlet 4 of the continuous casting mold 1 (as shown in fig. 10), the three-time B-spline interpolation processing may be performed on the temperature values at the temperature measurement points in the normal state and the temperature values at the temperature measurement points in the nodule occurrence state, so as to obtain interpolation curves of the temperature values at the temperature measurement points in the normal state and the temperature values at the temperature measurement points in the nodule occurrence state, respectively. As shown in fig. 12, the change of the curve state can be analyzed more accurately by cubic B-spline interpolation processing.
In an alternative embodiment of the present invention, a model algorithm (such as the above-mentioned high-order fitting method or cubic B-spline interpolation method) is used to extract characteristic values of the liquid level through a curve, wherein the characteristic values include characteristic data such as the fluctuation speed of the liquid level, the amplitude of the position of the peak point of the fluctuation of the liquid level, the difference between the relative positions of the peak points on the left and right sides of the liquid level, and the speed change of the peak points on the left and right sides of the liquid level.
Specifically, as can be seen from fig. 13, in the current casting process, the overall fluctuation range of the liquid level is gradually increased in a time period of about 1700s, and under the condition that the overall production process parameters are not adjusted and changed, the occurrence of the situation may be caused by the occurrence of accretion at the submerged nozzle of the continuous casting crystallizer 1, and according to the fluctuation condition, the worker can check the submerged nozzle of the continuous casting crystallizer 1; as can be seen from fig. 14, during the same casting process, the amplitude of the peak point position of the fluctuation on the left side of the liquid level is obviously increased (the amplitude of the peak point position of the fluctuation on the left side of the liquid level is unchanged) in the period of about 1700s, which may be caused by the blockage of the submerged nozzle on one side of the continuous casting mold 1, and the submerged nozzle on the left side of the continuous casting mold 1 can be checked by the operator according to the fluctuation.
The method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer has the characteristics and advantages that;
a method for judging the abnormal state of nodulation and blockage of a submerged nozzle of a crystallizer can obtain a high-precision temperature field in a continuous casting crystallizer 1 by arranging a plurality of temperature measuring points on the continuous casting crystallizer 1 and respectively measuring the temperature value at each temperature measuring point through a temperature measuring optical fiber 2, and because the temperature difference between liquid slag and molten steel in the continuous casting crystallizer 1 causes the intersection position of the liquid slag and the molten steel to have obvious temperature change, an isotherm diagram in the continuous casting crystallizer 1 can be obtained according to the temperature value at each temperature measuring point, the liquid level position of the molten steel in the continuous casting crystallizer 1 can be determined according to the isotherm diagram, so that the shape and the fluctuation condition of the liquid level are monitored in real time, various parameters of the liquid level state are further obtained, and the purpose of judging the nodulation position and the blockage degree of the continuous casting crystallizer 1 is achieved.
The judging method for the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer can provide visual real-time images for field production, predict nodulation or blockage, give an alarm when the nodulation and the blockage have great influence on normal production, remind field operators to replace the nozzle in time, effectively avoid casting stop or quality defects, improve casting quality and ensure efficient and stable production.
Second embodiment
As shown in fig. 4, the present invention provides a device for determining an abnormal state of a mold, which comprises a temperature measuring unit 10, an isotherm determining unit 20, a liquid level determining unit 30 and a determining unit 40, wherein the temperature measuring unit 10 is used for measuring temperature values of a plurality of temperature measuring points on a wide-surface copper plate of a continuous casting mold 1; the isotherm determining unit 20 is configured to obtain an isotherm diagram in the continuous casting crystallizer 1 according to the temperature values at the respective temperature measuring points; the liquid level determining unit 30 is used for determining the liquid level position of the molten steel in the continuous casting crystallizer 1 according to the isothermal map and monitoring the fluctuation condition of the liquid level; the judging unit 40 is used for determining the position of the accretion and the clogging degree of the continuous casting mold 1 according to the fluctuation of the liquid level.
Specifically, the temperature measuring unit 10 is provided with a plurality of temperature measuring holes uniformly and at intervals along a direction perpendicular to a wide-face copper plate of the continuous casting crystallizer 1, a string of temperature measuring optical fibers 2 is buried in each temperature measuring hole, the number of the temperature measuring holes is 12, the number of the temperature measuring optical fibers 2 is 12, the temperature measuring optical fibers 2 are arranged in each temperature measuring hole, each string of temperature measuring optical fibers 2 is provided with 30 gratings (i.e., temperature measuring points), and the temperature of the temperature measuring points at corresponding positions is collected through each temperature measuring optical fiber 2.
Furthermore, the distance between two adjacent gratings is larger than or equal to 5mm, compared with the thermocouple temperature measurement in the prior art, the temperature measurement distance is reduced to the minimum 5mm from the temperature measurement distance larger than 100mm of the thermocouple temperature measurement, the temperature measurement density is greatly improved, and due to the fact that the density of the temperature measurement point is greatly increased, a high-resolution temperature field can be formed through temperature measurement, and the liquid level position can be obtained.
Further, the temperature measuring optical fiber 2 is a multi-grating temperature measuring optical fiber.
In an alternative embodiment of the present invention, as shown in fig. 5, the isotherm determining unit 20 includes a temperature field forming module 21 and an isotherm determining module 22, the temperature field forming module 21 is configured to form a temperature field in the continuous casting mold 1 according to the temperature value of each temperature measuring point; the isotherm determination module 22 is configured to obtain an isotherm map of the temperature field based on the temperature field.
The device for judging the abnormal state of the crystallizer has the characteristics and advantages that;
the crystallizer abnormal state judging device collects and monitors the temperature of the whole continuous casting crystallizer 1 based on the temperature measuring optical fiber 2 arranged on the continuous casting crystallizer 1, and can obtain a more accurate temperature field than the traditional thermocouple temperature measuring device, thereby obtaining a high-precision temperature field in the continuous casting crystallizer 1; whether the continuous casting crystallizer 1 is nodulated, the nodulated position and the blockage degree can be inferred through parameters such as a liquid level speed extreme point, a fluctuation condition, a high point position and the like, visual real-time images can be provided for the site for auxiliary production, and an alarm is given when the nodulated and the blocked have great influence on the production to remind the site operator to replace the water gap in time so as to avoid casting stop or quality defects.
Third embodiment
The invention provides a computer device, which comprises a memory, a processor and a computer program stored on the memory and capable of running on the processor, wherein the processor realizes the judgment method of the abnormal state of the crystallizer when executing the computer program.
In particular, the computer device may be a computer terminal, a server or a similar computing device.
Embodiment IV
The present invention provides a computer-readable storage medium storing a computer program for executing the above-described method for determining an abnormal state of a mold.
In particular, computer-readable storage media, including both non-transitory and non-transitory, removable and non-removable media, may implement information storage by any method or technology. The information may be computer readable instructions, data structures, modules of a program, or other data. Examples of computer-readable storage media include, but are not limited to, phase change memory (PRAM), Static Random Access Memory (SRAM), Dynamic Random Access Memory (DRAM), other types of Random Access Memory (RAM), Read Only Memory (ROM), Electrically Erasable Programmable Read Only Memory (EEPROM), flash memory or other memory technology, compact disc read only memory (CD-ROM), Digital Versatile Discs (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium that can be used to store information that can be accessed by a computing device. As defined herein, a computer readable storage medium does not include a transitory computer readable medium such as a modulated data signal and a carrier wave.
As will be appreciated by one skilled in the art, embodiments of the present application may be provided as a method, system, or computer program product. Accordingly, the present application may take the form of an entirely hardware embodiment, an entirely software embodiment or an embodiment combining software and hardware aspects. Furthermore, the present application may take the form of a computer program product embodied on one or more computer-usable storage media (including, but not limited to, disk storage, CD-ROM, optical storage, and the like) having computer-usable program code embodied therein.
The present application is described with reference to flowchart illustrations and/or block diagrams of methods, apparatus (systems), and computer program products according to embodiments of the application. It will be understood that each flow and/or block of the flow diagrams and/or block diagrams, and combinations of flows and/or blocks in the flow diagrams and/or block diagrams, can be implemented by computer program instructions. These computer program instructions may be provided to a processor of a general purpose computer, special purpose computer, embedded processor, or other programmable data processing apparatus to produce a machine, such that the instructions, which execute via the processor of the computer or other programmable data processing apparatus, create means for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be stored in a computer-readable memory that can direct a computer or other programmable data processing apparatus to function in a particular manner, such that the instructions stored in the computer-readable memory produce an article of manufacture including instruction means which implement the function specified in the flowchart flow or flows and/or block diagram block or blocks.
These computer program instructions may also be loaded onto a computer or other programmable data processing apparatus to cause a series of operational steps to be performed on the computer or other programmable apparatus to produce a computer implemented process such that the instructions which execute on the computer or other programmable apparatus provide steps for implementing the functions specified in the flowchart flow or flows and/or block diagram block or blocks.
The above description is only an exemplary embodiment of the present invention, and is not intended to limit the scope of the present invention. Any equivalent changes and modifications that can be made by one skilled in the art without departing from the spirit and principles of the invention should fall within the protection scope of the invention.
Claims (11)
1. A method for judging the nodulation and blockage abnormal state of a submerged nozzle of a crystallizer is characterized by comprising the following steps:
measuring temperature values of a plurality of temperature measuring points on the crystallizer;
according to the temperature values at the temperature measuring points, obtaining an isotherm diagram in the crystallizer;
determining the liquid level position of the molten steel in the crystallizer according to the isothermal map, and monitoring the fluctuation condition of the liquid level;
and determining the nodulation position and the blockage degree of the crystallizer according to the fluctuation condition of the liquid level.
2. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the measuring the temperatures of a plurality of temperature measuring points on the crystallizer comprises:
a plurality of temperature measuring holes are uniformly arranged on a wide-surface copper plate of the continuous casting crystallizer at intervals;
temperature measuring optical fibers are respectively arranged in the temperature measuring holes, so that the temperature measuring optical fibers are completely embedded in the continuous casting crystallizer;
a plurality of gratings are formed on each temperature measuring optical fiber to form the temperature measuring point;
and the temperature measuring optical fibers respectively collect the temperature of each temperature measuring point.
3. The method for determining the clogging abnormal condition of the submerged nozzle of the crystallizer of claim 1, wherein the distance between two adjacent temperature measuring points is greater than or equal to 5 mm.
4. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the obtaining the isotherm diagram in the crystallizer according to the temperature value at each temperature measuring point comprises:
forming a temperature field in the crystallizer according to the temperature value of each temperature measuring point;
and obtaining an isotherm diagram of the temperature field according to the temperature field.
5. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the determining the position of the clogging and the clogging degree of the crystallizer according to the fluctuation of the liquid level comprises:
if the position of the peak point of the liquid level fluctuation deviates to the central position of the inner cavity of the submerged nozzle of the crystallizer and the amplitude of the liquid level fluctuation is reduced, the inner cavity of the submerged nozzle of the crystallizer has a nodulation phenomenon.
6. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the determining the position of the clogging and the clogging degree of the crystallizer according to the fluctuation of the liquid level comprises:
if the position of the peak point of the liquid level fluctuation is unchanged and the amplitude of the liquid level fluctuation is increased, serious nodulation occurs at the outlet of the submerged nozzle of the crystallizer.
7. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the determining the position of the clogging and the clogging degree of the crystallizer according to the fluctuation of the liquid level comprises:
if the liquid level is in asymmetric fluctuation, unilateral nodulation occurs in an inner cavity of an immersion nozzle of the crystallizer or an outlet of the immersion nozzle of the crystallizer.
8. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 1, wherein the obtaining the isotherm diagram in the crystallizer according to the temperature value at each temperature measuring point comprises:
and respectively obtaining a connection curve of the temperature values on the temperature measuring points in a normal state and a connection curve of the temperature values on the temperature measuring points in a nodulation state through a model algorithm.
9. The method for determining the clogging abnormal condition of the submerged nozzle of the crystallizer according to claim 8, wherein the high-order fitting is performed on the temperature value at each temperature measuring point in the normal condition and the temperature value at each temperature measuring point in the clogging condition, respectively, to obtain a fitting curve of the temperature value at each temperature measuring point in the normal condition and the temperature value at each temperature measuring point in the clogging condition, respectively.
10. The method for determining the clogging abnormal condition of the submerged nozzle of the crystallizer according to claim 8, wherein the cubic B-spline interpolation is performed on the temperature value at each temperature measuring point in the normal condition and the temperature value at each temperature measuring point in the clogging condition, respectively, to obtain the interpolation curves of the temperature value at each temperature measuring point in the normal condition and the temperature value at each temperature measuring point in the clogging condition, respectively.
11. The method for determining the clogging abnormal state of the submerged nozzle of the crystallizer according to claim 8, wherein the characteristic value of the liquid level is extracted through the curve;
the characteristic value includes a fluctuation speed of the liquid level and an amplitude of a peak point position of the liquid level fluctuation.
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