CN114012053B - Method for judging abnormal state of crystallizer immersed nozzle nodulation and blockage - Google Patents
Method for judging abnormal state of crystallizer immersed nozzle nodulation and blockage Download PDFInfo
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- CN114012053B CN114012053B CN202111255045.XA CN202111255045A CN114012053B CN 114012053 B CN114012053 B CN 114012053B CN 202111255045 A CN202111255045 A CN 202111255045A CN 114012053 B CN114012053 B CN 114012053B
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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
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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
- G06—COMPUTING; CALCULATING OR COUNTING
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Abstract
The invention relates to a method for judging the abnormal state of the nodulation and the blockage of a immersed 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 of the temperature measuring points, an isothermal diagram in the crystallizer is obtained; determining the liquid level position of molten steel in the crystallizer according to the isothermal line graph, 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 the blocking condition of the immersed nozzle of the crystallizer can not 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 abnormal states of nodulation and blockage of a submerged nozzle of a crystallizer.
Background
The crystallizer is the most important part in steelmaking continuous casting production, molten steel is cooled to form a billet shell, a continuous casting machine is supported for drawing billets, impurities in the molten steel are effectively removed through procedures such as electromagnetic stirring, and a casting billet with good quality is formed.
The existing steelmaking continuous casting molten steel is injected into a crystallizer through a submerged nozzle, and the flow 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 also directly influence the fluctuation of the liquid level of the molten steel in the crystallizer (under the normal state, the amplitude and the flow rate of the fluctuation of the liquid level of the molten steel in the crystallizer are stable). However, during casting, molten steel will be generated with the nozzle wall when passing through the immersed nozzle of the crystallizerReact and generate Al 2 O 3 The particulate matter (alumina) is concentrated and adsorbed at the outlet position of the submerged nozzle or forms nodules in the inner cavity of the submerged nozzle by molten steel flow.
Once the nodulation occurs, the nodulation position absorbs sinter impurities, steel impurities and the like, which can accelerate the nodulation process, and the serious condition can cause the blockage of a water gap. In addition, the formation of nodulation can cause the molten steel to generate bias flow in the inner cavity of the submerged nozzle, so as to form self-acceleration effect, further accelerate the accumulation of cold steel inclusion layers, and even if the nozzle is not blocked, the vortex phenomenon of molten steel flow can be caused, thereby directly affecting the quality of casting blanks and causing the quality defects of casting blanks such as slag inclusion bubbles and the like; if the nodulation is serious, not only the casting blank quality defect can be caused, but also the casting and production stopping can be caused if the water gap is blocked, so that huge economic loss is caused.
At present, whether the crystallizer is in an abnormal state can be judged by only measuring the liquid level position in the crystallizer, the liquid level position and the temperature of the crystallizer are mainly measured by a sensor (such as a thermocouple sensor), and the temperature is limited by the structure of the sensor, so that the defects of small measuring area, low measuring 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 the blockage of the immersed nozzle of the crystallizer at present, the method is mainly off-line detection, can not be used for guiding production on line, can not judge the position of the nodulation or the blockage, and has poor use effect. Therefore, no better method for detecting and judging the nodulation and the blockage of the immersed nozzle of the crystallizer on line exists at present.
Aiming at the problems that the nodulation and the blocking condition of the immersed nozzle of the crystallizer cannot be detected on line and the detection accuracy is low in the related art, no effective solution is provided at present.
Therefore, the inventor provides a judging method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer by virtue of experience and practice of related industries for many years so as to overcome the defects of the prior art.
Disclosure of Invention
The invention aims to provide a judging method of a crystallizer immersed nozzle nodulation blocking abnormal state, which is characterized in that a temperature field which is more accurate than the traditional thermocouple temperature measurement can be obtained by measuring the temperature through a plurality of optical fiber temperature sensors arranged on a continuous casting crystallizer, so that the specific shape and the flowing condition of the molten steel liquid level in the crystallizer can be obtained, and by applying a model algorithm, whether the immersed nozzle of the crystallizer and the inside thereof form blocking due to nodulation can be accurately judged, and site personnel can be timely reminded of replacing the nozzle, thereby avoiding the occurrence of casting stop or quality defects.
The aim of the invention can be achieved by adopting the following technical scheme:
the invention provides a method for judging the abnormal state of the nodulation and the blockage of a immersed 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 of the temperature measuring points, an isothermal line graph in the crystallizer is obtained;
determining the liquid level position of molten steel in the crystallizer according to the isothermal line graph, and monitoring the fluctuation condition of the liquid level;
and determining the nodulation position and the blocking degree of the crystallizer according to the fluctuation condition of the liquid level.
In a preferred embodiment of the present invention, the measuring the temperature of a plurality of temperature measuring points on the mold includes:
uniformly and alternately arranging a plurality of temperature measuring holes on a wide-surface copper plate of the continuous casting crystallizer;
a temperature measuring optical fiber is respectively arranged in each temperature measuring hole, so that the temperature measuring optical fiber is completely buried in the continuous casting crystallizer;
a plurality of gratings are formed on each temperature measuring optical fiber to form the temperature measuring points;
and each temperature measuring optical fiber respectively collects the temperature of each temperature measuring point.
In a preferred embodiment of the present invention, a distance between two adjacent temperature measurement points is greater than or equal to 5mm.
In a preferred embodiment of the present invention, the obtaining the isothermal line graph in the crystallizer according to the temperature value at each temperature measuring point includes:
forming a temperature field in the crystallizer through the temperature value of each temperature measuring point;
and obtaining an isothermal line graph of the temperature field according to the temperature field.
In a preferred embodiment of the present invention, the determining the position of the nodulation and the clogging degree of the crystallizer 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 immersed nozzle of the crystallizer and the amplitude of the liquid level fluctuation is reduced, the inner cavity of the immersed nozzle of the crystallizer is subject to a nodulation phenomenon.
In a preferred embodiment of the present invention, the determining the position of the nodulation and the clogging degree of the crystallizer 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 immersed nozzle of the crystallizer.
In a preferred embodiment of the present invention, the determining the position of the nodulation and the clogging degree of the crystallizer according to the fluctuation of the liquid level includes:
if the liquid level is in asymmetric fluctuation, a single-side nodulation phenomenon occurs in the inner cavity of the immersed nozzle of the crystallizer or at the outlet of the immersed nozzle of the crystallizer.
In a preferred embodiment of the present invention, the obtaining the isothermal line graph in the crystallizer according to the temperature value at each temperature measuring point includes:
and respectively obtaining a connecting curve of the temperature value on each temperature measuring point in a normal state and a connecting curve of the temperature value on each temperature measuring point in a nodulation state through a model algorithm.
In a preferred embodiment of the present invention, the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state are fitted in a high order to obtain fitting curves of the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state, respectively.
In a preferred embodiment of the present invention, the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state are respectively subjected to the cubic B-spline interpolation processing, so as to obtain interpolation curves of the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state.
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 surface and an amplitude of a peak point position of the liquid surface fluctuation.
From the above, the method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer has the characteristics and advantages that: the temperature measuring points are arranged on the continuous casting crystallizer, the temperature values of the temperature measuring points are measured through the temperature measuring optical fibers respectively, a more accurate temperature field can be formed compared with the conventional couple temperature measurement, so that a high-precision temperature field in the crystallizer is obtained, and the temperature difference between liquid slag and molten steel in the crystallizer causes obvious temperature change at the intersection position of the liquid slag and the molten steel, so that an isothermal line 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 isothermal line diagram, the shape and fluctuation condition of the liquid level are monitored in real time, and various parameters of the liquid level state are further obtained, so that the purpose of judging the nodulation position and the blocking degree of the crystallizer is achieved. The invention can provide visual real-time images for on-site production, predicts the nodulation or the blockage, alarms when the nodulation and the blockage have great influence on the production, reminds on-site operators to replace the water gap in time, effectively avoids the defect of casting stop or quality, improves casting quality and ensures that the production is carried out efficiently and stably.
Drawings
The following drawings are only for purposes of illustration and explanation of the present invention and are not intended to limit the scope of the invention.
Wherein:
fig. 1: the method is one of flowcharts of a method for judging abnormal states of the crystallizer immersed nozzle nodulation and blockage.
Fig. 2: the second flow chart is a method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 3: the third flow chart is a method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 4: the method is one of device structure block diagrams of the method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 5: the second device structure block diagram is the judging method of the crystallizer immersed nozzle nodulation blocking abnormal state.
Fig. 6: the invention relates to a setting position diagram of each temperature measuring optical fiber in the judging method of the abnormal state of the crystallizer immersed nozzle nodulation and blockage.
Fig. 7: the isothermal line graph of the temperature field in the method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer is provided.
Fig. 8: the method is one of liquid level fluctuation schematic diagrams in the judging method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 9: the second liquid level fluctuation diagram is the judgment method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 10: the third liquid level fluctuation diagram is in the judging method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 11: the method is a schematic diagram for carrying out high-order fitting on data in the judging method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 12: the method is a schematic diagram for performing cubic B spline interpolation processing on data in the judging method of the abnormal state of the crystallizer immersed nozzle nodulation and blockage.
Fig. 13: the method is a schematic diagram of the overall fluctuation speed of the liquid level in the method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 14: the method is a schematic diagram of the amplitude of the peak point position at the left side of the liquid level in the method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer.
Fig. 15: the method is a schematic diagram of the phenomenon of slight nodulation of the inner cavity of the immersed nozzle of the crystallizer in the method for judging the nodulation and blockage abnormal state of the immersed nozzle of the crystallizer.
Fig. 16: the method is a schematic diagram of the phenomenon of serious nodulation occurring in the inner cavity of the immersed nozzle of the crystallizer in the method for judging the nodulation and blockage abnormal state of the immersed nozzle of the crystallizer.
Fig. 17: the method is a schematic diagram of the phenomenon of serious nodulation at the submerged nozzle of the crystallizer in the method for judging the nodulation and blockage abnormal state of the submerged nozzle of the crystallizer.
Fig. 18: the method is a schematic diagram of the phenomenon of single-side nodulation of the crystallizer in the method for judging the abnormal nodulation and blockage states of the immersed nozzle of the crystallizer.
The reference numerals in the invention are:
10. a temperature measuring unit; 20. An isotherm determining unit;
21. a temperature field forming module; 22. An isotherm determining module;
30. a liquid level determining unit; 40. A judging unit;
1. a continuous casting crystallizer; 2. A temperature measuring optical fiber;
3. an inner cavity of the immersion nozzle; 4. Submerged entry nozzle outlet.
Detailed Description
For a clearer understanding of technical features, objects, and effects of the present invention, a specific embodiment of the present invention will be described with reference to the accompanying drawings.
Embodiment one
As shown in fig. 1, the invention provides a method for judging the abnormal state of the nodulation and the blockage of a immersed nozzle of a crystallizer, which comprises the following steps:
step S1: measuring temperature values of a plurality of temperature measuring points on a wide 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 perpendicular to the wide copper plate are uniformly and alternately arranged on the wide copper plate of the continuous casting crystallizer 1;
step S102: the temperature measuring holes are respectively provided with temperature measuring optical fibers 2 perpendicular to the wide copper plates, so that the temperature measuring optical fibers 2 are completely buried in the continuous casting crystallizer 1;
step S103: the temperature measuring optical fibers 2 are multi-grating temperature measuring optical fibers, so that a plurality of gratings are respectively arranged on each temperature measuring optical fiber 2 to form a plurality of temperature measuring points;
step S104: the temperature of the corresponding temperature measuring point is respectively acquired through each temperature measuring optical fiber 2.
Specifically, copper plates are arranged on four side surfaces of a continuous casting crystallizer 1 (wherein two wide copper plates are arranged oppositely, two narrow copper plates are arranged oppositely, and the width of each wide copper plate is larger than that of each narrow copper plate), and according to the invention, each temperature measuring optical fiber 2 is arranged on one wide copper plate, a plurality of temperature measuring holes are uniformly and alternately arranged along the direction perpendicular to the wide copper plate 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 larger than or equal to 5mm, and the distribution of the temperature measuring points at the bottom of the copper plate is sparse when the temperature measuring points are closer to the copper plate.
In one embodiment of the present invention, the number of the temperature measuring holes is 12, and the number of the temperature measuring optical fibers 2 is 12 strings, and 30 gratings are respectively arranged on each string of the temperature measuring optical fibers 2 (i.e. 30 temperature measuring points are arranged on each string of the temperature measuring optical fibers), so that 12×30 temperature measuring points are formed on the wide copper plate of the continuous casting crystallizer 1 in a conformal manner. Compared with the thermocouple temperature measurement adopted in the prior art, the temperature measurement distance is reduced to the minimum 5mm from the temperature measurement of more than 100mm of the thermocouple, the temperature measurement density is greatly improved, and the temperature measurement density is greatly increased, so that 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 of the temperature measuring points, an isothermal line graph in the continuous casting crystallizer 1 is obtained;
further, as shown in fig. 3, step S2 includes:
step S201: forming a temperature field in the continuous casting crystallizer 1 through the temperature value of each temperature measuring point;
step S202: according to the temperature field, an isothermal line graph of the temperature field can be obtained by performing image processing on the temperature field.
Step S3: determining the liquid level position of molten steel in the continuous casting crystallizer 1 according to the isothermal line graph, and monitoring the fluctuation condition of the liquid level;
as shown in fig. 7, since there is a significant temperature change between the liquid slag and the molten steel, an isothermal line graph 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 mold 1 or the submerged nozzle inner cavity 3 of the continuous casting mold 1 is subject to nodulation or blockage, the liquid level of the molten steel is subject to different shape changes at different positions due to different nodulation positions and blockage degrees, so that the fluctuation condition of the liquid level (i.e. an isothermal line between liquid slag and molten steel in an isothermal line diagram) needs to be monitored in real time.
Step S4: the position of the nodulation and the degree of clogging of the continuous casting mold 1 are determined according to the fluctuation of the liquid level.
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 from the center position of the submerged entry nozzle inner chamber 3 of the continuous casting mold 1 and the amplitude of the liquid level fluctuation decreases, the submerged entry nozzle inner chamber 3 of the continuous casting mold 1 suffers from a nodulation phenomenon. The reason for this is: 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 velocity 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 molten steel is reduced, and therefore, the positions of peak points of the fluctuation of the liquid level near the water openings at two sides of the continuous casting crystallizer 1 are all deviated to the center position of the inner cavity 3 of the submerged nozzle of the continuous casting crystallizer 1 (wherein, the connecting line of each square coordinate point is the liquid level position of each temperature measuring point in the 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 unchanged and the amplitude of the liquid level fluctuation is increased, serious nodulation occurs at the submerged nozzle outlet 4 of the continuous casting mold 1. The reason for this is: serious nodulation occurs at the immersed nozzle outlet 4 of the continuous casting crystallizer 1, which causes the reduction of nozzle cross section, the acceleration of molten steel mass transfer speed, the increase of depth of impact points, the increase of liquid level fluctuation amplitude, the unchanged position of peak points of liquid level fluctuation, and the increase of amplitude of the peak points of liquid level fluctuation (wherein, the connection line of each square coordinate point is the liquid level position of each temperature measuring point in the normal production state, and the connection line of each star coordinate point is the liquid level position of each temperature measuring point in the nodulation state of the immersed nozzle inner cavity 3 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 surface is in asymmetric fluctuation, a single-side nodulation phenomenon occurs at the submerged nozzle inner cavity 3 of the continuous casting crystallizer 1 or the submerged nozzle outlet 4 of the continuous casting crystallizer 1. The reason for this is: when a single-side nodulation occurs in the submerged nozzle inner cavity 3 of the continuous casting crystallizer 1 or the submerged nozzle outlet 4 of the continuous casting crystallizer 1, the molten steel is biased in the nozzle cavity, so that the flow speed of the single-side nozzle is accelerated, the phenomenon that the shapes of the two sides of the liquid surface are obviously asymmetric is caused, particularly, the positions and the shapes of peak points of fluctuation on the two sides of the liquid surface have obvious differences (wherein the connecting line of each square coordinate point is the liquid level position of each temperature measuring point in the 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 submerged nozzle inner cavity 3 of the continuous casting crystallizer 1).
In an alternative embodiment of the invention, when the position information of the temperature measuring points is sparse, the effective characteristic value of the liquid level cannot be extracted, and then the connection curve of the temperature value on each temperature measuring point in a normal state and the connection curve of the temperature value on each temperature measuring point in a nodulation state are required to be respectively obtained through a model algorithm, so that the purpose of processing the data is achieved.
Further, if a single-side nodulation phenomenon 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 temperature values at the respective temperature measuring points in the normal state and the temperature values at the respective temperature measuring points in the nodulation state may be fitted in a high order to obtain fitting curves of the temperature values at the respective temperature measuring points in the normal state and the temperature values at the respective temperature measuring points in the nodulation state, respectively. As shown in fig. 11, the dotted line part is a curve obtained by fitting 10 times to the data of the temperature values at each temperature measurement point in a normal state; the solid line part is a curve obtained by performing 10 fits on the temperature values at each temperature measuring point in the state of occurrence of the nodulation.
Further, if a single-side nodulation phenomenon 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 temperature values at the respective temperature measuring points in the normal state and the temperature values at the respective temperature measuring points in the nodulation state may be respectively subjected to a cubic B-spline interpolation process to obtain interpolation curves of the temperature values at the respective temperature measuring points in the normal state and the temperature values at the respective temperature measuring points in the nodulation state. As shown in fig. 12, the change in the curve state can be more accurately analyzed by the cubic B-spline interpolation process.
In an alternative embodiment of the present invention, a model algorithm (such as the above-mentioned higher order fitting method or the cubic B-spline interpolation method) is used to extract the characteristic value of the liquid level through the curve, where the characteristic value includes the fluctuation speed of the liquid level, the amplitude of the peak point position of the liquid level fluctuation, the difference value of the peak point relative positions on the left and right sides of the liquid level, and the characteristic value data such as the change of the peak point speeds on the left and right sides of the liquid level.
Specifically, as can be seen from fig. 13, in the casting process, in the period of about 1700s, the overall fluctuation range of the liquid level is gradually increased, and under the condition that the overall production process parameters are not changed, the occurrence of the situation may be caused by the occurrence of a nodulation at the submerged nozzle of the continuous casting crystallizer 1, and according to the fluctuation situation, a worker can check the submerged nozzle of the continuous casting crystallizer 1; as can be seen from fig. 14, however, during the same casting process, also in a period of about 1700s, a significant increase in the amplitude of the peak position of the fluctuation on the left side of the liquid surface occurs (there is no change in the amplitude of the peak position of the fluctuation on the left side of the liquid surface), which may occur due to clogging of the submerged entry nozzle on the single side of the continuous casting mold 1, from which the operator can check the submerged entry nozzle on the left side of the continuous casting mold 1.
The method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer has the characteristics and advantages that;
1. according to the judging method of the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer, a plurality of temperature measuring points are arranged on the continuous casting crystallizer 1, and the temperature values of the temperature measuring points are measured through the temperature measuring optical fibers 2, so that a high-precision temperature field in the continuous casting crystallizer 1 is obtained, and the temperature difference between liquid slag and molten steel in the continuous casting crystallizer 1 causes obvious temperature change at the intersection position of the liquid slag and the molten steel, so that an isothermal line diagram in the continuous casting crystallizer 1 can be obtained according to the temperature values of the temperature measuring points, the position of the molten steel in the continuous casting crystallizer 1 can be determined according to the isothermal line diagram, the shape and the fluctuation condition of the liquid level can be monitored in real time, and various parameters of the liquid level state can be further obtained, so that the purpose of judging the nodulation position and the blockage degree of the continuous casting crystallizer 1 is achieved.
2. The method for judging the abnormal state of the nodulation and the blockage of the immersed nozzle of the crystallizer can provide visual real-time images for on-site production, predicts the nodulation or the blockage, alarms when the nodulation and the blockage have great influence on normal production, reminds on-site operators of timely replacing the nozzle, effectively avoids the defects of stopping casting or quality, improves casting quality, and ensures that the production is carried out efficiently and stably.
Second embodiment
As shown in fig. 4, the present invention provides a device for determining 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 copper plate of a continuous casting mold 1; the isotherm determining unit 20 is used for obtaining an isotherm diagram in the continuous casting crystallizer 1 according to the temperature values of the temperature measuring points; the liquid level determining unit 30 is used for determining the liquid level position of molten steel in the continuous casting crystallizer 1 according to the isothermal line graph and monitoring the fluctuation condition of the liquid level; the judging unit 40 is used for determining the nodulation position and the blockage degree of the continuous casting mold 1 according to the fluctuation condition of the liquid level.
Specifically, the temperature measuring unit 10 is provided with a plurality of temperature measuring holes uniformly and at intervals along the direction perpendicular to the wide copper plate of the continuous casting crystallizer 1, a string of temperature measuring optical fibers 2 are respectively embedded 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 respectively arranged in each temperature measuring hole, 30 gratings (namely, temperature measuring points) are respectively arranged on each string of temperature measuring optical fibers 2, and the temperatures of the temperature measuring points at corresponding positions are respectively collected through each temperature measuring optical fiber 2.
Further, the distance between two adjacent gratings is greater than or equal to 5mm, compared with the thermocouple temperature measurement adopted in the prior art, the temperature measurement distance is reduced to the minimum 5mm from the temperature measurement of more than 100mm of the thermocouple temperature measurement, the temperature measurement density is greatly improved, and the temperature measurement density is greatly increased, so that 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 being for forming a temperature field in the continuous casting mold 1 by the temperature values of the respective temperature measuring points; the isotherm determining module 22 is configured to obtain an isotherm map of the temperature field from the temperature field.
The judging device for the abnormal state of the crystallizer has the characteristics and advantages that;
according to the judging device for the abnormal state of the crystallizer, the temperature of the whole continuous casting crystallizer 1 is collected and monitored based on the temperature measuring optical fiber 2 arranged on the continuous casting crystallizer 1, a temperature field which is more accurate than that of a traditional thermocouple temperature measuring device can be obtained, so that a high-precision temperature field in the continuous casting crystallizer 1 is obtained, and the specific shape and fluctuation condition of the liquid level can be observed by using an isotherm due to obvious temperature change between liquid slag and molten steel; through parameters such as a liquid level speed pole, fluctuation conditions, high-point positions and the like, whether the continuous casting crystallizer 1 is nodulated, the nodulation position and the blocking degree can be estimated, visual real-time images can be provided for on-site auxiliary production, and when the nodulation and the blocking have great influence on the production, an alarm is given to remind on-site operators of timely replacing the water gap so as to avoid the casting stop or quality defect.
Embodiment III
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 similar computing means.
Fourth embodiment
The present invention provides a computer-readable storage medium storing a computer program for executing the above method for determining an abnormal state of a mold.
In particular, computer-readable storage media, including both permanent and non-permanent, removable and non-removable media, may be used to 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 Disks (DVD) or other optical storage, magnetic cassettes, magnetic tape magnetic disk storage or other magnetic storage devices, or any other non-transmission medium, which can be used to store information that can be accessed by a computing device. Computer-readable storage media, as defined herein, does not include transitory computer-readable media (transmission media), such as modulated data signals and carrier waves.
It will be appreciated by those skilled in the art that 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 flowchart illustrations and/or block diagrams, and combinations of flows and/or blocks in the flowchart illustrations 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 foregoing is illustrative of the present invention and is not to be construed as limiting the scope of the invention. Any equivalent changes and modifications can be made by those skilled in the art without departing from the spirit and principles of this invention, and are intended to be within the scope of this invention.
Claims (7)
1. A method for judging abnormal states of nodulation and blockage 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 of the temperature measuring points, an isothermal line graph in the crystallizer is obtained;
determining the liquid level position of molten steel in the crystallizer according to the isothermal line graph, and monitoring the fluctuation condition of the liquid level;
determining the nodulation position and the blocking degree of the crystallizer according to the fluctuation condition of the liquid level;
copper plates are arranged on four side surfaces of the crystallizer, a plurality of temperature measuring holes are uniformly and alternately formed in one wide surface of the copper plate, and temperature measuring optical fibers are respectively arranged in the temperature measuring holes so that the temperature measuring optical fibers are completely buried in the crystallizer;
the distance between two adjacent temperature measuring points is greater than or equal to 5mm, and the distribution of the temperature measuring points is sparse when the distance is closer to the bottom of the copper plate;
determining the nodulation position and the blockage degree of the crystallizer according to the fluctuation condition of the liquid level, wherein the method comprises the following steps of: if the position of the peak point of the liquid level fluctuation deviates to the central position of the inner cavity of the immersed nozzle of the crystallizer and the amplitude of the liquid level fluctuation is reduced, the inner cavity of the immersed nozzle of the crystallizer is subject to a nodulation phenomenon; 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 immersed nozzle of the crystallizer; if the liquid level is in asymmetric fluctuation, a single-side nodulation phenomenon occurs in the inner cavity of the immersed nozzle of the crystallizer or at the outlet of the immersed nozzle of the crystallizer.
2. The method for determining abnormal state of clogging of a submerged nozzle of a mold according to claim 1, wherein the measuring the temperature of a plurality of temperature measuring points on the mold comprises:
a plurality of gratings are formed on each temperature measuring optical fiber to form the temperature measuring points;
and each temperature measuring optical fiber respectively collects the temperature of each temperature measuring point.
3. The method for determining abnormal state of clogging of a submerged nozzle of a mold according to claim 1, wherein the obtaining an isothermal line graph in the mold based on the temperature values at each of the temperature measuring points comprises:
forming a temperature field in the crystallizer through the temperature value of each temperature measuring point;
and obtaining an isothermal line graph of the temperature field according to the temperature field.
4. The method for determining abnormal state of clogging of a submerged nozzle of a mold according to claim 1, wherein the obtaining an isothermal line graph in the mold based on the temperature values at each of the temperature measuring points comprises:
and respectively obtaining a connecting curve of the temperature value on each temperature measuring point in a normal state and a connecting curve of the temperature value on each temperature measuring point in a nodulation state through a model algorithm.
5. The method according to claim 4, wherein the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the state where the clogging occurs are fitted to each other in a high order to obtain fitting curves of the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the state where the clogging occurs, respectively.
6. The method according to claim 4, wherein the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state are subjected to three times of B-spline interpolation processing, respectively, to obtain interpolation curves of the temperature values at the temperature measuring points in the normal state and the temperature values at the temperature measuring points in the nodulation state.
7. The method for determining abnormal state of clogging of a submerged nozzle of a mold according to claim 4, wherein the characteristic value of the liquid surface is extracted by the curve;
the characteristic value includes a fluctuation speed of the liquid surface and an amplitude of a peak point position of the liquid surface fluctuation.
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| CN101941060A (en) * | 2010-09-19 | 2011-01-12 | 河北钢铁股份有限公司唐山分公司 | Crystallizer thermography real-time display method based on multirow actual measurement thermocouple temperature |
| EP3222370B1 (en) * | 2014-11-19 | 2020-08-26 | Posco | Meniscus flow control device and meniscus flow control method using same |
| CN107357953A (en) * | 2017-06-02 | 2017-11-17 | 首钢总公司 | A kind of method that nozzle blocking is analyzed according to heat flow density |
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