CN117047094A - Tundish lower nozzle perforation detection and treatment method - Google Patents
Tundish lower nozzle perforation detection and treatment method Download PDFInfo
- Publication number
- CN117047094A CN117047094A CN202311061930.3A CN202311061930A CN117047094A CN 117047094 A CN117047094 A CN 117047094A CN 202311061930 A CN202311061930 A CN 202311061930A CN 117047094 A CN117047094 A CN 117047094A
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- China
- Prior art keywords
- tundish
- casting
- lower nozzle
- crystallizer
- nozzle
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- 238000000034 method Methods 0.000 title claims abstract description 22
- 238000001514 detection method Methods 0.000 title description 4
- 238000005266 casting Methods 0.000 claims abstract description 39
- 239000002893 slag Substances 0.000 claims abstract description 25
- 239000007788 liquid Substances 0.000 claims abstract description 23
- 238000009749 continuous casting Methods 0.000 claims abstract description 13
- 229910000831 Steel Inorganic materials 0.000 claims abstract description 12
- 239000010959 steel Substances 0.000 claims abstract description 12
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 11
- 229910052802 copper Inorganic materials 0.000 claims abstract description 11
- 239000010949 copper Substances 0.000 claims abstract description 11
- 238000012545 processing Methods 0.000 claims abstract description 11
- 230000004907 flux Effects 0.000 claims abstract description 8
- 238000012544 monitoring process Methods 0.000 claims abstract description 7
- 230000008520 organization Effects 0.000 claims abstract description 6
- 230000000007 visual effect Effects 0.000 claims description 14
- 238000003384 imaging method Methods 0.000 claims description 9
- 238000009628 steelmaking Methods 0.000 abstract description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 abstract description 2
- 239000000843 powder Substances 0.000 description 7
- 230000008859 change Effects 0.000 description 4
- 230000003628 erosive effect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000000694 effects Effects 0.000 description 1
- 238000011010 flushing procedure Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000011002 quantification Methods 0.000 description 1
- 230000003068 static effect Effects 0.000 description 1
Classifications
-
- B—PERFORMING OPERATIONS; TRANSPORTING
- B22—CASTING; POWDER METALLURGY
- B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/52—Manufacturing or repairing thereof
-
- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02P—CLIMATE CHANGE MITIGATION TECHNOLOGIES IN THE PRODUCTION OR PROCESSING OF GOODS
- Y02P10/00—Technologies related to metal processing
- Y02P10/20—Recycling
Landscapes
- Engineering & Computer Science (AREA)
- Manufacturing & Machinery (AREA)
- Mechanical Engineering (AREA)
- Continuous Casting (AREA)
Abstract
The invention belongs to the technical field of steelmaking continuous casting, and relates to a method for detecting and processing a tundish drain port perforation, which comprises the following steps: s1, monitoring the temperature of the outer side of a copper plate of the crystallizer at a position corresponding to a liquid slag layer of mold flux in the crystallizer in real time in the casting process, and judging that a water outlet of the tundish is perforated when the temperature at the position is instantaneously increased by more than 10 ℃ and the duration time is longer than 10 seconds than the temperature in normal casting; s2, automatically reducing the pulling speed to below 0.6m/min by the continuous casting machine, and replacing a tundish drain outlet by organization personnel; s3, after the replacement of the tundish nozzle is completed, normal casting at the typical pulling speed is recovered according to the casting period. The invention can detect whether the tundish lower nozzle is perforated on line, and rapidly process after confirming that the tundish lower nozzle is perforated, thereby reducing the incidence of casting blank quality problems caused by the perforation of the tundish lower nozzle and the incidence of steel leakage accidents caused by the perforation of the tundish lower nozzle.
Description
Technical Field
The invention belongs to the technical field of steelmaking continuous casting, and relates to a detection and treatment method for detecting a tundish nozzle perforation.
Background
At present, continuous casting steel is mainly used for prolonging the service life of a tundish drain outlet by adjusting the position of a slag line. The main reason for perforation of the tundish nozzle is that the erosion of the slag layer of the casting powder liquid to the periphery of the tundish nozzle is uneven. With the increase of the service time of the tundish nozzle, the erosion degree of the liquid slag layer in the covering slag to the tundish nozzle is more and more serious, and finally, the tundish nozzle is perforated and even broken.
However, no quantitative standard is available at present to judge whether the tundish nozzle is perforated, meanwhile, the crystallizer is required to be subjected to black slag operation, and operators can hardly distinguish whether the tundish nozzle is perforated in a visual observation mode, so that serious accidents are easily caused once the tundish nozzle is not timely found. Especially, the result of perforation in the inner arc direction and the outer arc direction of the pouring spout of the tundish is more serious, the blank shell is thinned due to continuous flushing of molten steel at the perforation position on the primary blank shell, and the weak blank shell can not bear huge molten steel static pressure after being pulled out of the crystallizer, so that steel leakage accidents occur.
Therefore, a specific and definite judging method is needed at present to detect whether the tundish lower nozzle is perforated or not, and when the tundish lower nozzle is perforated, the tundish lower nozzle is rapidly processed, so that production accidents caused by the tundish lower nozzle perforation are avoided.
Disclosure of Invention
In view of the above, the present invention aims to provide a method for detecting and processing a perforation of a tundish nozzle, which is characterized in that a thermocouple built in a crystallizer is used for monitoring temperature change of a position, close to a slag layer in mold casting powder, of a copper plate of the crystallizer, and when the temperature is instantaneously increased and is 10 ℃ or more and longer than 10 seconds than the temperature in normal casting, the perforation of the tundish nozzle can be judged, so that steel leakage accidents and casting blank quality problems caused by perforation of the tundish nozzle are avoided.
In order to achieve the above purpose, the present invention provides the following technical solutions:
a method for detecting and processing a tundish nozzle perforation comprises the following steps:
s1, monitoring the temperature of the outer side of a copper plate of the crystallizer at the position corresponding to a liquid slag layer of mold flux in the crystallizer in real time in the casting process, and judging that the tundish nozzle is perforated when the temperature at the position is instantaneously increased by more than 10 ℃ and the duration time exceeds 10 seconds compared with the temperature in normal casting.
Further, the method also comprises the following steps:
s2, automatically reducing the pulling speed to below 0.6m/min by the continuous casting machine, and replacing a tundish drain outlet by organization personnel;
s3, after the replacement of the tundish nozzle is completed, normal casting at the typical pulling speed is recovered according to the casting period.
Further, the method also comprises the following steps:
s21: after the tundish lower nozzle is judged to be perforated in the step S1, the molten steel casting liquid level in the crystallizer is reduced through a casting liquid level control system, so that the slag line position at the position, corresponding to the liquid slag layer of the casting slag, on the tundish lower nozzle is exposed, a visual imaging system captures a picture and judges the perforated position of the tundish lower nozzle, and an audible and visual alarm device which is controlled in an interlocking manner with the visual imaging system starts to alarm after the visual imaging system captures the picture and judges the perforated position of the tundish lower nozzle;
after the on-site operator hears the alarm, the corresponding captain organization personnel of the continuous casting machine replace the tundish nozzle.
Further, the pulling speed of the continuous casting machine is controlled by a withdrawal and straightening machine, and after the tundish nozzle is perforated, the pulling speed is reduced to 0.6m/min.
Further, the device also comprises a thermocouple which is arranged in the crystallizer and is arranged on the crystallizer, the height of the thermocouple corresponds to the height of the liquid slag layer of the casting powder, and the thermocouple is used for monitoring the temperature of the outer side of the copper plate of the crystallizer at the position corresponding to the height of the liquid slag layer of the casting powder in the crystallizer in real time.
The invention has the beneficial effects that:
the invention provides a detection and treatment method for perforation of a tundish lower nozzle, which is characterized in that the perforation of the tundish lower nozzle is judged by monitoring the temperature change of the position, corresponding to the liquid slag layer of mold flux, of the outer side of a crystallizer copper plate and in a crystallizer in real time, and when the temperature of the position is instantaneously increased by more than 10 ℃ and the duration exceeds 10 seconds compared with the temperature in normal casting, the perforation of the tundish lower nozzle can be detected on line, a judgment mode capable of standard quantification is provided, an operator is not required to judge in a mode of visual observation, and erroneous judgment is avoided;
after perforation of the tundish lower nozzle is confirmed, a treatment method is provided, so that the tundish lower nozzle perforation fault can be rapidly treated, and the occurrence rate of casting blank quality problems caused by tundish lower nozzle perforation and the occurrence rate of steel leakage accidents caused by tundish lower nozzle perforation are reduced.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objects and other advantages of the invention may be realized and obtained by means of the instrumentalities and combinations particularly pointed out in the specification.
Drawings
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the present invention will be described in the following preferred detail with reference to the accompanying drawings, in which:
fig. 1 is a flow chart of a method for detecting a tundish nozzle perforation in an embodiment.
Detailed Description
Other advantages and effects of the present invention will become apparent to those skilled in the art from the following disclosure, which describes the embodiments of the present invention with reference to specific examples. The invention may be practiced or carried out in other embodiments that depart from the specific details, and the details of the present description may be modified or varied from the spirit and scope of the present invention. It should be noted that the illustrations provided in the following embodiments merely illustrate the basic idea of the present invention by way of illustration, and the following embodiments and features in the embodiments may be combined with each other without conflict.
Wherein the drawings are for illustrative purposes only and are shown in schematic, non-physical, and not intended to limit the invention; for the purpose of better illustrating embodiments of the invention, certain elements of the drawings may be omitted, enlarged or reduced and do not represent the size of the actual product; it will be appreciated by those skilled in the art that certain well-known structures in the drawings and descriptions thereof may be omitted.
The same or similar reference numbers in the drawings of embodiments of the invention correspond to the same or similar components; in the description of the present invention, it should be understood that, if there are terms such as "upper", "lower", "left", "right", "front", "rear", etc., that indicate an azimuth or a positional relationship based on the azimuth or the positional relationship shown in the drawings, it is only for convenience of describing the present invention and simplifying the description, but not for indicating or suggesting that the referred device or element must have a specific azimuth, be constructed and operated in a specific azimuth, so that the terms describing the positional relationship in the drawings are merely for exemplary illustration and should not be construed as limiting the present invention, and that the specific meaning of the above terms may be understood by those of ordinary skill in the art according to the specific circumstances.
Referring to fig. 1, a method for detecting and processing a tundish nozzle perforation specifically includes the following steps:
1. the temperature of the outer side of the crystallizer copper plate at the position corresponding to the liquid slag layer of the casting powder in the crystallizer is monitored in real time through a thermocouple in the casting process, and when the temperature at the position is suddenly increased and is 10 ℃ higher than the temperature in normal casting and the duration time is longer than 10 seconds, the occurrence of perforation of the tundish water outlet can be judged; the thermocouple is arranged in the shell of the crystallizer and is positioned at the height of the liquid slag layer in the mold flux so as to monitor the temperature of the outer side of the copper plate of the crystallizer at the position corresponding to the height of the liquid slag layer in the mold flux; the outer side of the crystallizer copper plate refers to the side of the crystallizer copper plate far away from molten steel.
2. Reducing the pulling speed of the continuous casting machine to 0.6m/min by controlling a pulling and straightening machine so as to ensure that the initial green shell of the casting blank reaches a safe thickness;
3. the casting liquid level control system is used for reducing the casting liquid level of molten steel in the crystallizer, so that the liquid level of the casting powder is reduced, the position of a tundish lower nozzle close to a slag line of a liquid slag layer in the casting powder is exposed, the visual imaging system captures a picture and judges the perforation position of the tundish lower nozzle, and the visual imaging system captures the picture and judges the perforation position of the tundish lower nozzle, and then an audible and visual alarm device which is controlled in an interlocking manner with the visual imaging system starts to alarm;
4. after the operator hears an alarm, the operator carries out quick change operation on the tundish nozzle by the corresponding captain organization personnel of the continuous casting machine so as to avoid causing unplanned casting;
5. and after the quick change of the tundish nozzle is finished, recovering the typical pull-up speed for normal casting according to the casting period.
The invention provides a method for detecting and processing perforation of a tundish lower nozzle, which can be used for detecting whether perforation occurs in the tundish lower nozzle on line, and rapidly processing after confirming that perforation occurs in the tundish lower nozzle, so that the occurrence rate of casting blank quality problems caused by perforation of the tundish lower nozzle and the occurrence rate of steel leakage accidents caused by perforation of the tundish lower nozzle are reduced.
Finally, it is noted that the above embodiments are only for illustrating the technical solution of the present invention and not for limiting the same, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications and equivalents may be made thereto without departing from the spirit and scope of the present invention, which is intended to be covered by the claims of the present invention.
Claims (5)
1. The method for detecting and processing the tundish nozzle perforation is characterized by comprising the following steps of:
s1, monitoring the temperature of the outer side of a copper plate of the crystallizer at the position corresponding to a liquid slag layer of mold flux in the crystallizer in real time in the casting process, and judging that the tundish nozzle is perforated when the temperature at the position is instantaneously increased by more than 10 ℃ and the duration time exceeds 10 seconds compared with the temperature in normal casting.
2. The method for detecting and processing tundish nozzle perforations according to claim 1, further comprising the steps of:
s2, automatically reducing the pulling speed to below 0.6m/min by the continuous casting machine, and replacing a tundish drain outlet by organization personnel;
s3, after the replacement of the tundish nozzle is completed, normal casting at the typical pulling speed is recovered according to the casting period.
3. The method for detecting and processing the perforation of the lower nozzle of the tundish according to claim 2, further comprising the steps of:
s21: after the tundish lower nozzle is judged to be perforated in the step S1, the molten steel casting liquid level in the crystallizer is reduced through a casting liquid level control system, so that the slag line position at the position, corresponding to the liquid slag layer of the casting slag, on the tundish lower nozzle is exposed, a visual imaging system captures a picture and judges the perforated position of the tundish lower nozzle, and an audible and visual alarm device which is controlled in an interlocking manner with the visual imaging system starts to alarm after the visual imaging system captures the picture and judges the perforated position of the tundish lower nozzle;
after the on-site operator hears the alarm, the corresponding captain organization personnel of the continuous casting machine replace the tundish nozzle.
4. The method for detecting and processing the perforation of the tundish lower nozzle according to claim 2, wherein the method comprises the following steps: the drawing speed of the continuous casting machine is controlled by a drawing and straightening machine, and after the tundish drain outlet is perforated, the drawing and straightening machine reduces the drawing speed of the continuous casting machine to 0.6m/min.
5. The method for detecting and processing the perforation of the tundish lower nozzle according to claim 1, wherein the method comprises the following steps: the device comprises a thermocouple which is arranged in a shell of a crystallizer and is arranged on the crystallizer, wherein the height of the thermocouple corresponds to the height of a liquid slag layer of the mold flux, and the thermocouple is used for monitoring the temperature of the position, outside a copper plate of the crystallizer, of the position, corresponding to the height of the liquid slag layer of the mold flux in the crystallizer in real time.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311061930.3A CN117047094A (en) | 2023-08-22 | 2023-08-22 | Tundish lower nozzle perforation detection and treatment method |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202311061930.3A CN117047094A (en) | 2023-08-22 | 2023-08-22 | Tundish lower nozzle perforation detection and treatment method |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN117047094A true CN117047094A (en) | 2023-11-14 |
Family
ID=88658590
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202311061930.3A Pending CN117047094A (en) | 2023-08-22 | 2023-08-22 | Tundish lower nozzle perforation detection and treatment method |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN117047094A (en) |
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2023
- 2023-08-22 CN CN202311061930.3A patent/CN117047094A/en active Pending
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