CN110449569B - Submerged nozzle slag line adjusting method - Google Patents
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- CN110449569B CN110449569B CN201910860372.4A CN201910860372A CN110449569B CN 110449569 B CN110449569 B CN 110449569B CN 201910860372 A CN201910860372 A CN 201910860372A CN 110449569 B CN110449569 B CN 110449569B
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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
- B22D41/00—Casting melt-holding vessels, e.g. ladles, tundishes, cups or the like
- B22D41/50—Pouring-nozzles
- B22D41/56—Means for supporting, manipulating or changing a pouring-nozzle
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Abstract
The invention discloses a slag line adjusting method for an immersion type water gap, which comprises the following steps: after the new tundish is poured or the submerged nozzle is replaced, setting the liquid level of the crystallizer at a preset liquid level, wherein the preset liquid level is in a range of up-down floating preset values in the central line of an adjustable range corresponding to the liquid level, and the immersion depth of the submerged nozzle is set at an initial depth; and adjusting the immersion depth of the submerged nozzle upwards or downwards by a first preset height every other preset number of furnaces from the second furnace, and adjusting the immersion depth of the submerged nozzle reversely by a second preset height every other preset number of furnaces after the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction. By applying the submerged nozzle slag line adjusting method provided by the invention, the problem that the casting powder cannot normally flow in due to unsteady-state casting can be counteracted because the stability of the flow field in the crystallizer is excellent, and then the steel leakage can be avoided. Meanwhile, the liquid level fluctuation of the crystallizer caused by people can be reduced, and the risk of causing the steel leakage problem is further reduced.
Description
Technical Field
The invention relates to the technical field of continuous casting processes, in particular to a slag line adjusting method for an immersion type water gap.
Background
The liquid level control of the crystallizer is stable, and the method is an effective means for ensuring the normal production of a continuous casting machine, improving the continuous casting production and improving the quality of casting blanks. The fluctuation of the liquid level can cause poor melting of the mold powder and a great amount of inclusion entrainment, which not only affects the quality of the casting blank, but also can possibly cause the occurrence of steel overflow and steel leakage accidents in the pouring process.
In a continuous casting operation, after a new tundish is poured or a submerged nozzle is replaced, a steel caster usually sets the liquid level of a crystallizer at the lowest position (for example, -120mm), and then the two furnaces for casting steel are adjusted upwards by 10 mm. As the pouring and the replacement of the submerged nozzle of the new tundish belong to unsteady state casting, compared with steady state casting, the pouring and the replacement of the submerged nozzle of the new tundish are lower in pulling speed (such as 0.3-0.6 m/min), and the casting powder is not suitable (such as the designed pulling speed of 0.8-1.3 m/min). And the argon gas is not properly required to be adjusted after the new ladle is used for casting and the water gap is changed, and the liquid level in the crystallizer is not stable in the adjusting process. The casting powder structure in the crystallizer can be damaged when a new immersion nozzle is put in and an old immersion nozzle is taken out, impurities in the old nozzle fall into the casting powder to influence the flowing performance of the casting powder, and the like, so that the flowing of the casting powder is blocked to generate steel leakage alarm.
In summary, how to effectively solve the problems of easy steel leakage and the like after the pouring of a new tundish or the replacement of an immersion nozzle is completed is a problem to be solved by the technical personnel in the field at present.
Disclosure of Invention
In view of the above, the present invention provides a submerged nozzle slag line adjusting method, which can effectively solve the problem of steel leakage easily caused after a new tundish is poured or a submerged nozzle is replaced.
In order to achieve the purpose, the invention provides the following technical scheme:
a submerged nozzle slag line adjusting method comprises the following steps:
after the new tundish is poured or the submerged nozzle is replaced, setting the liquid level of the crystallizer at a preset liquid level, wherein the preset liquid level is in a range of up-down floating preset values of a central line of an adjustable range corresponding to the liquid level, and the immersion depth of the submerged nozzle is set at an initial depth;
and adjusting the immersion depth of the submerged nozzle upwards or downwards by a first preset height every other preset number of furnaces from the second furnace, and adjusting the immersion depth of the submerged nozzle reversely by a second preset height every other preset number of furnaces after the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction.
Preferably, in the above method for adjusting the slag line of the submerged nozzle, the submerged nozzle is immersed at a first preset height in each half of the furnace from the second furnace, and when the submerged nozzle reaches an extreme value corresponding to the first preset height, the submerged nozzle is immersed at a second preset height in each half of the furnace.
Preferably, in the above method for adjusting the submerged nozzle slag line, the first preset height is equal to the second preset height.
Preferably, in the submerged nozzle slag line adjusting method, the first preset height and the second preset height are both 3-5 mm.
Preferably, in the submerged nozzle slag line adjusting method, the first preset height and the second preset height are both 4 mm.
Preferably, in the submerged nozzle slag line adjusting method, the initial depth corresponds to a middle position of the slag line.
Preferably, in the above method for adjusting a slag line of a submerged nozzle, the submerged nozzle is immersed at a first predetermined height at every predetermined number of furnaces from a second furnace, and the submerged nozzle is immersed at a second predetermined height at every predetermined number of furnaces after the submerged nozzle reaches a minimum value.
By applying the submerged nozzle slag line adjusting method provided by the invention, after a new tundish is poured or a submerged nozzle is replaced, the liquid level of the crystallizer is set in the central line of the adjustable range corresponding to the liquid level or the range of the preset value floating up and down from the central line. When the liquid level is at the midline, the flow field of the crystallizer is the best, so the liquid level is arranged near the midline, and the stability of the flow field can be ensured. And then in the improper in-process of adjusting of argon gas, and when new immersion nozzle put into with old immersion nozzle take out, perhaps when the inclusion dropped into the covering slag in the old mouth of a river influences the covering slag flow property and causes the covering slag to flow into and be obstructed, because flow field stability is excellent in the crystallizer, can offset the covering slag that the unsteady state casting brought and can not normally flow in, and then can avoid the bleed-out. Meanwhile, the immersion depth of the submerged nozzle is adjusted to a first preset height every other preset number of furnaces from the second furnace, and when the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction, the immersion depth of the submerged nozzle is reversely adjusted to a second preset height every other preset number of furnaces. And the liquid level fluctuation of the crystallizer caused by people can be reduced, and the risk of causing the steel leakage problem is further reduced.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings used in the description of the embodiments or the prior art will be briefly described below, it is obvious that the drawings in the following description are only some embodiments of the present invention, and for those skilled in the art, other drawings can be obtained according to the drawings without creative efforts.
FIG. 1 is a schematic flow chart of a submerged nozzle slag line adjusting method according to an embodiment of the present invention;
fig. 2 is a schematic flow chart of a submerged nozzle slag line adjusting method according to another embodiment of the present invention.
Detailed Description
The embodiment of the invention discloses a submerged nozzle slag line adjusting method, which aims to reduce the risk of causing a steel leakage problem and reduce the steel leakage times.
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the drawings in the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
Referring to fig. 1, fig. 1 is a schematic flow chart of a slag line adjustment method for a submerged nozzle according to an embodiment of the present invention.
In one embodiment, the submerged nozzle slag line adjusting method provided by the invention comprises the following steps:
s11: after the new tundish is poured or the submerged nozzle is replaced, the liquid level of the crystallizer is set to be a preset liquid level, the preset liquid level is in a range of up-down floating preset values of the central line of an adjustable range corresponding to the liquid level, and the immersion depth of the submerged nozzle is set to be an initial depth.
In the continuous casting technology, in order to improve the quality of a casting blank, an immersion nozzle is arranged between a tundish and a crystallizer and mainly used for preventing secondary oxidation and nitridation of molten steel and splashing of the molten steel; adjusting the flowing state and the injection speed of the molten steel; the non-metallic inclusion of the covering slag is prevented from being involved in the molten steel, and the important function of promoting the floating of the inclusion in the molten steel is played; the side casting and drawing yield and the casting blank quality are decisively influenced. The submerged nozzle is installed at the bottom of the tundish and inserted into the crystallizer.
After the new tundish is poured or the submerged nozzle is replaced, the liquid level of the crystallizer is set in the range of the up-and-down floating preset value at the center of the adjustable range corresponding to the liquid level of the crystallizer, namely the liquid level of the crystallizer is set in the middle range instead of the conventional lowest value. When the liquid level of the crystallizer is at the central line of the adjustable range, the flow field of the crystallizer is the best. And by considering factors such as operation errors and the like, the liquid level of the crystallizer is controlled within a certain range taking the central line as the center, so that a better flow field can be ensured. Specifically, when the liquid level adjustment range of the crystallizer is-60 to-120 mm, the central line is-90 mm, namely, the flow is optimal when the liquid level of the crystallizer is set to-90 mm. The preset value can be set to be 10mm, and the preset liquid level is correspondingly-80 to-100 mm. The specific preset value can be set according to the size of the liquid level adjusting range of the crystallizer, and is not limited specifically here.
The immersion depth of the submerged nozzle is set at an initial depth, and the specific initial depth can be obtained by a conventional algorithm for calculating the immersion depth through parameters such as a crystallizer liquid level detection value. In particular, the middle position of the slag line can be corresponded. When the liquid level of the crystallizer is set at the center line of the adjustable range, the immersion depth of the submerged nozzle is set at the middle position of the slag line; when the liquid level of the crystallizer is set at a preset value of up-and-down floating of the center line of the adjustable range, the immersion depth of the submerged nozzle is correspondingly set at a certain value of up-and-down floating of the middle position of the slag line.
S12: and adjusting the immersion depth of the submerged nozzle upwards or downwards by a first preset height every other preset number of furnaces from the second furnace, and adjusting the immersion depth of the submerged nozzle reversely by a second preset height every other preset number of furnaces after the immersion depth of the submerged nozzle reaches the extreme value corresponding to the direction.
The preset number of furnaces is preferably half furnaces, that is, the immersion depth of the submerged nozzle is adjusted upward or downward by a first preset height every half furnace from the second furnace, and when the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction, the immersion depth of the submerged nozzle is adjusted reversely by a second preset height every half furnace. The adjustment is carried out once per half furnace, the adjustment frequency is improved, the adjustment amplitude can be reduced every time, and the problems of bleed-out and the like caused by artificial crystallizer liquid level fluctuation due to overlarge slag line adjustment amplitude are avoided.
The specific size of the first preset height and the second preset height can be set as required, and the first preset height and the second preset height can be the same or different in size.
Specifically, the range of the first preset height and the range of the second preset height are both 3-5 mm. Preferably, the first preset height and the second preset height are both 4 mm. In the prior art, the steel slag line of two furnaces is adjusted by 10mm upwards, the amplitude of the slag line of a water gap for replacing the two furnaces is too large, and the liquid level fluctuation of a crystallizer caused by human factors can also cause steel leakage alarm. In the embodiment, the slag line adjusting range of each half furnace is 3-5mm, preferably 4mm, which is significantly lower than 10mm in the prior art, and the problems of artificial crystallizer liquid level fluctuation and steel leakage caused by the artificial crystallizer liquid level fluctuation are not easily caused.
By applying the submerged nozzle slag line adjusting method provided by the invention, after a new tundish is poured or a submerged nozzle is replaced, the liquid level of the crystallizer is set in the central line of the adjustable range corresponding to the liquid level or the range of the preset value floating up and down from the central line. When the liquid level is at the midline, the flow field of the crystallizer is the best, so the liquid level is arranged near the midline, and the stability of the flow field can be ensured. And then in the improper in-process of adjusting of argon gas, and when new immersion nozzle put into with old immersion nozzle take out, perhaps when the inclusion dropped into the covering slag in the old mouth of a river influences the covering slag flow property and causes the covering slag to flow into and be obstructed, because flow field stability is excellent in the crystallizer, can offset the covering slag that the unsteady state casting brought and can not normally flow in, and then can avoid the bleed-out. Meanwhile, the immersion depth of the submerged nozzle is adjusted to a first preset height every other preset number of furnaces from the second furnace, and when the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction, the immersion depth of the submerged nozzle is reversely adjusted to a second preset height every other preset number of furnaces. And the liquid level fluctuation of the crystallizer caused by people can be reduced, and the risk of causing the steel leakage problem is further reduced.
On the basis of the foregoing embodiments, step S12 specifically includes: and (3) adjusting the immersion depth of the submerged nozzle downwards by a first preset height every other preset number of furnaces from the second furnace, and adjusting the immersion depth of the submerged nozzle upwards by a second preset height every other preset number of furnaces after the immersion depth of the submerged nozzle reaches the lowest value. Namely, the slag line is adjusted to be downwards adjusted firstly, and then is adjusted to be upwards adjusted when the slag line is adjusted to be the lowest value. The slag line is firstly adjusted downwards and then upwards, so that the steel leakage can be avoided to the greatest extent.
According to the requirement, the immersion depth of the submerged nozzle can be adjusted upwards by a first preset height every other preset number of furnaces from the second furnace, and when the immersion depth of the submerged nozzle reaches the maximum value, the immersion depth of the submerged nozzle is adjusted downwards by a second preset height every other preset number of furnaces. Namely, the slag line is adjusted to be upward firstly, and then is adjusted to be downward when the slag line is adjusted to the highest value. The slag line is firstly upwards and then downwards adjusted, so that the steel leakage can be more effectively avoided compared with the upward adjustment from the lowest value, but the effect is slightly worse than the upward adjustment from the lowest value.
Referring to fig. 2, fig. 2 is a schematic flow chart illustrating a slag line adjustment method for a submerged nozzle according to another embodiment of the present invention. In the slag line adjusting method for the submerged nozzle provided by the embodiment, the method comprises the following steps:
s21: after the new tundish is poured or the submerged nozzle is replaced, setting the liquid level of the crystallizer at a preset liquid level, wherein the preset liquid level is in a range of up-down floating preset values in the central line of an adjustable range corresponding to the liquid level, and the immersion depth of the submerged nozzle is set at an initial depth;
s22: the immersion depth of the submerged nozzle is adjusted 3-5mm downward for each half furnace from the second furnace, and the immersion depth of the submerged nozzle is adjusted 3-5mm upward for each half furnace after the immersion depth of the submerged nozzle reaches the lowest value.
After the new tundish is poured or the submerged nozzle is replaced, the liquid level of the crystallizer is set within the range of the up-and-down floating preset value of the center line of the adjustable range corresponding to the liquid level, the flow field of the crystallizer is best, and the problem that the casting powder cannot normally flow in due to unsteady-state casting is counteracted; and adjusting the slag line for one time downwards along with the later half furnace, wherein the slag line is adjusted by 3-5mm each time, and is adjusted upwards when the slag line reaches the lowest level, and the slag line is adjusted by 3-5mm each half furnace, so that the liquid level fluctuation of the artificial crystallizer is reduced.
Taking a specific continuous casting line as an example, the slag line is adjusted by setting the height of a liquid level detection value, and the flow field of the crystallizer meets the requirement when the liquid level adjustment range is-60 to-120 mm. The submerged nozzle slag line adjusting method comprises the following steps:
after the new tundish is poured or the submerged nozzle is replaced, setting the liquid level of the crystallizer at a preset liquid level, wherein the preset liquid level is within a range of up-and-down floating preset values of-90 mm, and the immersion depth of the submerged nozzle is set at an initial depth; the immersion depth of the submerged entry nozzle is adjusted 4mm downward for each half of the furnace from the second furnace, and the immersion depth of the submerged entry nozzle is adjusted 4mm upward for each half of the furnace after the immersion depth of the submerged entry nozzle reaches the lowest value.
By adopting the method provided by the application, the steel leakage alarm is given 16 times in the process of casting and water port changing for a new ladle per month, the alarm is given 5 times in the process of adjusting the slag line, the waste judgment amount of casting blanks is reduced by 129.5 tons per month, and the benefit is created by 155.4 ten thousand yuan per year.
Before the method is applied, namely, after a new tundish is adopted for casting or an immersion nozzle is replaced, the liquid level of the crystallizer is set to be-120 mm, the corresponding immersion insertion depth is the shallowest, then, the slag line is adjusted upwards every two furnaces, and the adjustment amplitude is 10mm each time. Therefore, the alarm is given 43 times for the new ladle casting and the water changing port steel leakage in each month, the alarm is given 15 times in the slag line adjusting process, the casting blank waste judging amount is 203 tons in each month, and the production smooth operation is greatly interfered.
Therefore, the slag line adjusting method for the submerged nozzle provided by the application can be used for remarkably reducing the steel leakage alarming times.
The embodiments in the present description are described in a progressive manner, each embodiment focuses on differences from other embodiments, and the same and similar parts among the embodiments are referred to each other.
The previous description of the disclosed embodiments is provided to enable any person skilled in the art to make or use the present invention. Various modifications to these embodiments will be readily apparent to those skilled in the art, and the generic principles defined herein may be applied to other embodiments without departing from the spirit or scope of the invention. Thus, the present invention is not intended to be limited to the embodiments shown herein but is to be accorded the widest scope consistent with the principles and novel features disclosed herein.
Claims (4)
1. A submerged nozzle slag line adjusting method is characterized by comprising the following steps:
after the new tundish is poured or the submerged nozzle is replaced, setting the liquid level of the crystallizer at a preset liquid level, wherein the preset liquid level is in a range of up-down floating preset values of a central line of an adjustable range corresponding to the liquid level, and the immersion depth of the submerged nozzle is set at an initial depth;
adjusting the immersion depth of the submerged nozzle upwards or downwards by a first preset height every other preset number of furnaces from a second furnace, and adjusting the immersion depth of the submerged nozzle reversely by a second preset height every other preset number of furnaces after the immersion depth of the submerged nozzle reaches an extreme value corresponding to the direction;
when the liquid level of the crystallizer is set to a preset value of up-and-down floating of the center line of the adjustable range, the immersion depth of the submerged nozzle is correspondingly set to a certain value of up-and-down floating of the middle position of the slag line; the first preset height is equal to the second preset height; the first preset height and the second preset height are both 3-5mm in range.
2. The submerged entry nozzle slag line adjusting method of claim 1, wherein the submerged entry nozzle is immersed at a first predetermined height in each half of the furnace from the second furnace, and the submerged entry nozzle is immersed at a second predetermined height in each half of the furnace after the submerged entry nozzle reaches an extreme value corresponding to the first predetermined height.
3. The submerged entry nozzle slag line adjustment method of claim 1, wherein the first predetermined height and the second predetermined height are both 4 mm.
4. The submerged entry nozzle slag line adjusting method of any one of claims 1 to 3, characterized in that the submerged entry depth of the submerged entry nozzle is adjusted downward by a first preset height every predetermined number of furnaces from a second furnace, and the submerged entry depth of the submerged entry nozzle is adjusted upward by a second preset height every predetermined number of furnaces after the submerged entry depth of the submerged entry nozzle reaches a minimum value.
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| CN111408698B (en) * | 2020-05-06 | 2021-06-29 | 攀钢集团西昌钢钒有限公司 | Control method for surface quality of high-strength high-aluminum high-vanadium steel casting blank |
| CN112059164B (en) * | 2020-08-13 | 2022-05-24 | 邢台钢铁有限责任公司 | Tundish submerged nozzle use method capable of prolonging service life |
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