CN117123750A - A method for adjusting the liquid level setting of the crystallizer by pouring times - Google Patents

A method for adjusting the liquid level setting of the crystallizer by pouring times Download PDF

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Publication number
CN117123750A
CN117123750A CN202311097201.3A CN202311097201A CN117123750A CN 117123750 A CN117123750 A CN 117123750A CN 202311097201 A CN202311097201 A CN 202311097201A CN 117123750 A CN117123750 A CN 117123750A
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liquid level
value
crystallizer
copper plate
casting
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CN117123750B (en
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彭霞林
向往
谢森林
肖磊
宋刚
李强奇
丁鹏飞
邓必荣
陈振文
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Hunan Valin Lianyuan Iron & Steel Co Ltd
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Hunan Valin Lianyuan Iron & Steel Co Ltd
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    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B22—CASTING; POWDER METALLURGY
    • B22D—CASTING OF METALS; CASTING OF OTHER SUBSTANCES BY THE SAME PROCESSES OR DEVICES
    • B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
    • B22D11/16—Controlling or regulating processes or operations
    • B22D11/18—Controlling or regulating processes or operations for pouring
    • B22D11/181—Controlling or regulating processes or operations for pouring responsive to molten metal level or slag level
    • 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
    • B22D11/04—Continuous casting of metals, i.e. casting in indefinite lengths into open-ended moulds
    • 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

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  • Engineering & Computer Science (AREA)
  • Mechanical Engineering (AREA)
  • Continuous Casting (AREA)

Abstract

本发明提供了一种分浇次调整结晶器液位设定的方法，包括以下步骤：采集结晶器内铜板的裂纹长度的历史数据以及结晶器满液位与空液位差值，计算液位波动值，采集结晶器的高位报警值a1、低位报警值a2、高位浇铸值b1以及低位浇铸值b2，得到结晶器的浇铸液位范围；并设定初始液位值，根据浇次的变化以及铜板表面状况进行浇铸。本发明根据浇次的变化，调整液位设定值，从而使得在不同浇次的浇铸过程中，渣线区域不重叠，避免铜板同一位置长时间受到渣线腐蚀，而导致产生钢卷出现横裂纹缺陷的技术问题。The invention provides a method for adjusting the liquid level setting of the crystallizer by pouring times, which includes the following steps: collecting historical data of the crack length of the copper plate in the crystallizer and the difference between the full liquid level and the empty liquid level of the crystallizer, and calculating the liquid level. Fluctuation value, collect the high alarm value a 1 , low alarm value a 2 , high casting value b 1 and low casting value b 2 of the crystallizer to obtain the casting liquid level range of the crystallizer; and set the initial liquid level value, according to the casting Casting is carried out according to the changes of times and the surface condition of the copper plate. The invention adjusts the liquid level setting value according to the change of pouring times, so that during the casting process of different pouring times, the slag line area does not overlap, avoiding the same position of the copper plate being corroded by the slag line for a long time, which causes the steel coil to appear horizontally. Technical issues with crack defects.

Description

Method for adjusting crystallizer liquid level setting by casting times
Technical Field
The application relates to the technical field of continuous casting production, in particular to a method for adjusting crystallizer liquid level setting by casting times.
Background
In the high-pulling-speed continuous casting production process, the problems of overhigh surface temperature and overlarge thermal stress easily occur at the position of a crystallizer copper plate slag line, so that the mechanical property is poor, and the defects of thermal fatigue, cracking and scratch are generated. These problems affect the surface quality of the cast blank, and further cause transverse crack defects of the inverted "mountain peak" morphology of the steel coil. In order to slow down the erosion rate of the slag line position of the copper plate of the crystallizer and reduce the defects of cracks and scratches, the liquid level setting of the crystallizer in the continuous casting process needs to be adjusted.
In the related art, the mode of increasing the liquid level or reducing the liquid level along with the time change is adopted to avoid the slag line corroding the same position of the copper plate for a long time, but the problem that transverse crack defects appear in the steel coil still exists in practical application.
In view of the foregoing, there is a need for a method for adjusting the level setting of a crystallizer in multiple casting steps to solve the problems in the related art.
Disclosure of Invention
The application mainly aims to provide a method for adjusting the liquid level setting of a crystallizer by casting for multiple times, so as to solve the technical problem that transverse crack defects appear in steel coils in the related art.
In order to achieve the above purpose, the present application provides a method for adjusting the liquid level setting of a crystallizer by casting in different times, comprising the following steps:
s1: collecting historical data of crack length of copper plates in a crystallizer, calculating a liquid level fluctuation value delta h according to a difference delta S between full liquid level and empty liquid level of the crystallizer, and collecting a high-level alarm value a of the crystallizer 1 Low alarm value a 2 High cast value b 1 Low cast value b 2 The casting level range of the resulting mold was max (a 2 ，b 2 )～min(a 1 ，b 1 )；
S2: casting and setting an initial liquid level value; the difference between the liquid level set values meeting the former casting time and the latter casting time in the casting process is larger than the liquid level fluctuation value delta h, and the difference and sum of the liquid level set value and the liquid level fluctuation value delta h of any casting time are both in the casting liquid level range of the crystallizer; when the difference between the liquid level set value of a certain casting time and the double liquid level fluctuation value delta h is smaller than max (a 2 ，b 2 ) Step S3 is carried out;
s3: stopping casting, collecting the surface condition of the copper plate, evaluating the quality of the copper plate based on the crack condition, and judging that the evaluation value delta is more than or equal to delta 0 Returning to the step S2; when delta is less than delta 0 When the casting is stopped, the copper plate is replaced; the delta is 0 Indicating a copper plate pass threshold.
Preferably, the value range of the liquid level fluctuation value Δh is (Δh min ，Δh max ) The Deltah is min 、Δh max The expressions of (2) are as follows:
wherein θ represents an angle between the length of the nth crack of the copper plate and the horizontal direction of the crystallizer, (l) 1 ，l 2 ，...，l n ) Historical data set representing crack length of copper plate, l n Represents the length of the nth crack, and delta S represents the difference between the full liquid level and the empty liquid level of the crystallizer.
Preferably, the difference between the full level and the empty level of the crystallizer is the absolute value of the difference between the distance between the full level of the crystallizer and the upper edge of the copper plate and the distance between the empty level of the crystallizer and the upper edge of the copper plate.
Preferably, the value range of the crack length of the copper plate is 7-10mm.
Preferably, the method further comprises the steps of detecting the liquid level in the crystallizer through a liquid level detector, and closing the stopper rod if the detected value is larger than a set value; if the detection value is smaller than the set value, the stopper is opened.
Preferably, the insertion depths of the immersed nozzle of the crystallizer in different casting times are the same.
Preferably, the insertion depth is 90-110mm.
Preferably, copper plate pass threshold delta 0 The value of (2) is 8.
The application has the beneficial effects that:
according to the application, the liquid level set value is adjusted according to the change of the casting times, and the proper liquid level fluctuation value is obtained by calculation according to the historical data of the crack length of the copper plate and the difference value between the full liquid level and the empty liquid level of the crystallizer, so that the slag line area is not overlapped in the casting process of different casting times, the technical problem that the copper plate is corroded by the slag line for a long time at the same position to cause the occurrence of transverse crack defect of the steel coil is avoided, meanwhile, the liquid level fluctuation value is obtained by calculation according to the historical data of the crack length of the copper plate and the difference value between the full liquid level and the empty liquid level of the crystallizer, on one hand, the slag line can be prevented from being overlapped, the service life of the copper plate is prolonged, the product quality is improved, on the other hand, the utilization efficiency of the copper plate is improved, and the production cost is reduced.
Detailed Description
The following description of the embodiments of the present application will be made clearly and completely, and it is apparent that the described embodiments are only some embodiments of the present application, but not all embodiments. All other embodiments, which can be made by those skilled in the art based on the embodiments of the present application without making any inventive effort, are intended to fall within the scope of the present application.
It should be noted that all directional indicators (such as upper and lower … …) in the embodiments of the present application are merely used to explain the relative positional relationship, movement conditions, etc. between the components in a specific posture, and if the specific posture is changed, the directional indicators are changed accordingly.
Furthermore, descriptions such as those referred to as "first," "second," and the like, are provided for descriptive purposes only and are not to be construed as indicating or implying a relative importance or implying an order of magnitude of the indicated technical features in the present disclosure. Thus, a feature defining "a first" or "a second" may explicitly or implicitly include at least one such feature.
Moreover, the technical solutions of the embodiments of the present application may be combined with each other, but it is necessary to be based on the fact that those skilled in the art can implement the embodiments, and when the technical solutions are contradictory or cannot be implemented, it should be considered that the combination of the technical solutions does not exist, and is not within the scope of protection claimed by the present application.
In the process of continuous casting research, the inventor finds that the problem that the transverse crack defect of the steel coil still exists in practical application in a mode of increasing the liquid level or reducing the liquid level along with time in the related technology is as follows: the liquid level set value is only a theoretical value, and in the actual casting process, the liquid level value can fluctuate along with the injection of molten steel and the continuous casting pressing process, so that a slag line area before liquid level adjustment and a slag line area after adjustment in the related technology are partially overlapped, a copper plate positioned in the overlapped area is corroded by the slag line for a long time, and the production quality of a product is affected. In addition, the inventor also finds that the crack length of the copper plate is closely related to the liquid level fluctuation range through research, so the following technical scheme is provided:
the application provides a method for adjusting crystallizer liquid level setting by casting times, which comprises the following steps:
s1: collecting historical data of crack length of copper plates in a crystallizer, calculating a liquid level fluctuation value delta h according to a difference delta S between full liquid level and empty liquid level of the crystallizer, and collecting a high-level alarm value a of the crystallizer 1 Low alarm value a 2 High cast value b 1 Low cast value b 2 The casting level range of the resulting mold was max (a 2 ，b 2 )～min(a 1 ，b 1 )；
S2: casting and setting an initial liquid level value; the difference between the liquid level set values meeting the previous casting time and the subsequent casting time in the casting process is larger than the liquid level fluctuation value delta h, and the liquid level of any casting time is setThe difference value and the sum value of the value and the liquid level fluctuation value delta h are both positioned in the casting liquid level range of the crystallizer; when the difference between the liquid level set value of a certain casting time and the double liquid level fluctuation value delta h is smaller than max (a 2 ，b 2 ) Step S3 is carried out;
s3: stopping casting, collecting the surface condition of the copper plate, evaluating the quality of the copper plate based on the crack condition, and judging that the evaluation value delta is more than or equal to delta 0 Returning to the step S2; when delta is less than delta 0 When the casting is stopped, the copper plate is replaced; the delta is 0 Indicating a copper plate pass threshold.
According to the application, the liquid level set value is adjusted according to the change of the casting times, and the proper liquid level fluctuation value is obtained by calculation according to the historical data of the crack length of the copper plate and the difference value between the full liquid level and the empty liquid level of the crystallizer, so that the slag line area is not overlapped in the casting process of different casting times, the technical problem that the copper plate is corroded by the slag line for a long time at the same position to cause the occurrence of transverse crack defect of the steel coil is avoided, meanwhile, the liquid level fluctuation value is obtained by calculation according to the historical data of the crack length of the copper plate and the difference value between the full liquid level and the empty liquid level of the crystallizer, on one hand, the slag line can be prevented from being overlapped, the service life of the copper plate is prolonged, the product quality is improved, on the other hand, the utilization efficiency of the copper plate is improved, and the production cost is reduced.
In some embodiments, the quality assessment criteria are as in table 1:
TABLE 1 quality evaluation criteria Table
Surface condition of copper plate Scoring of
No crack 10
Microcracks (crack depth is less than or equal to 0.3mm, and can be eliminated after polishing) 8
Turtle crack (crack depth is less than or equal to 0.5mm, polishing is difficult to eliminate) 6
Medium crack (crack depth is less than or equal to 1 mm) 4
Severe cracks (crack depth less than or equal to 1.5 mm) 2
Severe cracks (crack depth > 1.5 mm) 0
Note that: if the surface condition of the copper plate is judged to be in between, the intermediate value of the surface condition of the copper plate and the surface condition of the copper plate is scored.
In some embodiments, the level fluctuation value Δh has a value ranging from (Δh min ，Δh max ) The Deltah is min 、Δh max The expressions of (2) are as follows:
wherein θ n The included angle between the nth crack length of the copper plate and the horizontal direction of the crystallizer is expressed, (l) 1 ，l 2 ，...，l n ) Historical data set representing crack length of copper plate, l n Represents the length of the nth crack, and delta S represents the difference between the full liquid level and the empty liquid level of the crystallizer.
The application provides a specific calculation mode of a liquid level fluctuation value, wherein the position of a slag line in the height direction of a crystallizer is estimated through the crack length and the included angle between the horizontal directions of the crystallizer, and the proper liquid level fluctuation value is obtained by combining calculation of the difference value between the full liquid level and the empty liquid level of the crystallizer.
In some embodiments, the crystallizer full level and empty level difference is the absolute value of the difference between the distance of the crystallizer full level from the upper edge of the copper plate and the distance of the crystallizer empty level from the upper edge of the copper plate.
In some embodiments, the copper plate has a crack length ranging from 7-10mm.
The actual production data in the actual production process is obtained through statistics of historical data of the crack length of the copper plate, so that the obtained theoretical result can be better used for actual production and is used for solving the actual technical problem.
In some embodiments, the method further comprises detecting a liquid level in the crystallizer by a liquid level detector, and closing the stopper if the detected value is greater than a set value; if the detection value is smaller than the set value, the stopper is opened.
In order to avoid overlarge deviation between the actual liquid level and the set value, the liquid level detector on the crystallizer detects the liquid level in the crystallizer in real time and reduces the deviation between the detection value and the set value by opening or closing the stopper rod.
In some embodiments, the depth of insertion of the mold submerged entry nozzle is the same in the different runs.
In some embodiments, the insertion depth is 90-110mm.
In some embodiments, copper plate pass threshold δ 0 The value of (2) is 8.
Examples
The present disclosure is more particularly described in the following examples that are intended as illustrations only, since various modifications and changes within the scope of the present disclosure will be apparent to those skilled in the art. Unless otherwise indicated, all parts, percentages, and ratios reported in the examples below are by weight, and all reagents used in the examples are commercially available or were obtained synthetically according to conventional methods and can be used directly without further treatment, as well as the instruments used in the examples.
Example 1
A method for adjusting the liquid level setting of a crystallizer by casting for several times comprises the following steps:
s1: collecting historical data (the value is between 7 and 10 mm) of crack length of a copper plate in a crystallizer and a difference value delta S between full liquid level and empty liquid level of the crystallizer (the absolute value of the difference value between the full liquid level and the empty liquid level of the crystallizer is that the absolute value of the difference between the distance (40 mm) between the full liquid level of the crystallizer and the upper edge of the copper plate and the distance (193.9 mm) between the empty liquid level of the crystallizer and the upper edge of the copper plate, wherein the delta S is 153.9mm in the embodiment), calculating a liquid level fluctuation value delta h, wherein the liquid level fluctuation value delta h is in the range of (delta h) min ，Δh max ) The Deltah is min Has a value of 4.5%, Δh max The value of (2) is 6.5%,
collecting a high-level alarm value 95%, a low-level alarm value 5%, a high-level casting value 85% and a low-level casting value 50% of a crystallizer to obtain a casting liquid level range of 50-85% of the crystallizer;
s2: casting, and setting the initial liquid level value of the first casting time to be 73%; the difference between the liquid level set values of the previous casting time and the next casting time is 7%, and the difference and sum of the liquid level set value and the liquid level fluctuation value delta h of any casting time are all within the casting liquid level range of the crystallizer; when the difference between the liquid level set value of a certain casting time and the double liquid level fluctuation value delta h is smaller than max (a 2 ，b 2 ) Step S3 is carried out;
s3: stopping casting, collecting the surface condition of the copper plate, evaluating the quality of the copper plate based on the crack condition, and judging that the evaluation value delta is more than or equal to delta 0 Returning to the step S2; when delta is less than delta 0 When the casting is stopped, the copper plate is replaced; the delta is 0 The copper plate pass threshold is represented, and the value is 8.
In this embodiment, the method further includes detecting a liquid level in the crystallizer by a liquid level detector, and closing the stopper if the detected value is greater than a set value; if the detection value is smaller than the set value, the stopper is opened.
In this embodiment, the insertion depth of the submerged entry nozzle of the crystallizer is the same in the different casting runs.
In this embodiment, the insertion depth is 110mm.
Comparative example 1: s1: casting, and setting the liquid level value to 73%;
s2: after the single casting is completed, collecting the surface condition of the copper plate, and carrying out quality evaluation delta (the evaluation standard is the same as that of example 1), when delta is more than or equal to delta 0 Returning to the step S1; when delta is less than delta 0 When the casting is stopped, the copper plate is replaced; the delta is 0 The copper plate pass threshold is represented, and the value is 8.
Comparative example 2: s1: casting is performed, the liquid level value is set to 75%, and each casting is performed for 60min, the liquid level value is set to be reduced by 2% (73% → 71% → 69%);
s2: after the single casting is completed, collecting the surface condition of the copper plate, and carrying out quality evaluation delta (the evaluation standard is the same as that of example 1), when delta is more than or equal to delta 0 Returning to the step S1; when delta is less than delta 0 When the casting is stopped, the copper plate is replaced; the delta is 0 The copper plate pass threshold is represented, and the value is 8.
The qualification rate of the steel coil prepared by the methods of example 1, comparative example 1 and comparative example 2 is counted, the service life of a single copper plate is counted, and the result is shown in table 2:
table 2 comparative table of qualification rate of steel coil and service life of copper plate
Project Yield (%) Service life of copper plate (times of casting)
Example 1 99.8 4
Comparative example 1 91.6 2
Comparative example 2 92.5 2
As can be seen from the data of the embodiment 1 and the comparative examples 1-2, compared with the prior art, the technical scheme provided by the application not only prolongs the service life of the copper plate, but also improves the qualification rate of the steel coil, can effectively reduce the production cost and solves the problem that the transverse crack defect occurs in the steel coil in the prior art.
In the above technical solution of the present application, the above is only a preferred embodiment of the present application, and therefore, the patent scope of the present application is not limited thereto, and all the equivalent structural changes made by the content of the present application under the technical concept of the present application, or the direct/indirect application in other related technical fields are included in the patent protection scope of the present application.

Claims (8)

1.一种分浇次调整结晶器液位设定的方法，其特征在于，包括以下步骤：1. A method for adjusting the liquid level setting of the crystallizer by pouring times, which is characterized in that it includes the following steps: S1：采集结晶器内铜板的裂纹长度的历史数据以及结晶器满液位与空液位差值ΔS，计算液位波动值Δh，采集结晶器的高位报警值a1、低位报警值a2、高位浇铸值b1以及低位浇铸值b2，得到结晶器的浇铸液位范围为max(a2，b2)～min(a1，b1)；S1: Collect the historical data of the crack length of the copper plate in the crystallizer and the difference value ΔS between the full liquid level and the empty liquid level of the crystallizer, calculate the liquid level fluctuation value Δh, and collect the high alarm value a 1 and low alarm value a 2 of the crystallizer. Using the high casting value b 1 and the low casting value b 2 , the casting liquid level range of the crystallizer is max(a 2 , b 2 )～min(a 1 , b 1 ); S2：进行浇铸，设定初始液位值；所述浇铸过程中满足前一浇次与后一浇次的液位设定值之差大于液位波动值Δh，且任意浇次的液位设定值与液位波动值Δh的差值与和值均位于结晶器的浇铸液位范围之内；当某一浇次的液位设定值与两倍液位波动值Δh的差值小于max(a2，b2)时，进入步骤S3；S2: Perform casting and set the initial liquid level value; during the casting process, the difference between the liquid level setting values of the previous pouring time and the next pouring time is greater than the liquid level fluctuation value Δh, and the liquid level setting value of any pouring time is satisfied. The difference and sum of the fixed value and the liquid level fluctuation value Δh are both within the casting liquid level range of the crystallizer; when the difference between the liquid level set value for a certain casting and twice the liquid level fluctuation value Δh is less than max (a 2 , b 2 ), enter step S3; S3：停浇，采集铜板表面状况，基于裂缝情况对所述铜板进行质量评价，当评价值δ≥δ0时，返回步骤S2；当δ＜δ0时，停止浇铸，进行铜板更换；所述δ0表示铜板合格阈值。S3: Stop pouring, collect the surface condition of the copper plate, and evaluate the quality of the copper plate based on the crack situation. When the evaluation value δ ≥ δ 0 , return to step S2; when δ < δ 0 , stop pouring and replace the copper plate; as described δ 0 represents the copper plate qualification threshold. 2.根据权利要求1所述的方法，其特征在于，所述液位波动值Δh的取值范围为(Δhmin，Δhmax)，所述Δhmin、Δhmax的表达式分别如下：2. The method according to claim 1, characterized in that the range of the liquid level fluctuation value Δh is (Δh min , Δh max ), and the expressions of the Δh min and Δh max are as follows: 其中，θ表示铜板的第n条裂纹长度与结晶器水平方向之间的夹角，(l1，l2，...，ln)表示铜板的裂纹长度的历史数据集合，ln表示第n条裂纹长度，ΔS表示结晶器满液位与空液位差值。Among them, θ represents the angle between the nth crack length of the copper plate and the horizontal direction of the crystallizer, (l 1 , l 2 ,..., l n ) represents the historical data set of the crack length of the copper plate, and l n represents the crack length of the copper plate. The length of n cracks, ΔS represents the difference between the full liquid level and the empty liquid level of the crystallizer. 3.根据权利要求2所述的方法，其特征在于，所述结晶器满液位与空液位差值即结晶器满液位距铜板上沿的距离与结晶器空液位距铜板上沿的距离之差的绝对值。3. The method according to claim 2, characterized in that the difference between the full liquid level and the empty liquid level of the crystallizer is the distance between the full liquid level of the crystallizer and the upper edge of the copper plate and the distance between the empty liquid level of the crystallizer and the upper edge of the copper plate. The absolute value of the distance difference. 4.根据权利要求1所述的方法，其特征在于，所述铜板的裂纹长度的取值范围为7-10mm。4. The method according to claim 1, characterized in that the crack length of the copper plate ranges from 7 to 10 mm. 5.根据权利要求1所述的方法，其特征在于，还包括通过液位检测器检测结晶器中的液位，若检测值大于设定值，则关闭塞棒；若检测值小于设定值，则打开塞棒。5. The method according to claim 1, further comprising detecting the liquid level in the crystallizer through a liquid level detector, and if the detected value is greater than the set value, closing the stopper; if the detected value is less than the set value , then open the stopper. 6.根据权利要求1所述的方法，其特征在于，所述不同浇次中结晶器浸入式水口的插入深度相同。6. The method according to claim 1, characterized in that the insertion depth of the immersed nozzle of the crystallizer in the different pouring times is the same. 7.根据权利要求6所述的方法，其特征在于，所述插入深度为90-110mm。7. The method according to claim 6, characterized in that the insertion depth is 90-110 mm. 8.根据权利要求1所述的方法，其特征在于，铜板合格阈值δ0的取值为8。8. The method according to claim 1, characterized in that the value of the copper plate qualification threshold δ 0 is 8.
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