CN114918395B - Setting method of cooling water flow of crystallizer - Google Patents
Setting method of cooling water flow of crystallizer Download PDFInfo
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- CN114918395B CN114918395B CN202210429844.2A CN202210429844A CN114918395B CN 114918395 B CN114918395 B CN 114918395B CN 202210429844 A CN202210429844 A CN 202210429844A CN 114918395 B CN114918395 B CN 114918395B
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- 239000000498 cooling water Substances 0.000 title claims abstract description 90
- 238000000034 method Methods 0.000 title claims abstract description 32
- RYGMFSIKBFXOCR-UHFFFAOYSA-N Copper Chemical compound [Cu] RYGMFSIKBFXOCR-UHFFFAOYSA-N 0.000 claims abstract description 67
- 229910052802 copper Inorganic materials 0.000 claims abstract description 67
- 239000010949 copper Substances 0.000 claims abstract description 67
- 238000005266 casting Methods 0.000 claims abstract description 34
- 238000009749 continuous casting Methods 0.000 claims abstract description 15
- 238000012545 processing Methods 0.000 claims abstract description 14
- 235000006506 Brasenia schreberi Nutrition 0.000 claims description 4
- 238000009966 trimming Methods 0.000 claims 1
- 229910000831 Steel Inorganic materials 0.000 abstract description 14
- 239000010959 steel Substances 0.000 abstract description 14
- 238000001816 cooling Methods 0.000 abstract description 8
- 238000007711 solidification Methods 0.000 abstract description 7
- 230000008023 solidification Effects 0.000 abstract description 7
- 238000010586 diagram Methods 0.000 description 6
- 238000012546 transfer Methods 0.000 description 3
- 239000003795 chemical substances by application Substances 0.000 description 2
- 238000005336 cracking Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000004519 manufacturing process Methods 0.000 description 2
- 238000005096 rolling process Methods 0.000 description 2
- 230000008646 thermal stress Effects 0.000 description 2
- 238000001931 thermography Methods 0.000 description 2
- XLYOFNOQVPJJNP-UHFFFAOYSA-N water Substances O XLYOFNOQVPJJNP-UHFFFAOYSA-N 0.000 description 2
- 230000002159 abnormal effect Effects 0.000 description 1
- 230000006978 adaptation Effects 0.000 description 1
- 229910052799 carbon Inorganic materials 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 238000012544 monitoring process Methods 0.000 description 1
- 239000000843 powder Substances 0.000 description 1
- 230000000750 progressive 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
- B22D11/00—Continuous casting of metals, i.e. casting in indefinite lengths
- B22D11/16—Controlling or regulating processes or operations
- B22D11/22—Controlling or regulating processes or operations for cooling cast stock or mould
-
- 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
- B22D11/055—Cooling the 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
The embodiment of the application provides a setting method of cooling water flow of a crystallizer, which comprises the following steps: after the crystallizer copper plate is subjected to offline grinding processing, obtaining the initial thickness of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used; acquiring a casting pulling rate, and determining that the corresponding cooling water flow of the crystallizer is the initial cooling water flow according to the casting pulling rate; acquiring the actual thickness of the crystallizer copper plate after grinding processing, and determining the thickness thinning amount based on the initial thickness and the actual thickness; and resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the initial cooling water flow. The technical scheme provided by the application can reduce the influence of the thinning of the crystallizer copper plate on the cooling and initial solidification of molten steel at least to a certain extent, and finally ensures smooth continuous casting and improves the product quality.
Description
Technical Field
The application relates to the technical field of casting, in particular to a setting method of cooling water flow of a crystallizer.
Background
In continuous casting production, the working surface of a crystallizer copper plate is contacted with molten steel at 1530-1570 ℃ through casting powder, and the back surface of the copper plate is passed through cooling water at 30-40 ℃, so that a great temperature gradient and thermal stress exist in the crystallizer, and the operation reliability of the crystallizer directly influences the quality of casting blanks and the continuous casting productivity. The crystallizer copper plate needs to be subjected to offline grinding after being cast for a certain number of furnaces, so that the thickness of the copper plate is thinned, and the thinning of the copper plate can influence the heat transfer of molten steel. In the traditional production, after the offline grinding, casting is still carried out in a mode that the flow rate and the flow velocity of cold water are kept unchanged, the influence of the thickness of the copper plate on heat transfer is not considered, the cooling and the initial solidification of molten steel are influenced,
Therefore, a setting method of cooling water flow of a crystallizer is urgently needed by those skilled in the art, so that the influence of thinning of a copper plate of the crystallizer on cooling and initial solidification of molten steel is reduced, smooth continuous casting is finally ensured, and the product quality is improved.
Disclosure of Invention
The embodiment of the application provides a setting method of cooling water flow of a crystallizer, which can further reduce the influence of thinning of a copper plate of the crystallizer on cooling and initial solidification of molten steel at least to a certain extent, thereby ensuring smooth continuous casting and improving the product quality.
Other features and advantages of the application will be apparent from the following detailed description, or may be learned by the practice of the application.
According to one aspect of the present application, there is provided a method for setting a flow rate of cooling water of a crystallizer, the method comprising: after the crystallizer copper plate is subjected to offline grinding processing, obtaining the initial thickness of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used; acquiring a casting pulling rate, and determining that the corresponding cooling water flow of the crystallizer is the initial cooling water flow according to the casting pulling rate; acquiring the actual thickness of the crystallizer copper plate after grinding processing, and determining the thickness thinning amount based on the initial thickness and the actual thickness; and resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the initial cooling water flow.
In some embodiments of the application, prior to the crystallizer copper plate offline grinding process, the method further comprises: and obtaining the number of continuous casting furnaces, and if the number of continuous casting furnaces is larger than or equal to the preset number of furnaces, performing grinding processing on the crystallizer copper plate after casting of the current number of furnaces is completed.
In some embodiments of the application, the predetermined number of ovens is 80 to 120 ovens.
In some embodiments of the application, said determining an amount of thickness reduction based on said initial thickness and said actual thickness comprises: the thickness reduction was calculated according to the following formula:
x＝X0-Xt
Wherein X is the thickness reduction amount, X 0 is the initial thickness, and X t is the actual thickness.
In some embodiments of the present application, the resetting the cooling water flow rate of the crystallizer according to the thickness reduction amount and the cooling water initial flow rate includes: calculating a flow rate decrease ratio with respect to the initial flow rate of the cooling water based on the thickness reduction amount; and calculating a target flow rate of the cooling water based on the initial flow rate of the cooling water and the flow rate reduction ratio so as to reset the cooling water flow rate of the crystallizer.
In some embodiments of the application, the calculating a flow rate decrease ratio with respect to the initial flow rate of the cooling water based on the thickness reduction amount includes: calculating the flow rate reduction ratio relative to the initial flow rate of the cooling water according to the following formula:
y＝(ax2+bx+c)×100％
Wherein y is the flow rate reduction ratio, x is the thickness reduction amount, -0.006 is less than or equal to a and less than or equal to-0.004, -0.05 is less than or equal to 0.06,0 is less than or equal to c and less than or equal to 0.0001.
In some embodiments of the application, the calculating a flow rate decrease ratio with respect to the initial flow rate of the cooling water based on the thickness reduction amount includes: calculating the flow rate reduction ratio relative to the initial flow rate of the cooling water according to the following formula:
y＝(-0.005x2+0.054x+0.0001)×100％
Wherein y is the flow rate reduction ratio, and x is the thickness reduction amount.
In some embodiments of the application, the calculating the cooling water target flow rate based on the cooling water initial flow rate and the flow rate decrease ratio includes:
LS＝L0(1-y)
Wherein, L S is the target flow of the cooling water, L 0 is the initial flow of the cooling water, and y is the flow reduction ratio.
According to one aspect of the present application, there is provided a setting device for a flow rate of cooling water of a crystallizer, the setting device comprising: the first acquisition unit is used for acquiring the initial thickness of the crystallizer copper plate after the offline grinding processing of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used; the second acquisition unit is used for acquiring casting pulling speed, and determining that the corresponding crystallizer cooling water flow is the initial cooling water flow according to the casting pulling speed; a third acquisition unit for acquiring an actual thickness of the crystallizer copper plate after grinding processing, and determining a thickness reduction amount based on the initial thickness and the actual thickness; and the setting unit is used for resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the initial cooling water flow.
Based on the scheme, the application has at least the following advantages or progressive effects:
The setting method of the cooling water flow of the crystallizer provided by the application can determine the cooling water flow after thinning the copper plate according to the thickness thinning amount of the copper plate, ensure that the crystallizer has relatively proper cooling on molten steel, and simultaneously avoid cracking of the copper plate of the crystallizer caused by overlarge cooling water flow, thereby reducing the influence of the thinning of the copper plate of the crystallizer on cooling and initial solidification of the molten steel, and finally ensuring smooth continuous casting and improving the quality of products.
It is to be understood that both the foregoing general description and the following detailed description are exemplary and explanatory only and are not restrictive of the application as claimed.
Drawings
The accompanying drawings, which are incorporated in and constitute a part of this specification, illustrate embodiments consistent with the application and together with the description, serve to explain the principles of the application. It is evident that the drawings in the following description are only some embodiments of the present application and that other drawings may be obtained from these drawings without inventive effort for a person of ordinary skill in the art. In the drawings:
FIG. 1 shows a flow diagram of a method for setting the flow rate of cooling water to a crystallizer in one embodiment of the application;
FIG. 2 shows a flow diagram of a method for setting the flow rate of cooling water to a crystallizer in one embodiment of the application;
fig. 3 shows a setting device of the crystallizer cooling water flow in an embodiment of the application.
Detailed Description
Example embodiments will now be described more fully with reference to the accompanying drawings. However, the exemplary embodiments may be embodied in many forms and should not be construed as limited to the examples set forth herein; rather, these embodiments are provided so that this disclosure will be thorough and complete, and will fully convey the concept of the example embodiments to those skilled in the art.
Furthermore, the described features, structures, or characteristics may be combined in any suitable manner in one or more embodiments. In the following description, numerous specific details are provided to give a thorough understanding of embodiments of the application. One skilled in the relevant art will recognize, however, that the application may be practiced without one or more of the specific details, or with other methods, components, devices, steps, etc. In other instances, well-known methods, devices, implementations, or operations are not shown or described in detail to avoid obscuring aspects of the application.
The block diagrams depicted in the figures are merely functional entities and do not necessarily correspond to physically separate entities. That is, the functional entities may be implemented in software, or in one or more hardware modules or integrated circuits, or in different networks and/or processor devices and/or microcontroller devices.
The flow diagrams depicted in the figures are exemplary only, and do not necessarily include all of the elements and operations/steps, nor must they be performed in the order described. For example, some operations/steps may be decomposed, and some operations/steps may be combined or partially combined, so that the order of actual execution may be changed according to actual situations.
It should be noted that the terms "first," "second," and the like in the description and claims of the present application and in the above-described figures are used for distinguishing between similar objects and not necessarily for describing a particular sequential or chronological order. It is to be understood that the objects so used may be interchanged where appropriate such that the embodiments of the application described herein may be implemented in other sequences than those illustrated or otherwise described.
Referring to fig. 1, fig. 1 shows a flow diagram of a method for setting a flow rate of cooling water of a crystallizer in an embodiment of the present application, which may include steps S101 to S104:
Step S101, after the crystallizer copper plate is subjected to offline grinding processing, obtaining the initial thickness of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used.
Step S102, obtaining a casting pulling speed, and determining that the corresponding cooling water flow of the crystallizer is the initial cooling water flow according to the casting pulling speed.
And step S103, obtaining the actual thickness of the crystallizer copper plate after grinding processing, and determining the thickness reduction amount based on the initial thickness and the actual thickness.
And step S104, resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the initial cooling water flow.
According to the application, the cooling water flow of the crystallizer can be correspondingly reset by calculating the thickness thinning amount of the crystallizer copper plate, so that the influence of cooling effect brought by thinning of the crystallizer copper plate is avoided, the heat difference at two sides of the crystallizer copper plate can be stabilized, the cracking probability of the crystallizer copper plate is reduced, the influence of thinning of the crystallizer copper plate on cooling and initial solidification of molten steel is reduced, and smooth continuous casting is finally ensured, and the product quality is improved.
In one embodiment of the present application, before the crystallizer copper plate offline grinding process, the method may further include: and obtaining the number of continuous casting furnaces, and if the number of continuous casting furnaces is larger than or equal to the preset number of furnaces, performing grinding processing on the crystallizer copper plate after casting of the current number of furnaces is completed.
In the present application, the predetermined number of furnaces may be 80 to 120 furnaces.
In the application, because the temperature of molten steel is extremely high, the generated thermal stress induces the elastic and plastic deformation, high-temperature creep deformation and the like of the crystallizer copper plate, and the heat transfer uniformity and stability are still obviously restricted although the deformation is relatively small, so that the casting operation and the casting blank quality are influenced. Therefore, after the number of casting furnaces reaches a certain number, the crystallizer steel plate is ground and thinned, the flatness is restored, and the influence on the quality of casting blanks is reduced.
For example, after casting 100 furnaces, casting in the next furnace may be stopped, and the crystallizer steel plate may be subjected to a leveling and thinning process and then cast in the next furnace.
In one embodiment of the present application, the method of determining the thickness reduction amount based on the initial thickness and the actual thickness may calculate the thickness reduction amount according to the following formula:
x＝X0-Xt
Wherein X is the thickness reduction amount, X 0 is the initial thickness, and X t is the actual thickness.
Referring to fig. 2, fig. 2 is a schematic flow chart of a method for setting cooling water flow rate of a crystallizer according to an embodiment of the present application, where the method for resetting cooling water flow rate of the crystallizer according to the thickness reduction amount and the cooling water initial flow rate may include steps S201 to S202:
step S201, calculating a flow rate decrease ratio with respect to the initial flow rate of the cooling water based on the thickness reduction amount.
Step S202, calculating a cooling water target flow based on the cooling water initial flow and the flow reduction ratio so as to reset the cooling water flow of the crystallizer.
In this embodiment, the flow rate decrease ratio with respect to the initial flow rate of the cooling water may be calculated according to the following formula:
y＝(ax2+bx+c)×100％
Wherein y is the flow rate reduction ratio, x is the thickness reduction amount, -0.006 is less than or equal to a and less than or equal to-0.004, -0.05 is less than or equal to 0.06,0 is less than or equal to c and less than or equal to 0.0001.
In this embodiment, the flow rate decrease ratio with respect to the initial flow rate of the cooling water may be calculated according to the following formula:
y＝(-0.005x2+0.054x+0.0001)×100％
Wherein y is the flow rate reduction ratio, and x is the thickness reduction amount.
In the application, when the thickness of the crystallizer copper plate is reduced, the cooling water flow rate reduction ratio of the crystallizer and the thickness reduction amount of the crystallizer copper plate can be in a quadratic relation:
y＝(-0.005x2+0.054x+0.0001)×100％
Table 1 shows the relationship between the thickness of the copper plate of different crystallizers and the water flow rate at the casting pulling rate of 5.4 m/min.
TABLE 1
In one embodiment of the present application, the method for calculating a target flow rate of cooling water based on the initial flow rate and the flow rate decrease ratio may include: the cooling water target flow rate may be calculated according to the following formula:
LS＝L0(1-y)
Wherein, L S is the target flow of the cooling water, L 0 is the initial flow of the cooling water, and y is the flow reduction ratio.
In order that those skilled in the art will appreciate a more complete understanding of the present application, a description of the present application will be provided with reference to one complete embodiment.
Table 2 shows the correspondence between the casting pull rate and the flow rate of cooling water in the mold according to the present application.
| Casting pulling speed m/min | Crystallizer cooling water flow L/min |
| ＜2.5 | 7000 |
| 2.5-3.5 | 7200 |
| 3.5-4.5 | 7350 |
| 4.5-5.5 | 8500 |
| ＞5.5 | 8580 |
TABLE 2
A multi-mode full continuous casting and rolling machine single block rolling mode is adopted to produce low-carbon Q235B steel, the section is 1250mm multiplied by 110mm, a 22-furnace continuous casting is adopted, the target maximum pulling speed is 5.4m/min, the adding amount of a casting covering agent is 800kg, the superheat degree is controlled to be 20-35 ℃, 200kg of covering agent is added to each furnace, the thickness of a crystallizer copper plate is checked to be 42.5mm before casting, the initial thickness of the crystallizer copper plate is 45mm, the thickness of the crystallizer copper plate is reduced by 2.5mm, and the initial flow of cooling water is determined to be 8500L/min according to the target maximum pulling speed.
According to the formula: y= (-0.005 x 2+0.054x2 + 0.0001) x 100%, and the flow rate reduction ratio is calculated to be 10.4%, and the target flow rate of the cooling water is calculated to be 7259L/min. And the thermal imaging monitoring is carried out on the crystallizer, and the fact that the thermal imaging diagram of the crystallizer is not abnormal is found, the casting process is stable, and the casting blank quality is good.
The technical scheme provided by the application can obviously improve the initial solidification of molten steel to achieve a good effect under the condition of different thickness changes of the crystallizer copper plate. The method is simple and easy to operate, and meanwhile, the product quality is ensured to be stable.
Next, an embodiment of a device of the present application will be described with reference to the drawings.
Referring to fig. 3, fig. 3 illustrates a setting device for a flow rate of cooling water of a mold in an embodiment of the present application, the setting device 300 may include: a first acquisition unit 301, a second acquisition unit 302, a third acquisition unit 303, and a setting unit 304.
The specific configuration of the setting device 300 may include: a first obtaining unit 301, configured to obtain an initial thickness of the copper plate after the copper plate is offline and polished, where the initial thickness is used to characterize a thickness of the copper plate when the copper plate is not in use; the second obtaining unit 302 may be configured to obtain a casting pull rate, and determine, according to the casting pull rate, a corresponding cooling water flow rate of the crystallizer as an initial cooling water flow rate; a third obtaining unit 304 that may be used to obtain an actual thickness of the crystallizer copper plate after grinding, and determine a thickness reduction amount based on the initial thickness and the actual thickness; the setting unit 305 may be used to reset the cooling water flow rate of the crystallizer according to the thickness reduction amount and the cooling water initial flow rate.
Other embodiments of the application will be apparent to those skilled in the art from consideration of the specification and practice of the embodiments disclosed herein. This application is intended to cover any variations, uses, or adaptations of the application following, in general, the principles of the application and including such departures from the present disclosure as come within known or customary practice within the art to which the application pertains.
It is to be understood that the application is not limited to the precise arrangements and instrumentalities shown in the drawings, which have been described above, and that various modifications and changes may be effected without departing from the scope thereof. The scope of the application is limited only by the appended claims.
Claims (5)
1. A method for setting cooling water flow of a crystallizer, the method comprising:
after the crystallizer copper plate is subjected to offline grinding processing, obtaining the initial thickness of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used;
acquiring a casting pulling rate, and determining that the corresponding cooling water flow of the crystallizer is the initial cooling water flow according to the casting pulling rate;
obtaining the actual thickness of the crystallizer copper plate after grinding, determining the thickness reduction based on the initial thickness and the actual thickness, and calculating the thickness reduction according to the following formula:
Wherein is the thickness reduction, v > is the initial thickness, v > is the actual thickness;
Resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the cooling water initial flow, calculating a flow reduction ratio relative to the cooling water initial flow based on the thickness reduction amount, and calculating the flow reduction ratio relative to the cooling water initial flow according to the following formula:
wherein is the flow rate reduction ratio, and/() is the thickness reduction amount, -0.006- ≤-0.004,-0.05≤/>≤0.06,0＜/> -0.0001;
calculating a cooling water target flow rate based on the cooling water initial flow rate and the flow rate reduction ratio:
Wherein is the target flow rate of the cooling water,/> is the initial flow rate of the cooling water, and/> is the flow rate reduction ratio to reset the cooling water flow rate of the crystallizer.
2. The method of claim 1, wherein prior to the off-line trimming process of the crystallizer copper plate, the method further comprises:
and obtaining the number of continuous casting furnaces, and if the number of continuous casting furnaces is larger than or equal to the preset number of furnaces, performing grinding processing on the crystallizer copper plate after casting of the current number of furnaces is completed.
3. The method of claim 2, wherein the predetermined number of ovens is 80 to 120 ovens.
4. The method according to claim 1, wherein the calculating a flow rate decrease ratio with respect to the initial flow rate of the cooling water based on the thickness reduction amount includes:
calculating the flow rate reduction ratio relative to the initial flow rate of the cooling water according to the following formula:
Wherein is the flow rate decrease ratio, and/() is the thickness reduction amount.
5. A setting device for a flow of cooling water of a mold, for a setting method of a flow of cooling water of a mold according to any one of claims 1 to 4, characterized in that the setting device comprises:
the first acquisition unit is used for acquiring the initial thickness of the crystallizer copper plate after the offline grinding processing of the crystallizer copper plate, wherein the initial thickness is used for representing the thickness of the crystallizer copper plate when the crystallizer copper plate is not used;
the second acquisition unit is used for acquiring casting pulling speed, and determining that the corresponding crystallizer cooling water flow is the initial cooling water flow according to the casting pulling speed;
A third acquisition unit for acquiring an actual thickness of the crystallizer copper plate after grinding processing, and determining a thickness reduction amount based on the initial thickness and the actual thickness;
and the setting unit is used for resetting the cooling water flow of the crystallizer according to the thickness reduction amount and the initial cooling water flow.
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| CN107891132A (en) * | 2017-10-26 | 2018-04-10 | 首钢京唐钢铁联合有限责任公司 | Continuous casting method for sub-peritectic steel slab |
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